/* ======================================================
   MusicTools — Frontend (vanilla JS)
   ====================================================== */

const $ = (sel) => document.querySelector(sel);
const $$ = (sel) => Array.from(document.querySelectorAll(sel));

const state = {
  config: {},
  license: { licensed: false },
  purchaseUrl: "https://musictools.djluza.com",
  loaded: null,  // { kind: "urls"|"tracks", urls?, tracks?, count }
  dlOutputDir: "",
  upDir: "",
  videoOutputDir: "",
  showSecret: false,
  downloading: false,
  upgrading: false,
  videoDownloading: false,
  meta: { path: "", newCoverPath: "", removeCover: false },
  rec: { devices: [], outputDir: "", recording: false, seconds: 0 },
};

// Wait for pywebview ready
function waitApi() {
  return new Promise((resolve) => {
    if (window.pywebview && window.pywebview.api) return resolve();
    window.addEventListener("pywebviewready", resolve, { once: true });
  });
}

// Riconosce se una stringa e un URL (incluso schema spotify:)
function looksLikeUrl(s) {
  if (!s) return false;
  if (/^(https?|spotify):/i.test(s)) return true;
  if (s.includes("://")) return true;
  // Domini comuni anche senza http (es. "youtube.com/...")
  return /^(www\.)?(youtube\.com|youtu\.be|spotify\.com|soundcloud\.com|tiktok\.com|instagram\.com|facebook\.com|fb\.watch)\//i.test(s);
}

// Trasforma una query libera in {name, artist}.
// Formati riconosciuti: "Artista - Titolo" (anche con – o —) oppure solo "Titolo".
function parseQueryToTrack(q) {
  const s = (q || "").trim();
  const m = s.match(/^(.+?)\s+[-–—]\s+(.+)$/);
  if (m) return { artist: m[1].trim(), name: m[2].trim() };
  return { artist: "", name: s };
}

// ============================================================
// Licenza: gating della UI principale
// ============================================================
function applyLicenseGate() {
  const lic = state.license || { licensed: false };
  const screen = $("#activateScreen");
  const appEl = document.querySelector(".app");
  if (!lic.licensed) {
    if (screen) screen.hidden = false;
    if (appEl) appEl.style.display = "none";
  } else {
    if (screen) screen.hidden = true;
    if (appEl) appEl.style.display = "";
  }
}

function fmtDate(epoch) {
  if (!epoch) return "—";
  try {
    return new Date(epoch * 1000).toLocaleDateString("it-IT", {
      day: "2-digit", month: "short", year: "numeric"
    });
  } catch (_e) { return "—"; }
}

function renderLicenseStatus() {
  const lic = state.license || {};
  const box = $("#licenseStatusBox");
  if (!box) return;  // panel non ancora montato
  if (!lic.licensed) {
    box.innerHTML = `<div class="lic-warn">Licenza non attiva</div>`;
    return;
  }
  const plan = lic.plan || {};
  const planLine = plan.code
    ? `<div class="lic-row"><span>Piano</span><strong>${plan.name || plan.code}</strong></div>`
    : "";
  const limitLine = plan.daily_limit
    ? `<div class="lic-row"><span>Limite giornaliero</span><strong>${plan.daily_limit}</strong></div>`
    : (plan.code === "annual"
        ? `<div class="lic-row"><span>Limite giornaliero</span><strong>Illimitato</strong></div>`
        : "");
  const expiryLine = plan.expires_at
    ? `<div class="lic-row"><span>Scade il</span><strong>${fmtDate(plan.expires_at)}</strong></div>`
    : (plan.period_end
        ? `<div class="lic-row"><span>Prossimo rinnovo</span><strong>${fmtDate(plan.period_end)}</strong></div>`
        : "");
  box.innerHTML = `
    ${planLine}
    ${limitLine}
    ${expiryLine}
    <div class="lic-row"><span>Email</span><strong>${lic.email || "—"}</strong></div>
    <div class="lic-row"><span>Chiave</span><strong>${lic.key || "—"}</strong></div>
    <div class="lic-row"><span>Attivata il</span><strong>${fmtDate(lic.activated_at)}</strong></div>
    <div class="lic-row"><span>Ultima verifica</span><strong>${fmtDate(lic.last_validated_at)}</strong></div>
  `;
}

// ============================================================
// Piano e quota giornaliera
// ============================================================
function applyPlanGate() {
  // Nasconde le tab non incluse nel piano corrente.
  const lic = state.license || {};
  const features = (lic.plan && lic.plan.features) || [];
  $$(".nav-item[data-feature]").forEach((btn) => {
    const f = btn.dataset.feature;
    const allowed = features.includes(f);
    btn.hidden = !allowed;
    if (!allowed && btn.classList.contains("active")) {
      // Fallback alla prima tab disponibile (audio o settings)
      const fallback = $$(".nav-item[data-feature]:not([hidden])")[0]
        || $(".nav-item[data-view='settings']");
      if (fallback) showView(fallback.dataset.view);
    }
  });
}

function renderQuotaBox(q) {
  const box = $("#quotaBox");
  if (!box) return;
  const lic = state.license || {};
  const plan = (q && q.plan) || lic.plan || {};
  if (!plan.code || plan.code === "annual" || plan.daily_limit == null) {
    // Annual / unlimited -> niente contatore
    box.hidden = true;
    return;
  }
  box.hidden = false;
  $("#quotaUsed").textContent = String((q && q.used) ?? 0);
  $("#quotaLimit").textContent = String(plan.daily_limit);
  $("#quotaPlanName").textContent = plan.name || plan.code;
  const upBtn = $("#quotaUpgradeBtn");
  if (upBtn) upBtn.hidden = plan.code === "premium";
}

async function refreshQuota() {
  const lic = state.license || {};
  const plan = lic.plan || {};
  if (!lic.licensed || !plan.code || plan.daily_limit == null) {
    renderQuotaBox(null);
    return;
  }
  try {
    const res = await window.pywebview.api.get_quota_status();
    if (res && res.ok) {
      renderQuotaBox(res.quota);
    }
  } catch (_e) { /* offline: lascia stato precedente */ }
}

function showUpgradeModal(reason, payload) {
  const modal = $("#upgradeModal");
  if (!modal) return;
  const title = $("#upgradeModalTitle");
  const body = $("#upgradeModalBody");
  if (reason === "feature_not_in_plan") {
    title.textContent = "Funzione non inclusa nel piano";
    body.innerHTML = `
      <p>${payload.error || "Questa funzione non e' inclusa nel tuo piano."}</p>
      <p class="modal-hint">Passa a un piano superiore per sbloccarla.</p>
    `;
  } else if (reason === "quota_exceeded") {
    const q = payload.quota || {};
    title.textContent = "Limite giornaliero raggiunto";
    body.innerHTML = `
      <p>${payload.error || "Hai raggiunto il limite giornaliero del tuo piano."}</p>
      <p class="modal-hint">Usati oggi: <strong>${q.used ?? "?"} / ${q.limit ?? "?"}</strong>. Il contatore si resetta a mezzanotte (ora di Roma).</p>
    `;
  } else if (reason === "license_invalid") {
    title.textContent = "Licenza non valida";
    body.innerHTML = `<p>${payload.error || "La tua licenza non e' piu' valida."}</p>`;
  } else if (reason === "offline") {
    title.textContent = "Connessione assente";
    body.innerHTML = `<p>${payload.error || "Impossibile contattare il server."}</p>`;
  } else {
    title.textContent = "Operazione bloccata";
    body.innerHTML = `<p>${payload.error || "L'operazione non e' stata avviata."}</p>`;
  }
  modal.hidden = false;
}

function hideUpgradeModal() {
  const modal = $("#upgradeModal");
  if (modal) modal.hidden = true;
}

