// --------------------------- INCLUDE LIB --------------------------- //
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
//#include <TaskScheduler.h>  //non utilizzato per il momento

// --------------------------- ADAFRUIT DEFINE --------------------------- //
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library.
// On an arduino UNO:       A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
// On an arduino LEONARDO:   2(SDA),  3(SCL), ...

#define SCREEN_WIDTH 128     // OLED display width, in pixels
#define SCREEN_HEIGHT 64     // OLED display height, in pixels
#define OLED_RESET -1        // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C  ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
#define LOGO_HEIGHT 16
#define LOGO_WIDTH 16
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
// ---------------------------   --------------------------- //

const int LedPin = 13;  // Internal LED connected to digital pin 13
int LedVal = 0;

const int ButtonPin = 9;  // pushbutton connected to digital pin x
int ButtonVal = 0;        // variable to store the read value

const int PotPin = A1;  // pushbutton connected to digital pin 7
int PotVal = 0;         // variable to store the read value
int PotValPerc = 0;     // variable to store the read value
int PotValPercLog = 0;

const int ButtonPagePin = 2;  // pushbutton connected to digital pin x
int8_t ButtonPageVal = 0;        // variable to store the read value
int8_t ButtonPageVal_old = 0;
int8_t ButtonPageVal_Deb1 = 0;
int8_t ButtonPageVal_Deb1_old = 0;
int8_t ButtonPageVal_Deb2 = 0;
int8_t ButtonPageVal_Deb2_old = 0;
int ButtonPage_DebDelay1 = 400;  // the debounce time; increase if the output flickers
int ButtonPage_DebDelay2 = 30;   // the debounce time; increase if the output flickers

int PageNumb1 = 0;  // Page per pressione lunga
int PageNumb2 = 0;  // Page per pressione corta

unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long _t10msL = 0;           // Last x cycles call
unsigned long _t250msL = 0;          // Last x cycles call

const int DispUpdateFreq = 15;  // Frequenza aggiornamento display [ms] (15ms = 66Hz)
const int LogSize = 30;
const int LogScale = 4;         // Fare in modo da avere LogSize*LogScale = 100 circa. (Numero pixel su asse x)
const int LogTInterval = 5000;  //Tempo totale del log [ms]
int LogCycleTime = LogTInterval/(LogSize); // Calcolo Tempo di campionamento in modo da avere il LogTInterval desiderato

int8_t LogValue[(LogSize)] = { 0 };
int LogValue_a = 0;             // indice a per ciclo for
int LogValue_t = 0;

// Altezza log 50 pixel
const int LogXpos = 5;   // Posizione orizzontale per inizio del Log. Il log si svilupperà poi per xx pixel verso il destra
const int LogYpos = 58;  // Posizione verticale   per inizio del Log. Il log si svilupperà poi per 50 pixel verso l'alto. (0 indica l'angolo in alto a sx del display)

// --------------------------- LOGO BABY YODA --------------------------- //
const unsigned char BabyYoda_logo[] PROGMEM = {
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};

// --------------------------- LOGO ARDUINO --------------------------- //
// 'arduino logo', 127x63px
const unsigned char arduino_logo[] PROGMEM = {
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  0x00, 0x00, 0x00, 0x00, 0x3f, 0xc0, 0x00, 0x1f, 0xf0, 0x00, 0x07, 0xf8, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x3f, 0xf0, 0x00, 0x7f, 0xfc, 0x00, 0x1f, 0xf8, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x1f, 0xfc, 0x01, 0xff, 0xff, 0x00, 0x7f, 0xf0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x07, 0xff, 0xff, 0xff, 0xff, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xff, 0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xff, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};


void setup() {
  Serial.begin(9600);  // opens serial port, sets data rate to 9600 bps
  unsigned long start = millis();

  // --------------------------- DISPLAY INITIALIZATION --------------------------- //
  display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);

  // Display the splash screen (we're legally required to do so)
  // Show initial display buffer contents on the screen --
  // the library initializes this with an Adafruit splash screen.
  display.display();
  delay(1500);  // Pause for 2 seconds

  // Clear the buffer
  display.clearDisplay();

  // --------------------------- Arduino Logo --------------------------- //
  display.drawBitmap(0, 0, arduino_logo, 127, 63, WHITE);
  display.display();
  delay(1500);
  display.clearDisplay();

