#
#  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#

import asyncio
import base64
import copy
import hashlib
import hmac
import inspect
import ipaddress
import json
import logging
import time
from functools import partial, wraps
from typing import Set

from api.utils.web_utils import CONTENT_TYPE_MAP, apply_safe_file_response_headers
import jwt
from quart import Response, jsonify, request, make_response

from api.apps import current_user, login_required
from api.apps.services.canvas_replica_service import CanvasReplicaService
from api.db import CanvasCategory
from api.db.db_models import Task
from api.db.services.api_service import API4ConversationService
from api.db.services.canvas_service import (
    CanvasTemplateService,
    UserCanvasService,
    completion as agent_completion,
    completion_openai,
)
from api.db.services.document_service import DocumentService
from api.db.services.file_service import FileService
from api.db.services.knowledgebase_service import KnowledgebaseService
from api.db.services.pipeline_operation_log_service import PipelineOperationLogService
from api.db.services.task_service import CANVAS_DEBUG_DOC_ID, TaskService, queue_dataflow
from api.db.services.user_service import TenantService, UserService
from api.db.services.user_canvas_version import UserCanvasVersionService
from api.utils.api_utils import (
    add_tenant_id_to_kwargs,
    check_duplicate_ids,
    get_data_error_result,
    get_error_data_result,
    get_json_result,
    get_result,
    get_request_json,
    server_error_response,
    validate_request,
)
from api.utils.pagination_utils import validate_rest_api_page_size
from common import settings
from common.ssrf_guard import assert_host_is_safe
from common.constants import RetCode
from common.misc_utils import get_uuid, thread_pool_exec
from peewee import MySQLDatabase, PostgresqlDatabase

# Keeps strong references to fire-and-forget tasks so they are not GC'd before completion.
_background_tasks: Set[asyncio.Task] = set()


def _require_canvas_access_sync(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        if not UserCanvasService.accessible(kwargs.get('agent_id'), kwargs.get('tenant_id')):
            return get_json_result(data=False, message="Make sure you have permission to access the agent.", code=RetCode.OPERATING_ERROR)
        return func(*args, **kwargs)
    return wrapper


def _require_canvas_access_async(func):
    @wraps(func)
    async def wrapper(*args, **kwargs):
        agent_id = kwargs.get('agent_id')
        tenant_id = kwargs.get('tenant_id')
        if not await thread_pool_exec(UserCanvasService.accessible, agent_id, tenant_id):
            return get_json_result(data=False, message="Make sure you have permission to access the agent.", code=RetCode.OPERATING_ERROR)
        return await func(*args, **kwargs)
    return wrapper


def _require_canvas_owner_sync(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        if not UserCanvasService.query(user_id=kwargs.get('tenant_id'), id=kwargs.get('agent_id')):
            return get_json_result(data=False, message="Only the owner of the agent is authorized for this operation.", code=RetCode.OPERATING_ERROR)
        return func(*args, **kwargs)
    return wrapper


def _get_user_nickname(user_id: str) -> str:
    exists, user = UserService.get_by_id(user_id)
    if not exists:
        return user_id
    return str(getattr(user, "nickname", "") or user_id)


def _build_sse_response(body):
    resp = Response(body, mimetype="text/event-stream")
    resp.headers.add_header("Cache-control", "no-cache")
    resp.headers.add_header("Connection", "keep-alive")
    resp.headers.add_header("X-Accel-Buffering", "no")
    resp.headers.add_header("Content-Type", "text/event-stream; charset=utf-8")
    return resp


def _normalize_agent_reference_entry(reference):
    if not isinstance(reference, dict):
        return {"chunks": [], "doc_aggs": []}
    if "chunks" in reference or "doc_aggs" in reference:
        return {
            "chunks": reference.get("chunks", []),
            "doc_aggs": reference.get("doc_aggs", []),
        }
    return {
        "chunks": reference.get("reference", reference.get("chunks", [])) or [],
        "doc_aggs": reference.get("doc_aggs", []) or [],
    }


def _normalize_agent_reference_chunk(chunk):
    if not isinstance(chunk, dict):
        return {
            "id": chunk,
            "content": str(chunk),
            "document_id": None,
            "document_name": None,
            "dataset_id": None,
            "image_id": None,
            "positions": None,
        }

    return {
        "id": chunk.get("chunk_id", chunk.get("id")),
        "content": chunk.get("content_with_weight", chunk.get("content")),
        "document_id": chunk.get("doc_id", chunk.get("document_id")),
        "document_name": chunk.get("docnm_kwd", chunk.get("document_name")),
        "dataset_id": chunk.get("kb_id", chunk.get("dataset_id")),
        "image_id": chunk.get("image_id", chunk.get("img_id")),
        "positions": chunk.get("positions", chunk.get("position_int")),
    }


def _normalize_agent_session(conv):
    conv["message"] = conv.get("message", [])
    for info in conv["message"]:
        if "prompt" in info:
            info.pop("prompt")
    conv["agent_id"] = conv.pop("dialog_id")
    if isinstance(conv["reference"], dict):
        if "chunks" in conv["reference"]:
            conv["reference"] = [conv["reference"]]
        else:
            conv["reference"] = [value for _, value in sorted(conv["reference"].items(), key=lambda item: int(item[0]))]
    elif isinstance(conv["reference"], list):
        conv["reference"] = [_normalize_agent_reference_entry(reference) for reference in conv["reference"]]
    else:
        conv["reference"] = []

    if conv["reference"]:
        messages = [message for i, message in enumerate(conv["message"]) if i != 0 and message["role"] != "user"]
        for message, reference in zip(messages, conv["reference"]):
            chunks = reference.get("chunks", [])
            if isinstance(chunks, dict):
                refs = []
                for citation_id, chunk in chunks.items():
                    ref = _normalize_agent_reference_chunk(chunk)
                    ref["citation_id"] = str(citation_id)
                    refs.append(ref)
                message["reference"] = refs
            elif isinstance(chunks, list):
                message["reference"] = [_normalize_agent_reference_chunk(chunk) for chunk in chunks]
            else:
                message["reference"] = []
    del conv["reference"]
    return conv


def _agent_session_list_result(data, total):
    return jsonify({"code": RetCode.SUCCESS, "message": "success", "data": data, "total": total})


async def _run_workflow_session(
    tenant_id,
    agent_id,
    workflow_conv,
    canvas,
    query,
    files,
    inputs,
    user_id,
    session_id,
    custom_header,
    canvas_title,
    canvas_category,
    return_trace,
    stream,
    chat_template_kwargs=None,
):
    async def commit_runtime_replica():
        commit_ok = CanvasReplicaService.commit_after_run(
            canvas_id=agent_id,
            tenant_id=str(tenant_id),
            runtime_user_id=user_id,
            dsl=json.loads(str(canvas)),
            canvas_category=canvas_category,
            title=canvas_title,
        )
        if not commit_ok:
            logging.error(
                "Canvas runtime replica commit failed: canvas_id=%s tenant_id=%s runtime_user_id=%s",
                agent_id,
                tenant_id,
                user_id,
            )

    workflow_conv.setdefault("message", [])
    if isinstance(workflow_conv.get("reference"), dict):
        if "chunks" in workflow_conv["reference"]:
            workflow_conv["reference"] = [workflow_conv["reference"]]
        else:
            workflow_conv["reference"] = [
                value for _, value in sorted(workflow_conv["reference"].items(), key=lambda item: int(item[0]))
            ]
    elif not isinstance(workflow_conv.get("reference"), list):
        workflow_conv["reference"] = []
    workflow_conv["reference"] = [_normalize_agent_reference_entry(reference) for reference in workflow_conv["reference"]]

    turn_id = workflow_conv["message"][-1].get("id") if workflow_conv["message"] else get_uuid()
    full_content = ""
    reference = {}
    final_ans = {}
    trace_items = []
    structured_output = {}
    run_kwargs = {
        "query": query,
        "files": files,
        "user_id": user_id,
        "inputs": inputs,
    }
    if chat_template_kwargs is not None:
        run_kwargs["chat_template_kwargs"] = chat_template_kwargs

    async def persist_workflow_session():
        if not final_ans:
            return
        workflow_conv["message"].append(
            {
                "role": "assistant",
                "content": full_content,
                "created_at": time.time(),
                "id": turn_id,
            }
        )
        workflow_conv["reference"].append(_normalize_agent_reference_entry(reference))
        workflow_conv["dsl"] = json.loads(str(canvas))
        workflow_conv["source"] = workflow_conv.get("source") or "workflow"
        await thread_pool_exec(API4ConversationService.append_message, session_id, workflow_conv)
        await commit_runtime_replica()

    if stream:

        async def sse():
            nonlocal full_content, reference, final_ans, trace_items, structured_output
            done_sent = False
            try:
                async for ans in canvas.run(**run_kwargs):
                    ans["session_id"] = session_id
                    if ans.get("event") == "message":
                        full_content += ans.get("data", {}).get("content", "")
                    if ans.get("data", {}).get("reference", None):
                        reference.update(ans["data"]["reference"])
                    if ans.get("event") == "node_finished":
                        data = ans.get("data", {})
                        node_out = data.get("outputs", {})
                        component_id = data.get("component_id")
                        if component_id is not None and "structured" in node_out:
                            structured_output[component_id] = copy.deepcopy(node_out["structured"])
                        if return_trace:
                            trace_items.append(
                                {
                                    "component_id": data.get("component_id"),
                                    "trace": [copy.deepcopy(data)],
                                }
                            )
                    final_ans = ans
                    yield "data:" + json.dumps(ans, ensure_ascii=False) + "\n\n"

