import datetime
import os

import jwt
from apiflask import APIBlueprint, abort
from flask import jsonify

from db import db
from helper_functions import check_password, hash_password, get_username_or_abort_401, abort_if_no_admin
from models import User
from scheme import UsersSchema, TokenSchema, LoginDataSchema, AdminDataSchema, DeleteUserSchema
from auth import auth

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 = []
    for i in User.query.all():
        res.append(i.as_dict())

    return jsonify({"status": 200, "data": res})


@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():
    username = get_username_or_abort_401()

    res = db.session.query(User).filter_by(username=username).first().as_dict()

    return jsonify({"status": 200, "data": res})


@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_user_data_exists(data)

    username = data['username']
    password = data['password']

    query_user = db.session.query(User).filter_by(username=username).first()

    if query_user is None:  # Username doesn't exist
        abort(500, message="Unable to login")

    if not check_password(query_user.password, password):  # Password incorrect
        abort(500, message="Unable to login")

    token = jwt.encode({'username': query_user.username, 'exp': datetime.datetime.utcnow() + datetime.timedelta(minutes=45)}, os.getenv('SECRET_KEY'), "HS256")
    return jsonify({"status": 200, "text": "Successfully logged in", "data": {"token": token}})


@users_blueprint.route('/user/register', methods=['POST'])
@users_blueprint.output(UsersSchema(), 200)
@users_blueprint.input(schema=LoginDataSchema)
@users_blueprint.doc(summary="Register", description="Registers user")
def register(data):
    check_if_user_data_exists(data)

    username = data['username']
    password = data['password']

    query_user = db.session.query(User).filter_by(username=username).first()

    if query_user is not None:  # Username already exist
        abort(500, message="Username already exist")

    new_user = User(
        username=username,
        password=hash_password(password),
        admin=False
    )
    db.session.add(new_user)
    db.session.commit()

    return jsonify({"status": 200, "text": "Successfully registered user", "data": new_user.as_dict()})


@users_blueprint.route('/user', methods=['PUT'])
@users_blueprint.output({}, 200)
@users_blueprint.input(schema=LoginDataSchema)
@users_blueprint.auth_required(auth)
@users_blueprint.doc(summary="Update user", description="Changes password and/or username of current user")
def update_user(data):
    username = get_username_or_abort_401()

    check_if_user_data_exists(data)

    new_username = data['username']
    new_password = data['password']

    query_user = db.session.query(User).filter_by(username=username).first()

    if query_user is None:  # Username doesn't exist
        abort(500, message="Unable to login")

    if new_password is not None:
        query_user.password = hash_password(new_password)
    if new_username is not None:
        query_user.username = new_username

    db.session.commit()

    return jsonify({"status": 200, "text": "Successfully updated user", "data": {}})


@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_admin_data_exists(data)

    username = data['username']
    admin = data['admin']

    query_user = db.session.query(User).filter_by(username=username).first()

    if query_user is None:  # Username doesn't exist
        abort(500, message="Unable to login")

    query_user.admin = admin
    db.session.commit()

    return jsonify({"status": 200, "text": "Successfully updated users admin rights", "data": {}})


@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_delete_data_exists(data)

    username = data['username']

    if username == get_username_or_abort_401():  # Username is same as current user
        db.session.query(User).filter_by(username=username).delete()
        db.session.commit()
    else:  # Delete different user than my user -> only admin users
        abort_if_no_admin()

        db.session.query(User).filter_by(username=username).delete()
        db.session.commit()

    return jsonify({"status": 200, "text": "Successfully removed user", "data": {}})


def check_if_user_data_exists(data):
    if "username" not in data:
        abort(400, message="Username missing")

    if data['username'] == "" or data['username'] is None:
        abort(400, message="Username missing")

    if "password" not in data:
        abort(400, message="Password missing")

    if data['password'] == "" or data['password'] is None:
        abort(400, message="Password missing")


def check_if_admin_data_exists(data):
    if "username" not in data:
        abort(400, message="Username missing")

    if data['username'] == "" or data['username'] is None:
        abort(400, message="Username missing")

    if "admin" not in data:
        abort(400, message="Admin state missing")

    if data['admin'] == "" or data['admin'] is None:
        abort(400, message="Admin state missing")


def check_if_delete_data_exists(data):
    if "username" not in data:
        abort(400, message="Username missing")

    if data['username'] == "" or data['username'] is None:
        abort(400, message="Username missing")