/* global chrome, browser */
const API = typeof chrome !== "undefined" ? chrome : browser;

function canonicalizeAliExpress(urlString) {
  const url = new URL(urlString);
  const path = url.pathname;
  const canonicalHost = "www.aliexpress.com";
  let productId = null;
  const itemMatch = path.match(/\/(item|i)\/(\d+)\.html/i);
  if (itemMatch) productId = itemMatch[2];
  if (!productId) {
    const xObjectId = url.searchParams.get("x_object_id") || url.searchParams.get("item_id");
    if (xObjectId && /^\d+$/.test(xObjectId)) productId = xObjectId;
  }
  if (productId) return `https://${canonicalHost}/item/${productId}.html`;
  return `https://${canonicalHost}${path}`;
}

function canonicalizeAlibaba(urlString) {
  const url = new URL(urlString);
  return `${url.origin}${url.pathname}`;
}

function canonicalize(urlString) {
  const url = new URL(urlString);
  const hostname = url.hostname.toLowerCase();
  if (hostname.includes("aliexpress.")) return { vendor: "AliExpress", url: canonicalizeAliExpress(urlString) };
  if (hostname.includes("alibaba.")) return { vendor: "Alibaba", url: canonicalizeAlibaba(urlString) };
  return { vendor: "Unknown", url: `${url.origin}${url.pathname}` };
}

async function shortenWithIsGd(longUrl) {
  const endpoint = `https://is.gd/create.php?format=simple&url=${encodeURIComponent(longUrl)}`;
  const res = await fetch(endpoint, { method: "GET" });
  const text = await res.text();
  if (!res.ok) throw new Error(text || `Shorten failed (${res.status})`);
  if (!/^https?:\/\//i.test(text)) throw new Error(text || "Shorten failed");
  return text.trim();
}

function createMenus() {
  try { API.contextMenus.removeAll(() => {}); } catch (e) {}
  API.contextMenus.create({
    id: "ali-clean",
    title: "Copy clean Ali link",
    contexts: ["page", "selection", "link"],
    documentUrlPatterns: [
      "*://*.aliexpress.*/*",
      "*://*.alibaba.*/*"
    ]
  });
  API.contextMenus.create({
    id: "ali-shorten",
    title: "Copy short Ali link",
    contexts: ["page", "selection", "link"],
    documentUrlPatterns: [
      "*://*.aliexpress.*/*",
      "*://*.alibaba.*/*"
    ]
  });
}

async function getRelevantUrl(info, tab) {
  if (info.linkUrl) return info.linkUrl;
  return tab && tab.url ? tab.url : null;
}

async function copyTextToClipboard(tabId, text) {
  // Using scripting to execute in page context for broad compatibility
  const code = `navigator.clipboard.writeText(${JSON.stringify(text)}).then(() => true).catch(() => false);`;
  try {
    const results = await API.scripting.executeScript({
      target: { tabId },
      func: (t) => navigator.clipboard.writeText(t).then(() => true).catch(() => false),
      args: [text]
    });
    const ok = results && results[0] && results[0].result;
    return !!ok;
  } catch (e) {
    return false;
  }
}

API.runtime.onInstalled && API.runtime.onInstalled.addListener(() => {
  createMenus();
});

API.contextMenus.onClicked.addListener(async (info, tab) => {
  if (!tab || !tab.id) return;
  const rawUrl = await getRelevantUrl(info, tab);
  if (!rawUrl) return;
  const { url } = canonicalize(rawUrl);
  if (info.menuItemId === "ali-clean") {
    await copyTextToClipboard(tab.id, url);
  } else if (info.menuItemId === "ali-shorten") {
    try {
      const shortUrl = await shortenWithIsGd(url);
      await copyTextToClipboard(tab.id, shortUrl);
    } catch (e) {
      await copyTextToClipboard(tab.id, url);
    }
  }
});