package de.rwu.easydrop.util;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Modifier;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

class FormattingUtilTest {

    @Test
    void testConstructorIsPrivate()
            throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
        // Check for private constructor
        Constructor<FormattingUtil> constructor = FormattingUtil.class.getDeclaredConstructor();
        assertTrue(Modifier.isPrivate(constructor.getModifiers()));

        // Make sure exception is thrown when instantiating
        constructor.setAccessible(true);
        assertThrows(InvocationTargetException.class, () -> {
            constructor.newInstance();
        });
    }

    @Test
    void testFormatEuro_positiveAmount() {
        double amount = 1234.56;
        String expectedFormattedAmount = "1.234,56 Euro";

        String formattedAmount = FormattingUtil.formatEuro(amount);

        Assertions.assertEquals(expectedFormattedAmount, formattedAmount);
    }

    @Test
    void testFormatEuro_zeroAmount() {
        double amount = 0.0;
        String expectedFormattedAmount = "0,00 Euro";

        String formattedAmount = FormattingUtil.formatEuro(amount);

        Assertions.assertEquals(expectedFormattedAmount, formattedAmount);
    }

    @Test
    void testFormatEuro_negativeAmount() {
        double amount = -789.12;
        String expectedFormattedAmount = "-789,12 Euro";

        String formattedAmount = FormattingUtil.formatEuro(amount);

        Assertions.assertEquals(expectedFormattedAmount, formattedAmount);
    }

    @Test
    void testRemoveSpaces_RemovesAllSpaces() {
        String test1 = FormattingUtil.removeSpaces("this is a test");
        String test2 = FormattingUtil.removeSpaces("another test");
        String test3 = FormattingUtil.removeSpaces(" daring today,  aren't we? ");
        String test4 = FormattingUtil.removeSpaces("hehe");

        assertEquals("thisisatest", test1);
        assertEquals("anothertest", test2);
        assertEquals("daringtoday,aren'twe?", test3);
        assertEquals("hehe", test4);
    }
}