/*
 * @name jQuery.auto-suggest
 * @projectDescription AJAX auto-suggest for Bootstrap 3
 * @author  | https://github.com/androiddevelop/auto-suggest
 * @version 1.0
 * @license Apache License
 *
 */
(function ($) {
    $.fn.autosuggest = function (options) {
        var defaults = {
            url: "/search",
            method: 'get',
            wrapperClass: "as-wrapper",
            menuClass: "as-menu",
            minLength: 1,
            maxNum: 5,
            align: "left",
            queryParamName: 'query',
            split: null,
            highlight: true,
            extra: {},
            nextStep: null,
            open: null,
            close: null,
            immediate: false,
            data: null,
            firstSelected: false, //第一个被选中
            dataCallback: null, //接口数据转换方法
            dataType: 'json',
            onSelect: null, //选中项方法，返回选中项jQuery对象
            dataFun: null
        };

        var settings = $.extend({}, defaults, options);

        $(this).attr('autocomplete', 'off');
        $(this).wrap('<div class="' + settings.wrapperClass + '"></div>');

        $('<div class="' + settings.menuClass + ' list-group"></div>').insertAfter($(this));

        var xhr;
        var that = $(this);

        var alignClass = ' as-align-left';
        if (settings.align == 'center') {
            alignClass = ' as-align-center';
        } else if (settings.align == 'right') {
            alignClass = ' as-align-right';
        }

        $(".as-menu").css("top", $(that).outerHeight());

        var lastText = "";

        var lock = false;

        setInterval(checkInput, 200);


        //检测输入
        function checkInput() {
            var query = $(that).val();
            if (lock || query == lastText) {
                return;
            }

            lastText = query;

            if (query == null) {
                closeComponent($(that).next('.' + settings.menuClass));
                return;
            }

            if (query.length < settings.minLength) {
                closeComponent($(that).next('.' + settings.menuClass));
                return;
            }

            //处理分隔符,分隔符为最后一个字符时,隐藏建议框
            if (settings.split != null && query.charAt(query.length - 1) == settings.split) {
                $(that).next('.' + settings.menuClass).html('');
                closeComponent($(that).next('.' + settings.menuClass));
            }

            searchQuery();

        }

        //hide auto-suggest component when lose focus
        $(this).blur(function () {
            setTimeout(function () {
                closeComponent($(that).next('.' + settings.menuClass));
            }, 200);
        });

        //查询
        function searchQuery() {

            var query = $(that).val();

            var queryName = settings.queryParamName;



            if (!query) {
                $(that).next('.' + settings.menuClass).html('');
                closeComponent($(that).next('.' + settings.menuClass));
            }

            var json = settings.dataFun(query);

            if (settings.dataCallback) {
                json = settings.data = settings.dataCallback(json);
            }
            var results = '';

            var selectIndex = -1;
            var suggestionsNum = 0;

            $.each(json, function (i, j) {

                if (settings.maxNum > i) {
                    if (settings.highlight) {
                        // 结果展示
                        results += '<span href="javascript:void(0)" class="list-group-item ' + alignClass + '" data-id="' + j.id + '" data-value="' + j.value + '" data-label="'
                            + j.label + '">' + getStrongText(j.value, query) + ' <span class="sub-value">' + getStrongText(j.subvalue, query) + '</span></span>';
                    } else {
                        results += '<span href="javascript:void(0)" class="list-group-item ' + alignClass + '" data-id="' + j.id + '" data-value="' + j.value + '"  data-label="'
                            + j.label + '">' + j.value + ' <span class="sub-value">' + j.subvalue + '</span></span>';
                    }
                    suggestionsNum++;
                }
            });

            $(that).next('.' + settings.menuClass).html(results);
            $(that).next('.' + settings.menuClass).children().on("click", selectResult);

            //do not show when lose focus
            if ($(that).is(":focus")) {
                openComponent($(that).next('.' + settings.menuClass));
            }

            //close component when there is no data.
            if (suggestionsNum == 0 && $(that).next('.' + settings.menuClass).is(':visible') && settings.close != null) {
                closeComponent($(that).next('.' + settings.menuClass));
            }

            $(that).unbind("keydown");
            $(".as-selected").removeClass("as-selected");
            var upDownOperate = false;  //has up or down operate

            if (settings.firstSelected) {
                selectIndex = (selectIndex + 1) % suggestionsNum;
                $(that).next('.' + settings.menuClass).children().eq(selectIndex).addClass("as-selected");
                upDownOperate = true;
            }

