(function ($) {
    $.fn.ySelect = function (options) {
        var defaultOptions = {
            placeholder: '请选择',
            numDisplayed: 4,
            overflowText: '{n} selected',
            searchText: '搜索',
            showSearch: true
        }
        if (typeof options == 'string') {
            var settings = options;
        } else {
            var settings = $.extend(true, {}, defaultOptions, options);
        }

        function ySelect(select, settings) {
            this.$select = $(select);
            this.settings = settings;
            this.create();
        }

        ySelect.prototype = {
            create: function () {
                var multiple = this.$select.is('[multiple]') ? ' multiple' : '';
                this.$select.wrap('<div class="fs-wrap' + multiple + '"></div>');
                this.$select.before('<div class="fs-label-wrap"><div class="fs-label">' + this.settings.placeholder + '</div><span class="fs-arrow"></span></div>');
                this.$select.before('<div class="fs-dropdown hidden"><div class="fs-options"></div></div>');
                this.$select.before('<div class="close"><i>+</i></div>');
                this.$select.addClass('hidden');
                this.$wrap = this.$select.closest('.fs-wrap');
                this.reload();
            }, reload: function () {
                if (this.settings.showSearch) {
                    var search = '<div class="fs-search"><input type="search" placeholder="' + this.settings.searchText + '" /><span class="fs-selectAll"><i class="fa fa-check-square-o"></i></span></div>';
                    this.$wrap.find('.fs-dropdown').prepend(search);
                }
                var choices = this.buildOptions(this.$select);
                this.$wrap.find('.fs-options').html(choices);
                this.reloadDropdownLabel();
            }, destroy: function () {
                this.$wrap.find('.fs-label-wrap').remove();
                this.$wrap.find('.fs-dropdown').remove();
                this.$select.unwrap().removeClass('hidden');
            }, buildOptions: function ($element) {
                var $this = this;
                var choices = '';
                $element.children().each(function (i, el) {
                    var $el = $(el);
                    if ('optgroup' == $el.prop('nodeName').toLowerCase()) {
                        choices += '<div class="fs-optgroup">';
                        choices += '<div class="fs-optgroup-label">' + $el.prop('label') + '</div>';
                        choices += $this.buildOptions($el);
                        choices += '</div>';
                    } else {
                        var selected = $el.is('[selected]') ? ' selected' : '';
                        choices += '<div class="fs-option' + selected + '" data-value="' + $el.prop('value') + '"><span class="fs-checkbox"><i></i></span><div class="fs-option-label">' + $el.html() + '</div></div>';
                    }
                });
                return choices;
            }, reloadDropdownLabel: function () {
                var settings = this.settings;
                var labelText = [];
                this.$wrap.find('.fs-option.selected').each(function (i, el) {
                    labelText.push($(el).find('.fs-option-label').text());
                });
                if (labelText.length < 1) {
                    labelText = settings.placeholder;
                } else if (labelText.length > settings.numDisplayed) {
                    labelText = settings.overflowText.replace('{n}', labelText.length);
                } else {
                    labelText = labelText.join(', ');
                }
                this.$wrap.find('.fs-label').html(labelText);
                this.$select.change();
            }, setwrap: function () {
                return "123";
            },
        }
        return this.each(function () {
            var data = $(this).data('ySelect');
            if (!data) {
                data = new ySelect(this, settings);
                $(this).data('ySelect', data);
            }
            if (typeof settings == 'string') {
                data[settings]();
            }
        });
    }
    window.ySelect = {'active': null, 'idx': -1};

    function setIndexes($wrap) {
        $wrap.find('.fs-option:not(.hidden)').each(function (i, el) {
            $(el).attr('data-index', i);
            $wrap.find('.fs-option').removeClass('hl');
        });
        $wrap.find('.fs-search input').focus();
        window.ySelect.idx = -1;
    }

    function setScroll($wrap) {
        var $container = $wrap.find('.fs-options');
        var $selected = $wrap.find('.fs-option.hl');
        var itemMin = $selected.offset().top + $container.scrollTop();
        var itemMax = itemMin + $selected.outerHeight();
        var containerMin = $container.offset().top + $container.scrollTop();
        var containerMax = containerMin + $container.outerHeight();
        if (itemMax > containerMax) {
            var to = $container.scrollTop() + itemMax - containerMax;
            $container.scrollTop(to);
        } else if (itemMin < containerMin) {
            var to = $container.scrollTop() - containerMin - itemMin;
            $container.scrollTop(to);
        }
    }