/** Gestisce il dict di errore restituito dai metodi start_*: se e' un
 *  gate failure (feature/quota/license/offline), mostra il modal e
 *  ritorna true (= caller deve interrompere il flow). */
function handleGateBlock(res) {
  if (!res || res.ok !== false) return false;
  const r = res.reason;
  if (r === "feature_not_in_plan" || r === "quota_exceeded"
      || r === "license_invalid" || r === "offline") {
    showUpgradeModal(r, res);
    return true;
  }
  return false;
}

async function activateLicense() {
  const email = $("#actEmail").value.trim();
  const key = $("#actKey").value.trim();
  const err = $("#actError");
  err.hidden = true;
  err.textContent = "";
  if (!email || !key) {
    err.textContent = "Inserisci email e chiave di licenza.";
    err.hidden = false;
    return;
  }
  const btn = $("#actActivateBtn");
  btn.disabled = true;
  const oldText = btn.innerHTML;
  btn.innerHTML = "Attivazione in corso…";
  try {
    const res = await window.pywebview.api.activate_license({ email, key });
    if (res.ok) {
      state.license = res.license;
      applyLicenseGate();
      renderLicenseStatus();
      applyPlanGate();
      refreshQuota();
      toast("Licenza attivata. Benvenuto!", "success");
    } else {
      err.textContent = res.error || "Errore di attivazione.";
      err.hidden = false;
    }
  } finally {
    btn.disabled = false;
    btn.innerHTML = oldText;
  }
}

async function deactivateLicense() {
  if (!confirm("Disattivare la licenza su questo dispositivo?")) return;
  const res = await window.pywebview.api.deactivate_license();
  if (res.ok) {
    state.license = res.license;
    applyLicenseGate();
    renderLicenseStatus();
    toast("Licenza disattivata", "info");
  }
}

// ============================================================
// Bridge — eventi spinti dal backend
// ============================================================
window.bridge = {
  emit(channel, payload) {
    const handler = bridgeHandlers[channel];
    if (handler) handler(payload);
  },
};

const bridgeHandlers = {
  "log": ({ view, msg }) => appendLog(view, msg),
  "quota:update": (q) => renderQuotaBox(q),

  "download:progress": (p) => {
    if (typeof p.overall === "number") {
      const pct = Math.round(p.overall * 100);
      $("#dlProgressFill").style.width = pct + "%";
      $("#dlPercent").textContent = pct + "%";
    }
    if (p.status === "searching" && typeof p.idx === "number") {
      const prefix = p.url_total > 1 ? `[${(p.url_idx ?? 0) + 1}/${p.url_total}] ` : "";
      $("#dlCounter").textContent = `${prefix}Brano ${p.idx + 1} di ${p.total}`;
    }
    if (p.status === "completed" && p.url_total > 1) {
      $("#dlCounter").textContent = `Completato: ${p.url_total} URL`;
    }
  },

  "download:done": () => {
    state.downloading = false;
    state.loaded = null;
    $("#urlListBadge").hidden = true;
    $("#urlListBadge").textContent = "";
    $("#downloadBtn").disabled = false;
    $("#loadListBtn").disabled = false;
    $("#stopDownloadBtn").disabled = true;
  },

  "upgrade:progress": (p) => {
    if (typeof p.overall === "number") {
      const pct = Math.round(p.overall * 100);
      $("#upProgressFill").style.width = pct + "%";
      $("#upPercent").textContent = pct + "%";
    }
    if (typeof p.idx === "number" && typeof p.total === "number" && p.total > 0) {
      $("#upCounter").textContent = `File ${p.idx} di ${p.total}`;
    }
    if (p.status === "completed") {
      $("#upCounter").textContent = `Completato: ${p.total} file`;
    }
  },

  "upgrade:done": () => {
    state.upgrading = false;
    $("#upgradeBtn").disabled = false;
    $("#stopUpgradeBtn").disabled = true;
  },

  "video:progress": (p) => {
    if (typeof p.overall === "number") {
      const pct = Math.round(p.overall * 100);
      $("#videoProgressFill").style.width = pct + "%";
      $("#videoPercent").textContent = pct + "%";
    }
    if (p.status === "downloading" && typeof p.idx === "number") {
      const prefix = p.url_total > 1 ? `[${(p.url_idx ?? 0) + 1}/${p.url_total}] ` : "";
      $("#videoCounter").textContent = `${prefix}Video ${p.idx + 1} di ${p.total}`;
    }
    if (p.status === "completed" && p.url_total > 1) {
      $("#videoCounter").textContent = `Completato: ${p.url_total} URL`;
    }
  },

  "video:done": () => {
    state.videoDownloading = false;
    $("#videoDownloadBtn").disabled = false;
    $("#stopVideoBtn").disabled = true;
  },

  "recording:event": (p) => {
    const status = p.status;
    if (status === "started") {
      state.rec.recording = true;
      state.rec.seconds = 0;
      $("#recStartBtn").disabled = true;
      $("#recStartBtn").classList.add("recording");
      $("#recStopBtn").disabled = false;
      $("#recDevice").disabled = true;
      $("#recRefreshBtn").disabled = true;
      $("#recTimer").textContent = "00:00:00";
      $("#recStatus").textContent = "● Registrazione in corso…";
      $("#recErrorCard").hidden = true;  // pulisci eventuale errore precedente
    } else if (status === "tick") {
      state.rec.seconds = p.seconds || 0;
      $("#recTimer").textContent = formatHms(state.rec.seconds);
    } else if (status === "stopped") {
      state.rec.recording = false;
      $("#recStartBtn").disabled = false;
      $("#recStartBtn").classList.remove("recording");
      $("#recStopBtn").disabled = true;
      $("#recDevice").disabled = false;
      $("#recRefreshBtn").disabled = false;
      $("#recStatus").textContent = "";
      $("#recOutputCard").hidden = false;
      $("#recResult").innerHTML = `
        <span class="badge-dur">${formatHms(p.seconds || 0)}</span>
        ${p.output_path || ""}
      `;
      toast("Registrazione salvata", "success");
    } else if (status === "error") {
      state.rec.recording = false;
      $("#recStartBtn").disabled = false;
      $("#recStartBtn").classList.remove("recording");
      $("#recStopBtn").disabled = true;
      $("#recDevice").disabled = false;
      $("#recRefreshBtn").disabled = false;
      $("#recStatus").textContent = "";
      const msg = p.error || "Errore sconosciuto";
      $("#recErrorMsg").textContent = msg;
      $("#recErrorCard").hidden = false;
      $("#recErrorLog").hidden = true;
      $("#recErrorLog").textContent = "";
      $("#recCopyLogBtn").hidden = true;
      $("#recShowLogBtn").textContent = "Mostra log tecnici";
      toast("Errore registrazione", "error");
    }
  },
};

function formatHms(sec) {
  const h = Math.floor(sec / 3600).toString().padStart(2, "0");
  const m = Math.floor((sec % 3600) / 60).toString().padStart(2, "0");
  const s = Math.floor(sec % 60).toString().padStart(2, "0");
  return `${h}:${m}:${s}`;
}

// ============================================================
// Logging
// ============================================================
const logEls = {
  download: () => $("#dlLog"),
  upgrade: () => $("#upLog"),
  video: () => $("#videoLog"),
  spotify: () => $("#spotify-log"),
  youtube: () => $("#youtube-log"),
};

function classifyLog(msg) {
  if (msg.startsWith("[ERRORE]")) return "l-err";
  if (msg.startsWith("[OK]") || msg.startsWith("[UPGRADE]")) return "l-ok";
  if (msg.startsWith("[INFO]")) return "l-info";
  if (msg.startsWith("[SKIP]") || msg.startsWith("[CERCA]") || msg.startsWith("[DOWNLOAD]") || msg.startsWith("[CONV]")) return "l-muted";
  if (msg.startsWith("[NON TROVATO]")) return "l-warn";
  if (msg.startsWith("[LISTA]")) return "l-info";
  return "";
}

function appendLog(view, msg) {
  const el = logEls[view] && logEls[view]();
  if (!el) return;
  const cls = classifyLog(msg);
  const line = document.createElement("div");
  if (cls) line.className = cls;
  line.textContent = msg;
  el.appendChild(line);
  el.scrollTop = el.scrollHeight;
}

// ============================================================
// Toast
// ============================================================
let toastTimer = null;
function toast(msg, kind = "") {
  const el = $("#toast");
  el.textContent = msg;
  el.className = "toast show " + (kind ? `toast-${kind}` : "");
  clearTimeout(toastTimer);
  toastTimer = setTimeout(() => { el.className = "toast"; }, 3000);
}

// ============================================================
// Routing (sidebar)
// ============================================================
function showView(name) {
  $$(".view").forEach((v) => v.classList.toggle("active", v.id === `view-${name}`));
  $$(".nav-item").forEach((b) => b.classList.toggle("active", b.dataset.view === name));
}

function applyTheme(theme) {
  const t = theme === "light" ? "light" : "dark";
  document.documentElement.dataset.theme = t;
}

$$(".nav-item").forEach((btn) => {
  btn.addEventListener("click", () => showView(btn.dataset.view));
});

