package sample.controllers;

import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.stage.Modality;
import javafx.stage.Stage;
import sample.Main;
import sample.utils.EvaluateString;

import java.io.IOException;
import java.util.ArrayList;

public class Controller {

    //get the label
    public Label equation = null;
    public Label result = null;

    ArrayList<String> insertions = new ArrayList<>();

    public void insertOperator(String operator){
        equation.setText(equation.getText() + " " + operator + " ");
        insertions.add(" " + operator + " ");
    }

    public void insertNumber(String number){
        equation.setText(equation.getText() + number);
        insertions.add(number);
    }

    public void clear(){
        equation.setText("");
        insertions.clear();
    }

    public void deleteLast(){
        if (!insertions.isEmpty()){

            //remove from the label
            equation.setText(equation.getText().substring(0, (equation.getText().length() - 1) - insertions.get(insertions.size() - 1).length()));

            insertions.remove(insertions.size() - 1);

        }
    }

    public double eval(String expression){
        return EvaluateString.evaluate(expression);
    }

    public void updateAnswer(double answer){
        result.setText("= " + answer);
    }

    public void openHistoryScene(){

        Stage stage = Main.getHistoryStage();

        stage.show();
    }

    //Button Control Handling
    public void onMouseClicked(MouseEvent mouseEvent) {

        Button button = (Button) mouseEvent.getSource();
        String number = button.getText();

        switch(button.getText()){
            case "1":
            case "2":
            case "3":
            case "4":
            case "5":
            case "6":
            case "7":
            case "8":
            case "9":
            case "0":
                insertNumber(number);
                break;
            case "CLEAR":
                clear();
                break;
            case "DELETE":
                deleteLast();
                break;
            case "*":
            case "/":
            case "+":
            case "-":
                insertOperator(button.getText());
                break;
            case "=":
                //Do the calculation
                double result = eval(equation.getText());
                updateAnswer(result);
                //Add to history
                HistoryController.addCalculation(equation.getText(), result);
                break;
            case "HIST":
                openHistoryScene();
                break;
        }

    }


}