// ----------------------------------------------------------------
// EwCore
// ----------------------------------------------------------------
var EwCore = new function () {

    var self = this;

    this.lang = "";
    this.applicationPath = "/";

    this.getEwUrl = function (ewAppUrl) {
        return this.applicationPath + ewAppUrl;
    };

    this.ajaxContentAdded = function (element) {
        $(element).ajaxFormParse();
    };

    var ajaxUrlInternal = function (ajaxItemPath, command, addUniqueId) {
        var url = self.getEwUrl("ew/ajax/" + command + "?path=" + EwUtils.urlEncode(ajaxItemPath.replace("\\", "/")));
        if (addUniqueId) {
            var uniqueId = EwCore.newUniqueId("ajax");
            url += "&uniqueId=" + EwUtils.urlEncode(uniqueId);
        }
        return url;
    };

    this.ajaxUrlGet = function (ajaxItemPath, model) {
        var requestData = this.createDataRequestBasic();
        if (model != undefined) {
            $.extend(requestData, { model: model });
        }
        var requestDataParam = JSON.stringify(requestData);
        return ajaxUrlInternal(ajaxItemPath, "get", true) + "&data=" + EwUtils.urlEncode(requestDataParam);
    };

    this.createDataRequestBasic = function () {
        var ret = {
            lang: self.lang,
            masterTemplateName: self.masterTemplateName
        };
        if (self.templateContextGuid != undefined) {
            ret.templateContextGuid = self.templateContextGuid;
        }
        return ret;
    };

    var ajaxBaseCall = function (url, optsInternal, opts) {
        var requestData = self.createDataRequestBasic();
        if (opts != undefined && opts.model != undefined) {
            $.extend(requestData, { model: opts.model });
        }
        if (optsInternal.requestExt != undefined) {
            $.extend(requestData, optsInternal.requestExt);
        }
        var ajaxParams = {
            type: 'POST',
            cache: false,
            url: url,
            dataType: optsInternal.dataType,
            contentType: 'application/json',
            data: JSON.stringify(requestData),
            success: optsInternal.success,
            complete: function (xhr) {
                var location = xhr.getResponseHeader("Location");
                if (location) {
                    window.location = location;
                }
            }
        };
        if (opts != undefined) {
            $.extend(ajaxParams, {
                error: opts.error,
                async: opts.async
            });            
        }
        $.ajax(ajaxParams);
    };

    this.ajaxLoad = function (ajaxItemPath, opts) {
        var ajaxCallSuccess = function (htmlContent) {
            if (opts != undefined && opts.success != undefined) {
                opts.success(htmlContent);
            }
            if (opts != undefined && opts.targetId != undefined) {
                var $target = $("#" + opts.targetId);
                $target.html(htmlContent);
                self.ajaxContentAdded($target[0]);
            }
        };
        var url = ajaxUrlInternal(ajaxItemPath, "post", true);
        ajaxBaseCall(url, { success: ajaxCallSuccess, dataType: "html" }, opts);
    };

    this.ajaxAction = function (ajaxItemPath, actionName, actionData, opts) {
        var ajaxCallSuccess = function (responseData) {
            var htmlContent = responseData.htmlContent;
            if (opts != undefined && opts.success != undefined) {
                opts.success(htmlContent, responseData);
            }
            if (opts != undefined && opts.targetId != undefined) {
                var $target = $("#" + opts.targetId);
                $target.html(htmlContent);
                self.ajaxContentAdded($target[0]);
            }
            self.processAjaxControlActionResponse(responseData);
        };
        var url = ajaxUrlInternal(ajaxItemPath, "action", false);
        ajaxBaseCall(url, { requestExt: { actionName: actionName, actionData: actionData }, success: ajaxCallSuccess, dataType: "json" }, opts);
    };

    this.ajaxData = function (ajaxItemPath, methodName, methodData, opts) {
        var ajaxCallSuccess = function (data) {
            if (opts != undefined && opts.success != undefined) {
                opts.success(data);
            }
        };
        var url = ajaxUrlInternal(ajaxItemPath, "data");
        ajaxBaseCall(url, { requestExt: { methodName: methodName, methodData: methodData }, success: ajaxCallSuccess, dataType: "json" }, opts);
    };

    this.ajaxLoadError = undefined;

    this.processAjaxControlActionResponse = function (responseData) {
        if (responseData.resultErrorMessages != undefined) {
            var message = "";
            for (var i = 0; i < responseData.resultErrorMessages.length; i++) {
                var mes = responseData.resultErrorMessages[i];
                if (mes != "") {
                    if (message != "") {
                        message += "<br />";
                    }
                    message += "<span>" + mes + "</span>";
                }
            }
            EwDialogs.userMessage(message);
        }
        if (responseData.resultJavaScriptCode != undefined) {
            var caller = function () { eval(responseData.resultJavaScriptCode); };
            caller.call(responseData);
        }
        if (responseData.actionResultRedirectToUrl != undefined) {
            window.location = responseData.actionResultRedirectToUrl;
        } else if (responseData.actionResultReload) {
            window.location.reload(true);
        }
    };

    this.isAjaxUserAborted = function(xhr) {
        return !xhr.getAllResponseHeaders();
    }

    var uniqueIdIndex = 0;

    this.newUniqueId = function (prefix) {
        if (prefix == null) { prefix = "default"; };
        return prefix + "-ewUniqueId-" + (++uniqueIdIndex);
    };
};

$(function () {
    $(document).ajaxError(function (event, jqxhr, settings, thrownError) {
        if (settings.error == undefined) {
            if (!EwCore.isAjaxUserAborted(jqxhr)) {
                if (EwCore.ajaxLoadError == undefined) {
                    EwDialogs.errorMessage("Ajax request error '" + thrownError + "' on url '" + settings.url + "'!");
                } else {
                    if (EwCore.ajaxLoadError != null) {
                        EwCore.ajaxLoadError(event, jqxhr, settings, thrownError);
                    }
                }
            }
        }
    });
});

