import { Inject, Injectable } from "@nestjs/common";
import { loadEnv } from "../../config/env.js";
import { logger } from "../../common/logger.js";
import { PrismaService } from "../../common/prisma.service.js";
import { RedisService } from "../../common/redis.service.js";
import { APP_VERSION } from "../../constants.js";

export interface DeepCheck {
  postgres: boolean;
  redis: boolean;
}

@Injectable()
export class HealthService {
  private readonly startedAt = Date.now();

  constructor(
    @Inject(PrismaService) private readonly prisma: PrismaService,
    @Inject(RedisService) private readonly redis: RedisService
  ) {}

  liveness(): { status: "ok"; version: string; uptime: number } {
    return { status: "ok", version: APP_VERSION, uptime: Math.round((Date.now() - this.startedAt) / 1000) };
  }

  async deep(): Promise<{ ok: boolean; checks: DeepCheck }> {
    let postgres = false;
    try {
      await this.prisma.$queryRaw`SELECT 1`;
      postgres = true;
    } catch (err) {
      logger.warn(`health: postgres unreachable: ${(err as Error).message}`);
    }
    let redis = false;
    try {
      redis = await this.redis.ping();
    } catch {
      redis = false;
    }
    return { ok: postgres && redis, checks: { postgres, redis } };
  }
}