#include <Wire.h>
#include <MPU6050_tockn.h>
#include <LedControl.h>

MPU6050 mpu(Wire);

// MAX7219: DIN = 11, CLK = 13, CS = 10
LedControl lc = LedControl(11, 13, 10, 2);

const int buzzer = A0;

// 10 minut = 600s = 600000ms
// 64 donaga bo‘lamiz → 9375ms (9.3s) da 1 dona tushadi
unsigned long dropInterval = 9375;
unsigned long lastDrop = 0;

// Qum holati
byte gridTop[8][8];
byte gridBottom[8][8];


void resetSand() {
  for (int y = 0; y < 8; y++) {
    for (int x = 0; x < 8; x++) {
      gridTop[y][x] = 1;      
      gridBottom[y][x] = 0;
    }
  }
  lc.clearDisplay(0);
  lc.clearDisplay(1);
  lastDrop = millis();
}


void drawMatrix() {
  for (int y = 0; y < 8; y++)
    for (int x = 0; x < 8; x++)
      lc.setLed(0, y, x, gridTop[y][x]);

  for (int y = 0; y < 8; y++)
    for (int x = 0; x < 8; x++)
      lc.setLed(1, y, x, gridBottom[y][x]);
}


// Bitta qum hujayrasi pastga tushadi
void dropSand() {
  for (int y = 7; y >= 0; y--) {
    for (int x = 0; x < 8; x++) {
      if (gridTop[y][x] == 1) {

        gridTop[y][x] = 0;
        gridBottom[0][x] = 1;

        tone(buzzer, 600, 40);
        return;
      }
    }
  }
}


// Pastdagi qumni joylashtirish
void settleBottom() {
  for (int y = 6; y >= 0; y--) {
    for (int x = 0; x < 8; x++) {
      if (gridBottom[y][x] == 1 && gridBottom[y + 1][x] == 0) {
        gridBottom[y][x] = 0;
        gridBottom[y + 1][x] = 1;
      }
    }
  }
}


// MPU orientatsiya aniqlash (Y o‘qi bo‘yicha)
bool isUpsideDown() {
  int angleY = mpu.getAngleY();
  return angleY > 50;   // teskari bo‘lsa TRUE
}


void setup() {
  Wire.begin();
  mpu.begin();
  mpu.calcGyroOffsets(true);

  lc.shutdown(0, false);
  lc.shutdown(1, false);
  lc.setIntensity(0, 5);
  lc.setIntensity(1, 5);

  pinMode(buzzer, OUTPUT);

  resetSand();
  drawMatrix();
}


void loop() {
  mpu.update();

  if (!isUpsideDown()) {
    // Qum pastga oqadi

    if (millis() - lastDrop >= dropInterval) {
      dropSand();
      lastDrop = millis();
    }

    settleBottom();
    drawMatrix();
  }

  else {
    // Teskari aylantirilsa → qayta to‘ladi
    resetSand();
    drawMatrix();
    tone(buzzer, 450, 200);
    delay(1200);
  }

  delay(100);
}