// ============================================================
// Init
// ============================================================
async function init() {
  await waitApi();
  const data = await window.pywebview.api.get_init_data();
  state.config = data.config || {};
  state.license = data.license || { licensed: false };
  state.purchaseUrl = data.purchase_url || "https://musictools.djluza.com";
  $("#footerVersion").textContent = data.version;
  $("#currentVersionLabel").textContent = data.version;
  $("#guideBody").textContent = data.spotify_guide;

  applyLicenseGate();
  renderLicenseStatus();
  applyPlanGate();
  refreshQuota();

  // Populate Settings fields
  $("#clientIdInput").value = state.config.client_id || "";
  $("#clientSecretInput").value = state.config.client_secret || "";
  $("#bitrateSelect").value = state.config.bitrate || "320K";
  $("#hqThresholdInput").value = state.config.hq_threshold || 310;
  $("#cookiesInput").value = state.config.cookies_path || "";
  $("#outputInput").value = state.config.output_dir || "";
  $("#themeSelect").value = state.config.theme || "dark";
  applyTheme(state.config.theme);

  // Download tab — usa output_dir come default
  state.dlOutputDir = state.config.output_dir || "";
  if (state.dlOutputDir) {
    $("#dlPathDisplay").textContent = state.dlOutputDir;
    $("#dlPathDisplay").classList.remove("empty");
  }

  // Video tab — usa output_dir come default
  state.videoOutputDir = state.config.output_dir || "";
  if (state.videoOutputDir) {
    $("#videoPathDisplay").textContent = state.videoOutputDir;
    $("#videoPathDisplay").classList.remove("empty");
  }

  // Upgrade tab — default threshold
  $("#upThreshold").value = state.config.hq_threshold || 310;

  // Record tab — default output dir + carica dispositivi
  state.rec.outputDir = state.config.output_dir || "";
  if (state.rec.outputDir) {
    $("#recPathDisplay").textContent = state.rec.outputDir;
    $("#recPathDisplay").classList.remove("empty");
  }
  await refreshRecDevices();

  // Beatport tab — popola generi, ripristina ultimo genere, aggancia handler
  await BeatportUI.init();

  // Spotify + YouTube search tabs
  await SpotifyUI.init();
  await YoutubeUI.init();
}

async function refreshRecDevices() {
  const res = await window.pywebview.api.list_audio_inputs();
  const select = $("#recDevice");
  select.innerHTML = "";
  state.rec.devices = res.devices || [];
  if (!state.rec.devices.length) {
    const opt = document.createElement("option");
    opt.value = "";
    opt.textContent = "Nessun dispositivo trovato";
    select.appendChild(opt);
    return;
  }
  for (const d of state.rec.devices) {
    const opt = document.createElement("option");
    opt.value = d.id;
    opt.textContent = d.is_virtual ? `🔄 ${d.name} (loopback)` : d.name;
    select.appendChild(opt);
  }
}

// ============================================================
// DOWNLOAD tab
// ============================================================
$("#dlBrowseBtn").addEventListener("click", async () => {
  const path = await window.pywebview.api.browse_directory();
  if (path) {
    state.dlOutputDir = path;
    $("#dlPathDisplay").textContent = path;
    $("#dlPathDisplay").classList.remove("empty");
  }
});

$("#loadListBtn").addEventListener("click", async () => {
  const path = await window.pywebview.api.browse_file([
    "Text files (*.txt)",
    "All files (*.*)",
  ]);
  if (!path) return;
  const res = await window.pywebview.api.load_url_list(path);
  if (!res.ok) {
    toast("Impossibile leggere il file: " + (res.error || ""), "error");
    return;
  }
  if (!res.count) {
    toast("Il file non contiene voci valide", "error");
    return;
  }
  state.loaded = res;
  $("#urlInput").value = path;
  const badge = $("#urlListBadge");
  if (res.kind === "tracks") {
    badge.textContent = `· ${res.count} tracce`;
    appendLog("download", `[INFO] Caricata tracklist: ${res.count} brani`);
  } else {
    badge.textContent = `· ${res.count} URL`;
    appendLog("download", `[INFO] Caricati ${res.count} URL dal file`);
  }
  badge.hidden = false;
});

$("#downloadBtn").addEventListener("click", async () => {
  if (!state.dlOutputDir) {
    toast("Seleziona una cartella di destinazione", "error");
    return;
  }

  state.downloading = true;
  $("#downloadBtn").disabled = true;
  $("#loadListBtn").disabled = true;
  $("#stopDownloadBtn").disabled = false;
  $("#dlProgressFill").style.width = "0%";
  $("#dlPercent").textContent = "0%";

  let res;
  if (state.loaded && state.loaded.kind === "tracks") {
    res = await window.pywebview.api.start_tracks_download({
      tracks: state.loaded.tracks,
      output_dir: state.dlOutputDir,
      subfolder: state.loaded.name || "",
    });
  } else {
    let urls = state.loaded && state.loaded.kind === "urls" ? state.loaded.urls : [];
    if (!urls.length) {
      const single = $("#urlInput").value.trim();
      if (!single) {
        toast("Inserisci un URL, un titolo o carica una lista", "error");
        bridgeHandlers["download:done"]();
        return;
      }
      if (looksLikeUrl(single)) {
        urls = [single];
      } else {
        const track = parseQueryToTrack(single);
        res = await window.pywebview.api.start_tracks_download({
          tracks: [track],
          output_dir: state.dlOutputDir,
          subfolder: "",
        });
        if (!res.ok) {
          if (!handleGateBlock(res)) toast(res.error || "Errore", "error");
          bridgeHandlers["download:done"]();
        }
        return;
      }
    }
    res = await window.pywebview.api.start_download({
      urls,
      output_dir: state.dlOutputDir,
    });
  }

  if (!res.ok) {
    if (!handleGateBlock(res)) toast(res.error || "Errore", "error");
    bridgeHandlers["download:done"]();
  }
});

$("#stopDownloadBtn").addEventListener("click", async () => {
  await window.pywebview.api.stop_download();
  $("#stopDownloadBtn").disabled = true;
});

// ============================================================
// VIDEO tab
// ============================================================
$("#videoBrowseBtn").addEventListener("click", async () => {
  const path = await window.pywebview.api.browse_directory();
  if (path) {
    state.videoOutputDir = path;
    $("#videoPathDisplay").textContent = path;
    $("#videoPathDisplay").classList.remove("empty");
  }
});

let videoMode = "video";  // "video" | "audio"

$$("#videoMode .seg-btn").forEach((b) => {
  b.addEventListener("click", () => {
    $$("#videoMode .seg-btn").forEach((x) => x.classList.remove("active"));
    b.classList.add("active");
    videoMode = b.dataset.mode;
    $("#videoQualityField").style.display = videoMode === "audio" ? "none" : "";
  });
});

$("#videoDownloadBtn").addEventListener("click", async () => {
  const url = $("#videoUrlInput").value.trim();
  if (!url) {
    toast("Inserisci un URL", "error");
    return;
  }
  if (!state.videoOutputDir) {
    toast("Seleziona una cartella di destinazione", "error");
    return;
  }

  state.videoDownloading = true;
  $("#videoDownloadBtn").disabled = true;
  $("#stopVideoBtn").disabled = false;
  $("#videoProgressFill").style.width = "0%";
  $("#videoPercent").textContent = "0%";

  const res = await window.pywebview.api.start_video_download({
    urls: [url],
    output_dir: state.videoOutputDir,
    quality: $("#videoQuality").value,
    audio_only: videoMode === "audio",
  });
  if (!res.ok) {
    if (!handleGateBlock(res)) toast(res.error || "Errore", "error");
    bridgeHandlers["video:done"]();
  }
});

$("#stopVideoBtn").addEventListener("click", async () => {
  await window.pywebview.api.stop_video_download();
  $("#stopVideoBtn").disabled = true;
});

// ============================================================
// UPGRADE tab
// ============================================================
$("#upBrowseBtn").addEventListener("click", async () => {
  const path = await window.pywebview.api.browse_directory();
  if (path) {
    state.upDir = path;
    $("#upPathDisplay").textContent = path;
    $("#upPathDisplay").classList.remove("empty");
    await refreshUpgradeScan();
  }
});

