import { getPaymentConfig, getJoinPaymentConfig } from "@/config/services.config";

export type PayChannel = "wxpay" | "alipay";

const ORDER_COOKIE = "join_pay_order";

function savePendingOrder(orderId: string): void {
  if (typeof document === "undefined") return;
  try {
    const v = `${orderId}|${Date.now()}`;
    document.cookie = `${ORDER_COOKIE}=${encodeURIComponent(v)}; path=/; max-age=900`;
    localStorage.setItem(ORDER_COOKIE, v);
  } catch {}
}

/** 同步表单 POST，用于 PC 和微信内（微信内避免异步 fetch 导致手势失效） */
export function redirectToPay(params: {
  user_id: string;
  return_url: string;
  total_fee?: number;
  type?: string;
  channel: PayChannel;
  device: "pc" | "h5" | "wechat";
  useJoinConfig?: boolean;
}): void {
  const baseConfig = getPaymentConfig();
  const joinConfig = params.useJoinConfig ? getJoinPaymentConfig() : null;
  const total_fee = params.total_fee ?? joinConfig?.amount ?? baseConfig.defaultAmount;
  const type = params.type ?? joinConfig?.type ?? baseConfig.defaultType;

  const payForm = document.createElement("form");
  payForm.method = "POST";
  payForm.action = "/api/pay";
  payForm.target = "_self";
  payForm.style.display = "none";

  const fields: [string, string][] = [
    ["user_id", params.user_id],
    ["return_url", params.return_url],
    ["total_fee", String(total_fee)],
    ["type", type],
    ["channel", params.channel],
    ["device", params.device],
    ["html", "1"],
  ];

  fields.forEach(([k, v]) => {
    const input = document.createElement("input");
    input.type = "hidden";
    input.name = k;
    input.value = v;
    payForm.appendChild(input);
  });

  document.body.appendChild(payForm);
  payForm.submit();
}

/** 微信内：同步表单 POST 到 /api/pay，避免异步 fetch 后 form.submit 被微信拦截（参考 nomadvip） */
export function payWechatXorpaySync(params: {
  user_id: string;
  return_url: string;
  total_fee?: number;
  type?: string;
  channel: PayChannel;
  useJoinConfig?: boolean;
}): void {
  const baseConfig = getPaymentConfig();
  const joinConfig = params.useJoinConfig ? getJoinPaymentConfig() : null;
  const total_fee = params.total_fee ?? joinConfig?.amount ?? baseConfig.defaultAmount;
  const type = params.type ?? joinConfig?.type ?? baseConfig.defaultType;

  const payForm = document.createElement("form");
  payForm.method = "POST";
  payForm.action = "/api/pay";
  payForm.target = "_self";
  payForm.style.display = "none";

  const fields: [string, string][] = [
    ["user_id", params.user_id],
    ["return_url", params.return_url],
    ["total_fee", String(total_fee)],
    ["type", type],
    ["channel", params.channel],
    ["device", "wechat"],
    ["html", "1"],
  ];

  fields.forEach(([k, v]) => {
    const input = document.createElement("input");
    input.type = "hidden";
    input.name = k;
    input.value = v;
    payForm.appendChild(input);
  });

  document.body.appendChild(payForm);
  payForm.submit();
}

/** 手机浏览器 H5：异步 fetch 获取 redirect_url 后跳转，支持 ZPAY 微信 H5 唤醒（参考 nomadvip + payjsapi） */
export async function redirectToPayH5(params: {
  user_id: string;
  return_url: string;
  total_fee?: number;
  type?: string;
  channel: PayChannel;
  useJoinConfig?: boolean;
}): Promise<void> {
  const baseConfig = getPaymentConfig();
  const joinConfig = params.useJoinConfig ? getJoinPaymentConfig() : null;
  const total_fee = params.total_fee ?? joinConfig?.amount ?? baseConfig.defaultAmount;
  const type = params.type ?? joinConfig?.type ?? baseConfig.defaultType;

  const controller = new AbortController();
  const timeoutId = setTimeout(() => controller.abort(), 28000);
  const res = await fetch("/api/pay", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      user_id: params.user_id,
      return_url: params.return_url,
      total_fee,
      type,
      channel: params.channel,
      device: "h5",
      html: "0",
    }),
    redirect: "manual",
    signal: controller.signal,
  }).finally(() => clearTimeout(timeoutId));

  if (res.status >= 301 && res.status <= 308) {
    const location = res.headers.get("location");
    if (location) {
      const orderId = res.headers.get("x-pay-order-id")?.trim();
      if (orderId) savePendingOrder(orderId);
      window.location.href = location;
      return;
    }
  }

  const data = await res.json().catch(() => ({}));
  if (!data?.ok) {
    alert(data?.error || "支付发起失败");
    return;
  }
  if (data?.order_id) savePendingOrder(data.order_id);
  if (data?.redirect_url) {
    window.location.href = data.redirect_url;
    return;
  }
  if (data?.params && data?.payUrl) {
    const form = document.createElement("form");
    form.method = "POST";
    form.action = data.payUrl;
    form.target = "_self";
    form.style.display = "none";
    for (const [k, v] of Object.entries(data.params as Record<string, string>)) {
      if (v == null) continue;
      const input = document.createElement("input");
      input.type = "hidden";
      input.name = k;
      input.value = String(v);
      form.appendChild(input);
    }
    document.body.appendChild(form);
    form.submit();
    return;
  }
  alert("支付发起失败");
}

export function getDeviceFromEnv(env: "pc" | "h5" | "wechat"): "pc" | "h5" | "wechat" {
  if (env === "wechat") return "wechat";
  return env === "pc" ? "pc" : "h5";
}