from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordRequestForm
from sqlalchemy.orm import Session
from datetime import timedelta
from app.db.session import get_db
from app.services.user_service import UserService
from app.schemas.user import UserCreate, User, Token, UserLogin
from app.core.security import create_access_token
from app.core.config import settings

router = APIRouter()


@router.post("/register", response_model=User, status_code=status.HTTP_201_CREATED)
def register(user_data: UserCreate, db: Session = Depends(get_db)):
    user_service = UserService(db)

    existing_user = user_service.get_user_by_email(user_data.email)
    if existing_user:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail="Email already registered"
        )

    user = user_service.create_user(user_data)
    return user


@router.post("/login", response_model=Token)
def login(user_data: UserLogin, db: Session = Depends(get_db)):
    user_service = UserService(db)

    user = user_service.authenticate_user(user_data.email, user_data.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect email or password",
            headers={"WWW-Authenticate": "Bearer"},
        )

    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(
        data={"sub": user.email}, expires_delta=access_token_expires
    )

    return {"access_token": access_token, "token_type": "bearer"}


@router.post("/token", response_model=Token)
def login_for_access_token(
    form_data: OAuth2PasswordRequestForm = Depends(), db: Session = Depends(get_db)
):
    user_service = UserService(db)

    user = user_service.authenticate_user(form_data.username, form_data.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect email or password",
            headers={"WWW-Authenticate": "Bearer"},
        )

    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(
        data={"sub": user.email}, expires_delta=access_token_expires
    )

    return {"access_token": access_token, "token_type": "bearer"}