$("#upRecursive").addEventListener("change", refreshUpgradeScan);

async function refreshUpgradeScan() {
  if (!state.upDir) return;
  const res = await window.pywebview.api.scan_audio_folder(state.upDir, $("#upRecursive").checked);
  const info = $("#upInfo");
  if (!res.ok) {
    info.textContent = "Errore scansione: " + (res.error || "");
    return;
  }
  if (!res.total) {
    info.textContent = "Nessun file audio trovato";
    return;
  }
  if (res.done > 0) {
    info.textContent = `● ${res.total} file audio · ${res.done} già convertiti · ${res.remaining} da fare`;
  } else {
    info.textContent = `● ${res.total} file audio trovati`;
  }
}

$("#upgradeBtn").addEventListener("click", async () => {
  if (!state.upDir) {
    toast("Seleziona una cartella", "error");
    return;
  }
  state.upgrading = true;
  $("#upgradeBtn").disabled = true;
  $("#stopUpgradeBtn").disabled = false;
  $("#upProgressFill").style.width = "0%";
  $("#upPercent").textContent = "0%";

  const res = await window.pywebview.api.start_upgrade({
    directory: state.upDir,
    recursive: $("#upRecursive").checked,
    threshold: parseInt($("#upThreshold").value, 10) || 310,
  });
  if (!res.ok) {
    if (!handleGateBlock(res)) toast(res.error || "Errore", "error");
    bridgeHandlers["upgrade:done"]();
  }
});

$("#stopUpgradeBtn").addEventListener("click", async () => {
  await window.pywebview.api.stop_upgrade();
  $("#stopUpgradeBtn").disabled = true;
});

// ============================================================
// RECORDER tab
// ============================================================
$("#recRefreshBtn").addEventListener("click", refreshRecDevices);

$("#recOpenGuide").addEventListener("click", (e) => {
  e.preventDefault();
  showView("guide");
  setTimeout(() => {
    const el = document.getElementById("g-record");
    if (el) el.scrollIntoView({ behavior: "smooth", block: "start" });
  }, 80);
});

// ============================================================
// GUIDE — link esterni + TOC active highlight
// ============================================================
document.querySelectorAll("#view-guide a[data-ext]").forEach((a) => {
  a.addEventListener("click", (e) => {
    e.preventDefault();
    window.pywebview.api.open_external_url(a.dataset.ext);
  });
});

document.querySelectorAll(".toc-link").forEach((a) => {
  a.addEventListener("click", (e) => {
    e.preventDefault();
    const id = a.getAttribute("href").slice(1);
    const el = document.getElementById(id);
    if (el) el.scrollIntoView({ behavior: "smooth", block: "start" });
  });
});

// Aggiorna TOC active in base allo scroll della view
function setupGuideObserver() {
  const sections = document.querySelectorAll(".g-section[id]");
  const tocLinks = document.querySelectorAll(".toc-link");
  if (!sections.length || !tocLinks.length) return;

  const main = document.querySelector(".main");
  const observer = new IntersectionObserver(
    (entries) => {
      entries.forEach((entry) => {
        if (!entry.isIntersecting) return;
        const id = entry.target.id;
        tocLinks.forEach((l) => {
          l.classList.toggle("active", l.getAttribute("href") === "#" + id);
        });
      });
    },
    { root: main, rootMargin: "-20% 0px -65% 0px", threshold: 0 }
  );
  sections.forEach((s) => observer.observe(s));
}
setupGuideObserver();

$("#recBrowseBtn").addEventListener("click", async () => {
  const path = await window.pywebview.api.browse_directory();
  if (path) {
    state.rec.outputDir = path;
    $("#recPathDisplay").textContent = path;
    $("#recPathDisplay").classList.remove("empty");
  }
});

$("#recStartBtn").addEventListener("click", async () => {
  const deviceId = $("#recDevice").value;
  if (!deviceId) {
    toast("Seleziona un dispositivo", "error");
    return;
  }
  if (!state.rec.outputDir) {
    toast("Seleziona una cartella di destinazione", "error");
    return;
  }
  const res = await window.pywebview.api.start_audio_recording({
    device_id: deviceId,
    output_dir: state.rec.outputDir,
    filename: $("#recFilename").value.trim(),
    bitrate: $("#recBitrate").value,
  });
  if (!res.ok) {
    if (!handleGateBlock(res)) toast(res.error || "Errore", "error");
  }
});

$("#recStopBtn").addEventListener("click", async () => {
  $("#recStopBtn").disabled = true;
  await window.pywebview.api.stop_audio_recording();
});

$("#recShowLogBtn")?.addEventListener("click", async () => {
  const pre = $("#recErrorLog");
  if (!pre.hidden) {
    pre.hidden = true;
    $("#recShowLogBtn").textContent = "Mostra log tecnici";
    $("#recCopyLogBtn").hidden = true;
    return;
  }
  const res = await window.pywebview.api.get_recorder_log();
  const lines = (res && res.lines) || [];
  pre.textContent = lines.length ? lines.join("\n") : "(log vuoto)";
  pre.hidden = false;
  $("#recShowLogBtn").textContent = "Nascondi log tecnici";
  $("#recCopyLogBtn").hidden = false;
});

$("#recCopyLogBtn")?.addEventListener("click", async () => {
  const text = $("#recErrorLog").textContent || "";
  try {
    await navigator.clipboard.writeText(text);
    toast("Log copiato negli appunti", "success");
  } catch {
    toast("Impossibile copiare", "error");
  }
});

// ============================================================
// METADATA editor
// ============================================================
function formatDuration(sec) {
  if (!sec) return "—";
  const m = Math.floor(sec / 60);
  const s = Math.floor(sec % 60);
  return `${m}:${s.toString().padStart(2, "0")}`;
}

function populateMetaForm(d) {
  $("#metaTitle").value = d.title || "";
  $("#metaArtist").value = d.artist || "";
  $("#metaAlbum").value = d.album || "";
  $("#metaAlbumArtist").value = d.album_artist || "";
  $("#metaYear").value = d.year || "";
  $("#metaTrack").value = d.track || "";
  $("#metaGenre").value = d.genre || "";
  $("#metaBpm").value = d.bpm || "";
  $("#metaKey").value = d.key || "";
  $("#metaComment").value = d.comment || "";

  // WhereFroms (macOS only)
  if (d.is_macos) {
    $("#metaWhereFromField").hidden = false;
    $("#metaWhereFrom").value = (d.where_from || []).join("\n");
  } else {
    $("#metaWhereFromField").hidden = true;
    $("#metaWhereFrom").value = "";
  }

  // Info riga sotto il path
  const info = $("#metaInfo");
  info.hidden = false;
  info.innerHTML = `
    <span><strong>Formato:</strong>${d.format || "—"}</span>
    <span><strong>Bitrate:</strong>${d.bitrate ? d.bitrate + " kbps" : "—"}</span>
    <span><strong>Durata:</strong>${formatDuration(d.duration)}</span>
  `;

  // Cover
  const preview = $("#metaCoverPreview");
  preview.innerHTML = "";
  if (d.cover_base64) {
    const img = document.createElement("img");
    img.src = `data:${d.cover_mime || "image/jpeg"};base64,${d.cover_base64}`;
    preview.appendChild(img);
  } else {
    const span = document.createElement("span");
    span.className = "cover-empty";
    span.textContent = "Nessuna copertina";
    preview.appendChild(span);
  }
  $("#metaCoverHint").textContent = "";
  $("#metaCoverHint").className = "cover-hint";

  state.meta.newCoverPath = "";
  state.meta.removeCover = false;
}

async function loadMetaFile(path) {
  const res = await window.pywebview.api.read_metadata(path);
  if (!res.ok) {
    toast("Errore lettura: " + (res.error || ""), "error");
    return;
  }
  state.meta.path = path;
  $("#metaPathDisplay").textContent = path;
  $("#metaPathDisplay").classList.remove("empty");
  $("#metaForm").hidden = false;
  populateMetaForm(res.data);
}

$("#metaPickBtn").addEventListener("click", async () => {
  const path = await window.pywebview.api.pick_audio_file();
  if (path) await loadMetaFile(path);
});

$("#metaCoverBtn").addEventListener("click", async () => {
  const path = await window.pywebview.api.pick_image_file();
  if (!path) return;
  state.meta.newCoverPath = path;
  state.meta.removeCover = false;

  // Mostra anteprima leggendo il file via fetch (file:// non funziona da webview;
  // usiamo solo il nome come hint, l'utente vedra il risultato dopo Save)
  const hint = $("#metaCoverHint");
  hint.textContent = "Nuova copertina: " + path.split("/").pop();
  hint.className = "cover-hint set";
});

