#include "unity.h"
#include "celrs/crsf.h"
#include <string.h>

void setUp(void) {}
void tearDown(void) {}

/* CRC tests — CRC8/DVB-S2 (poly 0xD5) */
void test_crc_empty(void) {
    uint8_t data[1] = {0};
    TEST_ASSERT_EQUAL_UINT8(0x00, cel_crsf_crc(data, 0));
}

void test_crc_single_byte(void) {
    uint8_t data[1] = {0x01};
    uint8_t crc = cel_crsf_crc(data, 1);
    TEST_ASSERT_TRUE(crc != 0); /* non-trivial */
}

void test_crc_known_value(void) {
    /* Verify CRC is deterministic */
    uint8_t data[6] = {0x10, 0x80, 0x03, 0x02, 0x80, 0x01};
    uint8_t crc = cel_crsf_crc(data, 6);
    TEST_ASSERT_TRUE(crc != 0);
    uint8_t crc2 = cel_crsf_crc(data, 6);
    TEST_ASSERT_EQUAL_UINT8(crc, crc2);
}

/* Channel helper tests */
void test_channel_clamp_min(void) {
    TEST_ASSERT_EQUAL_INT16(CEL_CRSF_CH_MIN, cel_crsf_channel_clamp(0));
}

void test_channel_clamp_max(void) {
    TEST_ASSERT_EQUAL_INT16(CEL_CRSF_CH_MAX, cel_crsf_channel_clamp(2048));
}

void test_channel_clamp_mid(void) {
    TEST_ASSERT_EQUAL_INT16(CEL_CRSF_CH_MID, cel_crsf_channel_clamp(CEL_CRSF_CH_MID));
}

int main(void) {
    UNITY_BEGIN();
    RUN_TEST(test_crc_empty);
    RUN_TEST(test_crc_single_byte);
    RUN_TEST(test_crc_known_value);
    RUN_TEST(test_channel_clamp_min);
    RUN_TEST(test_channel_clamp_max);
    RUN_TEST(test_channel_clamp_mid);
    return UNITY_END();
}