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

from app.dependencies import get_db
from app.models.user import User
from app.schemas.user import UserCreate, Token, LoginRequest
from app.utils.security import hash_password, verify_password, create_token

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


@router.post("/register", response_model=Token, status_code=status.HTTP_201_CREATED)
async def register(body: UserCreate, db: AsyncSession = Depends(get_db)):
    result = await db.execute(select(User).where(User.email == body.email))
    if result.scalar_one_or_none():
        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Email already registered")

    user = User(
        email=body.email,
        password_hash=hash_password(body.password),
        display_name=body.display_name or body.email.split("@")[0],
    )
    db.add(user)
    await db.commit()
    await db.refresh(user)

    return Token(access_token=create_token(user.id))


@router.post("/login", response_model=Token)
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=status.HTTP_401_UNAUTHORIZED, detail="Invalid credentials")

    return Token(access_token=create_token(user.id))