// ----------------------------------------------------------------
// EwUtils
// ----------------------------------------------------------------
var EwUtils = new function () {

    this.updateQueryStringParameter = function (url, key, value, setItEmpty) {
        var re = new RegExp("([?|&])" + key + "=.*?(&|$)", "i");
        var clearEmpty = (setItEmpty != true && (value == undefined || value == ''));
        if (url.match(re)) {
            if (clearEmpty) {
                return url.replace(re, '$1').replace(/[&|?]+$/, "");
            }
            return url.replace(re, '$1' + key + "=" + value + '$2');
        } else {
            if (clearEmpty) {
                return url;
            } else {
                var separator = url.indexOf('?') !== -1 ? "&" : "?";
                return url + separator + key + "=" + value;
            }
        }
    };

    this.notUndefined = function (value) {
        if (value != undefined) {
            return value;
        }
        return "";
    };

    this.utf8Encode = function (string) {
        string = string.replace(/\r\n/g, "\n");
        var utftext = "";
        for (var n = 0; n < string.length; n++) {
            var c = string.charCodeAt(n);
            if (c < 128) {
                utftext += String.fromCharCode(c);
            } else if ((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            } else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }
        }
        return utftext;
    };

    this.utf8Decode = function (utftext) {
        var string = "";
        var i = 0;
        var c, c2, c3;
        while (i < utftext.length) {
            c = utftext.charCodeAt(i);
            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            } else if ((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i + 1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            } else {
                c2 = utftext.charCodeAt(i + 1);
                c3 = utftext.charCodeAt(i + 2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }
        }
        return string;
    };

    this.urlEncode = function (string) {
        return escape(this.utf8Encode(string));
    };

    this.urlDecode = function (urlParam) {
        return this.utf8Decode(unescape(urlParam));
    };

    this.htmlEncode = function (value) {
        return $('<div/>').text(value).html();
    };

    this.htmlDecode = function (value) {
        return $('<div/>').html(value).text();
    };

    var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

    this.base64Encode = function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;

        input = this.utf8Encode(input);
        while (i < input.length) {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);
            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;
            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }
            output = output +
			keyStr.charAt(enc1) + keyStr.charAt(enc2) +
			keyStr.charAt(enc3) + keyStr.charAt(enc4);
        }
        return output;
    };

    this.base64Decode = function (input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;
        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
        while (i < input.length) {
            enc1 = keyStr.indexOf(input.charAt(i++));
            enc2 = keyStr.indexOf(input.charAt(i++));
            enc3 = keyStr.indexOf(input.charAt(i++));
            enc4 = keyStr.indexOf(input.charAt(i++));
            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;
            output = output + String.fromCharCode(chr1);
            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }
        }
        output = this.utf8Decode(output);
        return output;
    };

    this.setCookie = function (name, value, opts) {
        var expires = "";
        var seconds = undefined;
        if (opts != undefined) {
            if (opts.seconds != undefined) {
                seconds = opts.seconds;
            }
            if (opts.minutes != undefined) {
                if (!seconds) seconds = 0;
                seconds += opts.minutes * 60;
            }
            if (opts.hours != undefined) {
                if (!seconds) seconds = 0;
                seconds += opts.hours * 60 * 60;
            }
            if (opts.days != undefined) {
                if (!seconds) seconds = 0;
                seconds += opts.days * 24 * 60 * 60;
            }
        }
        if (typeof (seconds) != 'undefined') {
            var date = new Date();
            date.setTime(date.getTime() + (seconds * 1000));
            expires = "; expires=" + date.toGMTString();
        }
        document.cookie = name + "=" + value + expires + "; path=/";
    };

    this.getCookie = function (name) {
        name = name + "=";
        var carray = document.cookie.split(';');
        for (var i = 0; i < carray.length; i++) {
            var c = carray[i];
            while (c.charAt(0) == ' ') c = c.substring(1, c.length);
            if (c.indexOf(name) == 0) return c.substring(name.length, c.length);
        }
        return null;
    };

    this.deleteCookie = function (name) {
        this.setCookie(name, "", -1);
    };

    this.getUrlParamsAsJson = function () {
        var urlParams = {};
        var d = function (s) { return decodeURIComponent(s.replace(/\+/g, " ")); };
        var q = window.location.search.substring(1);
        var r = /([^&=]+)=?([^&]*)/g;
        var e;
        while (e = r.exec(q)) {
            urlParams[d(e[1])] = d(e[2]);
        }
        return urlParams;
        //var search = location.search.substring(1);
        //return JSON.parse('{"' + decodeURI(search).replace(/"/g, '\\"').replace(/&/g, '","').replace(/=/g, '":"') + '"}');
    };

    this.getUrlParameter = function (name) {
        return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search) || [, ""])[1].replace(/\+/g, '%20')) || null;
    };

    this.parseNumber = function (originalValue, defaultValue) {
        return this.parseValue(originalValue, "number", defaultValue);
    };

    this.parseBoolean = function (originalValue, defaultValue) {
        return this.parseValue(originalValue, "boolean", defaultValue);
    };

    this.parseValue = function (originalValue, type, defaultValue) {
        var val = originalValue;
        switch (typeof val) {
            case "function": val = val(); break;
            case "object": if (val instanceof HTMLElement) { val = $(val).val(); } break;
        }
        if (val == undefined) {
            return defaultValue;
        }

        switch (type) {
            case "string": {
                return originalValue + "";
            }
            case "number": {
                if (typeof val === "boolean") {
                    return val ? 1 : 0;
                }
                if (typeof val === "number") {
                    return val;
                }
                val = parseFloat((val + "").replace(',', '.').replace(/\s/g, ''));
                return isNaN(val) ? defaultValue : val;
            }
            case "boolean": {
                if (typeof val === "number") {
                    return val != 0;
                }
                if (typeof val === "boolean") {
                    return val;
                }

                val += "";
                if (val.match(/\.(true|yes|1|t|y)$/i)) {
                    return true;
                }
                if (val.match(/\.(false|no|0|f|n)$/i)) {
                    return true;
                }
                return defaultValue;
            }
            default: {
                throw "EwUtils.parseValue(): unsupported type '" + type + "'!";
            }
        }
    };
};

