import {
  BadRequestException,
  Injectable,
  NotFoundException,
} from '@nestjs/common';
import { randomBytes } from 'crypto';
import {
  calcRedeemSettleAmount,
  generateRedeemNo,
  generateRedeemPendingNo,
  REDEEM_WEAKNET_FAIL_THRESHOLD,
  validateRedeemAmount,
  allocateBenefitCoupons,
} from '@dukang/domain';
import {
  ClientApp,
  REDEEM_PENDING_SNAPSHOT_TTL_SECONDS,
  REDEEM_PHONE_SESSION_TTL_SECONDS,
  REDEEM_RESULT_TTL_SECONDS,
  REDEEM_TOKEN_TTL_SECONDS,
  SmsScene,
} from '@dukang/shared-types';
import { Prisma } from '@prisma/client';
import { PrismaService } from '../../common/prisma/prisma.module';
import { RedisService } from '../../common/redis/redis.service';
import { serializeBigInt } from '../../common/decorators/current-user.decorator';
import { AnalyticsService } from '../analytics/analytics.service';
import { SettlementService } from '../settlement/settlement.service';
import { BenefitService } from '../benefit/benefit.service';
import { AuthService } from '../iam/auth.service';
import { PayRedeemAnomalyService } from '../../common/alert/pay-redeem-anomaly.service';

type TokenPayload = {
  userId: string;
  couponId?: string;
  amount: number;
  storeId?: string | null;
  allocations?: Array<{ couponId: string; amount: number }>;
};

type PendingSnapshot = TokenPayload & {
  redeemType: 'DIRECT' | 'COUPON';
};

type RedeemResultPayload = {
  recordId: string;
  redeemNo: string;
  userId: string;
  amount: number;
  storeId: string;
  storeName: string;
  createdAt: string;
};

type PhoneRedeemSession = {
  userId: string;
  phone: string;
  storeAccountId: string;
  storeId: string;
  amount?: number;
  allocations?: Array<{ couponId: string; amount: number }>;
  confirmPrepared?: boolean;
};

@Injectable()
export class RedeemService {
  constructor(
    private readonly prisma: PrismaService,
    private readonly redis: RedisService,
    private readonly settlementService: SettlementService,
    private readonly benefitService: BenefitService,
    private readonly analyticsService: AnalyticsService,
    private readonly authService: AuthService,
    private readonly payRedeemAnomaly: PayRedeemAnomalyService,
  ) {}

  private maskPhoneForStore(phone: string) {
    if (phone.length < 7) return phone;
    return `${phone.slice(0, 3)}****${phone.slice(-4)}`;
  }

  private normalizeMobilePhone(phone: string) {
    const normalized = String(phone ?? '').trim();
    if (!/^1\d{10}$/.test(normalized)) {
      throw new BadRequestException('手机号格式无效');
    }
    return normalized;
  }

  private phoneSessionKey(sessionId: string) {
    return `redeem:phone-session:${sessionId}`;
  }

  private async loadOpenStoreAccount(storeAccountId: bigint, storeId: bigint) {
    const binding = await this.prisma.storeAccountStore.findUnique({
      where: {
        storeAccountId_storeId: { storeAccountId, storeId },
      },
      include: {
        storeAccount: true,
        store: true,
      },
    });
    if (!binding) throw new BadRequestException('无权访问该门店');
    if (binding.storeAccount.status !== 'ACTIVE') {
      throw new BadRequestException('门店账号已停用');
    }
    if (binding.store.status !== 'OPEN') {
      throw new BadRequestException('门店未营业');
    }
    return {
      ...binding.storeAccount,
      storeId: binding.store.id,
      store: binding.store,
    };
  }

  private async resolveUserByPhone(phone: string) {
    const user = await this.prisma.user.findFirst({
      where: { phone, mergedIntoUserId: null, status: 1 },
      select: { id: true, userNo: true, phone: true, nickname: true, phoneVerifiedAt: true },
    });
    if (!user) throw new NotFoundException('该手机号未注册好客用户');
    if (!user.phoneVerifiedAt) throw new BadRequestException('用户手机号未验证，无法核销');
    return user;
  }

  private async computeDirectAllocations(userId: bigint, amount: number) {
    const coupons = await this.prisma.benefitCoupon.findMany({
      where: { userId, status: 'ACTIVE' },
      orderBy: { createdAt: 'asc' },
    });
    const totalBalance = coupons.reduce((s, c) => s + Number(c.balance), 0);
    const result = allocateBenefitCoupons(
      coupons.map((c) => ({
        id: c.id.toString(),
        balance: Number(c.balance),
        createdAt: c.createdAt.getTime(),
      })),
      amount,
    );
    if (!result.ok) throw new BadRequestException(result.message);
    const check = validateRedeemAmount(totalBalance, amount);
    if (!check.ok) throw new BadRequestException(check.message);
    return { allocations: result.allocations, totalBalance };
  }

