import Router from '@koa/router';
import { Context } from 'koa';
import * as PaymentService from './payment.service';
import { BadRequestError } from '../../middleware/errorHandler';
import { authMiddleware } from '../../middleware/auth';
import { prisma } from '../../models';
import { safeParseInt } from '../../utils/safe-parse';

const router = new Router();

// 创建支付订单
router.post('/create', authMiddleware, async (ctx: Context) => {
  const userId = safeParseInt(ctx.state.user.userId);
  const { planId, paymentMethod, period = 'monthly', returnUrl } = ctx.request.body as {
    planId: number;
    paymentMethod: 'alipay' | 'wechat' | 'mock';
    period?: 'monthly' | 'yearly';
    returnUrl?: string;
  };

  if (!planId) {
    throw new BadRequestError('请选择套餐');
  }

  if (!['alipay', 'wechat', 'mock'].includes(paymentMethod)) {
    throw new BadRequestError('请选择支付方式');
  }

  const result = await PaymentService.createPaymentOrder(userId, planId, paymentMethod, period, returnUrl);

  ctx.body = {
    code: 0,
    message: '订单创建成功',
    data: result
  };
});

// 创建 Token 包支付订单
router.post('/token-packs/create', authMiddleware, async (ctx: Context) => {
  const userId = safeParseInt(ctx.state.user.userId);
  const { quantity, paymentMethod, returnUrl } = ctx.request.body as {
    quantity: number;
    paymentMethod: 'alipay' | 'wechat' | 'mock';
    returnUrl?: string;
  };

  if (!quantity || quantity < 1) {
    throw new BadRequestError('购买数量至少为1');
  }

  if (!['alipay', 'wechat', 'mock'].includes(paymentMethod)) {
    throw new BadRequestError('请选择支付方式');
  }

  const result = await PaymentService.createTokenPackOrder(userId, quantity, paymentMethod, returnUrl);

  ctx.body = {
    code: 0,
    message: '订单创建成功',
    data: result
  };
});

// 模拟支付（仅开发环境）
router.post('/mock', authMiddleware, async (ctx: Context) => {
  if (process.env.NODE_ENV === 'production') {
    throw new BadRequestError('生产环境不可用');
  }

  const userId = safeParseInt(ctx.state.user.userId);
  const { orderNo } = ctx.request.body as { orderNo: string };

  if (!orderNo) {
    throw new BadRequestError('订单号不能为空');
  }

  const result = await PaymentService.mockPaymentSuccess(orderNo, userId);

  ctx.body = {
    code: 0,
    message: result.message,
    data: result
  };
});

// 支付宝异步通知回调
router.post('/alipay/notify', async (ctx: Context) => {
  const params = ctx.request.body as Record<string, string>;

  console.log('[Alipay Notify] 收到异步通知:', params);

  // 验证签名
  const signVerified = PaymentService.verifyAlipaySign(params);
  if (!signVerified) {
    console.error('[Alipay Notify] 签名验证失败');
    ctx.status = 400;
    ctx.body = 'fail';
    return;
  }

  const { out_trade_no, trade_status, trade_no } = params;

  try {
    if (trade_status === 'TRADE_SUCCESS' || trade_status === 'TRADE_FINISHED') {
      // 支付成功
      await PaymentService.handlePaymentCallback(out_trade_no, trade_no, 'success');
      console.log('[Alipay Notify] 订单支付成功:', out_trade_no);
      ctx.body = 'success';
    } else if (trade_status === 'WAIT_BUYER_PAY') {
      // 等待买家付款
      console.log('[Alipay Notify] 等待买家付款:', out_trade_no);
      ctx.body = 'success';
    } else {
      // 其他状态视为失败
      await PaymentService.handlePaymentCallback(out_trade_no, trade_no, 'failed');
      console.log('[Alipay Notify] 订单支付失败:', out_trade_no, trade_status);
      ctx.body = 'success';
    }
  } catch (error) {
    console.error('[Alipay Notify] 处理回调失败:', error);
    ctx.status = 500;
    ctx.body = 'fail';
  }
});

