$( function(){

	$("#loadtype, #paytype").buttonset();
	
	var buzzratesel = $("#buzzratesel"), counratesel = $("#counratesel"), years = $("#years"),
		buzzrate = $("#buzzrate"), counrate = $("#counrate");
		
	//动态生成利率下拉框
	for( var key in window.houseloanbuzzrate ){
		var item = window.houseloanbuzzrate[ key ];
		var opt = $("<option value='" + key + "'>").text( item.title );
		if ( item.isdefault )
			opt.attr("selected", "selected" );
		
		buzzratesel.append( opt );		
	}
	for( var key in window.houseloancounrate ){
		var item = window.houseloancounrate[ key ];
		var opt = $("<option value='" + key + "'>").text( item.title );
		if ( item.isdefault )
			opt.attr("selected", "selected" );
			
		counratesel.append( opt );			
	}	

	//动态更改利率	
	buzzratesel.change( function(){
		var v = buzzratesel.val(), y = parseint( years.val() ) <= 5 ? 0 : 1 ;
		if ( v == "-1" )
			buzzrate.val("0.00");
		else	
			buzzrate.val( (window.houseloanbuzzrate[ v ].rate[ y ] * 100).tofixed(2) );	
	} );
	counratesel.change( function(){
		var v = counratesel.val(), y = parseint(years.val() ) <= 5 ? 0 : 1 ;
		if ( v == "-1"  )
			counrate.val("0.00");
		else	
			counrate.val( (window.houseloancounrate[ v ].rate[ y ] * 100).tofixed(2) );	
	} );
	years.change( function(){
		counratesel.change();
		buzzratesel.change();
	} ).change();
	var years = $("#years"), month = $("#month");
	//计算期次
	function getterm(){
		return parseint(years.val() || "0") * 12 + parseint(month.val() || "0");
	}
	years.keyup( function(){
		$("#term").text( getterm() );
	} );
	month.change( function(){
		$("#term").text( getterm() );
	} );
	
	//当利率更改后反馈下拉框
	buzzrate.blur( function(){
		counrate.find("option:selected").removeattr("selected");
		var v = $(this).val(), y = parseint( years.val() ) <= 5 ? 0 : 1;
		for( var key in houseloanbuzzrate ){
			if ( (houseloanbuzzrate[key].rate[ y ] * 100).tofixed(2) == v ){
				buzzrate.find("option[value='"+ key +"']").attr("selected", "selected" );
				return;				
			}
		}
	});
	counrate.blur( function(){
		counrate.find("option:selected").removeattr("selected");
		var v = counrate.val(), y = parseint( years.val() ) <= 5 ? 0 : 1;
		for( var key in houseloancounrate ){
			if ( (houseloancounrate[key].rate[ y ] * 100).tofixed(2) == v ){
				counrate.find("option[value='"+ key +"']").attr("selected", "selected" );
				return;				
			}
		}
	});		
	
	//隐藏不必须的行
	 $("input[name='radio']").change( function(){
	 	var v = $("input[name='radio']:checked").val();
		if ( v == "1" ){
			$(".buzztr").show();
			$(".countr").hide();
			if ( $("#loadbuzzamt").val() == "0" )
				$("#loadbuzzamt").val( "" );
			if ( $("#loadcounamt").val() == "" )
				$("#loadcounamt").val( "0" );
		}else if ( v == "2" ){
			$(".buzztr").hide();
			$(".countr").show();
			if ( $("#loadcounamt").val() == "0" )
				$("#loadcounamt").val( "" );
			if ( $("#loadbuzzamt").val() == "" )
				$("#loadbuzzamt").val( "0" );
		}else{
			$(".buzztr").show();
			$(".countr").show();
		}
	 } ).change();
	
	//重置按钮
	$("#resetbtn").click( function(){
		$(".list").height( "auto" );
		$("#container").children("dd").remove();
	} );	
	
