#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <avr/pgmspace.h>

#define OLED_Address 0x3C
Adafruit_SSD1306 display(128, 64);

const unsigned char sample[] PROGMEM = { 126, 126, 126, 126, 126, 126, 126, 126, 127, 128, 128, 129, 129, 129, 129, 128, 128, 128, 128, 128, 128, 128, 129, 128, 128, 128, 128, 128, 127, 126, 127, 127, 126, 127, 127, 127, 127, 128, 127, 127, 127, 128, 128, 127, 128, 127, 128, 127, 128, 128, 128, 127, 127, 127, 127, 128, 128, 128, 127, 128, 128, 128, 129, 129, 128, 128, 129, 128, 128, 127, 128, 127, 127, 127, 127, 127, 126, 126, 126, 126, 126, 126, 126, 126, 126, 127, 128, 128, 128, 128, 128, 127, 127, 127, 127, 128, 128, 128, 128, 128, 128, 128, 127, 126, 127, 126, 126, 126, 126, 126, 126, 127, 128, 128, 127, 129, 128, 128, 129, 128, 128, 129, 128, 128, 129, 127, 128, 128, 128, 128, 129, 129, 129, 129, 129, 128, 127, 128, 127, 128, 127, 128, 128, 128, 127, 126, 126, 126, 126, 126, 127, 127, 128, 128, 128, 129, 130, 129, 128, 129, 129, 128, 128, 128, 127, 128, 128, 126, 127, 128, 127, 129, 128, 128, 128, 128, 126, 126, 126, 127, 127, 127, 128, 127, 128, 128, 128, 128, 128, 127, 127, 129, 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const int sampleLength = sizeof(sample);

volatile int sampleIndex = 0;
volatile int playbackDelayCounter = 0;
volatile int repeatStartIndex = 0;
volatile int repeatLength = 128; // Default repeat length
volatile bool randomPlayback = false; // Random playback mode flag

int playbackDelay = 15;  // Default playback delay
int waveform[128];       // Store last 128 samples for display

const int potPitchPin = A0;   // Pot1: Pitch control
const int potBeatPin = A1;    // Pot2: Beat repeater
const int potRetrigPin = A2;  // Pot3: Retrigger length and randomization

void setupTimer1() {
  pinMode(9, OUTPUT); // Pin D9 for audio output
  TCCR1A = _BV(COM1A1) | _BV(WGM11);  // Non-inverting mode, Fast PWM
  TCCR1B = _BV(WGM13) | _BV(WGM12) | _BV(CS10); // Fast PWM, no prescaling
  ICR1 = 256;  // Set TOP value for 31.25kHz PWM frequency
  OCR1A = 0;   // Initialize output compare register
  TIMSK1 = _BV(OCIE1A); // Enable Timer1 Compare Match A interrupt
}

ISR(TIMER1_COMPA_vect) {
  playbackDelayCounter++;
  if (playbackDelayCounter >= playbackDelay) {
    playbackDelayCounter = 0;

    int sampleValue;
    if (randomPlayback) {
      // Random sample selection within current retrigger length
      sampleValue = pgm_read_byte(&sample[random(repeatStartIndex, repeatStartIndex + repeatLength)]);
    } else {
      // Regular or repeating playback
      sampleValue = pgm_read_byte(&sample[sampleIndex]);
    }

    OCR1A = sampleValue; // Output to speaker
    waveform[sampleIndex % 128] = sampleValue; // Store waveform data

    sampleIndex++;
    if (sampleIndex >= sampleLength) {
      sampleIndex = 0; // Loop back to start of the sample
    }
    if (sampleIndex >= repeatStartIndex + repeatLength) {
      sampleIndex = repeatStartIndex; // Loop within retrigger length
    }
  }
}

void setup() {
  if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_Address)) {
    while (1); // Halt if OLED fails
  }
  display.clearDisplay();
  display.display();

  setupTimer1();
}

void loop() {
  // Potentiometer 1: Pitch control
  int potValue1 = analogRead(potPitchPin);
  playbackDelay = map(potValue1, 0, 1023, 5, 50);

  // Potentiometer 2: Beat repeater activation
  int potValue2 = analogRead(potBeatPin);
  bool beatRepeatActive = (potValue2 > 512); // 50% threshold to activate
  if (beatRepeatActive) {
    repeatStartIndex = sampleIndex; // Update repeat starting point
  }

  // Potentiometer 3: Retrigger length and randomization
  int potValue3 = analogRead(potRetrigPin);
  repeatLength = map(potValue3, 0, 512, 32, 512); // First half of Pot3 controls length
  randomPlayback = (potValue3 > 512);            // Second half of Pot3 enables randomization

  // Update OLED display
  display.clearDisplay();

  // Display waveform in real-time
  for (int i = 0; i < 127; i++) {
    int y1 = map(waveform[i], 0, 255, 50, 10); // Adjust for zoom (50 to 10 is the visible range)
    int y2 = map(waveform[i + 1], 0, 255, 50, 10);
    display.drawLine(i, y1, i + 1, y2, WHITE); // Connect points with a line
  }

  // Show Pot3 mode and values
  display.setCursor(0, 0);
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.print("Retrigger Len: ");
  display.print(repeatLength);
  display.setCursor(0, 10);
  display.print("Random Mode: ");
  display.print(randomPlayback ? "ON" : "OFF");
  display.display();

  delay(10); // Small delay for smoother display updates
}