#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

// -- tvoje custom znaky --
byte bar0[8] = {
  B11111,
  B10000,
  B10000,
  B10000,
  B10000,
  B10000,
  B10000,
  B11111
};

byte bar1[8] = {
  B11111,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B11111
};

byte bar2[8] = {
  B11111,
  B00001,
  B00001,
  B00001,
  B00001,
  B00001,
  B00001,
  B11111
};

byte b2[8] = {
  B11111,
  B11000,
  B11000,
  B11000,
  B11000,
  B11000,
  B11000,
  B11111
};
byte b3[8] = {
  B11111,
  B11100,
  B11100,
  B11100,
  B11100,
  B11100,
  B11100,
  B11111
};
byte b4[8] = {
  B11111,
  B11110,
  B11110,
  B11110,
  B11110,
  B11110,
  B11110,
  B11111
};





void setup() {
  lcd.begin(16, 2);
  lcd.backlight();

  lcd.createChar(0, bar0);
  lcd.createChar(1, bar1);
  lcd.createChar(2, bar2);
  lcd.createChar(3, b2);
  lcd.createChar(4, b3);
  lcd.createChar(5, b4);
 
}

void loop() {

  for (int i=0 ; i<100; i+=random(1,5)){
    drawProgress(i);
    delay(random(500,1000));
  }

  delay(2000);
  lcd.clear();
}

// --------------------------------------------------

void drawProgress(int p) {
  if (p < 0) p = 0;
  if (p > 100) p = 100;

  // 10 buněk, ale výplň má 5 úrovní
  // 1 buňka = 10 %
  // 1 krok uvnitř buňky = 10% / 5 = 2%
  int totalSteps = (p * 5) / 10;   // rozsah 0–50
  int fullCells  = totalSteps / 5; // kolik buněk je plně
  int partial    = totalSteps % 5; // úroveň výplně 0–4

  lcd.setCursor(0, 0);

  for (int pos = 0; pos < 10; pos++) {

    // --- RÁM ---
    if (pos == 0) {
      lcd.write(byte(0)); // levý okraj
      continue;
    }
    if (pos == 9) {
      lcd.write(byte(2)); // pravý okraj
      continue;
    }

    int cell = pos - 1; // reálný index buňky 0–7

    // --- PLNÁ BUŇKA ---
    if (cell < fullCells) {
      lcd.write(255);
      continue;
    }

    // --- ČÁSTEČNĚ PLNÁ ---
    if (cell == fullCells && partial > 0) {
      switch (partial) {
        case 1: lcd.write(byte(0)); break; // bar0
        case 2: lcd.write(byte(3)); break; // b2
        case 3: lcd.write(byte(4)); break; // b3
        case 4: lcd.write(byte(5)); break; // b4
        case 5: lcd.write(255);     break; // plný
      }
      continue;
    }

    // --- PRÁZDNÁ BUŇKA ---
    lcd.write(byte(1)); // bar1
  }

  // --- Procenta ---
  lcd.setCursor(11, 0);
  if (p < 10) lcd.print(" ");
  lcd.print(p);
  lcd.print("%");
}