                if final_ans:
                    if "data" not in final_ans or not isinstance(final_ans["data"], dict):
                        final_ans["data"] = {}
                    final_ans["data"]["content"] = full_content
                    final_ans["data"]["reference"] = reference
                    if structured_output:
                        final_ans["data"]["structured"] = structured_output
                    if trace_items:
                        final_ans["data"]["trace"] = trace_items
                await persist_workflow_session()
            except Exception as exc:
                logging.exception(exc)
                canvas.cancel_task()
                yield (
                    "data:"
                    + json.dumps({"code": 500, "message": str(exc), "data": False}, ensure_ascii=False)
                    + "\n\n"
                )
            finally:
                if not done_sent:
                    done_sent = True
                    yield "data:[DONE]\n\n"

        return _build_sse_response(sse())

    try:
        async for ans in canvas.run(**run_kwargs):
            ans["session_id"] = session_id
            if ans.get("event") == "message":
                full_content += ans.get("data", {}).get("content", "")
            if ans.get("data", {}).get("reference", None):
                reference.update(ans["data"]["reference"])
            if ans.get("event") == "node_finished":
                data = ans.get("data", {})
                node_out = data.get("outputs", {})
                component_id = data.get("component_id")
                if component_id is not None and "structured" in node_out:
                    structured_output[component_id] = copy.deepcopy(node_out["structured"])
                if return_trace:
                    trace_items.append(
                        {
                            "component_id": data.get("component_id"),
                            "trace": [copy.deepcopy(data)],
                        }
                    )
            final_ans = ans
    except Exception as exc:
        logging.exception(exc)
        canvas.cancel_task()
        return get_result(data=f"**ERROR**: {str(exc)}")

    if not final_ans:
        await commit_runtime_replica()
        return get_result(data={})

    if "data" not in final_ans or not isinstance(final_ans["data"], dict):
        final_ans["data"] = {}
    final_ans["data"]["content"] = full_content
    final_ans["data"]["reference"] = reference
    if structured_output:
        final_ans["data"]["structured"] = structured_output
    if trace_items:
        final_ans["data"]["trace"] = trace_items

    await persist_workflow_session()
    return get_result(data=final_ans)


@manager.route("/agents/<agent_id>/sessions", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_sync
def list_agent_sessions(agent_id, tenant_id):
    session_id = request.args.get("id")
    user_id = request.args.get("user_id")
    page_number = int(request.args.get("page", 1))
    items_per_page = validate_rest_api_page_size(int(request.args.get("page_size", 30)))
    keywords = request.args.get("keywords")
    from_date = request.args.get("from_date")
    to_date = request.args.get("to_date")
    orderby = request.args.get("orderby", "update_time")
    exp_user_id = request.args.get("exp_user_id")
    desc = request.args.get("desc") not in {"False", "false"}

    if exp_user_id:
        sessions = API4ConversationService.get_names(agent_id, exp_user_id)
        return _agent_session_list_result(sessions, len(sessions))

    include_dsl = request.args.get("dsl") not in {"False", "false"}
    total, sessions = API4ConversationService.get_list(
        agent_id,
        tenant_id,
        page_number,
        items_per_page,
        orderby,
        desc,
        session_id,
        user_id,
        include_dsl,
        keywords,
        from_date,
        to_date,
        exp_user_id=exp_user_id,
    )
    sessions = [_normalize_agent_session(session) for session in sessions]
    return _agent_session_list_result(sessions, total)


@manager.route("/agents/<agent_id>/sessions", methods=["POST"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_async
async def create_agent_session(agent_id, tenant_id):
    from agent.canvas import Canvas

    req = await get_request_json()
    user_id = req.get("user_id") or request.args.get("user_id", tenant_id)
    release_mode = bool(req.get("release", request.args.get("release", False)))

    try:
        cvs, dsl = UserCanvasService.get_agent_dsl_with_release(agent_id, release_mode, tenant_id)
    except LookupError:
        return get_data_error_result(message="Agent not found.")
    except PermissionError as e:
        return get_data_error_result(message=str(e))

    session_id = get_uuid()
    canvas = Canvas(dsl, tenant_id, agent_id, canvas_id=cvs.id)
    canvas.reset()

    cvs.dsl = json.loads(str(canvas))
    version_title = UserCanvasVersionService.get_latest_version_title(cvs.id, release_mode=release_mode)
    conv = {
        "id": session_id,
        "name": req.get("name", ""),
        "dialog_id": cvs.id,
        "user_id": user_id,
        "exp_user_id": user_id,
        "message": [{"role": "assistant", "content": canvas.get_prologue()}],
        "source": "agent",
        "dsl": cvs.dsl,
        "reference": [],
        "version_title": version_title,
    }
    API4ConversationService.save(**conv)
    return get_result(data=_normalize_agent_session(conv))


@manager.route("/agents/<agent_id>/sessions/<session_id>", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_sync
def get_agent_session(agent_id, session_id, tenant_id):
    exists, conv = API4ConversationService.get_by_id(session_id)
    if not exists:
        return get_data_error_result(message="Session not found!")
    return get_json_result(data=conv.to_dict())


@manager.route("/agents/<agent_id>/sessions/<session_id>", methods=["DELETE"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_sync
def delete_agent_session_item(agent_id, session_id, tenant_id):
    return get_json_result(data=API4ConversationService.delete_by_id(session_id))


@manager.route("/agents/<agent_id>/sessions", methods=["DELETE"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_async
async def delete_agent_session(tenant_id, agent_id):
    errors = []
    success_count = 0
    req = await get_request_json()
    cvs = await thread_pool_exec(UserCanvasService.query, user_id=tenant_id, id=agent_id)
    if not cvs:
        return get_error_data_result(f"You don't own the agent {agent_id}")

    if not req:
        return get_result()

    ids = req.get("ids")
    if not ids:
        if req.get("delete_all") is True:
            ids = [conv.id for conv in await thread_pool_exec(API4ConversationService.query, dialog_id=agent_id)]
            if not ids:
                return get_result()
        else:
            return get_result()

    conv_list = ids

    unique_conv_ids, duplicate_messages = check_duplicate_ids(conv_list, "session")
    conv_list = unique_conv_ids

    for session_id in conv_list:
        conv = await thread_pool_exec(API4ConversationService.query, id=session_id, dialog_id=agent_id)
        if not conv:
            errors.append(f"The agent doesn't own the session {session_id}")
            continue
        await thread_pool_exec(API4ConversationService.delete_by_id, session_id)
        success_count += 1

    if errors:
        if success_count > 0:
            return get_result(data={"success_count": success_count, "errors": errors},
                              message=f"Partially deleted {success_count} sessions with {len(errors)} errors")
        else:
            return get_error_data_result(message="; ".join(errors))

    if duplicate_messages:
        if success_count > 0:
            return get_result(
                message=f"Partially deleted {success_count} sessions with {len(duplicate_messages)} errors",
                data={"success_count": success_count, "errors": duplicate_messages})
        else:
            return get_error_data_result(message=";".join(duplicate_messages))

    return get_result()


@manager.route("/agents/download", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
async def download_agent_file(tenant_id):
    id = request.args.get("id")
    logging.info("Agent file download requested: tenant_id=%s file_id=%s", tenant_id, id)
    blob = await thread_pool_exec(FileService.get_blob, tenant_id, id)
    return Response(blob)


async def _iter_session_completion_events(tenant_id, agent_id, req, return_trace):
    # Stream and non-stream session completions share the same event parsing and trace injection.
    trace_items = []
    async for answer in agent_completion(tenant_id=tenant_id, agent_id=agent_id, **req):
        if isinstance(answer, str):
            try:
                ans = json.loads(answer[5:])
            except Exception:
                continue
        else:
            ans = answer

        event = ans.get("event")
        if event == "node_finished":
            if return_trace:
                data = ans.get("data", {})
                trace_items.append(
                    {
                        "component_id": data.get("component_id"),
                        "trace": [copy.deepcopy(data)],
                    }
                )
                ans.setdefault("data", {})["trace"] = trace_items
            yield ans
            continue

        if event in ["message", "message_end"]:
            yield ans


@manager.route("/agents/templates", methods=["GET"])  # noqa: F821
@login_required
def list_agent_template():
    return get_json_result(data=[item.to_dict() for item in CanvasTemplateService.get_all()])


@manager.route("/agents/prompts", methods=["GET"])  # noqa: F821
@login_required
def prompts():
    from rag.prompts.generator import (
        ANALYZE_TASK_SYSTEM,
        ANALYZE_TASK_USER,
        CITATION_PROMPT_TEMPLATE,
        NEXT_STEP,
        REFLECT,
    )

    return get_json_result(
        data={
            "task_analysis": f"{ANALYZE_TASK_SYSTEM}\n\n{ANALYZE_TASK_USER}",
            "plan_generation": NEXT_STEP,
            "reflection": REFLECT,
            "citation_guidelines": CITATION_PROMPT_TEMPLATE,
        }
    )


