STUDIP.domReady(() => {
    var cache = STUDIP.Search.getCache();
    // initially hide all filters except for the semester filter
    $('#reset-search').hide();
    STUDIP.Search.hideAllFilters();
    $('div#semester_filter').show();
    STUDIP.Search.setActiveCategory('show_all_categories');
    STUDIP.Search.showActiveFilters(STUDIP.Search.getFilter());

    // searchterm and category can be passed by URL parameters (e.g. through the quicksearch)
    var searchterm = $('#search-results').data('searchterm');
    var category = $('#search-results').data('category') || location.hash.slice(1);
    if(searchterm) {
        cache.set('searchterm', searchterm);
        if (category) {
            STUDIP.Search.setActiveCategory(category);
        }
    }

    // Clear search term
    $('#reset-search').on('click', function () {
        STUDIP.Search.resetSearch();
        return false;
    });

    // Start search on Enter
    $('#search-input').on('keypress', function (e) {
        if (e.which === 13) {
            STUDIP.Search.doSearch(STUDIP.Search.getFilter());
            return false;
        }
    });

    // Delegate events on sidebar categories so we don't have to bind them
    // one by one (probably needs some work...) TODO refactor
    $('a[id^="search_category"]').on('click', function () {
        var category = this.id.substr(this.id.lastIndexOf('_') + 1, this.id.length);
        var old_category = cache.get('search_category');
        STUDIP.Search.showAllCategories(old_category);
        STUDIP.Search.toggleLinkText(old_category);
        cache.set('search_category', category);
        STUDIP.Search.showAllCategories(category);
        STUDIP.Search.expandCategory(category);
        STUDIP.Search.toggleLinkText(category);
        STUDIP.Search.setActiveCategory(category);
        STUDIP.Search.showActiveFilters(STUDIP.Search.getFilter());
        return false;
    });

    // click on 'Alle Ergebnisse'
    $('a#show_all_categories').on('click', function() {
        var category = cache.get('search_category');
        STUDIP.Search.toggleLinkText(category);
        STUDIP.Search.showAllCategories(category);
        if (!STUDIP.Search.resultsInCategory) {
            STUDIP.Search.resetFilters();
        }
    });

    // perform a new search when another filter is selected by the user
    $('#globalsearch-page select[id$="_select"]').on('change', function () {
        STUDIP.Search.showActiveFilters(STUDIP.Search.getFilter());
        STUDIP.Search.doSearch(STUDIP.Search.getFilter());
        return false;
    }).closest('form').on('submit', function(e) {
        e.preventDefault();
    });

    // set main search bar if a searchterm was typed in before
    $('#search-input').val(function() {
        if (cache.get('searchterm')) {
            STUDIP.Search.doSearch(STUDIP.Search.getFilter());
            if (cache.get('search_category')) {
                STUDIP.Search.setActiveCategory(cache.get('search_category'));
            }
        }
        return cache.get('searchterm');
    });

    // Delegate events on result container so we don't have to bind them
    // one by one
    $('#search-results').on('click', '.search-category a', function () {
        var category = $(this).closest('.search-category').data('category');
        STUDIP.Search.toggleLinkText(category);
        STUDIP.Search.expandCategory(category);
        STUDIP.Search.setActiveCategory(category);
        return false;
    });

    // Start searching 500 ms after user stopped typing.
    $('#search-input').keyup(_.debounce(function () {
        if ($('#search-input').val().trim().length >= STUDIP.Search.searchTermLength) {
            STUDIP.Search.doSearch(STUDIP.Search.getFilter());
        }
    }, 500));

    // Click on search button
    $('#search-btn').click(function () {
        STUDIP.Search.doSearch(STUDIP.Search.getFilter());
        return false;
    });

    // Event driven history changes
    var history_timeout;
    $(document).on('searched.studip search-category-change.studip', function (event, info) {
        let url = location.href.split('#')[0];

        if (info.category && info.category !== 'show_all_categories') {
            url += `#${info.category}`;
        }
        url = STUDIP.URLHelper.getURL(url, {
            q: info.needle || cache.get('searchterm')
        });

        // We need to put the history change on a timeout since category changes
        // occur more than once in a short period of time
        clearTimeout(history_timeout);
        history_timeout = setTimeout(() => {
            if (location.href !== url) {
                history.pushState({
                    needle: info.needle || STUDIP.Search.getCache().get('searchterm'),
                    category: info.category
                }, '', url)
            }
        }, 50);
    });
    $(window).on('popstate', function (event) {
        if (!event.originalEvent.state) {
            return;
        }

        let state = event.originalEvent.state;

        if (state.category) {
            if (state.category === 'show_all_categories') {
                $('a#show_all_categories').click();
            } else {
                $(`a#search_category_${state.category}`).click();
            }
        }
        if (state.needle && state.needle !== STUDIP.Search.getCache().get('searchterm')) {
            $('#search-input').val(state.needle);
            STUDIP.Search.doSearch(STUDIP.Search.getFilter());
        }
    })
});