module.exports = function registerScreensRoutes(app, deps) {
  const pool = deps.pool;
  const common = deps.common;
  const pages = deps.pages;
  const buildDashboardState = deps.buildDashboardState;
  const { buildPagination } = require('../../../lib/pagination');
  const requirePermission = deps.requirePermission;

  const LIST_PAGE_SIZE = 10;

  function requireQueryPermission(readPermissionKey, editPermissionKey) {
    return function (req, res, next) {
      const permissionKey = req.query && req.query.edit ? editPermissionKey : readPermissionKey;
      return requirePermission(permissionKey)(req, res, next);
    };
  }

  function applyConnectionCounts(screens, dashboardScreens) {
    const countsById = new Map();
    const countsBySlug = new Map();

    (dashboardScreens || []).forEach(function (screen) {
      const count = Number(screen && screen.player_connection_count || 0);
      const id = screen && screen.id !== undefined && screen.id !== null ? String(screen.id) : '';
      const slug = String(screen && screen.slug || '').trim();

      if (id) {
        countsById.set(id, count);
      }
      if (slug) {
        countsBySlug.set(slug, count);
      }
    });

    return (screens || []).map(function (screen) {
      const slug = String(screen && screen.slug || '').trim();
      const id = screen && screen.id !== undefined && screen.id !== null ? String(screen.id) : '';
      const playerConnectionCount = countsBySlug.has(slug)
        ? countsBySlug.get(slug)
        : countsById.get(id) || 0;

      return Object.assign({}, screen, {
        player_connection_count: playerConnectionCount
      });
    });
  }

  app.get('/screens', requireQueryPermission('screens.read', 'screens.update'), async function (req, res, next) {
    try {
      if (req.query.edit) {
        const screen = await common.fetchScreenById(pool, Number(req.query.edit));
        if (!screen) {
          return res.status(404).send('Screen not found');
        }
        const editData = await common.fetchScreenEditData(pool);
        return res.send(pages.renderScreenEditPage(screen, editData, req.query.message ? String(req.query.message) : '', req.currentUser));
      }
      const page = Math.max(1, Math.floor(Number(req.query.page) || 1));
      const search = common.getSearchQuery(req);
      const sort = common.getSortQuery(req);
      const direction = common.getSortDirectionQuery(req);
      const dashboardState = await buildDashboardState(pool);
      const data = await common.fetchScreensPage(pool, page, LIST_PAGE_SIZE, search, sort, direction);
      res.send(pages.renderScreensPage({
        screens: applyConnectionCounts(data.screens || [], dashboardState.screens || []),
        pagination: buildPagination(data.totalItems, data.currentPage, 'page', { search: search, sort: sort, direction: direction }, LIST_PAGE_SIZE, 'screens', 'Screen pages')
      }, req.query.message ? String(req.query.message) : '', req.currentUser));
    } catch (error) {
      next(error);
    }
  });

  app.get('/screens/:id/edit', requirePermission('screens.update'), async function (req, res, next) {
    try {
      const screen = await common.fetchScreenById(pool, Number(req.params.id));
      if (!screen) {
        return res.status(404).send('Screen not found');
      }
      const editData = await common.fetchScreenEditData(pool);
      return res.send(pages.renderScreenEditPage(screen, editData, req.query.message ? String(req.query.message) : '', req.currentUser));
    } catch (error) {
      next(error);
    }
  });
};