@manager.route("/agents", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
def list_agents(tenant_id):
    keywords = request.args.get("keywords", "")
    canvas_category = request.args.get("canvas_category")
    owner_ids = [item for item in request.args.get("owner_ids", "").strip().split(",") if item]
    tags = [item for item in request.args.get("tags", "").strip().split(",") if item]

    page_number = int(request.args.get("page", 0))
    items_per_page = validate_rest_api_page_size(int(request.args.get("page_size", 0)))
    order_by = request.args.get("orderby", "create_time")
    desc = str(request.args.get("desc", "true")).lower() != "false"
    tenants = TenantService.get_joined_tenants_by_user_id(tenant_id)
    authorized_owner_ids = {member["tenant_id"] for member in tenants}
    authorized_owner_ids.add(tenant_id)

    if owner_ids:
        requested_owner_ids = set(owner_ids)
        unauthorized_owner_ids = requested_owner_ids - authorized_owner_ids
        if unauthorized_owner_ids:
            return get_json_result(
                data=False,
                message="Only authorized owner_ids can be queried.",
                code=RetCode.OPERATING_ERROR,
            )
        effective_owner_ids = list(requested_owner_ids)
    else:
        effective_owner_ids = list(authorized_owner_ids)

    canvas, total = UserCanvasService.get_by_tenant_ids(
        effective_owner_ids,
        tenant_id,
        page_number,
        items_per_page,
        order_by,
        desc,
        keywords,
        canvas_category,
        tags,
    )

    return get_json_result(data={"canvas": canvas, "total": total})


@manager.route("/agents/tags", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
def list_agent_tags(tenant_id):
    """Aggregate tag usage counts across agents visible to the caller."""
    canvas_category = request.args.get("canvas_category")
    tenants = TenantService.get_joined_tenants_by_user_id(tenant_id)
    joined_ids = list({member["tenant_id"] for member in tenants} | {tenant_id})
    counts = UserCanvasService.list_tags(joined_ids, tenant_id, canvas_category)
    logging.info(
        "list_agent_tags tenant=%s canvas_category=%s tags_count=%d",
        tenant_id,
        canvas_category,
        len(counts),
    )
    return get_json_result(data=[{"tag": k, "count": v} for k, v in sorted(counts.items(), key=lambda x: (-x[1], x[0]))])


@manager.route("/agents/<canvas_id>/tags", methods=["PUT"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
async def update_agent_tags(tenant_id, canvas_id):
    if not UserCanvasService.accessible(canvas_id, tenant_id):
        logging.info(
            "update_agent_tags denied tenant=%s canvas_id=%s reason=no_permission",
            tenant_id,
            canvas_id,
        )
        return get_json_result(
            data=False,
            message="Agent not found or no permission.",
            code=RetCode.OPERATING_ERROR,
        )
    req = await get_request_json()
    tags = req.get("tags", "")
    incoming = tags if isinstance(tags, (list, tuple)) else [t for t in str(tags).split(",") if t.strip()]
    rows_affected = UserCanvasService.update_tags(canvas_id, tags)
    if rows_affected == 0:
        logging.info(
            "update_agent_tags miss tenant=%s canvas_id=%s incoming_count=%d rows=0",
            tenant_id,
            canvas_id,
            len(incoming),
        )
        return get_json_result(
            data=False,
            message="Agent not found or no permission.",
            code=RetCode.OPERATING_ERROR,
        )
    logging.info(
        "update_agent_tags ok tenant=%s canvas_id=%s incoming_count=%d rows=%d",
        tenant_id,
        canvas_id,
        len(incoming),
        rows_affected,
    )
    return get_json_result(data=True)


@manager.route("/agents", methods=["POST"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
async def create_agent(tenant_id):
    req = {k: v for k, v in (await get_request_json()).items() if v is not None}
    req["canvas_type"] = req.get("canvas_type","")
    req["user_id"] = tenant_id
    req["canvas_category"] = req.get("canvas_category") or CanvasCategory.Agent
    req["release"] = bool(req.get("release", ""))

    if req.get("dsl") is None:
        return get_json_result(
            data=False,
            message="No DSL data in request.",
            code=RetCode.ARGUMENT_ERROR,
        )

    try:
        req["dsl"] = CanvasReplicaService.normalize_dsl(req["dsl"])
    except ValueError as exc:
        return get_json_result(
            data=False,
            message=str(exc),
            code=RetCode.ARGUMENT_ERROR,
        )

    if req.get("title") is None:
        return get_json_result(
            data=False,
            message="No title in request.",
            code=RetCode.ARGUMENT_ERROR,
        )

    req["title"] = req["title"].strip()
    for canvas in UserCanvasService.query(user_id=tenant_id, canvas_category=req["canvas_category"]):
        canvas_title = getattr(canvas, "title", req["title"])
        if canvas_title and canvas_title.lower() == req["title"].lower():
            return get_data_error_result(message=f"{req['title']} already exists.")

    req["id"] = get_uuid()
    if not UserCanvasService.save(**req):
        return get_data_error_result(message="Fail to create agent.")

    owner_nickname = _get_user_nickname(tenant_id)
    UserCanvasVersionService.save_or_replace_latest(
        user_canvas_id=req["id"],
        title=UserCanvasVersionService.build_version_title(owner_nickname, req.get("title")),
        dsl=req["dsl"],
        release=req.get("release"),
    )
    replica_ok = CanvasReplicaService.replace_for_set(
        canvas_id=req["id"],
        tenant_id=str(tenant_id),
        runtime_user_id=str(tenant_id),
        dsl=req["dsl"],
        canvas_category=req["canvas_category"],
        title=req.get("title", ""),
    )
    if not replica_ok:
        return get_data_error_result(message="canvas saved, but replica sync failed.")

    exists, created_agent = UserCanvasService.get_by_canvas_id(req["id"])
    if not exists:
        return get_data_error_result(message="Fail to create agent.")
    return get_json_result(data=created_agent)


@manager.route("/agents/<agent_id>/upload", methods=["POST"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_async
async def upload_agent_file(agent_id, tenant_id):
    files = await request.files
    file_objs = files.getlist("file") if files and files.get("file") else []
    logging.info(
        "Agent file upload requested: tenant_id=%s agent_id=%s file_count=%s",
        tenant_id,
        agent_id,
        len(file_objs),
    )
    try:
        if len(file_objs) == 1:
            uploaded = await thread_pool_exec(
                FileService.upload_info, tenant_id, file_objs[0], request.args.get("url")
            )
            return get_json_result(data=uploaded)
        results = await asyncio.gather(
            *(thread_pool_exec(FileService.upload_info, tenant_id, file_obj) for file_obj in file_objs)
        )
        return get_json_result(data=results)
    except Exception as exc:
        logging.exception(
            "Agent file upload failed: tenant_id=%s agent_id=%s",
            tenant_id,
            agent_id,
        )
        return server_error_response(exc)


@manager.route("/agents/<agent_id>/components/<component_id>/input-form", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_sync
def get_agent_component_input_form(agent_id, component_id, tenant_id):
    try:
        from agent.canvas import Canvas

        exists, user_canvas = UserCanvasService.get_by_id(agent_id)
        if not exists:
            return get_data_error_result(message="canvas not found.")
        canvas = Canvas(json.dumps(user_canvas.dsl), tenant_id, canvas_id=user_canvas.id)
        return get_json_result(data=canvas.get_component_input_form(component_id))
    except Exception as exc:
        return server_error_response(exc)


@manager.route("/agents/<agent_id>/components/<component_id>/debug", methods=["POST"])  # noqa: F821
@validate_request("params")
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_async
async def debug_agent_component(agent_id, component_id, tenant_id):
    req = await get_request_json()
    try:
        from agent.canvas import Canvas
        from agent.component import LLM

        _, user_canvas = UserCanvasService.get_by_id(agent_id)
        canvas = Canvas(json.dumps(user_canvas.dsl), tenant_id, canvas_id=user_canvas.id)
        canvas.reset()
        canvas.message_id = get_uuid()
        component = canvas.get_component(component_id)["obj"]
        component.reset()

        if isinstance(component, LLM):
            component.set_debug_inputs(req["params"])
        component.invoke(**{k: o["value"] for k, o in req["params"].items()})
        outputs = component.output()
        for k in outputs.keys():
            if isinstance(outputs[k], partial):
                txt = ""
                iter_obj = outputs[k]()
                if inspect.isasyncgen(iter_obj):
                    async for c in iter_obj:
                        txt += c
                else:
                    for c in iter_obj:
                        txt += c
                outputs[k] = txt
        return get_json_result(data=outputs)
    except Exception as exc:
        return server_error_response(exc)


@manager.route("/agents/<agent_id>", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
def get_agent(agent_id, tenant_id):
    if not UserCanvasService.accessible(agent_id, tenant_id):
        return get_data_error_result(message="canvas not found.")

    exists, canvas = UserCanvasService.get_by_canvas_id(agent_id)
    if not exists:
        return get_data_error_result(message="canvas not found.")

    try:
        CanvasReplicaService.bootstrap(
            canvas_id=agent_id,
            tenant_id=str(tenant_id),
            runtime_user_id=str(tenant_id),
            dsl=canvas.get("dsl"),
            canvas_category=canvas.get("canvas_category", CanvasCategory.Agent),
            title=canvas.get("title", ""),
        )
    except ValueError as exc:
        return get_data_error_result(message=str(exc))

    last_publish_time = None
    versions = UserCanvasVersionService.list_by_canvas_id(agent_id)
    if versions:
        released_versions = [version for version in versions if version.release]
        if released_versions:
            released_versions.sort(key=lambda version: version.update_time, reverse=True)
            last_publish_time = released_versions[0].update_time

    from agent.dsl_migration import normalize_chunker_dsl

    canvas["dsl"] = normalize_chunker_dsl(canvas.get("dsl", {}))
    canvas["last_publish_time"] = last_publish_time

    if canvas.get("canvas_category") == CanvasCategory.DataFlow:
        datasets = list(KnowledgebaseService.query(pipeline_id=agent_id))
        canvas["datasets"] = [{"id": item.id, "name": item.name, "avatar": item.avatar} for item in datasets]

    return get_json_result(data=canvas)


