#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>

#define PIN 10

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(
  32, 8, PIN,
  NEO_MATRIX_TOP + NEO_MATRIX_LEFT +
  NEO_MATRIX_ROWS + NEO_MATRIX_PROGRESSIVE,
  NEO_GRB + NEO_KHZ800);

uint8_t mode = 0;
uint32_t lastSwitch = 0;
uint16_t frame = 0;

// =========================
// FAST COLOR WHEEL
// =========================
uint16_t colorWheel(byte pos) {

  pos = 255 - pos;

  if (pos < 85) {
    return matrix.Color(255 - pos * 3, 0, pos * 3);
  }

  if (pos < 170) {
    pos -= 85;
    return matrix.Color(0, pos * 3, 255 - pos * 3);
  }

  pos -= 170;
  return matrix.Color(pos * 3, 255 - pos * 3, 0);
}

void setup() {

  matrix.begin();

  matrix.setBrightness(70);

  matrix.setTextWrap(false);

  matrix.fillScreen(0);

  matrix.show();
}

void loop() {

  // Change mode every 6 seconds
  if (millis() - lastSwitch > 6000) {

    mode = (mode + 1) % 5;

    lastSwitch = millis();

    frame = 0;

    matrix.fillScreen(0);
  }

  switch (mode) {

    // =================================
    // MODE 0 : RAINBOW STRIPES
    // =================================
    case 0:

      for (int x = 0; x < 32; x++) {

        uint16_t c = colorWheel((x * 8 + frame) & 255);

        for (int y = 0; y < 8; y++) {

          matrix.drawPixel(x, y, c);
        }
      }

      break;

    // =================================
    // MODE 1 : ONE COLOR GRID
    // =================================
    case 1:

      matrix.fillScreen(0);

      for (int x = 0; x < 32; x += 2) {

        for (int y = 0; y < 8; y++) {

          matrix.drawPixel(x, y, matrix.Color(0, 255, 0));
        }
      }

      for (int y = 0; y < 8; y += 2) {

        for (int x = 0; x < 32; x++) {

          matrix.drawPixel(x, y, matrix.Color(0, 255, 0));
        }
      }

      break;

    // =================================
    // MODE 2 : EMOJI SMILEY
    // =================================
    case 2:

      matrix.fillScreen(0);

      // Face
      for (int x = 10; x < 22; x++) {
        for (int y = 1; y < 7; y++) {
          matrix.drawPixel(x, y, matrix.Color(255, 200, 0));
        }
      }

      // Eyes
      matrix.drawPixel(13, 2, matrix.Color(0, 0, 0));
      matrix.drawPixel(18, 2, matrix.Color(0, 0, 0));

      // Smile
      matrix.drawPixel(13, 5, matrix.Color(255, 0, 0));
      matrix.drawPixel(14, 6, matrix.Color(255, 0, 0));
      matrix.drawPixel(15, 6, matrix.Color(255, 0, 0));
      matrix.drawPixel(16, 6, matrix.Color(255, 0, 0));
      matrix.drawPixel(17, 6, matrix.Color(255, 0, 0));
      matrix.drawPixel(18, 5, matrix.Color(255, 0, 0));

      break;

    // =================================
    // MODE 3 : SCROLLING AI CENTRE
    // =================================
    case 3: {

        static int textX1 = 32;

        matrix.fillScreen(0);

        matrix.setTextColor(colorWheel(frame));

        matrix.setCursor(textX1, 0);

        matrix.print("AI CENTRE");

        textX1--;

        if (textX1 < -70) {
          textX1 = 32;
        }
      }

      break;

    // =================================
    // MODE 4 : BY ARVIND SCROLL
    // =================================
    case 4: {

        static int textX2 = 32;

        matrix.fillScreen(0);

        matrix.setTextColor(matrix.Color(0, 255, 255));

        matrix.setCursor(textX2, 0);

        matrix.print("BY ARVIND");

        textX2--;

        if (textX2 < -80) {
          textX2 = 32;
        }
      }

      break;
  }

  matrix.show();

  frame++;

  delay(30);
}