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

#define PIN 6 // Connect your matrix data pin to Arduino digital pin 6

// Configure a 32x8 NeoPixel Matrix
Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(32, 8, PIN,
  NEO_MATRIX_TOP     + NEO_MATRIX_LEFT +
  NEO_MATRIX_COLUMNS + NEO_MATRIX_PROGRESSIVE, // ✅ fixed typo
  NEO_GRB            + NEO_KHZ800);

// Timing configurations (in milliseconds)
const unsigned long PHASE_1_DURATION = 15000; // 15 seconds
const unsigned long PHASE_2_DURATION = 8000;  // 8 seconds
const unsigned long TOTAL_CYCLE_TIME = PHASE_1_DURATION + PHASE_2_DURATION;

// Animation Variables
int textX = 32; // Start text just off the right edge of the 32-column display
unsigned long lastScrollTime = 0;
const int scrollSpeed = 60; // Lower numbers = faster scrolling text

uint16_t randomColor;
uint16_t whiteColor = matrix.Color(255, 255, 255); // Pure white for Phase 2
int currentPhase = 1;
unsigned long phaseStartTime = 0;

void setup() {
  matrix.begin();
  matrix.setTextWrap(false);
  matrix.setBrightness(40); // Moderate brightness
  
  // Seed random generator and pick the initial random color
  randomSeed(analogRead(0));
  randomColor = matrix.Color(random(50, 256), random(50, 256), random(50, 256));
  phaseStartTime = millis();
}

void loop() {
  unsigned long currentTime = millis();
  unsigned long elapsedInPhase = currentTime - phaseStartTime;

  // --- STATE MACHINE LOGIC ---
  
  // Phase 1: AI CENTRE NANDURBAR (Random Color) - 15 Seconds
  if (currentPhase == 1) {
    if (elapsedInPhase >= PHASE_1_DURATION) {
      currentPhase = 2;
      phaseStartTime = currentTime;
      matrix.fillScreen(0);
      textX = 32;
    } else {
      scrollText("AI CENTRE NANDURBAR", randomColor);
    }
  }
  
  // Phase 2: CODE BY ARVIND (White Color) - 8 Seconds
  else if (currentPhase == 2) {
    if (elapsedInPhase >= PHASE_2_DURATION) {
      currentPhase = 1;
      phaseStartTime = currentTime;
      matrix.fillScreen(0);
      textX = 32;
      randomColor = matrix.Color(random(50, 256), random(50, 256), random(50, 256));
    } else {
      scrollText("CODE BY ARVIND", whiteColor);
    }
  }
}

// --- HELPER FUNCTION TO HANDLE SMOOTH SCROLLING ---
void scrollText(String text, uint16_t textColor) {
  if (millis() - lastScrollTime > scrollSpeed) {
    lastScrollTime = millis();
    
    matrix.fillScreen(0);
    matrix.setCursor(textX, 0);
    matrix.setTextColor(textColor);
    matrix.print(text);
    matrix.show();
    
    textX--; // Shift text one pixel left
    
    // More accurate text width calculation
    int16_t x1, y1;
    uint16_t w, h;
    matrix.getTextBounds(text, textX, 0, &x1, &y1, &w, &h);
    
    if (textX < -w) {
      textX = 32; 
    }
  }
}