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

// Define Pins
#define SOIL_MOISTURE_PIN 34   // Potentiometer simulates soil moisture sensor
#define BUZZER_PIN 5           // Buzzer for alerts
#define RELAY_PIN 12           // Relay controls the pump LED
#define PUMP_LED_PIN 4         // Debugging LED to check relay status

// WiFi & ThingSpeak Credentials
const int MyChannelID = 2801800;
const char* API_KEY = "4HGU4M7QZJ3UJTH9";
const char* SSID = "Wokwi-GUEST";
const char* PASS = "";

WiFiClient client;

void setup() {
  pinMode(SOIL_MOISTURE_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(PUMP_LED_PIN, OUTPUT);  // New debug LED
  
  digitalWrite(RELAY_PIN, LOW);  // Pump off initially
  digitalWrite(PUMP_LED_PIN, LOW);  // Debug LED off initially

  Serial.begin(9600);
  WiFi.begin(SSID, PASS);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
  ThingSpeak.begin(client);

  // **Relay & Debug LED Test**
  digitalWrite(RELAY_PIN, HIGH);
  digitalWrite(PUMP_LED_PIN, HIGH);
  delay(1000);
  digitalWrite(RELAY_PIN, LOW);
  digitalWrite(PUMP_LED_PIN, LOW);
}

void loop() {
  int soilMoisture = analogRead(SOIL_MOISTURE_PIN);  
  Serial.print("Soil Moisture Level: ");
  Serial.println(soilMoisture);

  if (soilMoisture < 300) {  // Adjust threshold based on real conditions
    tone(BUZZER_PIN, 262, 500);  // Short buzzer alert
    digitalWrite(RELAY_PIN, HIGH); // Turn ON pump LED
    digitalWrite(PUMP_LED_PIN, HIGH); // Turn ON debug LED
    Serial.println("⚠️ Soil is dry! Watering...");
  } else {
    noTone(BUZZER_PIN);  // Turn off buzzer
    digitalWrite(RELAY_PIN, LOW); // Turn OFF pump LED
    digitalWrite(PUMP_LED_PIN, LOW); // Turn OFF debug LED
    Serial.println("✅ Soil moisture is sufficient.");
  }

  // Send data to ThingSpeak
  ThingSpeak.setField(1, soilMoisture);
  ThingSpeak.writeFields(MyChannelID, API_KEY);

  delay(2000);  // Wait 2 seconds before checking again
}