From a950e4c82bd458e924b00698a77c06275a64a46c Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Wed, 5 Aug 2020 11:02:14 +0200
Subject: Add previous button

---
 client/src/standalone/videos/embed.ts | 39 ++++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)

(limited to 'client/src/standalone')

diff --git a/client/src/standalone/videos/embed.ts b/client/src/standalone/videos/embed.ts
index 17b0ee9ef..786d749a4 100644
--- a/client/src/standalone/videos/embed.ts
+++ b/client/src/standalone/videos/embed.ts
@@ -309,13 +309,13 @@ export class PeerTubeEmbed {
       cancelText: peertubeTranslate('Cancel', translations),
       suspendedText: peertubeTranslate('Autoplay is suspended', translations),
       getTitle: () => this.nextVideoTitle(),
-      next: () => this.autoplayNext(),
+      next: () => this.playNextVideo(),
       condition: () => !!this.getNextPlaylistElement(),
       suspended: () => false
     })
   }
 
-  private async autoplayNext () {
+  private async playNextVideo () {
     const next = this.getNextPlaylistElement()
     if (!next) {
       console.log('Next element not found in playlist.')
@@ -327,6 +327,18 @@ export class PeerTubeEmbed {
     return this.loadVideoAndBuildPlayer(this.currentPlaylistElement.video.uuid)
   }
 
+  private async playPreviousVideo () {
+    const previous = this.getPreviousPlaylistElement()
+    if (!previous) {
+      console.log('Previous element not found in playlist.')
+      return
+    }
+
+    this.currentPlaylistElement = previous
+
+    return this.loadVideoAndBuildPlayer(this.currentPlaylistElement.video.uuid)
+  }
+
   private async loadVideoAndBuildPlayer (uuid: string) {
     const res = await this.loadVideo(uuid)
     if (res === undefined) return
@@ -357,6 +369,22 @@ export class PeerTubeEmbed {
     return next
   }
 
+  private getPreviousPlaylistElement (position?: number): VideoPlaylistElement {
+    if (!position) position = this.currentPlaylistElement.position -1
+
+    if (position < 1) {
+      return undefined
+    }
+
+    const prev = this.playlistElements.find(e => e.position === position)
+
+    if (!prev || !prev.video) {
+      return this.getNextPlaylistElement(position - 1)
+    }
+
+    return prev
+  }
+
   private async buildVideoPlayer (videoResponse: Response, captionsPromise: Promise<Response>) {
     let alreadyHadPlayer = false
 
@@ -418,7 +446,12 @@ export class PeerTubeEmbed {
         stopTime: this.stopTime,
         subtitle: this.subtitle,
 
-        nextVideo: () => this.autoplayNext(),
+        nextVideo: this.playlist ? () => this.playNextVideo() : undefined,
+        hasNextVideo: this.playlist ? () => !!this.getNextPlaylistElement() : undefined,
+
+        previousVideo: this.playlist ? () => this.playPreviousVideo() : undefined,
+        hasPreviousVideo: this.playlist ? () => !!this.getPreviousPlaylistElement() : undefined,
+
         playlist: playlistPlugin,
 
         videoCaptions,
-- 
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