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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

RTC_DS1307 rtc;

const int sensorPin = A0;

// Kalibrasyon Değerleri (Kapasitif Sensör v1.2)
const int KURU_DEGER = 580;  
const int ISLAK_DEGER = 280; 
const int KRITIK_NEM_ESIGI = 30; // %30 altı acil durum uyanması

// 1. Pixel Art Saksı ve Fidan İkonu (Gündüz)
const unsigned char PROGMEM pot_icon16x16[] = {
  0b00000001, 0b10000000,
  0b00000011, 0b11000000,
  0b00011001, 0b10011000,
  0b00111101, 0b10111100,
  0b00111111, 0b11111100,
  0b00011101, 0b10111000,
  0b00000001, 0b10000000,
  0b01111111, 0b11111110,
  0b01111111, 0b11111110,
  0b00111111, 0b11111100,
  0b00111111, 0b11111100,
  0b00111111, 0b11111100,
  0b00111111, 0b11111100,
  0b00011111, 0b11111000,
  0b00011111, 0b11111000,
  0b00001111, 0b11110000
};

// 2. Kapalı Form Tam Hilal Ay (16x16 - Gece)
const unsigned char PROGMEM hilal_tam_16x16[] = {
  0b00000111, 0b11100000,
  0b00011111, 0b11110000,
  0b00111111, 0b11000000,
  0b01111110, 0b00000000,
  0b01111100, 0b00000000,
  0b11111000, 0b00000000,
  0b11111000, 0b00000000,
  0b11111000, 0b00000000,
  0b11111000, 0b00000000,
  0b11111000, 0b00000000,
  0b01111100, 0b00000000,
  0b01111110, 0b00000000,
  0b00111111, 0b00000000,
  0b00111111, 0b11000000,
  0b00011111, 0b11110000,
  0b00000111, 0b11100000
};

unsigned long sonGuncelleme = 0;

void setup() {
  Serial.begin(9600);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("OLED Bulunamadi!"));
    for(;;);
  }

  display.setRotation(2);

  if (!rtc.begin()) {
    Serial.println(F("RTC Bulunamadi!"));
    for(;;);
  }

  // RTC çalışmıyorsa veya pili yeni takıldıysa derleme anındaki gerçek saate ayarlar
  if (!rtc.isrunning()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
}

void cizGunduzEkrani(DateTime now, int nemYuzde) {
  display.clearDisplay();

  // 1. İkon
  display.drawBitmap(4, 0, pot_icon16x16, 16, 16, SSD1306_WHITE);

  // 2. Başlık
  display.setTextSize(1);
  display.setCursor(26, 4);
  display.print("SMART PLANTER");
  display.drawFastHLine(0, 18, 128, SSD1306_WHITE);

  // 3. Saat
  display.setTextSize(2);
  display.setCursor(35, 22);
  if (now.hour() < 10) display.print("0");
  display.print(now.hour());
  display.print(":");
  if (now.minute() < 10) display.print("0");
  display.print(now.minute());
  display.drawFastHLine(0, 39, 128, SSD1306_WHITE);

  // 4. Nem ve Durum
  display.setTextSize(1);
  display.setCursor(4, 43);
  display.print("NEM: %");
  display.print(nemYuzde);

  display.setCursor(75, 43);
  if(nemYuzde < KRITIK_NEM_ESIGI) {
    display.print("[KURU!]");
  } else if(nemYuzde <= 70) {
    display.print("[IDEAL]");
  } else {
    display.print("[ISLAK]");
  }

  // 5. Progress Bar
  display.drawRect(4, 54, 120, 8, SSD1306_WHITE);
  int barWidth = map(nemYuzde, 0, 100, 0, 116);
  display.fillRect(6, 56, barWidth, 4, SSD1306_WHITE);

  display.display();
}

void cizGeceUykuEkrani() {
  display.clearDisplay();

  // Hilal Ay İkonu (X: 42, Y: 24)
  display.drawBitmap(42, 24, hilal_tam_16x16, 16, 16, SSD1306_WHITE);

  // Kademeli Yükselen Zzz
  display.setTextSize(1);
  display.setCursor(65, 32);
  display.print("z");

  display.setCursor(75, 22);
  display.print("z");

  display.setCursor(86, 12);
  display.print("Z");

  display.display();
}

void loop() {
  if (millis() - sonGuncelleme >= 100) {
    sonGuncelleme = millis();

    // Analog okuma kararlılığı için çift okuma
    analogRead(sensorPin); 
    int sensorRaw = analogRead(sensorPin);

    int nemYuzde = map(sensorRaw, KURU_DEGER, ISLAK_DEGER, 0, 100);
    nemYuzde = constrain(nemYuzde, 0, 100);

    DateTime now = rtc.now();
    int saat = now.hour();

    bool geceMi = (saat >= 0 && saat < 6);
    bool kritikKuruMu = (nemYuzde < KRITIK_NEM_ESIGI);

    if (!geceMi || (geceMi && kritikKuruMu)) {
      cizGunduzEkrani(now, nemYuzde);
    } else {
      cizGeceUykuEkrani();
    }
  }
}