// #ifdef APP-PLUS
import { initDypay, canOpenDypay, openDypay, resetDypay } from '@/uni_modules/tb-douyin-pay';
// #endif
import request from './request.js';
import { BASE_URL } from './config.js';
import { TOKEN_NAME, USER_DATA } from './auth.js';
import { toSdkPayInfo, queryUntilSettled } from './douyin-pay-adapter.mjs';

let active = false;
let resuming = false;
function accountKey() {
  if (!uni.getStorageSync(TOKEN_NAME)) return '';
  const user = uni.getStorageSync(USER_DATA) || {};
  const id = user.userId || user.id;
  return id ? `tb-douyin:${BASE_URL}:${id}` : '';
}
async function query(orderNum) {
  return queryUntilSettled(async options => {
    const response = await request({ ...options, isShowLoading: false, timeout: 30000 });
    if (response?.bizcode !== 100) throw new Error('查询支付结果失败');
    return response.data;
  }, orderNum);
}

export function douyinPayTypes(types) {
  // #ifdef H5
  return types.split(',').includes('6') ? types : `${types},6`;
  // #endif
  // #ifdef APP-PLUS
  return types.split(',').includes('6') ? types : `${types},6`;
  // #endif
  // #ifndef APP-PLUS
  return types;
  // #endif
}
export function filterDouyinPayWays(ways) {
  // #ifdef H5
  return ways || [];
  // #endif
  // #ifdef APP-PLUS
  return ways || [];
  // #endif
  // #ifndef APP-PLUS
  return (ways || []).filter(item => item.type !== 'douyin');
  // #endif
}
function showState(state, key, orderNum) {
  if (key !== accountKey()) return;
  if (state.state !== 'pending' && uni.getStorageSync(key) === orderNum) uni.removeStorageSync(key);
  uni.$emit('douyin-payment-result', { orderNum, state: state.state });
  uni.showToast({ title: state.state === 'paid' ? '支付成功' : state.state === 'failed'
    ? '支付未成功，请查看订单' : state.state === 'closed' ? '原支付已关闭，可重新下单'
    : state.message || '支付结果待确认，请稍后查看订单', icon: 'none', duration: 2500 });
}

// Called only by a user payment action, never by onShow. Renew the SAME transaction on the server.
async function continuePendingPayment(key, orderNum) {
  const response = await request({ url: '/payment/douyin/resume', method: 'POST',
    data: { orderNum }, isShowLoading: false, timeout: 60000 });
  if (key !== accountKey()) return { state: 'pending' };
  if (response?.bizcode !== 100) throw new Error('暂时无法续付，请查看订单后重试');
  const result = response.data;
  if (!result || result.orderNum !== orderNum) throw new Error('续付订单不匹配，请查看订单');
  if (result.state === 'paid' || result.state === 'closed') {
    // The existing query endpoint also reconciles business orders when a webhook was missed.
    const state = result.state === 'paid' ? await query(orderNum) : { state: 'closed' };
    if (key === accountKey() && state.state !== 'pending') resetDypay();
    showState(state, key, orderNum);
    return state;
  }
  if (result.state !== 'unpaid') {
    const messages = {
      QUERY_FAILED: '抖音查单失败，暂不能重新支付，请稍后重试',
      CLOSE_UNCONFIRMED: '旧支付关单尚未确认，请稍后重试',
      RECONCILIATION_REQUIRED: '订单状态需核对，请联系客服，勿重复付款',
      CHANNEL_PENDING: '抖音支付处理中，请稍后查看订单'
    };
    const state = { state: 'pending', message: messages[result.reason] };
    showState(state, key, orderNum);
    return state;
  }
  if (result.payment?.orderNum !== orderNum) throw new Error('续付订单不匹配，请查看订单');
  // Validate before the confirmation dialog. Never store the SDK signature locally.
  toSdkPayInfo(result.payment);
  resetDypay();
  const confirmed = await new Promise(resolve => uni.showModal({
    title: '继续上一笔支付',
    content: `上一笔抖音支付尚未完成，是否继续支付原订单？${result.payment.amount != null
      ? `金额：¥${result.payment.amount}。` : ''}不会创建新订单。`,
    confirmText: '继续支付', cancelText: '暂不支付',
    success: res => resolve(res.confirm === true), fail: () => resolve(false)
  }));
  if (!confirmed || key !== accountKey()) return { state: 'pending' };
  return executePayment(result.payment, key);
}

