'use strict';

var async = require('async');
var validator = require('validator');

var meta = require('../meta');
var plugins = require('../plugins');
var search = require('../search');
var categories = require('../categories');
var pagination = require('../pagination');
var privileges = require('../privileges');
var helpers = require('./helpers');

var searchController = module.exports;

searchController.search = function (req, res, next) {
	if (!plugins.hasListeners('filter:search.query')) {
		return next();
	}
	var page = Math.max(1, parseInt(req.query.page, 10)) || 1;

	const searchOnly = parseInt(req.query.searchOnly, 10) === 1;

	async.waterfall([
		function (next) {
			privileges.global.can('search:content', req.uid, next);
		},
		function (allowed, next) {
			if (!allowed) {
				return helpers.notAllowed(req, res);
			}

			if (req.query.categories && !Array.isArray(req.query.categories)) {
				req.query.categories = [req.query.categories];
			}
			if (req.query.hasTags && !Array.isArray(req.query.hasTags)) {
				req.query.hasTags = [req.query.hasTags];
			}

			var data = {
				query: req.query.term,
				searchIn: req.query.in || 'posts',
				matchWords: req.query.matchWords || 'all',
				postedBy: req.query.by,
				categories: req.query.categories,
				searchChildren: req.query.searchChildren,
				hasTags: req.query.hasTags,
				replies: req.query.replies,
				repliesFilter: req.query.repliesFilter,
				timeRange: req.query.timeRange,
				timeFilter: req.query.timeFilter,
				sortBy: req.query.sortBy || meta.config.searchDefaultSortBy || '',
				sortDirection: req.query.sortDirection,
				page: page,
				itemsPerPage: req.query.itemsPerPage,
				uid: req.uid,
				qs: req.query,
			};

			async.parallel({
				categories: async.apply(buildCategories, req.uid, searchOnly),
				search: async.apply(search.search, data),
			}, next);
		},
		function (results) {
			var searchData = results.search;

			searchData.pagination = pagination.create(page, searchData.pageCount, req.query);
			searchData.multiplePages = searchData.pageCount > 1;
			searchData.search_query = validator.escape(String(req.query.term || ''));
			searchData.term = req.query.term;

			if (searchOnly) {
				return res.json(searchData);
			}

			results.categories = results.categories.filter(category => category && !category.link);

			var categoriesData = [
				{ value: 'all', text: '[[unread:all_categories]]' },
				{ value: 'watched', text: '[[category:watched-categories]]' },
			].concat(results.categories);


			searchData.categories = categoriesData;
			searchData.categoriesCount = Math.max(10, Math.min(20, categoriesData.length));
			searchData.breadcrumbs = helpers.buildBreadcrumbs([{ text: '[[global:search]]' }]);
			searchData.expandSearch = !req.query.term;

			searchData.showAsPosts = !req.query.showAs || req.query.showAs === 'posts';
			searchData.showAsTopics = req.query.showAs === 'topics';
			searchData.title = '[[global:header.search]]';

			searchData.searchDefaultSortBy = meta.config.searchDefaultSortBy || '';
			res.render('search', searchData);
		},
	], next);
};

function buildCategories(uid, searchOnly, callback) {
	if (searchOnly) {
		return setImmediate(callback, null, []);
	}
	categories.buildForSelect(uid, 'read', callback);
}