import { ref, onMounted } from "vue";
import { SUCCESS_CODE } from "@/constants/codes.constants.uts";
import { ACCESS_TOKEN } from "@/constants/home.constants";
import {
  apiCreateSubscriptionOrder,
  apiCreateCreditOrder,
  apiGetOrderCashier,
} from "@/subpackages/servers/subscription";
import { useI18n } from "@/utils/i18n";
import { API_BASE_URL } from "@/constants/config";
import { objectToQueryString } from "@/utils/common";

// 全局单例锁：记录已展示过 Toast 的 订单ID + 支付结果 映射，防止多组件重复提示
const alertedKeys = new Set<string>();

export function useSubscriptionPurchase() {
  const { t } = useI18n();
  const processingId = ref<number | null>(null);
  const loading = ref<boolean>(false);

  // #ifdef H5 || WEB
  const cleanUrlParams = () => {
    // 清空 window.location.search 中的参数
    const search = window.location.search;
    if (search !== "") {
      const params = new URLSearchParams(search);
      if (params.has("payResult") || params.has("orderId")) {
        params.delete("payResult");
        params.delete("orderId");
        const searchStr = params.toString();
        const newSearch = searchStr ? `?${searchStr}` : "";
        const newUrl =
          window.location.pathname + newSearch + window.location.hash;
        window.history.replaceState(null, "", newUrl);
      }
    }

    // 清空 window.location.hash 中的参数
    const hash = window.location.hash;
    const qIndex = hash.indexOf("?");
    if (qIndex !== -1) {
      const pathPart = hash.substring(0, qIndex);
      const hashSearch = hash.substring(qIndex);
      const params = new URLSearchParams(hashSearch);
      if (params.has("payResult") || params.has("orderId")) {
        params.delete("payResult");
        params.delete("orderId");
        const searchStr = params.toString();
        const newHash = pathPart + (searchStr ? `?${searchStr}` : "");
        const newUrl =
          window.location.pathname + window.location.search + newHash;
        window.history.replaceState(null, "", newUrl);
      }
    }
  };

  const checkPayResult = () => {
    const hash = window.location.hash;
    const search = window.location.search;

    let payResult = "";
    let orderId = "";

    // 优先从 main search 中解析
    if (search !== "") {
      const searchParams = new URLSearchParams(search);
      payResult = searchParams.get("payResult") || "";
      orderId = searchParams.get("orderId") || "";
    }

    // 若无，从 hash search 中解析
    if (payResult === "") {
      const qIndex = hash.indexOf("?");
      if (qIndex !== -1) {
        const hashSearch = hash.substring(qIndex);
        const hashParams = new URLSearchParams(hashSearch);
        payResult = hashParams.get("payResult") || "";
        orderId = hashParams.get("orderId") || "";
      }
    }

    if (payResult !== "") {
      const alertKey = `${orderId}_${payResult}`;
      if (alertedKeys.has(alertKey)) return;
      alertedKeys.add(alertKey);

      if (payResult === "success") {
        uni.showToast({
          title: t("Mobile.MySubscriptions.paySuccess"),
          icon: "success",
        });
      } else if (payResult === "failed") {
        uni.showToast({
          title: t("Mobile.MySubscriptions.payFailed"),
          icon: "none",
        });
      } else if (payResult === "pending") {
        uni.showToast({
          title: t("Mobile.MySubscriptions.payPending"),
          icon: "none",
        });
      }

      // 清除 URL 参数
      cleanUrlParams();
    }
  };
  // #endif

  onMounted(() => {
    // #ifdef H5 || WEB
    checkPayResult();
    // #endif
  });

  const getCashierUrlAndRedirect = async (orderId: number) => {
    loading.value = true;
    try {
      let settlementUrl = "";
      // #ifdef H5 || WEB
      const token = (uni.getStorageSync(ACCESS_TOKEN) as string) || "";
      let settlementOrigin = "";
      const hostname = window.location.hostname;
      if (hostname === "localhost" || hostname === "127.0.0.1") {
        settlementOrigin = "http://localhost:3000";
        settlementUrl = `${settlementOrigin}/static/payment-settlement.html?orderId=${orderId}&returnUrl=${encodeURIComponent(window.location.href)}&token=${encodeURIComponent(token)}`;
      } else {
        settlementOrigin = window.location.origin;
        settlementUrl = `${settlementOrigin}/static/payment-settlement.html?orderId=${orderId}&returnUrl=${encodeURIComponent(window.location.href)}`;
      }
      // #endif

