package io.tswf.dima;

import java.util.Scanner;

public class CalculatorApp {

    public static final String OPERATION_PLUS = "+";
    public static final String OPERATION_MINUS = "-";
    public static final String OPERATION_MULTIPLY = "*";
    public static final String OPERATION_DIVISION = ":";
    public static final String OPERATION_POWER = "^";

    public static final String[] AVAILABLE_OPERATIONS = { OPERATION_DIVISION, OPERATION_MINUS, OPERATION_PLUS, OPERATION_MULTIPLY, OPERATION_POWER };

    public static final Scanner SCANNER = new Scanner(System.in);

    // Проверяет поддерживается ли операция
    public static boolean isOperationSupported(String operationDigit) {
        for (String supportedOperationDigit : AVAILABLE_OPERATIONS) {
            if (supportedOperationDigit.equals(operationDigit)) {
                return true;
            }
        }

        return false;
    }

    public static void printInputNameText(String inputName) {
        System.out.print("Введите " + inputName + " >>> ");
    }

    public static float readNumberFromConsole(String numberName) {
        printInputNameText(numberName);
        return SCANNER.nextFloat();
    }

    public static String readStringFromConsole(String stringName) {
        printInputNameText(stringName);
        return SCANNER.next();
    }

    public static void main(String[] args) {
        float number1 = readNumberFromConsole("первое число");
        String operation = readStringFromConsole("операцию");
        float number2 = readNumberFromConsole("второе число");

        System.out.print("Ответ: ");

        if(!isOperationSupported(operation))  {
            System.out.println("Неизвестная операция!");
            return;
        }

        if (OPERATION_DIVISION.equals(operation)) {
            if (number2 != 0) {
                float division = number1 / number2;
                System.out.println(division);
            } else {
                System.out.println("На 0 делить нельзя");
            }
        }

        if (OPERATION_PLUS.equals(operation)) {
            float addition = number1 + number2;
            System.out.println(addition);
        }

        if (OPERATION_MINUS.equals(operation)) {
            float subtraction = number1 - number2;
            System.out.println(subtraction);
        }

        if (OPERATION_MULTIPLY.equals(operation)) {
            float multiplication = number1 * number2;
            System.out.println(multiplication);
        }
        if (OPERATION_POWER.equals(operation)) {
            double power = Math.pow(number1, number2);
            System.out.println(power);
        }
    }
}