/**
  ******************************************************************************
  * File Name          : main.c
  * Description        : Main program body
  ******************************************************************************
  *
  * COPYRIGHT(c) 2017 STMicroelectronics
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */
/* Includes ------------------------------------------------------------------*/
#include <string.h>
#include <stdlib.h>
#include <math.h>

#include "main.h"
#include "stm32f4xx_hal.h"

/* USER CODE BEGIN Includes */
#include "ssd1306.h"
#include "fonts.h"
//#include "dht22.h"
/* USER CODE END Includes */

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

/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/
char UART1_Data;
char UART_Buffer[32];
char text[32];
int i;

typedef struct {
  float x;
  float y;
  float z;
} triPoint;

triPoint vertices[8];
triPoint lineVertices[8];

uint32_t angleX = 0;
uint32_t angleY = 0;
uint32_t angleZ = 0;

struct _tStar
{
  unsigned char nX;
  unsigned char nY;
  unsigned char nStarType;
};

#define STARS_NUM 80
struct _tStar aStars[STARS_NUM];

/* USER CODE END PV */

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

/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/

/* USER CODE END PFP */

/* USER CODE BEGIN 0 */
triPoint rotateX(triPoint startingPoint, uint16_t angle) {
  triPoint computedPoint;

  float rad = angle * 3.141592 / 180;
  float cosa = cos(rad);
  float sina = sin(rad);
  computedPoint.x = startingPoint.x;
  computedPoint.y = (startingPoint.y * cosa) - (startingPoint.z * sina);
  computedPoint.z = (startingPoint.y * sina) + (startingPoint.z * cosa);
  return computedPoint;
}

triPoint rotateY(triPoint startingPoint, uint16_t angle) {
  triPoint computedPoint;

  float rad = angle * 3.141592 / 180;
  float cosa = cos(rad);
  float sina = sin(rad);
  computedPoint.y = startingPoint.y;
  computedPoint.z = (startingPoint.z * cosa) - (startingPoint.x * sina);
  computedPoint.x = (startingPoint.z * sina) + (startingPoint.x * cosa);
  return computedPoint;
}

triPoint rotateZ(triPoint startingPoint, uint16_t angle) {
  triPoint computedPoint;

  float rad = angle * 3.141592 / 180;
  float cosa = cos(rad);
  float sina = sin(rad);
  computedPoint.z = startingPoint.z;
  computedPoint.x = (startingPoint.x * cosa) - (startingPoint.y * sina);
  computedPoint.y = (startingPoint.x * sina) + (startingPoint.y * cosa);
  return computedPoint;
}

triPoint projectPoint(triPoint startingPoint, uint8_t win_width, uint8_t win_height, uint8_t fov, uint8_t viewer_distance) {
  triPoint returnPoint;
  float factor = fov/(viewer_distance + startingPoint.z);
  returnPoint.x = startingPoint.x * factor + win_width/2;
  returnPoint.y = -startingPoint.y * factor + win_height/2;
  returnPoint.z = 1;
  return returnPoint;
}
/* USER CODE END 0 */

int main(void)
{
  /* USER CODE BEGIN 1 */
  vertices[0].x = -1;
  vertices[0].y = 1;
  vertices[0].z = -1;
  vertices[1].x = 1;
  vertices[1].y = 1;
  vertices[1].z = -1;
  vertices[2].x = 1;
  vertices[2].y = -1;
  vertices[2].z = -1;
  vertices[3].x = -1;
  vertices[3].y = -1;
  vertices[3].z = -1;
  vertices[4].x = -1;
  vertices[4].y = 1;
  vertices[4].z = 1;
  vertices[5].x = 1;
  vertices[5].y = 1;
  vertices[5].z = 1;
  vertices[6].x = 1;
  vertices[6].y = -1;
  vertices[6].z = 1;
  vertices[7].x = -1;
  vertices[7].y = -1;
  vertices[7].z = 1;

  triPoint calcPoint, newPoint;

  unsigned char nStar = 0;
  memset(aStars, 0, sizeof(aStars));

  //Init
  for(nStar = 0; nStar < STARS_NUM; nStar++)
  {
    aStars[nStar].nX = rand() % 128;
    aStars[nStar].nY = rand() % 64;
    aStars[nStar].nStarType = rand() % 3;
  }
  /* USER CODE END 1 */

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

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

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_I2C1_Init();
  MX_USART1_UART_Init();

  /* USER CODE BEGIN 2 */
  ssd1306_Init();
  //DHT22_Init();
  HAL_UART_Receive_IT(&huart1, (uint8_t*) &UART1_Data, 1);

/*
  for(int y = 0; y < 129; y++) {
    ssd1306_DrawPixel(y, 20, White);
  }
*/
  //drawLine(1, 1, 20, 20);
  //ssd1306_UpdateScreen();
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  int zbr = 40;
  int direction = 1;
  while (1)
  {
  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */
    ssd1306_Fill(Black);
    //ssd1306_UpdateScreen();
    /*
    int x, msg;
    HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_6); //Toggle the state of pin PC9
    //DHT22_Read(htim6);
    

