#include <OneWire.h>
#include <DallasTemperature.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <time.h>

// ======================= CONFIG WI-FI =======================
#define WIFI_SSID       "Wokwi-GUEST"
#define WIFI_PASSWORD   ""

// ======================= CONFIG FIREBASE ====================
#define DATABASE_URL     "https://buoy-4f252-default-rtdb.asia-southeast1.firebasedatabase.app"
#define DB_SECRET        "hDMIteIWu5ev3TkPFiGSh1vazuBxK7WFWv67qQRB"

// ====================== PIN DEFINITIONS ======================
const int ONE_WIRE_PIN = 15; // DS18B20
const int LDR_PIN      = 34; // LDR analog

// =================== SENSOR INITIALIZATION ===================
OneWire oneWire(ONE_WIRE_PIN);
DallasTemperature sensors(&oneWire);

// =================== NTP CONFIG (WIB = GMT+7) ===================
const long GMT_OFFSET     = 7 * 3600;
const int  DAYLIGHT_SHIFT = 0;

// --------------------------------------------------------------
// Initialize NTP Time
// --------------------------------------------------------------
void initTime()
{
    Serial.println("Sinkronisasi waktu melalui NTP...");
    configTime(GMT_OFFSET, DAYLIGHT_SHIFT, "pool.ntp.org", "id.pool.ntp.org");

    // Menunggu sampai waktu tersinkron
    while (time(nullptr) < 100000)
    {
        Serial.print(".");
        delay(500);
    }

    Serial.println("\nWaktu berhasil tersinkron!");
}

// --------------------------------------------------------------
// Generate timestamp WIB dalam format: YYYY-MM-DD HH:MM:SS
// --------------------------------------------------------------
String getTimestamp()
{
    time_t now = time(nullptr);
    struct tm* ti = localtime(&now);

    char buffer[25];
    strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", ti);

    return String(buffer);
}

// --------------------------------------------------------------
// Kirim ke Firebase (temperature, light, timestamp WIB saja)
// --------------------------------------------------------------
void sendToFirebase(float suhu, int ldrValue)
{
    if (WiFi.status() != WL_CONNECTED)
    {
        Serial.println("WiFi tidak terhubung. Data tidak dikirim.");
        return;
    }

    HTTPClient http;

    String url = String(DATABASE_URL) + "/sensorLogs.json?auth=" + DB_SECRET;

    http.begin(url);
    http.addHeader("Content-Type", "application/json");

    // Waktu lokal WIB
    String timestamp = getTimestamp();

    // JSON body
    String json = "{";
    json += "\"temperature\": " + String(suhu) + ",";
    json += "\"light\": " + String(ldrValue) + ",";
    json += "\"timestamp\": \"" + timestamp + "\"";
    json += "}";

    int res = http.POST(json);

    Serial.println("Firebase POST Code: " + String(res));
    if (res > 0)
        Serial.println("Response: " + http.getString());
    else
        Serial.println("Gagal mengirim data!");

    http.end();
}

// ================================ SETUP ================================
void setup()
{
    Serial.begin(115200);
    delay(500);

    // ---------------------- Wi-Fi -----------------------
    Serial.println("Menghubungkan ke WiFi...");
    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

    while (WiFi.status() != WL_CONNECTED)
    {
        Serial.print(".");
        delay(500);
    }

    Serial.println("\nWiFi Terhubung!");
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());

    // ---------------------- NTP Init ---------------------
    initTime();

    // ---------------------- Sensor Init ------------------
    sensors.begin();

    Serial.println("=== Sistem Sensor + Firebase Siap ===");
}

// ================================ LOOP ================================
void loop()
{
    // ---- 1. Baca suhu ----
    sensors.requestTemperatures();
    float suhu = sensors.getTempCByIndex(0);

    // ---- 2. Baca LDR ----
    int nilaiLDR = analogRead(LDR_PIN);

    // ---- 3. Debug Serial ----
    Serial.println("--------------------------------");
    Serial.println("Waktu WIB     : " + getTimestamp());
    Serial.println("Suhu Air      : " + String(suhu) + " °C");
    Serial.println("Nilai LDR     : " + String(nilaiLDR));
    Serial.println("Mengirim ke Firebase...");

    // ---- 4. Kirim ke Firebase ----
    sendToFirebase(suhu, nilaiLDR);

    delay(2000);
}