from flask import Flask, request, jsonify, make_response
from flask_sqlalchemy import SQLAlchemy
import uuid
from werkzeug.security import generate_password_hash, check_password_hash
import jwt
import datetime
from functools import wraps

app = Flask(__name__)

app.config['SECRET_KEY'] = 'thisissecret'
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:root@localhost/flask_db'

db = SQLAlchemy(app)


class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    public_id = db.Column(db.String(50), unique=True)
    name = db.Column(db.String(50))
    password = db.Column(db.String(80))
    admin = db.Column(db.Boolean)


class Todo(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    text = db.Column(db.String(50))
    complete = db.Column(db.Boolean)
    user_id = db.Column(db.Integer)


def token_required(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        token = None

        if 'x-access-token' in request.headers:
            token = request.headers['x-access-token']

        if not token:
            return jsonify({"message": "Token is missing"}), 401

        try:
            data = jwt.decode(token, app.config['SECRET_KEY'])
            current_user = User.query.filter_by(public_id=data['public_id']).first()
        except:
            return jsonify({'message': 'Token is invalid'}), 401

        return f(current_user, *args, **kwargs)

    return decorated


@app.route('/login', methods=['GET'])
def login():
    auth = request.authorization

    if not auth or not auth.username or not auth.password:
        return make_response('Could not verify', 401, {'WWW-Authenticate': 'Basic realm="Login required!"'})

    user = User.query.filter_by(name=auth.username).first()

    if not user:
        return make_response('Could not verify', 401, {'WWW-Authenticate': 'Basic realm="Login required!"'})

    if check_password_hash(user.password, auth.password):
        token = jwt.encode(
            {'public_id': user.public_id, 'exp': datetime.datetime.utcnow() + datetime.timedelta(minutes=30)},
            app.config['SECRET_KEY'])
        return jsonify({'token': token.decode('UTF-8')})
    return make_response('Could not verify', 401, {'WWW-Authenticate': 'Basic realm="Login required!"'})


@app.route('/user', methods=['GET'])
@token_required
def get_all_user(current_user):
    if not current_user.admin:
        return jsonify({"message": "Cannot perform that action!"})

    users = User.query.all()
    output = []
    for user in users:
        user_data = {}
        user_data['public_id'] = user.public_id
        user_data['name'] = user.name
        user_data['password'] = user.password
        user_data['admin'] = user.admin
        output.append(user_data)

    return jsonify({'users': output})


@app.route('/user/<public_id>', methods=['GET'])
@token_required
def get_one_user(current_user, public_id):
    user = User.query.filter_by(public_id=public_id).first()

    if not user:
        return jsonify({"message": "No user found"})

    user_data = {}
    user_data['public_id'] = user.public_id
    user_data['name'] = user.name
    user_data['password'] = user.password
    user_data['admin'] = user.admin

    return jsonify({'users': user_data})


@app.route('/user', methods=['POST'])
@token_required
def create_user(current_user):
    data = request.get_json()
    hashed_password = generate_password_hash(data['password'], method='sha256')
    new_user = User(public_id=str(uuid.uuid4()), name=data['name'], password=hashed_password, admin=False)
    db.session.add(new_user)
    db.session.commit()
    return jsonify({'message': 'New user created'})


@app.route('/user/<public_id>', methods=['PUT'])
@token_required
def promote_user(current_user, public_id):
    user = User.query.filter_by(public_id=public_id).first()

    if not user:
        return jsonify({"message": "No user found"})

    user.admin = True
    db.session.commit()

    return jsonify({"message": "user has been promoted"})


@app.route('/user/<public_id>', methods=['DELETE'])
@token_required
def delete_user(current_user, public_id):
    user = User.query.filter_by(public_id=public_id).first()

    if not user:
        return jsonify({"message": "No user found"})
    db.session.delete(user)
    db.session.commit()

    return jsonify({"message": "The user " + user.name + " has been deleted"})


if __name__ == '__main__':
    app.run(debug=True)