from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from pydantic import BaseModel
from typing import Optional
from uuid import UUID
from datetime import datetime
from app.database import get_db
from app.api.deps import get_current_user, require_role
from app.models.user import User
from app.utils.security import hash_password

router = APIRouter()


class UserResponse(BaseModel):
    id: UUID
    tenant_id: UUID
    email: str
    full_name: Optional[str]
    full_name_ar: Optional[str]
    role: str
    phone: Optional[str]
    is_active: bool
    last_login: Optional[datetime]
    created_at: datetime

    model_config = {"from_attributes": True}


class UserCreate(BaseModel):
    email: str
    password: str
    full_name: str
    full_name_ar: Optional[str] = None
    role: str = "agent"
    phone: Optional[str] = None


class UserUpdate(BaseModel):
    full_name: Optional[str] = None
    full_name_ar: Optional[str] = None
    role: Optional[str] = None
    phone: Optional[str] = None
    is_active: Optional[bool] = None


@router.get("", response_model=list[UserResponse])
async def list_users(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(User).where(User.tenant_id == current_user.tenant_id).order_by(User.created_at))
    return [UserResponse.model_validate(u) for u in result.scalars().all()]


@router.post("", response_model=UserResponse, status_code=201)
async def create_user(
    data: UserCreate,
    current_user: User = Depends(require_role("owner", "admin", "manager")),
    db: AsyncSession = Depends(get_db),
):
    existing = await db.execute(select(User).where(User.email == data.email, User.tenant_id == current_user.tenant_id))
    if existing.scalar_one_or_none():
        raise HTTPException(status_code=400, detail="Email already exists in this company")

    user = User(
        tenant_id=current_user.tenant_id,
        email=data.email,
        password_hash=hash_password(data.password),
        full_name=data.full_name,
        full_name_ar=data.full_name_ar,
        role=data.role,
        phone=data.phone,
    )
    db.add(user)
    await db.flush()
    await db.refresh(user)
    return UserResponse.model_validate(user)


@router.put("/{user_id}", response_model=UserResponse)
async def update_user(
    user_id: UUID,
    data: UserUpdate,
    current_user: User = Depends(require_role("owner", "admin")),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(User).where(User.id == user_id, User.tenant_id == current_user.tenant_id))
    user = result.scalar_one_or_none()
    if not user:
        raise HTTPException(status_code=404, detail="User not found")

    for field, value in data.model_dump(exclude_none=True).items():
        setattr(user, field, value)

    await db.flush()
    await db.refresh(user)
    return UserResponse.model_validate(user)


@router.delete("/{user_id}", status_code=204)
async def delete_user(
    user_id: UUID,
    current_user: User = Depends(require_role("owner", "admin")),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(User).where(User.id == user_id, User.tenant_id == current_user.tenant_id))
    user = result.scalar_one_or_none()
    if not user:
        raise HTTPException(status_code=404, detail="User not found")
    if user.id == current_user.id:
        raise HTTPException(status_code=400, detail="Cannot delete yourself")

    user.is_active = False
    await db.flush()