var autosuggestClass = function(field, submitType, isMultiplySuggestionsOn, symbol, dirs) {

    field.attr('autocomplete', 'off');

    if(isMultiplySuggestionsOn && !symbol) {
        this.isMultiplySuggestionsOn = isMultiplySuggestionsOn;
        this.symbol = [','];
    }
    else if (!isMultiplySuggestionsOn) {
        this.isMultiplySuggestionsOn = false;
        this.symbol = '';
    }
    else if(isMultiplySuggestionsOn && symbol) {
        this.isMultiplySuggestionsOn = true;
        this.symbol = symbol;
    }
    if(!submitType) {
        var submitType = 'search';
    }

    var _this = this;
    this.position = 0;
    this.currValues = [];

    this.lastValue = '';
    this.newValue = '';

    this.params = {};

    this.ajaxUrl = dirs;
    
    // Используемые в форме classNames
    this.classNames = {
        holder : 'js-autosuggest-holder', 	//родитель поля ввода и поля вывода результатов поиска
        field : 'js-autosuggest-field', 	//поле ввода
        output : 'js-autosuggest-output'	//родитель полей вывода результатов
    };

    // Имена xml нодов и соотвествующие им имена функций-обработчиков
    this.xmlResponse = {
        nodata: {
            node: 'nodata',
            handler: null
        },

        error: {
            node: 'error',
            handler: 'xmlResponseHandler_error'
        },

        item: {
            node: 'item',
            handler: 'xmlResponseHandler_output'
        }
    };


    // Выводимый html
    this.htmlResponse = {
        item: 'div',
        value: 'em'
    };

    if (isOpera || window.webkit) {
        field.keypress(function(ev){
            if (_this.isActionKey(ev)) return;
            var targ = null;
            if (ev.target) targ = ev.target;
            else if (ev.srcElement) targ = ev.srcElement;
            if (targ.nodeType == 3) // defeat Safari bug
            targ = targ.parentNode;
            setTimeout(function(){ _this.onChange(targ, submitType); }, 30);
        });
    }
    
    field.keydown(function(ev){
        ev = ev || window.event;
        if (_this.isActionKey(ev)) {
            _this.onKeyUp(ev);
        }
    });

    field.keyup(function(ev){
        ev = ev || window.event;
        if (_this.isActionKey(ev)) return;
        if (!isOpera && !window.webkit) {
            var targ = null;
            if (ev.target) targ = ev.target;
            else if (ev.srcElement) targ = ev.srcElement;
            if (targ.nodeType == 3) // defeat Safari bug
            targ = targ.parentNode;
            setTimeout(function(){ _this.onChange(targ, submitType); }, 30);
        }
    });
};

// Переводим xml дерево в объект
autosuggestClass.prototype.parseXML = function(xmlObj){
    var xmlNodes = {};

    for (prop in this.xmlResponse){
        xmlNodes[prop] = xmlObj.getElementsByTagName(this.xmlResponse[prop].node);
    }
    return xmlNodes;
};

autosuggestClass.prototype.onKeyUp = function(ev) {
    ev = ev || window.event;
    return this.action(ev);
};

autosuggestClass.prototype.onChange = function(field, submitType) {
    this.processQuotes(field);
    this.requestSuggests(field, submitType);
};

autosuggestClass.prototype.isActionKey = function(ev) {
    switch (getCharCode(ev)) {
        case 13: // Enter
        case 27: // Escape
        case 40: // Down
        case 38: // Up
        return true;
        break;
    }
}

autosuggestClass.prototype.action = function(ev) {
    switch (getCharCode(ev)) {
        case 13:	//если нажата клавиша Enter
        if(!$(this.output).is('.hidden')) {
            if (this.setValue()) {
                if (!document.all)
                ev.preventDefault();
                else
                ev.returnValue = false;
            }
        }
        return true;
        break;
        case 27: // Escape
        if (!$(this.output).is('.hidden')) {
            $(this.output).addClass('hidden');
        }
        return true;
        break;
        case 40:	//если нажата клавиша "Вниз"
        this.makeSteps('down');
        return true;
        break;
        case 38:	//если нажата клавиша "Вверх"
        this.makeSteps('up');
        return true;
        break;
    }
    return false;
}

autosuggestClass.prototype.processQuotes = function(field) {
    this.isQuoteOpened = false;
    this.isQuoteClosedPreviously = false;
    this.noIndexedString ='';
    if(field.value.indexOf('"') != -1) {
        var quotesResults = field.value.match(/"/g);
	}
	if(quotesResults && quotesResults.length%2==0) {
		this.isQuoteOpened = false;
		if(field.value.match(/"$|"\n|"\r\n/)) {
        this.isQuoteClosedPreviously = true;
		}
		else {
		    this.isQuoteClosedPreviously = false;
		}
    }
    else if (quotesResults && quotesResults.length%2!=0) { this.isQuoteOpened = true; }

