var surveyActive = true;
var surveyRatio = 0.1; // how many out of 1 should get surveyed

// these two are used by JavaScript within the page:
var doPrompt = false;
var promptText = '';



if (surveyActive) {
	// cookieVal can have one of four values:
	// empty: never been cookied or refuses cookies
	// n: don't prompt this user
	// y: do prompt this user
	// x: this user has already taken the survey
	var cookieVal = '';
	var cookieOffset = document.cookie.indexOf("CHsurvey=");
	if (cookieOffset != -1) {
		// "CHsurvey=" is 9 characters long
		cookieVal = document.cookie.substring(cookieOffset + 9, cookieOffset + 9 + 1);
	}

	if (cookieVal == '') {
		// not previously cookied
		if (Math.random() < surveyRatio) {
			cookieVal = 'y';
		} else {
			cookieVal = 'n';
		}
		document.cookie = 'CHsurvey=' + cookieVal + '; path=/wgbh/commandingheights/';
/*
		// document.cookie doesn't get updated this quickly...
		// commenting this out means
		//  a) un-cookied users get prompted 1 in 10 no matter what
		//  b) cookied users get prompted on their first page
		if (document.cookie.indexOf("CHsurvey=") != -1) {
			// they were unable to take the cookie; don't give them the survey
			cookieVal = 'n';
		}
*/
	}

	if (cookieVal == 'y') {

		var promptTextHi = '<div class="surveyhi">&gt;&gt;&nbsp;<a href="../survey/index.html" class="surveyhi">Tell us how we can improve this site.</a></div>';
		var promptTextLo = '<div class="surveylo">&gt;&gt;&nbsp;<a href="../survey/index.html" class="surveylo">Tell us how we can improve this site.</a></div>';

		promptText = promptTextLo;
		if (window.location.pathname.indexOf('/hi/') != -1) {
			promptText = promptTextHi;
		}

		doPrompt = true;
	}
}

function surveyed() {
		document.cookie = 'CHsurvey=x; path=/wgbh/commandingheights/';
}