// ----------------------------------------------------------------
// DataViewManager
// ----------------------------------------------------------------
var DataViewManager = new function () {

    this.firstPageUrl = [];

    this.isAjaxView = [];

    this.setFirstPageUrl = function (dataViewManagerInstance, url) {
        this.isAjaxView[dataViewManagerInstance] = false;
        this.firstPageUrl[dataViewManagerInstance] = url;
    };

    this.setAjaxView = function (dataViewManagerInstance) {
        this.isAjaxView[dataViewManagerInstance] = true;
    };

    this.navigateViewWithParameterUpdate = function (dataViewManagerInstance, key, value, setIfEmpty, firstPath) {
        var isAjaxView = this.isAjaxView[dataViewManagerInstance];
        if (!isAjaxView) {
            if (firstPath == undefined || firstPath) {
                var url = "http://humlickovi-com.cs4.cstech.cz/this.firstPageUrl[dataViewManagerInstance];" window.location.href = EwUtils.updateQueryStringParameter(url, key, value, setIfEmpty);
            } else {
                window.location.href = EwUtils.updateQueryStringParameter(window.location.href, key, value, setIfEmpty);
            }
        }
    };

    this.navigateViewWithParameterUpdateFromCombo = function (dataViewManagerInstance, key, obj, setIfEmpty, firstPath) {
        this.navigateViewWithParameterUpdate(dataViewManagerInstance, key, obj.options[obj.selectedIndex].value, setIfEmpty, firstPath);
    };
};

// ----------------------------------------------------------------
// Partial render controls support
// ----------------------------------------------------------------
var PartialRenderControls = new function () {

    var self = this;
    var partialControls = [];

    var actionCallInternal = function (controlDivId, controls, actionName, actionData, actionInitiator) {
        var dataBasic = EwCore.createDataRequestBasic();
        var actionControl = self.getInstanceByControlDivId(controlDivId);
        if (actionControl == undefined) {
            throw { toString: function () { return "Partial render control #" + controlDivId + " is not registered!"; } };
        }
        var controlsArray = [];
        controlsArray.push(actionControl);
        if (controls != undefined) {
            for (var i = 0; i < controls.length; i++) {
                var partialRenderInfo = controls[i];
                if (partialRenderInfo.controlDivId != controlDivId) {
                    controlsArray.push(partialRenderInfo);
                }
            }
        }
        var requestData = $.extend({ controls: controlsArray, actionName: actionName, actionData: actionData }, dataBasic);
        if (actionInitiator != undefined) {
            requestData.actionInitiator = actionInitiator;
        }
        var reloadUrl = self.getPartialRenderHandlerUrl("action");
        self.jsonRequest(reloadUrl, requestData);
    };

    var reloadInternal = function (requestData) {
        var reloadUrl = self.getPartialRenderHandlerUrl("reload");
        self.jsonRequest(reloadUrl, requestData);
    };

    var removeByControlDivId = function (controlDivId) {
        for (var i = partialControls.length - 1; i >= 0; i--) {
            if (partialControls[i].controlDivId == controlDivId) {
                partialControls.splice(i, 1);
            }
        }
    };

    var checkControlDivIdIsValid = function (controlDivId) {
        return $('#' + controlDivId).length > 0;
    };

    this.reloadByTags = function (tags) {
        reloadInternal(this.createDataRequestReloadByTags(tags));
    };

    this.reloadByControlDivIds = function (controlDivIds) {
        reloadInternal(this.createDataRequestReloadByControlDivIds(controlDivIds));
    };

    this.reloadAll = function () {
        this.reloadByTags();
    };

    this.actionCallSimple = function (controlDivId, actionName, actionData, actionInitiator) {
        actionCallInternal(controlDivId, undefined, actionName, actionData, actionInitiator);
    };

    this.actionCallAndRefreshByTags = function (controlDivId, refreshTags, actionName, actionData, actionInitiator) {
        var controls = this.getInstancesByTags(refreshTags);
        actionCallInternal(controlDivId, controls, actionName, actionData, actionInitiator);
    };

    this.actionCallAndRefreshByIds = function (controlDivId, refreshControlDivIds, actionName, actionData, actionInitiator) {
        var controls = this.getInstancesByControlDivIds(refreshControlDivIds);
        actionCallInternal(controlDivId, controls, actionName, actionData, actionInitiator);
    };

    this.requestCallAndRefreshByTags = function (url, refreshTags, data) {
        var dataRequest = PartialRenderControls.createDataRequestReloadByTags(refreshTags);
        this.jsonRequest(url, $.extend(dataRequest, data));
    };

    this.requestCallAndRefreshByIds = function (url, refreshControlDivIds, data) {
        var dataRequest = PartialRenderControls.createDataRequestReloadByIds(refreshControlDivIds);
        this.jsonRequest(url, $.extend(dataRequest, data));
    };

    this.getPartialRenderHandlerUrl = function (command) {
        return EwCore.getEwUrl("ew/partial_render/" + command);
    };

    this.registerPartialRenderControlInstance = function (controlDivId, controlType, renderParams, tags) {
        removeByControlDivId(controlDivId);
        partialControls.push({ controlDivId: controlDivId, controlType: controlType, renderParams: renderParams, tags: tags });
    };

    this.getInstancesByTags = function (tags, checkValitity) {
        var ret = [];
        var tagsArray;
        if (tags != undefined && tags.length > 0) {
            tagsArray = tags.split(",");
        }
        for (var i = 0; i < partialControls.length; i++) {
            var partialRenderInfo = partialControls[i];
            var tagsMatch = false;
            if (tagsArray == undefined) {
                tagsMatch = true;
            } else {
                if (partialRenderInfo.tags != undefined) {
                    var n = partialRenderInfo.tags.split(",");
                    for (var j = 0; j < tagsArray.length; j++) {
                        var tagCheck = tagsArray[j];
                        if ($.inArray(tagCheck, n) != -1) {
                            tagsMatch = true;
                            break;
                        }
                    }
                }
            }
            if (tagsMatch) {
                if (!checkValitity || checkControlDivIdIsValid(partialRenderInfo.controlDivId)) {
                    ret.push(partialRenderInfo);
                }
            }
        }
        return ret;
    };

    this.getInstancesByControlDivIds = function (controlDivIds, checkValitity) {
        var ret = [];
        var controlDivIdArray;
        if (controlDivIds != undefined && controlDivIds.length > 0) {
            controlDivIdArray = controlDivIds.split(",");
            for (var i = 0; i < partialControls.length; i++) {
                var partialRenderInfo = partialControls[i];
                if ($.inArray(partialRenderInfo.controlDivId, controlDivIdArray) != -1) {
                    if (!checkValitity || checkControlDivIdIsValid(partialRenderInfo.controlDivId)) {
                        ret.push(partialRenderInfo);
                    }
                }
            }
        }
        return ret;
    };

