#include "main.h"

/* Private define ------------------------------------------------------------*/
#define DEBOUNCE_DELAY_MS  50
#define BLINK_DELAY_MS     200   // скорость бегущих огней

/* Private variables ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;
UART_HandleTypeDef huart1;

static uint8_t direction = 0;
static uint8_t activeLedIndex = 0; // 0=LD3, 1=LD4, 2=LD5, 3=LD6

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
static void MX_USART1_UART_Init(void);
static void UpdateLEDs(void);
static void Button_Handler(void);

int main(void)
{
    HAL_Init();
    SystemClock_Config();
    MX_GPIO_Init();
    MX_I2C1_Init();
    MX_USART1_UART_Init();

    UpdateLEDs();

    uint32_t previousTick = HAL_GetTick();
    GPIO_PinState lastButtonState;
    GPIO_PinState currentReading;

    lastButtonState = HAL_GPIO_ReadPin(User_Button_GPIO_Port, User_Button_Pin);
    HAL_Delay(DEBOUNCE_DELAY_MS);
    if (HAL_GPIO_ReadPin(User_Button_GPIO_Port, User_Button_Pin) != lastButtonState)
    {
        lastButtonState = HAL_GPIO_ReadPin(User_Button_GPIO_Port, User_Button_Pin);
        HAL_Delay(DEBOUNCE_DELAY_MS);
    }

    while (1)
    {
        currentReading = HAL_GPIO_ReadPin(User_Button_GPIO_Port, User_Button_Pin);
        if (currentReading != lastButtonState)
        {
            HAL_Delay(DEBOUNCE_DELAY_MS);
            currentReading = HAL_GPIO_ReadPin(User_Button_GPIO_Port, User_Button_Pin);
            if (currentReading != lastButtonState)
            {
                if (lastButtonState == GPIO_PIN_SET && currentReading == GPIO_PIN_RESET)
                {
                    direction = !direction;
                }
                lastButtonState = currentReading;
            }
        }

        if ((HAL_GetTick() - previousTick) >= BLINK_DELAY_MS)
        {
            previousTick = HAL_GetTick();
            if (direction == 0) 
            {
                activeLedIndex++;
                if (activeLedIndex > 3) activeLedIndex = 0;
            }
            else 
            {
                if (activeLedIndex == 0) activeLedIndex = 3;
                else activeLedIndex--;
            }
            UpdateLEDs();
        }

        HAL_Delay(10);
    }
}

static void UpdateLEDs(void)
{
    HAL_GPIO_WritePin(LD3_GPIO_Port, LD3_PIN, GPIO_PIN_RESET);
    HAL_GPIO_WritePin(LD4_GPIO_Port, LD4_PIN, GPIO_PIN_RESET);
    HAL_GPIO_WritePin(LD5_GPIO_Port, LD5_PIN, GPIO_PIN_RESET);
    HAL_GPIO_WritePin(LD6_GPIO_Port, LD6_PIN, GPIO_PIN_RESET);
    
    switch (activeLedIndex)
    {
        case 0: HAL_GPIO_WritePin(LD3_GPIO_Port, LD3_PIN, GPIO_PIN_SET); break;
        case 1: HAL_GPIO_WritePin(LD4_GPIO_Port, LD4_PIN, GPIO_PIN_SET); break;
        case 2: HAL_GPIO_WritePin(LD5_GPIO_Port, LD5_PIN, GPIO_PIN_SET); break;
        case 3: HAL_GPIO_WritePin(LD6_GPIO_Port, LD6_PIN, GPIO_PIN_SET); break;
        default: break;
    }
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
    RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    {
        Error_Handler();
    }

    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                  | RCC_CLOCKTYPE_PCLK1;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
    RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV1;

    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
    {
        Error_Handler();
    }
}

/**
  * @brief I2C1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_I2C1_Init(void)
{
    hi2c1.Instance = I2C1;
    hi2c1.Init.Timing = 0x20303E5D;
    hi2c1.Init.OwnAddress1 = 0;
    hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
    hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
    hi2c1.Init.OwnAddress2 = 0;
    hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
    hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
    hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
    if (HAL_I2C_Init(&hi2c1) != HAL_OK)
    {
        Error_Handler();
    }

    if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
    {
        Error_Handler();
    }

    if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
    {
        Error_Handler();
    }
}

/**
  * @brief USART1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART1_UART_Init(void)
{
    huart1.Instance = USART1;
    huart1.Init.BaudRate = 115200;
    huart1.Init.WordLength = UART_WORDLENGTH_8B;
    huart1.Init.StopBits = UART_STOPBITS_1;
    huart1.Init.Parity = UART_PARITY_NONE;
    huart1.Init.Mode = UART_MODE_TX_RX;
    huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    huart1.Init.OverSampling = UART_OVERSAMPLING_16;
    huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
    huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
    huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
    if (HAL_UART_Init(&huart1) != HAL_OK)
    {
        Error_Handler();
    }
    if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
    {
        Error_Handler();
    }
    if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
    {
        Error_Handler();
    }
    if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK)
    {
        Error_Handler();
    }
}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOF_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();

    // Кнопка: вход с подтяжкой вверх
    GPIO_InitStruct.Pin = User_Button_Pin;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    HAL_GPIO_Init(User_Button_GPIO_Port, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7 | GPIO_PIN_8 | GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
    __disable_irq();
    while (1)
    {
    }
}

#ifdef  USE_FULL_ASSERT
void assert_failed(uint8_t *file, uint32_t line)
{
}
#endif /* USE_FULL_ASSERT */