import { Injectable, Logger } from '@nestjs/common';
import { Cron } from '@nestjs/schedule';
import { PrismaService } from '../prisma/prisma.service';
import { PlatformAdminAlertService } from './platform-admin-alert.service';

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

  constructor(
    private readonly prisma: PrismaService,
    private readonly alerts: PlatformAdminAlertService,
  ) {}

  @Cron('15 * * * *', { timeZone: 'Asia/Tehran' })
  async handleHourly(): Promise<void> {
    await this.notifyEnded();
  }

  async notifyEnded(): Promise<number> {
    const rows = await this.prisma.billingAccount.findMany({
      where: {
        expiryNotifiedAt: null,
        planCode: { not: 'lifetime' },
        status: { not: 'suspended' },
        expiresAt: { lte: new Date() },
      },
      select: { id: true },
      take: 100,
    });
    for (const row of rows) {
      try {
        await this.alerts.notifySubscriptionEnded(row.id);
      } catch (error) {
        this.logger.warn(
          `expiry notify failed ${row.id}: ${error instanceof Error ? error.message : 'unknown'}`,
        );
      }
    }
    if (rows.length) this.logger.log(`subscription expiry checked: ${rows.length}`);
    return rows.length;
  }
}