  private async validateAllocations(allocations: Array<{ couponId: string; amount: number }>) {
    for (const alloc of allocations) {
      let couponId: bigint;
      try {
        couponId = BigInt(alloc.couponId);
      } catch {
        throw new BadRequestException('核销分摊数据异常');
      }
      const coupon = await this.prisma.benefitCoupon.findUnique({ where: { id: couponId } });
      if (!coupon) throw new BadRequestException('券不存在');
      const check = validateRedeemAmount(Number(coupon.balance), alloc.amount, Number(coupon.balance));
      if (!check.ok) throw new BadRequestException(check.message);
    }
  }

  private async executeRedeem(
    account: Awaited<ReturnType<RedeemService['loadOpenStoreAccount']>>,
    userId: bigint,
    amount: number,
    normalizedAllocations: Array<{ couponId: string; amount: number }>,
    analyticsExtra?: { channel: 'token' | 'phone'; sessionId?: string; tokenSuffix?: string },
  ) {
    const settlementRate = Number(account.store.settlementRate);
    const settleAmount = calcRedeemSettleAmount(amount, settlementRate);

    let record;
    try {
      record = await this.prisma.$transaction(async (tx) => {
        await this.benefitService.deductCoupons(tx, normalizedAllocations, 'STORE', account.storeId);

        const redeemRecord = await tx.redeemRecord.create({
          data: {
            redeemNo: generateRedeemNo(),
            userId,
            couponId: BigInt(normalizedAllocations[0].couponId),
            storeId: account.storeId,
            amount,
            settleAmount,
            allocations: {
              create: normalizedAllocations.map((item, index) => ({
                couponId: BigInt(item.couponId),
                amount: item.amount,
                sortOrder: index,
              })),
            },
          },
        });

        await this.settlementService.createStorePayout(
          redeemRecord.id,
          account.storeId,
          amount,
          settleAmount,
          settlementRate,
          tx,
        );

        return redeemRecord;
      });
    } catch (e) {
      if (e instanceof Error && e.message === 'BENEFIT_DEDUCT_CONFLICT') {
        throw new BadRequestException('核销失败，请重试');
      }
      if (e instanceof Error && e.message === 'BENEFIT_ALLOC_INVALID') {
        throw new BadRequestException('核销分摊数据异常');
      }
      throw e;
    }

    const redeemExtra = {
      redeemRecordId: record.id.toString(),
      storeId: account.storeId.toString(),
      amount,
      channel: analyticsExtra?.channel ?? 'token',
      ...(analyticsExtra?.sessionId ? { sessionId: analyticsExtra.sessionId } : {}),
      ...(analyticsExtra?.tokenSuffix ? { tokenSuffix: analyticsExtra.tokenSuffix } : {}),
    };
    this.analyticsService.trackStoreOneSafe(account.id, ClientApp.SHOP_H5, {
      storeId: account.storeId,
      eventName: 'store_redeem_confirm',
      refType: 'REDEEM_RECORD',
      refId: record.id,
      extraJson: {
        redeemNo: record.redeemNo,
        amount,
        userId: userId.toString(),
        channel: analyticsExtra?.channel ?? 'token',
      },
    });
    this.analyticsService.trackOneSafe(userId, ClientApp.SHOP_H5, {
      eventName: 'benefit_redeem_success',
      refType: 'STORE',
      refId: account.storeId,
      extraJson: redeemExtra,
    });
    this.analyticsService.trackOneSafe(userId, ClientApp.USER_H5, {
      eventName: 'benefit_redeem_success',
      refType: 'STORE',
      refId: account.storeId,
      extraJson: redeemExtra,
    });

    return record;
  }

  async sendPhoneLookupSms(storeAccountId: bigint, storeId: bigint, phone: string) {
    const account = await this.loadOpenStoreAccount(storeAccountId, storeId);
    const normalizedPhone = this.normalizeMobilePhone(phone);
    await this.resolveUserByPhone(normalizedPhone);
    await this.authService.sendSms(normalizedPhone, SmsScene.REDEEM_PHONE_LOOKUP, {
      clientApp: ClientApp.SHOP_H5,
    });
    this.analyticsService.trackStoreOneSafe(storeAccountId, ClientApp.SHOP_H5, {
      storeId: account.storeId,
      eventName: 'store_redeem_phone_lookup_sms',
      extraJson: { phone: this.maskPhoneForStore(normalizedPhone) },
    });
    return { ok: true, maskedPhone: this.maskPhoneForStore(normalizedPhone) };
  }

  async verifyPhoneAndGetBalance(storeAccountId: bigint, storeId: bigint, phone: string, code: string) {
    const account = await this.loadOpenStoreAccount(storeAccountId, storeId);
    const normalizedPhone = this.normalizeMobilePhone(phone);
    const user = await this.resolveUserByPhone(normalizedPhone);
    await this.authService.verifySmsCode(normalizedPhone, code, SmsScene.REDEEM_PHONE_LOOKUP);

