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

'use strict';

const DTP_COMPONENT_NAME = 'post';

const express = require('express');

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 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.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 populatePostYear (req, res, next, postYear) {
    try {
      res.locals.postYear = parseInt(postYear, 10);
      if (!res.locals.postYear || isNaN(res.locals.postYear)) {
        throw new Error('Invalid post year');
      }
      return next();
    } catch (error) {
      this.log.error('failed to populate post year', { postYear, error });
      return next(error);
    }
  }
  
  async populatePostMonth (req, res, next, postMonth) {
    try {
      res.locals.postMonth = parseInt(postMonth, 10);
      if (!res.locals.postMonth || isNaN(res.locals.postMonth) || (postMonth < 1) || (postMonth > 12)) {
        throw new Error('Invalid post month');
      }
      return next();
    } catch (error) {
      this.log.error('failed to populate post month', { postMonth, error });
      return next(error);
    }
  }
  
  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 getView (req, res) {
    res.render('post/view');
  }

  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;
};