from glob import glob
from threading import Thread
import json
import logging
import mimetypes
import os
import time

from tornado.httpserver import HTTPServer
from tornado import gen
from tornado.ioloop import IOLoop
from tornado.web import Application, RequestHandler, HTTPError
from tornado.websocket import WebSocketHandler
import requests
import tornado.web
import ox.srt


logger = logging.getLogger('cdosea.subtitles')
sockets = []
STATIC_ROOT = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'static')
ADDRESS = '0.0.0.0'
PORT = 8080
DEBUG = False


class Subtitles():
    path = None
    next_path = None
    playlist = None
    player = None
    last = 0

    def __init__(self, player, playlist):
        self.player = player
        with open(playlist, 'r') as fd:
            self.playlist = fd.read().strip().split('\n')
        self.player.observe_property('time-pos', self.update)

    def update(self, pos):
        if pos is None:
            return
        if self.player and self.playlist and self.player.path:
            self.position = pos
            path = self.player.path.decode()
            trigger_path = path != self.path
            self.path = path
            self.update_next()
            self.load_subtitles()

            data = {
                'current': os.path.basename(self.path),
                'next': os.path.basename(self.next_path),
                'currentTime': pos
            }

            if trigger_path:
                data['subtitles'] = {}
                data['subtitles'][os.path.basename(self.next_path)] = self.next
                self.last = 0

            if abs(pos - self.last) > 0.5 or trigger_path:
                self.trigger(data)
                self.last = pos

    def update_next(self):
        index = self.playlist.index(self.path) + 1
        if index == len(self.playlist):
            index = 0
        self.next_path = self.playlist[index]

    def load_subtitles(self):
        srt = self.path.replace('.mp4', '.srt')
        self.current = ox.srt.load(srt)
        srt = self.next_path.replace('.mp4', '.srt')
        self.next = ox.srt.load(srt)

    def trigger(self, data):
        logger.debug('trigger %s', data)
        for socket in sockets:
            socket.post(data)

    def status(self):
        data = {
            'curent': os.path.basename(self.path) if self.path else '',
            'next': os.path.basename(self.next_path) if self.next_path else '',
            'currentTime': self.position
        }
        data['subtitles'] = {}
        data['subtitles'][os.path.basename(self.path)] = self.current
        data['subtitles'][os.path.basename(self.next_path)] = self.next
        return data


class Socket(WebSocketHandler):

    def initialize(self, sub):
        self.sub = sub

    def check_origin(self, origin):
        # bypass same origin check
        return True

    def open(self):
        if self not in sockets:
            sockets.append(self)

            self.post(self.sub.status())

    # websocket calls
    def on_close(self):
        if self in sockets:
            sockets.remove(self)

    def on_message(self, message):
        pass
        #logger.debug('got message %s', message)

    def post(self, data):
        try:
            message = json.dumps(data)
        except:
            logger.debug('failed to serialize data %s', data)
            return
        main = IOLoop.instance()
        main.add_callback(lambda: self.write_message(message))


class StaticFileHandler(RequestHandler):

    def initialize(self, root):
        self.root = root

    def head(self):
        self.get(include_body=False)

    @tornado.web.asynchronous
    @gen.coroutine
    def get(self, include_body=True):

        path = self.root + self.request.path
        if self.request.path == '/':
            path += 'index.html'

        mimetype = mimetypes.guess_type(path)[0]
        if mimetype is None:
            mimetype = 'text/html'
        self.set_header('Content-Type', mimetype)
        size = os.stat(path).st_size
        self.set_header('Accept-Ranges', 'bytes')
        chunk_size = 4096
        if include_body:
            if 'Range' in self.request.headers:
                self.set_status(206)
                r = self.request.headers.get('Range').split('=')[-1].split('-')
                start = int(r[0])
                end = int(r[1]) if r[1] else (size - 1)
                length = end - start + 1
                self.set_header('Content-Length', str(length))
                self.set_header('Content-Range', 'bytes %s-%s/%s' % (start, end, size))
                with open(path, 'rb') as fd:
                    fd.seek(start)
                    p = 0
                    while p < length:
                        chunk = max(chunk_size, length-p)
                        self.write(fd.read(chunk))
                        yield gen.Task(self.flush, include_footers=False)
                        p += chunk
            else:
                self.set_header('Content-Length', str(size))
                with open(path, 'rb') as fd:
                    p = 0
                    length = size
                    while p < length:
                        chunk = max(chunk_size, length-p)
                        self.write(fd.read(chunk))
                        yield gen.Task(self.flush, include_footers=False)
                        self.flush()
                        p += chunk
            self.finish()
        else:
            self.set_header('Content-Length', str(size))


class NotFoundHandler(RequestHandler):
    def get(self):
        raise HTTPError(404)


class SubtitleServer(Thread):

    def __init__(self, player, playlist):
        Thread.__init__(self)
        self.daemon = True
        self.player = player
        self.playlist = playlist
        self.start()

    def run(self):
        main(self.player, self.playlist)

    def join(self):
        IOLoop.instance().stop()
        return Thread.join(self)


def main(player, playlist):
    sub = Subtitles(player, playlist)

    options = {
        'debug': DEBUG,
        'gzip': False
    }
    handlers = [
        (r'/favicon.ico', NotFoundHandler),
        (r'/ws/', Socket, dict(sub=sub)),
        (r'/.*', StaticFileHandler, dict(root=STATIC_ROOT))
    ]

    if DEBUG:
        log_format = '%(asctime)s:%(levelname)s:%(name)s:%(message)s'
        logging.basicConfig(level=logging.DEBUG, format=log_format)
    http_server = HTTPServer(Application(handlers, **options))
    main = IOLoop.instance()

    def shutdown():
        http_server.stop()

    #signal.signal(signal.SIGTERM, shutdown)
    http_server.listen(PORT, ADDRESS)
    try:
        main.start()
    except:
        pass
    shutdown()