$("#metaCoverRemoveBtn").addEventListener("click", () => {
  state.meta.newCoverPath = "";
  state.meta.removeCover = true;
  const preview = $("#metaCoverPreview");
  preview.innerHTML = '<span class="cover-empty">Verra rimossa al salvataggio</span>';
  const hint = $("#metaCoverHint");
  hint.textContent = "Copertina marcata per rimozione";
  hint.className = "cover-hint remove";
});

$("#metaReloadBtn").addEventListener("click", async () => {
  if (state.meta.path) await loadMetaFile(state.meta.path);
});

$("#metaSaveBtn").addEventListener("click", async () => {
  if (!state.meta.path) {
    toast("Nessun file caricato", "error");
    return;
  }

  $("#metaSaveBtn").disabled = true;
  const status = $("#metaStatus");
  status.textContent = "Salvataggio…";

  const payload = {
    path: state.meta.path,
    data: {
      title: $("#metaTitle").value,
      artist: $("#metaArtist").value,
      album: $("#metaAlbum").value,
      album_artist: $("#metaAlbumArtist").value,
      year: $("#metaYear").value,
      track: $("#metaTrack").value,
      genre: $("#metaGenre").value,
      bpm: $("#metaBpm").value,
      key: $("#metaKey").value,
      comment: $("#metaComment").value,
      where_from: $("#metaWhereFrom").value
        .split("\n")
        .map(s => s.trim())
        .filter(Boolean),
    },
    cover_path: state.meta.newCoverPath,
    remove_cover: state.meta.removeCover,
  };

  const res = await window.pywebview.api.save_metadata(payload);
  $("#metaSaveBtn").disabled = false;

  if (res.ok) {
    status.textContent = "✓ Tag salvati";
    toast("Tag salvati", "success");
    // Ricarica per mostrare lo stato aggiornato (es. nuova cover)
    await loadMetaFile(state.meta.path);
  } else {
    status.textContent = "";
    if (!handleGateBlock(res)) toast("Errore: " + (res.error || ""), "error");
  }
});

// ============================================================
// SETTINGS tab
// ============================================================
$("#toggleSecretBtn").addEventListener("click", () => {
  state.showSecret = !state.showSecret;
  $("#clientSecretInput").type = state.showSecret ? "text" : "password";
  $("#toggleSecretBtn").textContent = state.showSecret ? "Nascondi" : "Mostra";
});

$("#browseCookiesBtn").addEventListener("click", async () => {
  const path = await window.pywebview.api.browse_file([
    "Text files (*.txt)",
    "All files (*.*)",
  ]);
  if (path) $("#cookiesInput").value = path;
});

$("#browseOutputBtn").addEventListener("click", async () => {
  const path = await window.pywebview.api.browse_directory();
  if (path) $("#outputInput").value = path;
});

$("#themeSelect").addEventListener("change", (e) => {
  applyTheme(e.target.value);
});

$("#saveBtn").addEventListener("click", async () => {
  const payload = {
    client_id: $("#clientIdInput").value,
    client_secret: $("#clientSecretInput").value,
    bitrate: $("#bitrateSelect").value,
    hq_threshold: parseInt($("#hqThresholdInput").value, 10) || 310,
    cookies_path: $("#cookiesInput").value,
    output_dir: $("#outputInput").value,
    theme: $("#themeSelect").value,
  };
  applyTheme(payload.theme);
  const res = await window.pywebview.api.save_settings(payload);
  if (res.ok) {
    state.config = payload;
    // sync Download tab default path
    if (!state.dlOutputDir && payload.output_dir) {
      state.dlOutputDir = payload.output_dir;
      $("#dlPathDisplay").textContent = payload.output_dir;
      $("#dlPathDisplay").classList.remove("empty");
    }
    const status = $("#saveStatus");
    status.textContent = "✓ Impostazioni salvate";
    status.classList.add("show");
    setTimeout(() => status.classList.remove("show"), 2500);
  } else {
    toast("Errore nel salvataggio", "error");
  }
});

$("#openDashboardBtn").addEventListener("click", () => {
  window.pywebview.api.open_external_url("https://developer.spotify.com/dashboard");
});

$("#showGuideBtn").addEventListener("click", () => {
  $("#guideModal").hidden = false;
});

$("#guideCloseBtn").addEventListener("click", () => { $("#guideModal").hidden = true; });
$("#guideCloseBtn2").addEventListener("click", () => { $("#guideModal").hidden = true; });
$("#guideOpenDashBtn").addEventListener("click", () => {
  window.pywebview.api.open_external_url("https://developer.spotify.com/dashboard");
});

$("#checkUpdateBtn").addEventListener("click", async () => {
  const btn = $("#checkUpdateBtn");
  const status = $("#updateStatus");
  const notes = $("#updateNotes");
  const dlBtn = $("#downloadUpdateBtn");

  btn.disabled = true;
  btn.textContent = "Controllo...";
  status.className = "update-status";
  status.textContent = "";
  notes.textContent = "";
  dlBtn.hidden = true;

  const res = await window.pywebview.api.check_update();
  btn.disabled = false;
  btn.textContent = "Controlla aggiornamenti";

  if (!res.ok) {
    status.className = "update-status err";
    status.textContent = "Errore: " + (res.error || "");
    return;
  }
  if (res.is_new) {
    status.className = "update-status warn";
    status.textContent = `Nuova versione disponibile: ${res.remote}`;
    if (res.download_url) {
      dlBtn.hidden = false;
      dlBtn.onclick = () => window.pywebview.api.open_external_url(res.download_url);
    }
    if (res.notes) notes.textContent = res.notes;
  } else {
    status.className = "update-status ok";
    status.textContent = "✓ Sei aggiornato!";
  }
});

// ============================================================
// Licenza: listener dello schermo di attivazione + impostazioni
// ============================================================
$("#actActivateBtn")?.addEventListener("click", activateLicense);
$("#actBuyBtn")?.addEventListener("click", async () => {
  await window.pywebview.api.open_purchase_page();
});
$("#actKey")?.addEventListener("keydown", (e) => {
  if (e.key === "Enter") activateLicense();
});

$("#deactivateLicenseBtn")?.addEventListener("click", deactivateLicense);

$("#revalidateLicenseBtn")?.addEventListener("click", async () => {
  const btn = $("#revalidateLicenseBtn");
  btn.disabled = true;
  const old = btn.textContent;
  btn.textContent = "Verifica in corso…";
  try {
    const res = await window.pywebview.api.revalidate_license();
    if (res.ok) {
      state.license = res.license;
      renderLicenseStatus();
      applyPlanGate();
      refreshQuota();
      if (res.license.licensed) {
        toast("Licenza verificata", "success");
      } else {
        applyLicenseGate();
        toast("Licenza non piu valida", "error");
      }
    }
  } finally {
    btn.disabled = false;
    btn.textContent = old;
  }
});

// ============================================================
// Modal Upgrade
// ============================================================
$("#upgradeCloseBtn")?.addEventListener("click", hideUpgradeModal);
$("#upgradeCloseBtn2")?.addEventListener("click", hideUpgradeModal);
$("#upgradeModal")?.addEventListener("click", (e) => {
  if (e.target === e.currentTarget) hideUpgradeModal();
});
$("#upgradeOpenBtn")?.addEventListener("click", async () => {
  hideUpgradeModal();
  try { await window.pywebview.api.open_purchase_page(); } catch (_e) {}
});
$("#quotaUpgradeBtn")?.addEventListener("click", async () => {
  try { await window.pywebview.api.open_purchase_page(); } catch (_e) {}
});

