import {
  BadRequestException,
  Body,
  Controller,
  Delete,
  Get,
  HttpCode,
  Param,
  ParseUUIDPipe,
  Patch,
  Post,
  Query,
  StreamableFile,
  UploadedFile,
  UseInterceptors,
} from '@nestjs/common';
import { FileInterceptor } from '@nestjs/platform-express';
import {
  DOCUMENT_MAX_BYTES,
  DocumentCorpusUpdateSchema,
  type DocumentCorpusUpdate,
} from '@siop/shared';
import {
  AuthenticatedUser,
  CurrentUser,
} from '../auth/current-user.decorator';
import { ZodValidationPipe } from '../common/zod-validation.pipe';
import { RequirePermission } from '../permissions/require-permission.decorator';
import { DocumentsService } from './documents.service';

@Controller('documents')
export class DocumentsController {
  constructor(private readonly documents: DocumentsService) {}

  /** Bibliothèque interne — authentification seule (les cartes « Documents »
   *  des fiches la consomment). */
  @Get()
  list(
    @Query('assetId') assetId?: string,
    @Query('workOrderId') workOrderId?: string,
    @Query('kind') kind?: string,
  ) {
    return this.documents.list({ assetId, workOrderId, kind });
  }

  @Post()
  @UseInterceptors(
    FileInterceptor('file', { limits: { fileSize: DOCUMENT_MAX_BYTES } }),
  )
  upload(
    @UploadedFile() file: Express.Multer.File | undefined,
    @Body() body: { kind?: string; assetId?: string; workOrderId?: string },
    @CurrentUser() user: AuthenticatedUser,
  ) {
    if (!file) throw new BadRequestException('Aucun fichier reçu (champ « file »)');
    return this.documents.upload(
      {
        buffer: file.buffer,
        originalName: file.originalname,
        contentType: file.mimetype,
        size: file.size,
        kind: body.kind ?? 'OTHER',
        assetId: body.assetId || undefined,
        workOrderId: body.workOrderId || undefined,
      },
      user,
    );
  }

  @Get(':id/download')
  async download(@Param('id', ParseUUIDPipe) id: string): Promise<StreamableFile> {
    const { stream, fileName, contentType } = await this.documents.download(id);
    return new StreamableFile(stream as never, {
      type: contentType,
      disposition: `attachment; filename*=UTF-8''${encodeURIComponent(fileName)}`,
    });
  }

  /** Corpus IA (D3) : réservé aux gestionnaires du référentiel. */
  @Patch(':id/corpus')
  @RequirePermission('ASSETS', 'edit')
  setCorpus(
    @Param('id', ParseUUIDPipe) id: string,
    @Body(new ZodValidationPipe(DocumentCorpusUpdateSchema)) body: DocumentCorpusUpdate,
  ) {
    return this.documents.setCorpus(id, body.inCorpus);
  }

  @Delete(':id')
  @HttpCode(204)
  remove(@Param('id', ParseUUIDPipe) id: string, @CurrentUser() user: AuthenticatedUser) {
    return this.documents.remove(id, user);
  }
}