import threading
import time

class Action:
    action_types = [
        'command',
        'pause',
        'play',
        'seek',
        'stop',
        'stop_all_actions',
        'unpause',
        'volume',
        'wait',
    ]

    def __init__(self, action, key, **kwargs):
        if action in self.action_types:
            self.action = action
        else:
            raise Exception("Unknown action {}".format(action))

        self.key = key
        self.mapping = key.parent
        self.arguments = kwargs
        self.sleep_event = None

    def ready(self):
        if 'music' in self.arguments:
            return self.arguments['music'].check_is_loaded()
        else:
            return True

    def run(self):
        print(self.description())
        getattr(self, self.action)(**self.arguments)

    def description(self):
        return getattr(self, self.action + "_print")(**self.arguments)

    def interrupt(self):
        if getattr(self, self.action + "_interrupt", None):
            return getattr(self, self.action + "_interrupt")(**self.arguments)

    # Actions
    def command(self, command = "", **kwargs):
        # FIXME: todo
        pass

    def music_list(self, music):
        if music is not None:
            return [music]
        else:
            return self.mapping.open_files.values()

    def pause(self, music = None, **kwargs):
        for music in self.music_list(music):
            if music.is_loaded_playing():
                music.pause()

    def unpause(self, music = None, **kwargs):
        for music in self.music_list(music):
            if music.is_loaded_paused():
                music.unpause()

    def play(self, music = None, fade_in = 0, start_at = 0,
            restart_if_running = False, volume = 100, **kwargs):
        if music is not None:
            if restart_if_running:
                if music.is_not_stopped():
                    music.stop()
                music.play(volume = volume, fade_in = fade_in, start_at = start_at)
            else:
                if not music.is_not_stopped():
                    music.play(volume = volume, fade_in = fade_in, start_at = start_at)

    def seek(self, music = None, value = 0, delta = False, **kwargs):
        for music in self.music_list(music):
            music.seek(value = value, delta = delta)

    def stop(self, music = None, fade_out = 0, wait = False, **kwargs):
        previous = None
        for music in self.music_list(music):
            if music.is_loaded_paused() or music.is_loaded_playing():
                if previous is not None:
                    previous.stop(fade_out = fade_out)
                previous = music

        if previous is not None:
            previous.stop(fade_out = fade_out, wait = wait)

    def stop_all_actions(self, **kwargs):
        self.mapping.stop_all_running()

    def volume(self, music = None, value = 100, delta = False, **kwargs):
        if music is not None:
            music.set_volume(value, delta = delta)
        else:
            self.mapping.set_master_volume(value, delta = delta)

    def wait(self, duration = 0, music = None, **kwargs):
        self.sleep_event = threading.Event()

        if music is not None:
            music.wait_end()

        threading.Timer(duration, self.sleep_event.set).start()
        self.sleep_event.wait()

    # Action messages
    def command_print(self, command = "", **kwargs):
        return "running command {}".format(command)

    def pause_print(self, music = None, **kwargs):
        if music is not None:
            return "pausing « {} »".format(music.name)
        else:
            return "pausing all musics"

    def unpause_print(self, music = None, **kwargs):
        if music is not None:
            return "unpausing « {} »".format(music.name)
        else:
            return "unpausing all musics"

    def play_print(self, music = None, fade_in = 0, start_at = 0,
            restart_if_running = False, volume = 100, **kwargs):
        message = "starting "
        if music is not None:
            message += "« {} »".format(music.name)
        else:
            message += "music"

        if start_at != 0:
            message += " at {}s".format(start_at)

        if fade_in != 0:
            message += " with {}s fade_in".format(fade_in)

        message += " at volume {}%".format(volume)

        if restart_if_running:
            message += " (restarting if already running)"

        return message

    def stop_print(self, music = None, fade_out = 0, wait = False, **kwargs):
        message = "stopping "
        if music is not None:
            message += "music « {} »".format(music.name)
        else:
            message += "all musics"

        if fade_out > 0:
            message += " with {}s fadeout".format(fade_out)
            if wait:
                message += " (waiting the end of fadeout)"

        return message

    def stop_all_actions_print(self, **kwargs):
        return "stopping all actions"

    def seek_print(self, music = None, value = 0, delta = False, **kwargs):
        if delta:
            if music is not None:
                return "moving music « {} » by {:+d}s".format(music.name, value)
            else:
                return "moving all musics by {:+d}s".format(value)
        else:
            if music is not None:
                return "moving music « {} » to position {}s".format(music.name, value)
            else:
                return "moving all musics to position {}s".format(value)

    def volume_print(self, music = None, value = 100, delta = False, **kwargs):
        if delta:
            if music is not None:
                return "{:+d}% to volume of « {} »".format(value, music.name)
            else:
                return "{:+d}% to volume".format(value)
        else:
            if music is not None:
                return "setting volume of « {} » to {}%".format(music.name, value)
            else:
                return "setting volume to {}%".format(value)

    def wait_print(self, duration = 0, music = None, **kwargs):
        if music is None:
            return "waiting {}s".format(duration)
        elif duration == 0:
            return "waiting the end of « {} »".format(music.name)
        else:
            return "waiting the end of « {} » + {}s".format(music.name, duration)


    # Interruptions
    def wait_interrupt(self, duration = 0, music = None, **kwargs):
        if self.sleep_event is not None:
            self.sleep_event.set()
        if music is not None:
            music.wait_event.set()