/*
 * Use of MAX72XX, DS1307 and DTH22 components to 
 * print some information on the display.
 *
 * for more examples:
 * https://github.com/MajicDesigns/MD_Parola/tree/main/examples
 * https://github.com/MajicDesigns/MD_MAX72XX/tree/main/examples
 */

// Header file includes
#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <DHT.h>
#include <SPI.h>
#include <Wire.h>
#include "Font7Seg.h"

// Define the number of devices we have in the chain and the hardware interface
// NOTE: These pin numbers will probably not work with your hardware and may
// need to be adapted
#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW
//#define HARDWARE_TYPE MD_MAX72XX::FC16_HW alterar na IDE do arduino
#define MAX_DEVICES 4 // Define the number of displays connected
#define CLK_PIN    23 // CLK or SCK
#define DATA_PIN   19 // DATA or MOSI
#define CS_PIN     22 // CS or SS
#define SPEED_TIME 75 // Speed of the transition
#define PAUSE_TIME  0
#define MAX_MESG   20


// These are for the temperature
#define DHTPIN 2
#define DHTTYPE DHT22
#define TIMEDHT 1000


char szTime[9];    // mm:ss\0
char szMesg[MAX_MESG + 1] = "";

float humidity, celsius, fahrenheit;
char buffer[20]; // Make sure the buffer is large enough

uint8_t degC[] = { 6, 3, 3, 56, 68, 68, 68 }; // Deg C
uint8_t degF[] = { 6, 3, 3, 124, 20, 20, 4 }; // Deg F

uint8_t clear = 0x00;

uint32_t timerDHT = TIMEDHT;

DHT dht(DHTPIN, DHTTYPE);

// Hardware SPI connection
MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);

// Code for get Temperature
void getTemperature()
{
  // Wait for a time between measurements
  if ((millis() - timerDHT) > TIMEDHT) {
    // Update the timer
    timerDHT = millis();

    // Reading temperature or humidity takes about 250 milliseconds!
    // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
    humidity = dht.readHumidity();

    // Read temperature as Celsius (the default)
    celsius = dht.readTemperature();

    // Read temperature as Fahrenheit (isFahrenheit = true)
    fahrenheit = dht.readTemperature(true);

    // Check if any reads failed and exit early (to try again)
    if (isnan(humidity) || isnan(celsius) || isnan(fahrenheit)) {
      Serial.println("Failed to read from DHT sensor!");
      return;
    }
  }
}

void setup(void)
{
  Serial.begin(115200);
  Serial.println(F("DHTxx test!"));
  Wire.begin();

  P.begin();

  dht.begin();
  floatToASCII(celsius, buffer, 2);
}

void loop(void)
{
 
 Serial.print (celsius);

  getTemperature();

  P.displayAnimate();
 delay(2000);

  P.print(buffer);
 
}

void floatToASCII(float num, char *buffer, int precision)
{
  // Handle the case where the number is negative
  if (num < 0) 
  {
    *buffer++ = '-';
    num = -num;
  }

  // Extract the integer and fractional parts
  int intPart = (int)num;
  float fracPart = num - (float)intPart;

  // Convert the integer part to ASCII
  int length = snprintf(buffer, 10, "%d", intPart);
  buffer += length;

  // Add the decimal point
  *buffer++ = '.';

  // Convert the fractional part to ASCII with the specified precision
  for (int i = 0; i < precision; i++) 
  {
    fracPart *= 10;
    int digit = (int)fracPart;
    *buffer++ = '0' + digit;
    fracPart -= digit;
  }

  // Null-terminate the string
  *buffer = '\0';
}