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

'use strict';

const DTP_COMPONENT_NAME = 'dashboard';

const express = require('express');

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

class DashboardController extends SiteController {

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

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

    const authRequired = sessionService.authCheckMiddleware({ requireLogin: true });

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

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

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

    router.get('/link/:linkId',
      limiterService.create(limiterService.config.dashboard.getLinkView),
      authRequired,
      this.getLinkView.bind(this),
    );

    router.get('/',
      limiterService.create(limiterService.config.dashboard.getDashboardView),
      authRequired,
      this.getDashboardView.bind(this),
    );
  }

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

  async getLinkView (req, res, next) {
    const { dashboard: dashboardService, link: linkService } = this.dtp.services;
    try {
      res.locals.linkVisitStats = await dashboardService.getLinkVisitStats(res.locals.link);
      res.locals.linkCountryStats = await dashboardService.getLinkCountryStats(res.locals.link);
      res.locals.linkCityStats = await dashboardService.getLinkCityStats(res.locals.link);

      res.locals.userLinks = await linkService.getForUser(req.user);

      res.render('dashboard/link-analyzer');
    } catch (error) {
      this.log.error('failed to display dashboard', { userId: req.user._id, error });
      return next(error);
    }
  }

  async getDashboardView (req, res, next) {
    const { dashboard: dashboardService, link: linkService } = this.dtp.services;
    try {
      res.locals.profileVisitStats = await dashboardService.getResourceVisitStats('User', req.user._id);
      res.locals.linkVisitStats = await dashboardService.getUserVisitStats(req.user);

      res.locals.userLinks = await linkService.getForUser(req.user);
      res.locals.linkCountryStats = await dashboardService.getUserCountryStats(req.user);
      res.locals.linkCityStats = await dashboardService.getUserCityStats(req.user);

      res.render('dashboard/view');
    } catch (error) {
      this.log.error('failed to display dashboard', { userId: req.user._id, error });
      return next(error);
    }
  }
}

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