107 lines
2.6 KiB
Go
107 lines
2.6 KiB
Go
/*
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* MumbleDJ
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* By Matthieu Grieger
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* songqueue.go
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* Copyright (c) 2014, 2015 Matthieu Grieger (MIT License)
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*/
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package main
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import (
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"errors"
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"fmt"
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"time"
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)
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// SongQueue type declaration.
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type SongQueue struct {
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queue []Song
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}
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// NewSongQueue initializes a new queue and returns it.
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func NewSongQueue() *SongQueue {
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return &SongQueue{
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queue: make([]Song, 0),
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}
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}
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// AddSong adds a Song to the SongQueue.
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func (q *SongQueue) AddSong(s Song) error {
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beforeLen := q.Len()
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q.queue = append(q.queue, s)
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if len(q.queue) == beforeLen+1 {
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return nil
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}
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return errors.New("Could not add Song to the SongQueue.")
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}
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// CurrentSong returns the current Song.
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func (q *SongQueue) CurrentSong() Song {
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return q.queue[0]
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}
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// NextSong moves to the next Song in SongQueue. NextSong() removes the first Song in the queue.
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func (q *SongQueue) NextSong() {
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if !isNil(q.CurrentSong().Playlist()) {
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if s, err := q.PeekNext(); err == nil {
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if !isNil(s.Playlist()) {
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if q.CurrentSong().Playlist().ID() != s.Playlist().ID() {
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q.CurrentSong().Playlist().DeleteSkippers()
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}
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}
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} else {
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q.CurrentSong().Playlist().DeleteSkippers()
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}
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}
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q.queue = q.queue[1:]
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}
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// PeekNext peeks at the next Song and returns it.
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func (q *SongQueue) PeekNext() (Song, error) {
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if q.Len() > 1 {
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return q.queue[1], nil
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}
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return nil, errors.New("There isn't a Song coming up next.")
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}
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// Len returns the length of the SongQueue.
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func (q *SongQueue) Len() int {
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return len(q.queue)
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}
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// Traverse is a traversal function for SongQueue. Allows a visit function to be passed in which performs
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// the specified action on each queue item.
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func (q *SongQueue) Traverse(visit func(i int, s Song)) {
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for sQueue, queueSong := range q.queue {
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visit(sQueue, queueSong)
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}
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}
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// OnSongFinished event. Deletes Song that just finished playing, then queues the next Song (if exists).
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func (q *SongQueue) OnSongFinished() {
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resetOffset, _ := time.ParseDuration(fmt.Sprintf("%ds", 0))
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dj.audioStream.Offset = resetOffset
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if q.Len() != 0 {
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if dj.queue.CurrentSong().DontSkip() == true {
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dj.queue.CurrentSong().SetDontSkip(false)
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q.PrepareAndPlayNextSong()
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} else {
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q.NextSong()
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if q.Len() != 0 {
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q.PrepareAndPlayNextSong()
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}
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}
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}
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}
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// PrepareAndPlayNextSong prepares next song and plays it if the download succeeds.
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// Otherwise the function will print an error message to the channel and skip to the next song.
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func (q *SongQueue) PrepareAndPlayNextSong() {
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if err := q.CurrentSong().Download(); err == nil {
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q.CurrentSong().Play()
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} else {
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dj.client.Self.Channel.Send(AUDIO_FAIL_MSG, false)
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q.OnSongFinished()
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}
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}
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