// https://forum.arduino.cc/t/independent-neopixel-with-independent-buttons-single-arduino-nano/1430695/15

#include <Adafruit_NeoPixel.h>
int BUTTON_PIN[] = {2, 3, 4, 5, 6};
int PIXEL_PIN[] = {8, 9, 10, 11, 12};

#define PIXEL_COUNT 1  // Number of NeoPixels

Adafruit_NeoPixel strip[] = { // array of five objects
  Adafruit_NeoPixel (PIXEL_COUNT, PIXEL_PIN[0], NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel (PIXEL_COUNT, PIXEL_PIN[1], NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel (PIXEL_COUNT, PIXEL_PIN[2], NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel (PIXEL_COUNT, PIXEL_PIN[3], NEO_GRB + NEO_KHZ800),
  Adafruit_NeoPixel (PIXEL_COUNT, PIXEL_PIN[4], NEO_GRB + NEO_KHZ800),
};

bool oldState[] = {HIGH, HIGH, HIGH, HIGH, HIGH}, newState[5];
int mode[] = {0, 0, 0, 0, 0};
long firstPixelHue;
unsigned long timer[5], timeout[] = {10, 10, 10, 10, 10};

void setup() {
  Serial.begin(115200);
  for (byte i = 0; i < 5; i++) {
    pinMode(BUTTON_PIN[i], INPUT_PULLUP);
    strip[i].begin();
    strip[i].show();
  }
}

void loop() {
  // Get current button state.
  for (byte i = 0; i < 5; i++) {
    newState[i] = digitalRead(BUTTON_PIN[i]);

    // Check if state changed from high to low (button press).
    if ((newState[i] == LOW) && (oldState[i] == HIGH)) {
      delay(20); // debounce

      // Check if button is still low after debounce.
      newState[i] = digitalRead(BUTTON_PIN[i]);
      if (newState[i] == LOW) {        // Yes, still low
        if (++mode[i] > 10)
          mode[i] = 0;  // Advance to next mode, wrap around after #8
        switch (mode[i]) {             // Start the new animation...
          case 0:
            colorWipe(strip[i].Color(0, 0, 0), 50, i);  // Black/off
            break;
          case 1:
            colorWipe(strip[i].Color(255, 0, 0), 50, i);  // Red
            break;
          case 2:
            colorWipe(strip[i].Color(0, 255, 0), 50, i);  // Green
            break;
          case 3:
            colorWipe(strip[i].Color(0, 0, 255), 50, i);  // Blue
            break;
          case 4:
            colorWipe(strip[i].Color(255, 255, 255), 50, i);  // White
            break;
          case 5:
            colorWipe(strip[i].Color(255, 255, 0), 50, i);  // Yellow
            break;
          case 6:
            colorWipe(strip[i].Color(255, 25, 125), 50, i);  // Hot Pink
            break;
          case 7:
            colorWipe(strip[i].Color(255, 150, 50), 50, i);  // Warm White
            break;
          case 8:
            colorWipe(strip[i].Color(255, 65, 255), 50, i);  // Purple
            break;
          case 9:
            colorWipe(strip[i].Color(50, 200, 255), 50, i);  // Light Blue
            break;
          case 10:
            rainbow(10, i);
            break;
          default: break;
        }
      }
    }
    // Set the last-read button state to the old state.
    oldState[i] = newState[i];
  }
}

void colorWipe(uint32_t color, int wait, int s) {
  for (int i = 0; i < strip[s].numPixels(); i++) {  // For each pixel in strip...
    strip[s].setPixelColor(i, color);               //  Set pixel's color (in RAM)
    strip[s].show();                                //  Update strip to match
  }
}

// Rainbow cycle along whole strip. Pass delay time (in ms) between frames.
void rainbow(int wait, int s) {
  for (long firstPixelHue = 0; firstPixelHue < 3 * 65536; firstPixelHue += 256) {
    strip[s].setPixelColor(0, strip[s].gamma32(strip[s].ColorHSV(firstPixelHue)));
    strip[s].show();  // Update strip with new contents
    delay(wait);    // Pause for a moment
  }

  // This is the timer that would make each LED color-fade, but for the one-shot call
  // if (millis() - timer[s] > timeout[s]) {
  //   timer[s] = millis();
  //   if ((firstPixelHue += 256) > (3 * 65536L))
  //     firstPixelHue = 0;
  //   strip[s].setPixelColor(0, strip[s].gamma32(strip[s].ColorHSV(firstPixelHue)));
  //   strip[s].show();  // Update strip with new contents
  // }
}