// ESP32 + PIR + LDR Modülü + Röle + OLED
// Akıllı Aydınlatma — karanlık + hareket → ışık 30sn yansın

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define PIR_PIN       14
#define LDR_PIN       34
#define RELAY_PIN     5

#define LIGHT_ON_MS   30000    // 30 sn yanık kal
#define LDR_DARK      2000     // Bu değerin ÜSTÜ karanlık (LDR modülü ters)

#define SCREEN_W 128
#define SCREEN_H 64
#define OLED_ADDR 0x3C

Adafruit_SSD1306 oled(SCREEN_W, SCREEN_H, &Wire, -1);

bool lightOn = false;
unsigned long lastMotionMs = 0;
int  ldrVal = 0;
bool motionState = false;

// ============ Helpers ============
void lcdAt(int x, int y, uint8_t size, const String &text) {
  oled.setTextSize(size);
  oled.setCursor(x, y);
  oled.print(text);
}

void centered(uint8_t y, uint8_t size, const String &text) {
  int charW = 6 * size;
  int w = text.length() * charW;
  int x = (128 - w) / 2;
  if (x < 0) x = 0;
  lcdAt(x, y, size, text);
}

// ============ Ekranlar ============
void drawSplash() {
  oled.clearDisplay();
  oled.setTextColor(SSD1306_WHITE);
  lcdAt(6, 10, 2, "BlueGrays");
  lcdAt(2, 40, 1, "Akilli Aydinlatma");
  oled.drawRoundRect(2, 2, 124, 60, 6, SSD1306_WHITE);
  oled.display();
}

void drawStatus() {
  oled.clearDisplay();
  oled.setTextColor(SSD1306_WHITE);

  // Ust: baslik
  lcdAt(0, 0, 1, "> Akilli Aydinlatma");
  oled.drawLine(0, 10, 127, 10, SSD1306_WHITE);

  // ORTA: buyuk durum (size 3) + tek satir aciklama (size 1)
  if (lightOn) {
    unsigned long remain = (LIGHT_ON_MS - (millis() - lastMotionMs)) / 1000;
    centered(16, 3, "ACIK");
    centered(44, 1, String(remain) + " saniye kaldi");
  } else if (ldrVal < LDR_DARK) {
    centered(16, 3, "GUNDUZ");
    centered(44, 1, "Aydinlik ortam");
  } else {
    centered(16, 3, "BEKLE");
    centered(44, 1, "Hareket bekliyor");
  }

  // Alt cizgi
  oled.drawLine(0, 53, 127, 53, SSD1306_WHITE);

  // ALT: Sensor bilgileri tek satir
  lcdAt(0, 55, 1, "LDR:" + String(ldrVal));
  lcdAt(72, 55, 1, "PIR:" + String(motionState ? "VAR" : "YOK"));

  oled.display();
}

// ============ SETUP ============
void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);

  Wire.begin();
  if (!oled.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
    while (1);
  }

  drawSplash();
  delay(2500);

  analogReadResolution(12);
}

// ============ LOOP ============
void loop() {
  ldrVal = analogRead(LDR_PIN);
  motionState = digitalRead(PIR_PIN) == HIGH;

  // Karanlık + hareket → ışık yak, timer sıfırla
  if (motionState && ldrVal >= LDR_DARK) {
    if (!lightOn) {
      lightOn = true;
      digitalWrite(RELAY_PIN, HIGH);
    }
    lastMotionMs = millis();
  }

  // Süre bitti
  if (lightOn && (millis() - lastMotionMs > LIGHT_ON_MS)) {
    lightOn = false;
    digitalWrite(RELAY_PIN, LOW);
  }

  // 500ms'de bir ekran
  static unsigned long lastDraw = 0;
  if (millis() - lastDraw > 500) {
    lastDraw = millis();
    drawStatus();
  }

  delay(50);
}