__author__ = "Florian Kaiser"
__copyright__ = "Copyright 2022, Project Aktienbot"
__credits__ = ["Florian Kaiser", "Florian Kellermann", "Linus Eickhof", "Kevin Pauer"]
__license__ = "GPL 3.0"
__version__ = "1.0.0"

import datetime
import os

import jwt
from apiflask import APIBlueprint, abort
from app.auth import auth
from app.db import database as db
from app.helper_functions import check_password, hash_password, abort_if_no_admin, make_response, get_email_or_abort_401, get_user
from app.models import User
from app.schema import UsersSchema, TokenSchema, LoginDataSchema, AdminDataSchema, DeleteUserSchema, RegisterDataSchema, UpdateUserDataSchema, CronDataSchema
from flask import current_app

users_blueprint = APIBlueprint('users', __name__, url_prefix='/api')
__location__ = os.path.realpath(os.path.join(os.getcwd(), os.path.dirname(__file__)))


@users_blueprint.route('/users', methods=['GET'])
@users_blueprint.output(UsersSchema(many=True), 200)
@users_blueprint.auth_required(auth)
@users_blueprint.doc(summary="Get all users", description="Returns all existing users as array")
def users():
    abort_if_no_admin()

    res = []

    # Query all users and convert them to dicts
    for i in User.query.all():
        res.append(i.as_dict())

    return make_response(res, 200, "Successfully received all users")


@users_blueprint.route('/user', methods=['GET'])
@users_blueprint.output(UsersSchema(), 200)
@users_blueprint.auth_required(auth)
@users_blueprint.doc(summary="Get current user", description="Returns current user")
def user():
    email = get_email_or_abort_401()

    # Query current user
    query_user = get_user(email)

    return make_response(query_user.as_dict(), 200, "Successfully received current user data")


@users_blueprint.route('/user/login', methods=['POST'])
@users_blueprint.output(TokenSchema(), 200)
@users_blueprint.input(schema=LoginDataSchema)
@users_blueprint.doc(summary="Login", description="Returns jwt token if username and password match, otherwise returns error")
def login(data):
    # Check if required data is available
    if not check_if_password_data_exists(data):
        abort(400, "Password missing")

    if not check_if_email_data_exists(data):
        abort(400, "Email missing")

    # Query current user
    query_user = get_user(data['email'])

    # Check if password matches
    if not check_password(query_user.password, data['password'].encode("utf-8")):  # Password incorrect
        abort(500, message="Unable to login")

    # Check if user is bot
    if query_user.email == current_app.config['BOT_EMAIL']:
        # Set bot token valid for 1 year
        token = jwt.encode({'email': query_user.email, 'exp': datetime.datetime.utcnow() + datetime.timedelta(days=365)}, current_app.config['SECRET_KEY'], "HS256")
    else:
        # Set token valid for 1 day
        token = jwt.encode({'email': query_user.email, 'exp': datetime.datetime.utcnow() + datetime.timedelta(days=1)}, current_app.config['SECRET_KEY'], "HS256")

    return make_response({"token": token}, 200, "Successfully logged in")


@users_blueprint.route('/user/register', methods=['POST'])
@users_blueprint.output(UsersSchema(), 200)
@users_blueprint.input(schema=RegisterDataSchema)
@users_blueprint.doc(summary="Register", description="Registers user")
def register(data):
    # Check if required data is available
    if not check_if_email_data_exists(data):
        abort(400, "Email missing")

    if not check_if_username_data_exists(data):
        abort(400, "Username missing")

    if not check_if_password_data_exists(data):
        abort(400, "Password missing")

    # Check if user already exists
    query_user = db.session.query(User).filter_by(email=data['email']).first()
    if query_user is not None:
        abort(500, message="Email already exist")

