/*
 * calculator.js
 * Written by Sam Minnee, Totally Digital
 * For enquiries, contact sam@totallydigital.co.nz
 */
 
function calculatePremium() {
	// Get insured amount
	var insuredAmount = document.forms.CalculatorForm.InsuredAmount.value;
	insuredAmount = insuredAmount.replace(/[^0-9.\-]/g, '');
	insuredAmount = parseFloat(insuredAmount);
	if(isNaN(insuredAmount)) insuredAmount = 0;
	document.forms.CalculatorForm.InsuredAmount.value = formatNumber(insuredAmount);
	
	var premium, numOver;
	// Calculated premium based on that
	if(insuredAmount <= 500000) {
		premium = 225;
	}
	else if(insuredAmount <= 1000000) {
		numOver = getNumOver(insuredAmount, 500000);
		premium = 225 + numOver * 0.7;
	}
	else if(insuredAmount <= 1500000) {
		numOver = getNumOver(insuredAmount, 1000000);
		premium = 575 + numOver * 0.65;
	}
	else if(insuredAmount <= 2000000) {
		numOver = getNumOver(insuredAmount, 1500000);
		premium = 900 + numOver * 0.6;
	}
	else {
		numOver = getNumOver(insuredAmount, 2000000);
		premium = 1200 + numOver * 0.55;
	}
	document.forms.CalculatorForm.CalculatedPremium.value = formatNumber(premium);
}

/*
 * Handle a keypress in the premium field
 */
function calculatePremium_keyPress() {
	if(event.keyCode == 13) {
		calculatePremium();
		event.returnValue = false;
	}
}

// Gets the number of 1000s over a given value, rounding up
function getNumOver(value, over) {
	numOver = (value - over) / 1000;		
	if(Math.round(numOver) < numOver)
		numOver = Math.round(numOver)+1;
	else
		numOver = Math.round(numOver);
	return numOver;
}

function formatNumber(val) {
	// Split into wholnumber.decimal
	val = parseInt(val * 100);
	if(val == 0) return "0.00";
	val = val.toString();
	
	var wholeNumber = val.substr(0, val.length-2);
	var decimal = val.substr(val.length-2);
	
	// Split into th,ous,and blocks
	if(wholeNumber.length > 3) {
		var i = wholeNumber.length % 3;
		if(i == 0) i = 3;		
		var newWholeNumber = wholeNumber.substr(0,i);
		for(;i<wholeNumber.length;i+=3) {
			newWholeNumber += ',' + wholeNumber.substr(i,3);
		}
		wholeNumber = newWholeNumber;
	}
	
	return wholeNumber + '.' + decimal;	
}