SPA playlist transitions — no page refresh on track change

- Add GET /videos/{video}/player-data JSON endpoint returning stream URL,
  cover, slides, title, duration (used by client-side SPA transitions)
- Replace music playlist JS with full SPA system: plTransitionTo() swaps
  audio.src in-place (preserving browser autoplay permission), updates
  cover art, resets progress bar, then background-fetches the new page
  to swap #vdbWrap (description) and #ytcSection (comments) via DOMParser
- plSwapContent() re-runs the YTC comments IIFE after swapping innerHTML
  so comments load correctly for the new video
- Prev/next/shuffle/loop/autoplay controls now computed dynamically from
  PL_VIDEOS array — buttons stay correct after each SPA transition
- Sidebar shows ALL playlist tracks (removed @if filter); current track
  highlighted in red; clicking any card triggers SPA transition
- Browser back/forward handled via popstate + history.pushState

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Http/Controllers/VideoController.php

@@ -465,6 +465,33 @@ class VideoController extends Controller
             ->withCookie(cookie('_did', $did, 60 * 24 * 365 * 5));
     }
 
+    public function playerData(Video $video, Request $request)
+    {
+        if (! $video->canView(Auth::user())) {
+            abort(403);
+        }
+
+        $coverUrl = $video->thumbnail
+            ? route('media.thumbnail', $video->thumbnail)
+            : asset('storage/images/logo.png');
+
+        $slides = $video->slides->count() > 1
+            ? $video->slides->map(fn ($s) => route('media.thumbnail', $s->filename))->values()->all()
+            : [];
+
+        return response()->json([
+            'id'         => $video->id,
+            'key'        => $video->getRouteKey(),
+            'type'       => $video->type,
+            'stream_url' => route('videos.stream', $video),
+            'cover_url'  => $coverUrl,
+            'slides'     => $slides,
+            'title'      => $video->title,
+            'author'     => $video->user->name ?? '',
+            'duration'   => $video->duration,
+        ]);
+    }
+
     public function matchData(Video $video)
     {
         if (! $video->canView(Auth::user())) {

resources/views/videos/types/music.blade.php

@@ -299,6 +299,14 @@
             gap: 8px;
             margin-bottom: 8px;
             cursor: pointer;
+            border-radius: 8px;
+            padding: 4px;
+            transition: background .15s;
+        }
+
+        .sidebar-video-card.current-video {
+            background: rgba(239,68,68,.12);
+            border-left: 3px solid #ef4444;
         }
 
         .sidebar-thumb {
@@ -479,12 +487,10 @@
 
                 {{-- Playlist controls --}}
                 <div class="pl-controls-bar">
-                    <button class="pl-ctrl-btn" id="plPrevBtn" title="Previous"
+                    <button class="pl-ctrl-btn" id="plPrevBtn" title="Previous" onclick="window.plPrev()">
-                        @if(!($previousVideo ?? null)) disabled @endif
-                        onclick="plGoTo('{{ ($previousVideo ?? null) ? route('videos.show', $previousVideo).'?playlist='.$playlist->share_token : '' }}')">
                         <i class="bi bi-skip-start-fill"></i>
                     </button>
-                    <button class="pl-ctrl-btn" id="plNextBtn" title="Next" onclick="plNext()">
+                    <button class="pl-ctrl-btn" id="plNextBtn" title="Next" onclick="window.plNext()">
                         <i class="bi bi-skip-end-fill"></i>
                     </button>
                     <div class="pl-ctrl-divider"></div>
@@ -504,9 +510,6 @@
                 (function () {
                 var PL_ID      = '{{ $playlist->share_token }}';
                 var PL_CURRENT = {{ $video->id }};
-                var PL_NEXT_URL = '{{ ($nextVideo ?? null) ? route("videos.show", $nextVideo)."?playlist=".$playlist->share_token : "" }}';
-                var PL_PREV_URL = '{{ ($previousVideo ?? null) ? route("videos.show", $previousVideo)."?playlist=".$playlist->share_token : "" }}';
-                var PL_FIRST_URL= '{{ $playlistVideos->count() ? route("videos.show", $playlistVideos->first())."?playlist=".$playlist->share_token : "" }}';
                 var PL_VIDEOS  = {!! $playlistVideos->map(fn($v) => ['id' => $v->id, 'url' => route('videos.show', $v).'?playlist='.$playlist->share_token])->values()->toJson() !!};
 
                 function plGet(k,d){ var v=localStorage.getItem('pl_'+k+'_'+PL_ID); return v!==null?v:d; }
@@ -515,36 +518,132 @@
                 var plAutoplay     = plGet('autoplay','1');
                 var plLoop         = plGet('loop','off');
                 var plShuffle      = plGet('shuffle','0');
+                var plTransiting   = false;
 
