<!-- TRACES: UR-023, UR-025, UR-027, UR-029, UR-057 | DR-030, DR-048, DR-077, DR-086, DR-132 -->
<script lang="ts">
  import { onDestroy, onMount } from "svelte";
  import { commands } from "$lib/api/bindings";
  import type {
    AudioSettings,
    CacheConfig,
    EqPreset,
    StreamingQuality,
    VideoSettings,
    VolumeLevel,
  } from "$lib/api/bindings";
  import {
    getCacheStats,
    setCacheLimit,
    clearCache,
    formatBytes,
    gbToBytes,
    bytesToGb,
    type ImageCacheStats,
  } from "$lib/services/imageCache";
  import { getCacheConfig, updateCacheConfig } from "$lib/services/preload";
  import SearchGroupOrderList from "$lib/components/settings/SearchGroupOrderList.svelte";
  import PendingSyncList from "$lib/components/sync/PendingSyncList.svelte";
  import { library, viewMode } from "$lib/stores/library";
  import {
    isNetworkDetectionSupported,
    reportNetworkState,
  } from "$lib/services/networkType";
  import { experimentalNativeVideo } from "$lib/stores/nativeVideo";
  import { getPlaybackCapabilities } from "$lib/services/playbackCapabilities";

  const episodeLimitOptions = [
    { value: 0, label: "Unlimited" },
    { value: 1, label: "1" },
    { value: 2, label: "2" },
    { value: 3, label: "3" },
    { value: 5, label: "5" },
    { value: 10, label: "10" },
  ];

  let settings = $state<AudioSettings>({
    crossfadeDuration: 0,
    gaplessPlayback: true,
    normalizeVolume: false,
    volumeLevel: "normal",
    equalizerEnabled: false,
    equalizerBands: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  });

  // Equalizer band centre-frequency labels (must match Rust EQ_BANDS order).
  // Presentation only — the gain curves themselves come from the backend.
  const EQ_BAND_LABELS = ["31", "62", "125", "250", "500", "1k", "2k", "4k", "8k", "16k"];
  const EQ_GAIN_MIN = -12;
  const EQ_GAIN_MAX = 12;
  // Preset name → gain curve, fetched from the backend (domain data lives in Rust).
  let eqPresets = $state<[EqPreset, number[]][]>([]);
  // Non-optional view of the bands for template bindings (the wire type marks
  // equalizerBands optional via serde default; loadSettings guarantees it dense).
  const eqBands = $derived(settings.equalizerBands ?? [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);

  let videoSettings = $state<VideoSettings>({
    autoPlayNextEpisode: true,
    autoPlayCountdownSeconds: 10,
    autoPlayMaxEpisodes: 0,
    streamingQuality: "original",
  });

  // Bandwidth ceilings offered by the streaming-quality picker, as
  // [variant, label, detail] — the numbers behind each step are Jellyfin
  // encoding vocabulary, so Rust serves the list. TRACES: UR-074 | DR-162
  let streamingQualities = $state<[StreamingQuality, string, string][]>([]);

  // Download/caching behaviour, incl. the WiFi-only gate (UR-053).
  let cacheConfig = $state<CacheConfig>({
    queuePrecacheEnabled: true,
    queuePrecacheCount: 3,
    albumAffinityEnabled: true,
    albumAffinityThreshold: 3,
    storageLimit: 10 * 1024 * 1024 * 1024,
    wifiOnly: false,
    // Placeholder only — replaced by the backend's value on load. How long a
    // temporary (auto-cached) download lives before it is reclaimed; the policy
    // itself is Rust's (DR-127).
    temporaryTtlHours: 24 * 7,
  });

  // Whether the platform can actually detect the network type. On desktop it
  // can't, so the WiFi-only toggle would be inert — we disable and explain it
  // rather than offering a switch that does nothing.
  let networkDetectionSupported = $state(false);

  let loading = $state(true);

  // Image cache state
  let cacheStats = $state<ImageCacheStats | null>(null);
  let cacheLoading = $state(false);
  let clearingCache = $state(false);

  // Cache limit options in bytes
  const cacheLimitOptions = [
    { label: "500 MB", bytes: gbToBytes(0.5) },
    { label: "1 GB", bytes: gbToBytes(1), default: true },
    { label: "2 GB", bytes: gbToBytes(2) },
    { label: "5 GB", bytes: gbToBytes(5) },
    { label: "Unlimited", bytes: 0 },
  ];

  // Native-video opt-in (Android). `supportsNativeVideo` comes from Rust, which
  // owns the "does this platform have a native video surface" decision; the
  // toggle is hidden entirely where it cannot apply.
  let supportsNativeVideo = $state(false);
  let nativeVideoEnabled = $state(false);

  const unsubscribeNativeVideo = experimentalNativeVideo.subscribe((v) => {
    nativeVideoEnabled = v;
  });

  function handleNativeVideoToggle() {
    experimentalNativeVideo.set(!nativeVideoEnabled);
  }