    //startscrollright(0x00, 0x0F);

    for(int times = 0; times < 12; times++) {
      ssd1306_Scroll();
      ssd1306_UpdateScreen();
      HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_7); //Toggle the state of pin PC9
    }

    x = rand() % 60 + 1;
    msg = rand() % 2 + 1;
    ssd1306_SetCursor(x, 53);
    ssd1306_WriteString((msg == 1) ? "GORDOS" : "LOL", Font_7x10, White);
*/

    for(nStar = 0; nStar < STARS_NUM; nStar++) {
      //move star
      switch(aStars[nStar].nStarType) {
        case 0: //slow star
          aStars[nStar].nX += 2;
          break;
        case 1: //medium star
          aStars[nStar].nX += 3;
          break;
        case 2: //fast star
          aStars[nStar].nX += 4;
          break;
      }

      if (aStars[nStar].nX >= 160) {
        HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_6); //Toggle the state of pin PC9
        aStars[nStar].nX = 0;
        aStars[nStar].nY = rand() % 200;
        aStars[nStar].nStarType = rand() % 3;
        continue;
      }

      //paint star
      ssd1306_DrawPixel(aStars[nStar].nX, aStars[nStar].nY, White);
    }
/*
    ssd1306_SetCursor(zbr - 39, (sin(zbr) * 10) + 10);
    ssd1306_WriteString("LOLGORDOS", Font_7x10, White);

    //ssd1306_SetCursor(zbr - 39, 53);
    ssd1306_SetCursor(zbr - 39, (sin(zbr) * 10) + 43);
    ssd1306_WriteString("DEMOSCENE", Font_7x10, White);
*/

    if (direction == 1) {
      zbr++;
    } else {
      zbr--;
    }

    for (uint8_t i = 0; i<8; i++) {
      calcPoint = rotateZ(vertices[i],angleZ++);
      calcPoint = rotateY(calcPoint,angleY++);
      calcPoint = rotateX(calcPoint,angleX++);
      newPoint = projectPoint(calcPoint, 128, 64, zbr, 5);
      lineVertices[i] = newPoint;
    }

    drawLine(lineVertices[0].x,lineVertices[0].y,lineVertices[1].x,lineVertices[1].y);
    drawLine(lineVertices[1].x,lineVertices[1].y,lineVertices[2].x,lineVertices[2].y);
    drawLine(lineVertices[2].x,lineVertices[2].y,lineVertices[3].x,lineVertices[3].y);
    drawLine(lineVertices[3].x,lineVertices[3].y,lineVertices[0].x,lineVertices[0].y);
    drawLine(lineVertices[0].x,lineVertices[0].y,lineVertices[4].x,lineVertices[4].y);
    drawLine(lineVertices[1].x,lineVertices[1].y,lineVertices[5].x,lineVertices[5].y);
    drawLine(lineVertices[2].x,lineVertices[2].y,lineVertices[6].x,lineVertices[6].y);
    drawLine(lineVertices[3].x,lineVertices[3].y,lineVertices[7].x,lineVertices[7].y);
    drawLine(lineVertices[4].x,lineVertices[4].y,lineVertices[5].x,lineVertices[5].y);
    drawLine(lineVertices[5].x,lineVertices[5].y,lineVertices[6].x,lineVertices[6].y);
    drawLine(lineVertices[6].x,lineVertices[6].y,lineVertices[7].x,lineVertices[7].y);
    drawLine(lineVertices[7].x,lineVertices[7].y,lineVertices[4].x,lineVertices[4].y);

    ssd1306_UpdateScreen();
    HAL_Delay(25);

    if (zbr > 100) {
      direction = 0;
    }

    if (zbr < 40) {
      direction = 1;
    }
  }
  /* USER CODE END 3 */
}

/** System Clock Configuration
*/
void SystemClock_Config(void)
{

  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;

    /**Configure the main internal regulator output voltage 
    */
  __HAL_RCC_PWR_CLK_ENABLE();

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

    /**Initializes the CPU, AHB and APB busses clocks 
    */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = 16;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

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

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }

    /**Configure the Systick interrupt time 
    */
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

    /**Configure the Systick 
    */
  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

/* I2C1 init function */
static void MX_I2C1_Init(void)
{

  hi2c1.Instance = I2C1;
  hi2c1.Init.ClockSpeed = 400000;
  hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_16_9;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    Error_Handler();
  }

}

/* USART1 init function */
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;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }

}

/** Configure pins as 
        * Analog 
        * Input 
        * Output
        * EVENT_OUT
        * EXTI
*/
static void MX_GPIO_Init(void)
{

  GPIO_InitTypeDef GPIO_InitStruct;

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

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_6|GPIO_PIN_7, GPIO_PIN_RESET);

  /*Configure GPIO pins : PA6 PA7 */
  GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
  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);

}

/* USER CODE BEGIN 4 */
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
  char n = 0;
  char UART_Aux[32];
 
  if (huart->Instance == USART1) {
    if (UART1_Data != '\n') {
      UART_Buffer[i] = UART1_Data;
      i++;
    } else {

      n = sprintf(UART_Aux, "%s\r\n", UART_Buffer);

      HAL_UART_Transmit(&huart1, (uint8_t*) &UART_Aux, n, 1000);


      // limpa o '\r'
      UART_Buffer[i-1] = 0;
      snprintf(text, 32, "%s", UART_Buffer);

      i = 0;
    }
    HAL_UART_Receive_IT(&huart1, (uint8_t*) &UART1_Data, 1);
  }
}
/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler */
  /* User can add his own implementation to report the HAL error return state */
  while(1) 
  {
  }
  /* USER CODE END Error_Handler */ 
}

#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

/**
  * @}
  */ 

/**
  * @}
*/ 

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/