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

#define WDT_TIMEOUT 10

// กำหนดขนาดหน้าจอ OLED
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// กำหนด pin I2C สำหรับ ESP32
#define SDA_PIN 22
#define SCL_PIN 23

// กำหนดที่อยู่ I2C สำหรับอุปกรณ์
#define OLED_ADDRESS 0x3C

// สร้างอ็อบเจกต์สำหรับ OLED และ MCP23017
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

#define LED_ONBOARD 5
#define SW1 17
#define SW2 16
#define PIR 21
#define POTEN 34

bool toogleLED = true;
bool autoMode = true;
bool manualLED = true;

unsigned long lasttime1000ms;
unsigned long lasttime10000ms;
unsigned long lastMovement;

int val = 0;
int val_POTEN = 0;
int brightness = 0;

void setup() {
  Serial.begin(115200);
  pinMode(LED_ONBOARD, OUTPUT);

  pinMode(SW1, INPUT_PULLUP);
  pinMode(SW2, INPUT_PULLUP);

  pinMode(PIR, INPUT);

  digitalWrite(LED_ONBOARD, LOW);

  // เริ่มต้น Wire (I2C)
  Wire.begin(SDA_PIN, SCL_PIN);
  // เริ่มต้น OLED display
  if(!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // ไม่ทำงานต่อหาก OLED ไม่พร้อม
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("ESP32 I2C MCP23017");
  display.display();

  Serial.println("Configuring WDT...");
  esp_task_wdt_init(WDT_TIMEOUT, true); //enable panic so ESP32 restarts
  esp_task_wdt_add(NULL); //add current thread to WDT watch
}

void loop() {
  if(millis()-lasttime1000ms>=1000){
    lasttime1000ms = millis();

    if (digitalRead(SW1) == LOW) {
      autoMode = !autoMode;
    }

    if(autoMode == true){
      if(toogleLED == true){
        digitalWrite(LED_ONBOARD, LOW);
        toogleLED = false;
      } else {
        digitalWrite(LED_ONBOARD, HIGH);
        toogleLED = true;
      }
    } else {
      if (digitalRead(SW2) == LOW) {
        manualLED = !manualLED;
      }

      if(manualLED == true){
        digitalWrite(LED_ONBOARD, HIGH);
      } else {
        digitalWrite(LED_ONBOARD, LOW);
      }
    }

    val = digitalRead(PIR);
    val_POTEN = analogRead(POTEN);
    brightness = map(val_POTEN, 0, 4095, 0, 255); 
    if (val == 0) {
      if(millis()-lastMovement>=10000){

        digitalWrite(LED_ONBOARD, LOW);
      }

      Serial.println("No movement.");
      display.clearDisplay();
      display.setCursor(0, 0);
      display.println("No movement.");
      display.display();
    }
    else {
      Serial.println("There is movement.");
      Serial.println(brightness);
      digitalWrite(LED_ONBOARD, brightness);
      lastMovement = millis();

      display.clearDisplay();
      display.setCursor(0, 0);
      display.println("There is movement.");
      display.display();
    }
  }
}