  // Not returned from onMount: that callback is async, so its return value is a
  // Promise and Svelte would never invoke it as a teardown.
  onDestroy(unsubscribeNativeVideo);

  onMount(async () => {
    await loadSettings();
    supportsNativeVideo = (await getPlaybackCapabilities()).supportsNativeVideo;
  });

  async function loadSettings() {
    try {
      loading = true;
      networkDetectionSupported = isNetworkDetectionSupported();
      const [audioResult, videoResult, cacheResult, presets, qualities] = await Promise.all([
        commands.playerGetAudioSettings(),
        commands.playerGetVideoSettings(),
        getCacheConfig(),
        commands.playerGetEqPresets(),
        commands.playerGetStreamingQualities(),
      ]);
      // equalizerBands is optional on the wire (serde default); guarantee a
      // dense 10-band array so the slider bindings are never undefined.
      settings = {
        ...audioResult,
        equalizerBands: audioResult.equalizerBands ?? [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
      };
      videoSettings = videoResult;
      cacheConfig = cacheResult;
      eqPresets = presets;
      streamingQualities = qualities;
      // Load cache stats in parallel but don't block on it
      loadCacheStats();
    } catch (e) {
      console.error("Failed to load settings:", e);
    } finally {
      loading = false;
    }
  }

  async function loadCacheStats() {
    try {
      cacheLoading = true;
      cacheStats = await getCacheStats();
    } catch (e) {
      console.error("Failed to load cache stats:", e);
    } finally {
      cacheLoading = false;
    }
  }

  async function handleCacheLimitChange(limitBytes: number) {
    try {
      await setCacheLimit(limitBytes);
      // Reload stats to reflect new limit
      await loadCacheStats();
    } catch (e) {
      console.error("Failed to set cache limit:", e);
    }
  }

  async function handleClearCache() {
    try {
      clearingCache = true;
      await clearCache();
      await loadCacheStats();
    } catch (e) {
      console.error("Failed to clear cache:", e);
    } finally {
      clearingCache = false;
    }
  }

  // Get the current selected limit option
  function isCurrentLimit(optionBytes: number): boolean {
    if (!cacheStats) return false;
    // Unlimited is 0
    if (optionBytes === 0 && cacheStats.limitBytes === 0) return true;
    // Allow small tolerance for floating point
    return Math.abs(cacheStats.limitBytes - optionBytes) < 1000;
  }

  // Calculate cache usage percentage
  function getCacheUsagePercent(): number {
    if (!cacheStats || cacheStats.limitBytes === 0) return 0;
    return Math.min(100, (cacheStats.totalSizeBytes / cacheStats.limitBytes) * 100);
  }

  // Settings apply the moment the user changes a control — there is no Save
  // button. Each helper writes just the settings group it owns so a single
  // toggle doesn't re-push unrelated state.
  async function persistAudio() {
    try {
      await commands.playerSetAudioSettings(settings);
    } catch (e) {
      console.error("Failed to save audio settings:", e);
    }
  }

  async function persistVideo() {
    try {
      await commands.playerSetVideoSettings(videoSettings);
    } catch (e) {
      console.error("Failed to save video settings:", e);
    }
  }

  async function persistCache() {
    try {
      await updateCacheConfig(cacheConfig);
      // Re-report the network so the backend re-evaluates the gate against the
      // just-changed wifi-only preference, releasing or holding the queue now
      // rather than at the next network change.
      await reportNetworkState();
    } catch (e) {
      console.error("Failed to save download settings:", e);
    }
  }

  // Slider drags fire `input` on every tick; update the live display there but
  // only persist on `change` (pointer release) so we don't spam the backend.
  function handleCrossfadeInput(e: Event) {
    const target = e.target as HTMLInputElement;
    settings.crossfadeDuration = parseFloat(target.value);
  }

  function handleCrossfadeChange(e: Event) {
    const target = e.target as HTMLInputElement;
    settings.crossfadeDuration = parseFloat(target.value);
    persistAudio();
  }

  function handleGaplessToggle() {
    settings.gaplessPlayback = !settings.gaplessPlayback;
    persistAudio();
  }

  function handleNormalizeToggle() {
    settings.normalizeVolume = !settings.normalizeVolume;
    persistAudio();
  }

  function handleVolumeLevelChange(level: VolumeLevel) {
    settings.volumeLevel = level;
    persistAudio();
  }

