#define colorBtn 6
#define durationBtn 7

// LED Pins
#define RED_PIN 13
#define GREEN_PIN 12
#define BLUE_PIN 11

bool colors[][3] = {
  {1,1,1} , {1,0,0},{0,1,0},{0,0,1},  // wrgb
  {0,1,1} , {1,1,0},{1,0,1},{0,0,0}  // cymk
};

char* colorNames[] = {
  "white","red","green","blue",
  "cyan","yellow","megenta","black" // black is off, cycle limit will skip index 7
};

int delays[] = {
  1000, 800, 600, 400, 200
};

// Array limits
const int totalColors = 7; // Excludes "black" (index 7) from cycling
const int totalDelays = sizeof(delays) / sizeof(delays[0]);

// State variables
int colorIdx = 0;    // Initial: "white"
int delayIdx = 0;    // Initial: 1000 ms

unsigned long lastBlinkTime = 0;
bool ledState = false;

// Edge detection variables
bool lastColorBtnState = HIGH;
bool lastDurationBtnState = HIGH;

void setup() {
  Serial.begin(115200);

  // Configure LED pins
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);

  // Configure Button pins with internal pull-up resistors
  pinMode(colorBtn, INPUT_PULLUP);
  pinMode(durationBtn, INPUT_PULLUP);

  // Display initial settings
  Serial.println("RGB LED Controller Initialized");
  Serial.print("Initial Color: ");
  Serial.println(colorNames[colorIdx]);
  Serial.print("Initial Duration: ");
  Serial.print(delays[delayIdx]);
  Serial.println(" ms");
}

void loop() {
  unsigned long currentMillis = millis();

  // --- 1. Read Button Inputs (Active LOW with INPUT_PULLUP) ---
  bool colorBtnState = digitalRead(colorBtn);
  bool durationBtnState = digitalRead(durationBtn);

  // Handle Color Button press (Falling Edge)
  if (colorBtnState == LOW && lastColorBtnState == HIGH) {
    colorIdx = (colorIdx + 1) % totalColors; // Cycle through indices 0 to 6
    Serial.print("Color changed to: ");
    Serial.println(colorNames[colorIdx]);
    delay(150); // Software debounce
  }
  lastColorBtnState = colorBtnState;

  // Handle Duration Button press (Falling Edge)
  if (durationBtnState == LOW && lastDurationBtnState == HIGH) {
    delayIdx = (delayIdx + 1) % totalDelays; // Cycle through available delay speeds
    Serial.print("Duration changed to: ");
    Serial.print(delays[delayIdx]);
    Serial.println(" ms");
    delay(150); // Software debounce
  }
  lastDurationBtnState = durationBtnState;

  // --- 2. Non-blocking Blinking Logic ---
  if (currentMillis - lastBlinkTime >= delays[delayIdx]) {
    lastBlinkTime = currentMillis;
    ledState = !ledState;

    if (ledState) {
      digitalWrite(RED_PIN,   colors[colorIdx][0] ? HIGH : LOW);
      digitalWrite(GREEN_PIN, colors[colorIdx][1] ? HIGH : LOW);
      digitalWrite(BLUE_PIN,  colors[colorIdx][2] ? HIGH : LOW);
    } else {
      digitalWrite(RED_PIN,   LOW);
      digitalWrite(GREEN_PIN, LOW);
      digitalWrite(BLUE_PIN,  LOW);
    }
  }
}