#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <WiFi.h>
#include <WebServer.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const char* ssid = "Wokwi-Test";  // WiFi จำลองของ Wokwi
const char* password = "";

WebServer server(80);

void handleCommand() {
  if (server.hasArg("cmd")) {
    String command = server.arg("cmd");
    String response = "{\"status\":\"OK\",\"command\":\"" + command + "\"}";  // ส่ง JSON
    server.send(200, "application/json", response);  // ส่งข้อมูลเป็น JSON
  } else {
    server.send(400, "application/json", "{\"status\":\"ERROR\",\"message\":\"No command received\"}");
  }
}

void setup() {
    Serial.begin(115200);
    Wire.begin();
    // Connect WiFi
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }
    Serial.println("\nConnected to WiFi!");
    server.on("/", []() {
      server.send(200, "text/html", "<h1>ESP32 Web Server</h1><p>Use /command?cmd=OPEN or CLOSE</p>");
    });
    server.on("/command", handleCommand);  // ตั้งค่าการส่งคำสั่ง
    server.begin();

    if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
        Serial.println("SSD1306 allocation failed");
        while (1);
    }

    display.clearDisplay();
}

void loop() {
    server.handleClient();  // รอรับ HTTP Request
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(WHITE);
    display.setCursor(0, 10);
    display.print("Web Server Running");
    display.setCursor(0, 30);
    display.print("Use /command?cmd=OPEN");
    display.display();
    delay(1000);
}