    const coupons = await this.prisma.benefitCoupon.findMany({
      where: { userId: user.id, status: 'ACTIVE' },
    });
    const balance = coupons.reduce((sum, c) => sum + Number(c.balance), 0);

    const sessionId = randomBytes(16).toString('hex');
    await this.redis.setJson(
      this.phoneSessionKey(sessionId),
      {
        userId: user.id.toString(),
        phone: normalizedPhone,
        storeAccountId: storeAccountId.toString(),
        storeId: account.storeId.toString(),
      } satisfies PhoneRedeemSession,
      REDEEM_PHONE_SESSION_TTL_SECONDS,
    );

    this.analyticsService.trackStoreOneSafe(storeAccountId, ClientApp.SHOP_H5, {
      storeId: account.storeId,
      eventName: 'store_redeem_phone_balance',
      extraJson: {
        phone: this.maskPhoneForStore(normalizedPhone),
        totalBalance: balance,
        sessionId,
      },
    });

    return serializeBigInt({
      sessionId,
      totalBalance: balance,
      maskedPhone: this.maskPhoneForStore(normalizedPhone),
      user: {
        id: user.id,
        userNo: user.userNo,
        nickname: user.nickname,
        phone: this.maskPhoneForStore(normalizedPhone),
      },
    });
  }

  private async loadPhoneSession(sessionId: string, storeAccountId: bigint): Promise<PhoneRedeemSession> {
    const session = await this.redis.getJson<PhoneRedeemSession>(this.phoneSessionKey(sessionId));
    if (!session) throw new BadRequestException('核销会话已过期，请重新验证手机号');
    if (session.storeAccountId !== storeAccountId.toString()) {
      throw new BadRequestException('核销会话无效');
    }
    return session;
  }

  async preparePhoneRedeemDirect(
    storeAccountId: bigint,
    storeId: bigint,
    phone: string,
    amount: number,
  ) {
    const account = await this.loadOpenStoreAccount(storeAccountId, storeId);
    const normalizedPhone = this.normalizeMobilePhone(phone);
    const user = await this.resolveUserByPhone(normalizedPhone);
    const { allocations, totalBalance } = await this.computeDirectAllocations(user.id, amount);
    const sessionId = randomBytes(16).toString('hex');

    await this.authService.sendSms(normalizedPhone, SmsScene.REDEEM_PHONE_CONFIRM, {
      clientApp: ClientApp.SHOP_H5,
    });

    await this.redis.setJson(
      this.phoneSessionKey(sessionId),
      {
        userId: user.id.toString(),
        phone: normalizedPhone,
        storeAccountId: storeAccountId.toString(),
        storeId: account.storeId.toString(),
        amount,
        allocations,
        confirmPrepared: true,
      } satisfies PhoneRedeemSession,
      REDEEM_PHONE_SESSION_TTL_SECONDS,
    );

    this.analyticsService.trackStoreOneSafe(storeAccountId, ClientApp.SHOP_H5, {
      storeId: account.storeId,
      eventName: 'store_redeem_phone_prepare',
      extraJson: {
        sessionId,
        amount,
        phone: this.maskPhoneForStore(normalizedPhone),
        flow: 'direct',
      },
    });

    return serializeBigInt({
      sessionId,
      amount,
      totalBalance,
      maskedPhone: this.maskPhoneForStore(normalizedPhone),
      expireInSeconds: REDEEM_PHONE_SESSION_TTL_SECONDS,
      user: {
        id: user.id,
        userNo: user.userNo,
        nickname: user.nickname,
        phone: this.maskPhoneForStore(normalizedPhone),
      },
    });
  }

  async preparePhoneRedeem(storeAccountId: bigint, storeId: bigint, sessionId: string, amount: number) {
    const account = await this.loadOpenStoreAccount(storeAccountId, storeId);
    const session = await this.loadPhoneSession(sessionId, storeAccountId);
    const userId = BigInt(session.userId);
    const { allocations } = await this.computeDirectAllocations(userId, amount);

    await this.authService.sendSms(session.phone, SmsScene.REDEEM_PHONE_CONFIRM, {
      clientApp: ClientApp.SHOP_H5,
    });

    const nextSession: PhoneRedeemSession = {
      ...session,
      amount,
      allocations,
      confirmPrepared: true,
    };
    await this.redis.setJson(
      this.phoneSessionKey(sessionId),
      nextSession,
      REDEEM_PHONE_SESSION_TTL_SECONDS,
    );

    this.analyticsService.trackStoreOneSafe(storeAccountId, ClientApp.SHOP_H5, {
      storeId: account.storeId,
      eventName: 'store_redeem_phone_prepare',
      extraJson: {
        sessionId,
        amount,
        phone: this.maskPhoneForStore(session.phone),
      },
    });

    return {
      sessionId,
      amount,
      expireInSeconds: REDEEM_PHONE_SESSION_TTL_SECONDS,
    };
  }

