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 MCPService, AuditLog
from schemas import MCPServiceCreate, MCPServiceUpdate, MCPServiceOut
from dependencies import get_current_user

router = APIRouter(prefix="/api/mcp", tags=["mcp"])


@router.get("/servers", response_model=list[MCPServiceOut])
async def list_servers(request: Request, db: AsyncSession = Depends(get_db), user: dict = Depends(get_current_user)):
    result = await db.execute(
        select(MCPService).order_by(MCPService.updated_at.desc())
    )
    return result.scalars().all()


@router.get("/servers/{server_id}", response_model=MCPServiceOut)
async def get_server(server_id: uuid.UUID, request: Request, db: AsyncSession = Depends(get_db), user: dict = Depends(get_current_user)):
    result = await db.execute(select(MCPService).where(MCPService.id == server_id))
    server = result.scalar_one_or_none()
    if not server:
        raise HTTPException(404, "MCP服务不存在")
    return server


@router.post("/servers", response_model=MCPServiceOut)
async def register_server(
    req: MCPServiceCreate,
    request: Request,
    db: AsyncSession = Depends(get_db),
    user: dict = Depends(get_current_user),
):
    existing = await db.execute(select(MCPService).where(MCPService.name == req.name))
    if existing.scalar_one_or_none():
        raise HTTPException(400, "服务名称已存在")

    server = MCPService(
        name=req.name,
        transport=req.transport,
        url=req.url,
        command=req.command,
        args=req.args,
        env=req.env,
        creator_id=uuid.UUID(user["id"]),
    )
    db.add(server)

    audit = AuditLog(
        operator_id=uuid.UUID(user["id"]),
        action="mcp.register",
        resource="mcp_service",
        resource_id=req.name,
        detail={"name": req.name, "transport": req.transport},
        ip_address=request.client.host if request.client else None,
    )
    db.add(audit)

    await db.flush()
    return server


@router.put("/servers/{server_id}", response_model=MCPServiceOut)
async def update_server(
    server_id: uuid.UUID, req: MCPServiceUpdate,
    request: Request, db: AsyncSession = Depends(get_db),
    user: dict = Depends(get_current_user),
):
    result = await db.execute(select(MCPService).where(MCPService.id == server_id))
    server = result.scalar_one_or_none()
    if not server:
        raise HTTPException(404, "MCP服务不存在")

    if req.transport is not None:
        server.transport = req.transport
    if req.url is not None:
        server.url = req.url
    if req.command is not None:
        server.command = req.command
    if req.args is not None:
        server.args = req.args
    if req.env is not None:
        server.env = req.env

    audit = AuditLog(
        operator_id=uuid.UUID(user["id"]),
        action="mcp.update",
        resource="mcp_service",
        resource_id=str(server_id),
        ip_address=request.client.host if request.client else None,
    )
    db.add(audit)
    await db.flush()
    return server


@router.delete("/servers/{server_id}")
async def delete_server(
    server_id: uuid.UUID, request: Request,
    db: AsyncSession = Depends(get_db),
    user: dict = Depends(get_current_user),
):
    result = await db.execute(select(MCPService).where(MCPService.id == server_id))
    server = result.scalar_one_or_none()
    if not server:
        raise HTTPException(404, "MCP服务不存在")

    await db.delete(server)
    audit = AuditLog(
        operator_id=uuid.UUID(user["id"]),
        action="mcp.delete",
        resource="mcp_service",
        resource_id=str(server_id),
        detail={"name": server.name},
        ip_address=request.client.host if request.client else None,
    )
    db.add(audit)
    await db.flush()
    return {"code": 200, "message": "已注销"}


@router.post("/servers/{server_id}/test")
async def test_connection(
    server_id: uuid.UUID, request: Request,
    db: AsyncSession = Depends(get_db),
    user: dict = Depends(get_current_user),
):
    result = await db.execute(select(MCPService).where(MCPService.id == server_id))
    server = result.scalar_one_or_none()
    if not server:
        raise HTTPException(404, "MCP服务不存在")

    test_results = {"connectivity": False, "tools_discovered": 0, "tools": [], "error": None}

    if server.transport == "http" and server.url:
        try:
            async with httpx.AsyncClient(timeout=10.0) as client:
                resp = await client.get(server.url.rstrip("/") + "/.well-known/mcp")
                if resp.status_code == 200:
                    test_results["connectivity"] = True
                    data = resp.json()
                    tools = data.get("tools", [])
                    test_results["tools_discovered"] = len(tools)
                    test_results["tools"] = [{"name": t.get("name", ""), "description": t.get("description", "")} for t in tools]
                    server.tools = test_results["tools"]
                    server.status = "connected"
                else:
                    test_results["error"] = f"HTTP {resp.status_code}"
                    server.status = "error"
        except Exception as e:
            test_results["error"] = str(e)
            server.status = "error"

    audit = AuditLog(
        operator_id=uuid.UUID(user["id"]),
        action="mcp.test",
        resource="mcp_service",
        resource_id=str(server_id),
        detail={"name": server.name, "result": "connected" if test_results["connectivity"] else "failed"},
        ip_address=request.client.host if request.client else None,
    )
    db.add(audit)
    await db.flush()

    return {"code": 200, "data": test_results}


@router.post("/servers/{server_id}/discover-tools")
async def discover_tools(
    server_id: uuid.UUID, request: Request,
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(MCPService).where(MCPService.id == server_id))
    server = result.scalar_one_or_none()
    if not server:
        raise HTTPException(404, "MCP服务不存在")

    tools = []
    if server.transport == "http" and server.url:
        try:
            async with httpx.AsyncClient(timeout=10.0) as client:
                resp = await client.post(server.url.rstrip("/") + "/tools/list", json={})
                if resp.status_code == 200:
                    data = resp.json()
                    tools = data.get("tools", [])
                    server.tools = [{"name": t.get("name", ""), "description": t.get("description", ""), "inputSchema": t.get("inputSchema", {})} for t in tools]
                    server.status = "connected"
        except Exception as e:
            raise HTTPException(500, f"工具发现失败: {str(e)}")

    await db.flush()
    return {"code": 200, "data": {"tools": server.tools, "count": len(server.tools)}}