+                // ── shuffle helpers ──────────────────────────────────────
                 function plShuffleOrder(){ var o=PL_VIDEOS.map(function(_,i){return i;}); for(var i=o.length-1;i>0;i--){var j=Math.floor(Math.random()*(i+1));var t=o[i];o[i]=o[j];o[j]=t;} localStorage.setItem('pl_shuffleOrder_'+PL_ID,JSON.stringify(o)); return o; }
                 function plGetOrder(){ var r=localStorage.getItem('pl_shuffleOrder_'+PL_ID); if(r){try{return JSON.parse(r);}catch(e){}} return null; }
 
-                window.plGoTo = function(url){ if(url) window.location.href=url; };
+                // ── compute adjacent URLs from current state ──────────────
-                window.plNext = function(){
+                function plAdj(curId) {
-                    if(plShuffle==='1'){
+                    var idx = PL_VIDEOS.findIndex(function(v){ return v.id===curId; });
-                        var order=plGetOrder()||plShuffleOrder();
+                    if (plShuffle==='1') {
-                        var curIdx=PL_VIDEOS.findIndex(function(v){return v.id===PL_CURRENT;});
+                        var ord=plGetOrder()||plShuffleOrder();
-                        var pos=order.indexOf(curIdx);
+                        var pos=ord.indexOf(idx);
-                        var nxt=(pos+1)%order.length;
+                        var prevPos=pos>0?pos-1:(plLoop==='all'?ord.length-1:-1);
-                        if(pos===order.length-1&&plLoop!=='all') return;
+                        var nextPos=pos<ord.length-1?pos+1:(plLoop==='all'?0:-1);
-                        window.location.href=PL_VIDEOS[order[nxt]].url;
+                        return { prev: prevPos>=0?PL_VIDEOS[ord[prevPos]].url:'', next: nextPos>=0?PL_VIDEOS[ord[nextPos]].url:'' };
-                    } else {
-                        if(PL_NEXT_URL) window.location.href=PL_NEXT_URL;
-                        else if(plLoop==='all'&&PL_FIRST_URL) window.location.href=PL_FIRST_URL;
                     }
+                    return {
+                        prev: idx>0?PL_VIDEOS[idx-1].url:'',
+                        next: idx<PL_VIDEOS.length-1?PL_VIDEOS[idx+1].url:(plLoop==='all'?PL_VIDEOS[0].url:'')
                     };
+                }
 
-                window._plOnTrackEnd = function(){
+                // ── time formatter ───────────────────────────────────────
-                    if(plLoop==='one') return; // native loop handles it
+                function plFmt(s){ var m=Math.floor(s/60),ss=Math.floor(s%60); return m+':'+(ss<10?'0':'')+ss; }
-                    if(plAutoplay==='1') window.plNext();
-                };
 
