from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordRequestForm
from auth import authenticate_user, get_current_user
from custom_auth import (
    create_token_for_user,
    get_current_user_from_token,
    get_token,
    remove_token,
)
from models import Token, UserCreate, User
from database import get_users, create_account

router = APIRouter()

@router.post("/token", response_model=Token)
async def login_for_access_token(form_data: OAuth2PasswordRequestForm = Depends()):
    """
    Endpoint to get an access token using username and password
    """
    user = authenticate_user(get_users(), 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"},
        )

    # Create a new token for the user (this will remove any existing token)
    access_token = create_token_for_user(user.username)

    return Token(access_token=access_token, token_type="bearer")


@router.post("/register")
async def register_user(user_data: UserCreate):
    """
    Endpoint to register a new account
    """
    success, message = create_account(user_data.username, user_data.password)
    if not success:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=message)
    return {"message": message}


@router.post("/logout")
async def logout(
    current_user: User = Depends(get_current_user_from_token),
    token: str = Depends(get_token),
):
    """
    Endpoint to logout (invalidate the current token)
    """
    success = remove_token(token)
    if success:
        return {"message": "Logout successful"}
    else:
        return {"message": "Token already invalid or expired"}


@router.get("/me")
async def get_current_user_info(
    current_user: User = Depends(get_current_user_from_token),
):
    """
    Get the current user's information
    """
    return {
        "username": current_user.username,
        "email": current_user.email,
        "full_name": current_user.full_name,
    }