import { Injectable } from '@nestjs/common';
import { DataSource } from 'typeorm';
import { API_PHASE, API_VERSION } from './version';

@Injectable()
export class HealthService {
  constructor(private readonly dataSource: DataSource) {}

  async check() {
    const startedAt = Date.now();
    await this.dataSource.query('SELECT 1');

    return {
      status: 'ok',
      service: 'dhv2-api',
      api: 'v3',
      version: API_VERSION,
      phase: API_PHASE,
      database: 'ok',
      time: new Date().toISOString(),
      latencyMs: Date.now() - startedAt,
    };
  }
}