package oving2;

import java.util.ArrayList;

import sun.misc.PerformanceLogger;

import acm.program.ConsoleProgram;

/*
 * @startuml
 * class ConsoleProgram {
 * }
 * class ConsoleRPN {
 *  Stack<Double> operandStack
 *  void push(double value)
 *  double pop(double defaultValue)
 *  +void init()
 *  +void run()
 * }
 * ConsoleProgram <|-- ConsoleRPN
 * @enduml
 */

public class ConsoleRPN extends ConsoleProgram {

    private ArrayList<Double> stack;


    public void init(){

    }
    public void run(){
        stack = new ArrayList<Double>();
        String inputTegn;
        double tall;
        char operat;

        boolean sjekke;

        while(true){
            println("Opperand stack: " + stack);
            inputTegn = readLine("Skriv inn operand eller operator: ");
            sjekke = erTall(inputTegn);
            if(sjekke){
                tall = Double.parseDouble(inputTegn);
                stack.add(tall);
            }
            else {
                operat = inputTegn.charAt(0);
                nytttall = performOperation(operat);
            }

            if(inputTegn == ""){
                break;
            }
        }


    }
    public boolean erTall(String inputTegn){
        try {
            Double.parseDouble(inputTegn);
        }
        catch(NumberFormatExeception nfe){
            return false;
        }
        return true;
    }

    public void add(){

    }
    public double performOperation(char operat){
        switch(operat){
        case '+': return stack.get(stack.size()) + stack.get(stack.size()-1);
        case '-': return stack.get(stack.size()) - stack.get(stack.size()-1);
        case '*': return stack.get(stack.size()) * stack.get(stack.size()-1);
        case '/': return stack.get(stack.size()) / stack.get(stack.size()-1);
        default: println("Opps en feil gitt");

        }
        return -1;

    }




}