    # Add user to database
    new_user = User(
        email=data['email'],
        username=data['username'],
        password=hash_password(data['password']),
        admin=False,
        cron="0 8 * * *"
    )
    db.session.add(new_user)
    db.session.commit()

    return make_response(new_user.as_dict(), 200, "Successfully registered user")


@users_blueprint.route('/user', methods=['PUT'])
@users_blueprint.output({}, 200)
@users_blueprint.input(schema=UpdateUserDataSchema)
@users_blueprint.auth_required(auth)
@users_blueprint.doc(summary="Update user", description="Changes password and/or username of current user")
def update_user(data):
    email = get_email_or_abort_401()

    # Query current user
    query_user = get_user(email)

    # Check if password data is available -> if, change password
    if check_if_password_data_exists(data):
        query_user.password = hash_password(data['password'])

    # Check if username data is available -> if, change username
    if check_if_username_data_exists(data):
        query_user.username = data['username']

    db.session.commit()

    return make_response({}, 200, "Successfully updated user")


@users_blueprint.route('/user/setAdmin', methods=['PUT'])
@users_blueprint.output({}, 200)
@users_blueprint.input(schema=AdminDataSchema)
@users_blueprint.auth_required(auth)
@users_blueprint.doc(summary="Set user admin state", description="Set admin state of specified user")
def set_admin(data):
    abort_if_no_admin()  # Only admin users can do this

    # Check if required data is available
    if not check_if_email_data_exists(data):
        abort(400, "Email missing")

    if not check_if_admin_data_exists(data):
        abort(400, "Admin data missing")

    # Get user by email
    query_user = get_user(data['email'])

    # Update user admin state
    query_user.admin = data['admin']
    db.session.commit()

    return make_response({}, 200, "Successfully updated users admin rights")


@users_blueprint.route('/user/setCron', methods=['PUT'])
@users_blueprint.output({}, 200)
@users_blueprint.input(schema=CronDataSchema)
@users_blueprint.auth_required(auth)
@users_blueprint.doc(summary="Set update cron", description="Set update cron of specified user")
def set_cron(data):
    email = get_email_or_abort_401()

    # Check if required data is available
    if not check_if_cron_data_exists(data):
        abort(400, "Cron data missing")

    # Update user cron
    get_user(email).cron = data['cron']
    db.session.commit()

    return make_response({}, 200, "Successfully updated users cron")


@users_blueprint.route('/user', methods=['DELETE'])
@users_blueprint.output({}, 200)
@users_blueprint.input(schema=DeleteUserSchema)
@users_blueprint.auth_required(auth)
@users_blueprint.doc(summary="Delete user", description="Deletes user by username")
def delete_user(data):
    # Check if required data is available
    if not check_if_email_data_exists(data):
        abort(400, "Email missing")

    # Check if email to delete is current user
    # -> if, delete user
    # -> if not, check if user is admin
    # -> if, delete user
    # -> else, abort
    if data['email'] == get_email_or_abort_401():  # Username is same as current user
        db.session.query(User).filter_by(email=data['email']).delete()
        db.session.commit()
    else:
        abort_if_no_admin()

        db.session.query(User).filter_by(email=data['email']).delete()
        db.session.commit()

    return make_response({}, 200, "Successfully removed user")


def check_if_email_data_exists(data):
    if "email" not in data:
        return False

    if data['email'] == "" or data['email'] is None:
        return False

    return True


def check_if_password_data_exists(data):
    if "password" not in data:
        return False

    if data['password'] == "" or data['password'] is None:
        return False

    return True


def check_if_username_data_exists(data):
    if "username" not in data:
        return False

    if data['username'] == "" or data['username'] is None:
        return False

    return True


def check_if_admin_data_exists(data):
    if "admin" not in data:
        return False

    if data['admin'] == "" or data['admin'] is None:
        return False

    return True


def check_if_cron_data_exists(data):
    if "cron" not in data:
        return False

    if data['cron'] == "" or data['cron'] is None:
        return False

    return True