#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; 

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

HTTPClient http; // Create http client object

// Query outlet status
void getOutletState() {   
  int outlet_state; 
  http.begin(query_url);  
  //Connection request and response status code   
  int httpCode = http.GET(); 
  Serial.printf("httpCode=%d\n", httpCode);
  if (httpCode == HTTP_CODE_OK){ 
    // Get response information
    String payload = http.getString();   
    //----------解析回應的 JSON 資料----------
    // 宣告變數儲存 JSON 資料   
    DynamicJsonDocument outlet_json(payload.length()*2);
    // payload converts JSON object
    deserializeJson(outlet_json, payload);
    //get outlet switch status
    String switch_state = outlet_json["data"]["Data"][2].as<String>(); 
    int outlet_state = switch_state.toInt();
    if (outlet_state == 1) {
      Serial.println("Outlet ON");
      digitalWrite(LED_PIN, HIGH); 
    }  
    if (outlet_state == 0){
      Serial.println("Outlet OFF");
      digitalWrite(LED_PIN, LOW);
    }      
  }  
  else {
   Serial.println("Error on HTTP request");     
  }
  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() {  
  // Read button status
  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!");        
        getOutletState();                
      }            
    }    
  }    
}