            $(that).keydown(function (event) {
                var keyCode = event.keyCode;

                if ($(that).next('.' + settings.menuClass).css("display") == 'none' && keyCode != 13) {
                    return;
                }

                //up arrow
                if (keyCode == 38) {
                    $(".as-selected").removeClass("as-selected");
                    selectIndex = (selectIndex + suggestionsNum - 1) % suggestionsNum;
                    $(that).next('.' + settings.menuClass).children().eq(selectIndex).addClass("as-selected");
                    upDownOperate = true;

                    //阻止光标移至输入框最前面
                    event.preventDefault();
                    return;
                }

                //down arrow
                if (keyCode == 40) {
                    $(".as-selected").removeClass("as-selected");
                    selectIndex = (selectIndex + 1) % suggestionsNum;
                    $(that).next('.' + settings.menuClass).children().eq(selectIndex).addClass("as-selected");
                    upDownOperate = true;
                    return;
                }

                //enter
                if (keyCode == 13) {
                    //suggestion component is visible after the operation up and down arrows
                    if (upDownOperate) {
                        lock = true;
                        lastText = getRealText($(".as-selected").data('value'));
                        $(that).val(lastText);
                        lock = false;
                        closeComponent($(that).next('.' + settings.menuClass));

                        if (settings.immediate && settings.nextStep != null) {
                            settings.nextStep($(".as-selected"));
                        } else {
                            upDownOperate = false;
                        }
                        settings.onSelect && settings.onSelect($(".as-selected"));
                    } else {
                        if (settings.nextStep != null && $(that).val().length > 0) {
                            closeComponent($(that).next('.' + settings.menuClass));
                            settings.nextStep($(".as-selected"));
                            //防止多余请求
                            xhr.abort();
                        }
                    }
                }
            });

            //鼠标悬浮事件
            $(that).next('.' + settings.menuClass).children().each(function (index) {
                $(this).on("mouseenter", function () {
                    $(".as-selected").removeClass("as-selected");
                    $(this).addClass("as-selected");
                    selectIndex = index;
                });
            });
        }

        //建议框关闭
        function closeComponent(ele) {
            if (ele.is(':visible')) {
                ele.hide();
                if (settings.close != null) {
                    settings.close();
                }
            }
        }

        //建议框打开
        function openComponent(ele) {
            if (!ele.is(':visible')) {
                ele.show();
                if (settings.open != null) {
                    settings.open();
                }
            }
        }

        //do something after select menu
        function selectResult() {
            lock = true;
            lastText = getRealText($(this).data('value'));
            $(that).val(lastText);
            lock = false;

            closeComponent($(that).next('.' + settings.menuClass));
            $(that).focus();

            if (settings.immediate && settings.nextStep != null) {
                settings.nextStep($(".as-selected"));
            }
            settings.onSelect && settings.onSelect($(this));
            return false;
        }

        //返回组合后的文本
        function getRealText(selectedValue) {
            //没有分割府的话直接返回
            if (settings.split == null) {
                return selectedValue;
            }

            var query = $(that).val();
            var result = selectedValue;
            var index = query.lastIndexOf(settings.split);
            if (index != -1) {
                result = query.substring(0, index) + settings.split + selectedValue;
            }
            return result;
        }

        //获取真实查询内容
        function getRealQuery(query) {
            if (settings.split != null) {
                var index = query.lastIndexOf(settings.split);
                if (index != -1) {
                    query = query.substring(index + settings.split.length);
                }
            }
            return query;
        }

        //对文本加入高亮操作
        function getStrongText(text, matchText) {
            if (text == undefined) {
                return "";
            }
            if (matchText == undefined) {
                return text;
            }
            var searchStartPosition = 0;
            var textTmp = text;
            var result = "";
            var length = matchText.length;
            text = text.toLowerCase();
            matchText = matchText.toLowerCase();
            var index = text.indexOf(matchText, searchStartPosition);
            while (index != -1) {
                result = result + textTmp.substring(searchStartPosition, index) + "<strong>" + textTmp.substr(index, length) + "</strong>";
                searchStartPosition = index + length;
                index = textTmp.indexOf(matchText, searchStartPosition);
            }
            result = result + textTmp.substring(searchStartPosition);
            return result;
        }

        return this;
    };

}(jQuery));