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

// Pin and Network Configuration
const int DHT_PIN = 15;        // Pin for the DHT22 sensor
const int LED_PIN = 13;        // Pin for the alert LED
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2845653;
const char* myApiKey = "4KG3SOJ7ENDUQIOZ";

// ThingSpeak Server
const char* server = "api.thingspeak.com";

// Global Objects
DHTesp dhtSensor;
WiFiClient client;

void setup() {
  Serial.begin(115200);
  
  // DHT Sensor Initialization
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(LED_PIN, OUTPUT);

  // Connect to Wi-Fi
  Serial.println("Connecting to Wi-Fi...");
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  int retryCount = 0;
  while (WiFi.status() != WL_CONNECTED && retryCount < 20) {
    delay(1000);
    Serial.print(".");
    retryCount++;
  }
  
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nWi-Fi connected!");
    Serial.println("Local IP: " + String(WiFi.localIP()));
    WiFi.mode(WIFI_STA);
    ThingSpeak.begin(client);
  } else {
    Serial.println("\nWi-Fi connection failed. Check credentials.");
  }
}

void loop() {
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Reconnecting to Wi-Fi...");
    WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
    delay(5000);
    return;
  }

  // Read sensor data
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  if (isnan(data.temperature) || isnan(data.humidity)) {
    Serial.println("Failed to read from DHT sensor. Retrying...");
    delay(5000);
    return;
  }

  // Update ThingSpeak fields
  ThingSpeak.setField(1, data.temperature);
  ThingSpeak.setField(2, data.humidity);

  // LED Alert Logic
  if (data.temperature > 35 || data.temperature < 12 || data.humidity > 70 || data.humidity < 40) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }

  // Push data to ThingSpeak
  int statusCode = ThingSpeak.writeFields(myChannelNumber, myApiKey);
  if (statusCode == 200) {
    Serial.println("Data successfully sent to ThingSpeak!");
  } else {
    Serial.println("Failed to send data. Error code: " + String(statusCode));
  }

  // Log to Serial Monitor
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");

  // Delay for 10 seconds
  delay(10000);
}