#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <NTPClient.h>
#include <WiFi.h>
#include <WiFiUdp.h>
#include <HTTPClient.h>

// Define pin connections
#define LDR_PIN 5
#define SWITCH_PIN 4
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels


#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// NTP Client setup
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", 0, 60000);

// Line Notify
const char* LINE_TOKEN = "ij3BTrbSEN804X54cvkb4h2FdneatPFXkENlWBrXlRp";

// Function to send a LINE notification
void sendLineNotification(String message) {
  HTTPClient http;
  http.begin("https://notify-api.line.me/api/notify");
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
  http.addHeader("Authorization", "Bearer " + String(LINE_TOKEN));
  int httpResponseCode = http.POST("message=" + message);
  if (httpResponseCode > 0) {
    String response = http.getString();
    Serial.println(response);
  } else {
    Serial.print("Error on sending POST: ");
    Serial.println(httpResponseCode);
  }
  http.end();
}

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize OLED display
  if(!display.begin(SSD1306_PAGEADDR, OLED_RESET)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();

  // Initialize LDR and switch pin
  pinMode(LDR_PIN, INPUT);
  pinMode(SWITCH_PIN, INPUT);

  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize time client
  timeClient.begin();
}

void loop() {
  // Update time client
  timeClient.update();
  String formattedDate = timeClient.getFormattedTime();

  // Read LDR value
  int ldrValue = analogRead(LDR_PIN);
  float voltage = ldrValue * (5.0 / 1023.0);
  float lux = voltage * 200;  // Adjust this based on your LDR calibration

  // Read switch status
  int switchState = digitalRead(SWITCH_PIN);

  // Display data on OLED
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.print("Date/Time: ");
  display.println(formattedDate);
  display.print("Switch: ");
  display.println(switchState == LOW ? "OFF" : "ON");
  display.print("LUX: ");
  display.println(lux);
  display.display();

  // Send LINE notifications based on conditions
  if (switchState == LOW) {
    sendLineNotification("Switch is OFF");
  }
  if (lux > 90000) {
    sendLineNotification("LUX value exceeds 90000");
  }

  // Delay before next loop
  delay(1000);
}