// ============================================================
// BEATPORT tab — carica Top 100 per genere, seleziona tracce, scarica
// (il download riusa start_tracks_download, quindi passa dagli stessi
// canali "download:progress" / "download:done" / log view="download")
// ============================================================
const BeatportUI = (function () {
  let genres = [];
  let currentTracks = [];
  let existing = [];
  let currentGenreName = "";
  let currentGenreSlug = "";
  let downloading = false;

  function fmtDur(sec) {
    const n = Number(sec) || 0;
    const m = Math.floor(n / 60);
    const s = Math.floor(n % 60);
    return `${m}:${String(s).padStart(2, "0")}`;
  }

  function safeGenreFolder(name) {
    return String(name || "").replace(/[\/\\]/g, "_").trim();
  }

  function populateSelect() {
    const sel = $("#beatport-genre");
    if (!sel) return;
    sel.innerHTML = "";
    for (const g of genres) {
      const opt = document.createElement("option");
      opt.value = g.slug;
      opt.textContent = g.name;
      sel.appendChild(opt);
    }
  }

  function updateOutputInfo() {
    const info = $("#beatport-output-info");
    if (!info) return;
    const root = (state.config && state.config.output_dir) || "";
    if (!root) {
      info.textContent = "⚠ Imposta la cartella output in Impostazioni prima di scaricare";
      info.className = "beatport-output-info warn";
      return;
    }
    const folder = safeGenreFolder(currentGenreName);
    info.textContent = folder
      ? `Destinazione: ${root}/Beatport/${folder}`
      : `Destinazione: ${root}/Beatport`;
    info.className = "beatport-output-info";
  }

  function setStatus(text, kind) {
    const el = $("#beatport-status");
    if (!el) return;
    el.textContent = text || "";
    el.className = "beatport-status" + (kind ? " " + kind : "");
  }

  async function loadChart(forceRefresh) {
    const sel = $("#beatport-genre");
    const slug = sel && sel.value;
    if (!slug) return;
    const genreName = (sel.selectedOptions[0] && sel.selectedOptions[0].textContent) || slug;
    currentGenreSlug = slug;
    currentGenreName = genreName;

    setStatus(forceRefresh ? "Ricarico Top 100 (bypass cache)…" : "Caricamento Top 100…", "loading");
    $("#beatport-table").hidden = true;
    $("#beatport-toolbar").hidden = true;
    $("#beatport-table").querySelector("tbody").innerHTML = "";

    let res;
    try {
      res = await window.pywebview.api.beatport_fetch_chart(slug, !!forceRefresh);
    } catch (e) {
      setStatus("Errore: " + ((e && e.message) || e), "error");
      return;
    }
    if (!res || !res.ok) {
      const code = res && res.error;
      let msg = (res && res.message) || "Errore sconosciuto";
      if (code === "invalid_genre") msg = "Genere non valido";
      else if (code === "unreachable") msg = "Beatport non raggiungibile — riprova più tardi";
      else if (code === "parse") msg = "Impossibile leggere i dati (schema pagina cambiato?)";
      setStatus(msg, "error");
      return;
    }

    currentTracks = res.tracks || [];
    try {
      existing = await window.pywebview.api.beatport_check_existing(currentTracks, currentGenreName);
    } catch (_e) {
      existing = currentTracks.map(() => false);
    }
    setStatus(`${currentTracks.length} brani caricati`, "ok");
    renderTable();
  }

  function renderTable() {
    const table = $("#beatport-table");
    const tbody = table.querySelector("tbody");
    tbody.innerHTML = "";

    currentTracks.forEach((t, i) => {
      const tr = document.createElement("tr");
      if (existing[i]) tr.classList.add("already-downloaded");

      const tdCheck = document.createElement("td");
      tdCheck.className = "col-check";
      const cb = document.createElement("input");
      cb.type = "checkbox";
      cb.dataset.idx = String(i);
      cb.checked = !existing[i];
      cb.addEventListener("change", updateSelectionCount);
      tdCheck.appendChild(cb);
      tr.appendChild(tdCheck);

      const tdPos = document.createElement("td");
      tdPos.className = "col-pos";
      tdPos.textContent = String(t.position || (i + 1));
      tr.appendChild(tdPos);

      const tdArtist = document.createElement("td");
      tdArtist.textContent = t.artists || "";
      tr.appendChild(tdArtist);

      const tdTitle = document.createElement("td");
      tdTitle.textContent = t.mix ? `${t.title} (${t.mix})` : (t.title || "");
      tr.appendChild(tdTitle);

      const tdDur = document.createElement("td");
      tdDur.className = "col-dur";
      tdDur.textContent = fmtDur(t.duration_sec);
      tr.appendChild(tdDur);

      const tdState = document.createElement("td");
      tdState.className = "col-state";
      if (existing[i]) tdState.textContent = "✓ già scaricato";
      tr.appendChild(tdState);

      tbody.appendChild(tr);
    });

    table.hidden = false;
    $("#beatport-toolbar").hidden = false;
    updateOutputInfo();
    updateSelectionCount();
  }

  function updateSelectionCount() {
    const boxes = $$("#beatport-table tbody input[type=checkbox]");
    const total = boxes.length;
    const checked = boxes.filter((b) => b.checked).length;
    $("#beatport-selected-count").textContent = `${checked}/${total} selezionati`;
    const dlBtn = $("#beatport-download-btn");
    if (dlBtn) dlBtn.disabled = downloading || checked === 0;

    const master = $("#beatport-select-all");
    if (master) {
      if (total === 0) { master.checked = false; master.indeterminate = false; }
      else if (checked === 0) { master.checked = false; master.indeterminate = false; }
      else if (checked === total) { master.checked = true; master.indeterminate = false; }
      else { master.checked = false; master.indeterminate = true; }
    }
  }

  function toggleAll(checked) {
    $$("#beatport-table tbody input[type=checkbox]").forEach((b) => { b.checked = checked; });
    updateSelectionCount();
  }

  function appendBeatportLog(msg) {
    const el = $("#beatport-log");
    if (!el) return;
    const cls = classifyLog(msg);
    const line = document.createElement("div");
    if (cls) line.className = cls;
    line.textContent = msg;
    el.appendChild(line);
    el.scrollTop = el.scrollHeight;
  }

  async function startDownload() {
    const boxes = $$("#beatport-table tbody input[type=checkbox]");
    const selected = [];
    boxes.forEach((b) => {
      if (b.checked) {
        const idx = parseInt(b.dataset.idx, 10);
        if (!isNaN(idx) && currentTracks[idx]) selected.push(currentTracks[idx]);
      }
    });
    if (!selected.length) {
      toast("Seleziona almeno un brano", "error");
      return;
    }
    if (!state.config || !state.config.output_dir) {
      toast("Imposta la cartella output in Impostazioni", "error");
      return;
    }

    downloading = true;
    $("#beatport-download-btn").disabled = true;
    $("#beatport-stop-btn").hidden = false;
    $("#beatport-stop-btn").disabled = false;
    $("#beatport-log").innerHTML = "";
    appendBeatportLog(`[INFO] Avvio download di ${selected.length} brani da ${currentGenreName}…`);

    let res;
    try {
      res = await window.pywebview.api.beatport_download_selected(selected, currentGenreName);
    } catch (e) {
      appendBeatportLog("[ERRORE] " + ((e && e.message) || e));
      finishDownload();
      return;
    }
    if (!res || !res.ok) {
      const errMsg = (res && (res.error || res.message)) || "Impossibile avviare il download";
      appendBeatportLog("[ERRORE] " + errMsg);
      if (!handleGateBlock(res || {})) toast(errMsg, "error");
      finishDownload();
    }
  }

  async function stopDownload() {
    try {
      await window.pywebview.api.stop_download();
    } catch (e) { console.error(e); }
  }

  function finishDownload() {
    downloading = false;
    $("#beatport-stop-btn").hidden = true;
    $("#beatport-stop-btn").disabled = true;
    updateSelectionCount();
    // Re-check existing per aggiornare i badge "già scaricato"
    if (currentTracks.length) {
      window.pywebview.api.beatport_check_existing(currentTracks, currentGenreName)
        .then((res) => { existing = res || existing; renderTable(); })
        .catch(() => {});
    }
  }

  async function init() {
    // Popola dropdown generi
    try {
      genres = await window.pywebview.api.beatport_genres();
    } catch (e) {
      console.error("Beatport: impossibile caricare i generi", e);
      genres = [];
    }
    populateSelect();

    // Ripristina l'ultimo genere selezionato (state.config gia' caricato)
    const last = (state.config && state.config.beatport_last_genre) || "";
    const sel = $("#beatport-genre");
    if (sel && last && genres.some((g) => g.slug === last)) {
      sel.value = last;
    }
    updateOutputInfo();

    // Bind eventi
    $("#beatport-load-btn").addEventListener("click", (e) => loadChart(e.shiftKey));
    $("#beatport-download-btn").addEventListener("click", startDownload);
    $("#beatport-stop-btn").addEventListener("click", stopDownload);
    $("#beatport-select-all").addEventListener("change", (e) => toggleAll(e.target.checked));