    $(document).on('click', '.fs-selectAll', function () {
        $(this).parent().next().find('.fs-option.selected').click();
        $(this).parent().next().find('.fs-option').click();
        $(this).addClass('selected');
    });
    $(document).on('click', '.fs-selectAll.selected', function () {
        $(this).parent().next().find('.fs-option.selected').click();
        $(this).removeClass('selected');
    });
    $(document).on('click', '.fs-option', function () {
        var $wrap = $(this).closest('.fs-wrap');
        if ($wrap.hasClass('multiple')) {
            var selected = [];
            $(this).toggleClass('selected');
            $wrap.find('.fs-option.selected').each(function (i, el) {
                selected.push($(el).attr('data-value'));
            });
        } else {
            var selected = $(this).attr('data-value');
            $wrap.find('.fs-option').removeClass('selected');
            $(this).addClass('selected');
            $wrap.find('.fs-dropdown').hide();
        }
        $wrap.find('select').val(selected);
        $wrap.find('select').ySelect('reloadDropdownLabel');
        $wrap.find('select').ySelect('setwrap');
    });
    $(document).on('keyup', '.fs-search input', function (e) {
        if (40 == e.which) {
            $(this).blur();
            return;
        }
        var $wrap = $(this).closest('.fs-wrap');
        var keywords = $(this).val();
        $wrap.find('.fs-option, .fs-optgroup-label').removeClass('hidden');
        if ('' != keywords) {
            $wrap.find('.fs-option').each(function () {
                var regex = new RegExp(keywords, 'gi');
                if (null === $(this).find('.fs-option-label').text().match(regex)) {
                    $(this).addClass('hidden');
                }
            });
            $wrap.find('.fs-optgroup-label').each(function () {
                var num_visible = $(this).closest('.fs-optgroup').find('.fs-option:not(.hidden)').length;
                if (num_visible < 1) {
                    $(this).addClass('hidden');
                }
            });
        }
        setIndexes($wrap);
    });
    $(document).on('click', function (e) {
        var $el = $(e.target);
        var $wrap = $el.closest('.fs-wrap');
        if (0 < $wrap.length) {
            if ($el.hasClass('fs-label') || $el.hasClass('fs-arrow')) {
                window.ySelect.active = $wrap;
                var is_hidden = $wrap.find('.fs-dropdown').hasClass('hidden');
                $('.fs-dropdown').addClass('hidden');
                if (is_hidden) {
                    $wrap.find('.fs-dropdown').removeClass('hidden');
                } else {
                    $wrap.find('.fs-dropdown').addClass('hidden');
                }
                setIndexes($wrap);
            }
        } else {
            $('.fs-dropdown').addClass('hidden');
            window.ySelect.active = null;
        }
    });
    $(document).on('keydown', function (e) {
        var $wrap = window.ySelect.active;
        if (null === $wrap) {
            return;
        } else if (38 == e.which) {
            e.preventDefault();
            $wrap.find('.fs-option').removeClass('hl');
            if (window.ySelect.idx > 0) {
                window.ySelect.idx--;
                $wrap.find('.fs-option[data-index=' + window.ySelect.idx + ']').addClass('hl');
                setScroll($wrap);
            } else {
                window.ySelect.idx = -1;
                $wrap.find('.fs-search input').focus();
            }
        } else if (40 == e.which) {
            e.preventDefault();
            var last_index = $wrap.find('.fs-option:last').attr('data-index');
            if (window.ySelect.idx < parseInt(last_index)) {
                window.ySelect.idx++;
                $wrap.find('.fs-option').removeClass('hl');
                $wrap.find('.fs-option[data-index=' + window.ySelect.idx + ']').addClass('hl');
                setScroll($wrap);
            }
        } else if (32 == e.which || 13 == e.which) {
            $wrap.find('.fs-option.hl').click();
        } else if (27 == e.which) {
            $('.fs-dropdown').addClass('hidden');
            window.ySelect.active = null;
        }
    });
    $.fn.ySelectedValues = function (splitString) {
        var result = "";
        var $selects = this.find("option:selected");
        for (var i = 0; i < $selects.length; i++) {
            result += $selects[i].value + ((i == $selects.length - 1) ? "" : splitString);
        }
        return result;
    }
    $.fn.ySelectedTexts = function (splitString) {
        var result = "";
        var $selects = this.find("option:selected");
        for (var i = 0; i < $selects.length; i++) {
            result += $selects[i].text + ((i == $selects.length - 1) ? "" : splitString);
        }
        return result;
    }
})(jQuery);