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

'use strict';

const DTP_COMPONENT_NAME = '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 { dtp } = this;
    const { limiter: limiterService, session: sessionService } = dtp.services;

    const upload = multer({ dest: `/tmp/${this.dtp.config.site.domainKey}/uploads/${DTP_COMPONENT_NAME}` });
    const authRequired = sessionService.authCheckMiddleware({ requireLogin: true });

    const router = express.Router();
    dtp.app.use('/link', router);

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

    router.use(async (req, res, next) => {
      res.locals.currentView = DTP_COMPONENT_NAME;
      return next();
    });

    router.post('/sort',
      limiterService.create(limiterService.config.link.postSortLinksList),
      authRequired,
      this.postSortLinksList.bind(this),
    );

    router.post('/:linkId',
      limiterService.create(limiterService.config.link.postUpdateLink),
      authRequired,
      upload.none(),
      this.postUpdateLink.bind(this),
    );

    router.post('/',
      limiterService.create(limiterService.config.link.postCreateLink),
      authRequired,
      upload.none(),
      this.postCreateLink.bind(this),
    );

    router.get('/:linkId/visit',
      limiterService.create(limiterService.config.link.getCreateLinkVisit),
      this.getCreateLinkVisit.bind(this),
    );

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

  async populateLinkId (req, res, next, linkId) {
    const { link: linkService } = this.dtp.services;
    try {
      res.locals.link = await linkService.getById(linkId);
      return next();
    } catch (error) {
      this.log.error('failed to populate link ID', { linkId, error });
      return next(error);
    }
  }

  async getCreateLinkVisit (req, res, next) {
    const { resource: resourceService } = this.dtp.services;
    try {
      this.log.info('recording link visit', { link: res.locals.link._id, ip: req.ip });

      await resourceService.recordView(req, 'Link', res.locals.link._id);

      res.redirect(res.locals.link.href); // off you go!
    } catch (error) {
      this.log.error('failed to create link', { error });
      return next(error);
    }
  }

  async postSortLinksList (req, res) {
    const { link: linkService } = this.dtp.services;
    try {
      const displayList = this.createDisplayList('sort-links-list');
      await linkService.setItemOrder(req.body.updateOps);
      displayList.showNotification(
        'List sort order updated',
        'success',
        'bottom-center',
        2000,
      );
      res.status(200).json({ success: true, displayList });
    } catch (error) {
      this.log.error('failed to create link', { error });
      return res.status(error.statusCode || 500).json({
        success: false,
        message: error.message,
      });
    }
  }

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

      if (!res.locals.link.user._id.equals(req.user._id)) {
        throw new SiteError(403, 'This is not your link');
      }
      await linkService.update(res.locals.link, req.body);

      const html = linkService.renderTemplate('link', { link: res.locals.link });
      displayList.replaceElement(`li[data-link-id="${res.locals.link._id}"]`, html);

      displayList.showNotification(
        'Link updated',
        'success',
        'bottom-center',
        2000,
      );

      res.status(200).json({ success: true, displayList });
    } catch (error) {
      this.log.error('failed to create link', { error });
      return res.status(error.statusCode || 500).json({
        success: false,
        message: error.message,
      });
    }
  }

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

      res.locals.link = await linkService.create(req.user, req.body);

      const html = linkService.renderTemplate('link', { link: res.locals.link });
      displayList.addElement('ul#links-list', 'afterBegin', html);
      displayList.showNotification(
        'Link created',
        'success',
        'bottom-center',
        2000,
      );
      res.status(200).json({ success: true, displayList });
    } catch (error) {
      this.log.error('failed to create link', { error });
      return res.status(error.statusCode || 500).json({
        success: false,
        message: error.message,
      });
    }
  }

  async deleteLink (req, res, next) {
    const { link: linkService } = this.dtp.services;
    try {
      const displayList = this.createDisplayList('update-link');
      if (!res.locals.link.user._id.equals(req.user._id)) {
        throw new SiteError(403, 'This is not your link');
      }
      await linkService.remove(res.locals.link);

      displayList.removeElement(`li[data-link-id="${res.locals.link._id}"]`);
      displayList.showNotification(
        'Link removed',
        'success',
        'bottom-center',
        2000,
      );
      res.status(200).json({ success: true, displayList });
    } catch (error) {
      this.log.error('failed to remove link', { linkId: res.locals.link._id, error });
      return next(error);
    }
  }
}

module.exports = {
  slug: 'link',
  name: 'link',
  create: async (dtp) => {
    let controller = new LinkController(dtp);
    return controller;
  },
};