async function executePayment(payment, key) {
  // #ifdef APP-PLUS
  if (key !== accountKey()) return { state: 'pending' };
  const payInfo = toSdkPayInfo(payment);
  if (!canOpenDypay()) throw new Error('请先安装或升级抖音客户端');
  if (!initDypay({ appId: payInfo.appid, callbackScheme: payment.douyin.callbackScheme || 'trustbridgeapp' })) {
    throw new Error('支付初始化失败，请稍后重试');
  }
  // Persist before entering native code so a killed process remains recoverable.
  uni.setStorageSync(key, payment.orderNum);
  const nativeResult = await new Promise(resolve => openDypay({ payInfo, showLoading: true }, resolve));
  const state = await query(payment.orderNum);
  if (state.state === 'pending' && nativeResult?.resultCode && !['0', '3'].includes(String(nativeResult.resultCode))) {
    // A native error is diagnostic only: never clear a potentially live payment on its authority.
    const descriptions = { '1': '支付已取消', '2': '支付 SDK 调用失败', '100': '请安装或升级抖音客户端',
      '103': '原生支付仍在处理中', '-1': '支付参数校验失败' };
    state.message = `${descriptions[String(nativeResult.resultCode)] || '支付未完成'}，请查询订单后重试`;
  }
  showState(state, key, payment.orderNum);
  return state;
  // #endif
}

// Runs BEFORE creating an order. A pending record offers explicit continuation, not a new order.
export async function prepareDouyinPay(payway) {
  if (payway !== 'douyin') return true;
  try {
    // #ifndef APP-PLUS
    throw new Error('抖音支付仅支持 Android/iOS App');
    // #endif
    // #ifdef APP-PLUS
    if (active || resuming) throw new Error('正在处理支付，请勿重复点击');
    const key = accountKey();
    if (!key) throw new Error('请先登录后再支付');
    const previous = uni.getStorageSync(key);
    if (previous) {
      resuming = true;
      try {
        const result = await continuePendingPayment(key, previous);
        if (result.state !== 'closed' || key !== accountKey() || uni.getStorageSync(key)) return false;
        const confirmed = await new Promise(resolve => uni.showModal({
          title: '原支付已关闭',
          content: '上一笔支付已确认关闭。是否按当前页面重新发起支付？原商品订单若已过期，请返回商品页重新下单。',
          confirmText: '重新支付', cancelText: '暂不支付',
          success: res => resolve(res.confirm === true), fail: () => resolve(false)
        }));
        if (!confirmed || key !== accountKey() || uni.getStorageSync(key)) return false;
        if (!canOpenDypay()) throw new Error('请先安装或升级抖音客户端');
        return true;
      }
      finally { resuming = false; }
    }
    if (!canOpenDypay()) throw new Error('请先安装或升级抖音客户端');
    return true;
    // #endif
  } catch (error) {
    uni.showToast({ title: error.message || '暂时无法支付，请稍后重试', icon: 'none' });
    return false;
  }
}

// Takes the existing settlement/recharge response; does NOT create a second order.
export async function appDypayFun(payment) {
  // #ifndef APP-PLUS
  uni.showToast({ title: '抖音支付仅支持 Android/iOS App', icon: 'none' });
  return;
  // #endif
  // #ifdef APP-PLUS
  if (active || resuming) return;
  active = true;
  const key = accountKey();
  try {
    if (!key || !payment.orderNum) throw new Error('登录身份或支付订单编号缺失');
    const previous = uni.getStorageSync(key);
    if (previous) {
      // Even legacy callers must not open a different payment while the saved one is unresolved.
      return await continuePendingPayment(key, previous);
    }
    return await executePayment(payment, key);
  } catch (error) {
    if (key === accountKey()) uni.showToast({ title: error.message || '支付结果待确认，请查看订单', icon: 'none' });
    return { state: 'error', message: error.message || '支付结果待确认，请查看订单' };
  } finally { active = false; }
  // #endif
}

export async function resumeDouyinPay() {
  // #ifdef APP-PLUS
  if (active || resuming) return;
  const key = accountKey();
  const pending = key && uni.getStorageSync(key);
  if (!pending) return;
  resuming = true;
  try {
    const state = await query(pending);
    if (key === accountKey() && state.state !== 'pending') resetDypay();
    showState(state, key, pending);
  }
  catch (_) { /* Keep the order for a later onShow. Never infer a payment failure. */ }
  finally { resuming = false; }
  // #endif
}