// Helper Function for Caret positioning
// Gratefully pulled from the Masked Input Plugin by Josh Bush
// http://digitalbush.com/projects/masked-input-plugin

$.fn.caret=function(begin,end){	
	if(this.length==0) return;
	if (typeof begin == 'number') {
		end = (typeof end == 'number')?end:begin;  
		return this.each(function(){
			if(this.setSelectionRange){
				this.focus();
				this.setSelectionRange(begin,end);
			}else if (this.createTextRange){
				var range = this.createTextRange();
				range.collapse(true);
				range.moveEnd('character', end);
				range.moveStart('character', begin);
				range.select();
			}
		});
	} else {
		if (this[0].setSelectionRange){
			begin = this[0].selectionStart;
			end = this[0].selectionEnd;
		}else if (document.selection && document.selection.createRange){
			var range = document.selection.createRange();			
			begin = 0 - range.duplicate().moveStart('character', -100000);
			end = begin + range.text.length;
		}
		return {begin:begin,end:end};
	}       
};

function getNthPos(searchStr, char, pos)
{
	var charCount = 0;
	var strArr = searchStr.split(char);

	if(pos == 0)
		return 0;

	for(i = 0; i < pos; i++)
	{
		if(i >= strArr.length)
			return -1;

		// +1 because we split out some characters
		charCount += strArr[i].length + char.length;
	}

	return charCount;
}


$(function() {

	$('#validate, #reformat, #compress').click(function()
	{
		$('#results_header, #loadSpinner').show();

		var reformat = (this.id == "reformat") ? "yes" : (this.id == "compress" ? "compress" : "no");

		$.post('/ajax/validate', { "json": $('#json_input').val(), "reformat": reformat },
			function(jsonResponse) { 
				try {
					var response = eval('(' + jsonResponse + ')');
				}
				catch(err)
				{
					var response = new Object();
					response.result = "Unable to load. Please contact Arc90.";
					response.responseCode = "-1";
				}

				$('#results').html(response.result);
				$('#loadSpinner').hide();

				if(reformat)
				{
					$('#json_input').val(response.prettyJSON);
				}
				
				if(response.responseCode == "0")
				{
					$('#results').removeClass('error').addClass('success');
					$('div.linedwrap').removeClass('redBorder').addClass('greenBorder');
				}
				else
				{
					$('#results').removeClass('success').addClass('error');
					$('div.linedwrap').removeClass('greenBorder').addClass('redBorder');

					
					lineMatches = response.result.match(/line ([0-9]*)/);

					if(lineMatches && typeof lineMatches == "object" && lineMatches.length > 1)
					{
						lineNum = parseInt(lineMatches[1]);
						str = $('#json_input').val();

						if(lineNum == 1)
							lineStart = 0;
						else
							lineStart = getNthPos(str, "\n", lineNum-1);

						var lineEnd = str.indexOf("\n", lineStart);
						if(lineEnd < 0)
							lineEnd = str.length;

						$('#json_input').focus().caret(lineStart,lineEnd);
					}

				}
			}
		);
		return false;

	});

	$('#json_input').keyup(function() {
		$('div.linedwrap').removeClass('greenBorder').removeClass('redBorder');
	}
	).linedtextarea({
		selectedClass: 'lineselect'
	}).focus();

	$('#reset').click(function() { $('#json_input').val('').focus(); } );

	$('#faqButton').click(function() { $('#faq').slideToggle(); } );


});