// This file contains a class for you to extend with your solution.

function MeasurementAppController()
{
    var self = this;
    var cameraVideoPageController = null;
    this.cameraVideoPageInitialised = function(controller)

    {
        cameraVideoPageController = controller;
        var self=this

        //BUTTONS
        var height =
            {title:   "Set camera height", onClick: "measurementAppController.height()"}
        var topAngle =
            {title:   "Angle to apex", onClick: "measurementAppController.topAngle()"}
        var bottomAngle =
            {title:   "Angle to base", onClick: "measurementAppController.bottomAngle()"}
        var distanceAndHeight =
            {title:   "Calculate distance + height", onClick: "measurementAppController.distanceAndHeight()"}

        var buttons = [height, topAngle, bottomAngle, distanceAndHeight]
       cameraVideoPageController.addButtons(buttons)
       setInterval(function() {cameraVideoPageController.setHeadsUpDisplayHTML("angle: " + betaValue.toFixed(0) + '°')}, 0) //this function is called continously so the angle of the phone can always be seen
    }

    //FUNCTIONS
    this.height = function ()
    {
        var self=this
        this.setHeight=prompt("Please enter your approximate height(m)")
    }

    //SET THE TOP ANGLE
    this.topAngle = function() //set the top angle
	{
        var self=this
        this.setTopAngle = betaValue.toFixed(0)
        if (this.setTopAngle < 180 && this.setTopAngle > 0) // the top angle must be between these specifications
        {
            cameraVideoPageController.displayMessage("The angle to the object's APEX is set as " + this.setTopAngle + '°')//pops up little window notifying the user they have set the angle
        }
            else // picks up any errors
            {
                alert ("Please set an angle to the apex between 0° and 180°")
            }
    }


    //SET THE BOTTOM ANGLE
    this.bottomAngle = function() //set the bottom angle
	{
        var self=this
        this.setBottomAngle =betaValue.toFixed(0) // rounds to nearest degree so values aren't so jumpy
        if (this.setBottomAngle < 90 && this.setBottomAngle > 0) // the bottom angle must be below 90 degrees or else it is impossible to calculate
        {
            cameraVideoPageController.displayMessage("The angle to the object's BASE is set as " + this.setBottomAngle + '°') //pops up little window notifying the user they have set the angle
        }
            else // picks up any errors if angle is not <90 degrees
            {
                alert ("Please set an angle to the base between 0° and 90°")
            }
    }

    //SET THE DISTANCE AND HEIGHT
    this.distanceAndHeight = function() //calculate distance and height
    {
      var self=this

      if (this.setTopAngle > 90 && this.setTopAngle<180 && this.setBottomAngle <90 && this.setBottomAngle > 0) //forumla for calculating distance + height if apex is above camera height
      {
        this.distance = this.setHeight*Math.tan(this.convert(this.setBottomAngle))
        this.totalHeight = this.setHeight*(1 + (Math.tan(this.convert(this.setTopAngle-90))/Math.tan(this.convert(90-this.setBottomAngle)))) //formula for calculating height --> i did it all in one step as i thought it would get too messy and complicated if i created seperate functions
          alert("The object is " + this.distance.toFixed(2) + " metres away and it is " + this.totalHeight.toFixed(2) + "metres high") //popup window of the values
      }
        else if (this.setTopAngle > 0 && this.setTopAngle < 90 && this.setBottomAngle <90 && this.setBottomAngle > 0) //forumla for calculating distance + height if apex is below camera height
        {   this.distance = this.setHeight*Math.tan(this.convert(this.setBottomAngle)) //forumla for calculating distance
            this.totalHeight = this.setHeight - (this.distance/Math.tan(this.convert(this.setTopAngle)))
            alert("The object is " + this.distance.toFixed(2) + " metres away and it is " + this.totalHeight.toFixed(2) + "metres high") //popup window of the value
        }
        else
        {
        alert ("Unable to calculate distance + height!") //picks up any errors
        }
    }

    //CONVERT DEGREES TO RADIANS
    this.convert = function(x)
    {
        return Math.PI/180 * x
    }
}

    // OTHER METHODS

//get Beta Value
function handleOrientation(event)
{
    var self=this
    this.betaValue= event.beta;
}
window.addEventListener("deviceorientation", handleOrientation, true)