package com.hawhamburg.micr0bu

import com.hawhamburg.micr0bu.domain.asn1.VamContent
import com.hawhamburg.micr0bu.domain.asn1.VamUperCodec
import org.junit.Assert.assertEquals
import org.junit.Test

/**
 * Pins the VAM encoder against bytes this code did not produce.
 *
 * ## Where the expected bytes come from
 * asn1tools 0.167, compiling the ETSI modules vanetza-idf ships (asn1/release2:
 * TS102894-2v241-CDD.asn, TS103300-3v231/VAM-PDU-Descriptions.asn and its motorcyclist container),
 * encoding the same values as a Python dict: the same toolchain the colleague's reference VBS
 * (microbu-esp32c5/station-link/python/microbu_link/vbs.py) builds its VAMs with. Station
 * 0x12345678, fix at Unix ms 1790170000123 (generationDeltaTime 45819), 53.5546667 N
 * 10.0223889 E, 5.43 m/s, heading 123.4 deg, -1.26 m/s^2; every confidence and the altitude
 * unavailable, as the encoder sends them.
 */
class VamUperCodecTest {

    private fun ByteArray.hex(): String = joinToString("") { "%02x".format(it) }

    private fun content(includeLowFrequency: Boolean, accuracyM: Float? = 3.0f) = VamContent(
        stationId = 0x12345678,
        timestamp = 1_790_170_000_123L,
        latitude = 53.5546667,
        longitude = 10.0223889,
        accuracyM = accuracyM,
        speedMps = 5.43,
        headingDeg = 123.4,
        accelerationMps2 = -1.26,
        includeLowFrequency = includeLowFrequency,
    )

    @Test
    fun `VAM with the low-frequency container matches asn1tools`() {
        assertEquals(
            "031012345678b2fb400aac85a15b8a18ec88f30f3708eddd0f8002697e087ff24f322220",
            VamUperCodec.encode(content(includeLowFrequency = true)).hex(),
        )
    }

    @Test
    fun `VAM without the low-frequency container matches asn1tools`() {
        assertEquals(
            "031012345678b2fb000aac85a15b8a18ec88f30f3708eddd0f8002697e087ff24f30",
            VamUperCodec.encode(content(includeLowFrequency = false)).hex(),
        )
    }

    @Test
    fun `unknown accuracy encodes the confidence ellipse as unavailable`() {
        assertEquals(
            "031012345678b2fb000aac85a15b8a18ec8fffffff08eddd0f8002697e087ff24f30",
            VamUperCodec.encode(content(includeLowFrequency = false, accuracyM = null)).hex(),
        )
    }
}