$(document).ready(function() {

    // Process any GET params set
    var filterableQueryString = false;
    var urlVars = getUrlVars();

    if (urlVars.length > 0) {
        if (urlVars.indexOf('country') > -1) {
            if ($('#country option[value="' + urlVars['country'] + '"]').length > 0) {
                $('#country').val(urlVars['country']);
                filterableQueryString = true;
            }
        }

        if (urlVars.indexOf('category') > -1) {
            if ($('#category option[value="' + urlVars['category'] + '"]').length > 0) {
                $('#category').val(urlVars['category']);
                filterableQueryString = true;
            }
        }

        if (urlVars.indexOf('search') > -1) {
            $('#search').val(urlVars['search']);
            filterableQueryString = true;
        }

        if (filterableQueryString) {
            applyFilterChange();
        }
    }

    $('#sort').on('change', function() {

        var sortBy = $(this).val();
        var itemsArray = [];

        $('.exhibitor-column').each(function() {
            itemsArray.push($(this));
        });

        itemsArray.sort(function(a, b) {
            if (sortBy == 'stand_number') {
                if (a.data('stand') === b.data('stand')) {
                    return 0;
                } else if (a.data('stand') > b.data('stand')) {
                    return 1;
                } else {
                    return -1;
                }
            }

            if (sortBy == 'company_name') {
                if (a.data('company') === b.data('company')) {
                    return 0;
                } else if (a.data('company') > b.data('company')) {
                    return 1;
                } else {
                    return -1;
                }
            }

            if (sortBy == 'country') {
                if(a.data('country') === b.data('country')) {
                    return 0;
                } else if (a.data('country') > b.data('country')) {
                    return 1;
                } else {
                    return -1;
                }
            }
        });

        for (i = 0; i < itemsArray.length; ++i) {
            $('#sortable').append(itemsArray[i]);
        }

        applyFilterChange();

    });

    $('#country, #category').on('change', function() {
        applyFilterChange();
    });

    $('#search').on('search input', function() {
        applyFilterChange();
    });

    function applyFilterChange()
    {
        // Show all
        $('.exhibitor-column').show();
        $('#messages').text('').hide();

        // Limit by country
        var country = $('#country').val();

        if (country != 0) {
            $('.exhibitor-column').each(function() {
                var exhibCountry = $(this).data('country');

                if (country != exhibCountry) {
                    $(this).hide();
                }
            });
        }

        var visibleExhibitors = recalculateVisibleExhibitors();

        // Limit by category
        var category = $('#category').val();

        if (category != 0) {
            $(visibleExhibitors).each(function() {
                var categories = $(this).data('categories').toString();
                var categoryArray = categories.split('|');

                if (categoryArray.indexOf(category) == -1) {
                    $(this).hide();
                }
            });
        }

        visibleExhibitors = recalculateVisibleExhibitors();

        // Limit by free text search
        var search = $('#search').val().toLowerCase();

        if (search) {
            $(visibleExhibitors).each(function() {
                var textContent = $(this).text().toLowerCase();

                if (textContent.indexOf(search) === -1) {
                    $(this).hide();
                }
            });
        }

        // Reset rows/columns
        $('.clearfix').remove();
        var columnCount = 0;

        $('.exhibitor-column').each(function() {
            if ($(this).is(':visible')) {
                columnCount++;

                if (columnCount % 3 == 0) {
                    $(this).after('<div class="clearfix"></div>');
                }
            }
        });

        visibleExhibitors = recalculateVisibleExhibitors();

        // Display "no results" message on empty list
        if (!visibleExhibitors.length) {
            $('#messages').html('<em>There are no search results.</em>').show();
        }
    }

    function recalculateVisibleExhibitors()
    {
        return $('.exhibitor-column').filter(':visible');
    }

    function getUrlVars()
    {
        var vars = [], hash;
        var hashes = window.location.href.slice(
            window.location.href.indexOf('?') + 1
        ).split('&');

        for (var i = 0; i < hashes.length; i++) {
            hash = hashes[i].split('=');
            vars.push(hash[0]);
            vars[hash[0]] = decodeURIComponent(hash[1]);
        }

        return vars;
    }

});