    this.getInstanceByControlDivId = function (controlDivId) {
        for (var i = 0; i < partialControls.length; i++) {
            var partialRenderInfo = partialControls[i];
            if (partialRenderInfo.controlDivId == controlDivId) {
                return partialRenderInfo;
            }
        }
        return undefined;
    };

    this.createDataRequestReloadByTags = function (tags) {
        var dataBasic = EwCore.createDataRequestBasic();
        var controls = this.getInstancesByTags(tags, true);
        return $.extend({ controls: controls }, dataBasic);
    };

    this.createDataRequestReloadByControlDivIds = function (controlDivIds) {
        var dataBasic = EwCore.createDataRequestBasic();
        var controls = this.getInstancesByControlDivIds(controlDivIds, true);
        return $.extend({ controls: controls }, dataBasic);
    };

    this.jsonRequest = function (url, requestData, opts) {
        var error = (opts != undefined) ? opts.error : undefined;
        var success = (opts != undefined) ? opts.success : undefined;
        var complete = (opts != undefined) ? opts.complete : undefined;
        var postBackWriteContent = function (dataResponse) {
            if (dataResponse != undefined && dataResponse.controls != undefined) {
                for (var i = 0; i < dataResponse.controls.length; i++) {
                    var partialRenderData = dataResponse.controls[i];
                    var $target = $("#" + partialRenderData.controlDivId);
                    $target.html(partialRenderData.htmlContent);
                    EwCore.ajaxContentAdded($target[0]);
                }
            }
            EwCore.processAjaxControlActionResponse(dataResponse);
            if (typeof success == 'function') {
                success();
            }
        };
        var ajaxParams = {
            type: 'POST',
            url: url,
            dataType: "json",
            contentType: 'application/json',
            data: JSON.stringify(requestData),
            success: postBackWriteContent,
            complete: function (xhr) {
                var location = xhr.getResponseHeader("Location");
                if (location) {
                    window.location = location;
                } else {
                    if (typeof complete == 'function') {
                        complete();
                    }
                }
            }
        };
        if (error != undefined) {
            $.extend(ajaxParams, { error: error });
        }
        $.ajax(ajaxParams);
    };
};

// ----------------------------------------------------------------
// EwDialog
// ----------------------------------------------------------------
var EwDialogs = new function () {
    // to override by a plugin (custom dialogs design)
    this.customUserMessage = undefined;
    this.customErrorMessage = undefined;
    this.customConfirm = undefined;

    var checkOverrideFunctionExists = function (funcName) {
        // ReSharper disable UseOfImplicitGlobalInFunctionScope
        return (typeof EwDialogsOverride !== 'undefined' && EwDialogsOverride[funcName] != undefined);
        // ReSharper restore UseOfImplicitGlobalInFunctionScope
    };

    var stripHtml = function (html) {
        return $("<div>" + EwUtils.htmlEncode(html) + "</div>").text();
    };

    this.errorMessage = function (msg) {
        if (this.customErrorMessage != undefined) {
            this.customErrorMessage(msg);
        } else {
            if (checkOverrideFunctionExists("errorMessage")) {
                // ReSharper disable UseOfImplicitGlobalInFunctionScope
                EwDialogsOverride.errorMessage(msg);
                // ReSharper restore UseOfImplicitGlobalInFunctionScope
            } else {
                alert(stripHtml(msg));
            }
        }
    };

    this.userMessage = function (msg) {
        if (this.customUserMessage != undefined) {
            this.customUserMessage(msg);
        } else {
            if (checkOverrideFunctionExists("userMessage")) {
                // ReSharper disable UseOfImplicitGlobalInFunctionScope
                EwDialogsOverride.userMessage(msg);
                // ReSharper restore UseOfImplicitGlobalInFunctionScope
            } else {
                alert(stripHtml(msg));
            }
        }
    };

    this.confirm = function (msg, opts) {
        if (this.customConfirm != undefined) {
            this.customConfirm(msg, opts);
        } else {
            if (checkOverrideFunctionExists("confirm")) {
                // ReSharper disable UseOfImplicitGlobalInFunctionScope
                EwDialogsOverride.confirm(msg, opts);
                // ReSharper restore UseOfImplicitGlobalInFunctionScope
            } else {
                if (confirm(stripHtml(msg))) {
                     opts.submit();
                }
            }
        }
    };
};

// ----------------------------------------------------------------
// AjaxForms
// ----------------------------------------------------------------
var AjaxForms = (function ($, window) {
    'use strict';
    var fieldModelSelector = 'ajaxFormFieldModel',
		forms = [],
        formSelector = '*[data-ajax-form=true], form:not(#aspnetForm)',
        keys = { tab: 9, enter: 13, shift: 16, ctrl: 17, alt: 18 },
        validators = {},
        viewModelSelector = 'ajaxFormViewModel',
        getField = function (formModel, fieldName) {
            var field = formModel.fields[fieldName];

            if (field === undefined) {
                throw 'Error: Unable to find field with name ' + fieldName + ' in current form (' + formModel.name + ')!';
            }
            return field;
        },
		getForm = function (element) {
		    var $element = $(element);

		    if (!$element.is(formSelector)) {
		        $element = $element.closest(formSelector);
		    }
		    return $element;
		},
        gotFocus = function (formModel) {
            var dateBlur = formModel.prevFieldBlur;
            if (dateBlur != null && new Date().getTime() - dateBlur < 20) {
                formModel.prevFieldBlur = null;
                var $prev = formModel.$prevField;
                var prevModel = $prev.data(fieldModelSelector);
                if (formModel.options.validationMode === 'focusOut' || (formModel.options.validationMode === 'focusOutWhenChanged' && prevModel.getValue() !== $prev.data("valueOnFocus"))) {
                    prevModel.validate();
                }
            }
        },
		defaults = {
		    autoErrorClass: true,
		    autoValidatorClass: true,
		    autoValidatorClassPrefix: 'val_',
		    errorClass: 'error',
		    onChangeVisibility: function (targetElement, visible) {
		        if (visible) {
		            $(targetElement).show();
		        } else {
		            $(targetElement).hide();
		        }
		    },
		    onRefreshLayout: function (formModel, initPhase) {
		        var i, cond, visible,
		            fn = initPhase ? defaults.onChangeVisibility : formModel.options.onChangeVisibility;

