/*
  Proyek      : IoT Pengukur Kelembaban Tanah & Penyiram Otomatis
  Board       : Wemos D1 Mini (ESP8266)
  Integrasi   : Blynk IoT & WhatsApp API Fonnte
*/

// --- BLYNK CREDENTIALS (HARUS DI PALING ATAS) ---
#define BLYNK_TEMPLATE_ID "TMPL6xTjYZOFa"   // Ganti dengan Template ID Blynk
#define BLYNK_TEMPLATE_NAME "Smart Farming"   // Ganti dengan Template Name Blynk
#define BLYNK_AUTH_TOKEN "fzPEGMjL7ZE2kWebrpYC-oqhTThRqdzT";   // Ganti dengan token Blynk

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <LiquidCrystal_I2C.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClientSecure.h>

// --- KONFIGURASI WIFI ---
char ssid[] = "NAMA_WIFI_ANDA";       // Ganti dengan nama WiFi Anda
char pass[] = "PASSWORD_WIFI_ANDA";   // Ganti dengan password WiFi Anda

// --- KONFIGURASI FONNTE WA ---
String fonnteToken = "xxxxxxxxxx";   // Ganti dengan Token API WA
String targetWA = "08xxxxxxxxxxxxxx";   // Ganti dengan no WA Tujuan

// --- KONFIGURASI PIN & HARDWARE ---
#define SENSOR_PIN A0
#define RELAY_PIN D7   // Pin D7 terhubung ke Relay Pompa

// Jika relay Anda aktif LOW (nyala saat diberi logika LOW), ubah nilai di bawah ini:
// PUMP_ON = LOW, PUMP_OFF = HIGH
#define PUMP_ON LOW
#define PUMP_OFF HIGH

LiquidCrystal_I2C lcd(0x27, 16, 2); // Alamat I2C biasanya 0x27 atau 0x3F
BlynkTimer timer;

// --- VARIABEL GLOBAL ---
int moisturePercent = 0;
bool isAutoMode = true;   // Default mode Auto
bool isPumpOn = false;
bool waSent = false;      // Mencegah spam WA (Hanya dikirim sekali saat mulai kering)

// Batas kelembaban (Sesuai permintaan: Kering < 25%, Basah >= 80%)
const int DRY_THRESHOLD = 25; 
const int WET_THRESHOLD = 80; 

void setup() {
  Serial.begin(115200);
  
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, PUMP_OFF); // Pastikan pompa mati saat awal

  // Inisialisasi LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Memulai Sistem..");
  
  // Inisialisasi Blynk & WiFi
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("WiFi Terhubung!");
  delay(1000);

  // Set interval pembacaan sensor setiap 2 detik
  timer.setInterval(2000L, processSensor);
  
  // Set default state Blynk
  Blynk.virtualWrite(V2, 0); // Set ke Mode Auto
  Blynk.virtualWrite(V3, 0); // Matikan tombol manual
}

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

// --- FUNGSI PEMBACAAN SENSOR & LOGIKA AUTO ---
void processSensor() {
  int sensorValue = analogRead(SENSOR_PIN);
  
  // Berdasarkan pengujian, nilai analog basah maksimal sensor ada di kisaran 750.
  moisturePercent = map(sensorValue, 1023, 750, 0, 100); 
  
  // Batasi nilai persentase agar tidak tembus 0-100
  if (moisturePercent > 100) moisturePercent = 100;
  if (moisturePercent < 0) moisturePercent = 0;

  Serial.print("Kelembaban: ");
  Serial.print(moisturePercent);
  Serial.println("%");

  // Update ke Blynk dan LCD
  Blynk.virtualWrite(V0, moisturePercent);
  updateLCD();

  // Logika Mode Otomatis
  if (isAutoMode) {
    if (moisturePercent < DRY_THRESHOLD && !isPumpOn) {
      // Tanah Kering -> Nyalakan Pompa
      turnPump(true);
      Blynk.virtualWrite(V1, "Kering - Menyiram");
      