// 支付宝同步回调（用户从支付宝页面返回）
router.get('/alipay/return', async (ctx: Context) => {
  const params = ctx.query as Record<string, string>;

  console.log('[Alipay Return] 收到同步返回:', params);

  // 验证签名
  const signVerified = PaymentService.verifyAlipaySign(params);
  if (!signVerified) {
    console.error('[Alipay Return] 签名验证失败');
    // 重定向到支付结果页面（失败）
    const failUrl = `${process.env.ALIPAY_RETURN_URL || '/#/pages/payment-result/index'}?status=failed&error_msg=签名验证失败`;
    ctx.redirect(failUrl);
    return;
  }

  const { out_trade_no, trade_status } = params;

  // 根据支付状态重定向
  if (trade_status === 'TRADE_SUCCESS' || trade_status === 'TRADE_FINISHED') {
    // 支付成功
    const successUrl = `${process.env.ALIPAY_RETURN_URL || '/#/pages/payment-result/index'}?status=success&orderNo=${out_trade_no}&trade_status=${trade_status}`;
    ctx.redirect(successUrl);
  } else {
    // 支付未完成
    const failUrl = `${process.env.ALIPAY_RETURN_URL || '/#/pages/payment-result/index'}?status=failed&orderNo=${out_trade_no}`;
    ctx.redirect(failUrl);
  }
});

// 微信支付回调（V3 加密格式）
router.post('/wechat/notify', async (ctx: Context) => {
  try {
    const body = ctx.request.body as any;
    console.log('[WeChat Notify] 收到回调:', JSON.stringify(body));

    // WeChat V3 回调是加密的，需要先解密 resource.ciphertext
    const eventType = body.event_type;
    const decrypted = PaymentService.decryptWechatNotify(body);

    if (!decrypted) {
      console.error('[WeChat Notify] 回调解密失败，返回 500');
      ctx.status = 500;
      ctx.body = { code: 'FAIL', message: '解密失败' };
      return;
    }

    const { out_trade_no, transaction_id, trade_state } = decrypted;

    if (!out_trade_no) {
      console.error('[WeChat Notify] 解密后缺少 out_trade_no:', JSON.stringify(decrypted));
      ctx.status = 400;
      ctx.body = { code: 'FAIL', message: '缺少订单号' };
      return;
    }

    if (trade_state === 'SUCCESS') {
      await PaymentService.handlePaymentCallback(out_trade_no, transaction_id, 'success');
      console.log('[WeChat Notify] 订单支付成功:', out_trade_no);
    } else {
      await PaymentService.handlePaymentCallback(out_trade_no, transaction_id, 'failed');
      console.log('[WeChat Notify] 订单支付失败:', out_trade_no, trade_state);
    }

    ctx.body = { code: 'SUCCESS', message: '成功' };
  } catch (error) {
    console.error('[WeChat Notify] 处理回调失败:', error);
    ctx.status = 500;
    ctx.body = { code: 'FAIL', message: '处理失败' };
  }
});

// 查询微信支付订单状态
router.get('/wechat/query/:orderNo', authMiddleware, async (ctx: Context) => {
  const { orderNo } = ctx.params;

  const result = await PaymentService.queryWechatOrder(orderNo);

  if (!result) {
    ctx.body = {
      code: -1,
      message: '未配置微信支付或查询失败',
      data: null
    };
    return;
  }

  ctx.body = {
    code: 0,
    message: 'success',
    data: result
  };
});

// 获取订单列表
router.get('/orders', authMiddleware, async (ctx: Context) => {
  const userId = safeParseInt(ctx.state.user.userId);
  const { page = '1', pageSize = '20' } = ctx.query as { page?: string; pageSize?: string };

  const result = await PaymentService.getOrderList(
    userId,
    Number(page) || 1,
    Number(pageSize) || 20
  );

  ctx.body = {
    code: 0,
    message: 'success',
    data: result
  };
});

