import { Controller, Get, HttpException, HttpStatus, Inject } from '@nestjs/common';
import { ApiOkResponse, ApiServiceUnavailableResponse, ApiTags } from '@nestjs/swagger';

import { HealthResponseDto } from '../../../libs/http-contracts/src/health.dto';
import { HealthService } from './health.service';

@ApiTags('health')
@Controller('health')
/** 将内部健康结果映射为 200/503，同时保持两种响应共用同一 OpenAPI DTO。 */
export class HealthController {
  constructor(@Inject(HealthService) private readonly healthService: HealthService) {}

  @Get()
  @ApiOkResponse({ type: HealthResponseDto })
  @ApiServiceUnavailableResponse({ type: HealthResponseDto })
  async getHealth(): Promise<HealthResponseDto> {
    const response = await this.healthService.check();
    if (response.status === 'unavailable') {
      throw new HttpException(response, HttpStatus.SERVICE_UNAVAILABLE);
    }
    return response;
  }
}