+                // ── SPA transition — swap audio src + update UI ───────────
+                async function plTransitionTo(url, pushHist) {
+                    if (!url || plTransiting) return;
+                    plTransiting = true;
+                    try {
+                        var m = url.match(/\/videos\/([^/?#]+)/);
+                        if (!m) { window.location.href=url; return; }
+                        var qs = url.indexOf('?')!==-1 ? url.substring(url.indexOf('?')) : '';
+                        var resp = await fetch('/videos/'+m[1]+'/player-data'+qs);
+                        if (!resp.ok) { window.location.href=url; return; }
+                        var d = await resp.json();
+
+                        // swap audio src (keeps browser autoplay permission)
+                        var audio = document.getElementById('audioEl');
+                        if (audio) { audio.src=d.stream_url; audio.load(); }
+
+                        // update cover / slideshow
+                        var ci = document.getElementById('audioCoverImg');
+                        if (ci) ci.src = d.cover_url;
+                        var sa = document.getElementById('slideA');
+                        if (sa) sa.src = d.cover_url;
+
+                        // reset progress
+                        var pl=document.getElementById('ytpPlayed'), sc=document.getElementById('ytpScrubber');
+                        var cu=document.getElementById('ytpCurrent'), dr=document.getElementById('ytpDuration');
+                        if(pl) pl.style.width='0%';
+                        if(sc) sc.style.left='0%';
+                        if(cu) cu.textContent='0:00';
+                        if(dr&&d.duration) dr.textContent=plFmt(d.duration);
+
+                        // update visible title
+                        var ts=document.querySelector('.video-title span');
+                        if(ts) ts.textContent=d.title;
+                        document.title=d.title+' | {{ config("app.name") }}';
+
+                        // update state
+                        PL_CURRENT = d.id;
+                        if(audio&&plLoop==='one') audio.loop=true; else if(audio) audio.loop=false;
+                        plRender();
+                        plHighlight(d.id);
+
+                        // history
+                        if(pushHist!==false) history.pushState({plVideoId:d.id,url:url},'',url);
+
+                        // play (user already interacted — browser allows this)
+                        if(audio) audio.play().catch(function(){});
+
+                        // async: swap description + comments from fetched page
+                        plSwapContent(url);
+                    } catch(e) {
+                        console.warn('plTransitionTo',e);
+                        window.location.href=url;
+                    } finally {
+                        plTransiting=false;
+                    }
+                }
+
+                // ── background page swap: description + comments ──────────
+                async function plSwapContent(url) {
+                    try {
+                        var resp = await fetch(url, {headers:{'Accept':'text/html','X-Requested-With':'XMLHttpRequest'}});
+                        var html = await resp.text();
+                        var doc  = new DOMParser().parseFromString(html,'text/html');
+
+                        // swap description box
+                        var nv=doc.getElementById('vdbWrap'), ov=document.getElementById('vdbWrap');
+                        if(nv&&ov) ov.innerHTML=nv.innerHTML;
+
+                        // swap channel row
+                        var nc=doc.querySelector('.channel-row'), oc=document.querySelector('.channel-row');
+                        if(nc&&oc) oc.innerHTML=nc.innerHTML;
+
+                        // swap comments (HTML + re-run its init script)
+                        var ny=doc.getElementById('ytcSection'), oy=document.getElementById('ytcSection');
+                        if(ny&&oy) {
+                            oy.innerHTML=ny.innerHTML;
+                            var ytcScript=Array.from(doc.querySelectorAll('script')).find(function(s){return s.textContent.includes('const YTC =');});
+                            if(ytcScript){
+                                var ns=document.createElement('script');
+                                ns.textContent=ytcScript.textContent;
+                                document.body.appendChild(ns);
+                                document.body.removeChild(ns);
+                            }
+                        }
+                    } catch(e){ console.warn('plSwapContent',e); }
+                }
+
+                // ── sidebar highlight ────────────────────────────────────
+                function plHighlight(activeId) {
+                    document.querySelectorAll('.sidebar-video-card[data-pl-id]').forEach(function(c){
+                        c.classList.toggle('current-video', parseInt(c.dataset.plId)===activeId);
+                    });
+                    var active=document.querySelector('.sidebar-video-card.current-video');
+                    if(active) active.scrollIntoView({behavior:'smooth',block:'nearest'});
+                }
+
+                // ── render control button states ─────────────────────────
                 function plRender(){
-                    var sb=document.getElementById('plShuffleBtn');
+                    var adj=plAdj(PL_CURRENT);
-                    var lb=document.getElementById('plLoopBtn');
+                    var sb=document.getElementById('plShuffleBtn'),lb=document.getElementById('plLoopBtn');
-                    var ab=document.getElementById('plAutoplayBtn');
+                    var ab=document.getElementById('plAutoplayBtn'),nb=document.getElementById('plNextBtn'),pb=document.getElementById('plPrevBtn');
-                    var nb=document.getElementById('plNextBtn');
-                    var pb=document.getElementById('plPrevBtn');
                     if(sb){ sb.classList.toggle('pl-ctrl-active',plShuffle==='1'); sb.title='Shuffle: '+(plShuffle==='1'?'On':'Off'); }
                     if(lb){
                         lb.classList.remove('pl-ctrl-active');
@@ -553,29 +652,41 @@
                         else { lb.innerHTML='<i class="bi bi-repeat"></i>'; lb.title='Loop: Off'; }
                     }
                     if(ab){ ab.classList.toggle('pl-ctrl-active',plAutoplay==='1'); ab.title='Autoplay: '+(plAutoplay==='1'?'On':'Off'); }
-                    if(nb) nb.disabled=!PL_NEXT_URL&&plLoop!=='all'&&plShuffle!=='1';
+                    if(nb) nb.disabled=!adj.next;
-                    if(pb) pb.disabled=!PL_PREV_URL;
+                    if(pb) pb.disabled=!adj.prev;
                 }
 
