Calendar

/*
 * Predefined Settings
 */

var model = {
	daysObj: {
		0: [0,1,2,3,4,5,6],
		1: [1,2,3,4,5,6,0],
		2: [2,3,4,5,6,0,1],
		3: [3,4,5,6,0,1,2],
		4: [4,5,6,0,1,2,3],
		5: [5,6,0,1,2,3,4],
		6: [6,0,1,2,3,4,5]
	},
	daysName: ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'],
	monthName: ['January','February','March', 'April', 'May', 'June', 'July','August', 'September', 'October', 'November', 'December']
};



/*
 * Util Modules
 */

var util = {
	generateDate: function(year,month, outDay,cb){
		return function(day){

			day = day || outDay;

			var date = new Date(year, month, day);

			return cb(date);
		}
	},
	render: function(month,year,daysArr,monthArr){

		console.log("    "+model.monthName[month]+" "+year);

		var subheader = daysArr.map(function(item){
			return model.daysName[item];
		}).join(" ");

		console.log(subheader);

		monthArr.forEach(function(arr){
			console.log(arr.join(" "));
		});
	},
	bufferArr: function(arr, startingIndex){ // Fill up the buffer space in arr

		for(var j=0; j < startingIndex; j++){
			arr[j] = "  ";
		}
		return arr;
	},
	buildRest: function(arr, startingIndex, total){ // Build up the rest of the arr

		for(var i = 1; i <= total; i++){

			if(i < 10){
				arr[startingIndex] = i+" ";
			} else {
				arr[startingIndex] = i;
			}

			startingIndex++;
		}

		return arr;
	},
	buildNaiveArr: function(startingIndex,total){ //Build the entire naive array

		return this.buildRest(this.bufferArr([],startingIndex),startingIndex,total);
	}

};



/*
 * Calender
 */

function calendar(year,month,day){

	day = day || 0;

	var totalDays = util.generateDate(year,month,0,function(date){
		return date.getDate();
	});

	var today = util.generateDate(year,month-1,null,function(date){
		return date.getDay();
	});

	var daysArr = model.daysObj[day],
		startingIndex = daysArr.indexOf(today(1));

	var arr = util.buildNaiveArr(startingIndex,totalDays()),
		monthArr = [];

	//Split naiveArray into weeks
	while(arr.length>0){
		monthArr.push(arr.splice(0,7));
	}

	util.render(month-1,year,daysArr,monthArr);

}

calendar(2014,2,4);