#include <Adafruit_NeoPixel.h>

#define LED_PIN     6
#define LED_COUNT   10        // Solo 10 LED usati

#define MUX1_COM    8
#define MUX2_COM    7
#define MUX_S0      12
#define MUX_S1      11
#define MUX_S2      10
#define MUX_S3      9

Adafruit_NeoPixel leds(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);

// Struttura per ogni switch: mux (1 o 2), canale base (pari)
struct Switch {
  uint8_t mux;      // 1 = mux1, 2 = mux2
  uint8_t channel;  // canale del throw sinistro (es. 0, 2, 4...)
};

Switch switches[10] = {
  {1, 0},   // sw9  → I0/I1 mux1
  {1, 2},   // sw8  → I2/I3
  {1, 4},   // sw7  → I4/I5
  {1, 6},   // sw6  → I6/I7
  {1, 8},   // sw10 → I8/I9
  {1, 10},  // sw4  → I10/I11
  {1, 12},  // sw3  → I12/I13
  {1, 14},  // sw2  → I14/I15
  {2, 0},   // sw1  → I0/I1 mux2
  {2, 2}    // sw5  → I2/I3 mux2
};

void selectMux(uint8_t ch) {
  digitalWrite(MUX_S0, ch & 0x01);
  digitalWrite(MUX_S1, (ch >> 1) & 0x01);
  digitalWrite(MUX_S2, (ch >> 2) & 0x01);
  digitalWrite(MUX_S3, (ch >> 3) & 0x01);
}

void setup() {
  pinMode(MUX_S0, OUTPUT);
  pinMode(MUX_S1, OUTPUT);
  pinMode(MUX_S2, OUTPUT);
  pinMode(MUX_S3, OUTPUT);

  pinMode(MUX1_COM, INPUT_PULLUP);
  pinMode(MUX2_COM, INPUT_PULLUP);

  leds.begin();
  leds.setBrightness(80);
  leds.clear();
  leds.show();
}

void loop() {
  for (uint8_t i = 0; i < 10; i++) {
    uint8_t ch = switches[i].channel;

    // Leggi il canale sinistro (es. I0, I2, ...)
    selectMux(ch);
    delayMicroseconds(200);
    bool left = (switches[i].mux == 1) ? digitalRead(MUX1_COM) : digitalRead(MUX2_COM);

    // Leggi il canale destro (ch+1)
    selectMux(ch + 1);
    delayMicroseconds(200);
    bool right = (switches[i].mux == 1) ? digitalRead(MUX1_COM) : digitalRead(MUX2_COM);

    uint32_t color;

    if (!left && right) {
      color = leds.Color(255, 0, 0);   // Rosso: levetta a sinistra
    }
    else if (left && !right) {
      color = leds.Color(0, 0, 255);   // Blu: levetta a destra
    }
    else {
      color = 0;                       // Spento: centro o errore
      // Alternativa: color = leds.Color(20, 0, 20); // viola dim per centro
    }

    leds.setPixelColor(i, color);
  }

  leds.show();
}