#include "WiFi.h"
#include "HTTPClient.h"
#include "ArduinoJson.h"

// Outlet information
String deviceSN = "10796572";
String api_key = "ADu2FL4V7LdfprFNL9xpKkbVw873";
String query_url = "http://service.wf8266.com/api/mqtt/" + \
  deviceSN + "/RequestState/" + api_key; 
String switch_off_url = "http://service.wf8266.com/api/mqtt/" + \
  deviceSN + "/GPIO/" + api_key + "/12,0";
String switch_on_url = "http://service.wf8266.com/api/mqtt/" + \
  deviceSN + "/GPIO/" + api_key + "/12,1"; 

const int BUTTON_PIN = 15;  // Button Pin
const int LED_PIN = 2; 
// The button state is initialized to not pressed
int lastButtonState = HIGH; 
int ledState = LOW; // LED initial state

HTTPClient http; // Create http client object

// Request outlet switching
void switchOutlet(String switch_url, int ledState) {
  bool success = false;
  HTTPClient http; 
  while (!success){ 
    http.begin(switch_url);   
    //Connection request and response status code   
    int httpCode = http.GET(); 
    Serial.printf("httpCode=%d\n", httpCode); 
    if (httpCode == HTTP_CODE_OK){ 
      digitalWrite(LED_PIN, !ledState);
      Serial.println("Outlet already switched");    
      success = true;
    }
    else {
     Serial.println("Error on HTTP request");  
     delay(5000); // 等待 2 秒後重試   
    }
    http.end(); // Connection end
  }
}

void setup() {
  Serial.begin(115200);   
  pinMode(LED_PIN, OUTPUT); 
  digitalWrite(LED_PIN, LOW);
  pinMode(BUTTON_PIN, INPUT_PULLUP); 
  // setup WiFi
  Serial.println("Initializing WiFi ...");
  WiFi.mode(WIFI_STA);
  WiFi.disconnect(); // 無線初始化
  Serial.print("Connecting to WiFi ");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }  
  Serial.print(" connected!");    
  Serial.println("");  
}

void loop() {   
  int reading = digitalRead(BUTTON_PIN);  
  //If the button state changes
  if (reading != lastButtonState) {
    // 延遲50毫秒以過濾按鈕彈跳
    delay(50);
    // 再次讀取按鈕狀態，確認是否穩定
    reading = digitalRead(BUTTON_PIN);
    // 如果按鈕確實發生變化
    if (reading != lastButtonState) {
      // 更新按鈕狀態
      lastButtonState = reading;
      // 當按鈕被按下（狀態從高變低）時切換 LED
      if (reading == LOW) {        
        Serial.println("Button pressed!"); 
        int ledState = digitalRead(LED_PIN);
        if (ledState == 0){
          switchOutlet(switch_on_url, ledState);   
        } 
        else if (ledState == 1){
          switchOutlet(switch_off_url, ledState);   
        }                    
      }            
    }    
  }    
}