(function () {
  var mask = document.getElementById("downloadAppDialog");
  if (!mask) return;

  var pcQRBox = mask.querySelector("[data-download-qr-box]");
  var h5QRBox = null;
  var h5URLEl = mask.querySelector("[data-download-url]");
  var downloadCTA = mask.querySelector("[data-download-app-cta]");
  var copyBtn = mask.querySelector("[data-download-copy]");
  var platformBtns = mask.querySelectorAll("[data-download-platform]");
  var copyTimer = null;
  var qrReady = false;
  var qrcodeLoading = null;

  function loadQRCodeLib() {
    if (typeof window.QRCode === "function") {
      return Promise.resolve();
    }
    if (qrcodeLoading) return qrcodeLoading;
    qrcodeLoading = new Promise(function (resolve, reject) {
      var s = document.createElement("script");
      s.src = "/static/common/qrcode.min.js";
      s.async = true;
      s.onload = function () { resolve(); };
      s.onerror = function () { reject(new Error("qrcode load failed")); };
      document.head.appendChild(s);
    });
    return qrcodeLoading;
  }

  function getAppConfig() {
    return window.__APP_CONFIG__ || {};
  }

  /** 二维码、跳转和复制链接统一使用 config/info.newAddressInfo.appAddr。 */
  function getAppURL() {
    var cfg = getAppConfig();
    var fromCfg = String((cfg && cfg.appAddr) || "").trim();
    if (fromCfg) return fromCfg;
    return String(mask.getAttribute("data-download-app-url") || "").trim();
  }

  function isHTTPURL(value) {
    return /^https?:\/\//i.test(String(value || "").trim());
  }

  function isMobileViewport() {
    return typeof window.matchMedia === "function"
      ? window.matchMedia("(max-width: 767px)").matches
      : (window.innerWidth || 0) <= 767;
  }

  function qrLevels() {
    var QR = window.QRCode;
    if (QR && QR.CorrectLevel) {
      return [QR.CorrectLevel.L, QR.CorrectLevel.M, QR.CorrectLevel.Q, QR.CorrectLevel.H];
    }
    return [1, 0, 3, 2];
  }

  function paintQRModel(model, size) {
    if (!model || typeof model.getModuleCount !== "function") return null;
    var n = model.getModuleCount();
    if (!n) return null;
    var canvas = document.createElement("canvas");
    canvas.width = size;
    canvas.height = size;
    var ctx = canvas.getContext("2d");
    if (!ctx) return null;
    ctx.fillStyle = "#ffffff";
    ctx.fillRect(0, 0, size, size);
    var cell = size / n;
    ctx.fillStyle = "#000000";
    for (var row = 0; row < n; row++) {
      for (var col = 0; col < n; col++) {
        if (model.isDark(row, col)) {
          ctx.fillRect(
            Math.floor(col * cell),
            Math.floor(row * cell),
            Math.ceil(cell),
            Math.ceil(cell)
          );
        }
      }
    }
    return canvas;
  }

  function encodeQRCanvas(text, size) {
    var QR = window.QRCode;
    if (typeof QR !== "function") return null;
    var holder = document.createElement("div");
    holder.style.cssText =
      "position:fixed;left:0;top:0;width:" +
      size +
      "px;height:" +
      size +
      "px;opacity:0;pointer-events:none;z-index:-1;";
    document.body.appendChild(holder);
    var levels = qrLevels();
    try {
      for (var i = 0; i < levels.length; i++) {
        holder.innerHTML = "";
        try {
          var inst = new QR(holder, {
            text: text,
            width: size,
            height: size,
            colorDark: "#000000",
            colorLight: "#ffffff",
            correctLevel: levels[i],
          });
          var painted = paintQRModel(inst && inst._oQRCode, size);
          if (painted) return painted;
          var srcCanvas = holder.querySelector("canvas");
          if (srcCanvas) {
            var copy = document.createElement("canvas");
            copy.width = size;
            copy.height = size;
            copy.getContext("2d").drawImage(srcCanvas, 0, 0, size, size);
            return copy;
          }
        } catch (e) {
          /* try next level */
        }
      }
      return null;
    } finally {
      if (holder.parentNode) holder.parentNode.removeChild(holder);
    }
  }