		        for (i = 0; i < formModel.conditionals.length; i++) {
		            cond = formModel.conditionals[i];
		            visible = eval(cond.condition);
		            fn(cond.$element[0], visible);
		            cond.$element.data('valEnabled', visible);
		        }
		    },
		    onValidateChanged: function (fieldElement, isValid, validatorName) {
		        var $errorSpan, fieldName,
					errorClass = this.viewModel.options.errorClass;

		        if (isValid) {
		            if (this.$errorSpan !== undefined) {
		                this.errorMessage = null;
		                if (this.$errorSpan.data('valMessageFor') === undefined) {
		                    this.$errorSpan.remove();
		                    this.$errorSpan = undefined;
		                } else {
		                    this.$errorSpan.html('');
		                }
		            }

		            this.$errorMarkers.removeClass(errorClass);
		            if (this.viewModel.options.autoErrorClass) {
		                this.$forElements.removeClass(errorClass);
		                this.$element.removeClass(errorClass);
		            }
		        } else {
		            $errorSpan = this.$errorSpan;
		            fieldName = this.$element.data('field');
		            if ($errorSpan === undefined) {
		                $errorSpan = $('*[data-val-message-for="' + fieldName + '"]', getForm(fieldElement));
		                if ($errorSpan.length === 0) {
		                    $errorSpan = undefined;
		                }
		            }
		            if ($errorSpan === undefined) {
		                $errorSpan = $('<span />');
		                $errorSpan.addClass(errorClass);
		                this.$element.after($errorSpan);
		            }
		            if ($errorSpan === null) {
		                throw 'unable create error span for field ' + fieldName;
		            }

		            this.errorMessage = this.validators[validatorName].message;
		            $errorSpan.html(this.errorMessage);
		            this.$errorSpan = $errorSpan;

		            this.$errorMarkers.addClass(errorClass);
		            if (this.viewModel.options.autoErrorClass) {
		                this.$forElements.addClass(errorClass);
		                this.$element.addClass(errorClass);
		            }
		        }
		    },		    
		    onValidatorEnabledChanged: function (fieldElement, validatorName, enabled) {
		        var field, validatorClass,
					$field = $(fieldElement),
					fieldName = $field.data('field');

		        if (!enabled) {
		            this.options.onValidateChanged.call(this.fields[fieldName], fieldElement, true);
		        }
		        if (this.options.autoValidatorClass) {
		            field = getField(this, fieldName);
		            validatorClass = this.options.autoValidatorClassPrefix + validatorName;
		            if (enabled) {
		                field.$forElements.addClass(validatorClass);
		                $field.addClass(validatorClass);
		            } else {
		                field.$forElements.removeClass(validatorClass);
		                $field.removeClass(validatorClass);
		            }
		        }
		    },		    
		    validateOnChange: false,validateOnKeyUp: false,
            validationMode: 'focusOut' //'focusOutWhenChanged'
		},        
        createFieldModel = function (formModel, $field) {
            var validatorName, msg,
				fieldName = $field.data('field'),
				fieldModel = {
				    errorMessage: null,
				    $element: $field,
				    viewModel: formModel,
				    validators: {},
				    $errorMarkers: $("*[data-val-marker='" + fieldName + "']"),
				    $forElements: $("*[data-label-for='" + fieldName + "'],*[data-val-message-for='" + fieldName + "']"),
				    getValue: function () {
				        var evalFn, evalWrapper,
							value = $field.data('fieldValue');

				        if (value !== undefined) {
				            return value;
				        }

				        evalFn = $field.data('fieldEval');
				        if (evalFn !== undefined) {
				            // ReSharper disable UnusedParameter
				            evalWrapper = function (field) {
				                // ReSharper restore UnusedParameter
				                value = eval(evalFn);
				            };
				            evalWrapper(this.$element[0]);
				            if (value !== undefined) {
				                return value;
				            }
				        }

				        if ($field.is('input')) {
				            switch ($field.attr('type').toLowerCase()) {
				                case 'checkbox':
				                    return $field.is(':checked');
				            }
				        }

				        return $field.val();
				    },
				    setValue: function (value) {
				        var fieldSetFn;
				        
				        if ($field.data('fieldValue') !== undefined) {
				            $field.data('fieldValue', value);
				            return;
				        }
				        
				        fieldSetFn = $field.data('fieldSet');
				        if (fieldSetFn !== undefined) {
				            eval(fieldSetFn);
				            return;
				        }
				            
				        if ($field.is('input')) {
				            switch ($field.attr('type').toLowerCase()) {
				                case 'checkbox': {
				                    if (value === true) {
				                        $field.attr("checked", "checked");
				                    } else {
				                        $field.attr("checked", null);
				                    }
                                    break;
				                }
				            }
				        }
				        
				        $field.val(value);
				    },
				    validate: function (data) {
				        var i, valInst,
							wasValid = this.errorMessage === null,
							$el = this.$element,
							sortedValidators = [];

				        this.errorMessage = null;
				        while ($el.data(viewModelSelector) === undefined) {

				            if ($el.data('valEnabled') === false) {
				                return true;
				            }
				            $el = $el.parent();
				        }

				        for (i in this.validators) {
				            if (this.validators.hasOwnProperty(i)) {
				                sortedValidators.push({ validator: this.validators[i], name: i });
				            }
				        }
				        sortedValidators = sortedValidators.sort(function (first, second) { return second.validator.priority - first.validator.priority; });
				        for (i = 0; i < sortedValidators.length; i++) {
				            valInst = sortedValidators[i].validator;
				            if (valInst.enabled && !valInst.func(this, data)) {
				                if (wasValid || this.errorMessage !== sortedValidators[i].validator.message) {
				                    this.viewModel.options.onValidateChanged.call(this, $field[0], false, sortedValidators[i].name);
				                }
				                return false;
				            }

				        }
				        if (!wasValid) {
				            this.viewModel.options.onValidateChanged.call(this, $field[0], true);
				        }
				        return true;
				    }
				};
         
            for (validatorName in validators) {
                if (validators.hasOwnProperty(validatorName)) {
                    msg = $field.data('val' + validatorName.charAt(0).toUpperCase() + validatorName.slice(1));
                    if (msg !== undefined) {
                        fieldModel.validators[validatorName] = $.extend({}, validators[validatorName], { message: msg, enabled: true });
                    }
                }
            }

