#include <WiFi.h>
#include <ThingSpeak.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <OneWire.h>
#include <DallasTemperature.h>

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

// ThingSpeak API credentials
unsigned long channelID = 3062508; // ThingSpeak Channel ID
const char* apiKey = "Z2OZTWS7IAU08D91"; // ThingSpeak Write API Key

// Pin definitions
const int pirPin = 23;  // PIR sensor connected to GPIO 23
const int redLedPin = 22;  // Red LED for WiFi status
const int greenLedPin = 21;  // Green LED for motion detection
const int oneWireBus = 0;  // DS18B20 sensor data pin (GPIO 0)

// Setup OneWire and DallasTemperature instances
OneWire oneWire(oneWireBus);
DallasTemperature sensors(&oneWire);

// LCD configuration
LiquidCrystal_I2C lcd(0x27, 16, 2); // Adjust the I2C address if necessary

WiFiClient client; // WiFi client for ThingSpeak

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

  // Initialize LCD
  Wire.begin(18, 5);  // SDA -> GPIO 18, SCL -> GPIO 5
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Connecting...");

  // Initialize LEDs
  pinMode(redLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  digitalWrite(redLedPin, LOW);  // Red LED OFF initially
  digitalWrite(greenLedPin, LOW);  // Green LED OFF initially

  // Initialize PIR sensor
  pinMode(pirPin, INPUT);

  // Initialize DS18B20 sensor
  sensors.begin();

  // Check if the DS18B20 sensor is found
  uint8_t sensorAddress[8];
  if (!sensors.getAddress(sensorAddress, 0)) {
    Serial.println("DS18B20 not found!");
    lcd.clear();
    lcd.print("Temp Sensor Err");
    while (1); // Halt execution if sensor not found
  }

  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(10);
    Serial.println("Connecting to WiFi...");
    lcd.setCursor(0, 1);
    lcd.print("WiFi Connecting...");
    digitalWrite(redLedPin, LOW); // Red LED OFF while connecting
  }
  Serial.println("Connected to WiFi!");
  lcd.clear();
  lcd.print("WiFi Connected");
  digitalWrite(redLedPin, HIGH); // Red LED ON when connected

  // Initialize ThingSpeak
  ThingSpeak.begin(client);

  delay(1000); // Wait for setup display
  lcd.clear();
  lcd.print("Setup Complete");
}

void loop() {
  // Request temperature from DS18B20 sensor
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0); // Read the temperature from the first sensor

  // Check if temperature reading is valid
  if (temperature == -127.00) {
    Serial.println("Failed to read temperature!");
    temperature = 0.0; // Set to 0 if reading fails
  }

  // Display Temperature on LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: " + String(temperature) + "C");

  // Read PIR sensor
  int motionDetected = digitalRead(pirPin);

  if (motionDetected) {
    // Motion detected
    Serial.println("Motion Detected!");
    lcd.setCursor(0, 1);
    lcd.print("Motion Detected!");
    digitalWrite(greenLedPin, HIGH); // Turn on green LED
  } else {
    // No motion
    lcd.setCursor(0, 1);
    lcd.print("No Motion       ");
    digitalWrite(greenLedPin, LOW); // Turn off green LED
  }

  // Send data to ThingSpeak
  ThingSpeak.setField(1, temperature); // Set temperature in Field 1
  ThingSpeak.setField(2, motionDetected); // Set motion status in Field 2

  int response = ThingSpeak.writeFields(channelID, apiKey); // Send data to ThingSpeak
  if (response == 200) {
    Serial.println("Data sent to ThingSpeak successfully!");
  } else {
    Serial.println("Error sending data to ThingSpeak: " + String(response));
  }

  delay(20000); // ThingSpeak allows updates every 15-20 seconds
}