import uuid
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 User, ChatSession, ChatMessage, AgentConfig
from schemas import AgentConfigCreate, AgentConfigUpdate, AgentConfigOut
from agentscope_integration.factory import AgentFactory

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


@router.post("/chat/{agent_type}")
async def agent_chat(
    agent_type: str,
    request: Request,
    payload: dict,
    db: AsyncSession = Depends(get_db),
):
    user_ctx = request.state.user
    user_id = uuid.UUID(user_ctx["id"])
    msg_content = payload.get("message", "")
    session_id = payload.get("session_id", f"session_{uuid.uuid4().hex[:12]}")

    result = await db.execute(select(User).where(User.id == user_id))
    user = result.scalar_one_or_none()
    if not user:
        raise HTTPException(404, "用户不存在")

    session_result = await db.execute(
        select(ChatSession).where(ChatSession.session_id == session_id)
    )
    session = session_result.scalar_one_or_none()
    if not session:
        session = ChatSession(
            user_id=user.id, agent_type=agent_type,
            session_id=session_id,
        )
        db.add(session)
        await db.flush()

    user_msg = ChatMessage(
        session_id=session.id, user_id=user.id,
        role="user", content=msg_content,
    )
    db.add(user_msg)
    await db.flush()

    agent = await AgentFactory.create_agent(
        agent_type=agent_type,
        user_id=str(user.id),
        user_name=user.display_name,
        department_id=str(user.department_id) if user.department_id else None,
    )

    from agentscope.message import Msg
    input_msg = Msg(name="user", content=msg_content, role="user")
    response = await agent.reply(input_msg)

    reply_text = response.get_text_content() if hasattr(response, 'get_text_content') else str(response)

    ai_msg = ChatMessage(
        session_id=session.id, user_id=user.id,
        role="assistant", content=reply_text,
    )
    db.add(ai_msg)

    return {
        "code": 200,
        "data": {
            "session_id": session_id,
            "reply": reply_text,
            "role": "assistant",
        },
    }


@router.get("/list")
async def get_agent_list(request: Request, db: AsyncSession = Depends(get_db)):
    result = await db.execute(
        select(AgentConfig).where(AgentConfig.status == "active").order_by(AgentConfig.updated_at.desc())
    )
    agents = result.scalars().all()
    return {
        "code": 200,
        "data": [{
            "id": str(a.id),
            "name": a.name,
            "description": a.description,
            "system_prompt": a.system_prompt,
            "model": a.model,
            "temperature": float(a.temperature) / 10.0,
            "tools": a.tools or [],
            "status": a.status,
        } for a in agents],
    }


@router.post("/", response_model=AgentConfigOut)
async def create_agent(req: AgentConfigCreate, request: Request, db: AsyncSession = Depends(get_db)):
    user_ctx = request.state.user
    agent = AgentConfig(
        name=req.name,
        description=req.description,
        system_prompt=req.system_prompt,
        model=req.model,
        temperature=int(req.temperature * 10),
        tools=req.tools,
        creator_id=uuid.UUID(user_ctx["id"]),
    )
    db.add(agent)
    await db.flush()
    return AgentConfigOut(
        id=agent.id, name=agent.name, description=agent.description,
        system_prompt=agent.system_prompt, model=agent.model,
        temperature=float(agent.temperature) / 10.0,
        tools=agent.tools or [], status=agent.status,
        creator_id=agent.creator_id,
        created_at=agent.created_at, updated_at=agent.updated_at,
    )


@router.get("/{agent_id}", response_model=AgentConfigOut)
async def get_agent(agent_id: uuid.UUID, request: Request, db: AsyncSession = Depends(get_db)):
    result = await db.execute(select(AgentConfig).where(AgentConfig.id == agent_id))
    agent = result.scalar_one_or_none()
    if not agent:
        raise HTTPException(404, "Agent不存在")
    return AgentConfigOut(
        id=agent.id, name=agent.name, description=agent.description,
        system_prompt=agent.system_prompt, model=agent.model,
        temperature=float(agent.temperature) / 10.0,
        tools=agent.tools or [], status=agent.status,
        creator_id=agent.creator_id,
        created_at=agent.created_at, updated_at=agent.updated_at,
    )


@router.put("/{agent_id}", response_model=AgentConfigOut)
async def update_agent(agent_id: uuid.UUID, req: AgentConfigUpdate, request: Request, db: AsyncSession = Depends(get_db)):
    result = await db.execute(select(AgentConfig).where(AgentConfig.id == agent_id))
    agent = result.scalar_one_or_none()
    if not agent:
        raise HTTPException(404, "Agent不存在")
    if req.name is not None:
        agent.name = req.name
    if req.description is not None:
        agent.description = req.description
    if req.system_prompt is not None:
        agent.system_prompt = req.system_prompt
    if req.model is not None:
        agent.model = req.model
    if req.temperature is not None:
        agent.temperature = int(req.temperature * 10)
    if req.tools is not None:
        agent.tools = req.tools
    if req.status is not None:
        agent.status = req.status
    await db.flush()
    return AgentConfigOut(
        id=agent.id, name=agent.name, description=agent.description,
        system_prompt=agent.system_prompt, model=agent.model,
        temperature=float(agent.temperature) / 10.0,
        tools=agent.tools or [], status=agent.status,
        creator_id=agent.creator_id,
        created_at=agent.created_at, updated_at=agent.updated_at,
    )


@router.delete("/{agent_id}")
async def delete_agent(agent_id: uuid.UUID, request: Request, db: AsyncSession = Depends(get_db)):
    result = await db.execute(select(AgentConfig).where(AgentConfig.id == agent_id))
    agent = result.scalar_one_or_none()
    if not agent:
        raise HTTPException(404, "Agent不存在")
    await db.delete(agent)
    return {"code": 200, "message": "已删除"}


@router.get("/history/{session_id}")
async def get_chat_history(
    session_id: str,
    request: Request,
    db: AsyncSession = Depends(get_db),
):
    session_result = await db.execute(
        select(ChatSession).where(ChatSession.session_id == session_id)
    )
    session = session_result.scalar_one_or_none()
    if not session:
        raise HTTPException(404, "会话不存在")

    msg_result = await db.execute(
        select(ChatMessage).where(ChatMessage.session_id == session.id).order_by(ChatMessage.created_at)
    )
    messages = msg_result.scalars().all()

    return {
        "code": 200,
        "data": [{
            "role": m.role,
            "content": m.content,
            "created_at": str(m.created_at),
        } for m in messages],
    }