  function renderQR(el, text, size) {
    if (!el || !text) return false;
    el.innerHTML = "";
    var img = document.createElement("img");
    img.alt = "下载二维码";
    img.title = "黄果短剧 App 下载二维码";
    img.width = size;
    img.height = size;
    var canvas = encodeQRCanvas(text, size);
    if (canvas) {
      try {
        img.src = canvas.toDataURL("image/png");
        el.appendChild(img);
        return true;
      } catch (e) {
        el.appendChild(canvas);
        return true;
      }
    }
    img.src =
      "https://api.qrserver.com/v1/create-qr-code/?size=" +
      size +
      "x" +
      size +
      "&margin=0&data=" +
      encodeURIComponent(text);
    el.appendChild(img);
    return true;
  }

  function syncDownloadUI(force) {
    var url = getAppURL();
    if (!url) return;

    if (force || !qrReady) {
      var pcOk = renderQR(pcQRBox, url, 164);
      var h5Ok = renderQR(h5QRBox, url, 164);
      qrReady = !!(pcOk || h5Ok);
    }

    if (h5URLEl) {
      h5URLEl.textContent = "官方网址 " + url;
      if (isHTTPURL(url)) {
        h5URLEl.href = url;
        h5URLEl.removeAttribute("aria-disabled");
      } else {
        h5URLEl.href = "#";
        h5URLEl.setAttribute("aria-disabled", "true");
      }
    }
    if (downloadCTA) {
      downloadCTA.href = isHTTPURL(url) ? url : "#";
      downloadCTA.toggleAttribute("aria-disabled", !isHTTPURL(url));
    }
  }

  function openDialog(event) {
    if (event) event.preventDefault();
    mask.classList.add("is-open");
    document.body.style.overflow = "hidden";
    loadQRCodeLib()
      .catch(function () { /* fallback image QR still works */ })
      .then(function () {
        requestAnimationFrame(function () {
          requestAnimationFrame(function () {
            syncDownloadUI(true);
          });
        });
      });
  }

  function closeDialog() {
    mask.classList.remove("is-open");
    document.body.style.overflow = "";
  }

  function setPlatform(platform) {
    if (platform !== "ios" && platform !== "android") return;
    currentPlatform = platform;
    platformBtns.forEach(function (btn) {
      btn.classList.toggle(
        "is-active",
        btn.getAttribute("data-download-platform") === platform
      );
    });
    if (copyBtn) {
      copyBtn.textContent = "复制下载链接";
      copyBtn.classList.remove("is-copied");
    }
  }

  function copyLink() {
    var url = getAppURL();
    if (!url || !copyBtn) return;

    function onSuccess() {
      copyBtn.textContent = "已复制";
      copyBtn.classList.add("is-copied");
      if (copyTimer) clearTimeout(copyTimer);
      copyTimer = setTimeout(function () {
        copyBtn.textContent = "复制下载链接";
        copyBtn.classList.remove("is-copied");
      }, 1800);
    }

    if (navigator.clipboard && navigator.clipboard.writeText) {
      navigator.clipboard.writeText(url).then(onSuccess).catch(function () {
        fallbackCopy(url, onSuccess);
      });
      return;
    }
    fallbackCopy(url, onSuccess);
  }

  function fallbackCopy(text, onSuccess) {
    var input = document.createElement("input");
    input.value = text;
    input.setAttribute("readonly", "");
    input.style.position = "fixed";
    input.style.left = "-9999px";
    document.body.appendChild(input);
    input.select();
    try {
      document.execCommand("copy");
      onSuccess();
    } catch (e) {
      /* ignore */
    }
    document.body.removeChild(input);
  }

  document.addEventListener("click", function (event) {
    var openTrigger = event.target.closest("[data-download-app-open]");
    if (openTrigger) {
      // 移动端由带 appAddr 的原生链接直接跳转，不展示二维码弹窗。
      if (isMobileViewport()) return;
      openDialog(event);
      return;
    }

    if (event.target.closest("[data-download-app-close]")) {
      closeDialog();
      return;
    }

    if (event.target === mask) {
      closeDialog();
      return;
    }

    var platformBtn = event.target.closest("[data-download-platform]");
    if (platformBtn && mask.contains(platformBtn)) {
      setPlatform(platformBtn.getAttribute("data-download-platform"));
      return;
    }

    if (event.target.closest("[data-download-copy]")) {
      copyLink();
    }
  });

  document.addEventListener("keydown", function (event) {
    if (event.key === "Escape" && mask.classList.contains("is-open")) {
      closeDialog();
    }
  });

  window.openDownloadAppDialog = openDialog;
  window.closeDownloadAppDialog = closeDialog;
})();