#!/usr/bin/env python3
from flask import Flask, request, make_response, session, redirect, render_template, send_from_directory, jsonify
from time import gmtime, strftime
from uuid import uuid4

import requests
import json
import sqlite3
import base64
import configparser
import os

"""
    SQLite3 Database Schema

    CREATE TABLE channels (
        "id" INTEGER PRIMARY KEY,
        "name" TEXT NOT NULL,
        "key" TEXT NOT NULL,
        "live_at" TEXT,
        "password" TEXT,
        "user_uuid" TEXT
    , "last_stream" TEXT);

    CREATE TABLE signed_users (
        "id" INTEGER PRIMARY KEY,
        "uuid" TEXT NOT NULL,
        "name" TEXT NOT NULL
    );

    d2c45910-8eb8-11e8-b357-b10f0028b927
"""

# Load configuration
config = configparser.ConfigParser()

config['Streaming'] = {
    'Database': 'streaming.db',
    'StreamServer': 'https://tv.icynet.eu/live/',
    'ServerHost': 'icynet.eu',
    'PublishAddress': 'rtmp://{host}:1935/hls-live/{streamer}',
    'Secret': 'changeme',
}
config['Auth'] = {
    'Server': 'http://localhost:8282',
    'Redirect': 'http://localhost:5000/auth/_callback/',
}
config['OAuth2'] = {
    'ClientID': '1',
    'ClientSecret': 'changeme',
}

if os.path.exists('config.ini'):
    config.read('config.ini')

with open('config.ini', 'w') as configfile:
   config.write(configfile)

# App settings

app = Flask(__name__)
app.secret_key = config['Streaming']['Secret']
app.config['SESSION_TYPE'] = 'redis'

auth_image = "{server}/api/avatar/{uuid}"
oauth_auth = "{server}/oauth2/authorize?response_type=code&state={state}&redirect_uri={redirect}&client_id={client}&scope=image"
stream_server = config['Streaming']['StreamServer']
auth_server = config['Auth']['Server']
oauth_redirect = config['Auth']['Redirect']
oauth_id = int(config['OAuth2']['ClientID'])
oauth_secret = config['OAuth2']['ClientSecret']

# Database
conn = sqlite3.connect(config['Streaming']['Database'], check_same_thread=False)

# Streamer Cache
stream_cache = {}

# Check if user is a streamer
def valid_streamer(uuid):
    streamer = None

    if 'uuid' in session:
        if session['uuid'] in stream_cache:
            streamer = stream_cache[session['uuid']]
        else:
            # Find key in database
            data = conn.execute('SELECT * FROM channels WHERE user_uuid=?', (session['uuid'],))
            row = data.fetchone()

            # Deny stream publish
            if row:
                streamer = row[2]

    return streamer

@app.route("/")
def index():
    streamer = False
    if 'uuid' in session:
        if valid_streamer(session['uuid']):
            streamer = True

    return render_template("index.html", streamer = streamer)

@app.route("/dashboard")
def dashboard():
    if not 'uuid' in session:
        return redirect("/login", code = 302)

    streamkey = valid_streamer(session['uuid'])
    if not streamkey:
        return make_response("Unauthorized.", 402)

    return render_template("dashboard.html", stream = streamkey,
        server = config['Streaming']['PublishAddress'].format(streamer = "", host = config['Streaming']['ServerHost']))

@app.route("/dashboard/data")
def dashboard_data():
    if not 'uuid' in session:
        return jsonify({'error': 'Unauthorized'})

    streamkey = valid_streamer(session['uuid'])
    if not streamkey:
        return jsonify({'error': 'Unauthorized'})

    # Find key in database
    data = conn.execute('SELECT * FROM channels WHERE key=?', (streamkey,))
    row = data.fetchone()

    if not row:
        return jsonify({'error': 'Unauthorized'})

    livedate = row[3]

    data = {
        'name': row[1],
        'key': streamkey,
        'uuid': session['uuid'],
        'live': livedate != None,
        'live_at': livedate,
        'last_stream': row[6],
    }

    return jsonify(data)

