#include <DHTesp.h>
#include "WiFi.h"
#include "ThingSpeak.h"
#include <PubSubClient.h>

const int DHT_PIN = 13;
const int LED_PIN = 15;
const int WATER_LEVEL_PIN = 2;
const char* WIFI_NAME = "WoKwi-GUEST";
const char* WIFI_PASSWORD = "";
const unsigned long myChannelNumber = 2387554;
const char* myApiKey = "XVDZ1OH9RPUX4IH7";
const char* server = "api.thingspeak.com";
WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);

DHTesp dhtSensor;
int gasPin = 4;

void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT11);
  pinMode(LED_PIN, OUTPUT);
  pinMode(WATER_LEVEL_PIN, INPUT);
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Wifi not connected");
  }

  Serial.println("Wifi connected !");
  Serial.println("Local IP: " + WiFi.localIP().toString());
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(wifiClient);

  mqttClient.setServer("broker.hivemq.com", 1883);
  mqttClient.connect("ESP32Client");
}

void loop() {
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  ThingSpeak.setField(1, data.temperature);
  ThingSpeak.setField(2, data.humidity);

  int gasValue = analogRead(gasPin);
  ThingSpeak.setField(3, gasValue);

  int waterLevel = digitalRead(WATER_LEVEL_PIN);
  ThingSpeak.setField(4, waterLevel);

  if (data.temperature > 15 && data.humidity > 40) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }

  // MQTT Publish
  mqttClient.publish("data/1", String(data.temperature).c_str());
  mqttClient.publish("data/2", String(data.humidity).c_str());
  mqttClient.publish("data/3", String(gasValue).c_str());
  mqttClient.publish("data/4", String(waterLevel).c_str());

  int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);

  Serial.println("Temperature: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("Gas Value: " + String(gasValue));
  Serial.println("Water Level: " + String(waterLevel));
  Serial.println("Gas: " + String(gasValue, 2) + "bar");

  if (x == 200) {
    Serial.println("Data pushed successfully");
  } else {
    Serial.println("Push error: " + String(x));
  }
  Serial.println("---");

  delay(10000);
}