// admin/link.js
// Copyright (C) 2021 Digital Telepresence, LLC
// License: Apache-2.0

'use strict';

const DTP_COMPONENT_NAME = 'admin:link';
const express = require('express');

const multer = require('multer');

const { SiteController, SiteError } = require('../../../lib/site-lib');

class LinkController extends SiteController {

  constructor (dtp) {
    super(dtp, DTP_COMPONENT_NAME);
  }

  async start ( ) {
    const router = express.Router();
    const upload = multer({ dest: `/tmp/${this.dtp.config.domainKey}/uploads`});

    router.use(async (req, res, next) => {
      res.locals.currentView = 'admin';
      res.locals.adminView = 'link';
      return next();
    });

    router.param('linkId', this.populateLinkId.bind(this));

    router.post('/:linkId', upload.none(), this.postUpdateLink.bind(this));

    router.get('/:linkId', this.getLinkView.bind(this));
    router.get('/', this.getIndex.bind(this));

    router.delete('/:linkId', this.deleteLink.bind(this));

    return router;
  }

  async populateLinkId (req, res, next, linkId) {
    const { link: linkService } = this.dtp.services;
    try {
      res.locals.link = await linkService.getById(linkId);
      if (!res.locals.link) {
        throw new SiteError(404, 'Link not found');
      }
      return next();
    } catch (error) {
      this.log.error('failed to populate linkId', { linkId, error });
      return next(error);
    }
  }

  async postUpdateLink (req, res) {
    const { link: linkService } = this.dtp.services;
    try {
      const displayList = this.createDisplayList('update-link');

      await linkService.update(res.locals.link, req.body);

      displayList.showNotification(
        `Link ${res.locals.link.label} updated successfully`,
        'success', 'bottom-center', 2000,
      );
      res.status(200).json({ success: true, displayList });
    } catch (error) {
      this.log.error('failed to update link', { linkId: res.locals.link._id, error });
      return res.status(error.statusCode || 500).json({
        success: false,
        message: error.message,
      });
    }
  }

  async getLinkView (req, res) {
    res.render('admin/link/editor');
  }

  async getIndex (req, res, next) {
    const { link: linkService } = this.dtp.services;
    try {
      res.locals.totalLinkCount = await linkService.getTotalCount();
      res.locals.pagination = this.getPaginationParameters(req, 50);
      res.locals.links = await linkService.getAdmin(res.locals.pagination);
      res.render('admin/link/index');
    } catch (error) {
      this.log.error('failed to fetch links', { error });
      return next(error);
    }
  }

  async deleteLink (req, res) {
    const { link: linkService } = this.dtp.services;
    try {
      const displayList = this.createDisplayList('delete-link');

      await linkService.remove(res.locals.link);

      displayList.removeElement(`li[data-link-id="${res.locals.link._id}"]`);
      displayList.showNotification(
        `Link "${res.locals.link.title}" deleted`,
        'success',
        'bottom-center',
        3000,
      );
      res.status(200).json({ success: true, displayList });
    } catch (error) {
      this.log.error('failed to delete link', {
        linkId: res.local.link._id,
        error,
      });
      res.status(error.statusCode || 500).json({
        success: false,
        message: error.message,
      });
    }
  }
}

module.exports = async (dtp) => {
  let controller = new LinkController(dtp);
  return controller;
};