#define ADDTOCAR (1 << 0)
#define PURCHASE (1 << 1)
#define PAYMENT (1 << 2)
#define BUTTONPIN 23

EventGroupHandle_t xCreatedEventGroup;
const TickType_t timeout = 1000 / portTICK_PERIOD_MS;

void AddTOCAR(void *pvParams){

  pinMode(BUTTONPIN, INPUT);
  EventBits_t uxbit;

  while(1){

    if(digitalRead(BUTTONPIN) == LOW){
      Serial.println("加入購物車!");
      uxbit = xEventGroupSetBits(xCreatedEventGroup,ADDTOCAR);
      Serial.print("event group value");
      Serial.println(uxbit,BIN);
      vTaskDelay(150);
      xTaskCreate(PurchaseTask,"PurchaseTask",10240,NULL,1,NULL);
      vTaskDelay(150);
    }

  }
}

void PurchaseTask(void *pvParams){
  EventBits_t uxbit;
  
  while(1){
    uxbit = xEventGroupWaitBits(xCreatedEventGroup,
                                ADDTOCAR,
                                pdFALSE,
                                pdFALSE,
                                timeout);
    if(uxbit & ADDTOCAR){
      Serial.println("確認購買清單，準備付款!");
      uxbit = xEventGroupSetBits(xCreatedEventGroup,PURCHASE);
      Serial.print("event group value");
      Serial.println(uxbit,BIN);
      vTaskDelay(150);
      vTaskDelete(NULL);
    }
  }
}

void PaymentTask(void *pvParams){
  EventBits_t uxbit;
  while(1){
    uxbit = xEventGroupWaitBits(xCreatedEventGroup,
                                PURCHASE,
                                pdFALSE,
                                pdFALSE,
                                timeout);
    if(uxbit & PURCHASE){
      Serial.println("已付款，準備寄送"));
      uxbit = xEventGroupSetBits(xCreatedEventGroup,PAYMENT);
      Serial.print("event group value");
      Serial.println(uxbit,BIN);
      vTaskDelay(150);
      vTaskDelete(NULL);

    }
    
  }
}


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  xCreatedEventGroup = xEventGroupCreate();
  if(xCreatedEventGroup == NULL){
    Serial.println("there was insufficient FreeRTOS heap available.");
  }
  else{
    Serial.println("Successed created event group");
  }
  xTaskCreate(AddTOCAR,"ADDTOCAR",10240,NULL,1,NULL);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  
}