    if (this.isMultiplySuggestionsOn == true) { //если включена опция множественных подсказок
        if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) { //если открыта кавычка
            var words_quotes = field.value.split('"');
            this.isQuoteClosedPreviously == true? this.newValue = words_quotes[words_quotes.length-2] : this.newValue = words_quotes[words_quotes.length-1]
            this.newValue = this.newValue.replace(/(^\s+)|(\n)/g, '');
            var words = field.value.split(this.symbol);
            var words_length=words.length-1;
            for(var k=0; k<words_length; k++) {
                if(k==0) {
                    this.noIndexedString += words[k];
                }
                else {
                    this.noIndexedString += this.symbol + words[k];
                }
            }
        } else {
            var words = field.value.split(this.symbol);
            this.newValue = words[words.length-1].replace(/(^\s+)|(\n)/g, '');
            var words_length=words.length-1;
            for(var k=0; k<words_length; k++) {
                if(k==0) {
                    this.noIndexedString += words[k];
                }
                else {
                    this.noIndexedString += this.symbol + words[k];
                }
            }
        }
    }
    else {
        if(this.isQuoteOpened == true) {
            var words_quotes = field.value.split('"');
            this.newValue = words_quotes[words_quotes.length-1].replace(/(^\s+)|(\n)/g, '');
        }
        else {
            this.newValue = field.value;
        }
    }
}

autosuggestClass.prototype.requestSuggests = function(field, submitType) {
    this.holder = this.holder || getParentByClassName(field, this.classNames.holder);
    this.output = this.output || getElementsByClassName(this.holder, '*', this.classNames.output)[0];
    if (this.newValue == '') {
        $(this.output).addClass('hidden');
        this.output.innerHTML ='';
        this.lastValue = this.newValue;
        return false;
    }
    else {
        $(this.output).removeClass('hidden');
    }
    if ($(this.holder).is("."+this.classNames.isLoading) || this.lastValue == this.newValue) {
        return false;
    }
    var data = 'letters=' + this.newValue + '&type=' + submitType;
    this.params = {
        holder : this.holder,
        field : field,
        string : this.newValue,
        output : this.output,
        noIndexedString : this.noIndexedString
    };
    ajaxLoadPost(this.ajaxUrl, data, this.sendDataOnload, this, this.params);
    //$(this.holder).addClass(this.classNames.isLoading);
    this.lastValue = this.newValue;
}

// Чтение ответа сервера на пересылку  всех данных формы и обработка выданных ошибок
autosuggestClass.prototype.sendDataOnload = function(ajaxObj, params) {
    //$(params.holder).removeClass(this.classNames.isLoading);
    if(ajaxObj && ajaxObj.responseXML){
        var xmlObj = ajaxObj.responseXML;
        var xmlNodes = this.parseXML(xmlObj);

        for (prop in xmlNodes){
            if(this[this.xmlResponse[prop].handler]) {
                this[this.xmlResponse[prop].handler](xmlNodes, params);
            }
        }
    }
};

// Вывод данных
autosuggestClass.prototype.xmlResponseHandler_output = function(xmlNodes, params) {
    var _this = this;
    //$(params.output).removeClass('hidden');
    this.position = 0;
    this.params.output.innerHTML = '';
    if(xmlNodes.item && xmlNodes.item.length) {
        for(var i=0; i<xmlNodes.item.length; i++) {
            var item = document.createElement(this.htmlResponse.item);
            var html = xmlNodes.item[i].firstChild.data;
            this.currValues[i] = xmlNodes.item[i].firstChild.data;
            var searchString = new RegExp('(' + params.string + ')', 'gi');
            var replaceString = '<' +this.htmlResponse.value + '>' + '$1' + '</' + this.htmlResponse.value + '>';
            var html = html.replace(searchString, replaceString);
            params.output.appendChild(item);
            item.innerHTML = html;
        }

        params.field.onfocus = function() {
            //$(params.output).removeClass('hidden');
        }

        params.field.onblur = function(ev) {

            if(!ev) { ev = window.event; }

            var targ;
            if (!ev) var ev = window.event;
            if (ev.target) targ = ev.target;
            else if (ev.srcElement) targ = ev.srcElement;
            if (targ.nodeType == 3) // defeat Safari bug
            targ = targ.parentNode;

            if(targ!=params.field && targ.parentNode!=params.output) {
                $(params.output).addClass('hidden');
            }
        }

        document.onclick = function(ev) {

            var targ = (typeof event!=='undefined')? event.srcElement : ev.target;

            if(targ!=params.field && targ.parentNode!=params.output) {
                $(params.output).addClass('hidden');
            }
        }
        this.mouseHandler();
    }
};