  // --- Equalizer (UR-027) ---

  function handleEqToggle() {
    settings.equalizerEnabled = !settings.equalizerEnabled;
    persistAudio();
  }

  // Apply a preset's gain curve (from the backend) to the bands.
  function handleEqPreset(gains: number[]) {
    settings.equalizerBands = [...gains];
    persistAudio();
  }

  // Live-update a single band while dragging; persist on release (change).
  function handleEqBandInput(index: number, e: Event) {
    const target = e.target as HTMLInputElement;
    const bands = [...eqBands];
    bands[index] = parseFloat(target.value);
    settings.equalizerBands = bands;
  }

  function handleEqBandChange(index: number, e: Event) {
    const target = e.target as HTMLInputElement;
    const bands = [...eqBands];
    bands[index] = parseFloat(target.value);
    settings.equalizerBands = bands;
    persistAudio();
  }

  // The name of the preset whose curve matches the current bands, or null
  // ("Custom"). Presentation-only label — the backend defines the curves.
  const activeEqPreset = $derived.by<EqPreset | null>(() => {
    const eq = eqBands;
    for (const [name, gains] of eqPresets) {
      if (gains.length === eq.length && gains.every((g, i) => g === eq[i])) {
        return name;
      }
    }
    return null;
  });

  // Human labels for preset chips.
  const EQ_PRESET_LABELS: Record<EqPreset, string> = {
    flat: "Flat",
    rock: "Rock",
    pop: "Pop",
    jazz: "Jazz",
    classical: "Classical",
    bassBoost: "Bass Boost",
    trebleBoost: "Treble Boost",
    vocal: "Vocal",
  };

  function handleAutoPlayToggle() {
    videoSettings.autoPlayNextEpisode = !videoSettings.autoPlayNextEpisode;
    persistVideo();
  }

  function handleCountdownInput(e: Event) {
    const target = e.target as HTMLInputElement;
    videoSettings.autoPlayCountdownSeconds = parseInt(target.value, 10);
  }

  function handleCountdownChange(e: Event) {
    const target = e.target as HTMLInputElement;
    videoSettings.autoPlayCountdownSeconds = parseInt(target.value, 10);
    persistVideo();
  }

  function handleEpisodeLimitChange(value: number) {
    videoSettings.autoPlayMaxEpisodes = value;
    persistVideo();
  }

  /** TRACES: UR-074 | DR-162 */
  function handleStreamingQualityChange(quality: StreamingQuality) {
    videoSettings.streamingQuality = quality;
    persistVideo();
  }

  function handleSmartCachingToggle() {
    cacheConfig.albumAffinityEnabled = !cacheConfig.albumAffinityEnabled;
    persistCache();
  }

  function handleQueuePrecacheToggle() {
    cacheConfig.queuePrecacheEnabled = !cacheConfig.queuePrecacheEnabled;
    persistCache();
  }

  function handleWifiOnlyToggle() {
    cacheConfig.wifiOnly = !cacheConfig.wifiOnly;
    persistCache();
  }
</script>

<div class="max-w-2xl mx-auto space-y-8 p-6">
  <div>
    <h1 class="text-3xl font-bold text-white mb-2">Settings</h1>
    <p class="text-gray-400">Configure display, playback, and downloads</p>
  </div>

  {#if loading}
    <div class="text-center py-12 text-gray-400">
      <p>Loading settings...</p>
    </div>
  {:else}
    <div class="space-y-6">
      <!-- Display — grid/list preference, a second view onto the library
           viewMode store (same source of truth as the library page-header
           toggle, so the two stay in sync for free). -->
      <div id="display" class="scroll-mt-4 bg-[var(--color-surface)] rounded-lg p-6">
        <div class="mb-4">
          <h2 class="text-xl font-semibold text-white">Display</h2>
          <p class="text-sm text-gray-400 mt-1">
            How your library and collections are laid out
          </p>
        </div>
        <p class="text-sm font-medium text-gray-300 mb-3">Layout</p>
        <div class="grid grid-cols-2 gap-3">
          <button
            onclick={() => library.setViewMode("grid")}
            class="flex items-center justify-center gap-2 py-3 px-4 rounded-lg transition-all {$viewMode ===
            'grid'
              ? 'bg-[var(--color-jellyfin)] text-white'
              : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
            aria-pressed={$viewMode === "grid"}
          >
            <svg class="w-5 h-5" fill="currentColor" viewBox="0 0 24 24">
              <path d="M4 4h7v7H4V4zm9 0h7v7h-7V4zM4 13h7v7H4v-7zm9 0h7v7h-7v-7z" />
            </svg>
            <span class="font-semibold">Grid</span>
          </button>
          <button
            onclick={() => library.setViewMode("list")}
            class="flex items-center justify-center gap-2 py-3 px-4 rounded-lg transition-all {$viewMode ===
            'list'
              ? 'bg-[var(--color-jellyfin)] text-white'
              : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
            aria-pressed={$viewMode === "list"}
          >
            <svg class="w-5 h-5" fill="currentColor" viewBox="0 0 24 24">
              <path d="M3 5h18v2H3V5zm0 6h18v2H3v-2zm0 6h18v2H3v-2z" />
            </svg>
            <span class="font-semibold">List</span>
          </button>
        </div>
      </div>

