// #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';
import { jumpToPaymentSuccess, jumpToPaymentFailure } from './payment-navigation.js';

let active = false;
let resuming = false;
let inFlight = null;
let checkingForeground = false;
const failureShown = new Map();
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 APP-PLUS
  return types.split(',').includes('6') ? types : `${types},6`;
  // #endif
  // #ifndef APP-PLUS
  return types;
  // #endif
}
export function filterDouyinPayWays(ways) {
  // #ifdef APP-PLUS
  return ways || [];
  // #endif
  // #ifndef APP-PLUS
  return (ways || []).filter(item => item.type !== 'douyin');
  // #endif
}
async function showState(state, key, orderNum) {
  if (key !== accountKey()) return;
  if (state.state === 'paid') {
    const navigated = await jumpToPaymentSuccess();
    if (key !== accountKey()) return;
    if (!navigated) {
      // Retain the record so the next onShow/click can retry navigation without paying again.
      uni.showToast({ title: '支付成功，请在订单中查看', icon: 'none' });
      return;
    }
    failureShown.delete(key);
  } else {
    // Same failure page as WeChat/Alipay. Ending the UI attempt is not a channel close.
    // Keep unresolved orders for reconciliation, but do not push the page on every onShow.
    const alreadyShown = failureShown.get(key) === orderNum;
    if (!alreadyShown) {
      const navigated = await jumpToPaymentFailure();
      if (key !== accountKey()) return;
      if (!navigated) {
        uni.showToast({ title: '支付未完成，请查看订单', icon: 'none' });
        return;
      }
      failureShown.set(key, orderNum);
    } else if (state.state === 'pending') return;
  }
  if (state.state !== 'pending' && uni.getStorageSync(key) === orderNum) uni.removeStorageSync(key);
  uni.$emit('douyin-payment-result', { orderNum, state: state.state });
  if (state.state !== 'pending') return;
  uni.showToast({ title: state.message || '支付结果待确认，请稍后查看订单', icon: 'none', duration: 2500 });
}

// Only called when the CURRENT server response names the cached transaction.
// A payment click for another product must never authorize this old transaction.
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();
    await 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] };
    await 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');
  // The user's payment click already authorizes continuation. No additional modal.
  // Validate the original server parameters; never store the SDK signature locally.
  toSdkPayInfo(result.payment);
  resetDypay();
  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');
  // iOS must return to this installed host's registered Scheme. The previous
  // default Universal Link serves HTML instead of an Apple association file;
  // Dypay prioritizes that link over the working Scheme. Do not register it.
  const isIOS = uni.getSystemInfoSync().platform === 'ios';
  const callbackScheme = isIOS ? 'trustbridgeapp' : (payment.douyin?.callbackScheme || 'trustbridgeapp');
  if (!initDypay({ appId: payInfo.appid, callbackScheme })) {
    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.
  failureShown.delete(key);
  uni.setStorageSync(key, payment.orderNum);
  const session = { key, orderNum: payment.orderNum, settled: false, finish: null };
  inFlight = session;
  try {
    const nativeResult = await new Promise(resolve => {
      session.finish = result => {
        if (session.settled) return;
        session.settled = true;
        resolve(result);
      };
      openDypay({ payInfo, showLoading: true }, session.finish);
    });
    const state = nativeResult?.serverState || 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`;
    }
    await showState(state, key, payment.orderNum);
    return state;
  } finally { if (inFlight === session) inFlight = null; }
  // #endif
}

// Like WeChat/Alipay, let the current checkout/recharge/order-payment request
// choose the transaction. The account-wide recovery record is NOT that choice.
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');
    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 === payment.orderNum) {
      // An explicit retry of this same server-selected order still needs reconciliation.
      failureShown.delete(key);
      return await continuePendingPayment(key, payment.orderNum);
    }
    // Validate the CURRENT response before releasing any stale native callback.
    // This only resets the client bridge, not the previous server order. Its
    // settlement remains handled by backend callbacks/query jobs/order details.
    toSdkPayInfo(payment);
    if (previous) resetDypay();
    return await executePayment(payment, key);
  } catch (error) {
    if (key && key === accountKey()) {
      await showState({ state: 'pending', message: error.message || '支付结果待确认，请查看订单' }, key, payment?.orderNum || '');
    }
    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
  // The SDK callback may be lost when returning from Douyin. Reconcile onShow even
  // while native payment is waiting; only a terminal server result can finish it.
  const session = inFlight;
  if (session) {
    if (checkingForeground || session.settled || session.key !== accountKey()) return;
    checkingForeground = true;
    try {
      const state = await query(session.orderNum);
      if (session === inFlight && !session.settled && session.key === accountKey() && state.state !== 'pending') {
        resetDypay();
        session.finish({ serverState: state });
      }
    } catch (_) { /* A failed foreground query must not unlock a live transaction. */ }
    finally { checkingForeground = false; }
    return;
  }
  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();
    await showState(state, key, pending);
  }
  catch (_) {
    // The interrupted attempt uses the existing failure page, without marking the
    // server transaction failed or forgetting an order whose result is still unknown.
    await showState({ state: 'pending', message: '支付结果待确认，请稍后查看订单' }, key, pending);
  }
  finally { resuming = false; }
  // #endif
}