from fastapi import APIRouter, Depends, HTTPException, status
from .models import UserInDb, Role, Token, UserPublic, UserBase
from .models import get_current_active_user, authenticate_user, create_access_token,get_current_user
from datetime import timedelta, datetime, timezone
from ..auth.models import get_password_hash, verify_password
from ..config import ACCESS_TOKEN_EXPIRE_MINUTES
from typing import Annotated, Optional
from sqlmodel import Session
from ..config import get_session_db
from fastapi import Depends
from fastapi.security import OAuth2PasswordRequestForm
from .models import UserCreate, DBUser


router = APIRouter(
    prefix="/auth",
    tags=["auth"],
    responses={404: {"description": "Not found"}},
    dependencies=[],
)

@router.get("/me")
async def read_users_me(
    current_user: Annotated[UserBase, Depends(get_current_active_user)],
) -> UserPublic:
    return current_user


def ADMIN(current_user: Annotated[UserInDb, Depends(get_current_user)]):
    if current_user.role != Role.admin:
        raise HTTPException(status_code=400, detail="You are not admin")
    return current_user


@router.get('/home')
async def home(current_user : Annotated[UserBase, Depends(ADMIN)]):
    return {"message" : f"Welcome to home page {current_user.username}"}

@router.post('/login')
async def login_for_access_token(
    form_data : Annotated[OAuth2PasswordRequestForm, Depends()],
    session : Annotated[Session, Depends(get_session_db)],
) -> Token:
    
    user = authenticate_user(session, 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"},
        )
    access_token_expires = timedelta(minutes=30)
    access_token = create_access_token(
        data={"sub": user.username, "role": user.role, 'status': user.status}, expires_delta=access_token_expires
    )
    return Token(access_token=access_token, token_type="bearer")


@router.post('/register', response_model=UserPublic)
async def create_user(
        session : Annotated[Session, Depends(get_session_db)],
        user : Annotated[UserCreate, Depends()]
):
    user_dict = user.dict()
    print(user.password)
    user_dict['hashed_password'] = get_password_hash(user.password)
    print (user_dict['hashed_password'])

    if not verify_password(user.password, user_dict['hashed_password']):
        raise HTTPException(status_code=400, detail="Password hashing failed")
    
    db_user = DBUser.model_validate(user_dict)
    session.add(db_user)
    session.commit()
    session.refresh(db_user)
    return db_user