  async confirmPhoneRedeem(storeAccountId: bigint, storeId: bigint, sessionId: string, code: string) {
    const meta = { storeId, userId: undefined as string | undefined };
    try {
      const account = await this.loadOpenStoreAccount(storeAccountId, storeId);
      const session = await this.loadPhoneSession(sessionId, storeAccountId);
      if (!session.confirmPrepared || session.amount == null || !session.allocations?.length) {
        throw new BadRequestException('请先选择核销金额并发送确认验证码');
      }
      meta.userId = session.userId;

      await this.authService.verifySmsCode(session.phone, code, SmsScene.REDEEM_PHONE_CONFIRM);

      const normalizedAllocations = session.allocations.map((item) => ({
        couponId: String(item.couponId),
        amount: Number(item.amount),
      }));
      const amount = Number(session.amount);
      const allocSum = normalizedAllocations.reduce((sum, item) => sum + item.amount, 0);
      if (Math.abs(allocSum - amount) > 0.001) {
        throw new BadRequestException('核销分摊数据异常');
      }
      await this.validateAllocations(normalizedAllocations);

      this.payRedeemAnomaly.onRedeemAttempt(amount, {
        storeId,
        userId: session.userId,
      });

      const record = await this.executeRedeem(
        account,
        BigInt(session.userId),
        amount,
        normalizedAllocations,
        { channel: 'phone', sessionId },
      );

      await this.redis.del(this.phoneSessionKey(sessionId));

      return serializeBigInt(record);
    } catch (e) {
      this.payRedeemAnomaly.onRedeemFail(e instanceof Error ? e.message : '手机号核销失败', meta);
      throw e;
    }
  }

  async createToken(userId: bigint, body: { couponId?: string; amount: number; storeId?: string }) {
    let allocations: Array<{ couponId: string; amount: number }>;

    if (body.couponId) {
      const coupon = await this.prisma.benefitCoupon.findFirst({
        where: { id: BigInt(body.couponId), userId, status: 'ACTIVE' },
      });
      if (!coupon) throw new NotFoundException('券不存在');
      const balance = Number(coupon.balance);
      const check = validateRedeemAmount(balance, body.amount, balance);
      if (!check.ok) throw new BadRequestException(check.message);
      allocations = [{ couponId: coupon.id.toString(), amount: body.amount }];
    } else {
      const coupons = await this.prisma.benefitCoupon.findMany({
        where: { userId, status: 'ACTIVE' },
        orderBy: { createdAt: 'asc' },
      });
      const totalBalance = coupons.reduce((s, c) => s + Number(c.balance), 0);
      const result = allocateBenefitCoupons(
        coupons.map((c) => ({
          id: c.id.toString(),
          balance: Number(c.balance),
          createdAt: c.createdAt.getTime(),
        })),
        body.amount,
      );
      if (!result.ok) throw new BadRequestException(result.message);
      const check = validateRedeemAmount(totalBalance, body.amount);
      if (!check.ok) throw new BadRequestException(check.message);
      allocations = result.allocations;
    }

    const primaryCouponId = BigInt(allocations[0].couponId);
    const token = randomBytes(16).toString('hex');
    const expireAt = new Date(Date.now() + REDEEM_TOKEN_TTL_SECONDS * 1000);

    await this.redis.setJson(
      `redeem:token:${token}`,
      {
        userId: userId.toString(),
        couponId: primaryCouponId.toString(),
        amount: body.amount,
        storeId: body.storeId ?? null,
        allocations,
      },
      REDEEM_TOKEN_TTL_SECONDS,
    );

    return { token, expireAt, amount: body.amount, boundStoreId: body.storeId ?? null };
  }

  async getToken(token: string) {
    const cached = await this.redis.getJson<Record<string, unknown>>(`redeem:token:${token}`);
    if (!cached) throw new NotFoundException('核销码已过期');
    return cached;
  }

  async getTokenStatus(token: string, userId: bigint) {
    const result = await this.redis.getJson<RedeemResultPayload>(`redeem:result:${token}`);
    if (result) {
      if (result.userId !== userId.toString()) {
        throw new NotFoundException('核销码不存在');
      }
      return {
        status: 'CONSUMED' as const,
        record: {
          id: result.recordId,
          redeemNo: result.redeemNo,
          amount: result.amount,
          storeId: result.storeId,
          storeName: result.storeName,
          createdAt: result.createdAt,
        },
      };
    }

    const cached = await this.redis.getJson<TokenPayload>(`redeem:token:${token}`);
    if (cached) {
      if (cached.userId !== userId.toString()) {
        throw new NotFoundException('核销码不存在');
      }
      const ttl = await this.redis.ttl(`redeem:token:${token}`);
      return {
        status: 'PENDING' as const,
        expireInSeconds: ttl > 0 ? ttl : 0,
        amount: cached.amount,
      };
    }

    return { status: 'EXPIRED' as const };
  }

  async previewRedeem(storeAccountId: bigint, storeId: bigint, token: string) {
    const account = await this.loadOpenStoreAccount(storeAccountId, storeId);