      <!-- Crossfade -->
      <div class="bg-[var(--color-surface)] rounded-lg p-6">
        <div class="flex items-start justify-between mb-4">
          <div>
            <h2 class="text-xl font-semibold text-white">Crossfade</h2>
            <p class="text-sm text-gray-400 mt-1">
              Fade between tracks for seamless transitions
            </p>
          </div>
          <div class="text-right">
            <span class="text-2xl font-bold text-[var(--color-jellyfin)]">
              {settings.crossfadeDuration.toFixed(1)}s
            </span>
          </div>
        </div>
        <input
          type="range"
          min="0"
          max="12"
          step="0.5"
          value={settings.crossfadeDuration}
          oninput={handleCrossfadeInput}
          onchange={handleCrossfadeChange}
          class="w-full h-2 bg-gray-700 rounded-lg appearance-none cursor-pointer accent-[var(--color-jellyfin)]"
        />
        <div class="flex justify-between text-xs text-gray-500 mt-2">
          <span>0s (Off)</span>
          <span>12s (Max)</span>
        </div>
      </div>

      <!-- Gapless Playback -->
      <div class="bg-[var(--color-surface)] rounded-lg p-6">
        <div class="flex items-center justify-between">
          <div>
            <h2 class="text-xl font-semibold text-white">Gapless Playback</h2>
            <p class="text-sm text-gray-400 mt-1">
              Eliminate silence between tracks in albums
            </p>
          </div>
          <button
            onclick={handleGaplessToggle}
            class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors {settings.gaplessPlayback
              ? 'bg-[var(--color-jellyfin)]'
              : 'bg-gray-600'}"
            aria-label="Toggle gapless playback"
          >
            <span
              class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {settings.gaplessPlayback
                ? 'translate-x-7'
                : 'translate-x-1'}"
            ></span>
          </button>
        </div>
      </div>

      <!-- Volume Normalization -->
      <div class="bg-[var(--color-surface)] rounded-lg p-6 space-y-4">
        <div class="flex items-center justify-between">
          <div>
            <h2 class="text-xl font-semibold text-white">Volume Normalization</h2>
            <p class="text-sm text-gray-400 mt-1">
              Automatically adjust volume levels for consistent playback
            </p>
          </div>
          <button
            onclick={handleNormalizeToggle}
            class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors {settings.normalizeVolume
              ? 'bg-[var(--color-jellyfin)]'
              : 'bg-gray-600'}"
            aria-label="Toggle volume normalization"
          >
            <span
              class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {settings.normalizeVolume
                ? 'translate-x-7'
                : 'translate-x-1'}"
            ></span>
          </button>
        </div>

        {#if settings.normalizeVolume}
          <div class="pt-4 border-t border-gray-700">
            <p class="text-sm font-medium text-gray-300 mb-3">Target Volume Level</p>
            <div class="grid grid-cols-3 gap-3">
              <button
                onclick={() => handleVolumeLevelChange("loud")}
                class="py-3 px-4 rounded-lg transition-all {settings.volumeLevel ===
                'loud'
                  ? 'bg-[var(--color-jellyfin)] text-white'
                  : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
              >
                <div class="font-semibold">Loud</div>
                <div class="text-xs opacity-75">-11 LUFS</div>
              </button>
              <button
                onclick={() => handleVolumeLevelChange("normal")}
                class="py-3 px-4 rounded-lg transition-all {settings.volumeLevel ===
                'normal'
                  ? 'bg-[var(--color-jellyfin)] text-white'
                  : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
              >
                <div class="font-semibold">Normal</div>
                <div class="text-xs opacity-75">-14 LUFS</div>
              </button>
              <button
                onclick={() => handleVolumeLevelChange("quiet")}
                class="py-3 px-4 rounded-lg transition-all {settings.volumeLevel ===
                'quiet'
                  ? 'bg-[var(--color-jellyfin)] text-white'
                  : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
              >
                <div class="font-semibold">Quiet</div>
                <div class="text-xs opacity-75">-23 LUFS</div>
              </button>
            </div>
          </div>
        {/if}
      </div>