	//提交表单
	$("#houseloan").submit( function( e ){
		e.preventdefault();
		
		var ba = parsefloat( $("#loadbuzzamt").val() ) * 10000,
			ca = parsefloat( $("#loadcounamt").val() ) * 10000,
			n = getterm(),
			paytype = $("input[name='radiopay']:checked").val(),
			loadtype = $("input[name='radio']:checked").val(),
			br = parsefloat( buzzrate.val() ) /100 /12,
			cr = parsefloat( counrate.val() ) /100 /12 ;
	
		var  ct = $("#container");
		ct.children("dd").remove();
			;
		if ( isnan(ca) ) ca = 0;
		if ( isnan(ba) ) ba = 0;
		
		var totalint = totalamt = buzzintamt = counintamt = 0;
	
		//商业贷款
		if ( loadtype == "1" ){
			ca = 0;
			$("#buzzintamttr, #counintamttr").hide();
		}else if ( loadtype == "2" ){
		//公积金贷款
			ba = 0;	
			$("#buzzintamttr, #counintamttr").hide();
		}else{
			$("#buzzintamttr, #counintamttr").show();
		}
		
		var blist, clist;
	
		if (paytype == "1") {
			//等额本息
			blist = averageinterest( n, ba, br);
			clist = averageinterest( n, ca, cr);
		}else if (paytype == "2"){
			//等额本金
			blist = averagecapital( n, ba, br);
			clist = averagecapital( n, ca, cr);			
		}
		var dlist = [];
		for (var i=0; i<n; i++) {
			var b = blist[i], c = clist[i];
			dlist.push([b[0] + c[0],
						b[1] + c[1],
						b[2] + c[2],
						b[3] + c[3]
					  ]);
			buzzintamt += 	b[0];
			counintamt += 	c[0];	  
			totalint += b[0] + c[0];
			totalamt += b[2] + c[2];		  			
		}	
		
		var ofrag=document.createdocumentfragment();
		for (var i=0; i<dlist.length; i++) {
			var tmp = $("<dd>").html(  "<div>" + (i+1) + "</div>" +
										"<div>" + dlist[i][2].tofixed(2) + "</div>" +
										"<div>" + dlist[i][0].tofixed(2) + "</div>" +
									   "<div>" + dlist[i][1].tofixed(2) + "</div>" +
										"<div>" + math.abs(dlist[i][3]).tofixed(2) + "</div>" +	
										"<div class='clear'></div>")[0];
			ofrag.appendchild( tmp );				
		}
		$(".list").height( 200 );
		ct.append( ofrag );
		
		$("#buzzintamt").val( buzzintamt.tofixed(2) );
		$("#counintamt").val( counintamt.tofixed(2) );
		$("#intamt").val( totalint.tofixed(2) );
		$("#fullamt").val( totalamt.tofixed(2) );
		
		window.scrollto( 0, 250 );
	} );
	
	//等额本金
	function averagecapital( n, m, r ){
		var list = [];
		var b = m / n, d = m;
		for (var i=0; i< n ; i++) {
			// ai = m×（n－i+1）÷n×（r％÷12）
			d = i == 0 ? m : list[ i-1 ][3]; 
			var i = d * r ;
			list.push( [ i, b, b+i, d-b] );	
		}
		return list;			
	}
	
	//等额本息
	function averageinterest( n, m, r ){
		if ( r == 0 )
			return averagecapital( n, m, r );
		var list = [];
		//ci= m×（r％÷12）×（1+ r％÷12）n÷[（1+ r％÷12）n—1]
		var c = m * r * math.pow( 1 + r, n ) / ( math.pow( 1+r, n ) -1 ), d = 0;
		if (isnan(c)) c = 0;
		for (var i=0; i< n ; i++) {
			// i = 剩余本金 × 月利率
			d = i == 0 ? m : list[ i-1 ][3]; //剩余本金
			var i = d * r ;
			list.push( [ i, c-i, c, d-( c-i )] );	
		}	
		return list;			
	}	
} );