import {
  BadRequestException,
  Controller,
  ForbiddenException,
  HttpCode,
  HttpStatus,
  Logger,
  Post,
  Req,
  UseGuards,
  UseInterceptors,
} from '@nestjs/common';
import SpaceAbilityFactory from '../../core/casl/abilities/space-ability.factory';
import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard';
import { AuthUser } from '../../common/decorators/auth-user.decorator';
import { User, Workspace } from '@docmost/db/types/entity.types';
import {
  SpaceCaslAction,
  SpaceCaslSubject,
} from '../../core/casl/interfaces/space-ability.type';
import { FileInterceptor } from '../../common/interceptors/file.interceptor';
import * as bytes from 'bytes';
import * as path from 'path';
import { MAX_FILE_SIZE } from '../../core/attachment/attachment.constants';
import { ImportService } from './import.service';
import { AuthWorkspace } from '../../common/decorators/auth-workspace.decorator';

@Controller()
export class ImportController {
  private readonly logger = new Logger(ImportController.name);

  constructor(
    private readonly importService: ImportService,
    private readonly spaceAbility: SpaceAbilityFactory,
  ) {}

  @UseInterceptors(FileInterceptor)
  @UseGuards(JwtAuthGuard)
  @HttpCode(HttpStatus.OK)
  @Post('pages/import')
  async importPage(
    @Req() req: any,
    @AuthUser() user: User,
    @AuthWorkspace() workspace: Workspace,
  ) {
    const validFileExtensions = ['.md', '.html'];

    const maxFileSize = bytes(MAX_FILE_SIZE);

    let file = null;
    try {
      file = await req.file({
        limits: { fileSize: maxFileSize, fields: 3, files: 1 },
      });
    } catch (err: any) {
      this.logger.error(err.message);
      if (err?.statusCode === 413) {
        throw new BadRequestException(
          `File too large. Exceeds the ${MAX_FILE_SIZE} limit`,
        );
      }
    }

    if (!file) {
      throw new BadRequestException('Failed to upload file');
    }

    if (
      !validFileExtensions.includes(path.extname(file.filename).toLowerCase())
    ) {
      throw new BadRequestException('Invalid import file type.');
    }

    const spaceId = file.fields?.spaceId?.value;

    if (!spaceId) {
      throw new BadRequestException('spaceId or format not found');
    }

    const ability = await this.spaceAbility.createForUser(user, spaceId);
    if (ability.cannot(SpaceCaslAction.Edit, SpaceCaslSubject.Page)) {
      throw new ForbiddenException();
    }

    return this.importService.importPage(file, user.id, spaceId, workspace.id);
  }
}