    const cached = await this.redis.getJson<TokenPayload>(`redeem:token:${token}`);
    if (!cached) throw new BadRequestException('核销码无效或已过期');

    if (cached.storeId && cached.storeId !== account.storeId.toString()) {
      throw new BadRequestException('该核销码仅限指定门店使用');
    }

    const user = await this.prisma.user.findUnique({
      where: { id: BigInt(cached.userId) },
      select: { id: true, userNo: true, phone: true, nickname: true },
    });

    const ttl = await this.redis.ttl(`redeem:token:${token}`);
    const redeemType: 'DIRECT' | 'COUPON' =
      cached.allocations && cached.allocations.length > 1
        ? 'DIRECT'
        : cached.couponId
          ? 'COUPON'
          : 'DIRECT';

    await this.redis.setJson(
      `redeem:pending-snapshot:${token}`,
      {
        ...cached,
        redeemType,
      } satisfies PendingSnapshot,
      REDEEM_PENDING_SNAPSHOT_TTL_SECONDS,
    );

    this.analyticsService.trackStoreOneSafe(storeAccountId, 'SHOP_H5', {
      storeId: account.storeId,
      eventName: 'store_redeem_preview',
      extraJson: {
        tokenSuffix: token.slice(-8),
        amount: cached.amount,
        userId: cached.userId,
        redeemType,
      },
    });

    return serializeBigInt({
      token,
      amount: cached.amount,
      user,
      boundStoreId: cached.storeId,
      redeemType,
      expireInSeconds: ttl > 0 ? ttl : 0,
      storeMatch: !cached.storeId || cached.storeId === account.storeId.toString(),
    });
  }

  async confirmRedeem(storeAccountId: bigint, storeId: bigint, body: { token: string }) {
    const meta = { storeId, userId: undefined as string | undefined };
    try {
      const account = await this.loadOpenStoreAccount(storeAccountId, storeId);
      const token = body.token?.trim();
      if (!token) throw new BadRequestException('请提供核销码');

      const existingResult = await this.redis.getJson<RedeemResultPayload>(`redeem:result:${token}`);
      if (existingResult) {
        const record = await this.prisma.redeemRecord.findUnique({
          where: { id: BigInt(existingResult.recordId) },
        });
        if (record) {
          return serializeBigInt(record);
        }
      }

      const cached = await this.redis.getJson<TokenPayload>(`redeem:token:${token}`);
      if (!cached) throw new BadRequestException('核销码无效或已过期');

      if (cached.storeId && cached.storeId !== account.storeId.toString()) {
        throw new BadRequestException('该核销码仅限指定门店使用');
      }

      const allocations =
        cached.allocations ??
        (cached.couponId ? [{ couponId: cached.couponId, amount: cached.amount }] : []);
      if (allocations.length === 0) {
        throw new BadRequestException('核销码数据异常');
      }

      const normalizedAllocations = allocations.map((item) => ({
        couponId: String(item.couponId),
        amount: Number(item.amount),
      }));
      const tokenAmount = Number(cached.amount);
      if (!Number.isFinite(tokenAmount) || tokenAmount <= 0) {
        throw new BadRequestException('核销码数据异常');
      }

      const allocSum = normalizedAllocations.reduce((sum, item) => sum + item.amount, 0);
      if (Math.abs(allocSum - tokenAmount) > 0.001) {
        throw new BadRequestException('核销码数据异常');
      }

      await this.validateAllocations(normalizedAllocations);

      meta.userId = cached.userId;
      this.payRedeemAnomaly.onRedeemAttempt(tokenAmount, {
        storeId,
        userId: cached.userId,
      });

      const record = await this.executeRedeem(
        account,
        BigInt(cached.userId),
        tokenAmount,
        normalizedAllocations,
        { channel: 'token', tokenSuffix: token.slice(-8) },
      );

      await this.redis.setJson(
        `redeem:result:${token}`,
        {
          recordId: record.id.toString(),
          redeemNo: record.redeemNo,
          userId: cached.userId,
          amount: tokenAmount,
          storeId: account.storeId.toString(),
          storeName: account.store.name,
          createdAt: record.createdAt.toISOString(),
        } satisfies RedeemResultPayload,
        REDEEM_RESULT_TTL_SECONDS,
      );
      await this.redis.del(`redeem:token:${token}`);
      await this.redis.del(`redeem:netfail:${storeAccountId}:${token}`);

      return serializeBigInt(record);
    } catch (e) {
      this.payRedeemAnomaly.onRedeemFail(e instanceof Error ? e.message : '核销失败', meta);
      throw e;
    }
  }

  private netFailKey(storeAccountId: bigint, token: string) {
    return `redeem:netfail:${storeAccountId}:${token}`;
  }

