package com.trafficaudit.holiday.service;

import org.junit.jupiter.api.Test;

import java.lang.reflect.Method;
import java.math.BigDecimal;

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

class HolidayBulletinServiceTest {

    @Test
    void formatsTableRatiosAsSignedPercentages() throws Exception {
        HolidayBulletinService service = new HolidayBulletinService(null);

        assertEquals("-4.7%", ratio(service, "95.3", "100"));
        assertEquals("1.0%", ratio(service, "101", "100"));
        assertEquals("0%", ratio(service, "100", "100"));
        assertEquals("0%", ratio(service, "10004", "10000"));
        assertEquals("—", ratio(service, "100", null));
        assertEquals("—", ratio(service, "100", "0"));
    }

    private String ratio(HolidayBulletinService service, String current, String base) throws Exception {
        Method method = HolidayBulletinService.class.getDeclaredMethod("ratio", BigDecimal.class, BigDecimal.class);
        method.setAccessible(true);
        BigDecimal currentValue = current == null ? null : new BigDecimal(current);
        BigDecimal baseValue = base == null ? null : new BigDecimal(base);
        return (String) method.invoke(service, currentValue, baseValue);
    }
}