from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from ..core.security import create_access_token, verify_password, get_password_hash
from ..db.database import get_db
from ..db.models import User
from ..db.schemas import UserInDB
from datetime import timedelta
from typing import Any

router = APIRouter()
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

@router.post("/login")
async def login(
    form_data: OAuth2PasswordRequestForm = Depends(),
    db: AsyncSession = Depends(get_db)
) -> Any:
    stmt = select(User).where(User.email == form_data.username)
    result = await db.execute(stmt)
    user = result.scalar_one_or_none()
    
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect email or password",
        )
    
    if not verify_password(form_data.password, user.hashed_password):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect email or password",
        )
    
    access_token = create_access_token(user.id)
    return {"access_token": access_token, "token_type": "bearer"}

@router.post("/register", response_model=UserInDB)
async def register(
    user_data: OAuth2PasswordRequestForm = Depends(),
    db: AsyncSession = Depends(get_db)
) -> Any:
    # Check if user exists
    stmt = select(User).where(User.email == user_data.username)
    result = await db.execute(stmt)
    existing_user = result.scalar_one_or_none()
    
    if existing_user:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Email already registered",
        )
    
    # Create new user
    user = User(
        email=user_data.username,
        hashed_password=get_password_hash(user_data.password),
        full_name=user_data.username,  # You might want to add this as a separate field in the form
        username=user_data.username,
        is_active=True,
        is_superuser=False,
        roles=["user"]
    )
    
    db.add(user)
    await db.commit()
    await db.refresh(user)
    
    return user