var transportInterval = 15; // How many minutes between each transport

var nextTransportSecs = 0;
var nextTransportInterval;

setInterval(activateTransport, 1000 * 60 * transportInterval);



function activateTransport(){
    if(nextTransportInterval != undefined)
        clearInterval(nextTransportInterval);
    initiateAutoTransport();
    lastTransport = new Date();
    nextTransportSecs = 60 * transportInterval;
    nextTransportInterval = setInterval(function(){ nextTransportSecs --;}, 1000);
}

function showRemainingTime(){
    var text;
    if(nextTransportSecs >= 60)
        text = (Math.ceil(nextTransportSecs / 60)).toString() + " minutes";
    else if(nextTransportSecs == 1)
        text = "1 second";
    else if(nextTransportSecs == 0)
        text = "Transport Ready!";
    else
        text = nextTransportSecs.toString() + " seconds";
    alert(text);
}

function resetTimer(){
    nextTransportSecs = 0;
    if(nextTransportInterval != undefined)
        clearInterval(nextTransportInterval);
}

var initTransportBtn = document.createElement("DIV");
var initTransportTxtContainer = document.createElement("DIV");
var initTransportTxt = document.createTextNode("Auto-Transport");

initTransportBtn.appendChild(initTransportTxtContainer);
initTransportBtn.className = "lightbutton160";
initTransportBtn.addEventListener("click", activateTransport, false);

initTransportTxtContainer.appendChild(initTransportTxt);
initTransportTxtContainer.className = "buttontext24";

document.body.appendChild(initTransportBtn);

var getRemainingTimeBtn = document.createElement("DIV");
var getRemainingTimeTxtContainer = document.createElement("DIV");
var getRemainingTimeTxt = document.createTextNode("Remaining Time");

getRemainingTimeBtn.appendChild(getRemainingTimeTxtContainer);
getRemainingTimeBtn.className = "lightbutton160";
getRemainingTimeBtn.addEventListener("click", showRemainingTime, false);

getRemainingTimeTxtContainer.appendChild(getRemainingTimeTxt);
getRemainingTimeTxtContainer.className = "buttontext24";

document.body.appendChild(getRemainingTimeBtn);

var resetTimerBtn = document.createElement("DIV");
var resetTimerTxtContainer = document.createElement("DIV");
var resetTimerTxt = document.createTextNode("Reset Time");

resetTimerBtn.appendChild(resetTimerTxtContainer);
resetTimerBtn.className = "lightbutton160";
resetTimerBtn.addEventListener("click", resetTimer, false);

resetTimerTxtContainer.appendChild(resetTimerTxt);
resetTimerTxtContainer.className = "buttontext24";

document.body.appendChild(resetTimerBtn);