@manager.route("/agents/<agent_id>/versions", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_sync
def list_agent_versions(agent_id, tenant_id):
    try:
        versions = sorted(
            [item.to_dict() for item in UserCanvasVersionService.list_by_canvas_id(agent_id)],
            key=lambda item: item["update_time"] * -1,
        )
        return get_json_result(data=versions)
    except Exception as exc:
        return get_data_error_result(message=f"Error getting history files: {exc}")


@manager.route("/agents/<agent_id>/versions/<version_id>", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_sync
def get_agent_version(agent_id, version_id, tenant_id):
    try:
        exists, version = UserCanvasVersionService.get_by_id(version_id)
        if not exists or not version or str(version.user_canvas_id) != str(agent_id):
            return get_data_error_result(message="Version not found.")
        return get_json_result(data=version.to_dict())
    except Exception as exc:
        return get_data_error_result(message=f"Error getting history file: {exc}")


@manager.route("/agents/<agent_id>/logs/<message_id>", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_async
async def get_agent_logs(agent_id, message_id, tenant_id):
    try:
        from rag.utils.redis_conn import REDIS_CONN

        binary = await thread_pool_exec(REDIS_CONN.get, f"{agent_id}-{message_id}-logs")
        if not binary:
            return get_json_result(data={})

        payload = binary.decode("utf-8") if isinstance(binary, bytes) else binary
        return get_json_result(data=json.loads(payload))
    except Exception as exc:
        logging.exception(exc)
        return server_error_response(exc)


@manager.route("/agents/<agent_id>", methods=["DELETE"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_owner_sync
def delete_agent(agent_id, tenant_id):
    UserCanvasService.delete_by_id(agent_id)
    return get_json_result(data=True)


@manager.route("/agents/<agent_id>", methods=["PUT"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_async
async def update_agent(agent_id, tenant_id):
    req = {k: v for k, v in (await get_request_json()).items() if v is not None}
    req["canvas_type"] = req.get("canvas_type","")
    req["release"] = bool(req.get("release", ""))

    if req.get("dsl") is not None:
        try:
            req["dsl"] = CanvasReplicaService.normalize_dsl(req["dsl"])
        except ValueError as exc:
            return get_json_result(
                data=False,
                message=str(exc),
                code=RetCode.ARGUMENT_ERROR,
            )

    _, current_agent = UserCanvasService.get_by_id(agent_id)
    if req.get("title") is not None:
        req["title"] = req["title"].strip()
        canvas_category_for_duplicate_check = req.get("canvas_category") or (current_agent.canvas_category if current_agent else CanvasCategory.Agent)
        for canvas in UserCanvasService.query(user_id=tenant_id, canvas_category=canvas_category_for_duplicate_check):
            canvas_title = getattr(canvas, "title", "")
            if getattr(canvas, "id", None) != agent_id and canvas_title and canvas_title.lower() == req["title"].lower():
                return get_data_error_result(message=f"{req['title']} already exists.")

    agent_title_for_version = req.get("title") or (current_agent.title if current_agent else "")
    canvas_category = (
        req.get("canvas_category")
        or (current_agent.canvas_category if current_agent else CanvasCategory.Agent)
    )
    owner_nickname = _get_user_nickname(tenant_id)
    UserCanvasService.update_by_id(agent_id, req)

    if req.get("dsl") is not None:
        UserCanvasVersionService.save_or_replace_latest(
            user_canvas_id=agent_id,
            title=UserCanvasVersionService.build_version_title(owner_nickname, agent_title_for_version),
            dsl=req["dsl"],
            release=req.get("release"),
        )
        replica_ok = CanvasReplicaService.replace_for_set(
            canvas_id=agent_id,
            tenant_id=str(tenant_id),
            runtime_user_id=str(tenant_id),
            dsl=req["dsl"],
            canvas_category=canvas_category,
            title=agent_title_for_version,
        )
        if not replica_ok:
            return get_data_error_result(message="agent saved, but replica sync failed.")

    return get_json_result(data=True)


@manager.route("/agents/<agent_id>/reset", methods=["POST"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
@_require_canvas_access_async
async def reset_agent(agent_id, tenant_id):
    try:
        from agent.canvas import Canvas

        exists, user_canvas = UserCanvasService.get_by_id(agent_id)
        if not exists:
            return get_data_error_result(message="canvas not found.")

        canvas = Canvas(json.dumps(user_canvas.dsl), tenant_id, canvas_id=user_canvas.id)
        canvas.reset()
        dsl = json.loads(str(canvas))
        UserCanvasService.update_by_id(agent_id, {"dsl": dsl})
        replica_ok = CanvasReplicaService.replace_for_set(
            canvas_id=agent_id,
            tenant_id=str(tenant_id),
            runtime_user_id=str(tenant_id),
            dsl=dsl,
            canvas_category=user_canvas.canvas_category,
            title=user_canvas.title,
        )
        if not replica_ok:
            return get_data_error_result(message="agent reset, but replica sync failed.")
        return get_json_result(data=dsl)
    except Exception as exc:
        return server_error_response(exc)


@manager.route("/agents/rerun", methods=["POST"])  # noqa: F821
@validate_request("id", "dsl", "component_id")
@login_required
@add_tenant_id_to_kwargs
async def rerun_agent(tenant_id):
    from rag.nlp import search

    req = await get_request_json()
    doc = PipelineOperationLogService.get_documents_info(req["id"])
    if not doc:
        return get_data_error_result(message="Document not found.")
    doc = doc[0]
    if 0 < doc["progress"] < 1:
        return get_data_error_result(message=f"`{doc['name']}` is processing...")

    if settings.docStoreConn.index_exist(search.index_name(tenant_id), doc["kb_id"]):
        settings.docStoreConn.delete({"doc_id": doc["id"]}, search.index_name(tenant_id), doc["kb_id"])
    doc["progress_msg"] = ""
    doc["chunk_num"] = 0
    doc["token_num"] = 0
    DocumentService.clear_chunk_num_when_rerun(doc["id"])
    DocumentService.update_by_id(doc["id"], doc)
    TaskService.filter_delete([Task.doc_id == doc["id"]])

    dsl = req["dsl"]
    dsl["path"] = [req["component_id"]]
    PipelineOperationLogService.update_by_id(req["id"], {"dsl": dsl})
    queue_dataflow(
        tenant_id=tenant_id,
        flow_id=req["id"],
        task_id=get_uuid(),
        doc_id=doc["id"],
        priority=0,
        rerun=True,
    )
    return get_json_result(data=True)


@manager.route("/agents/test_db_connection", methods=["POST"])  # noqa: F821
@validate_request("db_type", "database", "username", "host", "port", "password")
@login_required
async def test_db_connection():
    req = await get_request_json()
    try:
        safe_host = assert_host_is_safe(req["host"])
    except ValueError as exc:
        logging.warning(
            "Rejected test_db_connection: unsafe host %r (db_type=%s, user=%s): %s",
            req.get("host"), req.get("db_type"), current_user.id, exc,
        )
        return get_data_error_result(message=str(exc))
    except OSError as exc:
        logging.warning(
            "Rejected test_db_connection: cannot resolve host %r (db_type=%s, user=%s): %s",
            req.get("host"), req.get("db_type"), current_user.id, exc,
        )
        logging.debug("Full resolver exception for host %r", req.get("host"), exc_info=True)
        return get_data_error_result(message=f"Could not resolve host {req.get('host')!r}.")
    try:
        if req["db_type"] in ["mysql", "mariadb"]:
            db = MySQLDatabase(
                req["database"],
                user=req["username"],
                host=safe_host,
                port=req["port"],
                password=req["password"],
            )
            with db.connection_context():
                db.execute_sql("SELECT 1")
        elif req["db_type"] == "oceanbase":
            db = MySQLDatabase(
                req["database"],
                user=req["username"],
                host=safe_host,
                port=req["port"],
                password=req["password"],
                charset="utf8mb4",
            )
            with db.connection_context():
                db.execute_sql("SELECT 1")
        elif req["db_type"] == "postgres":
            db = PostgresqlDatabase(
                req["database"],
                user=req["username"],
                host=safe_host,
                port=req["port"],
                password=req["password"],
            )
            with db.connection_context():
                db.execute_sql("SELECT 1")
        elif req["db_type"] == "mssql":
            import pyodbc

            connection_string = (
                f"DRIVER={{ODBC Driver 17 for SQL Server}};"
                f"SERVER={safe_host},{req['port']};"
                f"DATABASE={req['database']};"
                f"UID={req['username']};"
                f"PWD={req['password']};"
            )
            db = pyodbc.connect(connection_string)
            try:
                cursor = db.cursor()
                try:
                    cursor.execute("SELECT 1")
                finally:
                    cursor.close()
            finally:
                db.close()
        elif req["db_type"] == "IBM DB2":
            import ibm_db

