/*
 Curso Online NodeMCU ESP32 FreeRTOS
 Autor: Fernando Simplicio
 www.microgenios.com.br

 --Este Projeto tem por objetivo criar duas threads no FreeRTOS.
 --Cada thread é responsável em enviar uma string pela UART do ESP32 de maneira concorrente.
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "freertos/queue.h"

#include <Arduino.h>
#include <WiFi.h>
#include <WiFiMulti.h>
#include <HTTPClient.h>

/*
 * WiFi;
*/
#define WIFISSID "Wokwi-GUEST"
#define PASSWORD ""


static WiFiMulti wifiMulti;

/*
 * Função de inicialização da Serial e Oled;
*/
static void wifi_init( void )
{
    Serial.begin(115200); 
    for(uint8_t t = 4; t > 0; t--)
    {
        Serial.printf("[SETUP] WAIT %d...\n", t);
        Serial.flush();
        delay(500);
    }

    wifiMulti.addAP( WIFISSID, PASSWORD );

    for(;;){
        if(wifiMulti.run() != WL_CONNECTED) {
            Serial.println("WiFi not connected!");
            delay(1000);
        } else break;
    }


}

static void vTask_http( void *pvParameters )
{
    Serial.println( "Task1 Init..." );

    for( ;; )
    {
        if( (wifiMulti.run() == WL_CONNECTED) ) 
        {
            HTTPClient http;
            http.begin("http://api.thingspeak.com/update?api_key=D48A9UAR7NS3S94S&field1=0"); 
            http.addHeader( "Content-Type", "application/json" );
            http.addHeader( "Connection", "close" );

            int httpCode = http.GET();

            if( httpCode > 0 ) 
            {
                Serial.printf("HTTP_CODE_RETURN: %d\n", httpCode );
                if( httpCode == HTTP_CODE_OK ) 
                { 
                    String payload = http.getString();
                    Serial.println( payload.c_str() );
                }

            } else {
                Serial.printf("[HTTP] POST.. falha, error: %s", http.errorToString(httpCode).c_str() );
            }

            http.end();
        }
          
        vTaskDelay( 20000 / portTICK_PERIOD_MS );
    }
}

void setup( void ) 
{
    /**
    * Inicializa WiFi;
    */
    wifi_init(); 

    /**
    * Cria a tarefa responsável em requisitar o servidor thingspeak;
    */
    xTaskCreate(vTask_http, "Task 1", 1024*8, NULL, 2, NULL);
}

/**
 * Task loop;
 */
void loop( void ) 
{   
    vTaskDelay( 100 / portTICK_PERIOD_MS );
}