"use strict";

const statusEl = document.getElementById("status");
const listEl = document.getElementById("urlList");
const openHistoryBtn = document.getElementById("openHistoryBtn");
const clearBtn = document.getElementById("clearBtn");

function setStatus(message) {
  statusEl.textContent = message;
}

function isUserCancelledError(result) {
  const error = result && typeof result.error === "string" ? result.error.toLowerCase() : "";
  return error.includes("canceled by the user") || error.includes("cancelled by the user");
}

function entryLabel(entry) {
  return entry && entry.fullUrl ? "full candidate" : "preview fallback";
}

function formatMeta(entry) {
  const packName = entry && entry.packName ? entry.packName : "n/a";
  const key = entry && entry.key ? entry.key : "n/a";
  const bpm = entry && entry.bpm ? entry.bpm : "n/a";
  return { packName, key, bpm };
}

function formatTags(entry) {
  if (!entry || !Array.isArray(entry.tags) || !entry.tags.length) {
    return "No tags";
  }
  const maxTags = 5;
  const tags = entry.tags.slice(0, maxTags);
  const suffix = entry.tags.length > maxTags ? ` +${entry.tags.length - maxTags}` : "";
  return tags.join(" • ") + suffix;
}

function createDownloadIcon() {
  const ns = "http://www.w3.org/2000/svg";
  const svg = document.createElementNS(ns, "svg");
  svg.setAttribute("viewBox", "0 0 24 24");
  svg.setAttribute("width", "22");
  svg.setAttribute("height", "22");
  svg.setAttribute("aria-hidden", "true");

  const arrow = document.createElementNS(ns, "path");
  arrow.setAttribute("d", "M12 4v10m0 0l4-4m-4 4l-4-4");
  arrow.setAttribute("fill", "none");
  arrow.setAttribute("stroke", "currentColor");
  arrow.setAttribute("stroke-width", "2");
  arrow.setAttribute("stroke-linecap", "round");
  arrow.setAttribute("stroke-linejoin", "round");

  const tray = document.createElementNS(ns, "path");
  tray.setAttribute("d", "M4 18v1a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-1");
  tray.setAttribute("fill", "none");
  tray.setAttribute("stroke", "currentColor");
  tray.setAttribute("stroke-width", "2");
  tray.setAttribute("stroke-linecap", "round");
  tray.setAttribute("stroke-linejoin", "round");

  svg.appendChild(arrow);
  svg.appendChild(tray);
  return svg;
}

function buildRow(entry) {
  const li = document.createElement("li");
  li.className = "url-item";
  const meta = formatMeta(entry);

  const head = document.createElement("div");
  head.className = "item-head";

  const cover = document.createElement("img");
  cover.className = "cover-image";
  cover.src = entry.coverImageUrl || "logo-single.png";
  cover.alt = "Cover art";
  cover.loading = "lazy";

  const info = document.createElement("div");
  info.className = "item-info";

  const title = document.createElement("p");
  title.className = "item-title";
  title.textContent = entry.fileName || entry.sampleId || "(unknown filename)";

  const sub = document.createElement("p");
  sub.className = "item-sub";
  sub.textContent = `${meta.packName} • ${entryLabel(entry)}`;

  const tags = document.createElement("p");
  tags.className = "item-tags";
  tags.textContent = formatTags(entry);

  const badges = document.createElement("div");
  badges.className = "item-badges";

  const keyBadge = document.createElement("span");
  keyBadge.className = "badge";
  keyBadge.textContent = `Key ${meta.key}`;

  const bpmBadge = document.createElement("span");
  bpmBadge.className = "badge";
  bpmBadge.textContent = `BPM ${meta.bpm}`;

  badges.appendChild(keyBadge);
  badges.appendChild(bpmBadge);
  info.appendChild(title);
  info.appendChild(sub);
  info.appendChild(tags);
  info.appendChild(badges);

  const download = document.createElement("button");
  download.type = "button";
  download.className = "download-icon-btn";
  download.setAttribute("aria-label", "Download sample");
  download.setAttribute("title", "Download sample");
  download.appendChild(createDownloadIcon());
  download.addEventListener("click", async () => {
    const result = await browser.runtime.sendMessage({ type: "DOWNLOAD_ENTRY", entry });
    if (!result || !result.ok) {
      if (isUserCancelledError(result)) {
        return;
      }
      window.alert((result && result.error) || "Download failed.");
      return;
    }
    setStatus(result.mode === "full" ? "Downloaded full file URL." : "Downloaded decoded preview fallback.");
  });

  head.appendChild(cover);
  head.appendChild(info);
  head.appendChild(download);
  li.appendChild(head);
  return li;
}

async function loadCapturedUrls() {
  const response = await browser.runtime.sendMessage({ type: "GET_HISTORY" });

  if (!response || !response.ok) {
    setStatus("Unable to load captured samples.");
    return;
  }

  listEl.innerHTML = "";
  const entries = Array.isArray(response.history) ? response.history : [];
  if (!entries.length) {
    setStatus("No captured samples yet.");
    return;
  }

  setStatus(`Captured samples: ${entries.length}`);
  for (const entry of entries) {
    listEl.appendChild(buildRow(entry));
  }
}

openHistoryBtn.addEventListener("click", async () => {
  await browser.runtime.sendMessage({ type: "OPEN_HISTORY" });
  window.close();
});

if (clearBtn) {
  clearBtn.addEventListener("click", async () => {
    const confirmed = window.confirm("Clear all captured samples and history?");
    if (!confirmed) {
      return;
    }
    const result = await browser.runtime.sendMessage({ type: "CLEAR_CAPTURED_STATE" });
    if (!result || !result.ok) {
      setStatus("Unable to clear captured samples.");
      return;
    }
    await loadCapturedUrls();
    setStatus("Captured samples cleared.");
  });
}

loadCapturedUrls().catch(() => {
  setStatus("Unexpected error while loading URLs.");
});