            conn_str = (
                f"DATABASE={req['database']};"
                f"HOSTNAME={safe_host};"
                f"PORT={req['port']};"
                f"PROTOCOL=TCPIP;"
                f"UID={req['username']};"
                f"PWD={req['password']};"
            )
            logging.info(
                "DATABASE=%s;HOSTNAME=%s;PORT=%s;PROTOCOL=TCPIP;UID=%s;PWD=****;",
                req["database"],
                safe_host,
                req["port"],
                req["username"],
            )
            conn = ibm_db.connect(conn_str, "", "")
            stmt = ibm_db.exec_immediate(conn, "SELECT 1 FROM sysibm.sysdummy1")
            ibm_db.fetch_assoc(stmt)
            ibm_db.close(conn)
        elif req["db_type"] == "trino":
            import os
            import trino

            db_name = req["database"]
            if "." in db_name:
                catalog, schema = db_name.split(".", 1)
            elif "/" in db_name:
                catalog, schema = db_name.split("/", 1)
            else:
                catalog, schema = db_name, "default"

            http_scheme = "https" if os.environ.get("TRINO_USE_TLS", "0") == "1" else "http"
            auth = None
            if http_scheme == "https" and req.get("password"):
                auth = trino.BasicAuthentication(req.get("username") or "ragflow", req["password"])

            conn = trino.dbapi.connect(
                host=safe_host,
                port=int(req["port"] or 8080),
                user=req["username"] or "ragflow",
                catalog=catalog,
                schema=schema or "default",
                http_scheme=http_scheme,
                auth=auth,
            )
            try:
                cur = conn.cursor()
                try:
                    cur.execute("SELECT 1")
                    cur.fetchall()
                finally:
                    cur.close()
            finally:
                conn.close()
        else:
            return server_error_response("Unsupported database type.")

        return get_json_result(data="Database Connection Successful!")
    except Exception as exc:
        return server_error_response(exc)


# NOTE: The singular form `/agents/chat/completion` was a historical typo
# in earlier releases — no client, SDK, or doc ever used it, and the
# plural form below is the canonical route. The singular is intentionally
# NOT registered; clients sending it receive 404.
@manager.route("/agents/chat/completions", methods=["POST"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
async def agent_chat_completion(tenant_id, agent_id=None):
    # This endpoint serves two execution modes:
    # 1. Draft/runtime execution without session state. The request runs against the caller's
    #    runtime replica, which is populated from the editable canvas state.
    # 2. Session continuation with an existing session_id. The request resumes from the stored
    #    API4Conversation state and must stay bound to the same agent and an accessible canvas.
    #
    # Security constraints:
    # - agent_id is always supplied at the route layer and is not forwarded downstream as a free-form kwarg.
    # - New runs without session_id must pass UserCanvasService.accessible(...) before the runtime replica is loaded.
    # - Existing sessions are validated here at the route layer before handing control to the lower-level
    #   completion functions, so canvas_service only executes a pre-authorized session payload.
    #
    # Response modes:
    # - Regular mode emits internal agent events.
    # - openai-compatible mode reshapes the same execution into an OpenAI-like wire format.
    req = await get_request_json()
    agent_id = agent_id or req.get("agent_id")
    openai_compatible = bool(req.get("openai-compatible", False))
    if not agent_id:
        return get_json_result(
            data=False,
            message="`agent_id` is required.",
            code=RetCode.ARGUMENT_ERROR,
        )
    # Route-level selectors should not be forwarded into the lower-level completion functions.
    req = dict(req)
    req.pop("agent_id", None)
    req.pop("openai-compatible", None)
    session_id = req.get("session_id")
    workflow_session = False
    workflow_conv = None
    if session_id:
        exists, conv = API4ConversationService.get_by_id(session_id)
        if not exists:
            return get_data_error_result(message="Session not found!")
        if conv.dialog_id != agent_id:
            return get_json_result(
                data=False,
                message="Session does not belong to the requested agent.",
                code=RetCode.OPERATING_ERROR,
            )
        if not UserCanvasService.accessible(agent_id, tenant_id):
            return get_json_result(
                data=False,
                message="Only authorized users can access this agent session.",
                code=RetCode.OPERATING_ERROR,
            )
        workflow_session = getattr(conv, "source", "") == "workflow"
        if workflow_session:
            workflow_conv = conv.to_dict()

    if openai_compatible:
        # OpenAI-compatible mode uses a different wire format, keep it separate from regular agent events.
        messages = req.get("messages", [])
        if not messages:
            return get_data_error_result(message="You must provide at least one message.")
        question = next((m.get("content", "") for m in reversed(messages) if m.get("role") == "user"), "")
        stream = req.pop("stream", False)
        session_id = req.pop("session_id", req.get("id", "")) or req.get("metadata", {}).get("id", "")
        if stream:
            return _build_sse_response(
                completion_openai(
                    tenant_id,
                    agent_id,
                    question,
                    session_id=session_id,
                    stream=True,
                    **req,
                )
            )

        async for response in completion_openai(
            tenant_id,
            agent_id,
            question,
            session_id=session_id,
            stream=False,
            **req,
        ):
            return jsonify(response)
        return None

    if workflow_session:
        query = req.get("query", "") or req.get("question", "")
        files = req.get("files", [])
        inputs = req.get("inputs", {})
        runtime_user_id = req.get("user_id") or tenant_id
        user_id = str(runtime_user_id)
        custom_header = req.get("custom_header", "")

        _, cvs = await thread_pool_exec(UserCanvasService.get_by_id, agent_id)
        if not cvs:
            return get_data_error_result(message="canvas not found.")

        if not isinstance(workflow_conv.get("message"), list):
            workflow_conv["message"] = []
        if isinstance(workflow_conv.get("reference"), dict):
            if "chunks" in workflow_conv["reference"]:
                workflow_conv["reference"] = [workflow_conv["reference"]]
            else:
                workflow_conv["reference"] = [
                    value for _, value in sorted(workflow_conv["reference"].items(), key=lambda item: int(item[0]))
                ]
        elif not isinstance(workflow_conv.get("reference"), list):
            workflow_conv["reference"] = []
        workflow_conv["reference"] = [_normalize_agent_reference_entry(reference) for reference in workflow_conv["reference"]]
        turn_id = get_uuid()
        workflow_conv["message"].append(
            {
                "role": "user",
                "content": query,
                "id": turn_id,
                "files": files,
                "created_at": time.time(),
            }
        )
        await thread_pool_exec(API4ConversationService.update_by_id, session_id, workflow_conv)

        try:
            from agent.canvas import Canvas

            workflow_dsl = workflow_conv.get("dsl", {})
            if isinstance(workflow_dsl, str):
                dsl_str = workflow_dsl
            else:
                dsl_str = json.dumps(workflow_dsl, ensure_ascii=False)
            canvas = Canvas(dsl_str, str(tenant_id), canvas_id=agent_id, custom_header=custom_header)
        except Exception as exc:
            return server_error_response(exc)

        return await _run_workflow_session(
            tenant_id=tenant_id,
            agent_id=agent_id,
            workflow_conv=workflow_conv,
            canvas=canvas,
            query=query,
            files=files,
            inputs=inputs,
            user_id=user_id,
            session_id=session_id,
            custom_header=custom_header,
            canvas_title=getattr(cvs, "title", ""),
            canvas_category=getattr(cvs, "canvas_category", CanvasCategory.Agent),
            return_trace=bool(req.get("return_trace", False)),
            stream=req.get("stream", True),
            chat_template_kwargs=req.get("chat_template_kwargs"),
        )

    if not session_id:
        if not UserCanvasService.accessible(agent_id, tenant_id):
            return get_json_result(
                data=False,
                message="Make sure you have permission to access the agent.",
                code=RetCode.OPERATING_ERROR,
            )

        # Keep the original workflow execution path, but assign a session_id so the
        # response shape stays closer to the older agent completion contract.
        query = req.get("query", "") or req.get("question", "")
        files = req.get("files", [])
        inputs = req.get("inputs", {})
        runtime_user_id = req.get("user_id") or tenant_id
        user_id = str(runtime_user_id)
        custom_header = req.get("custom_header", "")
        session_id = get_uuid()

        _, cvs = await thread_pool_exec(UserCanvasService.get_by_id, agent_id)
        if not cvs:
            return get_data_error_result(message="canvas not found.")

        replica_payload = CanvasReplicaService.load_for_run(
            canvas_id=agent_id,
            tenant_id=str(tenant_id),
            runtime_user_id=user_id,
        )
        if not replica_payload:
            try:
                replica_payload = CanvasReplicaService.bootstrap(
                    canvas_id=agent_id,
                    tenant_id=str(tenant_id),
                    runtime_user_id=user_id,
                    dsl=cvs.dsl,
                    canvas_category=getattr(cvs, "canvas_category", CanvasCategory.Agent),
                    title=getattr(cvs, "title", ""),
                )
            except ValueError as exc:
                return get_data_error_result(message=str(exc))
        if not replica_payload:
            return get_data_error_result(message="canvas replica not found, please fetch the agent first.")

