var app = angular.module('timer');

app.factory('progressBarService', function() {

var ProgressBarService = function() {};

/**

* calculate the remaining time in a progress bar in percentage

* @param {momentjs} startValue in seconds

* @param {integer} currentCountdown, where are we in the countdown

* @param {integer} remainingTime, remaining milliseconds

* @param {integer} endTime, end time, can be undefined

* @param {integer} coutdown, original coutdown value, can be undefined

*

* joke : https://www.youtube.com/watch?v=gENVB6tjq_M

* @return {float} 0 --> 100

*/

ProgressBarService.prototype.calculateProgressBar = function calculateProgressBar(startValue, remainingTime, endTimeAttr, coutdown) {

var displayProgressBar = 0,

endTimeValue,

initialCountdown;

remainingTime = remainingTime / 1000; //seconds

if(endTimeAttr !== null){

endTimeValue = moment(endTimeAttr);

initialCountdown = endTimeValue.diff(startValue, 'seconds');

displayProgressBar = remainingTime * 100 / initialCountdown;

}

else {

displayProgressBar = remainingTime * 100 / coutdown;

}

displayProgressBar = 100 - displayProgressBar; //To have 0 to 100 and not 100 to 0

displayProgressBar = Math.round(displayProgressBar * 10) / 10; //learn more why : http://stackoverflow.com/questions/588004/is-floating-point-math-broken

if(displayProgressBar > 100){ //security

displayProgressBar = 100;

}

return displayProgressBar;

};

return new ProgressBarService();

});