"""Tool: ``update_finding``. Mutate an existing finding by id."""

from __future__ import annotations

import asyncio
from typing import Any

from langgraph.config import get_config

from ..reviewer_findings import (
    MAX_SUGGESTION_LINES,
    clip_suggestion,
    get_thread_id_from_runtime,
    update_finding_fields,
)


def update_finding(
    finding_id: str,
    status: str | None = None,
    severity: str | None = None,
    confidence: str | None = None,
    description: str | None = None,
    suggestion: str | None = None,
    note: str | None = None,
) -> dict[str, Any]:
    """Update fields on an existing finding.

    Use this on a re-review run to mark an existing finding as resolved or
    dismissed, or to revise its severity/description/suggestion if the new
    commits changed the situation.

    Args:
        finding_id: The id returned by ``add_finding`` (or shown in the
            ``Existing findings`` block of the re-review user message).
        status: New status (``open``, ``resolved``, ``dismissed``).
            Use ``resolved`` when the new commits address the issue.
        severity: New severity, if reassessing.
        confidence: New confidence rating (``low``, ``medium``, ``high``), if
            new commits change how sure you are the finding is a real issue.
        description: New description body, if revising.
        suggestion: New replacement text. Pass an empty string to clear it.
            Capped at 4 lines — longer values are dropped (the finding keeps
            its description). Only set this for small, obvious fixes.
        note: Optional free-form note explaining the change. Persisted on the
            finding under ``last_update_note``.

    Returns:
        Dictionary with ``success`` and (on success) the updated ``finding``.
    """
    if status is not None and status not in {"open", "resolved", "dismissed"}:
        return {"success": False, "error": f"Invalid status: {status}"}
    if severity is not None and severity not in {"low", "medium", "high", "critical"}:
        return {"success": False, "error": f"Invalid severity: {severity}"}
    if confidence is not None and confidence not in {"low", "medium", "high"}:
        return {"success": False, "error": f"Invalid confidence: {confidence}"}

    updates: dict[str, Any] = {}
    suggestion_dropped = False
    if status is not None:
        updates["status"] = status
    if severity is not None:
        updates["severity"] = severity
    if confidence is not None:
        updates["confidence"] = confidence
    if description is not None:
        updates["description"] = description
    if suggestion is not None:
        if suggestion == "":
            updates["suggestion"] = None
        else:
            clipped, suggestion_dropped = clip_suggestion(suggestion)
            if not suggestion_dropped:
                updates["suggestion"] = clipped
    if note is not None:
        updates["last_update_note"] = note

    config = get_config()
    configurable = config.get("configurable", {}) if isinstance(config, dict) else {}
    head_sha = configurable.get("head_sha", "") if isinstance(configurable, dict) else ""
    if status == "open" and isinstance(head_sha, str) and head_sha:
        updates["last_confirmed_sha"] = head_sha

    if not updates:
        if suggestion_dropped:
            return {
                "success": False,
                "suggestion_dropped": True,
                "error": (
                    f"Suggestion exceeded the {MAX_SUGGESTION_LINES}-line cap "
                    "and was rejected; no other fields were provided, so "
                    "nothing was updated. Only include `suggestion` for "
                    "small, obvious fixes."
                ),
            }
        return {"success": False, "error": "No fields provided to update"}

    thread_id = get_thread_id_from_runtime()
    updated = asyncio.run(update_finding_fields(thread_id, finding_id, updates))
    if updated is None:
        return {"success": False, "error": f"No finding found with id {finding_id}"}
    result: dict[str, Any] = {"success": True, "finding": updated}
    if suggestion_dropped:
        result["suggestion_dropped"] = True
        result["warning"] = (
            f"Suggestion exceeded the {MAX_SUGGESTION_LINES}-line cap and was "
            "rejected — the finding's prior `suggestion` was left unchanged "
            "and other fields were updated normally. Only include "
            "`suggestion` for small, obvious fixes."
        )
    return result