            $field.data(fieldModelSelector, fieldModel);
            $field.change(function () {
                var thisFieldModel = $(this).data(fieldModelSelector);
                if (thisFieldModel.viewModel.options.validateOnChange) {
                    thisFieldModel.validate();
                }
                if (fieldModel.$element.data('layoutChangeNotify') === true) {
                    thisFieldModel.viewModel.options.onRefreshLayout(thisFieldModel.viewModel, false);
                }
            });

            return fieldModel;
        },
        initializeButtons = function ($target) {
            $('*[data-form-button]', $target).each(function () {
                $(this).click(function () {
                    var $this = $(this),
						buttonAction = $this.data('formButton'),
						form = $this.ajaxForm();

                    if (form !== undefined && form !== null) {
                        form.executeButtonAction(buttonAction, $this.data('initiator'));
                    }
                    return undefined;
                }).focus(function () {
                    gotFocus($(this).ajaxForm());
                });
            });
        },
        initializeFields = function (formModel) {
        		    $('*[data-field]', $(formModel.form)).each(function () {
        		        var $field = $(this),
                            fieldName = $field.data('field'),
                            fieldModel = createFieldModel(formModel, $field);

        		        formModel.fields[fieldName] = fieldModel;

        		        $field.focus(function () {
        		            var $this = $(this);

        		            $this.data("valueOnFocus", $this.data(fieldModelSelector).getValue());

        		            gotFocus(formModel);
        		        }).blur(function () {
        		            formModel.$prevField = $(this);
        		            formModel.prevFieldBlur = new Date().getTime();
        		        });

        		        if ($field.is('input') && ($field.attr('type').toLowerCase() === 'text' || $field.attr('type').toLowerCase() === 'password')) {
        		            $field.keydown(function (e) {
        		                var $this = $(this);

        		                if ((e.keyCode || e.which) === keys.enter) {
        		                    $this.data("valueOnKeyDownEnter", $this.data(fieldModelSelector).getValue());
        		                }
        		            }).keyup(function (e) {
        		                var $this = $(this),
                                    form = $this.ajaxForm(),
                                    thisFieldModel = $this.data(fieldModelSelector),
                                    valueEquals = thisFieldModel.getValue() === $this.data("valueOnKeyDownEnter"),
                                    keyCode = e.keyCode || e.which;

        		                if (keyCode === keys.enter) {
        		                    if (valueEquals) {
        		                        e.preventDefault();
        		                        if (form !== undefined && form !== null) {
        		                            form.submit();
        		                        }
        		                    }
        		                } else if (form.options.validateOnKeyUp && keyCode !== keys.tab && keyCode !== keys.shift && keyCode !== keys.ctrl && keyCode !== keys.alt) {
        		                    if (!valueEquals) {
        		                        thisFieldModel.validate({ initiator: "keyUp", keyCode: keyCode });
        		                    }
        		                }
        		            });
        		        }
        		    });
        		},
		initializeValidators = function (formModel) {
		    var i, j, field;

		    for (i in formModel.fields) {
		        if (formModel.fields.hasOwnProperty(i)) {
		            field = formModel.fields[i];
		            for (j in field.validators) {
		                if (field.validators.hasOwnProperty(j)) {
		                    formModel.options.onValidatorEnabledChanged.call(formModel, field.$element[0], j, true);
		                }
		            }
		        }
		    }
		},
        initializeVisibleConditions = function (formModel, $target) {
		    $('*[data-form-visible-condition]', $target).each(function () {
		        var $this = $(this),
					formVisibleCondition = $this.data('formVisibleCondition');

		        if (formVisibleCondition !== undefined && formVisibleCondition !== null) {
		            formVisibleCondition = formVisibleCondition.replace(/\{:(.*?):\}/g, function (group, fieldName) {
		                getField(formModel, fieldName);
		                return 'formModel.fields["' + fieldName + '"].getValue()';
		            });
		        }

		        formModel.conditionals.push({ $element: $this, condition: formVisibleCondition });
		    });
        },
		registerBasicButtonActions = function (formModel) {
		    registerButtonAction(formModel, 'submit', function (initiator) {
		        formModel.submit(initiator);
		    });
		    registerButtonAction(formModel, 'reset', function () {
		        formModel.reset();
		    });
		    registerButtonAction(formModel, 'validate', function () {
		        formModel.validate();
		    });
		},
		registerBasicValidators = function () {
		    registerValidator('required', 200, function (field, data) {
		        if (data !== undefined) { return undefined; }
		        var initialValue = field.$element.data('valRequiredInitialValue');
                if (initialValue === undefined) {
                    if (field.$element.is("input[type=checkbox]")) {
                        initialValue = true;
                    } else {
                        initialValue = '';
                    }
                }
                
		        return field.getValue() !== initialValue;
		    });
		    registerValidator('length', 190, function (field, data) {
		        if (data !== undefined) { return undefined; }
		        var length = field.getValue().length,
					minLength = field.$element.data('valLengthMin'),
					maxLength = field.$element.data('valLengthMax');

		        return (minLength === undefined || parseInt(minLength, 10) <= length) && (maxLength === undefined || parseInt(maxLength, 10) >= length);
		    });
		    registerValidator('email', 110, function (field, data) {
		        if (data !== undefined) { return undefined; }
		        var val = field.getValue(),
					regexEmail = /^[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+(?:[a-zA-Z]{2}|com|org|net|gov|mil|biz|edu|info|mobi|name|aero|asia|cat|coop|int|jobs|museum|post|pro|tel|travel|xxx)\b$/;

		        return val === '' || regexEmail.test(val);
		    });
		    registerValidator('regex', 110, function (field, data) {
		        if (data !== undefined) { return undefined; }
		        var val = field.getValue(),
				expr = field.$element.data('valRegexExpr'),
				match = expr.match(new RegExp('^/?(.*?)/?(g?i?m?y?)$')),
				regex = match[2] === undefined ? new RegExp(match[1]) : new RegExp(match[1], match[2]);

		        return val === '' || regex.test(val);
		    });
		    registerValidator('range', 110, function (field, data) {
		        if (data !== undefined) { return undefined; }
		        var val = field.getValue(),
					value = parseFloat(val),
					minValue = field.$element.data('valRangeMin'),
					maxValue = field.$element.data('valRangeMax');

		        return val === '' || ((minValue === undefined || parseFloat(minValue) <= value) && (maxValue === undefined || parseFloat(maxValue) >= value));
		    });
		    registerValidator('custom', 100, function (field, data) {
		        if (data !== undefined) { return undefined; }
		        var caller,
					value = field.getValue(),
					fnCustom = field.$element.data('valCustomCode'),
					result = true;

