#include <WiFi.h>
#include <HTTPClient.h>
#include "DHT.h"

#define DHTPIN 15       // GPIO ของ DHT22
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

// WiFi จำลองใน Wokwi
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// URL ngrok ของคุณ
String webhookURL = "https://webhook.site/025425c5-aa1b-40d8-8e9b-40914dbd57f4";
// String webhookURL = "https://1bb90d00f52b.ngrok-free.app/dewgasohol_beta/sensor_insert.php";

// เก็บค่าล่าสุด
float lastTemp = NAN;
float lastHum  = NAN;

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

  // เชื่อมต่อ WiFi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\n✅ WiFi connected");
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  if (isnan(h) || isnan(t)) {
    Serial.println("❌ Failed to read from DHT sensor!");
    delay(2000);
    return;
  }

  bool needSend = false;

  // ส่งครั้งแรกหรือค่ามีการเปลี่ยนแปลง
  if (isnan(lastTemp) || isnan(lastHum) || fabs(t - lastTemp) >= 0.5 || fabs(h - lastHum) >= 2.0) {
    needSend = true;
  }

  if (needSend) {
    Serial.printf("📤 Sending: Temp=%.1f, Hum=%.1f\n", t, h);

    if (WiFi.status() == WL_CONNECTED) {
      HTTPClient http;
      http.begin(webhookURL);
      http.addHeader("Content-Type", "application/json");

      // JSON payload แบบ Vue.js
      String jsonData = "{\"temperature\": " + String(t, 1) + 
                        ", \"humidity\": " + String(h, 1) + "}";

      int httpResponseCode = http.POST(jsonData);

      if (httpResponseCode > 0) {
        String response = http.getString();
        Serial.printf("✅ Sent successfully: %d\n", httpResponseCode);
        Serial.println("📄 Response from server: " + response);

        // อ่าน success และ error
        if (response.indexOf("\"success\":true") >= 0) {
          Serial.println("🎉 Server reported success!");
          // แสดง ID ถ้ามี
          int idIndex = response.indexOf("\"id\":");
          if (idIndex >= 0) {
            String idStr = response.substring(idIndex + 5);
            int comma = idStr.indexOf(",");
            if (comma > 0) idStr = idStr.substring(0, comma);
            idStr.trim();
            Serial.println("🆔 Inserted ID: " + idStr);
          }
        } else {
          Serial.println("❌ Server reported failure");
        }

      } else {
        Serial.printf("❌ Failed to send: %s\n", http.errorToString(httpResponseCode).c_str());
      }

      http.end();
    } else {
      Serial.println("❌ WiFi not connected");
    }

    lastTemp = t;
    lastHum  = h;
  } else {
    Serial.println("ℹ️ No significant change, not sending");
  }

  delay(2000);
}