    // Aggancia agli event listener esistenti del canale "download" senza rompere
    // il comportamento della tab Scarica (wrapping additivo).
    const origProgress = bridgeHandlers["download:progress"];
    bridgeHandlers["download:progress"] = (p) => {
      if (origProgress) origProgress(p);
      // I contatori del tab Scarica sono aggiornati dall'handler originale;
      // qui potremmo aggiungere un contatore Beatport, ma i log sono sufficienti.
    };
    const origDone = bridgeHandlers["download:done"];
    bridgeHandlers["download:done"] = (p) => {
      if (origDone) origDone(p);
      if (downloading) finishDownload();
    };
    const origLog = bridgeHandlers["log"];
    bridgeHandlers["log"] = ({ view, msg }) => {
      if (origLog) origLog({ view, msg });
      if (downloading && view === "download") appendBeatportLog(msg);
    };
  }

  return { init };
})();

// =====================================================================
// Spotify search
// =====================================================================
const SpotifyUI = (() => {
  // NOTE: local module state — named `mstate` to NOT shadow the outer
  // module-level `state` (which holds `state.config`).
  const mstate = { tracks: [], existing: [], downloading: false };

  function _escape(s) {
    const d = document.createElement("div");
    d.textContent = s == null ? "" : String(s);
    return d.innerHTML;
  }

  function _fmtDuration(sec) {
    const n = Math.max(0, Math.floor(Number(sec) || 0));
    const m = Math.floor(n / 60);
    const s = n % 60;
    return `${m}:${String(s).padStart(2, "0")}`;
  }

  function updateSelectionCount() {
    const boxes = $$("#spotify-tbody input[type=checkbox]");
    const total = boxes.length;
    const selected = boxes.filter((b) => b.checked).length;
    $("#spotify-selected-count").textContent = `${selected}/${total} selezionati`;
    const btn = $("#spotify-download-btn");
    if (btn) {
      btn.disabled = mstate.downloading || selected === 0;
      btn.innerHTML = `<span class="ico">▶</span> Scarica selezionati${selected ? ` (${selected})` : ""}`;
    }
    const sa = $("#spotify-select-all");
    if (sa) {
      if (total === 0) { sa.checked = false; sa.indeterminate = false; }
      else if (selected === 0) { sa.checked = false; sa.indeterminate = false; }
      else if (selected === total) { sa.checked = true; sa.indeterminate = false; }
      else { sa.checked = false; sa.indeterminate = true; }
    }
  }

  function renderTable() {
    const tbody = $("#spotify-tbody");
    if (!tbody) return;
    tbody.innerHTML = "";
    mstate.tracks.forEach((t, i) => {
      const already = !!mstate.existing[i];
      const tr = document.createElement("tr");
      tr.dataset.idx = String(i);
      if (already) tr.classList.add("already-downloaded");
      tr.innerHTML = `
        <td class="col-check"><input type="checkbox" data-idx="${i}" ${already ? "" : "checked"} /></td>
        <td class="col-pos">${i + 1}</td>
        <td>${_escape(t.artists)}</td>
        <td>${_escape(t.name)}</td>
        <td>${_escape(t.album)}</td>
        <td class="col-dur">${_fmtDuration(t.duration_sec)}</td>
        <td class="col-state">${already ? "✓ già scaricato" : ""}</td>
      `;
      const cb = tr.querySelector("input[type=checkbox]");
      if (cb) cb.addEventListener("change", updateSelectionCount);
      tbody.appendChild(tr);
    });
    updateSelectionCount();
  }

  function setStatus(text, kind) {
    const el = $("#spotify-status");
    if (!el) return;
    el.textContent = text || "";
    el.className = "beatport-status" + (kind ? " " + kind : "");
  }

  function updateOutputInfo() {
    const info = $("#spotify-output-info");
    if (!info) return;
    const root = (state.config && state.config.output_dir) || "";
    if (!root) {
      info.textContent = "⚠ Imposta la cartella output in Impostazioni prima di scaricare";
      info.className = "beatport-output-info warn";
    } else {
      info.textContent = `Destinazione: ${root}/Spotify`;
      info.className = "beatport-output-info";
    }
  }

  async function doSearch() {
    const q = ($("#spotify-query").value || "").trim();
    if (!q) return;
    const artistMode = $("#spotify-artist-mode").checked;
    const wrap = $("#spotify-table-wrap");

    setStatus("Ricerca in corso…", "loading");
    if (wrap) wrap.hidden = true;

    let res;
    try {
      res = await window.pywebview.api.spotify_search(q, artistMode);
    } catch (e) {
      setStatus("Errore: " + ((e && e.message) || e), "error");
      return;
    }
    if (!res || !res.ok) {
      const errKey = res && res.error;
      const messages = {
        empty_query: "Inserisci una query di ricerca.",
        no_creds: "Credenziali Spotify mancanti. Vai su Impostazioni.",
        auth: "Impossibile autenticarsi con Spotify. Verifica le credenziali.",
      };
      setStatus(messages[errKey] || (res && res.message) || "Errore sconosciuto", "error");
      return;
    }

    mstate.tracks = res.tracks || [];
    if (mstate.tracks.length === 0) {
      setStatus(`Nessun brano trovato per "${q}".`, "");
      return;
    }
    try {
      mstate.existing = await window.pywebview.api.spotify_check_existing(mstate.tracks);
    } catch (_e) {
      mstate.existing = mstate.tracks.map(() => false);
    }

    setStatus(`${mstate.tracks.length} risultati`, "ok");
    updateOutputInfo();
    renderTable();
    if (wrap) wrap.hidden = false;
  }

  function appendSpotifyLog(msg) {
    const el = $("#spotify-log");
    if (!el) return;
    const cls = classifyLog(msg);
    const line = document.createElement("div");
    if (cls) line.className = cls;
    line.textContent = msg;
    el.appendChild(line);
    el.scrollTop = el.scrollHeight;
  }

  async function startDownload() {
    const boxes = $$("#spotify-tbody input[type=checkbox]");
    const selected = [];
    boxes.forEach((b) => {
      if (b.checked) {
        const idx = parseInt(b.dataset.idx, 10);
        if (!isNaN(idx) && mstate.tracks[idx]) selected.push(mstate.tracks[idx]);
      }
    });
    if (!selected.length) {
      toast("Seleziona almeno un brano", "error");
      return;
    }
    if (!state.config || !state.config.output_dir) {
      toast("Imposta la cartella output in Impostazioni", "error");
      return;
    }

    mstate.downloading = true;
    $("#spotify-download-btn").disabled = true;
    $("#spotify-stop-btn").hidden = false;
    $("#spotify-stop-btn").disabled = false;
    $("#spotify-log").innerHTML = "";
    appendSpotifyLog(`[INFO] Avvio download di ${selected.length} brani…`);

    let res;
    try {
      res = await window.pywebview.api.spotify_search_download(selected);
    } catch (e) {
      appendSpotifyLog("[ERRORE] " + ((e && e.message) || e));
      finishDownload();
      return;
    }
    if (!res || !res.ok) {
      const errMsg = (res && (res.error || res.message)) || "Impossibile avviare il download";
      appendSpotifyLog("[ERRORE] " + errMsg);
      if (!handleGateBlock(res || {})) toast(errMsg, "error");
      finishDownload();
    }
  }

  async function stopDownload() {
    try { await window.pywebview.api.stop_download(); } catch (e) { console.error(e); }
  }

  function finishDownload() {
    mstate.downloading = false;
    $("#spotify-stop-btn").hidden = true;
    $("#spotify-stop-btn").disabled = true;
    updateSelectionCount();
    if (mstate.tracks.length) {
      window.pywebview.api.spotify_check_existing(mstate.tracks)
        .then((r) => { mstate.existing = r || mstate.existing; renderTable(); })
        .catch(() => {});
    }
  }

  async function init() {
    // Pre-compila da config
    try {
      const q = (state.config && state.config.spotify_search_last_query) || "";
      const am = !!(state.config && state.config.spotify_search_artist_mode);
      const qi = $("#spotify-query");
      if (qi && q) qi.value = q;
      const ac = $("#spotify-artist-mode");
      if (ac) ac.checked = am;
    } catch (_e) { /* ignora */ }

    updateOutputInfo();

    $("#spotify-search-btn").addEventListener("click", doSearch);
    $("#spotify-query").addEventListener("keydown", (e) => { if (e.key === "Enter") doSearch(); });
    $("#spotify-select-all").addEventListener("change", (e) => {
      $$("#spotify-tbody input[type=checkbox]").forEach((b) => { b.checked = e.target.checked; });
      updateSelectionCount();
    });
    $("#spotify-download-btn").addEventListener("click", startDownload);
    $("#spotify-stop-btn").addEventListener("click", stopDownload);

