#include <Keypad.h>
#include <Adafruit_NeoPixel.h>

const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
const byte NUM_LEDS = 16;
const byte LED_PIN = 10;
int position;
unsigned long lastMillis, currentMillis;

Adafruit_NeoPixel pixel(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);

char keys[ROWS][COLS] = {
  {'A', 'B', 'C', 'D'},
  {'E', 'F', 'G', 'H'},
  {'I', 'J', 'K', 'L'},
  {'M', 'N', 'O', 'P'},
};

int state[ROWS*COLS] = {0}; // Initialize all to 0

byte rowPins[COLS] = {2, 3, 4, 5}; //connect to the column pinouts of the kpd
byte colPins[ROWS] = {6, 7, 8, 9}; //connect to the row pinouts of the kpd

Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

// Function to get the index of the key in the keys array
int getKeyIndex(char key){
  for(int r = 0; r < ROWS; r++){
    for(int c = 0; c < COLS; c++){
      if(keys[r][c] == key) {
        return r * COLS + c; // Calculate the index
      }
    }
  }
  return -1; // Return -1 if the key is not found
}

// Function to turn on/off the LED at the given index
void setLED(int index, int r, int g, int b){
  if(index >= 0 && index < NUM_LEDS){
    pixel.setPixelColor(index, pixel.Color(r, g, b));
    pixel.show();
  }
}

void keypadRoutine(){
  if (kpd.getKeys()) {
    for (int i=0; i<16; i++) {
      if (kpd.key[i].stateChanged) {
        switch (kpd.key[i].kstate) {
          case PRESSED:
            position = getKeyIndex(kpd.key[i].kchar); // Get the index of the pressed key
            if(position != -1 && state[position] == 0){
              state[position] = 1; // Set the state to 1
              setLED(position, 255, 0, 0); // Turn the LED on
              Serial.printf("button %c at index %d is pressed, state is now ON\n", kpd.key[i].kchar, position);
            }
            break;
          case RELEASED:
            position = getKeyIndex(kpd.key[i].kchar); // Get the index of the released key
            if(position != -1 && state[position] == 1){
              state[position] = 0; // Set the state to 0
              setLED(position, 0, 0, 0); // Turn the LED off
              Serial.printf("button %c at index %d is released, state is now OFF\n", kpd.key[i].kchar, position);
            }
            break;
        }
      }
    }
  }
}


// void keypadRoutine(){
//   if (kpd.getKeys()) {
//     for (int i=0; i<LIST_MAX; i++) {
//       if (kpd.key[i].stateChanged) {
//         switch (kpd.key[i].kstate) {
//           case RELEASED:
//           case PRESSED:
//             position = getKeyIndex(kpd.key[i].kchar); // Get the index of the pressed key
//             if(position != -1){
//               state[position] = !state[position]; // Toggle the state
//               setLED(position, 255, 0, 0); // Set the LED color based on the state
//               Serial.printf("button %c at index %d is pressed, state is %d, %d key is pressed\n", kpd.key[i].kchar, position, state[position], sizeof(kpd.key)/sizeof(kpd.key[0]));
//             }
//             break;
//             // You can handle the RELEASED state if needed
//             break;
//         }
//       }
//     }
//   }
// }

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  pixel.begin();
  pixel.clear();  pixel.show();
}
int i = 0;
void loop() {
  // keypadRoutine();
      pixel.setPixelColor(i, pixel.Color(0, 0, 255));
     i++;
      pixel.show();
      delay(200);

}