import uuid
from typing import Optional
from fastapi import APIRouter, Depends, HTTPException, Query
from pydantic import BaseModel
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from app.database import get_db
from app.middleware.auth import get_current_user, require_director
from app.models.user import User
from app.schemas.customer import UserOut

router = APIRouter(prefix="/users", tags=["Users"])


class UpdateUserRoleRequest(BaseModel):
    role: str  # manager / director / leader
    department: str = ""
    require_report: bool = True
    color: Optional[str] = None  # hex color for manager tags


@router.get("/", response_model=list[UserOut])
async def list_users(
    role: Optional[str] = Query(None),
    current_user: dict = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """List all users. Used for companion selection, assignment, etc."""
    query = select(User)
    if role:
        query = query.where(User.role == role)
    query = query.order_by(User.name)
    result = await db.execute(query)
    return result.scalars().all()


@router.get("/me")
async def get_current_user_info(
    current_user: dict = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Get current user's full profile."""
    result = await db.execute(select(User).where(User.id == uuid.UUID(current_user["user_id"])))
    user = result.scalar_one_or_none()
    if not user:
        raise HTTPException(status_code=404, detail="User not found")
    return {
        "id": str(user.id),
        "casdoor_id": user.casdoor_id,
        "name": user.name,
        "role": user.role,
        "department": user.department,
        "wecom_userid": user.wecom_userid,
    }


@router.put("/{user_id}/role")
async def update_user_role(
    user_id: str,
    data: UpdateUserRoleRequest,
    current_user: dict = Depends(require_director),
    db: AsyncSession = Depends(get_db),
):
    """Director updates a user's role. Only director can do this."""
    if data.role not in ("manager", "director", "leader"):
        raise HTTPException(status_code=400, detail="Invalid role. Must be manager/director/leader")

    result = await db.execute(select(User).where(User.id == uuid.UUID(user_id)))
    user = result.scalar_one_or_none()
    if not user:
        raise HTTPException(status_code=404, detail="User not found")

    user.role = data.role
    if data.department:
        user.department = data.department
    user.require_report = data.require_report
    if data.color is not None:
        user.color = data.color
    await db.commit()
    await db.refresh(user)

    return {
        "id": str(user.id),
        "name": user.name,
        "role": user.role,
        "department": user.department,
        "require_report": user.require_report,
        "color": user.color,
    }


class UpdateWecomRequest(BaseModel):
    wecom_userid: Optional[str] = None  # None or "" to unbind


@router.put("/{user_id}/wecom")
async def update_user_wecom(
    user_id: str,
    data: UpdateWecomRequest,
    current_user: dict = Depends(require_director),
    db: AsyncSession = Depends(get_db),
):
    """Director binds or unbinds a user's WeChat Work account."""
    result = await db.execute(select(User).where(User.id == uuid.UUID(user_id)))
    user = result.scalar_one_or_none()
    if not user:
        raise HTTPException(status_code=404, detail="User not found")

    new_id = (data.wecom_userid or "").strip()

    # Check duplicate
    if new_id:
        dup = await db.execute(
            select(User).where(User.wecom_userid == new_id, User.id != uuid.UUID(user_id))
        )
        existing = dup.scalar_one_or_none()
        if existing:
            raise HTTPException(status_code=400, detail=f"该企微ID已被「{existing.name}」绑定")

    user.wecom_userid = new_id if new_id else None
    await db.commit()
    await db.refresh(user)

    return {
        "id": str(user.id),
        "name": user.name,
        "wecom_userid": user.wecom_userid,
    }


@router.delete("/{user_id}")
async def delete_user(
    user_id: str,
    current_user: dict = Depends(require_director),
    db: AsyncSession = Depends(get_db),
):
    """Director deletes a user. Cannot delete self."""
    if user_id == current_user["user_id"]:
        raise HTTPException(status_code=400, detail="不能删除自己")

    result = await db.execute(select(User).where(User.id == uuid.UUID(user_id)))
    user = result.scalar_one_or_none()
    if not user:
        raise HTTPException(status_code=404, detail="User not found")

    await db.delete(user)
    await db.commit()
    return {"detail": "deleted", "name": user.name}