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 { ReportMaterialsService } from './report-materials.service';
import { ReportBatchDownloadService } from './batch-download.service';
import {
  CreateImportProfileDto,
  CreateReportBatchDto,
  ImportCommitDto,
  ReviewImportItemsDto,
  SingleReportMaterialDto,
} from './report-materials.contracts';

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,
    private readonly batchDownloads: ReportBatchDownloadService,
  ) {}

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

  @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: 100 * 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,
      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('imports/review-batches')
  listImportReviewBatches(
    @Query('reportType') reportType?: 'signature' | 'drainage',
    @Query('status') status?: string,
    @Query('keyword') keyword?: string,
    @Query('startAt') startAt?: string,
    @Query('endAt') endAt?: string,
    @Query('page') page?: string,
    @Query('pageSize') pageSize?: string,
  ) {
    return this.service.listImportReviewBatches({
      reportType,
      status,
      keyword,
      startAt,
      endAt,
      page: Number(page),
      pageSize: Number(pageSize),
    });
  }

  @Post('imports/:id/review')
  @RequireRecentAuthentication()
  reviewImportItems(
    @Param('id') id: string,
    @Body() body: ReviewImportItemsDto,
    @CurrentSessionUserId() reviewerId?: string,
  ) {
    return this.service.reviewImportItems(id, { ...body, reviewerId });
  }

  @Get('batches')
  listBatches(
    @Query('keyword') keyword?: string,
    @Query('startAt') startAt?: string,
    @Query('endAt') endAt?: string,
    @Query('page') page?: string,
    @Query('pageSize') pageSize?: string,
  ) {
    return this.service.listBatches({ keyword, startAt, endAt, page: Number(page), pageSize: Number(pageSize) });
  }

  @Get('batches/:id/download')
  async downloadBatch(
    @Param('id') id: string,
    @Query('outputFormat') outputFormat: 'excel_drawing' | 'wps_cell_image' | undefined,
    @Res() response: DownloadResponse,
  ) {
    this.sendDownload(response, await this.batchDownloads.exportBundle(await this.service.getBatch(id), outputFormat));
  }

  @Get('batches/:id/files/:fileId/download')
  async downloadBatchFile(
    @Param('id') id: string,
    @Param('fileId') fileId: string,
    @Query('outputFormat') outputFormat: 'excel_drawing' | 'wps_cell_image' | undefined,
    @Res() response: DownloadResponse,
  ) {
    this.sendDownload(
      response,
      await this.batchDownloads.exportFile(await this.service.getBatch(id), fileId, outputFormat),
    );
  }

  @Get('batches/:id')
  getBatch(@Param('id') id: string) {
    return this.service.getBatch(id);
  }

  @Get('batches/:id/tasks')
  listBatchTasks(
    @Param('id') id: string,
    @Query('keyword') keyword?: string,
    @Query('reportType') reportType?: string,
    @Query('status') status?: string,
    @Query('channelId') channelId?: string,
    @Query('page') page?: string,
    @Query('pageSize') pageSize?: string,
  ) {
    return this.service.listBatchTasks(id, {
      keyword,
      reportType,
      status,
      channelId,
      page: Number(page),
      pageSize: Number(pageSize),
    });
  }

  @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 });
  }

  @Post('single-detail')
  getSingleMaterialDetail(@Body() body: SingleReportMaterialDto) {
    return this.service.getSingleMaterialDetail(body);
  }

  @Post('single-export')
  @RequireRecentAuthentication()
  async exportSingleMaterial(
    @Body() body: SingleReportMaterialDto | undefined,
    @CurrentSessionUserId() operatorId: string | undefined,
    @Res() response: DownloadResponse,
  ) {
    this.sendWorkbook(response, await this.service.exportSingleMaterial(body, 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);
  }

  private sendDownload(
    response: DownloadResponse,
    exported: { fileName: string; contentType: string; content: Buffer },
  ) {
    response.setHeader('Content-Type', exported.contentType);
    response.setHeader('Content-Disposition', `attachment; filename*=UTF-8''${encodeURIComponent(exported.fileName)}`);
    response.send(exported.content);
  }
}