      // #ifndef H5 || WEB
      const token = (uni.getStorageSync(ACCESS_TOKEN) as string) || "";
      const pages = getCurrentPages();
      let relativePath = "";
      if (pages.length > 0) {
        const currentPage = pages[pages.length - 1];
        const path = currentPage.route;
        const params = objectToQueryString(currentPage.options);
        relativePath = params !== "" ? `${path}?${params}` : path;
      }
      let baseSettlementUrl = API_BASE_URL;
      if (process.env.NODE_ENV === "development") {
        baseSettlementUrl = "http://localhost:3000";
      }
      const h5CurrentPageUrl = `${baseSettlementUrl}/m/#/${relativePath}`;
      settlementUrl = `${baseSettlementUrl}/static/payment-settlement.html?orderId=${orderId}&returnUrl=${encodeURIComponent(h5CurrentPageUrl)}&token=${encodeURIComponent(token)}&isMp=1`;
      // #endif

      // 获取收银台地址
      const cashierRes = await apiGetOrderCashier(
        orderId,
        settlementUrl !== "" ? settlementUrl : undefined,
      );
      if (cashierRes.code === SUCCESS_CODE && cashierRes.data != null) {
        const cashierInfo = cashierRes.data!;

        // #ifdef H5 || WEB
        // H5 环境直接重定向跳转到收银台
        window.location.href = cashierInfo.cashierUrl;
        // #endif

        // #ifndef H5 || WEB
        // 非 H5 环境（如 App 或 小程序）则打开内嵌 WebView 进行支付
        uni.navigateTo({
          url: `/subpackages/pages/webview/webview?url=${encodeURIComponent(cashierInfo.cashierUrl)}`,
        });
        // #endif
      } else {
        uni.showToast({
          title: t("Mobile.MySubscriptions.orderIdNotFound"),
          icon: "none",
        });
      }
    } catch (e) {
      uni.showToast({
        title: t("Mobile.MySubscriptions.loadFailed"),
        icon: "none",
      });
    } finally {
      loading.value = false;
      processingId.value = null;
    }
  };

  const handlePaySubscription = async (planId: number) => {
    if (processingId.value != null) return;
    processingId.value = planId;
    try {
      const orderRes = await apiCreateSubscriptionOrder(planId);
      if (orderRes.code === SUCCESS_CODE && orderRes.data) {
        const orderId = orderRes.data.id ?? orderRes.data;
        await getCashierUrlAndRedirect(orderId as number);
      } else {
        uni.showToast({
          title: t("Mobile.MySubscriptions.orderIdNotFound"),
          icon: "none",
        });
        processingId.value = null;
      }
    } catch (e) {
      uni.showToast({
        title: t("Mobile.MySubscriptions.loadFailed"),
        icon: "none",
      });
      processingId.value = null;
    }
  };

  const handlePayCredits = async (packageId: number) => {
    if (processingId.value != null) return;
    processingId.value = packageId;
    try {
      const orderRes = await apiCreateCreditOrder(packageId);
      if (orderRes.code === SUCCESS_CODE && orderRes.data) {
        const orderId = orderRes.data.id ?? orderRes.data;
        await getCashierUrlAndRedirect(orderId as number);
      } else {
        uni.showToast({
          title: t("Mobile.MySubscriptions.orderIdNotFound"),
          icon: "none",
        });
        processingId.value = null;
      }
    } catch (e) {
      uni.showToast({
        title: t("Mobile.MySubscriptions.loadFailed"),
        icon: "none",
      });
      processingId.value = null;
    }
  };

  return {
    processingId,
    loading,
    handlePaySubscription,
    handlePayCredits,
  };
}