#include <WiFi.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* LINE_TOKEN = "SnLUULkG1PxvNpR6rSLJoqUY3aIFlT9x2TRfeNLU29Z";

#define BUZZER_PIN 17
#define BUZZER_CHANNEL 0
#define pirpin 5

int val =0;
bool motionState = false;

int trigPin = 18;
int echoPin = 19;
int LedPinR = 8;
int LedPinG = 5;
 
LiquidCrystal_I2C lcd(0x27, 16, 2);
 
void setup() 
{
 pinMode(LedPinR, OUTPUT);
 pinMode(LedPinG, OUTPUT);
 pinMode(trigPin, OUTPUT);
 pinMode(echoPin, INPUT);
 pinMode(17, OUTPUT);
 pinMode(12, OUTPUT);
 pinMode(27, OUTPUT);
 pinMode(5, OUTPUT);

 WiFi.begin(ssid, password);
 while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

 ledcSetup(BUZZER_CHANNEL, 500, 8);
 ledcAttachPin(BUZZER_PIN, BUZZER_CHANNEL);

 lcd.init(); 
 lcd.backlight();
 
 Serial.begin(9600);
 Serial.print("Distance from the object :\n");
}
void loop() 
{ 
 int distance;
 int duration;
 val = digitalRead(5);
 if (val == HIGH && motionState == LOW)
  {
    Serial.println("Motion Sensor Detected!");
    digitalWrite(27, HIGH);
    digitalWrite(12, LOW);
    sendNotification("Room number... need help");
    motionState = HIGH;
    ledcWriteTone(BUZZER_CHANNEL,900);
    delay(100);
    ledcWriteTone(BUZZER_CHANNEL,300);
    delay(100);
  }
  else if (val == LOW && motionState == HIGH)
  {
   Serial.println("Motion Ended!");
   digitalWrite(27, LOW);
   digitalWrite(12, HIGH);
   ledcWriteTone(BUZZER_CHANNEL,0);
   motionState = LOW;
  }
 delay(100);
 digitalWrite(trigPin, LOW);
 delayMicroseconds(10);
 digitalWrite(trigPin, HIGH);
 delayMicroseconds(10);
 digitalWrite(trigPin, LOW);
 
 duration=pulseIn(echoPin,HIGH);
 distance = duration * 0.0344/2;
 
 Serial.print("DISTANCE : ");
 Serial.println(distance);

 lcd.clear();
 lcd.setCursor(0,0);
 lcd.print("ROOM NUMBER...");
 lcd.setCursor(0,1);
 lcd.print(distance);
}
void sendNotification(String message) 
{
  if (WiFi.status() == WL_CONNECTED) 
  {
    HTTPClient https;
    String url = "https://notify-api.line.me/api/notify";
    https.begin(url);
    https.addHeader("Authorization", "Bearer " + String(LINE_TOKEN));
    https.addHeader("Content-Type", "application/x-www-form-urlencoded");
    int httpCode = https.POST("message=" + message);
    if (httpCode == HTTP_CODE_OK) 
    {
      Serial.println("Notification sent!");
    } else 
    {
      Serial.println("Error sending notification: " + String(httpCode));
    }
    https.end();
  }
}