'use strict';

const Service = require('egg').Service;
const assert = require('assert');
const moment = require('moment');
const { v1: uuidv1 } = require('uuid');
const fs = require('fs');
const path = require('path');
const fsPromises = fs.promises;
class FilesService extends Service {
  async create({ name, path }) {
    assert(name, '名称不存在');
    assert(path, '路径不存在');
    const { Files: model } = this.ctx.model;
    const createAt = moment().format('x');
    try {
      await model.create({ name, path, createAt });
      return { errmsg: '', errcode: 0 };
    } catch (error) {
      throw new Error({ errcode: -2001, errmsg: '添加失败' });
    }
  }
  async update({ name, path, id }) {
    assert(id, 'id不存在');
    const { Files: model } = this.ctx.model;
    try {
      await model.findByIdAndUpdate(id, { name, path });
      return { errmsg: '', errcode: 0 };
    } catch (error) {
      throw new Error({ errcode: -2001, errmsg: '修改失败' });
    }
  }
  async del({ id }) {
    assert(id, 'id不存在');
    const { Files: model } = this.ctx.model;
    try {
      // 获取文件路径
      const files = await model.findById(id);
      const filepath = `${files.path}`;
      // 开始删除文件
      await fsPromises.rmdir(filepath);
      await model.findOneAndDelete(id);
      return { errmsg: '', errcode: 0 };
    } catch (error) {
      throw new Error({ errcode: -2001, errmsg: '删除失败' });
    }
  }
  async query({ skip, limit, filter }) {
    const { Files: model } = this.ctx.model;
    try {
      let res;
      if (skip && limit) {
        res = await model.find(filter).skip(skip * limit).limit(limit);
      } else {
        res = await model.find(filter);
      }
      return { errmsg: '', errcode: 0, data: res };
    } catch (error) {
      throw new Error({ errcode: -2001, errmsg: '查询失败' });
    }
  }
  async upload({ type }) {
    try {
      const stream = await this.ctx.getFileStream();
      // 创建文件存储名称
      const filename = stream.filename;
      const index = filename.indexOf('.');
      const fileType = filename.slice(index, filename.length);
      const uuid = uuidv1();
      const paths = path.join(this.app.baseDir, `/app/public/${type === 'files' ? 'files' : 'resource'}/${uuid}${fileType}`);
      // 存储
      const remoteFileStream = fs.createWriteStream(paths);
      stream.pipe(remoteFileStream);
      return { errmsg: '', errcode: 0, data: { name: filename, path: paths } };
    } catch (error) {
      throw new Error({ errcode: -2001, errmsg: '上传失败' });
    }
  }
}

module.exports = FilesService;