        replica_dsl = replica_payload.get("dsl", {})
        canvas_title = replica_payload.get("title", "")
        canvas_category = replica_payload.get("canvas_category", CanvasCategory.Agent)
        dsl_str = json.dumps(replica_dsl, ensure_ascii=False)

        if cvs.canvas_category == CanvasCategory.DataFlow:
            from rag.flow.pipeline import Pipeline

            task_id = get_uuid()
            workflow_conv = {
                "id": session_id,
                "dialog_id": cvs.id,
                "user_id": user_id,
                "exp_user_id": user_id,
                "name": req.get("name", ""),
                "message": [
                    {
                        "role": "user",
                        "content": query,
                        "id": task_id,
                        "files": files,
                        "created_at": time.time(),
                    }
                ],
                "reference": [],
                "source": "workflow",
                "dsl": replica_dsl,
                "version_title": await thread_pool_exec(
                    UserCanvasVersionService.get_latest_version_title,
                    cvs.id,
                    release_mode=False,
                ),
            }
            await thread_pool_exec(API4ConversationService.save, **workflow_conv)
            Pipeline(
                dsl_str,
                tenant_id=str(tenant_id),
                doc_id=CANVAS_DEBUG_DOC_ID,
                task_id=task_id,
                flow_id=agent_id,
            )
            ok, error_message = await thread_pool_exec(
                queue_dataflow,
                user_id,
                agent_id,
                task_id,
                CANVAS_DEBUG_DOC_ID,
                files[0],
                0,
            )
            if not ok:
                return get_data_error_result(message=error_message)
            return get_json_result(data={"message_id": task_id, "session_id": session_id})

        try:
            from agent.canvas import Canvas

            canvas = Canvas(dsl_str, str(tenant_id), canvas_id=agent_id, custom_header=custom_header)
            canvas.clear_history()
        except Exception as exc:
            return server_error_response(exc)
        turn_id = get_uuid()
        workflow_conv = {
            "id": session_id,
            "dialog_id": cvs.id,
            "user_id": user_id,
            "exp_user_id": user_id,
            "name": req.get("name") or (query[:250] if query else "") or "",
            "message": [
                {
                    "role": "user",
                    "content": query,
                    "id": turn_id,
                    "files": files,
                    "created_at": time.time(),
                }
            ],
            "reference": [],
            "source": "workflow",
            "dsl": replica_dsl,
            "version_title": await thread_pool_exec(
                UserCanvasVersionService.get_latest_version_title,
                cvs.id,
                release_mode=False,
            ),
        }
        workflow_conv["reference"] = [_normalize_agent_reference_entry(reference) for reference in workflow_conv["reference"]]
        await thread_pool_exec(API4ConversationService.save, **workflow_conv)
        return await _run_workflow_session(
            tenant_id=tenant_id,
            agent_id=agent_id,
            workflow_conv=workflow_conv,
            canvas=canvas,
            query=query,
            files=files,
            inputs=inputs,
            user_id=user_id,
            session_id=session_id,
            custom_header=custom_header,
            canvas_title=canvas_title,
            canvas_category=canvas_category,
            return_trace=bool(req.get("return_trace", False)),
            stream=req.get("stream", True),
            chat_template_kwargs=req.get("chat_template_kwargs"),
        )

    return_trace = bool(req.get("return_trace", False))
    if req.get("stream", True):

        async def generate():
            async for ans in _iter_session_completion_events(tenant_id, agent_id, req, return_trace):
                yield "data:" + json.dumps(ans, ensure_ascii=False) + "\n\n"
            yield "data:[DONE]\n\n"

        return _build_sse_response(generate())

    full_content = ""
    reference = {}
    final_ans = {}
    trace_items = []
    structured_output = {}
    async for ans in _iter_session_completion_events(tenant_id, agent_id, req, return_trace):
        try:
            if ans["event"] == "message":
                full_content += ans["data"]["content"]
            if ans.get("data", {}).get("reference", None):
                reference.update(ans["data"]["reference"])
            if ans.get("event") == "node_finished":
                data = ans.get("data", {})
                node_out = data.get("outputs", {})
                component_id = data.get("component_id")
                if component_id is not None and "structured" in node_out:
                    structured_output[component_id] = copy.deepcopy(node_out["structured"])
                if return_trace:
                    trace_items.append(
                        {
                            "component_id": data.get("component_id"),
                            "trace": [copy.deepcopy(data)],
                        }
                    )
            final_ans = ans
        except Exception as exc:
            return get_result(data=f"**ERROR**: {str(exc)}")

    if not final_ans:
        return get_result(data={})

    if "data" not in final_ans or not isinstance(final_ans["data"], dict):
        final_ans["data"] = {}
    final_ans["data"]["content"] = full_content
    final_ans["data"]["reference"] = reference
    if structured_output:
        final_ans["data"]["structured"] = structured_output
    if return_trace and final_ans:
        final_ans["data"]["trace"] = trace_items
    return get_result(data=final_ans)


@manager.route("/agents/<agent_id>/webhook", methods=["POST", "GET", "PUT", "PATCH", "DELETE", "HEAD"])  # noqa: F821
@manager.route("/agents/<agent_id>/webhook/test",methods=["POST", "GET", "PUT", "PATCH", "DELETE", "HEAD"],)  # noqa: F821
async def webhook(agent_id: str):
    is_test = request.path.startswith(f"/api/v1/agents/{agent_id}/webhook/test")
    start_ts = time.time()

    # 1. Fetch canvas by agent_id
    exists, cvs = UserCanvasService.get_by_id(agent_id)
    if not exists:
        return get_data_error_result(code=RetCode.BAD_REQUEST,message="Canvas not found."),RetCode.BAD_REQUEST

    # 2. Check canvas category
    if cvs.canvas_category == CanvasCategory.DataFlow:
        return get_data_error_result(code=RetCode.BAD_REQUEST,message="Dataflow can not be triggered by webhook."),RetCode.BAD_REQUEST

    # 3. Load DSL from canvas
    dsl = getattr(cvs, "dsl", None)
    if not isinstance(dsl, dict):
        return get_data_error_result(code=RetCode.BAD_REQUEST,message="Invalid DSL format."),RetCode.BAD_REQUEST

    # 4. Check webhook configuration in DSL
    webhook_cfg = {}
    components = dsl.get("components", {})
    for k, _ in components.items():
        cpn_obj = components[k]["obj"]
        if cpn_obj["component_name"].lower() == "begin" and cpn_obj["params"]["mode"] == "Webhook":
            webhook_cfg = cpn_obj["params"]

    if not webhook_cfg:
        return get_data_error_result(code=RetCode.BAD_REQUEST,message="Webhook not configured for this agent."),RetCode.BAD_REQUEST

    # 5. Validate request method against webhook_cfg.methods
    allowed_methods = webhook_cfg.get("methods", [])
    request_method = request.method.upper()
    if allowed_methods and request_method not in allowed_methods:
        return get_data_error_result(
            code=RetCode.BAD_REQUEST,message=f"HTTP method '{request_method}' not allowed for this webhook."
        ),RetCode.BAD_REQUEST

    # 6. Validate webhook security
    async def validate_webhook_security(security_cfg: dict):
        """Validate webhook security rules based on security configuration."""

        if not security_cfg:
            return  # No security config → allowed by default

        # 1. Validate max body size
        await _validate_max_body_size(security_cfg)

        # 2. Validate IP whitelist
        _validate_ip_whitelist(security_cfg)

        # # 3. Validate rate limiting
        _validate_rate_limit(security_cfg)

        # 4. Validate authentication
        auth_type = security_cfg.get("auth_type", "none")

        if auth_type == "none":
            return

        if auth_type == "token":
            _validate_token_auth(security_cfg)

        elif auth_type == "basic":
            _validate_basic_auth(security_cfg)

        elif auth_type == "jwt":
            _validate_jwt_auth(security_cfg)

        else:
            raise Exception(f"Unsupported auth_type: {auth_type}")

    async def _validate_max_body_size(security_cfg):
        """Check request size does not exceed max_body_size."""
        max_size = security_cfg.get("max_body_size")
        if not max_size:
            return

        # Convert "10MB" → bytes
        units = {"kb": 1024, "mb": 1024**2}
        size_str = max_size.lower()

        for suffix, factor in units.items():
            if size_str.endswith(suffix):
                limit = int(size_str.replace(suffix, "")) * factor
                break
        else:
            raise Exception("Invalid max_body_size format")
        MAX_LIMIT = 10 * 1024 * 1024  # 10MB
        if limit > MAX_LIMIT:
            raise Exception("max_body_size exceeds maximum allowed size (10MB)")

        content_length = request.content_length or 0
        if content_length > limit:
            raise Exception(f"Request body too large: {content_length} > {limit}")

    def _validate_ip_whitelist(security_cfg):
        """Allow only IPs listed in ip_whitelist."""
        whitelist = security_cfg.get("ip_whitelist", [])
        if not whitelist:
            return

        client_ip = request.remote_addr


        for rule in whitelist:
            if "/" in rule:
                # CIDR notation
                if ipaddress.ip_address(client_ip) in ipaddress.ip_network(rule, strict=False):
                    return
            else:
                # Single IP
                if client_ip == rule:
                    return

        raise Exception(f"IP {client_ip} is not allowed by whitelist")

    def _validate_rate_limit(security_cfg):
        """Simple in-memory rate limiting."""
        rl = security_cfg.get("rate_limit")
        if not rl:
            return

        limit = int(rl.get("limit", 60))
        if limit <= 0:
            raise Exception("rate_limit.limit must be > 0")
        per = rl.get("per", "minute")

        window = {
            "second": 1,
            "minute": 60,
            "hour": 3600,
            "day": 86400,
        }.get(per)