// 获取订单详情（含主动同步微信支付状态）
router.get('/orders/:orderNo', authMiddleware, async (ctx: Context) => {
  const userId = safeParseInt(ctx.state.user.userId);
  const { orderNo } = ctx.params;

  const result = await PaymentService.getOrderDetailWithSync(orderNo, userId);

  ctx.body = {
    code: 0,
    message: 'success',
    data: result
  };
});

// 生成支付宝扫码支付二维码
router.post('/alipay/qrcode', authMiddleware, async (ctx: Context) => {
  const userId = parseInt(ctx.state.user.userId);
  const { planId } = ctx.request.body as { planId: number };

  if (!planId) {
    throw new BadRequestError('请选择套餐');
  }

  // 获取套餐信息
  const plan = await prisma.subscriptionPlan.findUnique({
    where: { id: planId }
  });

  if (!plan) {
    throw new BadRequestError('套餐不存在');
  }

  // 生成订单
  const orderNo = PaymentService.generateOrderNo();
  const amount = Number(plan.priceMonthly);

  // 创建订单记录
  await prisma.order.create({
    data: {
      userId,
      orderNo,
      planId,
      productType: 'monthly',
      amount,
      status: 'pending',
      paymentMethod: 'alipay',
    }
  });

  // 生成支付二维码链接
  const qrcodeUrl = await PaymentService.generateAlipayQrcode(orderNo, amount, plan.name);

  ctx.body = {
    code: 0,
    message: 'success',
    data: {
      orderNo,
      amount,
      planName: plan.name,
      qrcode: qrcodeUrl
    }
  };
});

// ==================== 微信 JSAPI 支付（公众号内支付） ====================

// 🔍 微信支付配置诊断接口（一键排查所有常见配置问题）
router.get('/wechat/diagnose', async (ctx: Context) => {
  const issues: string[] = [];
  const checks: Record<string, any> = {};

  const fs = require('fs');
  const path = require('path');

  // 1. 检查环境变量
  const publicAppId = process.env.WECHAT_PUBLIC_APP_ID;
  const appId = process.env.WECHAT_APP_ID;
  const mchId = process.env.WECHAT_MCH_ID;
  const serialNo = process.env.WECHAT_SERIAL_NO;
  const apiv3Key = process.env.WECHAT_APIV3_KEY;
  const publicSecret = process.env.WECHAT_PUBLIC_APP_SECRET;
  const notifyUrl = process.env.WECHAT_NOTIFY_URL;

  checks['WECHAT_PUBLIC_APP_ID'] = publicAppId ? '✅' : '❌ 缺少（JSAPI必须用公众号appId）';
  checks['WECHAT_MCH_ID'] = mchId ? '✅' : '❌ 缺少商户号';
  checks['WECHAT_SERIAL_NO'] = serialNo ? '✅' : '❌ 缺少证书序列号';
  checks['WECHAT_APIV3_KEY'] = apiv3Key ? '✅' : '❌ 缺少APIv3密钥';
  checks['WECHAT_PUBLIC_APP_SECRET'] = publicSecret ? '✅' : '❌ 缺少（OAuth需要）';
  checks['WECHAT_NOTIFY_URL'] = notifyUrl ? '✅' : '❌ 缺少回调URL';

  // 2. 检查证书文件
  const certDir = path.join(__dirname, '../../../cert/wx');
  checks['证书目录'] = fs.existsSync(certDir) ? '✅' : '❌ 目录不存在';
  if (fs.existsSync(certDir)) {
    checks['apiclient_key.pem'] = fs.existsSync(path.join(certDir, 'apiclient_key.pem')) ? '✅' : '❌ 缺失';
    checks['pub_key.pem'] = fs.existsSync(path.join(certDir, 'pub_key.pem')) ? '✅' : '❌ 缺失（可能需要）';
  }

  // 3. 汇总问题
  if (!publicAppId) issues.push('缺少 WECHAT_PUBLIC_APP_ID（JSAPI支付必须用公众号appId）');
  if (!mchId) issues.push('缺少 WECHAT_MCH_ID');
  if (!apiv3Key) issues.push('缺少 WECHAT_APIV3_KEY');
  if (!serialNo) issues.push('缺少 WECHAT_SERIAL_NO');
  if (!publicSecret) issues.push('缺少 WECHAT_PUBLIC_APP_SECRET（OAuth授权获取openid必须）');

