// Define Blynk details
#define BLYNK_TEMPLATE_ID "TMPL6I5pKHSyT"
#define BLYNK_TEMPLATE_NAME "Smart Plant Care And Watering System"
#define BLYNK_AUTH_TOKEN "h3RgVnW-JYt7ijtboJaUiNR-a7y2-HxO"

// Include libraries
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>  // Blynk library
#include <HTTPClient.h>
#include "ThingSpeak.h"

// Define pins
#define SOIL_MOISTURE_PIN 34   // Soil moisture sensor pin
#define BUZZER_PIN 5           // Buzzer pin
#define RELAY_PIN 12           // Relay pin for pump

// WiFi credentials
const char* SSID = "Wokwi-GUEST";  // WiFi SSID
const char* PASS = "";             // WiFi password (empty for Wokwi guest network)

// ThingSpeak details
const int MyChannelID = 2827198;  
const char* API_KEY = "PSS20CYIZPIDALRC";

WiFiClient client;
bool systemOn = false;
int buzzerVolume = 255; // Buzzer volume (0-255)

void setup() {
  pinMode(SOIL_MOISTURE_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);  // Ensure pump is off initially

  Serial.begin(9600);

  // Connect to WiFi
  WiFi.begin(SSID, PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi.");

  // Initialize ThingSpeak
  ThingSpeak.begin(client);

  // Connect to Blynk
  Blynk.config(BLYNK_AUTH_TOKEN);
  Blynk.connect();
}

void loop() {
  Blynk.run();  // Handle Blynk communication

  if (!systemOn) {
    digitalWrite(RELAY_PIN, LOW);
    noTone(BUZZER_PIN);
    Blynk.virtualWrite(V1, 0);  // Update pump button (OFF)
    Blynk.virtualWrite(V2, 0);  // Update buzzer button (OFF)
    Serial.println("System OFF: Pump and Buzzer are OFF");
    return;
  }

  int soilMoisture = analogRead(SOIL_MOISTURE_PIN);
  int moisturePercentage = map(soilMoisture, 0, 4095, 0, 100);  // Convert to percentage
  Serial.print("Soil Moisture Level: ");
  Serial.println(moisturePercentage);

  // Send soil moisture data to Blynk (using virtual pin V0)
  Blynk.virtualWrite(V0, moisturePercentage);

  // Check soil moisture level and control buzzer/pump
  if (moisturePercentage < 30) {  // If soil is dry (threshold can be adjusted)
    tone(BUZZER_PIN, 262, buzzerVolume);
    digitalWrite(RELAY_PIN, HIGH);  
    Serial.println("Watering the plant...");
    Blynk.virtualWrite(V1, 1);  // Update pump button (ON)
    Blynk.virtualWrite(V2, 1);  // Update buzzer button (ON)
    Blynk.logEvent("low_moisture", "Soil is too dry! Watering the plant...");
  } 
  else if (moisturePercentage > 70) {  // If soil moisture is too high (overwatered)
    tone(BUZZER_PIN, 523, buzzerVolume);
    digitalWrite(RELAY_PIN, LOW);
    Serial.println("Warning: Overwatering! Soil moisture is too high.");
    Blynk.virtualWrite(V1, 0);  // Update pump button (OFF)
    Blynk.virtualWrite(V2, 0);  // Update buzzer button (OFF)
    Blynk.logEvent("high_moisture", "Soil is overwatered! Pump stopped.");
  } 
  else {
    noTone(BUZZER_PIN);
    digitalWrite(RELAY_PIN, LOW);
    Blynk.virtualWrite(V1, 0);  // Update pump button (OFF)
    Blynk.virtualWrite(V2, 0);  // Update buzzer button (OFF)
    Serial.println("Soil moisture is ideal. No action needed.");
  }

  // Send soil moisture data to ThingSpeak
  ThingSpeak.setField(1, moisturePercentage);
  int statusCode = ThingSpeak.writeFields(MyChannelID, API_KEY);
  if (statusCode == 200) {
    Serial.println("Data sent to ThingSpeak successfully!");
  } else {
    Serial.print("Failed to send data to ThingSpeak. Error code: ");
    Serial.println(statusCode);
  }

  delay(2000);
}

// Blynk virtual pin handlers
BLYNK_WRITE(V3) {  // System On/Off button
  systemOn = param.asInt();  // Get the value of the system on/off switch (1 = ON, 0 = OFF)
  if (systemOn) {
    Serial.println("System ON");
  } else {
    Serial.println("System OFF");
  }
}

BLYNK_WRITE(V4) {  // Buzzer Volume Control (Slider)
  buzzerVolume = param.asInt();  // Get the buzzer volume from the slider (0-255)
  Serial.print("Buzzer volume set to: ");
  Serial.println(buzzerVolume);
}