'use strict';

const fs = require('fs');
const { extname, sep } = require('path');
const moment = require('moment');
const awaitWriteStream = require('await-stream-ready').write;
const sendToWormhole = require('stream-wormhole');
const Service = require('egg').Service;
class FilestoreService extends Service {
  constructor(ctx) {
    super(ctx);
    this.model = this.ctx.model.Filestore;
  }
  async upload({ app }) {
    const stream = await this.ctx.getFileStream();
    const rootPath = `${this.app.config.repos_root_path}`;
    // 检查路径是否存在，不存在则创建
    if (!fs.existsSync(`${rootPath}/${app}`)) {
      fs.mkdirSync(`${rootPath}/${app}`);
    }
    // 后缀名
    const ext = extname(stream.filename).toLowerCase();
    // 制作时间串
    const name = moment().format('YYYYMMDDHHmmss');
    // 定义文件名与路径
    const fileName = `${name}${ext}`;
    const filePath = `${rootPath}${sep}${app}${sep}`;
    const writeStream = fs.createWriteStream(filePath + fileName);
    try {
      await awaitWriteStream(stream.pipe(writeStream));
      if (this.app.config.data_save) {
        return await this.create({ fileName, filePath: `/upload/${app}/${fileName}`, name: stream.filename });
      }
      const data = { fileName, filePath, name: stream.filename };
      return { errcode: 0, errmsg: 'ok', data };
    } catch (error) {
      await sendToWormhole(stream);
      throw error;
    }
  }
  async create({ fileName, filePath, name }) {
    try {
      const res = await this.model.create({ fileName, filePath, name });
      return { errcode: 0, errmsg: 'ok', data: res };
    } catch (error) {
      throw error;
    }
  }
  async delete({ fileName, filePath }) {
    try {
      const file = await fs.existsSync(`${filePath}${fileName}`, exists => {
        console.log(exists, 'exists');
        if (!exists) throw { errcode: -1001, errmsg: '文件不存在' };
      });
      if (file) {
        fs.unlink(`${filePath}${fileName}`, err => {
          if (err) throw { errcode: -2001, errmsg: err };
        });
        await this.model.remove({ fileName });
        return { errcode: 0, errmsg: 'ok' };
      }
      return { errcode: -1001, errmsg: '文件不存在' };
    } catch (error) {
      throw error;
    }
  }
  async query({ skip, limit, fileName, name }) {
    try {
      const filter = {};
      if (name || fileName) filter.$or = [];
      if (fileName) filter.$or.push({ code: { $regex: fileName } });
      if (name) filter.$or.push({ name: { $regex: name } });
      let res;
      const total = await this.model.find({ ...filter });
      if (skip && limit) {
        res = await this.model.find({ ...filter }).skip(Number(skip) * Number(limit)).limit(Number(limit));
      } else {
        res = await this.model.find({ ...filter });
      }
      return { errcode: 0, errmsg: 'ok', data: res, total: total.length };
    } catch (error) {
      throw error;
    }
  }
  // 文件下载
  async filesDownload({ filePath }) {
    const rootPath = `${this.app.config.root_path}`;
    const res = await this.model.findOne({ filePath });
    const url = `${rootPath}${filePath}`;
    const postfix = url.split('.')[1];
    this.ctx.attachment(`${res.name}.${postfix}`);
    // this.ctx.set('Content-Type', 'application/octet-stream');
    return fs.createReadStream(url);
  }
}

module.exports = FilestoreService;