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// Pin Definitions
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const int ledPins[] = {2, 3, 4, 5};       // Red, Green, Blue, Yellow
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const int buttonPins[] = {8, 9, 10, 11};   // Red, Green, Blue, Yellow
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const int buzzerPin = 6;
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// Audio Frequencies for each button (Red, Green, Blue, Yellow)
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const int tones[] = {262, 330, 392, 523}; // C4, E4, G4, C5
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const int loseTone = 120;                  // Sad, low buzz for game over
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// Game Variables
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#define MAX_SEQUENCE 100
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int sequence[MAX_SEQUENCE];
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int gameRound = 0;
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void setup() {
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  // Initialize LEDs and Buttons
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  for (int i = 0; i < 4; i++) {
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    pinMode(ledPins[i], OUTPUT);
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    pinMode(buttonPins[i], INPUT); // External pull-up, so standard INPUT
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    digitalWrite(ledPins[i], LOW);
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  }
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  pinMode(buzzerPin, OUTPUT);
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  // Seed random generator using noise from unconnected analog pin
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  randomSeed(analogRead(A0));
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  delay(1000); // Brief pause before game starts automatically
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}
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void loop() {
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  // 1. Add a new random step to the sequence (0 to 3)
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  sequence[gameRound] = random(0, 4);
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  gameRound++;
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  // 2. Play the current sequence to the player
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  playSequence();
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  // 3. Get and check player inputs
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  if (!getPlayerInput()) {
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    gameOver();
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    // Reset game state
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    gameRound = 0;
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    delay(1500);
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    return;
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  }
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  delay(600); // Pause before next round starts
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}
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// Function to play the stored sequence
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void playSequence() {
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  for (int i = 0; i < gameRound; i++) {
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    int currentStep = sequence[i];
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    digitalWrite(ledPins[currentStep], HIGH);
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    tone(buzzerPin, tones[currentStep], 300);
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    delay(300);
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    digitalWrite(ledPins[currentStep], LOW);
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    delay(1500 / (gameRound + 2)); // Dynamic pacing gets slightly faster
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  }
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}
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// Function to capture and validate user input
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bool getPlayerInput() {
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  for (int i = 0; i < gameRound; i++) {
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    int expectedButton = sequence[i];
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    int pressedButton = -1;
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    // Wait until a button is pressed
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    while (pressedButton == -1) {
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      for (int b = 0; b < 4; b++) {
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        // Active LOW due to external pull-ups
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        if (digitalRead(buttonPins[b]) == LOW) {
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          pressedButton = b;
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          // Provide instant feedback for the press
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          digitalWrite(ledPins[b], HIGH);
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          tone(buzzerPin, tones[b]);
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          // Debounce and wait for release
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          delay(50);
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          while (digitalRead(buttonPins[b]) == LOW);
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          delay(50);
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          noTone(buzzerPin);
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          digitalWrite(ledPins[b], LOW);
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          break;
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        }
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      }
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    }
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    // Check if the pressed button matches the sequence
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    if (pressedButton != expectedButton) {
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      return false; // Wrong button pressed
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    }
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  }
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  return true; // Whole round cleared successfully
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}
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// Game Over Animation and Sound
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void gameOver() {
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  // Low pitch buzz to signify failure
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  tone(buzzerPin, loseTone, 800);
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  // Blink all four LEDs 3 times
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  for (int i = 0; i < 3; i++) {
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    for (int l = 0; l < 4; l++) {
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      digitalWrite(ledPins[l], HIGH);
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    }
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    delay(250);
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    for (int l = 0; l < 4; l++) {
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      digitalWrite(ledPins[l], LOW);
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    }
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    delay(250);
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  }
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  noTone(buzzerPin);
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}