#include <WiFi.h>
#include <Wire.h>
#include <DHT.h>
#include <PubSubClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// Define pin numbers
#define DHTPIN 4
#define DHTTYPE DHT22
#define FAN_IN_PIN 12
#define FAN_OUT_PIN 13
#define RELAY_PIN 14
#define MQ135_PIN 34
#define DSM501A_PIN 35
#define DS18B20_PIN 5
#define SOLAR_PANEL_PIN 36

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Initialize DS18B20 sensor
OneWire oneWire(DS18B20_PIN);
DallasTemperature sensors(&oneWire);

// WiFi settings
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// Server URL
const char* serverName = "http://your-server-ip/save_data.php";

// Initialize WiFi client
WiFiClient client;

void setup() {
  Serial.begin(115200);

  // Initialize DHT sensor
  dht.begin();

  // Initialize DS18B20 sensor
  sensors.begin();

  // Initialize pins
  pinMode(FAN_IN_PIN, OUTPUT);
  pinMode(FAN_OUT_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(MQ135_PIN, INPUT);
  pinMode(DSM501A_PIN, INPUT);
  pinMode(SOLAR_PANEL_PIN, INPUT);

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to Wi-Fi");
}

void loop() {
  // Read sensor values
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  sensors.requestTemperatures();
  float outside_temp = sensors.getTempCByIndex(0); // DS18B20 sensor
  float co2 = analogRead(MQ135_PIN); // Raw value, consider calibration
  float pm25 = getPM25(); // Implement this function based on DSM501A sensor
  float solar_voltage = analogRead(SOLAR_PANEL_PIN); // Read solar panel voltage
  String sunlight_condition = mapSolarVoltageToCondition(solar_voltage);

  // Print values to Serial Monitor
  Serial.print("Temperature: "); Serial.println(temperature);
  Serial.print("Humidity: "); Serial.println(humidity);
  Serial.print("Outside Temp: "); Serial.println(outside_temp);
  Serial.print("CO2: "); Serial.println(co2);
  Serial.print("PM2.5: "); Serial.println(pm25);
  Serial.print("Solar Voltage: "); Serial.println(solar_voltage);
  Serial.print("Sunlight Condition: "); Serial.println(sunlight_condition);

  // Send data to server
  if (client.connect(serverName, 80)) {
    String postData = "temperature=" + String(temperature) +
                      "&humidity=" + String(humidity) +
                      "&outside_temp=" + String(outside_temp) +
                      "&co2=" + String(co2) +
                      "&pm25=" + String(pm25) +
                      "&solar_voltage=" + String(solar_voltage) +
                      "&sunlight_condition=" + sunlight_condition;
    client.println("POST /save_data.php HTTP/1.1");
    client.println("Host: your-server-ip");
    client.println("Content-Type: application/x-www-form-urlencoded");
    client.println("Content-Length: " + String(postData.length()));
    client.println();
    client.println(postData);
    delay(1000);
  }
  
  // Control fans and relay based on conditions
  controlFans(temperature, humidity, co2, pm25);

  // Delay between readings
  delay(60000); // 1 minute
}

void controlFans(float temperature, float humidity, float co2, float pm25) {
  // Example control logic
  if (temperature > 29) {
    analogWrite(FAN_IN_PIN, map(temperature, 29, 31, 50, 255));
    analogWrite(FAN_OUT_PIN, map(temperature, 29, 31, 50, 255));
    if (temperature > 31) {
      digitalWrite(RELAY_PIN, HIGH); // Turn on exhaust fan
    } else {
      digitalWrite(RELAY_PIN, LOW); // Turn off exhaust fan
    }
  } else {
    analogWrite(FAN_IN_PIN, 0);
    analogWrite(FAN_OUT_PIN, 0);
    digitalWrite(RELAY_PIN, LOW);
  }
}

float getPM25() {
  // Implement DSM501A sensor reading code here
  return 10.0; // Placeholder value
}

String mapSolarVoltageToCondition(float voltage) {
  // Map voltage values to sunlight conditions
  if (voltage < 1.0) {
    return "Night";
  } else if (voltage < 2.0) {
    return "Dawn/Dusk";
  } else if (voltage < 3.0) {
    return "Rainy";
  } else if (voltage < 4.0) {
    return "Cloudy";
  } else {
    return "Full Sun";
  }
}