#include <WiFi.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#include "Adafruit_MPU6050.h"
#include "Adafruit_Sensor.h"
#include "ThingSpeak.h"
#include <HTTPClient.h>

// Pin Definitions
#define DHT_PIN 15
#define LED_PIN 33
#define LDR_PIN 35
#define RELAY_PIN 18
#define TRIG_PIN 5
#define ECHO_PIN 18

// Constants
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701

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

// ThingSpeak Settings
const int myChannelNumber = 2316429;
const char* myApiKey = "5N2SPHOB5AEX1IKU";

// Sensor and Display Initializations
DHT dht(DHT_PIN, DHT22);
LiquidCrystal_I2C lcd(0x27, 20, 4);
Adafruit_MPU6050 mpu;
WiFiClient client;

// Function Prototypes
void connectToWiFi();
void sendDataToThingSpeak(float temperature, float humidity);
void sendDataToServer(float soilMoisture, float lux, float temperature, float humidity);
float readSoilMoisture();
float readLightIntensity();
float readDistance();

void setup() {
  Serial.begin(9600);
  connectToWiFi();
  
  dht.begin();
  lcd.init();
  lcd.backlight();

  pinMode(LED_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT); 
  pinMode(ECHO_PIN, INPUT);

  ThingSpeak.begin(client);

  if (!mpu.begin()) {
    Serial.println("Failed to find MPU6050 chip");
    while (1);
  }
  mpu.setAccelerometerRange(MPU6050_RANGE_8_G);
  mpu.setGyroRange(MPU6050_RANGE_500_DEG);
  mpu.setFilterBandwidth(MPU6050_BAND_5_HZ);
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  float soilMoisture = readSoilMoisture();
  float lightIntensity = readLightIntensity();
  float distance = readDistance();

  sensors_event_t a, g, temp;
  mpu.getEvent(&a, &g, &temp);

  // Update ThingSpeak
  sendDataToThingSpeak(temperature, humidity);

  // Update custom server
  sendDataToServer(soilMoisture, lightIntensity, temperature, humidity);

  // Display data on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Hum: ");
  lcd.print(humidity);
  lcd.print(" %");
  lcd.setCursor(0, 2);
  lcd.print("Soil: ");
  lcd.print(soilMoisture);
  lcd.print(" %");
  lcd.setCursor(0, 3);
  lcd.print("Light: ");
  lcd.print(lightIntensity);
  lcd.print(" Lux");

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(2000); // Delay for readability
}

void connectToWiFi() {
  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
}

float readDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  long duration = pulseIn(ECHO_PIN, HIGH);
  float distanceCm = duration * SOUND_SPEED / 2;
  return distanceCm;
}


void sendDataToThingSpeak(float temperature, float humidity) {
  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, humidity);
  if (ThingSpeak.writeFields(myChannelNumber, myApiKey) != 200) {
    Serial.println("Error sending data to ThingSpeak");
  } else {
    Serial.println("ThingSpeak update successful");
  }
}

void sendDataToServer(float soilMoisture, float lux, float temperature, float humidity) {
  HTTPClient http;
  http.begin("http://172.111.138.132:8000/post"); // Replace with your server's URL
  http.addHeader("Content-Type", "application/json");

  String httpRequestData = "{\"soil_moisture\": " + String(soilMoisture)
                         + ", \"lux\": " + String(lux)
                         + ", \"temperature\": " + String(temperature)
                         + ", \"humidity\": " + String(humidity) + "}";
  int httpResponseCode = http.POST(httpRequestData);

  if (httpResponseCode == HTTP_CODE_OK) {
    Serial.println("Data sent successfully");
  } else {
    Serial.print("Error sending data: ");
    Serial.println(httpResponseCode);
    Serial.println(http.getString()); // Print server response
  }
  http.end();
}


float readSoilMoisture() {
  int sensorValue = analogRead(34); // Assuming the soil moisture sensor is connected to pin 34
  return map(sensorValue, 0, 4095, 100, 0); // Mapping the value to a percentage
}

float readLightIntensity() {
  int sensorValue = analogRead(35); // Assuming the LDR is connected to pin 35
  float voltage = sensorValue * (5.0 / 4095.0); // Converting to voltage
  float resistance = (5.0 - voltage) * 10000 / voltage; // Calculating resistance
  return 500 / resistance; // Converting resistance to Lux (example calculation)
}