import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.math.BigDecimal;
import java.math.RoundingMode;

public class Controler {
    private BigDecimal tmpNumber, tmpNumber2;
    private int lastOperation = 0;
    private Model model;
    private View view;
    private boolean flag;


    public Controler(Model model, View view) {
        this.model = model;
        this.view = view;
        view.setSolution("0");
        view.addZeroListener(new NumberListener('0'));
        view.addOneListener(new NumberListener('1'));
        view.addTwoListener(new NumberListener('2'));
        view.addThreeListener(new NumberListener('3'));
        view.addFourListener(new NumberListener('4'));
        view.addFiveListener(new NumberListener('5'));
        view.addSixListener(new NumberListener('6'));
        view.addSevenListener(new NumberListener('7'));
        view.addEightListener(new NumberListener('8'));
        view.addNineListener(new NumberListener('9'));
        view.addDotListener(new DotListener());
        view.addAdditionListener(new OperationListener(13));
        view.addSubtractionListener(new OperationListener(14));
        view.addMultiplicationListener(new OperationListener(15));
        view.addDivisionListener(new OperationListener(16));
        view.addSqrtListener(new SqrtListener(17));
        view.addCalculationListener(new CalculationListener());
        view.addCListener(new ClearListener());
        view.addDelListener(new DelListener());

    }

    class NumberListener implements ActionListener {
        char c;

        public NumberListener(char c) {
            this.c = c;
        }

        @Override
        public void actionPerformed(ActionEvent actionEvent) {
            String tmpSol=view.getSolution();
            if(c=='0'&&tmpSol.length()>=2){
                tmpSol+='0';
            }else tmpSol = getNewSolution(view.getSolution(), c).setScale(10, RoundingMode.HALF_UP).stripTrailingZeros().toString();
            // 10 miejsc po przecinku, usuwa zera


            view.setSolution(tmpSol);
        }
    }

    class DelListener implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent actionEvent) {
            String tmp=view.getSolution();
            if(tmp.length()>1) {
                String res = tmp.substring(0, tmp.length() - 1);
                view.setSolution(res);
            }else view.setSolution("0");
        }
    }
    class OperationListener implements ActionListener {
        int c;

        public OperationListener(int c) {
            this.c = c;
        }

        @Override
        public void actionPerformed(ActionEvent actionEvent) {
            tmpNumber=new BigDecimal(view.getSolution());
            if(lastOperation==0){
                lastOperation=c;
                view.setSolution("0");
            }else{
                view.setSolution("0");
                lastOperation=c;
                //refresh();
            }

        }
    }
    class SqrtListener implements ActionListener {
        int c;

        public SqrtListener(int c) {
            this.c = c;
        }

        @Override
        public void actionPerformed(ActionEvent actionEvent) {
            tmpNumber=new BigDecimal(view.getSolution());
            lastOperation=c;
            refresh();

        }
    }
    class ClearListener implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent actionEvent) {
            view.setSolution("0");
            flag=false;
        }
    }

    class CalculationListener implements ActionListener{
        public void actionPerformed(ActionEvent actionEvent){
            if(flag==false)tmpNumber2=new BigDecimal(view.getSolution());
            if(!(model.subtract(tmpNumber,new BigDecimal(view.getSolution())).equals(new BigDecimal(0))))    tmpNumber2=new BigDecimal(view.getSolution());
           try{refresh();}catch(Exception e){}
        }

    }

    class DotListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent actionEvent) {
        String tmpSol = view.getSolution();
        if (!(tmpSol.contains(".")) && tmpSol.length() < 12) {
            tmpSol += ".";
        }
        view.setSolution(tmpSol);
    }

}


    public static void main(String[] args){
        Model model=new Model();
        View view =new View();
        Controler controler=new Controler(model, view);

        }
    public static BigDecimal getNewSolution(String tmpSolution, char c){
        if(c=='.'){
            return new BigDecimal(tmpSolution);
        }
        if(tmpSolution.length()<12){
            tmpSolution+=c;
        }
        return new BigDecimal(tmpSolution);
    }
    public static String correctResult(String tmp){
        String res="";
        if(tmp.length()>12){
            res=tmp.substring(0,12);
            return res;
        }
        return tmp;
    }

    public void refresh() {

            switch (lastOperation) {
                case 13:
                   // System.out.println(tmpNumber2 + " " + view.getSolution());
                    System.out.println("Sum "+tmpNumber+" and "+tmpNumber2);
                    tmpNumber = model.add(tmpNumber, tmpNumber2);

                    break;
                case 15:
                    System.out.println("multiply "+tmpNumber+" and "+tmpNumber2);
                    tmpNumber = model.multiply(tmpNumber, tmpNumber2);


                    break;
                case 14:
                    System.out.println("Subtract "+tmpNumber+" and "+tmpNumber2);
                    tmpNumber = model.subtract(tmpNumber,tmpNumber2);


                    break;
                case 16:
                    System.out.println("Divide "+tmpNumber+" and "+tmpNumber2);
                    tmpNumber = model.divide(tmpNumber,tmpNumber2);


                    break;
                case 17:
                    tmpNumber=model.sqrt(tmpNumber);
                    break;
                default:
                    System.out.println("msg");
                    break;
            }
            if (tmpNumber != null) view.setSolution(correctResult(tmpNumber.stripTrailingZeros().toString()));
            flag = true;


    }


}