/*
 * =====================================================================================
 * ESP32-S3 INTERNET RGB CLOCK (8x8 Matrix) - Project 3- Night color with Date
 * =====================================================================================
 watch video https://youtube.com/shorts/4iWjLiD7fS8
 📚⬇️ Download and resource page https://robojax.com/RJT840
 * Author: Gemini (AI Thought Partner) & Ahmad Shamshiri (Robojax.com)
 * Date: 07 Jan 2026

 * * FEATURES:
 * 1. WiFi/NTP Time: Syncs automatically with internet time servers.
 * 2. Cycle-Based Color: Color changes ONLY after the time finishes a full scroll.
 * 3. Auto-Brightness: Dims the LEDs during night hours (User-configurable).
 * =====================================================================================
 */

#include <WiFi.h>
#include "time.h"
#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>

#define MATRIX_PIN 14

// --- BRIGHTNESS CONFIGURATION ---
const int DAY_BRIGHTNESS = 40;
const int NIGHT_BRIGHTNESS = 5;
const int NIGHT_START_HOUR = 22; // 10 PM
const int NIGHT_END_HOUR = 6;    // 6 AM

// --- COLOR CONFIGURATION ---
bool useFixedColor = false; 
int fixedColorIndex = 0;    
uint8_t userColors[][3] = {
  {17, 43, 171},  // Light Blue
  {255, 0, 0},    // Red
  {0, 255, 0},    // Green
  {255, 165, 0},  // Orange
  {255, 0, 255}   // Magenta
};

// 👇 REPLACE these with your real home WiFi name & password
const char* WIFI_SSID     = "WiFi";
const char* WIFI_PASSWORD = "passW0rd";

int currentColorIndex = 0;
int totalColors = sizeof(userColors) / sizeof(userColors[0]);

// --- INTERVALS ---
unsigned long lastTimeUpdateMs = 0;
const uint16_t timeUpdateIntervalMs = 1000;
unsigned long lastScrollMs = 0;
const uint16_t scrollIntervalMs = 100;

// --- GLOBAL VARIABLES ---
Adafruit_NeoMatrix matrix(8, 8, MATRIX_PIN,
  NEO_MATRIX_TOP    + NEO_MATRIX_LEFT +
  NEO_MATRIX_ROWS   + NEO_MATRIX_PROGRESSIVE,
  NEO_RGB           + NEO_KHZ800);

char timeText[6] = "00:00";
int16_t scrollX = 8;


const char* ntpServer = "pool.ntp.org";
const long  gmtOffset_sec     = -5 * 3600; 
const int   daylightOffset_sec = 3600;

void updateTimeText() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) return;
  
  // Format HH:MM
  snprintf(timeText, sizeof(timeText), "%02d:%02d", timeinfo.tm_hour, timeinfo.tm_min);

  // Apply Auto-Brightness
  if (timeinfo.tm_hour >= NIGHT_START_HOUR || timeinfo.tm_hour < NIGHT_END_HOUR) {
    matrix.setBrightness(NIGHT_BRIGHTNESS);
  } else {
    matrix.setBrightness(DAY_BRIGHTNESS);
  }
}

void scrollTime() {
  matrix.fillScreen(0);
  
  // Pick the color (Fixed or Cycle)
  int idx = useFixedColor ? fixedColorIndex : currentColorIndex;
  matrix.setTextColor(matrix.Color(userColors[idx][0], userColors[idx][1], userColors[idx][2]));

  matrix.setCursor(scrollX, 0);
  matrix.print(timeText);
  matrix.show();

  scrollX--;

  // Width for "HH:MM" is roughly 30 pixels
  int16_t textWidth = 30;
  
  // TRIGGER: When time is fully off-screen
  if (scrollX < -textWidth) {
    scrollX = matrix.width(); // Reset position to right side
    
    // Cycle to the next color in the array for the next pass
    if (!useFixedColor) {
      currentColorIndex = (currentColorIndex + 1) % totalColors;
      Serial.print("Next cycle color index: ");
      Serial.println(currentColorIndex);
    }
  }
}

void setup() {
  Serial.begin(115200);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  matrix.begin();
  matrix.setTextWrap(false);
  matrix.setBrightness(DAY_BRIGHTNESS);
  
  updateTimeText();
}

void loop() {
  unsigned long now = millis();

  // Update time digits and brightness once per second
  if (now - lastTimeUpdateMs >= timeUpdateIntervalMs) {
    lastTimeUpdateMs = now;
    updateTimeText(); 
  }

  // Handle the scrolling animation
  if (now - lastScrollMs >= scrollIntervalMs) {
    lastScrollMs = now;
    scrollTime();
  }
}