From 0610cca7b1c0b4b2cf97c898b2f776f8bf978dea Mon Sep 17 00:00:00 2001
From: Vito0912 <86927734+Vito0912@users.noreply.github.com>
Date: Thu, 25 Sep 2025 09:43:38 +0200
Subject: [PATCH] Add autoplay for next book in series after queue ends

---
 .../components/app/MediaPlayerContainer.vue   | 90 ++++++++++++++-----
 server/controllers/SeriesController.js        | 24 +++++
 server/routers/ApiRouter.js                   |  1 +
 3 files changed, 93 insertions(+), 22 deletions(-)

diff --git a/client/components/app/MediaPlayerContainer.vue b/client/components/app/MediaPlayerContainer.vue
index 1a2b1d30a..8de81d8c7 100644
--- a/client/components/app/MediaPlayerContainer.vue
+++ b/client/components/app/MediaPlayerContainer.vue
@@ -183,29 +183,75 @@ export default {
   methods: {
     mediaFinished(libraryItemId, episodeId) {
       // Play next item in queue
-      if (!this.playerQueueItems.length || !this.$store.state.playerQueueAutoPlay) {
-        // TODO: Set media finished flag so play button will play next queue item
-        return
-      }
-      var currentQueueIndex = this.playerQueueItems.findIndex((i) => {
-        if (episodeId) return i.libraryItemId === libraryItemId && i.episodeId === episodeId
-        return i.libraryItemId === libraryItemId
-      })
-      if (currentQueueIndex < 0) {
-        console.error('Media finished not found in queue - using first in queue', this.playerQueueItems)
-        currentQueueIndex = -1
-      }
-      if (currentQueueIndex === this.playerQueueItems.length - 1) {
-        console.log('Finished last item in queue')
-        return
-      }
-      const nextItemInQueue = this.playerQueueItems[currentQueueIndex + 1]
-      if (nextItemInQueue) {
-        this.playLibraryItem({
-          libraryItemId: nextItemInQueue.libraryItemId,
-          episodeId: nextItemInQueue.episodeId || null,
-          queueItems: this.playerQueueItems
+      if (this.playerQueueItems.length && this.$store.state.playerQueueAutoPlay) {
+        var currentQueueIndex = this.playerQueueItems.findIndex((i) => {
+          if (episodeId) return i.libraryItemId === libraryItemId && i.episodeId === episodeId
+          return i.libraryItemId === libraryItemId
         })
+        if (currentQueueIndex < 0) {
+          console.error('Media finished not found in queue - using first in queue', this.playerQueueItems)
+          currentQueueIndex = -1
+        }
+        if (currentQueueIndex < this.playerQueueItems.length - 1) {
+          const nextItemInQueue = this.playerQueueItems[currentQueueIndex + 1]
+          if (nextItemInQueue) {
+            this.playLibraryItem({
+              libraryItemId: nextItemInQueue.libraryItemId,
+              episodeId: nextItemInQueue.episodeId || null,
+              queueItems: this.playerQueueItems
+            })
+            return
+          }
+        }
+      }
+
+      // If no queue or queue is finished, try to play next book in series
+      if (this.$store.state.playerQueueAutoPlay && !episodeId && this.streamLibraryItem && this.streamLibraryItem.mediaType === 'book') {
+        this.checkAndPlayNextInSeries(libraryItemId)
+      }
+    },
+
+    async checkAndPlayNextInSeries(libraryItemId) {
+      const libraryItem = this.streamLibraryItem
+      if (!libraryItem || !libraryItem.media.metadata.series || !libraryItem.media.metadata.series.length) {
+        console.log('No series found for library item')
+        return
+      }
+
+      // Try to find next book in each series this book belongs to
+      for (const series of libraryItem.media.metadata.series) {
+        try {
+          const nextBook = await this.$axios.$get(`/api/series/${series.id}/next-book/${libraryItemId}`)
+          if (nextBook) {
+            console.log(`Playing next book in series "${series.name}":`, nextBook.media.metadata.title)
+
+            const queueItem = {
+              libraryItemId: nextBook.id,
+              libraryId: nextBook.libraryId,
+              episodeId: null,
+              title: nextBook.media.metadata.title || 'Unknown Title',
+              subtitle: (nextBook.media.metadata.authors || []).map((au) => au.name || 'Unknown Author').join(', '),
+              caption: series.name + (series.sequence ? ` #${series.sequence}` : ''),
+              duration: nextBook.media.duration || null,
+              coverPath: nextBook.media.coverPath || null
+            }
+
+            this.playLibraryItem({
+              libraryItemId: nextBook.id,
+              episodeId: null,
+              queueItems: [queueItem]
+            })
+            return
+          }
+        } catch (error) {
+          if (error.response?.status === 404) {
+            console.log(`No next book found in series "${series.name}"`)
+            continue
+          } else {
+            console.error('Error getting next book in series:', error)
+            continue
+          }
+        }
       }
     },
     setPlaying(isPlaying) {
diff --git a/server/controllers/SeriesController.js b/server/controllers/SeriesController.js
index 21c93f332..ba86571f5 100644
--- a/server/controllers/SeriesController.js
+++ b/server/controllers/SeriesController.js
@@ -86,6 +86,30 @@ class SeriesController {
     res.json(req.series.toOldJSON())
   }
 
+  /**
+   * GET: /api/series/:id/next-book/:libraryItemId
+   * Get the next book in a series after the given library item
+   *
+   * @param {SeriesControllerRequest} req
+   * @param {Response} res
+   */
+  async getNextBook(req, res) {
+    const currentLibraryItemId = req.params.libraryItemId
+    const libraryItems = req.libraryItemsInSeries
+
+    const currentBookIndex = libraryItems.findIndex((li) => li.id === currentLibraryItemId)
+    if (currentBookIndex === -1) {
+      return res.status(404).send('Current book not found in series')
+    }
+
+    if (currentBookIndex >= libraryItems.length - 1) {
+      return res.status(404).send('No next book in series')
+    }
+
+    const nextBook = libraryItems[currentBookIndex + 1]
+    res.json(nextBook.toOldJSONExpanded())
+  }
+
   /**
    *
    * @param {RequestWithUser} req
diff --git a/server/routers/ApiRouter.js b/server/routers/ApiRouter.js
index 6446ecc80..71070484b 100644
--- a/server/routers/ApiRouter.js
+++ b/server/routers/ApiRouter.js
@@ -222,6 +222,7 @@ class ApiRouter {
     //
     this.router.get('/series/:id', SeriesController.middleware.bind(this), SeriesController.findOne.bind(this))
     this.router.patch('/series/:id', SeriesController.middleware.bind(this), SeriesController.update.bind(this))
+    this.router.get('/series/:id/next-book/:libraryItemId', SeriesController.middleware.bind(this), SeriesController.getNextBook.bind(this))
 
     //
     // Playback Session Routes