import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { IAttachment } from '../../core/interfaces/attachment.interface';
import { AbstractAttachmentDto } from './../dtos/abstract-attachment.dto';

@Injectable()
export class AbstractAttachmentService {
    constructor(
        @InjectModel('Attachment') private readonly attachmentModel: Model<IAttachment>,
    ) {}

    /**
     * Add attachment
     *
     * @param {any[]} files
     * @param {string} userId
     * @returns {Promise<IAttachment[]>}
     * @memberof AbstractAttachmentService
     */
    async addAttachments(files: any[], userId: string): Promise<IAttachment[]> {
        const attachments: IAttachment[] = [];

        for (const file of files) {
            // Get the file properties
            const { filename, originalname, mimetype, size } = file;

            // Form the attachment object
            let attachment = new AbstractAttachmentDto(filename, originalname, mimetype, size, true);

            // Collect all attachments
            attachments.push(new this.attachmentModel(attachment));
        }

        // Persist the data
        return await this.attachmentModel.insertMany(attachments);
    }
}