import json
import subprocess
import sys
from pathlib import Path

import kivy
kivy.require('1.11.1')

from kivy.app import App
from kivy.core.window import Window
from kivy.properties import StringProperty, ObjectProperty, ListProperty, BooleanProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.widget import Widget


class Song(BoxLayout):
    active = BooleanProperty(False)
    path = ObjectProperty('')
    
    def on_path(self, instance, value):
        self.search_media()

    def search_media(self):
        self.name = self.path.name
        self.original = None
        self.author = None
        self.video = None
        self.video_type = None
        self.vtt = None
        self.srt = None
        self.ass = None
        self.cover = None
        self.thumbnail = None
        self.files = []
        for entry in self.path.iterdir():
            if entry.name == 'metadata.json':
                with entry.open('r') as metadatafile:
                    self.metadata = json.load(metadatafile)
                if 'name' in self.metadata:
                    self.name = self.metadata['name']
                if 'original' in self.metadata:
                    self.original = self.metadata['original']
                if 'author' in self.metadata:
                    self.author = self.metadata['author']
            elif entry.name.endswith('mp4'):
                self.video = str(entry)
                self.video_type = 'video/mp4'
            elif entry.name.endswith('webm'):
                self.video = str(entry)
                self.video_type = 'video/webm'
            elif entry.name.endswith('ogv'):
                self.video = str(entry)
                self.video_type = 'video/ogg'
            elif entry.name.endswith('vtt'):
                self.vtt = str(entry)
            elif entry.name == "{}.srt".format(self.path.name):
                self.srt = str(entry)
            elif entry.name.endswith('ass'):
                self.ass = str(entry)
            elif entry.name == 'thumb.jpg':
                self.thumbnail = str(entry)
            elif entry.name.endswith('jpg'):
                self.cover = str(entry)
            elif entry.name == 'index.html':
                continue

    @property
    def publish(self):
        return self.video and self.subtitle

    @property
    def subtitle(self):
        return self.ass or self.srt or self.vtt


class KaraokeGUI(BoxLayout):
    active_song = ObjectProperty(None)
    songs = ListProperty([])

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.keyboard = Window.request_keyboard(
            self.keyboard_closed,
            self,
            'text',
        )
        self.keyboard.bind(on_key_down=self.on_key_down)

    def on_key_down(self, keyboard, keycode, text, modifiers):
        if text == 'a':
            self.previous()
            return True
        elif text == 'd':
            self.next()
            return True
        elif text == 's':
            self.play()
            return True
        return False

    def keyboard_closed(self):
        pass

    def on_songs(self, instance, value):
        container = self.ids['song_container']
        container.clear_widgets()
        for song in self.songs:
            container.add_widget(song)
        self.active_song = self.songs[0]

    def on_active_song(self, instance, value):
        for song in self.songs:
            song.active = False
        value.active = True
        current_song_image = self.ids['current_song_image']
        current_song_image.source = value.cover

        scrollview = self.ids['songs_scroll']
        scrollview.scroll_to(value)

    def previous(self):
        idx = self.songs.index(self.active_song)

        if idx > 0:
            idx -= 1
        else:
            idx = len(self.songs) - 1

        self.active_song = self.songs[idx]

    def next(self):
        idx = self.songs.index(self.active_song)

        if idx < len(self.songs) - 1:
            idx += 1
        else:
            idx = 0

        self.active_song = self.songs[idx]

    def play(self):
        subprocess.call([
            'vlc',
            '--fullscreen',
            '--sub-file',
            self.active_song.subtitle,
            self.active_song.video,
            'vlc://quit'
        ])


class KaraokeApp(App):
    kv_directory = 'kv_templates'

    def __init__(self, root_folder, **kwargs):
        super().__init__(**kwargs)
        self.root_folder = root_folder

    def build(self):
        super().build()

        songs = []
        container = self.root.ids['song_container']
        for entry in self.root_folder.iterdir():
            if entry.is_dir():
                song = Song(
                    path=entry,
                )
                if song.publish:
                    songs.append(song)
        self.root.songs = songs
        return self.root


if __name__ == '__main__':
    Window.fullscreen = True
    KaraokeApp(Path(sys.argv[1])).run()