#include "unity.h"
#include "celrs/serial.h"
#include "Mocklog_write.h"

void setUp(void)    { Mocklog_write_Init(); }
void tearDown(void) { Mocklog_write_Verify(); Mocklog_write_Destroy(); }

void test_open_valid_path(void) {
    cel_serial_port* port = cel_serial_open("COM3", 400000);
    TEST_ASSERT_NOT_NULL(port);
    cel_serial_close(port);
}

void test_open_null_path(void) {
    TEST_ASSERT_NULL(cel_serial_open(NULL, 400000));
}

void test_open_preserves_path(void) {
    cel_serial_port* port = cel_serial_open("/dev/ttyUSB0", 400000);
    TEST_ASSERT_NOT_NULL(port);
    /* path is stored internally; verify by roundtrip behavior */
    cel_serial_close(port);
}

void test_close_null(void) {
    /* Should not crash */
    cel_serial_close(NULL);
}

void test_read_returns_zero_stub(void) {
    cel_serial_port* port = cel_serial_open("COM3", 400000);
    TEST_ASSERT_NOT_NULL(port);
    uint8_t buf[16];
    /* Stub implementation returns 0 */
    size_t n = cel_serial_read(port, buf, sizeof(buf), 100);
    TEST_ASSERT_EQUAL_UINT(0, n);
    cel_serial_close(port);
}

void test_write_returns_zero_stub(void) {
    cel_serial_port* port = cel_serial_open("COM3", 400000);
    TEST_ASSERT_NOT_NULL(port);
    uint8_t buf[4] = {0xC8, 0x10, 0x80, 0x03};
    /* Stub implementation returns 0 */
    size_t n = cel_serial_write(port, buf, sizeof(buf));
    TEST_ASSERT_EQUAL_UINT(0, n);
    cel_serial_close(port);
}

void test_flush_no_crash(void) {
    cel_serial_port* port = cel_serial_open("COM3", 400000);
    TEST_ASSERT_NOT_NULL(port);
    cel_serial_flush(port); /* should not crash */
    cel_serial_close(port);
}

void test_flush_null(void) {
    cel_serial_flush(NULL); /* should not crash */
}

int main(void) {
    UNITY_BEGIN();
    RUN_TEST(test_open_valid_path);
    RUN_TEST(test_open_null_path);
    RUN_TEST(test_open_preserves_path);
    RUN_TEST(test_close_null);
    RUN_TEST(test_read_returns_zero_stub);
    RUN_TEST(test_write_returns_zero_stub);
    RUN_TEST(test_flush_no_crash);
    RUN_TEST(test_flush_null);
    return UNITY_END();
}