import { Controller, Get, HttpCode, HttpStatus } from '@nestjs/common';
import { ApiOperation, ApiTags } from '@nestjs/swagger';

import { Public } from '@/common/decorators/public.decorator';

import { HealthService, type HealthCheckResult } from './health.service';

@ApiTags('health')
@Controller('health')
export class HealthController {
  constructor(private readonly healthService: HealthService) {}

  /**
   * Liveness. Answers "is the process running?" and nothing else — it must not
   * touch the database, or a brief DB blip would make the orchestrator kill
   * otherwise-healthy containers.
   */
  @Public()
  @Get('live')
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Liveness probe' })
  live(): { status: 'ok' } {
    return { status: 'ok' };
  }

  /** Readiness / deep check: should this instance receive traffic? */
  @Public()
  @Get()
  @HttpCode(HttpStatus.OK)
  @ApiOperation({ summary: 'Readiness probe with dependency status' })
  check(): Promise<HealthCheckResult> {
    return this.healthService.check();
  }
}