/**
 * Unified cashier: renders the gateway result returned by PaymentOrchestrator::pay().
 *
 * mode=qrcode   on-site QR modal (+ optional mobile deep link)
 * mode=redirect same-tab navigation to the gateway page
 * mode=form     auto-submit the server-built POST form
 * mode=jsapi    WeChat in-app WeixinJSBridge payment
 *
 * Polling stays with the caller (AksrtVipPurchaseCoordinator.poll); this module
 * only presents the payment step and reports when the QR modal is dismissed.
 *
 * @package AKSRT
 */
(function (window, document) {
  "use strict";

  var KIND = "pay-cashier";
  var sequence = 0;
  var listeners = Object.create(null);

  function escapeHtml(value) {
    return String(value == null ? "" : value).replace(/[&<>"']/g, function (ch) {
      return { "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[ch];
    });
  }

  function isMobile() {
    return /Android|iPhone|iPad|iPod|Mobile/i.test(window.navigator.userAgent || "");
  }

  function qrDataUrl(text) {
    if (typeof window.qrcode !== "function" || !text) return "";
    try {
      var qr = window.qrcode(0, "M");
      qr.addData(String(text));
      qr.make();
      return qr.createDataURL(6, 12);
    } catch (error) {
      return "";
    }
  }

  function amountText(data) {
    if (data.amount === undefined || data.amount === null || data.amount === "") return "";
    var mark = (window._win && window._win.pay_mark) || "￥";
    return mark + String(data.amount);
  }

  /** Inner QR markup; reusable by callers that own their own modal. */
  function qrHtml(data) {
    var src = qrDataUrl(data.code_url);
    var html = '<div class="aksrt-pay-cashier">';
    var amount = amountText(data);
    if (amount) html += '<div class="aksrt-pay-cashier__amount">' + escapeHtml(amount) + "</div>";
    html += src
      ? '<img class="aksrt-pay-cashier__qr" src="' + src + '" width="200" height="200" alt="支付二维码">'
      : '<p class="aksrt-pay-cashier__error">二维码组件未加载，请刷新页面重试。</p>';
    html += '<p class="aksrt-pay-cashier__tip">' + escapeHtml(data.message || "请使用手机扫码完成支付") + "</p>";
    if (data.payment_url && isMobile()) {
      html += '<a class="but jb-blue aksrt-pay-cashier__open" href="' + escapeHtml(data.payment_url) + '">打开支付应用</a>';
    }
    if (data.order_number) {
      html += '<p class="aksrt-pay-cashier__order muted-2-color em09">订单号：' + escapeHtml(data.order_number) + "</p>";
    }
    return html + "</div>";
  }

  function openQr(data, options) {
    var runtime = window.AksrtModalRuntime;
    if (!runtime) return false;
    var id = String(++sequence);
    if (typeof options.onClose === "function") listeners[id] = options.onClose;
    runtime.open({
      kind: KIND,
      cashierId: id,
      title: options.title || "扫码支付",
      className: "aksrt-pay-cashier-modal",
      telemetry: false,
      html: qrHtml(data),
    });
    return true;
  }

  function submitForm(html) {
    var host = document.createElement("div");
    host.hidden = true;
    host.innerHTML = String(html || "");
    var form = host.querySelector("form");
    if (!form) return false;
    document.body.appendChild(host);
    form.submit();
    return true;
  }

  function invokeJsapi(params, options) {
    var run = function () {
      window.WeixinJSBridge.invoke("getBrandWCPayRequest", params, function (res) {
        var msg = res && res.err_msg ? String(res.err_msg) : "";
        if (msg === "get_brand_wcpay_request:ok") return;
        if (typeof options.onClose === "function") {
          options.onClose(msg === "get_brand_wcpay_request:cancel" ? "cancel" : "error");
        }
      });
    };
    if (window.WeixinJSBridge && typeof window.WeixinJSBridge.invoke === "function") {
      run();
    } else {
      document.addEventListener("WeixinJSBridgeReady", run, { once: true });
    }
    return true;
  }

  /**
   * Present a pending payment. Returns the handled mode, or "" when the
   * payload carries no cashier step (synchronous gateways).
   *
   * options.onClose(reason) fires when the QR modal is dismissed or the
   * JSAPI sheet is cancelled; callers stop polling there.
   */
  function handle(data, options) {
    data = data || {};
    options = options || {};
    switch (data.mode) {
      case "qrcode":
        return data.code_url && openQr(data, options) ? "qrcode" : "";
      case "redirect":
        if (!data.payment_url) return "";
        window.location.assign(data.payment_url);
        return "redirect";
      case "form":
        return submitForm(data.form_html) ? "form" : "";
      case "jsapi":
        return data.jsapi_params ? invokeJsapi(data.jsapi_params, options) && "jsapi" : "";
      default:
        return "";
    }
  }

  /** Close the cashier QR modal after a terminal poll result. */
  function close() {
    var runtime = window.AksrtModalRuntime;
    var shell = runtime ? runtime.getActive() : null;
    if (shell && shell.classList.contains("aksrt-pay-cashier-modal")) runtime.close("paid");
  }

  document.addEventListener("aksrt:modal:close", function (event) {
    var detail = event && event.detail ? event.detail : {};
    var opts = detail.session && detail.session.options ? detail.session.options : {};
    if (opts.kind !== KIND || !listeners[opts.cashierId]) return;
    var fn = listeners[opts.cashierId];
    delete listeners[opts.cashierId];
    if (detail.reason !== "paid") fn(detail.reason || "close");
  });

  window.AksrtPayCashier = {
    KIND: KIND,
    handle: handle,
    close: close,
    qrHtml: qrHtml,
    isPending: function (data) { return !!(data && data.mode); },
  };
})(window, document);