/*
ESP32 Web Control with Serial Feedback
---------------------------------------
- Accepts:   /set?led=0/1&buzzer=0/1
- Controls:  LED = GPIO 21
             Buzzer = GPIO 22
- Prints live ON/OFF status in Serial Monitor
*/

#include <WiFi.h>
#include <WebServer.h>

const char* STA_SSID = "Wokwi-GUEST"; 
const char* STA_PASS = "";

const int PIN_LED = 21;
const int PIN_BUZZER = 22;

WebServer server(80);

void printStatus() {
  Serial.print("LED: ");
  Serial.print(digitalRead(PIN_LED) ? "ON" : "OFF");
  Serial.print(" | BUZZER: ");
  Serial.println(digitalRead(PIN_BUZZER) ? "ON" : "OFF");
}

void handleRoot() {
  server.send(200, "text/html", "<h3>ESP32 Online</h3>");
}

void handleSet() {
  Serial.println("----- REQUEST RECEIVED -----");

  String ledStr = server.arg("led");
  String buzStr = server.arg("buzzer");

  Serial.print("Query: led=");
  Serial.print(ledStr);
  Serial.print(" buzzer=");
  Serial.println(buzStr);

  if (ledStr == "1") { 
    digitalWrite(PIN_LED, HIGH);
    Serial.println("LED → ON");
  } 
  else if (ledStr == "0") { 
    digitalWrite(PIN_LED, LOW);
    Serial.println("LED → OFF");
  }

  if (buzStr == "1") { 
    digitalWrite(PIN_BUZZER, HIGH);
    Serial.println("BUZZER → ON");
  } 
  else if (buzStr == "0") { 
    digitalWrite(PIN_BUZZER, LOW);
    Serial.println("BUZZER → OFF");
  }

  printStatus();
  Serial.println("----------------------------\n");

  String response = "{";
  response += "\"led\":";
  response += (digitalRead(PIN_LED) ? "1" : "0");
  response += ",\"buzzer\":";
  response += (digitalRead(PIN_BUZZER) ? "1" : "0");
  response += "}";

  server.send(200, "application/json", response);
}

void setupServer() {
  server.on("/", HTTP_GET, handleRoot);
  server.on("/set", HTTP_GET, handleSet);
  server.begin();
  Serial.println("✔ HTTP Server Started");
}

void setup() {
  Serial.begin(115200);
  Serial.println("\nBooting ESP32...");

  pinMode(PIN_LED, OUTPUT);
  pinMode(PIN_BUZZER, OUTPUT);
  digitalWrite(PIN_LED, LOW);
  digitalWrite(PIN_BUZZER, LOW);

  WiFi.mode(WIFI_STA);
  WiFi.begin(STA_SSID, STA_PASS);

  Serial.print("Connecting to WiFi: ");
  Serial.println(STA_SSID);

  unsigned long startAttempt = millis();
  while (WiFi.status() != WL_CONNECTED && millis() - startAttempt < 6000) {
    Serial.print(".");
    delay(300);
  }

  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\n✔ Connected to Wokwi-GUEST");
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());
  } else {
    Serial.println("\n❌ STA Failed — Starting SoftAP...");
    WiFi.mode(WIFI_AP);
    WiFi.softAP("ESP32_AP", "wokwi1234");

    Serial.print("SoftAP IP: ");
    Serial.println(WiFi.softAPIP());
  }

  setupServer();
}

void loop() {
  server.handleClient();
}