Resolve "Improve create playlist from existing playlist"

Closes #8 (closed)

public/index.php

@@ -49,17 +49,17 @@ $templateData = [
   'errors' => [],
 ];
 
-$selectedPlaylistId = '';
-if (isset($_GET['playlist'])) {
-    $selectedPlaylistId = $_GET['playlist'];
-}
-
+$generatePlaylistFromPlaylist = isset($_GET['generate-playlist-from-playlist']);
 $generatePlaylistFromArtists = isset($_GET['generate-playlist-top-artists']);
 
-if ($selectedPlaylistId) {
-    $playlist = $api->getPlaylist($selectedPlaylistId);
-    error_log('Will create new playlist from tracks in playlist '.$selectedPlaylistId.' "'.$playlist->name.'".');
+if ($generatePlaylistFromPlaylist) {
+    $selectedPlaylists = $_GET['selected-playlist'];
+    error_log('Will create new playlist with recommendations from playlists: '.join(', ', $selectedPlaylists).'".');
     $recommendedTrackIds = [];
+
+    foreach ($selectedPlaylists as $selectedPlaylistId) {
+        $playlist = $api->getPlaylist($selectedPlaylistId);
+        error_log('Will get recommendations from tracks in playlist '.$selectedPlaylistId.' "'.$playlist->name.'".');
         $playlistTracks = $playlist->tracks->items;
         error_log('Found '.count($playlistTracks).' tracks.');
         foreach ($playlistTracks as $track) {
@@ -78,6 +78,8 @@ if ($selectedPlaylistId) {
                 $recommendedTrackIds[$recommendedTrack->id] = 1;
             }
         }
+    }
+
     $recommendedTrackIds = array_keys($recommendedTrackIds);
     error_log('=> Got '.count($recommendedTrackIds).' unique recommendatations for this playlist.');
     shuffle($recommendedTrackIds);
@@ -136,7 +138,7 @@ if ($selectedPlaylistId) {
     $templateData['infos'][] = 'Ok created new playlist with '.count($pickedTrackIds).' tracks: '.$playlistLink;
 } else {
     $templateData['topArtists'] = $api->getMyTop('artists', ['limit' => 16, 'time_range' => 'short_term'])->items;
-    $templateData['playlists'] = $api->getUserPlaylists($user->id)->items;
+    $templateData['playlists'] = $api->getUserPlaylists($user->id, ['limit' => 30])->items;
 }
 
 require '../template.php';