		        if (fnCustom !== undefined) {
		            // ReSharper disable UnusedParameter
		            caller = function (fieldElement, actualValue) {
		                // ReSharper restore UnusedParameter
		                result = eval(fnCustom);
		            };
		            caller(field.$element[0], value);
		        }
		        return result;
		    });
		},
		registerButtonAction = function (formModel, actionName, func) {
		    formModel.buttonActions[actionName] = func;
		},		
        registerValidator = function (name, priority, validateFunc) {
            validators[name] = {
                priority: priority,
                func: validateFunc
            };
        },
		readChangeVisibilityAttribute = function (formModel, $target, opts) {
		    var override, base;

		    override = $target.data('onChangeVisibility');
		    if (override !== undefined) {
		        base = opts.onChangeVisibility;
		        opts.onChangeVisibility = function (target, visible) {
		            if (eval(override) !== false) {
		                base.call(formModel, target, visible);
		            }
		        };
		    }
		},
        readOptionsFromAttributes = function (formModel) {
            var override,
				opts = $.extend({}, defaults),
				$target = $(formModel.form);

            readChangeVisibilityAttribute(formModel, $target, opts);
            readValidateChangedAttribute(formModel, $target, opts);
            readRefreshLayoutAttribute($target, opts);
            readValidatorEnabledChangedAttribute(formModel, $target, opts);

            override = $target.data('autoErrorClass');
            if (override !== undefined) {
                opts.autoErrorClass = override === 'true';
            }

            override = $target.data('autoValidatorClass');
            if (override !== undefined) {
                opts.autoValidatorClass = override === 'true';
            }

            override = $target.data('autoValidatorClassPrefix');
            if (override !== undefined) {
                opts.autoValidatorClassPrefix = override;
            }

            override = $target.data('errorClass');
            if (override !== undefined) {
                opts.errorClass = override;
            }

            override = $target.data('validationMode');
            if (override !== undefined) {
                opts.validationMode = override;
            }

            override = $target.data('validateOnKeyUp');
            if (override !== undefined) {
                opts.validateOnKeyUp = override === 'true';
            }

            override = $target.data('validateOnChange');
            if (override !== undefined) {
                opts.validateOnChange = override === 'true';
            }

            return opts;
        },
        readRefreshLayoutAttribute = function ($target, opts) {
            var override, base;

            override = $target.data('onRefreshLayout');
            if (override !== undefined) {
                base = opts.onRefreshLayout;
                opts.onRefreshLayout = function (formModel, initPhase) {
                    if (eval(override) !== false) {
                        base(formModel, initPhase);
                    }
                };
            }
        },
		readValidateChangedAttribute = function (formModel, $target, opts) {
		    var override, base, field;

		    override = $target.data('onValidateChanged');
		    if (override !== undefined) {
		        base = opts.onValidateChanged;
		        opts.onValidateChanged = function (fieldElement, isValid, validatorName) {
		            if (eval(override) !== false) {

		                field = getField(formModel, $(fieldElement).data('field'));
		                base.call(field, fieldElement, isValid, validatorName);
		            }
		        };
		    }
		},		
		readValidatorEnabledChangedAttribute = function (formModel, $target, opts) {
		    var override, base;

		    override = $target.data('onValidatorEnabledChanged');
		    if (override !== undefined) {
		        base = opts.onValidatorEnabledChanged;
		        opts.onValidatorEnabledChanged = function (fieldElement, validatorName, enabled) {
		            if (eval(override) !== false) {
		                base.call(formModel, fieldElement, validatorName, enabled);
		            }
		        };
		    }
		},
		updateOptionsFromParams = function (formModel) {
		    var i, data = $(formModel.form).data();

		    for (i in data) {
		        if (data.hasOwnProperty(i)) {
		            if (i.indexOf('option') === 0) {
		                formModel.options[i.substr(6)] = data[i];
		            }
		        }
		    }
		};

    // ReSharper disable InconsistentNaming
    function AjaxForm(formTarget, options) {
        // ReSharper restore InconsistentNaming
        registerBasicValidators();

        var $target = $(formTarget),
			formName = $target.data('formName');

        forms[formName] = this;
        $.extend(this, {
            form: formTarget,
            name: formName,
            fields: {},
            buttonActions: {},
            conditionals: [],
            $validationSummary: $('*[data-val-summary-for="' + formName + '"]')
        });

        this.options = $.extend({}, readOptionsFromAttributes(this), options);
        this.$prevField = null,
        this.prevFieldBlur = null,
        registerBasicButtonActions(this);
        updateOptionsFromParams(this);
        initializeFields(this);
        initializeValidators(this);
        initializeButtons($target);
        initializeVisibleConditions(this, $target);
        this.options.onRefreshLayout(this, true);
    }

    $.extend(AjaxForm.prototype, {
        buildData: function () {
            var i, json = {};
            for (i in this.fields) {
                if (this.fields.hasOwnProperty(i)) {
                    json[i] = this.fields[i].getValue();
                }
            }
            return json;
        },
        executeButtonAction: function (action, initiator) {
            var handler = this.buttonActions[action];

            if (handler === undefined || handler === null) {
                throw "Error: Unable resolve button action '" + action + "'!";
            }
            handler.call(this, initiator);
        },
        getFieldValue: function (fieldName) {
            var field = getField(this, fieldName);

            return field.getValue();
        },
        setFieldValue: function(fieldName, value) {
            var field = getField(this, fieldName);
            
            field.setValue(value);
        },
        getFieldElement: function (fieldName) {
            var field = getField(this, fieldName);
            
            return field.$element[0];
        },
        refreshLayout: function () {
            this.options.onRefreshLayout(this, false);
        },
        registerButtonAction: function (actionName, func) {
            registerButtonAction(this, actionName, func);
        },
        reset: function () {
            $(':input', $(this.form)).filter('*[data-field]').each(function () {
                $(this).val(undefined);
            });
        },
        setValidatorEnabled: function (validatorName, enabled, fieldName) {
            var i, self = this,
				setValidator = function (field) {
				    var validator = field.validators[validatorName];

				    if (validator !== undefined && validator !== null) {
				        if (validator.enabled !== enabled) {
				            validator.enabled = enabled;
				            self.options.onValidatorEnabledChanged.call(self, field.$element[0], validatorName, enabled);
				        }
				    }
				};

