package kr.co.vividnext.sodalive.extensions

import org.junit.jupiter.api.Assertions.assertEquals
import org.junit.jupiter.api.Assertions.fail
import org.junit.jupiter.api.Test
import java.time.LocalDateTime
import java.time.ZoneId

class LocalDateTimeExtensionsTest {
    @Test
    fun shouldConvertToUtcUsingKstByDefault() {
        val localDateTime = LocalDateTime.of(2026, 4, 9, 10, 0)

        val utcDateTime = invokeConvertToUtc(localDateTime)

        assertEquals(LocalDateTime.of(2026, 4, 9, 1, 0), utcDateTime)
    }

    @Test
    fun shouldConvertToUtcUsingProvidedTimezone() {
        val localDateTime = LocalDateTime.of(2026, 4, 9, 10, 0)

        val utcDateTime = invokeConvertToUtc(localDateTime, ZoneId.of("Asia/Bangkok"))

        assertEquals(LocalDateTime.of(2026, 4, 9, 3, 0), utcDateTime)
    }

    private fun invokeConvertToUtc(localDateTime: LocalDateTime, timeZone: ZoneId = ZoneId.of("Asia/Seoul")): LocalDateTime {
        return try {
            val method = Class.forName("kr.co.vividnext.sodalive.extensions.LocalDateTimeExtensionsKt")
                .getMethod("convertToUtc", LocalDateTime::class.java, ZoneId::class.java)
            method.invoke(null, localDateTime, timeZone) as LocalDateTime
        } catch (e: ReflectiveOperationException) {
            fail("LocalDateTime.convertToUtc 확장함수를 찾을 수 없습니다.")
        }
    }
}