#include <WiFi.h>
#include <HTTPClient.h>

// WiFi & ThingSpeak Details
const char* ssid = "vivo V23 5G";  // WiFi SSID
const char* password = "";         // WiFi Password (leave empty if none)
const char* server = "http://api.thingspeak.com/update";  // ThingSpeak API URL
String apiKey = "9WXKR5GNJSCW7S6J";  // Your ThingSpeak API key

// Serial Communication with Arduino (UART2)
#define RX2_PIN 16  // RX2 (Arduino TX to ESP32 RX)
#define TX2_PIN 17  // TX2 (Arduino RX to ESP32 TX)

void setup() {
    Serial.begin(115200); // Start serial communication at 115200 baudrate
    Serial2.begin(115200, SERIAL_8N1, RX2_PIN, TX2_PIN);  // Start serial2 with baudrate 115200

    // Connect to WiFi
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.println("Connecting to WiFi...");
    }
    Serial.println("Connected to WiFi");
}

void loop() {
    // Check if there's data available from the Arduino
    if (Serial2.available()) {
        String data = Serial2.readStringUntil('\n');  // Read data till newline
        data.trim();  // Remove any leading/trailing spaces

        // Parse the data using commas as delimiters
        int firstComma = data.indexOf(',');
        int secondComma = data.indexOf(',', firstComma + 1);
        int thirdComma = data.indexOf(',', secondComma + 1);

        if (firstComma > 0 && secondComma > firstComma && thirdComma > secondComma) {
            // Extract each sensor value based on commas
            String temperature = data.substring(0, firstComma);
            String humidity = data.substring(firstComma + 1, secondComma);
            String airQuality = data.substring(secondComma + 1, thirdComma);
            String soilMoisture = data.substring(thirdComma + 1);

            // Print out the data before sending it to ThingSpeak
            Serial.println("Sending data to ThingSpeak...");
            Serial.println("Temperature: " + temperature);
            Serial.println("Humidity: " + humidity);
            Serial.println("Air Quality: " + airQuality);
            Serial.println("Soil Moisture: " + soilMoisture);

            // Send data to ThingSpeak if WiFi is connected
            if (WiFi.status() == WL_CONNECTED) {
                HTTPClient http;  // Create HTTPClient object
                String url = String(server) + "?api_key=" + apiKey +
                             "&field1=" + temperature +
                             "&field2=" + humidity +
                             "&field3=" + airQuality +
                             "&field4=" + soilMoisture;

                http.begin(url);  // Begin HTTP request
                int httpResponseCode = http.GET();  // Make GET request to ThingSpeak

                // Check the HTTP response code
                if (httpResponseCode > 0) {
                    Serial.println("Data Sent Successfully!");
                } else {
                    Serial.print("Error: ");
                    Serial.println(httpResponseCode);  // Print the error code if failure
                }
                http.end();  // End HTTP request
            }
        }
    }

    delay(2000);  // Delay of 2 seconds before sending the next data
}