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

'use strict';

const DTP_COMPONENT_NAME = 'post';

const express = require('express');
const multer = require('multer');

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

class PostController extends SiteController {

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

  async start ( ) {
    const { dtp } = this;
    const { limiter: limiterService } = dtp.services;

    const upload = multer({ dest: `/tmp/dtp-sites/${this.dtp.config.site.domainKey}`});

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

    router.use(this.dtp.services.gabTV.channelMiddleware('mrjoeprich'));
    router.use(async (req, res, next) => {
      res.locals.currentView = 'home';
      return next();
    });

    router.param('postSlug', this.populatePostSlug.bind(this));

    router.post('/:postSlug/comment', upload.none(), this.postComment.bind(this));

    router.get('/:postSlug',
      limiterService.create(limiterService.config.post.getView),
      this.getView.bind(this),
    );

    router.get('/',
      limiterService.create(limiterService.config.post.getIndex),
      this.getIndex.bind(this),
    );
  }

  async populatePostSlug (req, res, next, postSlug) {
    const { post: postService } = this.dtp.services;
    try {
      res.locals.post = await postService.getBySlug(postSlug);
      if (!res.locals.post) {
        throw new SiteError(404, 'Post not found');
      }
      return next();
    } catch (error) {
      this.log.error('failed to populate postSlug', { postSlug, error });
      return next(error);
    }
  }

  async postComment (req, res) {
    const {
      comment: commentService,
      displayEngine: displayEngineService,
    } = this.dtp.services;
    try {
      const displayList = displayEngineService.createDisplayList('add-recipient');

      res.locals.comment = await commentService.create(req.user, 'Post', res.locals.post, req.body);

      displayList.setInputValue('textarea#content', '');
      displayList.setTextContent('#comment-character-count', '0');

      let viewModel = Object.assign({ }, req.app.locals);
      viewModel = Object.assign(viewModel, res.locals);

      const html = await commentService.templates.comment(viewModel);
      displayList.addElement('ul#post-comment-list', 'afterBegin', html);

      displayList.showNotification(
        'Comment created',
        'success',
        'bottom-center',
        4000,
      );
      res.status(200).json({ success: true, displayList });
    } catch (error) {
      res.status(error.statusCode || 500).json({ success: false, message: error.message });
    }
  }

  async getView (req, res, next) {
    const { comment: commentService, resource: resourceService } = this.dtp.services;
    try {
      await resourceService.recordView(req, 'Post', res.locals.post._id);
      
      res.locals.pagination = this.getPaginationParameters(req, 20);
      res.locals.comments = await commentService.getForResource(
        res.locals.post,
        ['published', 'mod-warn'],
        res.locals.pagination,
      );

      res.render('post/view');
    } catch (error) {
      this.log.error('failed to service post view', { postId: res.locals.post._id, error });
      return next(error);
    }
  }

  async getIndex (req, res, next) {
    const { post: postService } = this.dtp.services;
    try {
      res.locals.pagination = this.getPaginationParameters(req, 20);
      res.locals.posts = await postService.getPosts(res.locals.pagination);
      res.render('post/index');
    } catch (error) {
      return next(error);
    }
  }
}

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