      <!-- Equalizer (UR-027) -->
      <div class="bg-[var(--color-surface)] rounded-lg p-6 space-y-4">
        <div class="flex items-center justify-between">
          <div>
            <h2 class="text-xl font-semibold text-white">Equalizer</h2>
            <p class="text-sm text-gray-400 mt-1">
              Shape the sound with presets or custom bands (Linux)
            </p>
          </div>
          <button
            onclick={handleEqToggle}
            class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors {settings.equalizerEnabled
              ? 'bg-[var(--color-jellyfin)]'
              : 'bg-gray-600'}"
            aria-label="Toggle equalizer"
          >
            <span
              class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {settings.equalizerEnabled
                ? 'translate-x-7'
                : 'translate-x-1'}"
            ></span>
          </button>
        </div>

        {#if settings.equalizerEnabled}
          <!-- Preset chips -->
          <div class="pt-4 border-t border-gray-700">
            <p class="text-sm font-medium text-gray-300 mb-3">Presets</p>
            <div class="flex flex-wrap gap-2">
              {#each eqPresets as [name, gains] (name)}
                <button
                  onclick={() => handleEqPreset(gains)}
                  class="px-3 py-1.5 rounded-full text-sm transition-all {activeEqPreset ===
                  name
                    ? 'bg-[var(--color-jellyfin)] text-white'
                    : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
                >
                  {EQ_PRESET_LABELS[name]}
                </button>
              {/each}
              {#if activeEqPreset === null}
                <span
                  class="px-3 py-1.5 rounded-full text-sm bg-[var(--color-jellyfin)] text-white"
                >
                  Custom
                </span>
              {/if}
            </div>
          </div>

          <!-- Band sliders -->
          <div class="pt-4 border-t border-gray-700">
            <p class="text-sm font-medium text-gray-300 mb-4">Bands (dB)</p>
            <div class="flex justify-between gap-1 sm:gap-2">
              {#each EQ_BAND_LABELS as label, i (label)}
                <div class="flex flex-col items-center gap-2 flex-1 min-w-0">
                  <span class="text-xs text-gray-400 tabular-nums">
                    {eqBands[i] > 0 ? "+" : ""}{eqBands[i]}
                  </span>
                  <input
                    type="range"
                    min={EQ_GAIN_MIN}
                    max={EQ_GAIN_MAX}
                    step="1"
                    value={eqBands[i]}
                    oninput={(e) => handleEqBandInput(i, e)}
                    onchange={(e) => handleEqBandChange(i, e)}
                    class="eq-slider"
                    aria-label="{label} Hz gain"
                  />
                  <span class="text-xs text-gray-500">{label}</span>
                </div>
              {/each}
            </div>
          </div>
        {/if}
      </div>

      <!-- Video Playback Settings -->
      <div class="border-t border-gray-700 pt-6">
        <h2 class="text-2xl font-bold text-white mb-4">Video Playback</h2>

        <!-- Auto-play Next Episode -->
        <div class="bg-[var(--color-surface)] rounded-lg p-6 space-y-4">
          <div class="flex items-center justify-between">
            <div>
              <h3 class="text-xl font-semibold text-white">Auto-play Next Episode</h3>
              <p class="text-sm text-gray-400 mt-1">
                Automatically start the next episode when one finishes
              </p>
            </div>
            <button
              onclick={handleAutoPlayToggle}
              class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors {videoSettings.autoPlayNextEpisode
                ? 'bg-[var(--color-jellyfin)]'
                : 'bg-gray-600'}"
              aria-label="Toggle auto-play next episode"
            >
              <span
                class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {videoSettings.autoPlayNextEpisode
                  ? 'translate-x-7'
                  : 'translate-x-1'}"
              ></span>
            </button>
          </div>

          {#if videoSettings.autoPlayNextEpisode}
            <div class="pt-4 border-t border-gray-700">
              <div class="flex items-start justify-between mb-4">
                <div>
                  <p class="text-sm font-medium text-gray-300">Countdown Duration</p>
                  <p class="text-xs text-gray-500 mt-1">
                    Time before next episode starts automatically
                  </p>
                </div>
                <div class="text-right">
                  <span class="text-2xl font-bold text-[var(--color-jellyfin)]">
                    {videoSettings.autoPlayCountdownSeconds}s
                  </span>
                </div>
              </div>
              <input
                type="range"
                min="5"
                max="30"
                step="5"
                value={videoSettings.autoPlayCountdownSeconds}
                oninput={handleCountdownInput}
                onchange={handleCountdownChange}
                class="w-full h-2 bg-gray-700 rounded-lg appearance-none cursor-pointer accent-[var(--color-jellyfin)]"
              />
              <div class="flex justify-between text-xs text-gray-500 mt-2">
                <span>5s</span>
                <span>30s</span>
              </div>
            </div>

