import logging

from langchain.tools import BaseTool

from deerflow.config import get_app_config
from deerflow.config.app_config import AppConfig
from deerflow.reflection import resolve_variable
from deerflow.sandbox.security import is_host_bash_allowed
from deerflow.tools.builtins import ask_clarification_tool, present_file_tool, task_tool, view_image_tool
from deerflow.tools.builtins.tool_search import get_deferred_registry
from deerflow.tools.sync import make_sync_tool_wrapper

logger = logging.getLogger(__name__)

BUILTIN_TOOLS = [
    present_file_tool,
    ask_clarification_tool,
]

SUBAGENT_TOOLS = [
    task_tool,
    # task_status_tool is no longer exposed to LLM (backend handles polling internally)
]


def _is_host_bash_tool(tool: object) -> bool:
    """Return True if the tool config represents a host-bash execution surface."""
    group = getattr(tool, "group", None)
    use = getattr(tool, "use", None)
    if group == "bash":
        return True
    if use == "deerflow.sandbox.tools:bash_tool":
        return True
    return False


def _ensure_sync_invocable_tool(tool: BaseTool) -> BaseTool:
    """Attach a sync wrapper to async-only tools used by sync agent callers."""
    if getattr(tool, "func", None) is None and getattr(tool, "coroutine", None) is not None:
        tool.func = make_sync_tool_wrapper(tool.coroutine, tool.name)
    return tool


def get_available_tools(
    groups: list[str] | None = None,
    include_mcp: bool = True,
    model_name: str | None = None,
    subagent_enabled: bool = False,
    *,
    app_config: AppConfig | None = None,
) -> list[BaseTool]:
    """Get all available tools from config.

    Note: MCP tools should be initialized at application startup using
    `initialize_mcp_tools()` from deerflow.mcp module.

    Args:
        groups: Optional list of tool groups to filter by.
        include_mcp: Whether to include tools from MCP servers (default: True).
        model_name: Optional model name to determine if vision tools should be included.
        subagent_enabled: Whether to include subagent tools (task, task_status).

    Returns:
        List of available tools.
    """
    config = app_config or get_app_config()
    tool_configs = [tool for tool in config.tools if groups is None or tool.group in groups]

    # Do not expose host bash by default when LocalSandboxProvider is active.
    if not is_host_bash_allowed(config):
        tool_configs = [tool for tool in tool_configs if not _is_host_bash_tool(tool)]

    loaded_tools_raw = [(cfg, resolve_variable(cfg.use, BaseTool)) for cfg in tool_configs]

    # Warn when the config ``name`` field and the tool object's ``.name``
    # attribute diverge — this mismatch is the root cause of issue #1803 where
    # the LLM receives one name in its tool schema but the runtime router
    # recognises a different name, producing "not a valid tool" errors.
    for cfg, loaded in loaded_tools_raw:
        if cfg.name != loaded.name:
            logger.warning(
                "Tool name mismatch: config name %r does not match tool .name %r (use: %s). The tool's own .name will be used for binding.",
                cfg.name,
                loaded.name,
                cfg.use,
            )

    loaded_tools = [_ensure_sync_invocable_tool(t) for _, t in loaded_tools_raw]

    # Conditionally add tools based on config
    builtin_tools = BUILTIN_TOOLS.copy()
    skill_evolution_config = getattr(config, "skill_evolution", None)
    if getattr(skill_evolution_config, "enabled", False):
        from deerflow.tools.skill_manage_tool import skill_manage_tool

        builtin_tools.append(skill_manage_tool)

    # Add subagent tools only if enabled via runtime parameter
    if subagent_enabled:
        builtin_tools.extend(SUBAGENT_TOOLS)
        logger.info("Including subagent tools (task)")

    # If no model_name specified, use the first model (default)
    if model_name is None and config.models:
        model_name = config.models[0].name

    # Add view_image_tool only if the model supports vision
    model_config = config.get_model_config(model_name) if model_name else None
    if model_config is not None and model_config.supports_vision:
        builtin_tools.append(view_image_tool)
        logger.info(f"Including view_image_tool for model '{model_name}' (supports_vision=True)")

    # Get cached MCP tools if enabled
    # NOTE: We use ExtensionsConfig.from_file() instead of config.extensions
    # to always read the latest configuration from disk. This ensures that changes
    # made through the Gateway API (which runs in a separate process) are immediately
    # reflected when loading MCP tools.
    mcp_tools = []
    if include_mcp:
        try:
            from deerflow.config.extensions_config import ExtensionsConfig
            from deerflow.mcp.cache import get_cached_mcp_tools

            extensions_config = ExtensionsConfig.from_file()
            if extensions_config.get_enabled_mcp_servers():
                mcp_tools = get_cached_mcp_tools()
                if mcp_tools:
                    logger.info(f"Using {len(mcp_tools)} cached MCP tool(s)")

