#!/usr/bin/env python3

import uuid
import sqlite3
import base64
from datetime import datetime
import pytz
import os
from flask import Flask, request, render_template
from flask_uuid import FlaskUUID
from flask_qrcode import QRcode
from flask_socketio import SocketIO, emit
from werkzeug.middleware.proxy_fix import ProxyFix
import hashlib
import requests


app = Flask(__name__)
FlaskUUID(app)
qrcode = QRcode(app)
app.config['SECRET_KEY'] = '53a8373e7ae652cd38beba15454b1dc4'
app.wsgi_app = ProxyFix(app.wsgi_app)
socketio = SocketIO(app, async_mode=None)


def get_db_connection():
    conn = sqlite3.connect('database.db')
    conn.row_factory = sqlite3.Row
    return conn


def hash_string(string):
    salt = 'xpwQDFQ7gvcQ--rgO7l9yA'
    return hashlib.md5(salt.encode() + string.encode()).hexdigest()


def check_hash(string, hashed_string):
    salt = 'xpwQDFQ7gvcQ--rgO7l9yA'
    return hashed_string == hashlib.md5(salt.encode() + string.encode()).hexdigest()


def type_string(string):
    return hashlib.md5(string.encode()).hexdigest()


def check_type(string):
    if string == '02181ec55d150f6230547dbbf313e4f8':
        type_check = 'CheckIn'
    elif string == '231d5cc583e69d5b6c5bdced40dcc27c':
        type_check = 'CheckOut'
    else:
        type_check = 'mistake'
    return type_check


def generate_next_url(type, ip_branch):
    next_uuid = str(uuid.uuid1())
    url = str(next_uuid) + '/' + hash_string(next_uuid) + \
        '/' + type_string(type) + '/' + (ip_branch)
    message_bytes = url.encode('ascii')
    base64_bytes = base64.b64encode(message_bytes)
    url = base64_bytes.decode('ascii')
    return url


@app.route('/')
def show_qr_and_list():
    # TODO: reject direct connections to server; allow access only via proxy
    get_list = requests.get(
        'http://137.184.126.24:8080/hr_attendance_extended/public/attendance/').json()
    list_ips = get_list["list_ips"]
    ip_branch = request.environ.get('HTTP_X_REAL_IP', request.remote_addr)
    if ip_branch in list_ips:
        access = True
    else:
        access = False
    return render_template("template.html", ip_branch=ip_branch, access=access)


@app.route('/<uuid:id>/<hashed>/<type>/<ip_branch>')
def catch_uuids(id, hashed, type, ip_branch):
    user = request.headers.get('Remote-User')
    # TODO: Check directly with Authelia using https://auth.agofer.net/api/verify
    time = datetime.now(pytz.timezone('America/Bogota')
                        ).strftime("%Y-%m-%d %H:%M:%S")
    type_check = check_type(str(type))
    error = None
    data = []
    conn = get_db_connection()
    existing1 = conn.execute(
        'SELECT * FROM hits WHERE uuid1 = ?', (str(id),)).fetchone()
    existing2 = conn.execute(
        'SELECT * FROM hits WHERE uuid2 = ?', (str(id),)).fetchone()
    if not user:
        error = 'NO_USERNAME'
    elif existing1:
        error = 'ALREADY_USED'
    elif existing2:
        error = 'ALREADY_USED'
    elif not check_hash(str(id), str(hashed)):
        error = 'DIFFERENT_NODE'
    else:
        if type_check == 'mistake':
            error = 'DIFFERENT_TYPE'
        else:
            exit = conn.execute(
                'SELECT * FROM hits WHERE user = ? AND dateout = ?', (user, '')).fetchone()
            if type_check == 'CheckIn':
                if exit:
                    error = 'MISSING_EXIT'
                else:
                    conn.execute(
                        "INSERT INTO hits (user, uuid1, datein) VALUES (?, ?, ?)", (user, str(id), time))
                    conn.commit()
                    url = generate_next_url(type_check, str(ip_branch))
                    qr = qrcode(url)
                    socketio.emit('qr_used', {'data': (
                        qr, url, user, time, type_check,)})
            elif type_check == 'CheckOut':
                if exit:
                    conn.execute(
                        "UPDATE hits SET  dateout = ?, uuid2 = ?, ip_branch = ? WHERE user = ? AND dateout = ?", (time, str(id), str(ip_branch), user, ''))
                    conn.commit()
                    url = generate_next_url(type_check, str(ip_branch))
                    qr = qrcode(url)
                    os.system('python get_query.py')
                    socketio.emit('qr_used', {'data': (
                        qr, url, user, time, type_check)})
                else:
                    error = 'MISSING_ENTER'
            data = conn.execute(
                'SELECT * FROM hits WHERE user = ? ORDER BY id DESC LIMIT 10', (user,)).fetchall()
        conn.close()
    return render_template('thanks.html', user=user, time=time, error=error, type=type_check, hits=data)


@socketio.on('message')
def handle_message(data):
    print('received message: ' + data)


@socketio.on('connection')
def handle_initial_connection(json_data):
    ip_branch = request.environ.get('HTTP_X_REAL_IP', request.remote_addr)
    url = generate_next_url('CheckIn', ip_branch)
    url2 = generate_next_url('CheckOut', ip_branch)
    qr = qrcode(url)
    qr2 = qrcode(url2)
    conn = get_db_connection()
    last_entries = conn.execute(
        'SELECT user, datein FROM hits WHERE datein != ? ORDER BY id DESC LIMIT 10', ('',)).fetchall()
    last_entries2 = conn.execute(
        'SELECT user, dateout FROM hits WHERE dateout != ? ORDER BY id DESC LIMIT 10', ('',)).fetchall()
    array_entries = []
    array_entries2 = []
    for entry in last_entries:
        array_entries.append((entry[0], entry[1]))
    for entry2 in last_entries2:
        array_entries2.append((entry2[0], entry2[1]))
    conn.close()
    emit('initial_qr', {
         'data': (qr, url, array_entries, qr2, url2, array_entries2)})
    print('received json: ' + str(json_data))


if __name__ == '__main__':
    socketio.run(app, host='0.0.0.0')