from datetime import timedelta
from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordRequestForm
from sqlalchemy.orm import Session
from database import get_db
from schemas import UserCreate, UserResponse, Token
from auth import (
    authenticate_user,
    create_access_token,
    create_user,
    get_current_active_user
)
from config import get_settings
from models import User

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


@router.post("/register", response_model=UserResponse, status_code=status.HTTP_201_CREATED)
async def register(user_data: UserCreate, db: Session = Depends(get_db)):
    """Регистрация нового пользователя"""
    user = create_user(
        db=db,
        username=user_data.username,
        email=user_data.email,
        password=user_data.password
    )
    return user


@router.post("/login", response_model=Token)
async def login(
    form_data: OAuth2PasswordRequestForm = Depends(),
    db: Session = Depends(get_db)
):
    """Вход в систему"""
    user = authenticate_user(db, form_data.username, form_data.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )
    
    # Обновление времени последнего входа
    from datetime import datetime
    user.last_login = datetime.utcnow()
    db.commit()
    
    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(
        data={"sub": user.username}, expires_delta=access_token_expires
    )
    return {"access_token": access_token, "token_type": "bearer"}


@router.get("/me", response_model=UserResponse)
async def read_users_me(current_user: User = Depends(get_current_active_user)):
    """Получение информации о текущем пользователе"""
    return current_user


@router.post("/logout")
async def logout(current_user: User = Depends(get_current_active_user)):
    """Выход из системы"""
    return {"message": "Successfully logged out"}