+                // ── public API ────────────────────────────────────────────
+                window.plGoTo = function(url){ if(url) plTransitionTo(url); };
+                window.plNext = function(){ var a=plAdj(PL_CURRENT); if(a.next) plTransitionTo(a.next); };
+                window.plPrev = function(){ var a=plAdj(PL_CURRENT); if(a.prev) plTransitionTo(a.prev); };
+                window._plOnTrackEnd = function(){ if(plLoop==='one') return; if(plAutoplay==='1') window.plNext(); };
+
                 window.plToggleShuffle  = function(){ plShuffle=plShuffle==='1'?'0':'1'; plSet('shuffle',plShuffle); if(plShuffle==='1') plShuffleOrder(); else localStorage.removeItem('pl_shuffleOrder_'+PL_ID); plRender(); };
                 window.plToggleLoop     = function(){ var s=['off','all','one']; var i=s.indexOf(plLoop); plLoop=s[(i+1)%s.length]; plSet('loop',plLoop); plRender(); var a=document.getElementById('audioEl'); if(a) a.loop=(plLoop==='one'); };
-                window.plToggleAutoplay= function(){ plAutoplay=plAutoplay==='1'?'0':'1'; plSet('autoplay',plAutoplay); plRender(); };
+                window.plToggleAutoplay = function(){ plAutoplay=plAutoplay==='1'?'0':'1'; plSet('autoplay',plAutoplay); plRender(); };
 
-                // Apply state after audio player is ready
+                // ── browser back/forward ──────────────────────────────────
-                document.addEventListener('DOMContentLoaded', function(){
+                window.addEventListener('popstate', function(e){ if(e.state&&e.state.url) plTransitionTo(e.state.url, false); });
+
+                // ── init ──────────────────────────────────────────────────
+                function plInit(){
                     var a=document.getElementById('audioEl');
                     if(a&&plLoop==='one') a.loop=true;
                     plRender();
-                });
+                    plHighlight(PL_CURRENT);
-                if(document.readyState!=='loading'){ var a=document.getElementById('audioEl'); if(a&&plLoop==='one') a.loop=true; plRender(); }
+                }
+                if(document.readyState==='loading') document.addEventListener('DOMContentLoaded',plInit); else plInit();
                 })();
                 </script>
 
                 <div class="recommended-videos-list">
                     @foreach ($playlistVideos as $index => $playlistVideo)
-                        @if ($playlistVideo->id !== $video->id)
+                        @php $isCurrentTrack = $playlistVideo->id === $video->id; @endphp
-                            <div class="sidebar-video-card{{ $playlistVideo->id === $video->id ? ' current-video' : '' }}"
+                        <div class="sidebar-video-card{{ $isCurrentTrack ? ' current-video' : '' }}"
-                                onclick="window.location.href='{{ route('videos.show', $playlistVideo) }}?playlist={{ $playlist->share_token }}'">
+                            data-pl-id="{{ $playlistVideo->id }}"
+                            onclick="plGoTo('{{ route('videos.show', $playlistVideo) }}?playlist={{ $playlist->share_token }}')"
+                            style="cursor:pointer;">
                                 <div class="sidebar-thumb" style="position: relative;">
                                     @if ($playlistVideo->thumbnail)
                                         <img src="{{ route('media.thumbnail', $playlistVideo->thumbnail) }}"
@@ -613,7 +724,6 @@
                                     </div>
                                 </div>
                             </div>
-                        @endif
                     @endforeach
                 </div>
                 @if ($playlist->canEdit(Auth::user()))

routes/web.php

@@ -45,6 +45,7 @@ Route::get('/videos/{video}/download-mp3', [VideoController::class, 'downloadMp3
 Route::post('/videos/{video}/slideshow/generate', [VideoController::class, 'slideshowGenerate'])->name('videos.slideshow.generate');
 Route::get('/videos/{video}/slideshow/progress', [VideoController::class, 'slideshowProgress'])->name('videos.slideshow.progress');
 Route::get('/videos/{video}/recommendations', [VideoController::class, 'recommendations'])->name('videos.recommendations');
+Route::get('/videos/{video}/player-data', [VideoController::class, 'playerData'])->name('videos.playerData');
 Route::post('/videos/{video}/share', [VideoController::class, 'recordShare'])->name('videos.recordShare');
 Route::get('/videos/{video}/og-image', [VideoController::class, 'ogImage'])->name('videos.ogImage');
 Route::get('/s/{token}', [VideoController::class, 'accessShare'])->name('share.access');