// устанавливаем значение
autosuggestClass.prototype.setValue = function() {
    var result = false;
    if(this.params.output && this.params.output.getElementsByTagName(this.htmlResponse.item)[0]) {
        var result_items = this.params.output.getElementsByTagName(this.htmlResponse.item);
        var result_items_length = result_items.length;
        for (var i=0; i<result_items.length; i++) {
            if(result_items[i].className == 'active') {
                if(this.isMultiplySuggestionsOn == true) {
                    if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) {
                        var replacedValue = this.params.string.replace(this.params.string, this.currValues[this.position-1]);
                        if(this.params.noIndexedString!='') {
                            this.params.field.value = this.params.noIndexedString + this.symbol + this.spacer + '"' + replacedValue;
                            if(this.isQuoteClosedPreviously == true) {
                                this.params.field.value += '"';
                                result = true;
                            }
                        }
                        else {
                            this.params.field.value = '"' + replacedValue;
                            result = true;
                            if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                        }
                    }
                    else {
                        var replacedValue = this.params.string.replace(this.params.string, this.currValues[this.position-1]);
                        if(this.params.noIndexedString!='') {
                            this.params.field.value = this.params.noIndexedString + this.symbol + this.spacer + replacedValue + ", ";
                            result = true;
                        }
                        else {
                            this.params.field.value = replacedValue + ", ";
                            result = true;
                        }
                    }
                }
                else {
                    if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) {
                        this.params.field.value = '"' + this.currValues[this.position-1];
                        result = true;
                    }
                    else {
                        this.params.field.value = this.currValues[this.position-1];
                        result = true;
                    }
                }

                $(this.params.output).addClass('hidden');

                this.params.output.innerHTML = '';

                if(this.params.field.value && this.params.field.value.match(/\r\n$/)) {
                    this.params.field.value = this.params.field.value.replace(/\r\n$/, '');
                }

                else {
                    this.params.field = this.currValues[i];
                    $(this.params.output).addClass('hidden');
                    this.params.output.innerHTML = '';
                }
            }
        }
    }
    return result;
};

// навигация по результатам запроса с помощью клавиатуры
autosuggestClass.prototype.makeSteps = function(direction) {
    if(this.params.output.getElementsByTagName(this.htmlResponse.item)[0]) {
        var result_items = this.params.output.getElementsByTagName(this.htmlResponse.item);
        var result_items_length = result_items.length;
        for (var i=0; i<result_items.length; i++) {
            result_items[i].className = '';
        }
        this.spacer = '';
        this.symbol == ',' ? this.spacer = ' ' : this.spacer = '';
        if(direction == 'down' && this.position<=result_items_length-1) {
            result_items[this.position].className = 'active';
            if(this.isMultiplySuggestionsOn == true) {
                if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) {
                    var replacedValue = this.params.string.replace(this.params.string, this.currValues[this.position]);
                    if(this.params.noIndexedString!='') {
                        this.params.field.value = this.params.noIndexedString + this.symbol + this.spacer + '"' + replacedValue;
                        if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                    }
                    else {
                        this.params.field.value = '"' + replacedValue;
                        if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                    }
                }
                else {
                    var replacedValue = this.params.string.replace(this.params.string, this.currValues[this.position]);
                    if(this.params.noIndexedString!='') {
                        this.params.field.value = this.params.noIndexedString + this.symbol + this.spacer + replacedValue;
                    }
                    else {
                        this.params.field.value = replacedValue;
                    }
                }
            }
            else {
                if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) {
                    this.params.field.value = '"' + this.currValues[this.position];
                    if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                }
                else {
                    this.params.field.value = this.currValues[this.position];
                }
            }
            this.position++;
        }
        else if(direction == 'up' && this.position>1) {
            result_items[this.position-2].className = 'active';
            if(this.isMultiplySuggestionsOn == true) {
                if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) {
                    var replacedValue = this.params.string.replace(this.params.string, this.currValues[this.position-2]);
                    if(this.params.noIndexedString!='') {
                        this.params.field.value = this.params.noIndexedString + this.symbol + this.spacer + '"' + replacedValue;
                        if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                    }
                    else {
                        this.params.field.value = '"' + replacedValue;
                        if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                    }
                }
                else {
                    var replacedValue = this.params.string.replace(this.params.string, this.currValues[this.position-2]);
                    if(this.params.noIndexedString!='') {
                        this.params.field.value = this.params.noIndexedString + this.symbol + this.spacer + replacedValue;
                    }
                    else {
                        this.params.field.value = replacedValue;
                    }
                }
            }
            else {
                if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) {
                    this.params.field.value = '"' + this.currValues[this.position-2];
                    if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                }
                else {
                    this.params.field.value = this.currValues[this.position-2];
                }
            }
            this.position--;
        }
        else if (this.position>result_items_length-1) {
            this.position=0;
            result_items[this.position].className = 'active';
            if(this.isMultiplySuggestionsOn == true) {
                if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) {
                    var replacedValue = this.params.string.replace(this.params.string, this.currValues[this.position]);
                    if(this.params.noIndexedString!='') {
                        this.params.field.value = this.params.noIndexedString + this.symbol + this.spacer + '"' + replacedValue;
                        if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                    }
                    else {
                        this.params.field.value = '"' + replacedValue;
                        if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                    }
                }
                else {
                    var replacedValue = this.params.string.replace(this.params.string, this.currValues[this.position]);
                    if(this.params.noIndexedString!='') {
                        this.params.field.value = this.params.noIndexedString + this.symbol + this.spacer + replacedValue;
                    }
                    else {
                        this.params.field.value = replacedValue;
                    }
                }
            }
            else {
                if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) {
                    this.params.field.value = '"' + this.currValues[this.position];
                    if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                }
                else {
                    this.params.field.value = this.currValues[this.position];
                }
            }
            this.position++;
        }
        else if(direction == 'up' && this.position<=1) {
            this.position=result_items_length-1;
            result_items[this.position].className = 'active';
            if(this.isMultiplySuggestionsOn == true) {
                if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) {
                    var replacedValue = this.params.string.replace(this.params.string, this.currValues[this.position]);
                    if(this.params.noIndexedString!='') {
                        this.params.field.value = this.params.noIndexedString + this.symbol + this.spacer + '"' + replacedValue;
                        if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                    }
                    else {
                        this.params.field.value = '"' + replacedValue;
                        if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                    }
                }
                else {
                    var replacedValue = this.params.string.replace(this.params.string, this.currValues[this.position]);
                    if(this.params.noIndexedString!='') {
                        this.params.field.value = this.params.noIndexedString + this.symbol + this.spacer + replacedValue;
                    }
                    else {
                        this.params.field.value = replacedValue;
                    }
                }
            }
            else {
                if(this.isQuoteOpened == true || this.isQuoteClosedPreviously == true) {
                    this.params.field.value = '"' + this.currValues[this.position];
                    if(this.isQuoteClosedPreviously == true) { this.params.field.value += '"'; }
                }
                else {
                    this.params.field.value = this.currValues[this.position];
                }
            }
            this.position++;
        }
    }
};