  // 4. 检查关键平台配置（需要人工确认的）
  const domain = process.env.BASE_URL || `https://${ctx.request.hostname}`;
  issues.push(`🔔 请人工确认：微信商户平台 → 产品中心 → 开发配置 → JSAPI 支付 → 支付授权目录 → 添加 "${domain}/"`);
  issues.push(`🔔 请人工确认：公众号后台 → 设置与开发 → 功能设置 → 网页授权域名 → 添加 "${new URL(domain).hostname}"`);

  ctx.body = {
    code: 0,
    message: issues.length ? `发现 ${issues.length} 个需要注意的项` : '配置正常',
    data: {
      checks,
      issues,
      tips: [
        '1. JSAPI 支付目录必须精确匹配页面 URL 前缀，建议直接配域名根目录',
        '2. 网页授权域名只需填域名（不带 http://），需上传验证文件到服务器',
        '3. IP白名单：微信商户平台 → 账户安全 → API安全 → 添加服务器出口IP',
        '4. timeStamp 必须是字符串类型（本代码已修复）',
      ]
    }
  };
});

// 生成微信 OAuth 授权链接（前端跳转到微信获取 code）
router.get('/wechat/oauth-url', async (ctx: Context) => {
  let { redirect } = ctx.query as { redirect?: string };
  // 修复HTML实体编码问题（Nginx或Koa可能把 / 编码成 &#x2F;）
  if (redirect) {
    redirect = redirect.replace(/&#x2F;|&#x2f;/gi, '/').replace(/&#x3A;|&#x3a;/gi, ':');
  }
  // OAuth授权必须使用公众号appId
  const appId = process.env.WECHAT_PUBLIC_APP_ID || process.env.WECHAT_APP_ID;

  if (!appId) {
    ctx.body = { code: -1, message: '未配置微信公众号', data: null };
    return;
  }

  // 构造 OAuth 授权链接
  // scope=snsapi_base 静默授权，不需要用户确认，但只能获取 openid
  const baseUrl = redirect || (process.env.BASE_URL || 'https://book.rrbrr.com');
  const redirectUri = encodeURIComponent(baseUrl);
  const state = Math.random().toString(36).substring(2, 10);
  const oauthUrl = `https://open.weixin.qq.com/connect/oauth2/authorize?appid=${appId}&redirect_uri=${redirectUri}&response_type=code&scope=snsapi_base&state=${state}#wechat_redirect`;
  
  console.log('[WeChat OAuth] 构造授权链接:', { appId, baseUrl, redirectUri: decodeURIComponent(redirectUri), oauthUrl });

  ctx.body = {
    code: 0,
    message: 'success',
    data: { oauthUrl, state }
  };
});

// 通过 OAuth code 获取 openid
router.post('/wechat/openid', async (ctx: Context) => {
  const { code } = ctx.request.body as { code: string };

  if (!code) {
    ctx.body = { code: -1, message: '授权码不能为空', data: null };
    return;
  }

  const openid = await PaymentService.getWechatOpenid(code);

  if (!openid) {
    ctx.body = { code: -1, message: '获取用户信息失败', data: null };
    return;
  }

  ctx.body = {
    code: 0,
    message: 'success',
    data: { openid }
  };
});

// 获取微信 JS-SDK 签名（用于 wx.config）
router.get('/wechat/jssdk-sign', async (ctx: Context) => {
  const { url } = ctx.query as { url?: string };
  
  if (!url) {
    ctx.body = { code: -1, message: '缺少url参数', data: null };
    return;
  }

  const signature = await PaymentService.generateJsSdkSignature(url);
  
  if (!signature) {
    ctx.body = { code: -1, message: '生成签名失败', data: null };
    return;
  }

  ctx.body = {
    code: 0,
    message: 'success',
    data: signature
  };
});

