"""自定义工具模块路由。

提供自定义工具的创建、管理、导入和执行功能。
支持从 OpenAPI 规范自动导入工具定义，以及手动创建自定义 HTTP 工具。
"""
import uuid
import httpx
from fastapi import APIRouter, Depends, HTTPException, Request
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
from database import get_db
from models import CustomTool
from schemas import CustomToolCreate, CustomToolUpdate, CustomToolOut, OpenAPIImportRequest
from modules.custom_tool.parser import OpenAPIParser
from modules.custom_tool.executor import CustomToolExecutor
from modules.flow_engine.engine import ToolNodeAgent
from dependencies import get_current_user
import logging

logger = logging.getLogger(__name__)  # 当前模块的日志记录器

router = APIRouter(prefix="/api/custom-tools", tags=["custom_tools"])


@router.post("/import-openapi")
async def import_openapi(req: OpenAPIImportRequest, request: Request, db: AsyncSession = Depends(get_db)):
    """从 OpenAPI 规范 URL 导入工具定义。

    自动下载 OpenAPI 文档，解析其中的 API 端点并创建对应的自定义工具。

    Args:
        req: OpenAPI 导入请求体，包含 openapi_url 和可选的 base_url_override。
        request: HTTP 请求对象。
        db: 异步数据库会话。

    Returns:
        dict: 包含导入成功工具列表的响应数据。

    Raises:
        HTTPException: 获取 OpenAPI 文档失败或解析不到工具时抛出异常。
    """
    user_ctx = request.state.user
    try:
        async with httpx.AsyncClient(timeout=30) as client:
            resp = await client.get(req.openapi_url)
            resp.raise_for_status()
            spec = resp.json()  # 解析 OpenAPI 规范 JSON
    except httpx.HTTPError as e:
        raise HTTPException(400, f"获取 OpenAPI 文档失败: {e}")
    except ValueError:
        raise HTTPException(400, "OpenAPI 文档不是有效的 JSON 格式")

    parser = OpenAPIParser(spec)
    tools = parser.parse_tools()
    if not tools:
        raise HTTPException(400, "未能从 OpenAPI 文档中解析出任何工具")

    base_url = req.base_url_override or parser.base_url  # 优先使用用户指定的基础 URL
    if not base_url:
        raise HTTPException(400, "未能确定 API 基础 URL，请提供 base_url_override")

    created = []
    for t in tools:
        existing = await db.execute(
            select(CustomTool).where(CustomTool.name == t["name"])
        )
        if existing.scalar_one_or_none():
            continue  # 跳过已存在的同名工具

        tool = CustomTool(
            name=t["name"],
            description=t["description"],
            schema_json=t["parameters"],
            endpoint_url=base_url,
            method=t["method"],
            path=t["path"],
            created_by=uuid.UUID(user_ctx["id"]),
        )
        db.add(tool)
        created.append(t["name"])

        ToolNodeAgent.register_custom_tool(
            t["name"],
            t["parameters"],
            {
                "endpoint_url": base_url,
                "method": t["method"],
                "path": t["path"],
                "headers_json": {},
                "auth_type": "none",
                "auth_config": {},
                "timeout": 30,
            },
        )

    await db.flush()
    return {"code": 200, "message": f"成功导入 {len(created)} 个工具", "data": {"tools": created}}


@router.post("/", response_model=CustomToolOut)
async def create_custom_tool(req: CustomToolCreate, request: Request, db: AsyncSession = Depends(get_db)):
    """创建新的自定义工具，支持手动创建或从 OpenAPI 导入。

    Args:
        req: 自定义工具创建请求体。
        request: HTTP 请求对象。
        db: 异步数据库会话。

    Returns:
        CustomToolOut: 创建后的自定义工具响应。

    Raises:
        HTTPException: 获取 OpenAPI 文档失败或创建失败时抛出异常。
    """
    user_ctx = request.state.user
    user_id = uuid.UUID(user_ctx["id"])

    if req.openapi_url:
        try:
            async with httpx.AsyncClient(timeout=30) as client:
                resp = await client.get(req.openapi_url)
                resp.raise_for_status()
                spec = resp.json()
        except Exception as e:
            raise HTTPException(400, f"获取 OpenAPI 文档失败: {e}")

        parser = OpenAPIParser(spec)
        tools = parser.parse_tools()

        created_tool = None
        for t in tools:
            if t["name"] == req.name or (not req.name and tools):
                existing = await db.execute(
                    select(CustomTool).where(CustomTool.name == t["name"])
                )
                if existing.scalar_one_or_none():
                    continue
                tool = CustomTool(
                    name=t["name"],
                    description=t["description"],
                    schema_json=t["parameters"],
                    endpoint_url=parser.base_url,
                    method=t["method"],
                    path=t["path"],
                    created_by=user_id,
                )
                db.add(tool)
                created_tool = tool
                break

        if not created_tool:
            raise HTTPException(400, "未找到匹配的工具")

        await db.flush()
        return created_tool

    # 手动创建模式
    schema_json = req.tool_schema or {}
    if not schema_json and req.endpoint_url:
        schema_json = {
            "type": "object",
            "properties": {},
            "description": req.description or "",
        }

    tool = CustomTool(
        name=req.name,
        description=req.description,
        schema_json=schema_json,
        endpoint_url=req.endpoint_url or "",
        method=req.method,
        path=req.path,
        headers_json=req.headers,
        auth_type=req.auth_type,
        auth_config=req.auth_config,
        created_by=user_id,
    )
    db.add(tool)
    ToolNodeAgent.register_custom_tool(
        req.name,
        schema_json,
        {
            "endpoint_url": req.endpoint_url or "",
            "method": req.method,
            "path": req.path,
            "headers_json": req.headers,
            "auth_type": req.auth_type,
            "auth_config": req.auth_config,
            "timeout": 30,
        },
    )
    await db.flush()
    return tool