            <!-- Episode Limit -->
            <div class="pt-4 border-t border-gray-700">
              <div class="mb-4">
                <p class="text-sm font-medium text-gray-300">Episode Limit</p>
                <p class="text-xs text-gray-500 mt-1">
                  Stop auto-playing after this many consecutive episodes
                </p>
              </div>
              <div class="grid grid-cols-3 md:grid-cols-6 gap-2">
                {#each episodeLimitOptions as option}
                  <button
                    onclick={() => handleEpisodeLimitChange(option.value)}
                    class="py-3 px-3 rounded-lg transition-all text-sm
                      {videoSettings.autoPlayMaxEpisodes === option.value
                        ? 'bg-[var(--color-jellyfin)] text-white'
                        : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
                  >
                    <div class="font-semibold">{option.label}</div>
                  </button>
                {/each}
              </div>
            </div>
          {/if}
        </div>

        <!-- Streaming quality: the bandwidth ceiling every video stream is
             opened against. The steps and their labels come from Rust.
             TRACES: UR-074 | DR-162 -->
        <div class="bg-[var(--color-surface)] rounded-lg p-6 mt-4">
          <h3 class="text-xl font-semibold text-white">Streaming Quality</h3>
          <p class="text-sm text-gray-400 mt-1 mb-4">
            Limit how much bandwidth video streams may use. Lower settings ask the
            server to transcode before sending, which saves data on metered or slow
            connections at the cost of picture quality. You can also change this for
            a single video from the player's quality menu.
          </p>
          <div class="grid grid-cols-2 md:grid-cols-4 gap-2">
            {#each streamingQualities as [quality, label, detail]}
              <button
                onclick={() => handleStreamingQualityChange(quality)}
                class="py-3 px-3 rounded-lg transition-all text-left
                  {videoSettings.streamingQuality === quality
                    ? 'bg-[var(--color-jellyfin)] text-white'
                    : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
                aria-pressed={videoSettings.streamingQuality === quality}
              >
                <div class="font-semibold text-sm">{label}</div>
                <div class="text-xs opacity-75 mt-0.5">{detail}</div>
              </button>
            {/each}
          </div>
          <p class="text-xs text-gray-500 mt-3">
            Applies to videos started from now on; a video already playing keeps the
            quality it started at.
          </p>
        </div>

        <!-- Native video (experimental). Only rendered where the platform's Rust
             backend actually has a native video surface (Android). -->
        {#if supportsNativeVideo}
          <div class="bg-[var(--color-surface)] rounded-lg p-6 mt-4">
            <div class="flex items-center justify-between">
              <div class="pr-4">
                <h3 class="text-xl font-semibold text-white">
                  Native Video
                  <span
                    class="ml-2 align-middle text-xs font-medium uppercase tracking-wide text-amber-400 border border-amber-400/40 rounded px-1.5 py-0.5"
                  >
                    Experimental
                  </span>
                </h3>
                <p class="text-sm text-gray-400 mt-1">
                  Decode video with the device's hardware decoder instead of the
                  built-in web player. Better performance and battery life, and
                  required for picture-in-picture to show the video rather than
                  the app. Still less tested — turn this off if video fails to
                  appear or seeking misbehaves.
                </p>
              </div>
              <button
                onclick={handleNativeVideoToggle}
                class="relative inline-flex h-8 w-14 shrink-0 items-center rounded-full transition-colors {nativeVideoEnabled
                  ? 'bg-[var(--color-jellyfin)]'
                  : 'bg-gray-600'}"
                aria-label="Toggle native video"
              >
                <span
                  class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {nativeVideoEnabled
                    ? 'translate-x-7'
                    : 'translate-x-1'}"
                ></span>
              </button>
            </div>
            <p class="text-xs text-gray-500 mt-3">
              Takes effect the next time you start a video.
            </p>
          </div>
        {/if}
      </div>

      <!-- Search Settings -->
      <div class="border-t border-gray-700 pt-6">
        <h2 class="text-2xl font-bold text-white mb-4">Search</h2>

        <div class="bg-[var(--color-surface)] rounded-lg p-6">
          <h3 class="text-lg font-semibold text-white mb-1">Result Group Order</h3>
          <p class="text-sm text-gray-400 mb-4">
            Drag or use the arrows to choose the order search result groups appear in.
            Empty groups are hidden automatically.
          </p>
          <SearchGroupOrderList />
        </div>
      </div>

      <!-- Pending server updates. Lives here as well as behind the offline
           banner's badge, because a row that keeps failing is still queued once
           the server is reachable again — when no banner is on screen.
           TRACES: UR-025 | DR-132 -->
      <div class="border-t border-gray-700 pt-6">
        <h2 class="text-2xl font-bold text-white mb-4">Waiting to sync</h2>