  async reportNetworkFailure(
    storeAccountId: bigint,
    storeId: bigint,
    body: {
      token: string;
      errorClass: 'NETWORK' | 'BUSINESS';
      message?: string;
      step: 'preview' | 'confirm';
    },
  ) {
    await this.loadOpenStoreAccount(storeAccountId, storeId);
    const token = body.token.trim();
    if (!token) throw new BadRequestException('请提供核销码');

    let failCount = 0;
    if (body.errorClass === 'NETWORK') {
      failCount = await this.redis.incr(this.netFailKey(storeAccountId, token), REDEEM_TOKEN_TTL_SECONDS);
    } else {
      const raw = await this.redis.get(this.netFailKey(storeAccountId, token));
      failCount = raw ? Number(raw) || 0 : 0;
    }

    const thresholdReached = failCount >= REDEEM_WEAKNET_FAIL_THRESHOLD;

    this.analyticsService.trackStoreOneSafe(storeAccountId, ClientApp.SHOP_H5, {
      storeId,
      eventName: 'store_redeem_confirm_fail',
      extraJson: {
        token,
        tokenSuffix: token.slice(-8),
        errorClass: body.errorClass,
        failCount,
        step: body.step,
        message: body.message?.slice(0, 200) ?? null,
      },
    });

    this.payRedeemAnomaly.onRedeemFail(
      body.message?.slice(0, 200) || `弱网核销失败:${body.errorClass}/${body.step}`,
      { storeId },
    );

    if (thresholdReached && body.errorClass === 'NETWORK') {
      this.analyticsService.trackStoreOneSafe(storeAccountId, ClientApp.SHOP_H5, {
        storeId,
        eventName: 'store_redeem_weaknet_threshold',
        extraJson: {
          token,
          tokenSuffix: token.slice(-8),
          failCount,
          threshold: REDEEM_WEAKNET_FAIL_THRESHOLD,
        },
      });
      this.payRedeemAnomaly.notifyRedeemOps(
        '弱网核销达阈值',
        `门店 ${storeId}\n失败次数 ${failCount}（阈值 ${REDEEM_WEAKNET_FAIL_THRESHOLD}）\ntoken …${token.slice(-8)}`,
        `redeem_weaknet|${storeId}|${token.slice(-8)}`,
      );
    }

    return {
      failCount,
      thresholdReached,
      threshold: REDEEM_WEAKNET_FAIL_THRESHOLD,
    };
  }

  private async resolvePendingSnapshot(token: string): Promise<PendingSnapshot> {
    const live = await this.redis.getJson<TokenPayload>(`redeem:token:${token}`);
    if (live) {
      return {
        ...live,
        redeemType:
          live.allocations && live.allocations.length > 1
            ? 'DIRECT'
            : live.couponId
              ? 'COUPON'
              : 'DIRECT',
      };
    }
    const snap = await this.redis.getJson<PendingSnapshot>(`redeem:pending-snapshot:${token}`);
    if (!snap) throw new BadRequestException('核销码已失效且无可用快照，请用户重新出码或改用手机号核销');
    return snap;
  }

  async submitPendingRedeem(
    storeAccountId: bigint,
    storeId: bigint,
    body: { token: string; photoResourceId: string; failCount?: number; remark?: string },
  ) {
    const account = await this.loadOpenStoreAccount(storeAccountId, storeId);
    const token = body.token.trim();
    if (!token) throw new BadRequestException('请提供核销码');

    const existingPending = await this.prisma.redeemPendingRecord.findFirst({
      where: { redeemToken: token, storeId: account.storeId, status: 'PENDING' },
    });
    if (existingPending) {
      return serializeBigInt({
        pendingId: existingPending.id,
        pendingNo: existingPending.pendingNo,
        redeemToken: existingPending.redeemToken,
        failCount: existingPending.failCount,
      });
    }

    const alreadyDone = await this.redis.getJson<RedeemResultPayload>(`redeem:result:${token}`);
    if (alreadyDone) {
      throw new BadRequestException('该核销码已核销成功，无需提交待处理单');
    }

    const snapshot = await this.resolvePendingSnapshot(token);
    if (snapshot.storeId && snapshot.storeId !== account.storeId.toString()) {
      throw new BadRequestException('该核销码仅限指定门店使用');
    }

    const photoId = BigInt(body.photoResourceId);
    const photo = await this.prisma.commonResource.findFirst({
      where: { id: photoId, status: 'ACTIVE' },
    });
    if (!photo) throw new BadRequestException('核销码照片不存在');

    const allocations =
      snapshot.allocations ??
      (snapshot.couponId ? [{ couponId: snapshot.couponId, amount: snapshot.amount }] : []);
    if (!allocations.length) throw new BadRequestException('核销码数据异常');

    const rawFail = await this.redis.get(this.netFailKey(storeAccountId, token));
    const failCount = Math.max(
      Number(body.failCount) || 0,
      rawFail ? Number(rawFail) || 0 : 0,
      REDEEM_WEAKNET_FAIL_THRESHOLD,
    );

    const pending = await this.prisma.redeemPendingRecord.create({
      data: {
        pendingNo: generateRedeemPendingNo(),
        redeemToken: token,
        storeId: account.storeId,
        storeAccountId: account.id,
        userId: BigInt(snapshot.userId),
        amount: snapshot.amount,
        redeemType: snapshot.redeemType,
        allocationsJson: allocations as Prisma.InputJsonValue,
        photoResourceId: photoId,
        failCount,
        remark: body.remark?.trim() || null,
      },
    });

    this.analyticsService.trackStoreOneSafe(storeAccountId, ClientApp.SHOP_H5, {
      storeId: account.storeId,
      eventName: 'store_redeem_pending_submit',
      refType: 'REDEEM_PENDING',
      refId: pending.id,
      extraJson: {
        pendingNo: pending.pendingNo,
        redeemToken: token,
        photoResourceId: photoId.toString(),
        failCount,
        amount: Number(pending.amount),
      },
    });

    this.payRedeemAnomaly.notifyRedeemOps(
      '新建补核销待办',
      `待办 ${pending.pendingNo}\n门店 ${account.storeId}\n金额 ${Number(pending.amount)} 元\n失败次数 ${failCount}`,
      `redeem_pending|${pending.pendingNo}`,
    );

    return serializeBigInt({
      pendingId: pending.id,
      pendingNo: pending.pendingNo,
      redeemToken: pending.redeemToken,
      failCount: pending.failCount,
    });
  }

  async listPendingRedeems(query: {
    page?: number;
    pageSize?: number;
    status?: 'PENDING' | 'COMPLETED' | 'REJECTED';
    storeId?: string;
    pendingNo?: string;
    redeemToken?: string;
  }) {
    const page = query.page ?? 1;
    const pageSize = query.pageSize ?? 20;
    const where: Prisma.RedeemPendingRecordWhereInput = {};
    if (query.status) where.status = query.status;
    if (query.storeId) where.storeId = BigInt(query.storeId);
    if (query.pendingNo) where.pendingNo = { contains: query.pendingNo };
    if (query.redeemToken) where.redeemToken = { contains: query.redeemToken };

    const [items, total] = await Promise.all([
      this.prisma.redeemPendingRecord.findMany({
        where,
        orderBy: { createdAt: 'desc' },
        skip: (page - 1) * pageSize,
        take: pageSize,
        include: {
          store: { select: { id: true, name: true, cityName: true } },
          user: { select: { id: true, userNo: true, phone: true, nickname: true } },
          photoResource: { select: { id: true, url: true } },
          redeemRecord: { select: { id: true, redeemNo: true } },
        },
      }),
      this.prisma.redeemPendingRecord.count({ where }),
    ]);

    return serializeBigInt({
      items: items.map((row) => ({
        ...row,
        photoUrl: row.photoResource?.url ?? null,
        photoResource: undefined,
      })),
      total,
      page,
      pageSize,
    });
  }

  async getPendingRedeem(id: bigint) {
    const row = await this.prisma.redeemPendingRecord.findUnique({
      where: { id },
      include: {
        store: { select: { id: true, name: true, cityName: true, phone: true } },
        user: { select: { id: true, userNo: true, phone: true, nickname: true } },
        photoResource: { select: { id: true, url: true } },
        redeemRecord: { select: { id: true, redeemNo: true, amount: true, settleAmount: true } },
        storeAccount: { select: { id: true, name: true, phone: true } },
      },
    });
    if (!row) throw new NotFoundException('待处理核销单不存在');
    return serializeBigInt({
      ...row,
      photoUrl: row.photoResource?.url ?? null,
    });
  }

  async completePendingRedeem(pendingId: bigint, hqAccountId: bigint) {
    const pending = await this.prisma.redeemPendingRecord.findUnique({
      where: { id: pendingId },
    });
    if (!pending) throw new NotFoundException('待处理核销单不存在');
    if (pending.status === 'COMPLETED' && pending.redeemRecordId) {
      const record = await this.prisma.redeemRecord.findUnique({
        where: { id: pending.redeemRecordId },
      });
      return serializeBigInt({ pending, record });
    }
    if (pending.status !== 'PENDING') {
      throw new BadRequestException('待处理单状态不可补核销');
    }

    const account = await this.loadOpenStoreAccount(pending.storeAccountId, pending.storeId);

    const allocationsRaw = pending.allocationsJson as Array<{ couponId: string; amount: number }>;
    const normalizedAllocations = allocationsRaw.map((item) => ({
      couponId: String(item.couponId),
      amount: Number(item.amount),
    }));
    await this.validateAllocations(normalizedAllocations);

    const amount = Number(pending.amount);
    const record = await this.executeRedeem(
      account,
      pending.userId,
      amount,
      normalizedAllocations,
      { channel: 'token', tokenSuffix: pending.redeemToken.slice(-8) },
    );