@router.get("/", response_model=list[CustomToolOut])
async def list_custom_tools(db: AsyncSession = Depends(get_db)):
    """列出所有处于活跃状态的自定义工具。

    Args:
        db: 异步数据库会话。

    Returns:
        list[CustomToolOut]: 活跃自定义工具列表。
    """
    result = await db.execute(
        select(CustomTool).where(CustomTool.is_active == True).order_by(CustomTool.updated_at.desc())
    )
    return result.scalars().all()


@router.get("/{tool_id}", response_model=CustomToolOut)
async def get_custom_tool(tool_id: uuid.UUID, db: AsyncSession = Depends(get_db)):
    """获取指定自定义工具的详细信息。

    Args:
        tool_id: 自定义工具唯一标识 ID。
        db: 异步数据库会话。

    Returns:
        CustomToolOut: 自定义工具详细信息。

    Raises:
        HTTPException: 工具不存在时抛出异常。
    """
    tool = await db.get(CustomTool, tool_id)
    if not tool:
        raise HTTPException(404, "工具不存在")
    return tool


@router.put("/{tool_id}", response_model=CustomToolOut)
async def update_custom_tool(tool_id: uuid.UUID, req: CustomToolUpdate, db: AsyncSession = Depends(get_db)):
    """更新自定义工具的配置信息。

    Args:
        tool_id: 自定义工具唯一标识 ID。
        req: 自定义工具更新请求体。
        db: 异步数据库会话。

    Returns:
        CustomToolOut: 更新后的自定义工具响应。

    Raises:
        HTTPException: 工具不存在时抛出异常。
    """
    tool = await db.get(CustomTool, tool_id)
    if not tool:
        raise HTTPException(404, "工具不存在")
    if req.name is not None:
        tool.name = req.name
    if req.description is not None:
        tool.description = req.description
    if req.endpoint_url is not None:
        tool.endpoint_url = req.endpoint_url
    if req.method is not None:
        tool.method = req.method
    if req.path is not None:
        tool.path = req.path
    if req.headers is not None:
        tool.headers_json = req.headers
    if req.auth_type is not None:
        tool.auth_type = req.auth_type
    if req.auth_config is not None:
        tool.auth_config = req.auth_config
    if req.tool_schema is not None:
        tool.schema_json = req.tool_schema
    if req.is_active is not None:
        tool.is_active = req.is_active
    await db.flush()
    return tool


@router.delete("/{tool_id}")
async def delete_custom_tool(tool_id: uuid.UUID, db: AsyncSession = Depends(get_db)):
    """删除（停用）自定义工具。

    采用软删除方式，将工具标记为非活跃状态而非真正删除。

    Args:
        tool_id: 自定义工具唯一标识 ID。
        db: 异步数据库会话。

    Returns:
        dict: 操作结果响应。

    Raises:
        HTTPException: 工具不存在时抛出异常。
    """
    tool = await db.get(CustomTool, tool_id)
    if not tool:
        raise HTTPException(404, "工具不存在")
    tool.is_active = False  # 软删除：标记为非活跃
    await db.flush()
    return {"code": 200, "message": "工具已停用"}


@router.post("/{tool_id}/test")
async def test_custom_tool(tool_id: uuid.UUID, params: dict = None, db: AsyncSession = Depends(get_db)):
    """测试执行自定义工具。

    使用自定义工具的配置信息创建执行器并执行，返回执行结果。

    Args:
        tool_id: 自定义工具唯一标识 ID。
        params: 测试参数，传递给工具执行的参数体。
        db: 异步数据库会话。

    Returns:
        dict: 包含执行结果的响应数据。

    Raises:
        HTTPException: 工具不存在或执行失败时抛出异常。
    """
    tool = await db.get(CustomTool, tool_id)
    if not tool:
        raise HTTPException(404, "工具不存在")
    if params is None:
        params = {}

    executor = CustomToolExecutor({
        "endpoint_url": tool.endpoint_url,
        "method": tool.method,
        "path": tool.path,
        "headers_json": tool.headers_json,
        "auth_type": tool.auth_type,
        "auth_config": tool.auth_config,
    })
    try:
        result = await executor.execute(params)
        return {"code": 200, "data": {"result": result}}
    except Exception as e:
        raise HTTPException(500, f"工具执行失败: {str(e)}")


@router.get("/schemas/all")
async def get_all_tool_schemas(db: AsyncSession = Depends(get_db)):
    """获取所有活跃自定义工具的参数 Schema。

    Args:
        db: 异步数据库会话。

    Returns:
        dict: 包含所有工具 Schema 的响应数据，格式为 {工具名: schema}。
    """
    result = await db.execute(
        select(CustomTool).where(CustomTool.is_active == True)
    )
    tools = result.scalars().all()
    schemas = {}
    for t in tools:
        schemas[t.name] = t.schema_json
    return {"code": 200, "data": schemas}