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'use strict';

var
	_ = require('underscore'),
	$ = require('jquery'),
	ko = require('knockout'),
	
	Types = require('%PathToCoreWebclientModule%/js/utils/Types.js'),
	
	Browser = require('%PathToCoreWebclientModule%/js/Browser.js'),
	UserSettings = require('%PathToCoreWebclientModule%/js/Settings.js')
;

ko.bindingHandlers.autosize = {
	'init': function (oElement, fValueAccessor, fAllBindingsAccessor, oViewModel, bindingContext) {
		var
			jqEl = $(oElement),
			oOptions = fValueAccessor(),
			iHeight = jqEl.height(),
			iOuterHeight = jqEl.outerHeight(),
			iInnerHeight = jqEl.innerHeight(),
			iBorder = iOuterHeight - iInnerHeight,
			iPaddingTB = iInnerHeight - iHeight,
			iMinHeight = oOptions.minHeight ? oOptions.minHeight : 0,
			iMaxHeight = oOptions.maxHeight ? oOptions.maxHeight : 0,
			iScrollableHeight = oOptions.scrollableHeight ? oOptions.scrollableHeight : 1000,// max-height of .scrollable_field
			oAutosizeTrigger = oOptions.autosizeTrigger ? oOptions.autosizeTrigger : null,
				
			/**
			 * @param {boolean=} bIgnoreScrollableHeight
			 */
			fResize = function (bIgnoreScrollableHeight) {
				var iPadding = 0;

if (Browser.firefox)
				{
					iPadding = Types.pInt(jqEl.css('padding-top')) * 2;
				}

if (iMaxHeight)
				{
					/* 0-timeout to get the already changed text */
					setTimeout(function () {
						if (jqEl.prop('scrollHeight') < iMaxHeight)
						{
							jqEl.height(iMinHeight - iPaddingTB - iBorder);
							jqEl.height(jqEl.prop('scrollHeight') + iPadding - iPaddingTB);
						}
						else
						{
							jqEl.height(iMaxHeight - iPaddingTB - iBorder);
						}
					}, 100);
				}
				else if (bIgnoreScrollableHeight || jqEl.prop('scrollHeight') < iScrollableHeight)
				{
					setTimeout(function () {
						jqEl.height(iMinHeight - iPaddingTB - iBorder);
						jqEl.height(jqEl.prop('scrollHeight') + iPadding - iPaddingTB);
					}, 100);
				}
			}
		;

jqEl.on('keydown', function(oEvent, oData) {
			fResize();
		});
		jqEl.on('paste', function(oEvent, oData) {
			fResize();
		});

if (oAutosizeTrigger)
		{
			oAutosizeTrigger.subscribe(function (arg) {
				fResize(arg);
			}, this);
		}

fResize();
	}
};

ko.bindingHandlers.fade = {
	'init': function (oElement, fValueAccessor, fAllBindingsAccessor, oViewModel, bindingContext) {
		var jqEl = $(oElement),
			jqElFaded = $('<span class="faded"></span>'),
			oOptions = _.defaults(
				fValueAccessor(), {
					'color': null,
					'css': 'fadeout'
				}
			),
			oColor = oOptions.color,
			sCss = oOptions.css,
			updateColor = function (sColor)
			{
				if (sColor === '')
				{
					return;
				}

var
					oHex2Rgb = hex2Rgb(sColor),
					sRGBColor = "rgba(" + oHex2Rgb.r + "," + oHex2Rgb.g + "," + oHex2Rgb.b
				;

colorIt(sColor, sRGBColor);
			},
			hex2Rgb = function (sHex) {
				// Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
				var
					shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i,
					result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(sHex)
				;
				sHex = sHex.replace(shorthandRegex, function(m, r, g, b) {
					return r + r + g + g + b + b;
				});

return result ? {
					r: parseInt(result[1], 16),
					g: parseInt(result[2], 16),
					b: parseInt(result[3], 16)
				} : null;
			},
			colorIt = function (hex, rgb) {
				if (UserSettings.IsRTL)
				{
					jqElFaded
						.css("filter", "progid:DXImageTransform.Microsoft.gradient(startColorstr='" + hex + "', endColorstr='" + hex + "',GradientType=1 )")
						.css("background-image", "-webkit-gradient(linear, left top, right top, color-stop(0%," + rgb + ",1)" + "), color-stop(100%," + rgb + ",0)" + "))")
						.css("background-image", "-moz-linear-gradient(left, " + rgb + ",1)" + "0%, " + rgb + ",0)" + "100%)")
						.css("background-image", "-webkit-linear-gradient(left, " + rgb + "1)" + "0%," + rgb + ",0)" + "100%)")
						.css("background-image", "-o-linear-gradient(left, " + rgb + ",1)" + "0%," + rgb + ",0)" + "100%)")
						.css("background-image", "-ms-linear-gradient(left, " + rgb + ",1)" + "0%," + rgb + ",0)" + "100%)")
						.css("background-image", "linear-gradient(left, " + rgb + ",1)" + "0%," + rgb + ",0)" + "100%)");
				}
				else
				{
					jqElFaded
						.css("filter", "progid:DXImageTransform.Microsoft.gradient(startColorstr='" + hex + "', endColorstr='" + hex + "',GradientType=1 )")
						.css("background-image", "-webkit-gradient(linear, left top, right top, color-stop(0%," + rgb + ",0)" + "), color-stop(100%," + rgb + ",1)" + "))")
						.css("background-image", "-moz-linear-gradient(left, " + rgb + ",0)" + "0%, " + rgb + ",1)" + "100%)")
						.css("background-image", "-webkit-linear-gradient(left, " + rgb + ",0)" + "0%," + rgb + ",1)" + "100%)")
						.css("background-image", "-o-linear-gradient(left, " + rgb + ",0)" + "0%," + rgb + ",1)" + "100%)")
						.css("background-image", "-ms-linear-gradient(left, " + rgb + ",0)" + "0%," + rgb + ",1)" + "100%)")
						.css("background-image", "linear-gradient(left, " + rgb + ",0)" + "0%," + rgb + ",1)" + "100%)");
				}
			}
		;

jqEl.parent().addClass(sCss);
		jqEl.after(jqElFaded);

if (oOptions.color.subscribe !== undefined)
		{
			updateColor(oColor());
			oColor.subscribe(function (sColor) {
				updateColor(sColor);
			}, this);
		}
	}
};

module.exports = {};