#!/usr/bin/env python
#
# Copyright (C) 2020 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
API routes for users.
"""

from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordRequestForm
from uuid import UUID
from typing import List

from gns3server import schemas
from gns3server.controller.controller_error import (
    ControllerBadRequestError,
    ControllerNotFoundError,
    ControllerUnauthorizedError
)

from gns3server.db.repositories.users import UsersRepository
from gns3server.services import auth_service

from .dependencies.authentication import get_current_active_user
from .dependencies.database import get_repository

import logging
log = logging.getLogger(__name__)

router = APIRouter()


@router.get("", response_model=List[schemas.User])
async def get_users(user_repo: UsersRepository = Depends(get_repository(UsersRepository))) -> List[schemas.User]:
    """
    Get all users.
    """

    users = await user_repo.get_users()
    return users


@router.post("", response_model=schemas.User, status_code=status.HTTP_201_CREATED)
async def create_user(
        new_user: schemas.UserCreate,
        user_repo: UsersRepository = Depends(get_repository(UsersRepository))
) -> schemas.User:
    """
    Create a new user.
    """

    if await user_repo.get_user_by_username(new_user.username):
        raise ControllerBadRequestError(f"Username '{new_user.username}' is already registered")

    if new_user.email and await user_repo.get_user_by_email(new_user.email):
        raise ControllerBadRequestError(f"Email '{new_user.email}' is already registered")

    return await user_repo.create_user(new_user)


@router.get("/{user_id}", response_model=schemas.User)
async def get_user(
        user_id: UUID,
        user_repo: UsersRepository = Depends(get_repository(UsersRepository))
) -> schemas.User:
    """
    Get an user.
    """

    user = await user_repo.get_user(user_id)
    if not user:
        raise ControllerNotFoundError(f"User '{user_id}' not found")
    return user


@router.put("/{user_id}", response_model=schemas.User)
async def update_user(
        user_id: UUID,
        update_user: schemas.UserUpdate,
        user_repo: UsersRepository = Depends(get_repository(UsersRepository))
) -> schemas.User:
    """
    Update an user.
    """

    user = await user_repo.update_user(user_id, update_user)
    if not user:
        raise ControllerNotFoundError(f"User '{user_id}' not found")
    return user


@router.delete("/{user_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_user(
        user_id: UUID,
        user_repo: UsersRepository = Depends(get_repository(UsersRepository)),
        current_user: schemas.User = Depends(get_current_active_user)
) -> None:
    """
    Delete an user.
    """

    if current_user.is_superuser:
        raise ControllerUnauthorizedError("The super user cannot be deleted")

    success = await user_repo.delete_user(user_id)
    if not success:
        raise ControllerNotFoundError(f"User '{user_id}' not found")


@router.post("/login", response_model=schemas.Token)
async def login(
        user_repo: UsersRepository = Depends(get_repository(UsersRepository)),
        form_data: OAuth2PasswordRequestForm = Depends()
) -> schemas.Token:
    """
    User login.
    """

    user = await user_repo.authenticate_user(username=form_data.username, password=form_data.password)
    if not user:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED,
                            detail="Authentication was unsuccessful.",
                            headers={"WWW-Authenticate": "Bearer"})

    token = schemas.Token(access_token=auth_service.create_access_token(user.username), token_type="bearer")
    return token


@router.get("/users/me/", response_model=schemas.User)
async def get_current_active_user(current_user: schemas.User = Depends(get_current_active_user)) -> schemas.User:
    """
    Get the current active user.
    """

    return current_user