// 创建微信 JSAPI 支付订单（公众号内支付）
router.post('/wechat/jsapi', authMiddleware, async (ctx: Context) => {
  const userId = safeParseInt(ctx.state.user.userId);
  const rawBody = ctx.request.body as any;

  // ===== DEBUG: 完整请求日志 =====
  console.log('[JSAPI-DEBUG] ========== 收到JSAPI支付请求 ==========');
  console.log('[JSAPI-DEBUG] userId:', userId);
  console.log('[JSAPI-DEBUG] body keys:', Object.keys(rawBody));
  console.log('[JSAPI-DEBUG] body:', JSON.stringify(rawBody, null, 2));
  console.log('[JSAPI-DEBUG] headers:', JSON.stringify({
    'content-type': ctx.request.headers['content-type'],
    'user-agent': ctx.request.headers['user-agent'],
    'authorization': ctx.request.headers['authorization'] ? '***' : 'none',
  }));

  const { planId, productType, quantity, period = 'monthly', openid } = rawBody as {
    planId?: number;
    productType?: string;
    quantity?: number;
    period?: 'monthly' | 'yearly';
    openid: string;
  };

  console.log('[JSAPI-DEBUG] 解析后参数:', JSON.stringify({ planId, productType, quantity, period, openid: openid ? openid.substring(0, 8) + '...' : 'null' }));

  if (!openid) {
    console.log('[JSAPI-DEBUG] ❌ 缺少openid');
    throw new BadRequestError('缺少用户标识(openid)，请在微信中打开');
  }

  // Token 包支付
  if (productType === 'token-pack' && quantity) {
    const orderNo = PaymentService.generateOrderNo();
    const packPrice = 4.80; // 100分钟×0.048
    const amount = Math.round(packPrice * quantity * 100) / 100;
    const subject = `${quantity}包积分包（共${100 * quantity}分钟）`;

    await prisma.order.create({
      data: {
        userId, orderNo, planId: null,
        productType: 'token-pack', amount,
        status: 'pending', paymentMethod: 'wechat',
      }
    });

    const payParams = await PaymentService.generateWechatJsapiPayment(orderNo, amount, subject, openid);

    console.log('[JSAPI-DEBUG] ✅ Token包支付创建成功, payParams keys:', Object.keys(payParams || {}));
    console.log('[JSAPI-DEBUG] 返回前端数据:', JSON.stringify({ orderNo, amount, payParams: { ...payParams, paySign: payParams?.paySign?.substring(0, 20) + '...'  } }));

    ctx.body = {
      code: 0, message: '订单创建成功',
      data: { orderNo, amount, planName: subject, payParams }
    };
    return;
  }

  if (!planId) {
    throw new BadRequestError('请选择套餐');
  }

  // 获取套餐信息
  const plan = await prisma.subscriptionPlan.findUnique({
    where: { id: planId }
  });

  if (!plan) {
    throw new BadRequestError('套餐不存在');
  }

  // 生成订单
  const orderNo = PaymentService.generateOrderNo();
  const amount = period === 'yearly' ? Number(plan.priceYearly) : Number(plan.priceMonthly);

  // 创建订单记录
  await prisma.order.create({
    data: {
      userId,
      orderNo,
      planId,
      productType: period,
      amount,
      status: 'pending',
      paymentMethod: 'wechat',
    }
  });

  // 调用微信 JSAPI 支付
  const payParams = await PaymentService.generateWechatJsapiPayment(
    orderNo,
    amount,
    plan.name,
    openid
  );

  console.log('[JSAPI-DEBUG] ✅ 套餐支付创建成功, payParams keys:', Object.keys(payParams || {}));
  console.log('[JSAPI-DEBUG] 返回前端数据:', JSON.stringify({ orderNo, amount, planName: plan.name, payParams: { ...payParams, paySign: payParams?.paySign?.substring(0, 20) + '...' } }));

  ctx.body = {
    code: 0,
    message: '订单创建成功',
    data: {
      orderNo,
      amount,
      planName: plan.name,
      payParams // 用于 wx.chooseWXPay 的参数
    }
  };
});

export default router;