#include <stdio.h>
#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
#include "DHT.h"

// PUSH BUTTON
#define BUTTON_PIN 4

// DTH222
#define DHTPIN 2     
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

DHT dht(DHTPIN, DHTTYPE);

// set to 1 if we are implementing the user interface pot, switch, etc
#define USE_UI_CONTROL 0

#if USE_UI_CONTROL
#include <MD_UISwitch.h>
#endif

// Turn on debug statements to the serial output
#define DEBUG 0

#if DEBUG
#define PRINT(s, x) { Serial.print(F(s)); Serial.print(x); }
#define PRINTS(x) Serial.print(F(x))
#define PRINTX(x) Serial.println(x, HEX)
#else
#define PRINT(s, x)
#define PRINTS(x)
#define PRINTX(x)
#endif

// 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 MAX_DEVICES 8
#define CLK_PIN   13
#define DATA_PIN  11
#define CS_PIN    10

// HARDWARE SPI
MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
// SOFTWARE SPI
//MD_Parola P = MD_Parola(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);

// Scrolling parameters
#if USE_UI_CONTROL
const uint8_t SPEED_IN = A5;
const uint8_t DIRECTION_SET = 9;  // change the effect
const uint8_t INVERT_SET = 8;     // change the invert

const uint8_t SPEED_DEADBAND = 5;
#endif // USE_UI_CONTROL

uint8_t scrollSpeed = 25;    // default frame delay value
textEffect_t scrollEffect = PA_SCROLL_LEFT;

textPosition_t scrollAlign = PA_LEFT;
uint16_t scrollPause = 1500; // in milliseconds

// Global message buffers shared by Serial and Scrolling functions
#define	BUF_SIZE 100
char curMessage[BUF_SIZE] = { "LED MATRIX DISPLAY"};
char newMessage[BUF_SIZE] = { "BY GERCHE" };


bool newMessageAvailable = false;
String newDisplayText = "Processing";


#if USE_UI_CONTROL

MD_UISwitch_Digital uiDirection(DIRECTION_SET);
MD_UISwitch_Digital uiInvert(INVERT_SET);


void doUI(void)
{
  // set the speed if it has changed
  {
    int16_t speed = map(analogRead(SPEED_IN), 0, 1023, 10, 150);

    if ((speed >= ((int16_t)P.getSpeed() + SPEED_DEADBAND)) ||
      (speed <= ((int16_t)P.getSpeed() - SPEED_DEADBAND)))
    {
      P.setSpeed(speed);
      scrollSpeed = speed;
      PRINT("\nChanged speed to ", P.getSpeed());
    }
  }

  if (uiDirection.read() == MD_UISwitch::KEY_PRESS) // SCROLL DIRECTION
  {
    PRINTS("\nChanging scroll direction");
    scrollEffect = (scrollEffect == PA_SCROLL_LEFT ? PA_SCROLL_RIGHT : PA_SCROLL_LEFT);
    P.setTextEffect(scrollEffect, scrollEffect);
    P.displayClear();
    P.displayReset();
  }

  if (uiInvert.read() == MD_UISwitch::KEY_PRESS)  // INVERT MODE
  {
    PRINTS("\nChanging invert mode");
    P.setInvert(!P.getInvert());
  }
}
#endif // USE_UI_CONTROL

void readSerial(void)
{
  static char *cp = newMessage;

  while (Serial.available())
  {
    *cp = (char)Serial.read();
    if ((*cp == '\n') || (cp - newMessage >= BUF_SIZE-2)) // end of message character or full buffer
    {
      *cp = '\0'; // end the string
      // restart the index for next filling spree and flag we have a message waiting
      cp = newMessage;
      newMessageAvailable = true;
    }
    else  // move char pointer to next position
      cp++;
  }
}

void setup()
{
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  Serial.print("\n[Parola Scrolling Display]\nType a message for the scrolling display\nEnd message line with a newline");

  dht.begin();


#if USE_UI_CONTROL
  uiDirection.begin();
  uiInvert.begin();
  pinMode(SPEED_IN, INPUT);

  doUI();
#endif // USE_UI_CONTROL

  P.begin();
}

int lastState = HIGH;
String humidityLabel = "Humidity: ";
String temperatureLabel = " Temperature ";
String celciusLabel = "°C";
void loop()
{
  int value = digitalRead((BUTTON_PIN));
  if (lastState != value) {
    lastState = value;
    if (value == HIGH) {
      Serial.println("button release");
    }
    if (value == LOW) {
      float temperature = dht.readTemperature();
      float humidity = dht.readHumidity();

      // Check if any reads failed and exit early (to try again).
      if (isnan(temperature) || isnan(humidity)) {
        Serial.println(F("Failed to read from DHT sensor!"));
        return;
      }
    
      String humiditiyDisplay = humidityLabel + humidity;
      String temperatureDisplay = temperatureLabel + temperature + celciusLabel;
      newDisplayText = humiditiyDisplay + temperatureDisplay;
      Serial.println(newDisplayText);

      P.displayReset();
      char buf2[BUF_SIZE];
      newDisplayText.toCharArray(buf2, sizeof(buf2));
      P.displayText(buf2, scrollAlign, scrollSpeed, scrollPause, scrollEffect, scrollEffect);
    }
  }
  #if USE_UI_CONTROL
    doUI();
  #endif // USE_UI_CONTROL
  
  if (P.displayAnimate())
  {
    if (newMessageAvailable)
    {
      strcpy(curMessage, newMessage);
      newMessageAvailable = false;
    }
    P.displayReset();
  }
  readSerial();
}