/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2023 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 comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */

#include "stm32c0xx_hal.h"
#include <math.h>

// ADC_HandleTypeDef hadc1;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
// static void MX_USART2_UART_Init(void);
// static void MX_ADC1_Init(void);

int8_t getNumber(uint16_t gpioState) {
  const uint16_t pressedButton = gpioState & 0x03FF;
  switch (pressedButton) {
    case 0x0001:
      return 0;
    case 0x0002:
      return 1;
    case 0x0004:
      return 2;
    case 0x0008:
      return 3;
    case 0x0010:
      return 4;
    case 0x0020:
      return 5;
    case 0x0040:
      return 6;
    case 0x0080:
      return 7;
    case 0x0100:
      return 8;
    case 0x0200:
      return 9;
    default:
      return -1;
  }
}

void Set_Relay1(uint8_t val)
{
  if(val) {
		HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_SET);
	} else {
		HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0, GPIO_PIN_RESET);
	}
}

void Set_Relay2(uint8_t val)
{
  if(val) {
		HAL_GPIO_WritePin(GPIOB, GPIO_PIN_1, GPIO_PIN_SET);
	} else {
		HAL_GPIO_WritePin(GPIOB, GPIO_PIN_1, GPIO_PIN_RESET);
	}
}

typedef enum {
  start = 0,
  locked,
  incorrect,
  unlocked
} state;

int main(void)
{
  HAL_Init();

  SystemClock_Config();
  MX_GPIO_Init();
  // MX_USART2_UART_Init();

  state next_state = start;
  const uint16_t pin = 2482;
  uint16_t pin_input = 0;
  uint8_t exponential = 3;
  while (1)
  {
    switch (next_state) {
      case start:
        Set_Relay1(1);
        Set_Relay2(1);
        next_state = locked;
        HAL_Delay(100);
        break;

      case locked:
        Set_Relay1(0);
        Set_Relay2(0);
        int8_t input = getNumber(GPIOA->ODR);
        if (input != -1) {
          pin_input += input * pow(10, exponential--);
          if (exponential == -1) {
            if (pin_input == pin) next_state = unlocked;
            else next_state = incorrect;
          }
        }
        HAL_Delay(100);
        break;

      case incorrect:
        Set_Relay2(1);
        exponential = 3;
        pin_input = 0;
        next_state = locked;
        HAL_Delay(100);
        break;

      case unlocked:
        Set_Relay1(1);
        break;

      default:
        HAL_Delay(500);
        break;
    }
  }
}

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

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  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();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  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 ADC1 Initialization Function
  * @param None
  * @retval None
  */
// static void MX_ADC1_Init(void)
// {
//   ADC_ChannelConfTypeDef sConfig = {0};

//   hadc1.Instance = ADC1;
//   hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
//   hadc1.Init.Resolution = ADC_RESOLUTION_12B;
//   hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
//   hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
//   hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
//   hadc1.Init.LowPowerAutoWait = DISABLE;
//   hadc1.Init.LowPowerAutoPowerOff = DISABLE;
//   hadc1.Init.ContinuousConvMode = DISABLE;
//   hadc1.Init.NbrOfConversion = 1;
//   hadc1.Init.DiscontinuousConvMode = DISABLE;
//   hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
//   hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
//   hadc1.Init.DMAContinuousRequests = DISABLE;
//   hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
//   hadc1.Init.SamplingTimeCommon1 = ADC_SAMPLETIME_1CYCLE_5;
//   hadc1.Init.SamplingTimeCommon2 = ADC_SAMPLETIME_1CYCLE_5;
//   hadc1.Init.OversamplingMode = DISABLE;
//   hadc1.Init.TriggerFrequencyMode = ADC_TRIGGER_FREQ_HIGH;
//   if (HAL_ADC_Init(&hadc1) != HAL_OK)
//   {
//     Error_Handler();
//   }

//   /** Configure Regular Channel
//   */
//   sConfig.Channel = ADC_CHANNEL_7;
//   sConfig.Rank = ADC_REGULAR_RANK_1;
//   sConfig.SamplingTime = ADC_SAMPLINGTIME_COMMON_1;
//   if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
//   {
//     Error_Handler();
//   }
// }

/**
  * @brief USART2 Initialization Function
  * @param None
  * @retval None
  */
// static void MX_USART2_UART_Init(void)
// {

//   GPIO_InitTypeDef GPIO_InitStruct = {0};
//   __HAL_RCC_USART2_CLK_ENABLE();

//   __HAL_RCC_GPIOA_CLK_ENABLE();
//   /**USART2 GPIO Configuration
//   PA2     ------> USART2_TX
//   PA3     ------> USART2_RX
//   */
//   GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
//   GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
//   GPIO_InitStruct.Pull = GPIO_NOPULL;
//   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
//   GPIO_InitStruct.Alternate = GPIO_AF1_USART2;
//   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

//   huart2.Instance = USART2;
//   huart2.Init.BaudRate = 115200;
//   huart2.Init.WordLength = UART_WORDLENGTH_8B;
//   huart2.Init.StopBits = UART_STOPBITS_1;
//   huart2.Init.Parity = UART_PARITY_NONE;
//   huart2.Init.Mode = UART_MODE_TX_RX;
//   huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
//   huart2.Init.OverSampling = UART_OVERSAMPLING_16;
//   huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
//   huart2.Init.ClockPrescaler = UART_PRESCALER_DIV1;
//   huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
//   if (HAL_UART_Init(&huart2) != HAL_OK)
//   {
//     Error_Handler();
//   }
// }

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0|GPIO_PIN_1, GPIO_PIN_SET);

  /*Configure GPIO pins : PA0 PA1 PA2 PA3
                           PA4 PA5 PA6 PA7
                           PA8 PA9 */
  GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3
                          |GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7
                          |GPIO_PIN_8|GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLDOWN;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : PB0 PB1 */
  GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}

void Error_Handler(void)
{
  __disable_irq();
  while (1)
  {
  }
}

#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 source 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 line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

#define STDOUT_FILENO   1
#define STDERR_FILENO   2

// int _write(int file, uint8_t *ptr, int len)
// {
//   switch (file)
//   {
//     case STDOUT_FILENO:
//       HAL_UART_Transmit(&huart2, ptr, len, HAL_MAX_DELAY);
//       break;

//     case STDERR_FILENO:
//       HAL_UART_Transmit(&huart2, ptr, len, HAL_MAX_DELAY);
//       break;

//     default:
//       return -1;
//   }

//   return len;
// }