    const now = new Date();
    const updated = await this.prisma.redeemPendingRecord.update({
      where: { id: pending.id },
      data: {
        status: 'COMPLETED',
        redeemRecordId: record.id,
        processedAt: now,
        processedByHqId: hqAccountId,
      },
      include: {
        store: { select: { id: true, name: true } },
        user: { select: { id: true, userNo: true, phone: true } },
        redeemRecord: true,
      },
    });

    await this.redis.setJson(
      `redeem:result:${pending.redeemToken}`,
      {
        recordId: record.id.toString(),
        redeemNo: record.redeemNo,
        userId: pending.userId.toString(),
        amount,
        storeId: account.storeId.toString(),
        storeName: account.store.name,
        createdAt: record.createdAt.toISOString(),
      } satisfies RedeemResultPayload,
      REDEEM_RESULT_TTL_SECONDS,
    );
    await this.redis.del(`redeem:token:${pending.redeemToken}`);
    await this.redis.del(`redeem:pending-snapshot:${pending.redeemToken}`);
    await this.redis.del(this.netFailKey(pending.storeAccountId, pending.redeemToken));

    this.analyticsService.trackStoreOneSafe(pending.storeAccountId, ClientApp.SHOP_H5, {
      storeId: pending.storeId,
      eventName: 'store_redeem_pending_complete',
      refType: 'REDEEM_PENDING',
      refId: pending.id,
      extraJson: {
        pendingNo: pending.pendingNo,
        redeemToken: pending.redeemToken,
        redeemNo: record.redeemNo,
        hqAccountId: hqAccountId.toString(),
      },
    });

    return serializeBigInt({ pending: updated, record });
  }

  async rejectPendingRedeem(pendingId: bigint, hqAccountId: bigint, reason: string) {
    const pending = await this.prisma.redeemPendingRecord.findUnique({
      where: { id: pendingId },
    });
    if (!pending) throw new NotFoundException('待处理核销单不存在');
    if (pending.status !== 'PENDING') {
      throw new BadRequestException('仅待处理状态可驳回');
    }
    const rejectReason = reason?.trim();
    if (!rejectReason) throw new BadRequestException('请填写驳回原因');

    const updated = await this.prisma.redeemPendingRecord.update({
      where: { id: pendingId },
      data: {
        status: 'REJECTED',
        rejectReason,
        processedAt: new Date(),
        processedByHqId: hqAccountId,
      },
    });

    this.analyticsService.trackStoreOneSafe(pending.storeAccountId, ClientApp.SHOP_H5, {
      storeId: pending.storeId,
      eventName: 'store_redeem_pending_reject',
      refType: 'REDEEM_PENDING',
      refId: pending.id,
      extraJson: {
        pendingNo: pending.pendingNo,
        redeemToken: pending.redeemToken,
        reason: rejectReason,
        hqAccountId: hqAccountId.toString(),
      },
    });

    return serializeBigInt(updated);
  }

  async listShopRecords(storeAccountId: bigint, storeId: bigint, page = 1, pageSize = 20) {
    await this.prisma.storeAccountStore.findUniqueOrThrow({
      where: { storeAccountId_storeId: { storeAccountId, storeId } },
    });
    const [list, total] = await Promise.all([
      this.prisma.redeemRecord.findMany({
        where: { storeId },
        orderBy: { createdAt: 'desc' },
        skip: (page - 1) * pageSize,
        take: pageSize,
        include: { payout: true },
      }),
      this.prisma.redeemRecord.count({ where: { storeId } }),
    ]);
    return { list: serializeBigInt(list), total, page, pageSize };
  }

  async getShopDashboard(storeAccountId: bigint, storeId: bigint) {
    const binding = await this.prisma.storeAccountStore.findUniqueOrThrow({
      where: { storeAccountId_storeId: { storeAccountId, storeId } },
      include: { store: true },
    });
    const start = new Date();
    start.setHours(0, 0, 0, 0);
    const records = await this.prisma.redeemRecord.findMany({
      where: { storeId, createdAt: { gte: start } },
    });
    const todayCount = records.length;
    const todayAmount = records.reduce((sum, r) => sum + Number(r.amount), 0);
    const recent = await this.prisma.redeemRecord.findMany({
      where: { storeId },
      orderBy: { createdAt: 'desc' },
      take: 3,
    });
    return serializeBigInt({
      store: binding.store,
      todayCount,
      todayAmount,
      recentRecords: recent,
    });
  }

  async submitRating(userId: bigint, body: { redeemRecordId: string; serviceScore: number; envScore: number }) {
    const record = await this.prisma.redeemRecord.findFirst({
      where: { id: BigInt(body.redeemRecordId), userId },
    });
    if (!record) throw new NotFoundException('核销记录不存在');
    const rating = await this.prisma.storeRating.create({
      data: {
        redeemRecordId: record.id,
        storeId: record.storeId,
        serviceScore: body.serviceScore,
        envScore: body.envScore,
      },
    });
    return serializeBigInt(rating);
  }
}