/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2026 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file was not provided, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usart.h"
#include "usb_device.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "usbd_cdc_if.h"
#include "stdio.h"
#include "string.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */
uint8_t uart_rx_byte;
uint8_t uart_rx_buf[16];
uint8_t uart_rx_idx = 0;

uint8_t usb_rx_buf[32];
uint8_t usb_rx_idx = 0;

volatile uint8_t ok_received = 0;
volatile uint8_t blive_received = 0;
volatile uint8_t start_received = 0;
volatile uint8_t use_usb = 0;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

static void send_str(const char *str)
{
  if (use_usb)
  {
    uint16_t len = (uint16_t)strlen(str);
    uint8_t retry = 0;
    while (retry < 10)
    {
      if (CDC_Transmit_FS((uint8_t *)str, len) == USBD_OK)
        return;
      HAL_Delay(1);
      retry++;
    }
  }
  else
  {
    printf("%s", str);
  }
}

static void usb_poll_rx(void)
{
  if (usb_app_rx_len == 0)
    return;

  __disable_irq();
  uint16_t len = usb_app_rx_len;
  uint8_t buf[64];
  memcpy(buf, (const void *)usb_app_rx_buf, len);
  usb_app_rx_len = 0;
  __enable_irq();

  for (uint16_t i = 0; i < len; i++)
  {
    uint8_t byte = buf[i];
    if (byte == '\r' || byte == '\n')
    {
      usb_rx_buf[usb_rx_idx] = '\0';
      if (strcmp((char *)usb_rx_buf, "ok") == 0)
      {
        ok_received = 1;
      }
      else if (strcmp((char *)usb_rx_buf, "blive") == 0)
      {
        blive_received = 1;
      }
      else if (strcmp((char *)usb_rx_buf, "start") == 0)
      {
        if (!start_received)
        {
          start_received = 1;
          use_usb = 1;
        }
      }
      usb_rx_idx = 0;
    }
    else
    {
      if (usb_rx_idx < sizeof(usb_rx_buf) - 1)
      {
        usb_rx_buf[usb_rx_idx++] = byte;
      }
      else
      {
        usb_rx_idx = 0;
      }
    }
  }
}

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USB_DEVICE_Init();
  MX_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
  HAL_UART_Receive_IT(&huart1, &uart_rx_byte, 1);

  /* Wait for "start" via either UART or USB CDC */
  while (!start_received)
  {
    usb_poll_rx();
  }
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  uint8_t lost_count = 0;
  while (1)
  {
    uint8_t state = HAL_GPIO_ReadPin(Main12V_In_GPIO_Port, Main12V_In_Pin);
    if (state) {
      lost_count++;
      if (lost_count >= 10) {
        break;
      }
    } else {
      lost_count = 0;
      blive_received = 0;
      send_str("Alive\r\n");
      HAL_GPIO_TogglePin(RUN_GPIO_Port,RUN_Pin);
      uint32_t tick_start = HAL_GetTick();
      while (!blive_received && (HAL_GetTick() - tick_start < 5000)) {
        usb_poll_rx();
      }
      if (!blive_received) {
        break;
      }
    }
    HAL_Delay(10);
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  HAL_GPIO_WritePin(RUN_GPIO_Port,RUN_Pin,GPIO_PIN_SET);
  HAL_GPIO_WritePin(SHUT_GPIO_Port,SHUT_Pin,GPIO_PIN_RESET);
  send_str("SHUTDOWN\r\n");
  uint32_t tick_start = HAL_GetTick();
  
  while (!ok_received && (HAL_GetTick() - tick_start < 60000))
  {
    usb_poll_rx();
  }
  HAL_Delay(10000);
  HAL_GPIO_WritePin(Relay_out_GPIO_Port,Relay_out_Pin,GPIO_PIN_SET);
  /* USER CODE END 3 */
}

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

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLL_DIV1_5;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }
}

/* USER CODE BEGIN 4 */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
  if (huart->Instance == USART1)
  {
    if (uart_rx_byte == '\r' || uart_rx_byte == '\n')
    {
      uart_rx_buf[uart_rx_idx] = '\0';
      if (strcmp((char *)uart_rx_buf, "ok") == 0)
      {
        ok_received = 1;
      }
      else if (strcmp((char *)uart_rx_buf, "blive") == 0)
      {
        blive_received = 1;
      }
      else if (strcmp((char *)uart_rx_buf, "start") == 0)
      {
        if (!start_received)
        {
          start_received = 1;
          use_usb = 0;
        }
      }
      else {
        blive_received = 1;
      }
      uart_rx_idx = 0;
    }
    else
    {
      if (uart_rx_idx < sizeof(uart_rx_buf) - 1)
      {
        uart_rx_buf[uart_rx_idx] = uart_rx_byte;
		uart_rx_idx++;
      }
      else
      {
        uart_rx_idx = 0;
      }
    }
    HAL_UART_Receive_IT(&huart1, &uart_rx_byte, 1);
  }
}

void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart)
{
  if (huart->Instance == USART1)
  {
    __HAL_UART_CLEAR_OREFLAG(huart);
    huart->RxState = HAL_UART_STATE_READY;
    uart_rx_idx = 0;
    HAL_UART_Receive_IT(&huart1, &uart_rx_byte, 1);
  }
}
/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and the number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */