Init

web/js/preferences.js

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+(function () {
+  const prefix = 'lan-play:release:v1:';
+
+  function folder(path) {
+    const index = path.lastIndexOf('/');
+    return index < 0 ? '' : path.slice(0, index);
+  }
+
+  function key(path) {
+    return `${prefix}${folder(path)}`;
+  }
+
+  function load(path) {
+    try { return JSON.parse(localStorage.getItem(key(path))) || {}; }
+    catch (_) { return {}; }
+  }
+
+  function store(path, value) {
+    try { localStorage.setItem(key(path), JSON.stringify(value)); } catch (_) {}
+  }
+
+  function label(track) {
+    const labels = track && track.labels || [];
+    const selected = labels.find((item) => item.text) || labels[0];
+    return selected && selected.text || track && track.label || '';
+  }
+
+  function descriptor(track, ordinal) {
+    if (!track) return { off: true };
+    return {
+      off: false,
+      lang: track.lang || track.language || '',
+      label: label(track),
+      roles: (track.roles || []).map((role) => role.value || role).filter(Boolean).sort(),
+      ordinal
+    };
+  }
+
+  function remember(path, type, track, ordinal) {
+    const profile = load(path);
+    profile[type] = descriptor(track, ordinal);
+    store(path, profile);
+  }
+
+  function find(path, type, tracks) {
+    const wanted = load(path)[type];
+    if (!wanted) return undefined;
+    if (wanted.off) return null;
+    const described = tracks.map((track, ordinal) => ({ track, ordinal, value: descriptor(track, ordinal) }));
+    let matches = described.filter((item) => wanted.lang && item.value.lang === wanted.lang);
+    if (wanted.label) {
+      const labeled = matches.filter((item) => item.value.label === wanted.label);
+      if (labeled.length) matches = labeled;
+    }
+    if (!matches.length && wanted.label) {
+      matches = described.filter((item) => item.value.label === wanted.label);
+    }
+    if (!matches.length && !wanted.lang && !wanted.label) matches = described;
+    return (matches.find((item) => item.ordinal === wanted.ordinal) || matches[0] || {}).track;
+  }
+
+  window.LanPlayPreferences = { folder, load, remember, find };
+})();