                    # When tool_search is enabled, register MCP tools in the
                    # deferred registry and add tool_search to builtin tools.
                    if config.tool_search.enabled:
                        from deerflow.tools.builtins.tool_search import DeferredToolRegistry, set_deferred_registry
                        from deerflow.tools.builtins.tool_search import tool_search as tool_search_tool

                        # Reuse the existing registry if one is already set for
                        # this async context. ``get_available_tools`` is
                        # re-entered whenever a subagent is spawned
                        # (``task_tool`` calls it to build the child agent's
                        # toolset), and previously we used to unconditionally
                        # rebuild the registry — wiping out the parent agent's
                        # tool_search promotions. The
                        # ``DeferredToolFilterMiddleware`` then re-hid those
                        # tools from subsequent model calls, leaving the agent
                        # able to see a tool's name but unable to invoke it
                        # (issue #2884). ``contextvars`` already gives us the
                        # lifetime semantics we want: a fresh request / graph
                        # run starts in a new asyncio task with the
                        # ContextVar at its default of ``None``, so reuse is
                        # only triggered for re-entrant calls inside one run.
                        #
                        # Intentionally NOT reconciling against the current
                        # ``mcp_tools`` snapshot. The MCP cache only refreshes
                        # on ``extensions_config.json`` mtime changes, which
                        # in practice happens between graph runs — not inside
                        # one. And even if a refresh did happen mid-run, the
                        # already-built lead agent's ``ToolNode`` still holds
                        # the *previous* tool set (LangGraph binds tools at
                        # graph construction time), so a brand-new MCP tool
                        # couldn't actually be invoked anyway. The
                        # ``DeferredToolRegistry`` doesn't retain the names
                        # of previously-promoted tools (``promote()`` drops
                        # the entry entirely), so re-syncing the registry
                        # against a fresh ``mcp_tools`` list would
                        # mis-classify those promotions as new tools and
                        # re-register them as deferred — exactly the bug
                        # this fix exists to prevent.
                        existing_registry = get_deferred_registry()
                        if existing_registry is None:
                            registry = DeferredToolRegistry()
                            for t in mcp_tools:
                                registry.register(t)
                            set_deferred_registry(registry)
                            logger.info(f"Tool search active: {len(mcp_tools)} tools deferred")
                        else:
                            mcp_tool_names = {t.name for t in mcp_tools}
                            still_deferred = len(existing_registry)
                            promoted_count = max(0, len(mcp_tool_names) - still_deferred)
                            logger.info(f"Tool search active (preserved promotions): {still_deferred} tools deferred, {promoted_count} already promoted")
                        builtin_tools.append(tool_search_tool)
        except ImportError:
            logger.warning("MCP module not available. Install 'langchain-mcp-adapters' package to enable MCP tools.")
        except Exception as e:
            logger.error(f"Failed to get cached MCP tools: {e}")

    # Add invoke_acp_agent tool if any ACP agents are configured
    acp_tools: list[BaseTool] = []
    try:
        from deerflow.tools.builtins.invoke_acp_agent_tool import build_invoke_acp_agent_tool

        if app_config is None:
            from deerflow.config.acp_config import get_acp_agents

            acp_agents = get_acp_agents()
        else:
            acp_agents = getattr(config, "acp_agents", {}) or {}
        if acp_agents:
            acp_tools.append(build_invoke_acp_agent_tool(acp_agents))
            logger.info(f"Including invoke_acp_agent tool ({len(acp_agents)} agent(s): {list(acp_agents.keys())})")
    except Exception as e:
        logger.warning(f"Failed to load ACP tool: {e}")

    logger.info(f"Total tools loaded: {len(loaded_tools)}, built-in tools: {len(builtin_tools)}, MCP tools: {len(mcp_tools)}, ACP tools: {len(acp_tools)}")

    # Deduplicate by tool name — config-loaded tools take priority, followed by
    # built-ins, MCP tools, and ACP tools.  Duplicate names cause the LLM to
    # receive ambiguous or concatenated function schemas (issue #1803).
    all_tools = loaded_tools + builtin_tools + mcp_tools + acp_tools
    seen_names: set[str] = set()
    unique_tools: list[BaseTool] = []
    for t in all_tools:
        if t.name not in seen_names:
            unique_tools.append(t)
            seen_names.add(t.name)
        else:
            logger.warning(
                "Duplicate tool name %r detected and skipped — check your config.yaml and MCP server registrations (issue #1803).",
                t.name,
            )
    return unique_tools
