import { BadRequestException, Body, Controller, Get, Param, Post, Put, Query, Res, UploadedFile, UseInterceptors } from '@nestjs/common';
import { FileInterceptor } from '@nestjs/platform-express';
import { ApiTags } from '@nestjs/swagger';
import { RequireRecentAuthentication } from '../auth/require-recent-authentication.decorator';
import { CurrentSessionUserId } from '../auth/current-session-user.decorator';
import { CreateImportProfileDto, CreateReportBatchDto, ImportCommitDto, ReportMaterialsService } from './report-materials.service';

type UploadedWorkbook = { originalname: string; mimetype: string; size: number; buffer: Buffer };
type DownloadResponse = { setHeader(name: string, value: string): void; send(content: Buffer): void };

@ApiTags('report-materials')
@Controller('admin/report-materials')
export class ReportMaterialsController {
  constructor(private readonly service: ReportMaterialsService) {}

  @Get('pending')
  listPending(@Query('reportType') reportType?: 'signature' | 'drainage', @Query('tenantId') tenantId?: string, @Query('applicationId') applicationId?: string) {
    return this.service.listPending({ reportType, tenantId, applicationId });
  }

  @Get('templates/:reportType')
  async downloadTemplate(@Param('reportType') reportType: 'signature' | 'drainage', @CurrentSessionUserId() operatorId: string | undefined, @Res() response: DownloadResponse) {
    if (!['signature', 'drainage'].includes(reportType)) throw new BadRequestException('reportType must be signature or drainage');
    this.sendWorkbook(response, await this.service.buildOfficialTemplate(reportType, operatorId));
  }

  @Get('pending/export')
  async exportPending(@Query('reportType') reportType: 'signature' | 'drainage' | undefined, @Query('tenantId') tenantId: string | undefined, @Query('applicationId') applicationId: string | undefined, @CurrentSessionUserId() operatorId: string | undefined, @Res() response: DownloadResponse) {
    this.sendWorkbook(response, await this.service.exportPending({ reportType, tenantId, applicationId }, operatorId));
  }

  @Get('import-profiles')
  listImportProfiles(@Query('reportType') reportType?: 'signature' | 'drainage') {
    return this.service.listImportProfiles(reportType);
  }

  @Post('import-profiles')
  @RequireRecentAuthentication()
  saveImportProfile(@Body() body: CreateImportProfileDto) {
    return this.service.saveImportProfile(body);
  }

  @Post('imports/analyze')
  @UseInterceptors(FileInterceptor('file', { limits: { fileSize: 10 * 1024 * 1024, files: 1, fields: 12, parts: 13 } }))
  analyzeImport(@UploadedFile() file: UploadedWorkbook, @Body() body: Record<string, string>, @CurrentSessionUserId() operatorId?: string) {
    if (!file) throw new BadRequestException('请选择 XLSX 文件');
    return this.service.analyzeImport(file, {
      tenantId: body.tenantId,
      applicationId: body.applicationId || undefined,
      reportType: body.reportType as 'signature' | 'drainage',
      sheetName: body.sheetName || undefined,
      headerRowCount: Number(body.headerRowCount || 1),
      dataStartRow: Number(body.dataStartRow || 2),
      profileId: body.profileId || undefined,
      operatorId,
    });
  }

  @Put('imports/:id/commit')
  @RequireRecentAuthentication()
  commitImport(@Param('id') id: string, @Body() body: ImportCommitDto, @CurrentSessionUserId() operatorId?: string) {
    return this.service.commitImport(id, { ...body, operatorId });
  }

  @Get('batches')
  listBatches() {
    return this.service.listBatches();
  }

  @Post('batches/preflight')
  preflightBatch(@Body() body: CreateReportBatchDto) {
    return this.service.preflightBatch(body);
  }

  @Post('batches')
  @RequireRecentAuthentication()
  createBatch(@Body() body: CreateReportBatchDto, @CurrentSessionUserId() operatorId?: string) {
    return this.service.createBatch({ ...body, createdById: operatorId });
  }


  private sendWorkbook(response: DownloadResponse, exported: { fileName: string; content: Buffer }) {
    response.setHeader('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
    response.setHeader('Content-Disposition', `attachment; filename*=UTF-8''${encodeURIComponent(exported.fileName)}`);
    response.send(exported.content);
  }
}