import { Injectable, Logger } from '@nestjs/common';
import { PromoMetricEventType } from '@dukang/shared-types';
import { PrismaService } from '../../common/prisma/prisma.module';
import { IpGeoService } from '../../common/geo/ip-geo.service';

export type PromoMetricLogInput = {
  promoCodeId: bigint;
  eventType: PromoMetricEventType;
  userId?: bigint;
  orderId?: bigint;
  sessionId?: string;
  clientIp?: string;
};

@Injectable()
export class PromoMetricLogService {
  private readonly logger = new Logger(PromoMetricLogService.name);

  constructor(
    private readonly prisma: PrismaService,
    private readonly ipGeoService: IpGeoService,
  ) {}

  logEvent(input: PromoMetricLogInput): void {
    void this.writeEvent(input).catch((err) => {
      this.logger.debug(
        `promo metric log failed: ${err instanceof Error ? err.message : err}`,
      );
    });
  }

  private async writeEvent(input: PromoMetricLogInput): Promise<void> {
    const clientIp = input.clientIp?.trim() || null;
    const geo = clientIp ? this.ipGeoService.resolve(clientIp) : { province: null, city: null };

    await this.prisma.logPromoEvent.create({
      data: {
        promoCodeId: input.promoCodeId,
        eventType: input.eventType,
        userId: input.userId ?? null,
        orderId: input.orderId ?? null,
        sessionId: input.sessionId?.trim() || null,
        clientIp,
        ipProvince: geo.province,
        ipCity: geo.city,
      },
    });
  }
}