package  {
    import flash.display.MovieClip;
    import fl.controls.TextInput;
    import fl.controls.ComboBox;
    import fl.controls.Label;
    import fl.controls.Button;
    import flash.events.Event;

    public class Document extends MovieClip {

        const MARGIN:int = 20;

        var tallVerdi:Number = 0;
        // tallVerdi er tallet som vises i dsplayet
        //   vil være B i utrykk som A + B
        var tallNr1:Number = 0;
        // tall A i et uttrykk som A + B
        //      A - B   A / B
        var kommando:String = "";

		var presisjon:int = 2;

        var cmbPrecision:ComboBox = new ComboBox;
        var nyttTall:Boolean = true;
        var inpDisplay:TextInput = new TextInput;
        var cmbMode:ComboBox = new ComboBox;
        var lblError:Label = new Label;
        var btnClear:Button = new Button;

        public function Document() {
            // constructor code
            inpDisplay.x = MARGIN;
            inpDisplay.y = MARGIN;
            inpDisplay.width = 200;
            inpDisplay.text = "0";
            inpDisplay.alpha = 0.9;
            inpDisplay.opaqueBackground = 0x00FF00;
            stage.addChild(inpDisplay);

            lblError.x = MARGIN;
            lblError.y = inpDisplay.y + inpDisplay.height + 4;
            lblError.text = "No error";
            //lblError.alpha = 0.9;
            //lblError.opaqueBackground = 0xFF0000;
            stage.addChild(lblError);

            btnClear.x = MARGIN + inpDisplay.width + 4;
            btnClear.y = MARGIN;
            btnClear.label = "CA";
            btnClear.width = 30;
            btnClear.addEventListener("click",tilbakestill);
            stage.addChild(btnClear);

            var btnTall:Button;
            for (var i:int = 0; i < 10; i+=1) {
                btnTall = new Button;
                btnTall.x = MARGIN + 25 * (i % 3);
                btnTall.y = lblError.y + lblError.height + 4 + 25 * int(i/3);
                btnTall.label = String(9-i);
                btnTall.width = 20;
                btnTall.addEventListener("click",settInnTall);
                stage.addChild(btnTall);
            }

            var btnPluss:Button = new Button;
            btnPluss.x = MARGIN + 100;
            btnPluss.y = MARGIN  + lblError.y + lblError.height + 4;
            btnPluss.label = "+";
            btnPluss.width = 30;
            btnPluss.addEventListener("click",operator);
            stage.addChild(btnPluss);

            var btnMinus:Button = new Button;
            btnMinus.x = MARGIN + 135;
            btnMinus.y = MARGIN  + lblError.y + lblError.height + 4;
            btnMinus.label = "-";
            btnMinus.width = 30;
            btnMinus.addEventListener("click",operator);
            stage.addChild(btnMinus);

            var btnMult:Button = new Button;
            btnMult.x = MARGIN + 100;
            btnMult.y = MARGIN  + lblError.y + lblError.height + 4 + 30;
            btnMult.label = "*";
            btnMult.width = 30;
            btnMult.addEventListener("click",operator);
            stage.addChild(btnMult);

            var btnDiv:Button = new Button;
            btnDiv.x = MARGIN + 135;
            btnDiv.y = MARGIN  + lblError.y + lblError.height + 4 + 30;
            btnDiv.label = "/";
            btnDiv.width = 30;
            btnDiv.addEventListener("click",operator);
            stage.addChild(btnDiv);


            var btnSin:Button = new Button;
            btnSin.x = MARGIN + 180;
            btnSin.y = MARGIN  + lblError.y + lblError.height + 4 ;
            btnSin.label = "sin";
            btnSin.width = 30;
            btnSin.addEventListener("click",sinus);
            stage.addChild(btnSin);

            var btnKomma:Button = new Button;
            btnKomma.x = MARGIN + 10;
            btnKomma.y = MARGIN  + lblError.y + lblError.height + 124 ;
            btnKomma.label = ".";
            btnKomma.width = 30;
            btnKomma.addEventListener("click",komma);
            stage.addChild(btnKomma);

            var btnErlik:Button = new Button;
            btnErlik.x = MARGIN + 100;
            btnErlik.y = MARGIN  + lblError.y + lblError.height + 84;
            btnErlik.label = "=";
            btnErlik.width = 40;
            btnErlik.addEventListener("click",erlik);
            stage.addChild(btnErlik);

            cmbPrecision.x = MARGIN + 220;
            cmbPrecision.y = MARGIN  + lblError.y + lblError.height + 4 ;
            cmbPrecision.width = 60;
            cmbPrecision.addEventListener("change",precision);
			cmbPrecision.addItem( { label: "2", value:2 } );
			cmbPrecision.addItem( { label: "4", value:4 } );
			cmbPrecision.addItem( { label: "6", value:6 } );
			cmbPrecision.addItem( { label: "8", value:8 } );
			cmbPrecision.addItem( { label: "10", value:10 } );
            stage.addChild(cmbPrecision);

            visTall();


        }

		function precision(e:Event) {
			presisjon = cmbPrecision.selectedItem.value;
		}

        function erlik(e:Event) {
            switch(kommando) {
                case "+":
                  tallVerdi = tallNr1 + tallVerdi;
                  break;
                case "-":
                  tallVerdi = tallNr1 - tallVerdi;
                  break;
                case "*":
                  tallVerdi = tallNr1 * tallVerdi;
                  break;
                case "/":
                  tallVerdi = tallNr1 / tallVerdi;
                  break;
                case "":
                  break;
                default:
                  break;
            }
            visTall();
            nyttTall = true;
            kommando = "";
        }

        function komma(e:Event) {
            var s:String = inpDisplay.text;
            s = s + ".";
            inpDisplay.text = s;
            tallVerdi = Number(s);
        }

        function sinus(e:Event) {
            tallVerdi = Math.sin(tallVerdi);
            visTall();
        }

        function operator(e:Event) {
            erlik(null);
            tallNr1 = tallVerdi;
            kommando = e.currentTarget.label;
        }


        function visTall() {
             inpDisplay.text = tallVerdi.toFixed(presisjon);
        }

        function tilbakestill(e:Event) {
            lblError.text = "";
            kommando = "";
            tallVerdi = 0;
            tallNr1 = 0;
            nyttTall = true;
            visTall();
        }

        function settInnTall(e:Event) {
            var siffer:String = e.currentTarget.label;
            if (nyttTall) {
                inpDisplay.text = "";
                nyttTall = false;
            }
            inpDisplay.text += siffer;
            tallVerdi = Number(inpDisplay.text);
            //visTall();
        }
    }

}