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

'use strict';

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

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

class NewsletterController extends SiteController {

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

  async start ( ) {
    const router = express.Router();
    router.use(async (req, res, next) => {
      res.locals.currentView = 'admin';
      res.locals.adminView = 'newsletter';
      return next();
    });

    router.param('newsletterId', this.populateNewsletterId.bind(this));

    router.post('/:newsletterId', this.postUpdateNewsletter.bind(this));
    router.post('/', this.postCreateNewsletter.bind(this));

    router.get('/compose', this.getComposer.bind(this));
    router.get('/:newsletterId', this.getComposer.bind(this));

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

    router.delete('/:newsletterId', this.deleteNewsletter.bind(this));

    return router;
  }

  async populateNewsletterId (req, res, next, newsletterId) {
    const { newsletter: newsletterService } = this.dtp.services;
    try {
      res.locals.newsletter = await newsletterService.getById(newsletterId);
      if (!res.locals.newsletter) {
        throw new SiteError(404, 'Newsletter not found');
      }
      return next();
    } catch (error) {
      this.log.error('failed to populate newsletterId', { newsletterId, error });
      return next(error);
    }
  }

  async postUpdateNewsletter (req, res, next) {
    const { newsletter: newsletterService } = this.dtp.services;
    try {
      await newsletterService.update(res.locals.newsletter, req.body);
      res.redirect('/admin/newsletter');
    } catch (error) {
      this.log.error('failed to update newsletter', { newletterId: res.locals.newsletter._id, error });
      return next(error);
    }
  }

  async postCreateNewsletter (req, res, next) {
    const { newsletter: newsletterService } = this.dtp.services;
    try {
      await newsletterService.create(req.user, req.body);
      res.redirect('/admin/newsletter');
    } catch (error) {
      this.log.error('failed to create newsletter', { error });
      return next(error);
    }
  }

  async getComposer (req, res) {
    res.render('admin/newsletter/editor');
  }

  async getIndex (req, res, next) {
    const { newsletter: newsletterService } = this.dtp.services;
    try {
      res.locals.pagination = this.getPaginationParameters(req, 20);
      res.locals.newsletters = await newsletterService.getNewsletters(res.locals.pagination, ['draft', 'published']);
      res.render('admin/newsletter/index');
    } catch (error) {
      return next(error);
    }
  }

  async deleteNewsletter (req, res) {
    const { newsletter: newsletterService, displayEngine: displayEngineService } = this.dtp.services;
    try {
      const displayList = displayEngineService.createDisplayList('delete-newsletter');

      await newsletterService.deleteNewsletter(res.locals.newsletter);

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

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