  // --------------------------- Baby Yoda Logo --------------------------- //
  display.drawBitmap(0, 0, BabyYoda_logo, 128, 64, WHITE);
  display.display();
  delay(300);
  display.startscrollright(0x00, 0x0F);
  delay(1000);
  display.stopscroll();
  delay(1000);

  display.clearDisplay();
  display.drawBitmap(28, 0, BabyYoda_logo, 128, 64, WHITE);
  display.setTextSize(0);
  display.setTextColor(WHITE);
  display.setCursor(1, 55);
  display.print("May the 4th be with u");
  display.display();
  delay(3000);
  display.clearDisplay();

  // --------------------------- PIN INITIALIZATION --------------------------- //
  pinMode(LedPin, OUTPUT);               // sets the digital pin 13 as output
  pinMode(ButtonPin, INPUT_PULLUP);      // sets the digital pin 7 as input
  pinMode(ButtonPagePin, INPUT_PULLUP);  // sets the digital pin 7 as input
  pinMode(PotPin, INPUT);
}

void loop() {
  LedVal = digitalRead(LedPin);                // read the input pin
  ButtonVal = digitalRead(ButtonPin);          // read the input pin
  ButtonPageVal = digitalRead(ButtonPagePin);  // read the input pin
  PotVal = analogRead(PotPin);                 // read the input pin
  PotValPerc = map(PotVal, 0, 1023, 0, 100);
  PotValPercLog = map(PotVal, 0, 1023, 0, 50);


  //String Stringa1 = "Pot Value: " + String(PotVal);
  //String Stringa2 = "Button Value: " + String(ButtonVal);
  //String Stringa1n = "Pot Value: " + String(PotValPerc);
  //String Stringa3 = "ButtonPage Value: " + String(ButtonPageVal);
  //Serial.println(Stringa1 + " " + Stringa2 + " " + Stringa3);


  if (ButtonVal == LOW || PotVal >= 500) {
    digitalWrite(LedPin, 1);  // sets the LED to the button's value
  } else {
    digitalWrite(LedPin, 0);  // sets the LED to the button's value
  }

  // --------------------------- DEBOUNCE --------------------------- //
  // DEBOUNCE solo in attivazione e disattivazione oppure solo in attivazione con disattivazione immediata
  // If the switch changed, due to noise or pressing:

  // DEBOUNCE PER BUTTON PAGE 1 (con debounce lungo)
  // - Debouncing usato in attivazione e disattivazione
  //if (ButtonPageVal != ButtonPageVal_old) {           
  if (ButtonPageVal == 0 && ButtonPageVal_old == 1) {  // Debouncing usato solo in attivazione
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > ButtonPage_DebDelay1) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (ButtonPageVal != ButtonPageVal_Deb1) {
      ButtonPageVal_Deb1 = ButtonPageVal;
    }
  }

  // DEBOUNCE PER BUTTON PAGE 2 (con debounce breve)
  //if (ButtonPageVal != ButtonPageVal_old) {           // Debouncing usato in attivazione e disattivazione
  if (ButtonPageVal == 0 && ButtonPageVal_old == 1) {  // Debouncing usato solo in attivazione
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > ButtonPage_DebDelay2) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (ButtonPageVal != ButtonPageVal_Deb2) {
      ButtonPageVal_Deb2 = ButtonPageVal;
    }
  }
  ButtonPageVal_old = ButtonPageVal;

  // --------------------------- CONTATORE PAGINA --------------------------- //
  if (ButtonPageVal_Deb1 == 0 && ButtonPageVal_Deb1_old == 1) {
    PageNumb1 = PageNumb1 + 1;
    if (PageNumb1 >= 2) {
      PageNumb1 = 0;
    }
  }

  //if (ButtonPageVal_Deb2 == 0 && ButtonPageVal_Deb2_old == 1){                               // Calcolo pagina classico sul secondo debounce
  if (ButtonPageVal_Deb2 == 1 && ButtonPageVal_Deb2_old == 0 && ButtonPageVal_Deb1_old == 1) {  // Faccio scattare la pagina 2 solo se ho rilasciato il tasto prima del debounce della pagina 1
    PageNumb2 = PageNumb2 + 1;
    if (PageNumb2 >= 3) {
      PageNumb2 = 0;
    }
  }

