#define BLYNK_TEMPLATE_ID "TMPL3Q9Fx6F5T"
#define BLYNK_TEMPLATE_NAME "Smart Agriculture"
#define BLYNK_AUTH_TOKEN "CmKpgh_S01IS1lC7nsSltnhsJd1fkgRt"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

#define MOISTURE_PIN 34
#define NUTRIENT_PIN 35
#define RELAY_PIN 26
#define STATUS_LED 25
#define FERT_LED 27
#define BUTTON_PIN 14

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

bool autoMode = true;

int moistureThreshold = 2500;
int nutrientThreshold = 2500;

String apiKey = "NQGKD7KFMW02V3TG";
const char* server = "api.thingspeak.com";

WiFiClient client;
BlynkTimer timer;

// ---------------- BLYNK CONTROLS ----------------

BLYNK_WRITE(V2) { // Relay control (manual)
  if (!autoMode) {
    int state = param.asInt();
    digitalWrite(RELAY_PIN, state);
  }
}

BLYNK_WRITE(V3) { // Mode switch
  autoMode = param.asInt() == 0 ? true : false;
}

// ---------------- SENSOR + LOGIC ----------------

void sendData() {

  int moisture = analogRead(MOISTURE_PIN);
  int nutrient = analogRead(NUTRIENT_PIN);

  int moisturePercent = map(moisture, 0, 4095, 100, 0);

  Serial.println("------ SENSOR DATA ------");
  Serial.println(moisture);
  Serial.println(nutrient);

  // -------- AUTO MODE --------
  if (autoMode) {

    if (moisture < moistureThreshold) {
      digitalWrite(RELAY_PIN, HIGH);
      digitalWrite(STATUS_LED, HIGH);
    } else {
      digitalWrite(RELAY_PIN, LOW);
      digitalWrite(STATUS_LED, LOW);
    }

    if (nutrient < nutrientThreshold) {
      digitalWrite(FERT_LED, HIGH);
      Blynk.virtualWrite(V4, 255);
    } else {
      digitalWrite(FERT_LED, LOW);
      Blynk.virtualWrite(V4, 0);
    }

  }

  // -------- BLYNK UPDATE --------
  Blynk.virtualWrite(V0, moisturePercent);
  Blynk.virtualWrite(V1, nutrient);
  Blynk.virtualWrite(V5, digitalRead(STATUS_LED));

  // -------- THINGSPEAK --------
  if (client.connect(server, 80)) {
    String url = "/update?api_key=" + apiKey;
    url += "&field1=" + String(moisture);
    url += "&field2=" + String(nutrient);

    client.print(String("GET ") + url + " HTTP/1.1\r\n" +
                 "Host: " + server + "\r\n" +
                 "Connection: close\r\n\r\n");

    client.stop();
  }
}

// ---------------- SETUP ----------------

void setup() {
  Serial.begin(115200);

  pinMode(RELAY_PIN, OUTPUT);
  pinMode(STATUS_LED, OUTPUT);
  pinMode(FERT_LED, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  timer.setInterval(2000L, sendData); // every 2 sec
}

// ---------------- LOOP ----------------

void loop() {
  Blynk.run();
  timer.run();

  // Physical button toggle
  if (digitalRead(BUTTON_PIN) == LOW) {
    autoMode = !autoMode;
    delay(300);
  }
}