#define BLYNK_TEMPLATE_ID "TMPL6B8kHHDtY"
#define BLYNK_TEMPLATE_NAME "Smart Irrigation"
#define BLYNK_AUTH_TOKEN "QnAZ5yk1d3JXt4qbPLNgGPeLvfDXs25J"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>

// Wokwi uses this special WiFi network (no password needed)
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Pin definitions
#define SOIL_PIN     34    // Potentiometer middle pin → simulates soil moisture
#define DHT_PIN      4     // DHT22 data pin
#define PUMP_PIN     5     // LED → simulates water pump/relay
#define DHT_TYPE     DHT22

// Irrigation settings
const float MOISTURE_THRESHOLD = 40.0;  // Water if soil moisture < 40%

DHT dht(DHT_PIN, DHT_TYPE);
bool manualOverride = false;  // Controlled by Blynk switch

// Blynk virtual pin V5 = Manual Override Switch
BLYNK_WRITE(V5) {
  manualOverride = param.asInt();  // 1 = ON, 0 = OFF
  digitalWrite(PUMP_PIN, manualOverride ? HIGH : LOW);
  Blynk.virtualWrite(V3, manualOverride ? 1 : 0);  // Update pump status
}

void setup() {
  Serial.begin(115200);
  Serial.println("Smart Irrigation Prototype Starting...");

  pinMode(PUMP_PIN, OUTPUT);
  digitalWrite(PUMP_PIN, LOW);  // Pump off initially

  dht.begin();

  // Connect to Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  Serial.println("Connecting to Blynk...");
}

void loop() {
  Blynk.run();  // Keep Blynk connection alive

  // Read sensors
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Read soil moisture simulation (0-4095 → map to 0-100%)
  int soilRaw = analogRead(SOIL_PIN);
  float soilMoisture = map(soilRaw, 4095, 1700, 0, 100);  // Adjust calibration if needed
  soilMoisture = constrain(soilMoisture, 0, 100);

  // Automatic logic (only if not manually overridden)
  bool autoPump = (soilMoisture < MOISTURE_THRESHOLD);
  bool pumpOn = manualOverride || autoPump;

  // Control the virtual pump (LED)
  digitalWrite(PUMP_PIN, pumpOn ? HIGH : LOW);

  // Send data to Blynk dashboard
  Blynk.virtualWrite(V0, soilMoisture);      // Soil Moisture %
  Blynk.virtualWrite(V1, temperature);       // Temperature °C
  Blynk.virtualWrite(V2, humidity);          // Humidity %
  Blynk.virtualWrite(V3, pumpOn ? 1 : 0);     // Pump Status (1=ON, 0=OFF)

  // Print to Serial Monitor (useful for debugging)
  Serial.printf("Soil: %.1f%% | Temp: %.1f°C | Hum: %.1f%% | Pump: %s | Manual: %s\n",
                soilMoisture, temperature, humidity,
                pumpOn ? "ON " : "OFF",
                manualOverride ? "YES" : "NO ");

  delay(1000);  // Update every 5 seconds
}