      // Kirim WA hanya sekali saat baru terdeteksi kering
      if (!waSent) {
        sendWA("Peringatan: Tanah kering (" + String(moisturePercent) + "%). Pompa air sedang menyiram tanaman.");
        waSent = true; 
      }
    } 
    else if (moisturePercent >= WET_THRESHOLD && isPumpOn) {
      // Tanah Basah Cukup -> Matikan Pompa
      turnPump(false);
      Blynk.virtualWrite(V1, "Tanah Basah - OK");
      
      // Reset flag WA agar bisa mengirim lagi jika nanti kering
      waSent = false;
      sendWA("Info: Kelembaban tanah sudah cukup (" + String(moisturePercent) + "%). Pompa dimatikan.");
    }
    else if (!isPumpOn) {
      Blynk.virtualWrite(V1, "Normal");
      waSent = false; // Reset jika status normal tapi belum basah maksimal
    }
  }
}

// --- FUNGSI KONTROL POMPA ---
void turnPump(bool state) {
  isPumpOn = state;
  if (state) {
    digitalWrite(RELAY_PIN, PUMP_ON);
    Blynk.virtualWrite(V3, 1); // Update tombol di Blynk
    Serial.println("Pompa MENYALA");
  } else {
    digitalWrite(RELAY_PIN, PUMP_OFF);
    Blynk.virtualWrite(V3, 0); // Update tombol di Blynk
    Serial.println("Pompa MATI");
  }
}

// --- FUNGSI UPDATE TAMPILAN LCD ---
void updateLCD() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Lembab: ");
  lcd.print(moisturePercent);
  lcd.print("%");

  lcd.setCursor(0, 1);
  if (isPumpOn) {
    lcd.print("Pompa:NYALA");
  } else {
    lcd.print("Pompa:MATI ");
  }
  
  if (isAutoMode) {
    lcd.print("(OTO)");
  } else {
    lcd.print("(MAN)");
  }
}

// --- BLYNK VIRTUAL WRITE (MENERIMA INPUT DARI APLIKASI) ---

// Mode Switch (V2)
BLYNK_WRITE(V2) {
  int mode = param.asInt();
  if (mode == 1) {
    isAutoMode = false; // Mode Manual
    Blynk.virtualWrite(V1, "Mode: MANUAL");
  } else {
    isAutoMode = true;  // Mode Auto
    waSent = false;     // Reset flag WA saat kembali ke auto
  }
  updateLCD();
}

// Manual Pump Control Switch (V3)
BLYNK_WRITE(V3) {
  int pumpControl = param.asInt();
  
  if (!isAutoMode) {
    if (pumpControl == 1) {
      turnPump(true);
      Blynk.virtualWrite(V1, "Manual: Menyiram");
    } else {
      turnPump(false);
      Blynk.virtualWrite(V1, "Manual: Siaga");
    }
    updateLCD();
  } else {
    // Jika masih mode Auto tapi user mencoba tekan tombol pompa,
    // kembalikan tombol ke state aslinya (ditolak)
    Blynk.virtualWrite(V3, isPumpOn ? 1 : 0);
  }
}

// --- FUNGSI KIRIM WHATSAPP VIA FONNTE ---
void sendWA(String message) {
  if (WiFi.status() == WL_CONNECTED) {
    WiFiClientSecure client;
    client.setInsecure(); // Abaikan SSL untuk ESP8266 agar tidak berat
    HTTPClient http;

    Serial.println("Mengirim WA...");
    
    // Ganti spasi dengan %20 untuk format URL (URL Encoding sederhana)
    message.replace(" ", "%20");
    
    http.begin(client, "https://api.fonnte.com/send");
    http.addHeader("Authorization", fonnteToken);
    http.addHeader("Content-Type", "application/x-www-form-urlencoded");

    String postData = "target=" + targetWA + "&message=" + message;
    
    int httpResponseCode = http.POST(postData);

    if (httpResponseCode > 0) {
      Serial.print("WA Terkirim. Kode: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.print("Gagal kirim WA. Kesalahan: ");
      Serial.println(httpResponseCode);
    }
    http.end();
  } else {
    Serial.println("WiFi terputus, gagal kirim WA.");
  }
}