  // Aggiorno Variabili _old
  ButtonPageVal_Deb1_old = ButtonPageVal_Deb1;
  ButtonPageVal_Deb2_old = ButtonPageVal_Deb2;

  //Serial.println(String(ButtonPageVal_Deb1) + " " + String(ButtonPageVal_Deb2) + " " + String(PageNumb1) + " " + String(PageNumb2));

  // --------------------------- DEFINIZIONE PAGINE --------------------------- //
  // --------------------------- PAGINA 1
  if (PageNumb2 == 0) {
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);

    // Display static text
    display.setCursor(10, 5);
    display.print("Pot Value: " + String(PotValPerc));
    display.setCursor(95, 5);
    display.print("[Prc]");

    display.drawLine(0, 15, 127, 15, WHITE);

    display.setCursor(10, 20);
    display.print("Button Value: " + String(ButtonVal));
    display.setCursor(10, 32);
    display.print("ButtonPage Value: " + String(ButtonPageVal));

    // Barra variabile
    display.drawLine(110, 48, 110, 52, WHITE);
    display.drawLine(10, 48, 10, 52, WHITE);
    display.drawLine(60, 48, 60, 52, WHITE);
    display.drawLine(10, 49, 10 + PotValPerc, 49, WHITE);
    display.drawLine(10, 50, 10 + PotValPerc, 50, WHITE);
    display.drawLine(10, 51, 10 + PotValPerc, 51, WHITE);

    // Rettangolo contorno schermo
    display.drawRect(0, 0, 128, 64, WHITE);
  }

  // --------------------------- PAGINA 2
  if (PageNumb2 == 1) {
    display.clearDisplay();
    display.setTextSize(2);
    display.setTextColor(WHITE);

    // Display static text
    display.setCursor(10, 5);
    display.print("LedState:");
    display.setCursor(62, 30);
    display.print(String(LedVal));


    display.drawRect(0, 0, 128, 64, WHITE);
  }

  // --------------------------- PAGINA 3
  if (PageNumb2 == 2) {
    // --------------------------- PAGINA 3.0
    if (PageNumb1 == 0) {
      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);

      display.setCursor(2, 0);
      display.print("100");
      display.setCursor(100, 0);
      display.print(String(PotValPerc) + "%");
      display.setCursor(100, 10);
      display.print("Led" + String(LedVal));

      for (int LogValue_t = 0; LogValue_t <= LogSize - 2; LogValue_t++) {
        // - Stampo solo il pixel i
        //display.drawPixel((LogValue_t * LogScale) + LogXpos, -(LogValue[LogValue_t]) + LogYpos, WHITE);

        // - Interpolazione lineare del plot. Tempo scalato x3. Sostituire tutti LogScale della formula per riscalare
        display.drawLine((LogValue_t * LogScale) + LogXpos, -(LogValue[LogValue_t]) + LogYpos, (LogValue_t * LogScale) + LogScale + LogXpos, -(LogValue[LogValue_t + 1]) + LogYpos, WHITE);
      }

      // Assi
      display.drawLine(0, 0, 0, 63, WHITE);  // Asse y
      //  display.drawLine(0, 63, 127,   63, WHITE);        // Asse x

      // Linee riferimento assi
      display.drawLine(0, LogYpos, 3, LogYpos, WHITE);
      display.drawLine(0, LogYpos - 50, 3, LogYpos - 50, WHITE);

      // Linee tratteggiate Assi
      for (int i = 0; i <= 128; i = i + 4) {
        display.drawPixel(i, LogYpos - 13 - 12 - 12 - 13, WHITE);  // Tratteggio 100%
      }
      for (int i = 0; i <= 128; i = i + 4) {
        display.drawPixel(i, LogYpos - 13 - 12 - 12, WHITE);  // Tratteggio 75%
      }
      for (int i = 0; i <= 128; i = i + 4) {
        display.drawPixel(i, LogYpos - 13 - 12, WHITE);  // Tratteggio 50%
      }
      for (int i = 0; i <= 128; i = i + 4) {
        display.drawPixel(i, LogYpos - 13, WHITE);  // Tratteggio 25%
      }
      for (int i = 0; i <= 128; i = i + 4) {
        display.drawPixel(i, LogYpos, WHITE);  // Tratteggio 0%
      }
    }

