/**
 * 支付客户端 - 封装支付 API 调用
 * 用于前端发起支付、跳转支付页
 */

import { getPaymentConfig, getJoinPaymentConfig } from "@/config/services.config";
import type { PayChannel, PayEnv } from "./types";

/** 发起支付并跳转（表单 POST 到 /api/pay） */
export function redirectToPay(params: {
  user_id: string;
  return_url: string;
  total_fee?: number;
  type?: string;
  channel: PayChannel;
  device: "pc" | "h5" | "wechat";
  /** 是否使用「加入」场景配置（主题覆盖） */
  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();
}

/** 根据 PayEnv 确定 device：微信内用 wechat 走收银台表单，payurl2 仅支持微信外 */
export function getDeviceFromEnv(env: PayEnv): "pc" | "h5" | "wechat" {
  if (env === "wechat") return "wechat";
  return env === "pc" ? "pc" : "h5";
}