        if not window:
            raise Exception(f"Invalid rate_limit.per: {per}")

        capacity = limit
        rate = limit / window
        cost = 1

        key = f"rl:tb:{agent_id}"
        now = time.time()

        try:
            from rag.utils.redis_conn import REDIS_CONN

            res = REDIS_CONN.lua_token_bucket(
                keys=[key],
                args=[capacity, rate, now, cost],
                client=REDIS_CONN.REDIS,
            )

            allowed = int(res[0])
            if allowed != 1:
                raise Exception("Too many requests (rate limit exceeded)")

        except Exception as e:
            raise Exception(f"Rate limit error: {e}")

    def _validate_token_auth(security_cfg):
        """Validate header-based token authentication."""
        token_cfg = security_cfg.get("token",{})
        header = token_cfg.get("token_header")
        token_value = token_cfg.get("token_value")

        provided = request.headers.get(header)
        if provided != token_value:
            raise Exception("Invalid token authentication")

    def _validate_basic_auth(security_cfg):
        """Validate HTTP Basic Auth credentials."""
        auth_cfg = security_cfg.get("basic_auth", {})
        username = auth_cfg.get("username")
        password = auth_cfg.get("password")

        auth = request.authorization
        if not auth or auth.username != username or auth.password != password:
            raise Exception("Invalid Basic Auth credentials")

    def _validate_jwt_auth(security_cfg):
        """Validate JWT token in Authorization header."""
        jwt_cfg = security_cfg.get("jwt", {})
        secret = jwt_cfg.get("secret")
        if not secret:
            raise Exception("JWT secret not configured")

        auth_header = request.headers.get("Authorization", "")
        if not auth_header.startswith("Bearer "):
            raise Exception("Missing Bearer token")

        token = auth_header[len("Bearer "):].strip()
        if not token:
            raise Exception("Empty Bearer token")

        alg = (jwt_cfg.get("algorithm") or "HS256").upper()

        decode_kwargs = {
            "key": secret,
            "algorithms": [alg],
        }
        options = {}
        if jwt_cfg.get("audience"):
            decode_kwargs["audience"] = jwt_cfg["audience"]
            options["verify_aud"] = True
        else:
            options["verify_aud"] = False

        if jwt_cfg.get("issuer"):
            decode_kwargs["issuer"] = jwt_cfg["issuer"]
            options["verify_iss"] = True
        else:
            options["verify_iss"] = False
        try:
            decoded = jwt.decode(
                token,
                options=options,
                **decode_kwargs,
            )
        except Exception as e:
            raise Exception(f"Invalid JWT: {str(e)}")

        raw_required_claims = jwt_cfg.get("required_claims", [])
        if isinstance(raw_required_claims, str):
            required_claims = [raw_required_claims]
        elif isinstance(raw_required_claims, (list, tuple, set)):
            required_claims = list(raw_required_claims)
        else:
            required_claims = []

        required_claims = [
            c for c in required_claims
            if isinstance(c, str) and c.strip()
        ]

        RESERVED_CLAIMS = {"exp", "sub", "aud", "iss", "nbf", "iat"}
        for claim in required_claims:
            if claim in RESERVED_CLAIMS:
                raise Exception(f"Reserved JWT claim cannot be required: {claim}")

        for claim in required_claims:
            if claim not in decoded:
                raise Exception(f"Missing JWT claim: {claim}")

        return decoded

    try:
        security_config=webhook_cfg.get("security", {})
        await validate_webhook_security(security_config)
    except Exception as e:
        return get_data_error_result(code=RetCode.BAD_REQUEST,message=str(e)),RetCode.BAD_REQUEST
    if not isinstance(cvs.dsl, str):
        dsl = json.dumps(cvs.dsl, ensure_ascii=False)
    try:
        from agent.canvas import Canvas

        canvas = Canvas(dsl, cvs.user_id, agent_id, canvas_id=agent_id)
    except Exception as e:
        resp=get_data_error_result(code=RetCode.BAD_REQUEST,message=str(e))
        resp.status_code = RetCode.BAD_REQUEST
        return resp

    # 7. Parse request body
    async def parse_webhook_request(content_type):
        """Parse request based on content-type and return structured data."""

        # 1. Query
        query_data = {k: v for k, v in request.args.items()}

        # 2. Headers
        header_data = {k: v for k, v in request.headers.items()}

        # 3. Body
        ctype = request.headers.get("Content-Type", "").split(";")[0].strip()
        if ctype and ctype != content_type:
            raise ValueError(
                f"Invalid Content-Type: expect '{content_type}', got '{ctype}'"
            )

        body_data: dict = {}

        try:
            if ctype == "application/json":
                body_data = await request.get_json() or {}

            elif ctype == "multipart/form-data":
                nonlocal canvas
                form = await request.form
                files = await request.files

                body_data = {}

                for key, value in form.items():
                    body_data[key] = value

                if len(files) > 10:
                    raise Exception("Too many uploaded files")
                for key, file in files.items():
                    desc = FileService.upload_info(
                        cvs.user_id,           # user
                        file,              # FileStorage
                        None                   # url (None for webhook)
                    )
                    file_parsed= await canvas.get_files_async([desc])
                    body_data[key] = file_parsed

            elif ctype == "application/x-www-form-urlencoded":
                form = await request.form
                body_data = dict(form)

            else:
                # text/plain / octet-stream / empty / unknown
                raw = await request.get_data()
                if raw:
                    try:
                        body_data = json.loads(raw.decode("utf-8"))
                    except Exception:
                        body_data = {}
                else:
                    body_data = {}

        except Exception:
            body_data = {}

        return {
            "query": query_data,
            "headers": header_data,
            "body": body_data,
            "content_type": ctype,
        }

    def extract_by_schema(data, schema, name="section"):
        """
        Extract only fields defined in schema.
        Required fields must exist.
        Optional fields default to type-based default values.
        Type validation included.
        """
        props = schema.get("properties", {})
        required = schema.get("required", [])

        extracted = {}

        for field, field_schema in props.items():
            field_type = field_schema.get("type")

            # 1. Required field missing
            if field in required and field not in data:
                raise Exception(f"{name} missing required field: {field}")

            # 2. Optional → default value
            if field not in data:
                extracted[field] = default_for_type(field_type)
                continue

            raw_value = data[field]

            # 3. Auto convert value
            try:
                value = auto_cast_value(raw_value, field_type)
            except Exception as e:
                raise Exception(f"{name}.{field} auto-cast failed: {str(e)}")

            # 4. Type validation
            if not validate_type(value, field_type):
                raise Exception(
                    f"{name}.{field} type mismatch: expected {field_type}, got {type(value).__name__}"
                )

            extracted[field] = value

        return extracted


    def default_for_type(t):
        """Return default value for the given schema type."""
        if t == "file":
            return []
        if t == "object":
            return {}
        if t == "boolean":
            return False
        if t == "number":
            return 0
        if t == "string":
            return ""
        if t and t.startswith("array"):
            return []
        if t == "null":
            return None
        return None

    def auto_cast_value(value, expected_type):
        """Convert string values into schema type when possible."""

        # Non-string values already good
        if not isinstance(value, str):
            return value

        v = value.strip()

        # Boolean
        if expected_type == "boolean":
            if v.lower() in ["true", "1"]:
                return True
            if v.lower() in ["false", "0"]:
                return False
            raise Exception(f"Cannot convert '{value}' to boolean")

        # Number
        if expected_type == "number":
            # integer
            if v.isdigit() or (v.startswith("-") and v[1:].isdigit()):
                return int(v)

            # float
            try:
                return float(v)
            except Exception:
                raise Exception(f"Cannot convert '{value}' to number")

        # Object
        if expected_type == "object":
            try:
                parsed = json.loads(v)
                if isinstance(parsed, dict):
                    return parsed
                else:
                    raise Exception("JSON is not an object")
            except Exception:
                raise Exception(f"Cannot convert '{value}' to object")

        # Array <T>
        if expected_type.startswith("array"):
            try:
                parsed = json.loads(v)
                if isinstance(parsed, list):
                    return parsed
                else:
                    raise Exception("JSON is not an array")
            except Exception:
                raise Exception(f"Cannot convert '{value}' to array")

        # String (accept original)
        if expected_type == "string":
            return value

        # File
        if expected_type == "file":
            return value
        # Default: do nothing
        return value


    def validate_type(value, t):
        """Validate value type against schema type t."""
        if t == "file":
            return isinstance(value, list)

        if t == "string":
            return isinstance(value, str)

        if t == "number":
            return isinstance(value, (int, float))

        if t == "boolean":
            return isinstance(value, bool)

        if t == "object":
            return isinstance(value, dict)

        # array<string> / array<number> / array<object>
        if t.startswith("array"):
            if not isinstance(value, list):
                return False

            if "<" in t and ">" in t:
                inner = t[t.find("<") + 1 : t.find(">")]

                # Check each element type
                for item in value:
                    if not validate_type(item, inner):
                        return False

            return True

        return True
    parsed = await parse_webhook_request(webhook_cfg.get("content_types"))
    SCHEMA = webhook_cfg.get("schema", {"query": {}, "headers": {}, "body": {}})