    // Wrap bridge handlers additivamente
    const origLog = bridgeHandlers["log"];
    bridgeHandlers["log"] = (payload) => {
      if (origLog) origLog(payload);
      if (mstate.downloading && payload && payload.view === "download") {
        appendSpotifyLog(payload.msg);
      }
    };
    const origDone = bridgeHandlers["download:done"];
    bridgeHandlers["download:done"] = (payload) => {
      if (origDone) origDone(payload);
      if (mstate.downloading) finishDownload();
    };
  }

  return { init };
})();

// =====================================================================
// YouTube search
// =====================================================================
const YoutubeUI = (() => {
  const mstate = { tracks: [], existing: [], downloading: false };

  function _escape(s) {
    const d = document.createElement("div");
    d.textContent = s == null ? "" : String(s);
    return d.innerHTML;
  }
  function _fmtDuration(sec) {
    const n = Math.max(0, Math.floor(Number(sec) || 0));
    const m = Math.floor(n / 60);
    const s = n % 60;
    return `${m}:${String(s).padStart(2, "0")}`;
  }

  function updateSelectionCount() {
    const boxes = $$("#youtube-tbody input[type=checkbox]");
    const total = boxes.length;
    const selected = boxes.filter((b) => b.checked).length;
    $("#youtube-selected-count").textContent = `${selected}/${total} selezionati`;
    const btn = $("#youtube-download-btn");
    if (btn) {
      btn.disabled = mstate.downloading || selected === 0;
      btn.innerHTML = `<span class="ico">▶</span> Scarica selezionati${selected ? ` (${selected})` : ""}`;
    }
    const sa = $("#youtube-select-all");
    if (sa) {
      if (total === 0) { sa.checked = false; sa.indeterminate = false; }
      else if (selected === 0) { sa.checked = false; sa.indeterminate = false; }
      else if (selected === total) { sa.checked = true; sa.indeterminate = false; }
      else { sa.checked = false; sa.indeterminate = true; }
    }
  }

  function renderTable() {
    const tbody = $("#youtube-tbody");
    if (!tbody) return;
    tbody.innerHTML = "";
    mstate.tracks.forEach((t, i) => {
      const already = !!mstate.existing[i];
      const tr = document.createElement("tr");
      tr.dataset.idx = String(i);
      if (already) tr.classList.add("already-downloaded");
      tr.innerHTML = `
        <td class="col-check"><input type="checkbox" data-idx="${i}" ${already ? "" : "checked"} /></td>
        <td class="col-pos">${i + 1}</td>
        <td>${_escape(t.title)}</td>
        <td>${_escape(t.channel)}</td>
        <td class="col-dur">${_fmtDuration(t.duration_sec)}</td>
        <td class="col-state">${already ? "✓ già scaricato" : ""}</td>
      `;
      const cb = tr.querySelector("input[type=checkbox]");
      if (cb) cb.addEventListener("change", updateSelectionCount);
      tbody.appendChild(tr);
    });
    updateSelectionCount();
  }

  function setStatus(text, kind) {
    const el = $("#youtube-status");
    if (!el) return;
    el.textContent = text || "";
    el.className = "beatport-status" + (kind ? " " + kind : "");
  }

  function updateOutputInfo() {
    const info = $("#youtube-output-info");
    if (!info) return;
    const root = (state.config && state.config.output_dir) || "";
    if (!root) {
      info.textContent = "⚠ Imposta la cartella output in Impostazioni prima di scaricare";
      info.className = "beatport-output-info warn";
    } else {
      info.textContent = `Destinazione: ${root}/YouTube`;
      info.className = "beatport-output-info";
    }
  }

  async function doSearch() {
    const q = ($("#youtube-query").value || "").trim();
    if (!q) return;
    const wrap = $("#youtube-table-wrap");

    setStatus("Ricerca su YouTube in corso…", "loading");
    if (wrap) wrap.hidden = true;

    let res;
    try {
      res = await window.pywebview.api.youtube_search(q);
    } catch (e) {
      setStatus("Errore: " + ((e && e.message) || e), "error");
      return;
    }
    if (!res || !res.ok) {
      setStatus((res && res.message) || "Errore sconosciuto", "error");
      return;
    }

    mstate.tracks = res.tracks || [];
    if (mstate.tracks.length === 0) {
      setStatus(`Nessun video trovato per "${q}".`, "");
      return;
    }
    try {
      mstate.existing = await window.pywebview.api.youtube_check_existing(mstate.tracks);
    } catch (_e) {
      mstate.existing = mstate.tracks.map(() => false);
    }

    setStatus(`${mstate.tracks.length} risultati`, "ok");
    updateOutputInfo();
    renderTable();
    if (wrap) wrap.hidden = false;
  }

  function appendYoutubeLog(msg) {
    const el = $("#youtube-log");
    if (!el) return;
    const cls = classifyLog(msg);
    const line = document.createElement("div");
    if (cls) line.className = cls;
    line.textContent = msg;
    el.appendChild(line);
    el.scrollTop = el.scrollHeight;
  }

  async function startDownload() {
    const boxes = $$("#youtube-tbody input[type=checkbox]");
    const selected = [];
    boxes.forEach((b) => {
      if (b.checked) {
        const idx = parseInt(b.dataset.idx, 10);
        if (!isNaN(idx) && mstate.tracks[idx]) selected.push(mstate.tracks[idx]);
      }
    });
    if (!selected.length) {
      toast("Seleziona almeno un video", "error");
      return;
    }
    if (!state.config || !state.config.output_dir) {
      toast("Imposta la cartella output in Impostazioni", "error");
      return;
    }

    mstate.downloading = true;
    $("#youtube-download-btn").disabled = true;
    $("#youtube-stop-btn").hidden = false;
    $("#youtube-stop-btn").disabled = false;
    $("#youtube-log").innerHTML = "";
    appendYoutubeLog(`[INFO] Avvio download di ${selected.length} video…`);

    let res;
    try {
      res = await window.pywebview.api.youtube_search_download(selected);
    } catch (e) {
      appendYoutubeLog("[ERRORE] " + ((e && e.message) || e));
      finishDownload();
      return;
    }
    if (!res || !res.ok) {
      const errMsg = (res && (res.error || res.message)) || "Impossibile avviare il download";
      appendYoutubeLog("[ERRORE] " + errMsg);
      if (!handleGateBlock(res || {})) toast(errMsg, "error");
      finishDownload();
    }
  }

  async function stopDownload() {
    try { await window.pywebview.api.stop_download(); } catch (e) { console.error(e); }
  }

  function finishDownload() {
    mstate.downloading = false;
    $("#youtube-stop-btn").hidden = true;
    $("#youtube-stop-btn").disabled = true;
    updateSelectionCount();
    if (mstate.tracks.length) {
      window.pywebview.api.youtube_check_existing(mstate.tracks)
        .then((r) => { mstate.existing = r || mstate.existing; renderTable(); })
        .catch(() => {});
    }
  }

  async function init() {
    try {
      const q = (state.config && state.config.youtube_search_last_query) || "";
      const qi = $("#youtube-query");
      if (qi && q) qi.value = q;
    } catch (_e) { /* ignora */ }

    updateOutputInfo();

    $("#youtube-search-btn").addEventListener("click", doSearch);
    $("#youtube-query").addEventListener("keydown", (e) => { if (e.key === "Enter") doSearch(); });
    $("#youtube-select-all").addEventListener("change", (e) => {
      $$("#youtube-tbody input[type=checkbox]").forEach((b) => { b.checked = e.target.checked; });
      updateSelectionCount();
    });
    $("#youtube-download-btn").addEventListener("click", startDownload);
    $("#youtube-stop-btn").addEventListener("click", stopDownload);

    const origLog = bridgeHandlers["log"];
    bridgeHandlers["log"] = (payload) => {
      if (origLog) origLog(payload);
      if (mstate.downloading && payload && payload.view === "download") {
        appendYoutubeLog(payload.msg);
      }
    };
    const origDone = bridgeHandlers["download:done"];
    bridgeHandlers["download:done"] = (payload) => {
      if (origDone) origDone(payload);
      if (mstate.downloading) finishDownload();
    };
  }

  return { init };
})();

// ============================================================
// Boot
// ============================================================
init().catch((e) => {
  console.error(e);
  toast("Errore di inizializzazione: " + e.message, "error");
});