/*
 * Проверки tms2812: фиксируют ожидаемое поведение на воспроизводимых входных данных.
 * Сценарии для навигации по файлу:
 *   test_terminal
 * Тестовые значения и подмены окружения относятся к проверке контракта; они не являются
 * настройками рабочего устройства.
 */

#include <stdio.h>
#include <string.h>

#include "tms2812.h"

static int test_terminal(void)
{
    uint8_t output[20], digits[12] = {0x81, 2, 4, 8, 9, 0x20, 0x10, 0x20, 0x40, 0x80, 3, 4};
    const uint8_t ping[] = {0x0a, 0x38, 0, 1, 0, 0, 0xf0, 0xb4};
    uint8_t reply[] = {0x0a, 0x38, 0x65, 0xa5, 0, 0, 0xaf, 0x9b, 0, 0};
    const uint8_t test_prefix[] = {7, 66, 25, 0, 18, 0};
    size_t size;
    if (tms2812_build_memory_request(10, 0, 0, 0, output, sizeof output) != 8U ||
        memcmp(output, ping, sizeof ping) != 0) return 10;
    if (tms2812_build_memory_request(10, TMS2812_CMD_POKE, 0x12345678UL, 0xABCD,
        output, sizeof output) != 12U || output[2] != 0x78 || output[5] != 0x12 ||
        output[6] != 0xCD || output[7] != 0xAB || output[8] != 0 || output[9] != 0 ||
        tms2812_crc16(output, 12U) != 0U) return 11;
    if (tms2812_build_memory_request(10, 99, 0, 0, output, sizeof output) != 0U ||
        tms2812_build_memory_request(10, 56, 0, 0, output, 7) != 0U) return 12;
    if (tms2812_build_test_request(7, 25, 18, digits, 12, output, sizeof output) != 20U ||
        memcmp(output, test_prefix, sizeof test_prefix) || memcmp(output + 6, digits, 12) ||
        tms2812_crc16(output, 20) != 0U) return 13;
    if (tms2812_build_test_request(7, 25, 18, digits, 11, output, sizeof output) != 0U ||
        tms2812_build_fixed_request(7, 65, NULL, 1, output, sizeof output) != 0U) return 14;
    for (size = 8; size <= 10; ++size)
        if (tms2812_validate_response(reply, size, 10, 56, 10, 1) != TMS2812_OK) return 15;
    if (tms2812_validate_response(reply, 7, 10, 56, 10, 1) != TMS2812_ERROR_LENGTH ||
        tms2812_validate_response(reply, 8, 10, 56, 10, 0) != TMS2812_ERROR_LENGTH ||
        tms2812_validate_response(reply, 10, 11, 56, 10, 1) != TMS2812_ERROR_HEADER) return 16;
    reply[2] ^= 1;
    if (tms2812_validate_response(reply, 10, 10, 56, 10, 1) != TMS2812_ERROR_CRC) return 17;
    return 0;
}

int main(void)
{
    int terminal_status = test_terminal();
    if (terminal_status != 0) return terminal_status;
    uint8_t request[TMS2812_UPLOAD_REQUEST_SIZE];
    static const uint8_t prefix[] = {
        0x05U, 0x34U, 0x78U, 0x56U, 0x34U, 0x12U,
        0x00U, 0x10U, 0x00U, 0x00U
    };
    uint8_t reply[4U + TMS2812_UPLOAD_RESPONSE_OVERHEAD];
    uint8_t decoded[4];
    uint16_t crc;

    if (tms2812_build_upload_request(5U, 0x12345678UL, 0x1000U,
            request, sizeof request) != sizeof request ||
        memcmp(request, prefix, sizeof prefix) != 0) return 1;
    reply[0] = 5U;
    reply[1] = TMS2812_CMD_UPLOAD;
    reply[2] = 0x10U; reply[3] = 0x20U; reply[4] = 0x30U; reply[5] = 0x40U;
    crc = tms2812_crc16(reply, 6U);
    reply[6] = (uint8_t)crc;
    reply[7] = (uint8_t)(crc >> 8);
    memset(&reply[8], 0, 4U);
    if (tms2812_decode_upload_response(reply, sizeof reply, 5U, 4U,
            decoded, sizeof decoded) != TMS2812_OK ||
        memcmp(decoded, &reply[2], sizeof decoded) != 0) return 2;
    reply[6] ^= 1U;
    if (tms2812_validate_upload_response(reply, sizeof reply, 5U, 4U)
            != TMS2812_ERROR_CRC) return 3;
    puts("PM67/TMS320F2812 upload protocol tests passed");
    return 0;
}