// навигация по результатам запроса с помощью мышки
autosuggestClass.prototype.mouseHandler = function() {
    var _this = this;
    var items = this.params.output.getElementsByTagName(this.htmlResponse.item);
    var items_length = items.length;
    for (var i=0; i<items_length; i++) {
        items[i].onmouseover = function(i_) {
            return function () {
                for (var k=0; k<items_length; k++) {
                    items[k].className = '';
                }
                this.className = 'active';
                _this.position = i_+1;
            }
        }(i);
        items[i].onmouseout = function() {
            this.className = '';
            /* _this.position = 0; */
        }
        items[i].onclick = function(i_) {
            return function() {
                var holder = getParentByClassName(this, _this.classNames.holder);
                var field = getElementsByClassName(holder, '*',  _this.classNames.field)[0];
                if(_this.isMultiplySuggestionsOn == true) {
                    if(_this.isQuoteOpened == true) {
                        var replacedValue = _this.params.string.replace(_this.params.string, _this.currValues[i_]);
                        _this.spacer ='';
                        _this.symbol == ',' ? _this.spacer = ' ' : _this.spacer = '';
                        if(_this.params.noIndexedString!='') {
                            _this.params.field.value = _this.params.noIndexedString + _this.symbol + _this.spacer + '"' + replacedValue;
                        }
                        else {
                            _this.params.field.value = '"' + replacedValue;
                        }
                    }
                    else {
                        var replacedValue = _this.params.string.replace(_this.params.string, _this.currValues[i_]);
                        _this.spacer ='';
                        _this.symbol == ',' ? _this.spacer = ' ' : _this.spacer = '';
                        if(_this.params.noIndexedString!='') {
                            _this.params.field.value = _this.params.noIndexedString + _this.symbol + _this.spacer + replacedValue + ", ";
                        }
                        else {
                            _this.params.field.value = replacedValue + ", ";
                        }
                    }
                    $(_this.params.output).addClass('hidden');
                }
                else {
                    if(_this.isQuoteOpened == true) {
                        field.value = '"' + _this.currValues[i_];
                    }
                    else {
                        field.value = _this.currValues[i_];
                    }
                }

                $(_this.params.output).addClass('hidden');

                _this.params.output.innerHTML = '';

                field.focus();
                moveCaretToEnd(field);
            }
        }(i);
    }
};