    // --------------------------- PAGINA 3.1
    if (PageNumb1 == 1) {
      display.clearDisplay();
      display.setTextSize(1);
      display.setTextColor(WHITE);

      display.setCursor(3, 0);
      display.print("50");
      display.setCursor(100, 0);
      display.print(String(PotValPerc) + "%");
      display.setCursor(100, 10);
      display.print("Led" + String(LedVal));

      for (int LogValue_t = 0; LogValue_t <= LogSize - 2; LogValue_t++) {
        // - Stampo solo il pixel i
        //display.drawPixel((LogValue_t * LogScale) + LogXpos, -(LogValue[LogValue_t]) + LogYpos, WHITE);

        // - Interpolazione lineare del plot. Tempo scalato x3. Sostituire tutti LogScale della formula per riscalare
        display.drawLine((LogValue_t * LogScale) + LogXpos, -(LogValue[LogValue_t] * 2) + LogYpos, (LogValue_t * LogScale) + LogScale + LogXpos, -(LogValue[LogValue_t + 1] * 2) + LogYpos, WHITE);
      }

      // Assi
      display.drawLine(0, 0, 0, 63, WHITE);  // Asse y
      //  display.drawLine(0, 63, 127,   63, WHITE);        // Asse x

      // Linee riferimento assi
      display.drawLine(0, LogYpos, 3, LogYpos, WHITE);
      display.drawLine(0, LogYpos - 50, 3, LogYpos - 50, WHITE);

      // Linee tratteggiate Assi
      for (int i = 0; i <= 128; i = i + 4) {
        display.drawPixel(i, LogYpos - 13 - 12 - 12 - 13, WHITE);  // Tratteggio 100%
      }
      //for (int i = 0; i <= 128; i=i+4) {
      //  display.drawPixel(i, LogYpos-13-12-12, WHITE);   // Tratteggio 75%
      //}
      for (int i = 0; i <= 128; i = i + 4) {
        display.drawPixel(i, LogYpos - 13 - 12, WHITE);  // Tratteggio 50%
      }
      //for (int i = 0; i <= 128; i=i+4) {
      //  display.drawPixel(i, LogYpos-13, WHITE);   // Tratteggio 25%
      //}
      for (int i = 0; i <= 128; i = i + 4) {
        display.drawPixel(i, LogYpos, WHITE);  // Tratteggio 0%
      }
    }
  }

  // --------------------------- AGGIORNO VARIABILE LOG --------------------------- //
  // 250ms System calls
  // Creo il vettore con gli elementi del Log:
  // - LogValue[0] è la più vecchia, LogValue [finale] del vettore la più recente
  //   In questo modo a desta abbiamo il valore più recente
  /*if (millis() - _t250msL >= LogCycleTime) {

    if (LogValue_a > (LogSize - 1)) {
      LogValue_a = 0;
    }
    for (int i = 0; i <= (LogSize - 2); i++) {
      LogValue[i] = LogValue[i + 1];
    }
    LogValue[(LogSize - 1)] = PotValPercLog;

    //Serial.println( String(LogValue_a) );
    //Serial.println( String(LogValue[LogValue_a]) );

    LogValue_a = LogValue_a + 1;
    _t250msL = millis();
  }
  */

  // - LogValue[0] è la più recente, LogValue [finale] del vettore la più vecchia
  //   In questo modo a sinistra abbiamo il valore più recente
  if (millis() - _t250msL >= LogCycleTime) {

    if (LogValue_a > (LogSize - 1)) {
      LogValue_a = 0;
    }
    for (int i = 0; i <= (LogSize - 2); i++) {
      LogValue[(LogSize - 1) - i] = LogValue[(LogSize - 1) - i - 1];
    }
    LogValue[0] = PotValPercLog;

    //Serial.println( String(LogValue_a) );
    //Serial.println( String(LogValue[LogValue_a]) );

    LogValue_a = LogValue_a + 1;
    _t250msL = millis();
  }



  // --------------------------- AGGIORNO DISPLAY --------------------------- //
  // 10ms System calls
  if (millis() - _t10msL >= DispUpdateFreq) {
    DispUpdate();

    _t10msL = millis();
  }
}

// ------- FUNCTION ------- //

void DispUpdate() {
  display.display();
}