import { Injectable, NotFoundException } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { unlink } from 'fs/promises';
import { join } from 'path';
import { Thumbnail } from '../../entities/thumbnail.entity';

@Injectable()
export class ThumbnailsService {
  constructor(
    @InjectRepository(Thumbnail)
    private thumbnailRepository: Repository<Thumbnail>,
  ) {}

  async create(file: Express.Multer.File): Promise<Thumbnail> {
    const thumbnail = this.thumbnailRepository.create({
      filePath: file.filename,
      originalName: file.originalname,
      title: file.originalname.replace(/\.[^/.]+$/, ''),
    });

    return this.thumbnailRepository.save(thumbnail);
  }

  async findOne(id: string): Promise<Thumbnail> {
    const thumbnail = await this.thumbnailRepository.findOne({ where: { id } });
    if (!thumbnail) {
      throw new NotFoundException(`Thumbnail with ID ${id} not found`);
    }
    return thumbnail;
  }

  async remove(id: string): Promise<void> {
    const thumbnail = await this.findOne(id);

    // Delete file from disk
    try {
      await unlink(join('./uploads', thumbnail.filePath));
    } catch (error) {
      console.error('Error deleting file:', error);
    }

    await this.thumbnailRepository.remove(thumbnail);
  }

  formatThumbnailResponse(thumbnail: Thumbnail) {
    return {
      id: thumbnail.id,
      url: `/uploads/${thumbnail.filePath}`,
      originalName: thumbnail.originalName,
      title: thumbnail.title,
      position: thumbnail.position,
    };
  }
}