        <div class="bg-[var(--color-surface)] rounded-lg p-6">
          <PendingSyncList />
        </div>
      </div>

      <!-- Image Cache Settings -->
      <div class="border-t border-gray-700 pt-6">
        <h2 class="text-2xl font-bold text-white mb-4">Image Cache</h2>

        <div class="bg-[var(--color-surface)] rounded-lg p-6 space-y-6">
          <!-- Cache Usage -->
          <div>
            <div class="flex items-center justify-between mb-2">
              <h3 class="text-lg font-semibold text-white">Cache Usage</h3>
              {#if cacheLoading}
                <span class="text-sm text-gray-400">Loading...</span>
              {:else if cacheStats}
                <span class="text-sm text-gray-300">
                  {formatBytes(cacheStats.totalSizeBytes)} / {cacheStats.limitBytes === 0 ? "Unlimited" : formatBytes(cacheStats.limitBytes)}
                </span>
              {/if}
            </div>

            {#if cacheStats && cacheStats.limitBytes > 0}
              <!-- Progress bar -->
              <div class="w-full bg-gray-700 rounded-full h-3 mb-2">
                <div
                  class="h-3 rounded-full transition-all duration-300 {getCacheUsagePercent() > 90 ? 'bg-red-500' : getCacheUsagePercent() > 70 ? 'bg-yellow-500' : 'bg-[var(--color-jellyfin)]'}"
                  style="width: {getCacheUsagePercent()}%"
                ></div>
              </div>
            {/if}

            <p class="text-sm text-gray-400">
              {#if cacheStats}
                {cacheStats.itemCount} images cached
              {:else}
                Thumbnails and artwork are cached locally for faster loading
              {/if}
            </p>
          </div>

          <!-- Cache Limit -->
          <div class="pt-4 border-t border-gray-700">
            <h3 class="text-lg font-semibold text-white mb-3">Storage Limit</h3>
            <div class="grid grid-cols-2 md:grid-cols-5 gap-2">
              {#each cacheLimitOptions as option}
                <button
                  onclick={() => handleCacheLimitChange(option.bytes)}
                  class="py-2 px-3 rounded-lg transition-all text-sm {isCurrentLimit(option.bytes)
                    ? 'bg-[var(--color-jellyfin)] text-white'
                    : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
                >
                  <div class="font-semibold">{option.label}</div>
                  {#if option.default}
                    <div class="text-xs opacity-75">Default</div>
                  {/if}
                </button>
              {/each}
            </div>
          </div>

          <!-- Clear Cache -->
          <div class="pt-4 border-t border-gray-700">
            <div class="flex items-center justify-between">
              <div>
                <h3 class="text-lg font-semibold text-white">Clear Image Cache</h3>
                <p class="text-sm text-gray-400">Remove all cached thumbnails and artwork</p>
              </div>
              <button
                onclick={handleClearCache}
                disabled={clearingCache || (cacheStats?.itemCount ?? 0) === 0}
                class="px-4 py-2 bg-red-600 text-white rounded-lg font-medium hover:bg-red-700 transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
              >
                {clearingCache ? "Clearing..." : "Clear Cache"}
              </button>
            </div>
          </div>
        </div>
      </div>

      <!-- Download Settings -->
      <div class="border-t border-gray-700 pt-6">
        <h2 class="text-2xl font-bold text-white mb-4">Downloads</h2>

        <!-- Storage Limit -->
        <div class="bg-[var(--color-surface)] rounded-lg p-6 mb-4">
          <div class="mb-4">
            <h3 class="text-xl font-semibold text-white">Storage Limit</h3>
            <p class="text-sm text-gray-400 mt-1">
              Maximum storage for offline downloads
            </p>
          </div>
          <div class="grid grid-cols-2 md:grid-cols-4 gap-3">
            <button
              class="py-3 px-4 rounded-lg transition-all bg-gray-700 text-gray-300 hover:bg-gray-600"
            >
              <div class="font-semibold">5 GB</div>
            </button>
            <button
              class="py-3 px-4 rounded-lg transition-all bg-[var(--color-jellyfin)] text-white"
            >
              <div class="font-semibold">10 GB</div>
              <div class="text-xs opacity-75">Default</div>
            </button>
            <button
              class="py-3 px-4 rounded-lg transition-all bg-gray-700 text-gray-300 hover:bg-gray-600"
            >
              <div class="font-semibold">20 GB</div>
            </button>
            <button
              class="py-3 px-4 rounded-lg transition-all bg-gray-700 text-gray-300 hover:bg-gray-600"
            >
              <div class="font-semibold">Unlimited</div>
            </button>
          </div>
        </div>

