import { BadRequestException, Controller, Get, Header, Inject, Param, Query, Res } from '@nestjs/common';
import type { Response } from 'express';
import { ok } from '../common/api-response.js';
import { parseH6ReportQuery, type H6ReportQueryParams } from './h6-report.js';
import { ReportsService } from './reports.service.js';

interface H6QueryParams extends H6ReportQueryParams {
  format?: string;
}

@Controller('api/v1/reports')
export class ReportsController {
  constructor(@Inject(ReportsService) private readonly reports: ReportsService) {}

  @Get()
  catalog() {
    return ok(this.reports.catalog());
  }

  @Get('h6')
  h6(@Query() raw: H6QueryParams) {
    return ok(this.reports.h6(parseH6ReportQuery(raw)));
  }

  @Get('h6/export')
  @Header('Cache-Control', 'no-store')
  exportH6(@Query() raw: H6QueryParams, @Res() response: Response) {
    const format = raw.format ?? 'json';
    if (format !== 'json' && format !== 'html') throw new BadRequestException('H6_REPORT_INVALID_FORMAT');
    const report = this.reports.h6(parseH6ReportQuery(raw));
    const body = this.reports.serializeH6(report, format);
    const stamp = report.generated_at.slice(0, 10);
    response.type(format === 'html' ? 'text/html; charset=utf-8' : 'application/json; charset=utf-8');
    response.setHeader('Content-Disposition', `attachment; filename="casan-h6-report-${stamp}.${format}"`);
    response.send(body);
  }

  @Get('run/:traceId')
  run(@Param('traceId') traceId: string) {
    return ok(this.reports.run(traceId));
  }

  @Get('run/:traceId/export')
  @Header('Cache-Control', 'no-store')
  exportRun(
    @Param('traceId') traceId: string,
    @Query('format') rawFormat: string | undefined,
    @Res() response: Response,
  ) {
    const format = rawFormat ?? 'json';
    if (format !== 'json' && format !== 'html') throw new BadRequestException('RUN_REPORT_INVALID_FORMAT');
    const report = this.reports.run(traceId);
    response.type(format === 'html' ? 'text/html; charset=utf-8' : 'application/json; charset=utf-8');
    response.setHeader('Content-Disposition', `attachment; filename="casan-run-${traceId}.${format}"`);
    response.send(this.reports.serializeRun(report, format));
  }
}