# Called when starting publishing
@app.route("/publish", methods=["POST"])
def publish():
    print(json.dumps(request.form, ensure_ascii=False))

    streamkey = request.form["name"]

    # Find key in database
    data = conn.execute('SELECT * FROM channels WHERE key=?', (streamkey,))
    row = data.fetchone()

    # Deny stream publish
    if not row:
        return make_response("Request Denied", 400)

    streamer = row[1]

    print("Streamer %s has started streaming!" % streamer)

    # Redirect stream publish to stream name
    url = config['Streaming']['PublishAddress'].format(streamer = streamer, host = "127.0.0.1")

    response = make_response(url, 302)
    response.headers["Location"] = url

    # Update database with stream timestamp
    starttime = strftime("%Y-%m-%d %H:%M:%S", gmtime())

    conn.execute('UPDATE channels SET live_at=? WHERE id=?', (starttime, row[0]))
    conn.commit()

    return response

# Called when stopped publishing
@app.route("/publish_done", methods=["POST"])
def publish_done():
    streamkey = request.form["name"]

    # Update database with stream end time
    endtime = strftime("%Y-%m-%d %H:%M:%S", gmtime())

    conn.execute('UPDATE channels SET live_at=NULL, last_stream=? WHERE key=?', (endtime, streamkey,))
    conn.commit()

    return "OK"

@app.route("/login")
def login():
    if 'uuid' in session:
        return make_response("Already authenticated as %s!" % session['username'])

    state = str(uuid4())
    session['state'] = state

    return redirect(oauth_auth.format(state = state, client = oauth_id, redirect = oauth_redirect, server = auth_server), code = 302)

@app.route("/logout")
def logout():
    session.clear()
    return redirect("/", code = 302)

@app.route("/auth/_callback/")
def cb():
    if not 'state' in session:
        return make_response("Something went wrong!", 402)

    code = request.args.get('code')
    state = request.args.get('state')

    if session['state'] != state:
        return make_response("Something went wrong!", 402)

    if not code:
        return make_response("Authorization denied by user", 402)

    # Get access token
    r = requests.post(auth_server + "/oauth2/token", data = {
        'grant_type': 'authorization_code',
        'code': code,
        'redirect_uri': oauth_redirect,
        'client_id': oauth_id,
        'client_secret': oauth_secret
    }, headers = {
        'Authorization': 'Basic ' + str(base64.b64encode(bytes("%s:%s" % (oauth_id, oauth_secret), 'utf-8')))
    })

    res_token = None
    try:
        res_token = r.json()
    except ValueError:
        return make_response("Something went wrong while getting an access token!")

    if 'error' in res_token:
        return make_response("%s: %s" % (res_token['error'], res_token['error_description']), 500)

    token = res_token['access_token']

    # Get user info
    ru = requests.get(auth_server + "/oauth2/user", headers = {
        'Authorization': 'Bearer ' + token
    })

    res_uinfo = None
    try:
        res_uinfo = ru.json()
    except ValueError:
        return make_response("Something went wrong while getting user information!")

    udata = conn.execute('SELECT * FROM signed_users WHERE uuid=?', (res_uinfo['uuid'],))
    row = udata.fetchone()

    if not row:
        conn.execute('INSERT INTO signed_users (uuid, name) VALUES (?, ?)', (res_uinfo['uuid'], res_uinfo['username']))
        conn.commit()

    session['uuid'] = res_uinfo['uuid']
    session['username'] = res_uinfo['username']

    return redirect("/", code = 302)

@app.route("/watch/<name>")
def watch(name):
    return render_template("player.html", name = name, server = stream_server)

@app.route("/player/<name>")
def watch_old(name):
    return redirect("/watch/%s" % name, code = 302)

@app.route("/dist/<path:path>")
def dist(path):
    return send_from_directory("dist", path)

if __name__ == '__main__':
    app.secret_key = '00-wegrhr[gqw[er=1ew qwergfdq.///**+'
    app.debug = True
    app.run()