        <!-- Smart Caching -->
        <div class="bg-[var(--color-surface)] rounded-lg p-6 mb-4">
          <div class="flex items-center justify-between">
            <div>
              <h3 class="text-xl font-semibold text-white">Smart Caching</h3>
              <p class="text-sm text-gray-400 mt-1">
                Automatically download albums you're listening to
              </p>
            </div>
            <button
              onclick={handleSmartCachingToggle}
              class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors {cacheConfig.albumAffinityEnabled
                ? 'bg-[var(--color-jellyfin)]'
                : 'bg-gray-600'}"
              aria-label="Toggle smart caching"
              aria-pressed={cacheConfig.albumAffinityEnabled}
            >
              <span
                class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {cacheConfig.albumAffinityEnabled
                  ? 'translate-x-7'
                  : 'translate-x-1'}"
              ></span>
            </button>
          </div>
        </div>

        <!-- Queue Pre-caching -->
        <div class="bg-[var(--color-surface)] rounded-lg p-6 mb-4">
          <div class="flex items-center justify-between">
            <div>
              <h3 class="text-xl font-semibold text-white">Queue Pre-caching</h3>
              <p class="text-sm text-gray-400 mt-1">
                Download the next {cacheConfig.queuePrecacheCount} tracks in the queue
                automatically
              </p>
            </div>
            <button
              onclick={handleQueuePrecacheToggle}
              class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors {cacheConfig.queuePrecacheEnabled
                ? 'bg-[var(--color-jellyfin)]'
                : 'bg-gray-600'}"
              aria-label="Toggle queue pre-caching"
              aria-pressed={cacheConfig.queuePrecacheEnabled}
            >
              <span
                class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {cacheConfig.queuePrecacheEnabled
                  ? 'translate-x-7'
                  : 'translate-x-1'}"
              ></span>
            </button>
          </div>
        </div>

        <!-- WiFi Only -->
        <div class="bg-[var(--color-surface)] rounded-lg p-6">
          <div class="flex items-center justify-between">
            <div>
              <h3 class="text-xl font-semibold text-white">WiFi Only</h3>
              <p class="text-sm text-gray-400 mt-1">
                {#if networkDetectionSupported}
                  Hold downloads unless on an unmetered network. Cellular and
                  metered hotspots are excluded; WiFi and Ethernet are allowed.
                {:else}
                  Only available on Android — this device has no metered
                  connection to detect.
                {/if}
              </p>
            </div>
            <button
              onclick={handleWifiOnlyToggle}
              class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors {cacheConfig.wifiOnly
                ? 'bg-[var(--color-jellyfin)]'
                : 'bg-gray-600'} {networkDetectionSupported
                ? ''
                : 'opacity-50 cursor-not-allowed'}"
              aria-label="Toggle WiFi only downloads"
              aria-pressed={cacheConfig.wifiOnly}
              disabled={!networkDetectionSupported}
            >
              <span
                class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {cacheConfig.wifiOnly
                  ? 'translate-x-7'
                  : 'translate-x-1'}"
              ></span>
            </button>
          </div>
        </div>
      </div>

      <!-- Info Box -->
      <div class="bg-blue-900/20 border border-blue-800 rounded-lg p-4">
        <div class="flex gap-3">
          <svg
            class="w-5 h-5 text-blue-400 flex-shrink-0 mt-0.5"
            fill="currentColor"
            viewBox="0 0 20 20"
          >
            <path
              fill-rule="evenodd"
              d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7-4a1 1 0 11-2 0 1 1 0 012 0zM9 9a1 1 0 000 2v3a1 1 0 001 1h1a1 1 0 100-2v-3a1 1 0 00-1-1H9z"
              clip-rule="evenodd"
            />
          </svg>
          <div class="text-sm text-blue-300">
            <p class="font-semibold mb-1">About these settings:</p>
            <ul class="list-disc list-inside space-y-1 text-blue-200">
              <li>
                <strong>Crossfade</strong> smoothly blends the end of one track with the
                beginning of the next
              </li>
              <li>
                <strong>Gapless</strong> removes silence between tracks for continuous
                album playback
              </li>
              <li>
                <strong>Normalization</strong> evens out loudness between tracks
                in real time, toward your selected level
              </li>
            </ul>
          </div>
        </div>
      </div>
    </div>
  {/if}
</div>

<style>
  /* Vertical EQ band sliders. `appearance: slider-vertical` is deprecated;
     use writing-mode which is the supported path in modern WebKit/Chromium. */
  .eq-slider {
    writing-mode: vertical-lr;
    direction: rtl;
    width: 8px;
    height: 96px;
    accent-color: var(--color-jellyfin);
    cursor: pointer;
  }
</style>
