from kivy.app import App
from kivy.lang import Builder
from kivy.core.audio import SoundLoader
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty, StringProperty
from kivy.clock import Clock
from pathlib import Path

kv = """
RootBoxLayout:
    orientation: 'vertical'
    AnchorLayout:
        ToggleButton:
            size_hint: None, None
            size: 200, 48
            text: {'normal': 'Play', 'down': 'Stop'}[self.state]
            on_state: root.control(self.state)
    BoxLayout:
        size_hint_y: None
        height: 48
        padding:25
        ProgressBar:
            id:progress
            max:100

        Label:
            id: title
        Label:
            id: length
        Label:
            text: root.current
"""

class RootBoxLayout(BoxLayout):
    song = ObjectProperty()
    current = StringProperty()

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.schedule = None
        self.song = SoundLoader.load('piano/4.mp3')

    def control(self, state):
        if state == 'down':
            self.song.play()
            self.ids.title.text = Path(self.song.source).name
            self.ids.length.text = f'length: {self.song.length:0.1f} seconds'
            self.schedule = Clock.schedule_interval(self._update_pos, .1)
            self.ids.progress.value+=10
        else:
            self.song.stop()
            self.schedule.cancel()

    def _update_pos(self, _):
        self.current = f'{self.song.get_pos():0.1f} seconds'


class SoundTestApp(App):
    def build(self):
        return Builder.load_string(kv)


SoundTestApp().run()