awsmug/alexa-sdk

<?php

namespace Alexa\Media;

use Alexa\Skill_Template;
use Alexa\Output\Directive;
use Alexa\Playlist;

class Player_Skill extends Skill_Template {
    use Playlist;

    protected $text_launch = 'This is a media player.';

    protected $text_start = 'Playing %s.';

    protected $text_item_not_found = 'Could not find item to play.';

    protected $text_playback_failed = 'Playback of media file failed.';

    protected $reverse_playlist = false;

    public function __construct( $application_id ) {
        parent::__construct( $application_id );
    }

    public function intent_request() {
        $this->output()->response()->end_session();

        if ( 'Play' === $this->input()->request()->intent()->get_name() ) {
            $this->play();
        }

        if ( 'PlayLatest' === $this->input()->request()->intent()->get_name() ) {
            $this->play_latest();
        }

        if ( 'AMAZON.PauseIntent' === $this->input()->request()->intent()->get_name() ) {
            $this->pause();
        }

        if ( 'AMAZON.ResumeIntent' === $this->input()->request()->intent()->get_name() ) {
            $this->resume();
        }

        if ( 'AMAZON.NextIntent' === $this->input()->request()->intent()->get_name() ) {
            $this->next();
        }

        if ( 'AMAZON.PreviousIntent' === $this->input()->request()->intent()->get_name() ) {
            $this->previous();
        }

        if ( 'AudioPlayer.PlaybackFailed' === $this->input()->request()->intent()->get_name() ) {
            $this->output()->response()->output_speech()->set_text( $this->text_playback_failed );
        }

        return $this->output()->get_json();
    }

    protected function play() {
        $number     = $this->input()->request()->intent()->get_slot_value( 'Number' );
        $media_file = $this->playlist_get( $number - 1 );

        if ( ! $media_file ) {
            $this->output()->response()->output_speech()->set_text( sprintf( $this->text_item_not_found, 1, $this->playlist_count_items() ) );
            $this->output()->response()->end_session( false );

            return;
        }

        $directive = $this->get_directive( $media_file );
        $this->output()->response()->add_directive( $directive );

        $this->output()->response()->card()->set_text( $media_file['title'] );
        if ( ! empty( $media_file['image'] ) ) {
            $this->output()->response()->card()->set_small_image( $media_file['image'] );
        }

        $this->output()->response()->output_speech()->set_text( sprintf( $this->text_start, $media_file['title'] ) );
    }

    protected function play_latest() {
        $media_file = $this->playlist_get( $this->playlist_count_items() - 1 );

        $directive = $this->get_directive( $media_file );
        $this->output()->response()->add_directive( $directive );

        $this->output()->response()->card()->set_text( $media_file['title'] );
        if ( ! empty( $media_file['image'] ) ) {
            $this->output()->response()->card()->set_small_image( $media_file['image'] );
        }

        $this->output()->response()->output_speech()->set_text( sprintf( $this->text_start, $media_file['title'] ) );
    }

    protected function pause() {
        $directive = new Directive();
        $directive->set_type( 'AudioPlayer.Stop' );
        $this->output()->response()->add_directive( $directive );
    }

    protected function resume() {
        $actual_token = $this->input()->context()->audio_player()->get_token();
        $offset       = $this->input()->context()->audio_player()->get_offset();
        $media_file   = $this->playlist_get_by_token( $actual_token );

        $directive = $this->get_directive( $media_file );
        $directive->audio_item()->stream()->set_offset( $offset );
        $this->output()->response()->add_directive( $directive );
        $this->output()->response()->output_speech()->set_text( sprintf( $this->text_start, $media_file['title'] ) );
    }

    protected function next() {
        $actual_token = $this->input()->context()->audio_player()->get_token();
        $media_file   = $this->playlist_get_next_by_token( $actual_token );
        $directive    = $this->get_directive( $media_file );

        if ( ! $media_file ) {
            $offset     = $this->input()->context()->audio_player()->get_offset();
            $media_file = $this->playlist_get_by_token( $actual_token );
            $directive  = $this->get_directive( $media_file );
            $directive->audio_item()->stream()->set_offset( $offset );
        }

        $this->output()->response()->add_directive( $directive );
        $this->output()->response()->output_speech()->set_text( sprintf( $this->text_start, $media_file['title'] ) );
    }

    protected function previous() {
        $actual_token = $this->input()->context()->audio_player()->get_token();
        $media_file   = $this->playlist_get_previous_by_token( $actual_token );

        $directive = $this->get_directive( $media_file );
        $this->output()->response()->add_directive( $directive );
        $this->output()->response()->output_speech()->set_text( sprintf( $this->text_start, $media_file['title'] ) );
    }

    protected function get_directive( $media_file ) {
        $directive = new Directive();
        $directive->set_play_behavior( 'REPLACE_ALL' );
        $directive->audio_item()->stream()->set_url( $media_file['url'] );
        $directive->audio_item()->stream()->set_token( $media_file['token'] );

        return $directive;
    }
}