            if (fieldName === undefined) {
                for (i in this.fields) {
                    if (this.fields.hasOwnProperty(i)) {
                        setValidator(this.fields[i]);
                    }
                }
            } else {
                setValidator(this.fields[fieldName]);
            }
        },
        submit: function (initiator) {
            var actionUrl, handler, caller, location,
				$target = $(this.form);

            var submitData = this.submitGetData(initiator);
            if (submitData == undefined) {
                return;
            }

            actionUrl = $target.data('actionUrl');
            if (actionUrl !== undefined) {
                $.ajax({
                    type: 'POST',
                    url: actionUrl,

                    dataType: 'json',
                    contentType: 'application/json',
                    data: JSON.stringify(submitData),
                    success: function (data) {
                        handler = $target.data('onSuccess');
                        if (handler !== undefined) {
                            // ReSharper disable UnusedParameter
                            // ReSharper disable DuplicatingLocalDeclaration
                            caller = function (data, initiator, formModel) {
                                // ReSharper restore DuplicatingLocalDeclaration
                                // ReSharper restore UnusedParameter
                                eval(handler);
                            };
                            caller(data, initiator, this);
                        }
                    },
                    error: function (data) {
                        handler = $target.data('onError');
                        if (handler !== undefined) {
                            // ReSharper disable UnusedParameter
                            // ReSharper disable DuplicatingLocalDeclaration
                            caller = function (data, initiator, formModel) {
                                // ReSharper restore DuplicatingLocalDeclaration
                                // ReSharper restore UnusedParameter
                                eval(handler);
                            };
                            caller(data, initiator, this);
                        } else {
                            throw 'Error: Form ' + $target.data('formName') + ' submit error! - Response: ' + data.responseText;
                        }
                    },
                    complete: function (xhr) {
                        location = xhr.getResponseHeader('Location');
                        if (location) {
                            window.location = location;
                        }
                    }
                });
                return;
            }

            handler = $target.data('onSubmit');
            if (handler !== undefined) {
                // ReSharper disable UnusedParameter
                // ReSharper disable DuplicatingLocalDeclaration
                caller = function (data, initiator, formModel) {
                    // ReSharper restore DuplicatingLocalDeclaration
                    // ReSharper restore UnusedParameter
                    eval(handler);
                };
                caller(submitData.data, initiator, this);
                return;
            }

            throw 'Error: Can\'t submit form ' + $target.data('formName') + '!';
        },
        submitGetData: function (initiator) {
            if (!this.validate()) {
                return undefined;
            }
            return { data: this.buildData(), initiator: initiator };
        },
        validate: function (fieldName, data) {
            var i, handler, caller, errorMessage, ul,
				isFormValid = true,

				errors = [];

            if (fieldName !== undefined) {
                if (!this.fields[fieldName].validate(data)) {
                    isFormValid = false;
                }
            } else {
                for (i in this.fields) {
                    if (this.fields.hasOwnProperty(i)) {
                        if (!this.fields[i].validate(data)) {
                            isFormValid = false;
                        }
                    }
                }
            }

            handler = $(this.form).data('onValidate');
            if (handler !== undefined) {
                // ReSharper disable UnusedParameter
                caller = function (formModel, isValid) {
                    // ReSharper restore UnusedParameter
                    if (!eval(handler)) {
                        isFormValid = false;
                    }
                };
                caller(this, isFormValid);
            }

            this.$validationSummary.html('');
            if (!isFormValid) {
                for (i in this.fields) {
                    if (this.fields.hasOwnProperty(i)) {
                        errorMessage = this.fields[i].errorMessage;
                        if (errorMessage !== null && errorMessage !== undefined) {

                            errors.push(errorMessage);
                        }
                    }
                }

                ul = $("<ul />");
                $.each(errors, function (index, item) {
                    $("<li />").html(item).appendTo(ul);
                });
                ul.appendTo(this.$validationSummary);
            }

            return isFormValid;
        }
    });

    $.fn.ajaxForm = function () {
        var result, form, actual;

        this.each(function () {
            form = getForm(this);
            if (form !== undefined && form !== null) {
                actual = form.data(viewModelSelector);
                if (result !== undefined && actual !== result) {
                    throw "Error: unable resolve single form from selected elements!";
                }
                result = actual;
            }
        });
        return result;
    };

    $.fn.ajaxFormParse = function (options) {
        $(formSelector, this).each(function () {
            if (!$.data(this, viewModelSelector)) {
                $.data(this, viewModelSelector, new AjaxForm(this, options || {}));
            }
        });
        $("*[data-form-button][data-form-name]", $(formSelector)).click(function () {
            var form = AjaxForms.getByName($(this).data("formName"));

            if (form !== undefined && form !== null) {
                form.executeButtonAction($(this).data("formButton"), $(this).data("initiator"));
            }
        });
    };

    $(function () {
        $(window.document).ajaxFormParse();
    });

    return {
        getByName: function (formName) {
            return forms[formName];
        },
        registerValidator: registerValidator
    };
}(jQuery, window));

// ----------------------------------------------------------------
// jQuery extensions
// ----------------------------------------------------------------
(function ($) {

    // [name] is the name of the event "click", "mouseover", .. 
    // same as you'd pass it to bind()
    // [fn] is the handler function
    $.fn.bindFirst = function (name, fn) {
        // bind as you normally would
        // don't want to miss out on any jQuery magic
        this.on(name, fn);

        // Thanks to a comment by @Martin, adding support for
        // namespaced events too.
        this.each(function () {
            var handlers = $._data(this, 'events')[name.split('.')[0]];
            // take out the handler we just inserted from the end
            var handler = handlers.pop();
            // move it at the beginning
            handlers.splice(0, 0, handler);
        });
    };

    $.fn.uniqueId = function (prefix, overwrite) {
        return this.each(function () {
            if (!this.id || overwrite) {
                this.id = EwCore.newUniqueId(prefix);
            }
        });
    };

}(jQuery));

// ----------------------------------------------------------------
// Compatibility fixes
// ----------------------------------------------------------------
if (!Array.prototype.indexOf) {
    Array.prototype.indexOf = function (obj, start) {
        for (var i = (start || 0), j = this.length; i < j; i++) {
            if (this[i] === obj) { return i; }
        }
        return -1;
    };
};

// disable default ajax cache for get requests
$(function () {
    $.ajaxSetup({ cache: false });    
});