// CircularCounter
// Author: Aleksandar Kalanj <alkalanj@yahoo.com>

var COUNTING_DOWN = 0;
var WAITING = 1;
var state;

// Tacno vreme emitovanja jedne od emisija (GMT, sekunde):
var radioTime = 1139083200;

// Vreme trajanja emisije (u sekundama):
var duration = 3600;

// Da li poruku treba ispisati na cirilici:
var isCyrillic = true;

var countDownTime;	// Brojac na dole (u sekundama).

function initCounter(isCyr) {
	isCyrillic = isCyr;
	setCountDownTime();
	countDown();
}

function setCountDownTime() {
	// Trenutno vreme u sekundama.
	var now = Math.round((new Date()).getTime() / 1000);
	while (radioTime + duration < now) {
		// Ako je emisija vec prosla pomera se vreme za 7 dana kasnije.
		radioTime += 7 * 24 * 60 * 60;
	}
	if (radioTime < now) {
		state = WAITING;
		countDownTime = radioTime + duration - now;
	} else {
		state = COUNTING_DOWN;
		countDownTime = radioTime - now;
	}
}

function getDigit(number, digitPosition) {
	if (digitPosition == 1) {
		return number % 10;
	} else if (digitPosition == 2) {
		return parseInt(number / 10) % 10;
	}
}

function countDown() {

	var time = countDownTime;
	var text;
	var displayElement = document.getElementById("countDownText");

	if (state == COUNTING_DOWN) {
		seconds = time % 60;
		minutes = parseInt(time / 60) % 60;
		hours = parseInt(time / (60 * 60)) % 24;
		days = parseInt(time / (24 * 60 * 60)) % 60;
		
		if (isCyrillic) {
			text = "До емисије је остало:<br />";
		} else {
			text = "Do emisije je ostalo:<br />";
		}
		text += "<span style='white-space: nowrap'>";
		text += days;
		if (getDigit(days, 1) == 1 && getDigit(days, 2) != 1) {
			text += (isCyrillic ? " дан, " : " dan, ");
		} else {
			text += (isCyrillic ? " дана, " : " dana, ");
		}
		text += "</span>";
		text += "<span style='white-space: nowrap'>";
		text += hours;
		if (getDigit(hours, 1) == 1 && getDigit(hours, 2) != 1) {
			text += (isCyrillic ? " сат, " : " sat, ");
		} else if ((getDigit(hours, 1) == 2 || getDigit(hours, 1) == 3 ||
		            getDigit(hours, 1) == 4) && getDigit(hours, 2) != 1) {
			text += (isCyrillic ? " сата, " : " sata, ");
		} else {
			text += (isCyrillic ? " сати, " : " sati, ");
		}
		text += "</span>\n";
		text += "<span style='white-space: nowrap'>";
		text += minutes;
		if (getDigit(minutes, 1) == 1 && getDigit(minutes, 2) != 1) {
			text += (isCyrillic ? " минут, " : " minut, ");
		} else {
			text += (isCyrillic ? " минута, " : " minuta, ");
		}
		text += "</span>\n";
		text += "<span style='white-space: nowrap'>";
		text += seconds;
		if (getDigit(seconds, 1) == 1 && getDigit(seconds, 2) != 1) {
			text += (isCyrillic ? " секунд." : " sekund.");
		} else if ((getDigit(seconds, 1) == 2 || getDigit(seconds, 1) == 3 ||
		            getDigit(seconds, 1) == 4) && getDigit(seconds, 2) != 1) {
			text += (isCyrillic ? " секунде." : " sekunde.");
		} else {
			text += (isCyrillic ? " секунди." : " sekundi.");
		}
		text += "</span>\n";
	} else {
		text = (isCyrillic ? "Емисија је у току." : "Emisija je u toku.");
	}

	displayElement.innerHTML = text;

	countDownTime--;
	
	if (countDownTime <= 0) {
		if (state == COUNTING_DOWN) {
			countDownTime = duration;
			state = WAITING;
		} else {
			setCountDownTime();
			state = COUNTING_DOWN;
		}
	}
	
	window.setTimeout("countDown()", 1000);
}