from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select

from app.database import get_db
from app.models.user import User
from app.schemas.user import UserCreate, UserOut, TokenResponse, LoginRequest
from app.utils.auth import hash_password, verify_password, create_access_token, get_current_user

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


@router.post("/register", response_model=UserOut, status_code=status.HTTP_201_CREATED)
async def register(body: UserCreate, db: AsyncSession = Depends(get_db)):
    """Register a new user (admin-initiated in production)."""
    result = await db.execute(select(User).where(User.email == body.email))
    if result.scalar_one_or_none():
        raise HTTPException(status_code=400, detail="Email already registered")

    user = User(
        email=body.email,
        password_hash=hash_password(body.password),
        full_name=body.full_name,
        role=body.role,
    )
    db.add(user)
    await db.commit()
    await db.refresh(user)
    return user


@router.post("/login", response_model=TokenResponse)
async def login(body: LoginRequest, db: AsyncSession = Depends(get_db)):
    result = await db.execute(select(User).where(User.email == body.email))
    user = result.scalar_one_or_none()
    if not user or not verify_password(body.password, user.password_hash):
        raise HTTPException(status_code=401, detail="Invalid credentials")
    if not user.is_active:
        raise HTTPException(status_code=403, detail="Account disabled")

    token = create_access_token(str(user.id), user.role.value)
    return TokenResponse(access_token=token, user=UserOut.model_validate(user))


@router.get("/me", response_model=UserOut)
async def me(user: User = Depends(get_current_user)):
    return user