    # Extract strictly by schema
    try:
        query_clean  = extract_by_schema(parsed["query"],   SCHEMA.get("query", {}),  name="query")
        header_clean = extract_by_schema(parsed["headers"], SCHEMA.get("headers", {}), name="headers")
        body_clean   = extract_by_schema(parsed["body"],    SCHEMA.get("body", {}),    name="body")
    except Exception as e:
        return get_data_error_result(code=RetCode.BAD_REQUEST,message=str(e)),RetCode.BAD_REQUEST

    clean_request = {
        "query": query_clean,
        "headers": header_clean,
        "body": body_clean,
        "input": parsed
    }

    execution_mode = webhook_cfg.get("execution_mode", "Immediately")
    response_cfg = webhook_cfg.get("response", {})

    def append_webhook_trace(agent_id: str, start_ts: float,event: dict, ttl=600):
        from rag.utils.redis_conn import REDIS_CONN

        key = f"webhook-trace-{agent_id}-logs"

        raw = REDIS_CONN.get(key)
        obj = json.loads(raw) if raw else {"webhooks": {}}

        ws = obj["webhooks"].setdefault(
            str(start_ts),
            {"start_ts": start_ts, "events": []}
        )

        ws["events"].append({
            "ts": time.time(),
            **event
        })

        REDIS_CONN.set_obj(key, obj, ttl)

    if execution_mode == "Immediately":
        status = response_cfg.get("status", 200)
        try:
            status = int(status)
        except (TypeError, ValueError):
            return get_data_error_result(code=RetCode.BAD_REQUEST,message=str(f"Invalid response status code: {status}")),RetCode.BAD_REQUEST

        if not (200 <= status <= 399):
            return get_data_error_result(code=RetCode.BAD_REQUEST,message=str(f"Invalid response status code: {status}, must be between 200 and 399")),RetCode.BAD_REQUEST

        body_tpl = response_cfg.get("body_template", "")

        def parse_body(body: str):
            if not body:
                return None, "application/json"

            try:
                parsed = json.loads(body)
                return parsed, "application/json"
            except (json.JSONDecodeError, TypeError):
                return body, "text/plain"


        body, content_type = parse_body(body_tpl)
        resp = Response(
            json.dumps(body, ensure_ascii=False) if content_type == "application/json" else body,
            status=status,
            content_type=content_type,
        )

        async def background_run():
            try:
                async for ans in canvas.run(
                    query="",
                    user_id=cvs.user_id,
                    webhook_payload=clean_request
                ):
                    if is_test:
                        append_webhook_trace(agent_id, start_ts, ans)

                if is_test:
                    append_webhook_trace(
                        agent_id,
                        start_ts,
                        {
                            "event": "finished",
                            "elapsed_time": time.time() - start_ts,
                            "success": True,
                        }
                    )

                cvs.dsl = json.loads(str(canvas))
                UserCanvasService.update_by_id(cvs.user_id, cvs.to_dict())

            except Exception as e:
                logging.exception("Webhook background run failed")
                if is_test:
                    try:
                        append_webhook_trace(
                            agent_id,
                            start_ts,
                            {
                                "event": "error",
                                "message": str(e),
                                "error_type": type(e).__name__,
                            }
                        )
                        append_webhook_trace(
                            agent_id,
                            start_ts,
                            {
                                "event": "finished",
                                "elapsed_time": time.time() - start_ts,
                                "success": False,
                            }
                        )
                    except Exception:
                        logging.exception("Failed to append webhook trace")

        task = asyncio.create_task(background_run())
        if isinstance(task, asyncio.Task):
            _background_tasks.add(task)
            task.add_done_callback(_background_tasks.discard)
        return resp
    else:
        async def sse():
            nonlocal canvas
            contents: list[str] = []
            status = 200
            try:
                async for ans in canvas.run(
                    query="",
                    user_id=cvs.user_id,
                    webhook_payload=clean_request,
                ):
                    if ans["event"] == "message":
                        content = ans["data"]["content"]
                        if ans["data"].get("start_to_think", False):
                            content = "<think>"
                        elif ans["data"].get("end_to_think", False):
                            content = "</think>"
                        if content:
                            contents.append(content)
                    if ans["event"] == "message_end":
                        status = int(ans["data"].get("status", status))
                    if is_test:
                        append_webhook_trace(
                            agent_id,
                            start_ts,
                            ans
                        )
                if is_test:
                    append_webhook_trace(
                        agent_id,
                        start_ts,
                        {
                            "event": "finished",
                            "elapsed_time": time.time() - start_ts,
                            "success": True,
                        }
                    )
                final_content = "".join(contents)
                return {
                    "message": final_content,
                    "success": True,
                    "code":  status,
                }

            except Exception as e:
                if is_test:
                    append_webhook_trace(
                        agent_id,
                        start_ts,
                        {
                            "event": "error",
                            "message": str(e),
                            "error_type": type(e).__name__,
                        }
                    )
                    append_webhook_trace(
                        agent_id,
                        start_ts,
                        {
                            "event": "finished",
                            "elapsed_time": time.time() - start_ts,
                            "success": False,
                        }
                    )
                return {"code": 400, "message": str(e),"success":False}

        result = await sse()
        return Response(
            json.dumps(result),
            status=result["code"],
            mimetype="application/json",
        )


@manager.route("/agents/<agent_id>/webhook/logs", methods=["GET"])  # noqa: F821
@login_required
async def webhook_trace(agent_id: str):
    exists, cvs = UserCanvasService.get_by_id(agent_id)
    if not exists or str(cvs.user_id) != str(current_user.id):
        return get_data_error_result(
            message="Canvas not found.",
        )

    def encode_webhook_id(start_ts: str) -> str:
        WEBHOOK_ID_SECRET = "webhook_id_secret"
        sig = hmac.new(
            WEBHOOK_ID_SECRET.encode("utf-8"),
            start_ts.encode("utf-8"),
            hashlib.sha256,
        ).digest()
        return base64.urlsafe_b64encode(sig).decode("utf-8").rstrip("=")

    def decode_webhook_id(enc_id: str, webhooks: dict) -> str | None:
        for ts in webhooks.keys():
            if encode_webhook_id(ts) == enc_id:
                return ts
        return None
    since_ts = request.args.get("since_ts", type=float)
    webhook_id = request.args.get("webhook_id")

    key = f"webhook-trace-{agent_id}-logs"
    from rag.utils.redis_conn import REDIS_CONN

    raw = REDIS_CONN.get(key)

    if since_ts is None:
        now = time.time()
        return get_json_result(
            data={
                "webhook_id": None,
                "events": [],
                "next_since_ts": now,
                "finished": False,
            }
        )

    if not raw:
        return get_json_result(
            data={
                "webhook_id": None,
                "events": [],
                "next_since_ts": since_ts,
                "finished": False,
            }
        )

    obj = json.loads(raw)
    webhooks = obj.get("webhooks", {})

    if webhook_id is None:
        candidates = [
            float(k) for k in webhooks.keys() if float(k) > since_ts
        ]

        if not candidates:
            return get_json_result(
                data={
                    "webhook_id": None,
                    "events": [],
                    "next_since_ts": since_ts,
                    "finished": False,
                }
            )

        start_ts = min(candidates)
        real_id = str(start_ts)
        webhook_id = encode_webhook_id(real_id)

        return get_json_result(
            data={
                "webhook_id": webhook_id,
                "events": [],
                "next_since_ts": start_ts,
                "finished": False,
            }
        )

    real_id = decode_webhook_id(webhook_id, webhooks)

    if not real_id:
        return get_json_result(
            data={
                "webhook_id": webhook_id,
                "events": [],
                "next_since_ts": since_ts,
                "finished": True,
            }
        )

    ws = webhooks.get(str(real_id))
    events = ws.get("events", [])
    new_events = [e for e in events if e.get("ts", 0) > since_ts]

    next_ts = since_ts
    for e in new_events:
        next_ts = max(next_ts, e["ts"])

    finished = any(e.get("event") == "finished" for e in new_events)

    return get_json_result(
        data={
            "webhook_id": webhook_id,
            "events": new_events,
            "next_since_ts": next_ts,
            "finished": finished,
        }
    )

@manager.route("/agents/attachments/<attachment_id>/download", methods=["GET"])  # noqa: F821
@login_required
@add_tenant_id_to_kwargs
async def download_attachment(tenant_id=None, attachment_id=None):
    """Stream a document's underlying file to the requesting user.

    Mirrors the authorization model of the preview endpoint: the user must belong
    to the tenant that owns the document's knowledge base. A denial returns the
    same "Attachment not found!" response so the endpoint cannot be used to
    enumerate doc ids across tenants.
    """
    try:
        # Keep backward compatibility with older callers and unit tests that still
        # pass `attachment_id` instead of the route parameter name.
        ext = request.args.get("ext", "markdown")
        data = await thread_pool_exec(settings.STORAGE_IMPL.get, tenant_id, attachment_id)
        if not data:
            # Storage object missing or empty (orphaned DB metadata, tenant
            # mismatch). Without this guard `make_response(None)` raises
            # `TypeError: response value cannot be None` and the caller
            # sees HTTP 500 — same bug class as #15365 on document
            # preview. Return the same "Attachment not found!" shape used
            # by the preview route's missing-record path so byte-streaming
            # endpoints respond consistently on a not-found.
            return get_data_error_result(message="Attachment not found!")
        response = await make_response(data)
        content_type = CONTENT_TYPE_MAP.get(ext, f"application/{ext}")
        apply_safe_file_response_headers(response, content_type, ext)

        return response

    except Exception as e:
        return server_error_response(e)
