#!/usr/bin/env python3
from flask import Flask, request, make_response, session, redirect, render_template, send_from_directory, jsonify
from time import gmtime, strftime, time
from uuid import uuid4
from bs4 import BeautifulSoup

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
    );
"""

# 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 memcache
stream_cache = {}

# Stat memcache
stat_cache = False
stat_cache_updated = 0

# 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

def pull_stream_metrics(uuid):
    global stat_cache
    global stat_cache_updated
    updated = False
    if not stat_cache or stat_cache_updated < int(time()) - 5:
        metric_path = stream_server + "stat"
        r = requests.get(metric_path)
        stat_cache = BeautifulSoup(r.text, "xml")
        updated = True
        print("Updating per request..")

    allapps = stat_cache.find_all("application")
    relevant = None
    for app in allapps:
        if str(app.find("name").string) == "live":
            relevant = app

    if not relevant:
        return None
    streams = relevant.find_all("stream")

    if not streams:
        return None

    if updated:
        stat_cache_updated = int(time())

    relevant = None
    for stream in streams:
        name = stream.find("name").string
        if name == uuid:
            relevant = stream

    if not relevant:
        return None

    data = {
        'time' : relevant.time.string,
        'bytes' : relevant.bytes_in.string,
        'video': {
            'width': relevant.meta.video.width.string,
            'height': relevant.meta.video.height.string,
            'frame_rate': relevant.meta.video.frame_rate.string,
            'codec': relevant.meta.video.codec.string,
        },
        'audio': {
            'sample_rate': relevant.meta.audio.sample_rate.string,
            'channels': relevant.meta.audio.channels.string,
            'codec': relevant.meta.audio.codec.string, 
        }
    }

    return data

@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 = "rtmp://" + config['Streaming']['ServerHost'] + "/live/")

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

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

    data = pull_stream_metrics(streamkey)
    if not data:
        return jsonify({'error': 'No data was returned..'})

    return jsonify(data)

@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()