import logging
from datetime import timedelta

from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordRequestForm
from sqlalchemy.orm import Session

from app.core.config import settings
from app.core.database import get_db
from app.core.security import create_access_token, get_password_hash
from app.dependencies.auth import authenticate_user, get_current_active_user
from app.models.user import User, UserRole
from app.schemas.user import Token, UserCreate
from app.schemas.user import User as UserSchema

router = APIRouter()
logger = logging.getLogger(__name__)

@router.post("/login", response_model=Token)
async def login(
    form_data: OAuth2PasswordRequestForm = Depends(),
    db: Session = Depends(get_db)
):
    """
    OAuth2 compatible token login, get an access token for future requests.
    """
    user = authenticate_user(db, 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(
        subject=user.id, expires_delta=access_token_expires
    )

    logger.info(f"User {user.email} logged in successfully")
    return {"access_token": access_token, "token_type": "bearer"}

@router.post("/register", response_model=UserSchema)
async def register(
    user_in: UserCreate,
    db: Session = Depends(get_db)
):
    """
    Register a new user.
    """
    # Check if user with this email already exists
    user = db.query(User).filter(User.email == user_in.email).first()
    if user:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="A user with this email already exists",
        )

    # Create new user
    db_user = User(
        email=user_in.email,
        hashed_password=get_password_hash(user_in.password),
        first_name=user_in.first_name,
        last_name=user_in.last_name,
        phone_number=user_in.phone_number,
        role=UserRole.CUSTOMER,
        is_active=True,
    )

    db.add(db_user)
    db.commit()
    db.refresh(db_user)

    logger.info(f"New user registered with email: {db_user.email}")
    return db_user

@router.post("/register/seller", response_model=UserSchema)
async def register_seller(
    user_in: UserCreate,
    db: Session = Depends(get_db)
):
    """
    Register a new seller account.
    """
    # Check if user with this email already exists
    user = db.query(User).filter(User.email == user_in.email).first()
    if user:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="A user with this email already exists",
        )

    # Create new seller user
    db_user = User(
        email=user_in.email,
        hashed_password=get_password_hash(user_in.password),
        first_name=user_in.first_name,
        last_name=user_in.last_name,
        phone_number=user_in.phone_number,
        role=UserRole.SELLER,
        is_active=True,
    )

    db.add(db_user)
    db.commit()
    db.refresh(db_user)

    logger.info(f"New seller registered with email: {db_user.email}")
    return db_user

@router.get("/me", response_model=UserSchema)
async def read_users_me(
    current_user: User = Depends(get_current_active_user)
):
    """
    Get current user information.
    """
    return current_user