# Created 2019-09-10 by NGnius
from flask import Flask, Blueprint, jsonify, request, send_file, render_template
import sqlite3 as dblib
from hashlib import sha512
from os import getcwd
from threading import get_ident
from time import time
from datetime import datetime

database_path = 'rxsm-update.db'

database_connections = dict()
app = Flask('rxsm-update-server')

def get_or_create_connection():
    global database_connections, database_path
    thread_id = get_ident()
    if thread_id not in database_connections:
        database_connections[thread_id] = dblib.connect(database_path)
    return database_connections[thread_id]

def close_connection():
    thread_id = get_ident()
    if thread_id in database_connections:
        database_connections[thread_id].close()
        del(database_connections[thread_id])

@app.route('/', methods=['GET'])
def index():
    return render_template('index.html')

@app.route('/release', methods=['POST'])
def create_or_modify_release():
    try:
        req_json = request.get_json(force=True)
        token = req_json['token']
        version = req_json['version']
        platform = req_json['platform']
        url = req_json['url']
    except:
        return jsonify({'status':400, 'reason':'Invalid request; missing parameter or invalid JSON'}), 400

    with open('.token', 'r') as f:
        master_token = f.read()
    if sha512(token.encode()).hexdigest() != master_token:
        return jsonify({'status':403, 'reason':'Permission denied; invalid token'}), 403

    db_connection = get_or_create_connection()
    cursor = db_connection.cursor()
    cursor.execute('SELECT version FROM releases WHERE version=? AND platform=?', (version, platform))
    result = cursor.fetchone()
    operation = ''
    if result is None:
        cursor.execute('INSERT INTO releases (version, platform, url, created_date) VALUES (?,?,?,?)', (version, platform, url, int(time())))
        operation = 'create'
    else:
        cursor.execute('UPDATE releases SET url=?, created_date=? WHERE version=? and platform=?', (url, int(time()), version, platform))
        operation = 'update'
    db_connection.commit()
    close_connection()

    return jsonify({'status':200, 'reason':'Version %s %sd successfully' % (version, operation)}), 200

@app.route('/db', methods=['GET'])
@app.route('/database', methods=['GET'])
def download_database():
    return send_file(database_path, cache_timeout=1, as_attachment=True, attachment_filename='rxsm.sqlite')

@app.route('/update', methods=['POST'])
@app.route('/check-for-update', methods=['POST'])
def check_for_update():
    start = time()
    db_connection = get_or_create_connection()
    cursor = db_connection.cursor()
    collect_anonymous_stats = str(request.headers.get('DNT')).strip() != '1'
    # hit counter
    if collect_anonymous_stats:
        today = datetime.today().date().isoformat()
        cursor.execute('SELECT count FROM hits WHERE date=?', (today,))
        result = cursor.fetchone()
        if result is not None:
            cursor.execute('UPDATE hits SET count=count+1 WHERE date=?', (today,))
        else:
            cursor.execute('INSERT INTO hits (date, count) VALUES (?,?)', (today, 1))
        db_connection.commit()
    # update lookup
    try:
        req_json = request.get_json(force=True)
        current_version = req_json['version']
        platform = req_json['platform']
    except:
        close_connection()
        return jsonify({'status':400, 'reason':'Invalid request; missing parameter or invalid JSON'}), 400
    cursor.execute('SELECT version, url FROM releases WHERE platform=? ORDER BY created_date DESC', (platform,))
    result = cursor.fetchone()
    close_connection()
    if result is None:
        return jsonify({'status':404, 'reason':'Platform not found (%ss)' % (time()-start), 'url':'', 'out-of-date':False}), 404
    elif result[0] != current_version:
        return jsonify({'status':200, 'reason':'Ok (%ss)' % (time()-start), 'url':result[1], 'out-of-date':True}), 200
    else:
        return jsonify({'status':200, 'reason':'Ok (%ss)' % (time()-start), 'url':result[1], 'out-of-date':False}), 200

# always try to create db table(s)
conn = get_or_create_connection()
cursor = conn.cursor()
cursor.execute(\
    '''CREATE TABLE IF NOT EXISTS releases (
    id INTEGER PRIMARY KEY,
    version TEXT NOT NULL,
    url TEXT NOT NULL,
    platform TEXT NOT NULL,
    created_date INTEGER NOT NULL
    )''' )
cursor.execute(\
    '''CREATE TABLE IF NOT EXISTS hits (
    date TEXT UNIQUE NOT NULL,
    count INTEGER NOT NULL
    )''' )
conn.commit()

if __name__ == '__main__':
    print('Working directory: ' + getcwd())
    app.run(host='0.0.0.0', port=9080, threaded=True)