//https://circuits4you.com/2019/01/11/nodemcu-esp8266-arduino-json-parsing-example/

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>
#include <LiquidCrystal_I2C.h>
#include <WiFiUdp.h>
#include <NTPClient.h>
  // Define NTP Client to get time
  WiFiUDP ntpUDP;
  NTPClient timeClient(ntpUDP, "pool.ntp.org");
  
const char* SSID = "TP-Link_688A";
const char* PASSWORD = "debarbamiguel";
LiquidCrystal_I2C lcd(0x27,16,2);
String BASE_URL = "http://www.projeto8.migueldebarba.com.br/testejson.php";

#define ledR  14
#define ledG  12
#define ledB  15
String payload;
String linhaum,linhadois;
String currentDate;

int diai, mesi, anoi;
int diaf, mesf, anof;
  
//Week Days
String weekDays[7]={"Domingo", "Segunda", "Terça", "Quarta", "Quinta", "Sexta", "Sábado"};
//Month names
String months[12]={"Janeiro", "Fevereiro", "Março", "Abril", "Maio", "Junho", "Julho", "Agosto", "Setembro", "Outubro", "Novembro", "Dezembro"};

void pegahora(){
 timeClient.update();

  time_t epochTime = timeClient.getEpochTime();
  Serial.print("Epoch Time: ");
  Serial.println(epochTime);
  
  String formattedTime = timeClient.getFormattedTime();
  Serial.print("Formatted Time: ");
  Serial.println(formattedTime);  

  int currentHour = timeClient.getHours();
  Serial.print("Hour: ");
  Serial.print(currentHour);  

  int currentMinute = timeClient.getMinutes();
  Serial.print(" - Minutes: ");
  Serial.print(currentMinute); 
   
  int currentSecond = timeClient.getSeconds();
  Serial.print(" - Seconds: ");
  Serial.println(currentSecond);  

  String weekDay = weekDays[timeClient.getDay()];
  Serial.print("Week Day: ");
  Serial.println(weekDay);    

  //Get a time structure
  struct tm *ptm = gmtime ((time_t *)&epochTime); 

  int monthDay = ptm->tm_mday;
  Serial.print("Month day: ");
  Serial.print(monthDay);

  int currentMonth = ptm->tm_mon+1;
  Serial.print(" - Month: ");
  Serial.print(currentMonth);

  String currentMonthName = months[currentMonth-1];
  Serial.print(" - Month name: ");
  Serial.println(currentMonthName);

  int currentYear = ptm->tm_year+1900;
  Serial.print("Year: ");
  Serial.println(currentYear);

  //Print complete date:
  currentDate = String(currentYear) + "-" + String(currentMonth) + "-" + String(monthDay);
  Serial.print("Current date: ");
  Serial.println(currentDate);  
  }
void initSerial();
void initWiFi();
void httpRequest(String path);

// ############### OBJECTS ################# //

WiFiClient client;
HTTPClient http;
void setup() {

  pinMode(ledR,OUTPUT);  pinMode(ledG,OUTPUT);  pinMode(ledB,OUTPUT);
  initSerial();
  initWiFi();
  lcd.init();
  lcd.setBacklight(HIGH);

  // Initialize a NTPClient to get time
  timeClient.begin();
  // Set offset time in seconds to adjust for your timezone, for example:
  // GMT +1 = 3600
  // GMT +8 = 28800
  // GMT -1 = -3600
  // GMT 0 = 0
  timeClient.setTimeOffset(-3600);
  
}

// ############# HTTP REQUEST ################ //

void httpRequest(String path)
{
  String payload = makeRequest(path);
  if (!payload) {
    return;
  }
}

String makeRequest(String path)
{
  http.begin(client, BASE_URL);
  int httpCode = http.GET();                                  //Send the request
    if (httpCode > 0) { //Check the returning code
      payload = http.getString();   //Get the request response payload
    }

  if (httpCode < 0) {
    Serial.println("request error - " + httpCode);
    return "";
  }
  if (httpCode != HTTP_CODE_OK) {
    return "";
  }
  String response =  http.getString();
  http.end();
  return response;
}

// implementacao dos prototypes

void initSerial() {
  Serial.begin(115200);
}

void initWiFi() {
  delay(10);
  Serial.println("Conectando-se em: " + String(SSID));

  WiFi.begin(SSID, PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Conectado na Rede " + String(SSID) + " | IP => ");
  Serial.println(WiFi.localIP());
  lcd.setCursor(0,0);
  lcd.print(SSID);
  lcd.setCursor(0,1);
  lcd.print(WiFi.localIP());
  delay(2000);
 
}

void showLetters(int printStart, int startLetter)
{
  lcd.setCursor(printStart,0);
  for (int currentLetter = startLetter; currentLetter < linhaum.length(); currentLetter++)
  {
    lcd.print(linhaum[currentLetter]);
  } 
  lcd.print(" ");
  
  lcd.setCursor(printStart,1);
  for (int currentLetter = startLetter; currentLetter < linhadois.length(); currentLetter++)
  {
    lcd.print(linhadois[currentLetter]);
  } 

  lcd.print(" ");
  delay(250); 
  
}

void loop() {
  Serial.println("[GET] /testejason.php");
  Serial.println("");
  httpRequest("GET");
  Serial.println("payload:  " + payload);

  // Cria documento JSON (buffer)
  StaticJsonDocument<300> doc;
  // Desserializa
  DeserializationError error = deserializeJson(doc, payload);

  if (error) {
    Serial.print(F("Erro ao desserializar: "));
    Serial.println(error.f_str());
    return;
  }  

  // Como é um array, pegamos o primeiro elemento
  JsonObject painel = doc[0];

  // Acessa os campos
  int idpainel = painel["idpainel"];
  const char* mac = painel["mac_idmac"];
  const char* nome = painel["nome"];
  int ledr = painel["ledr"];
  int ledg = painel["ledg"];
  int ledb = painel["ledb"];
  
  linhaum = painel["linhaum"].as<String>();  
  linhadois = painel["linhadois"].as<String>();  
  int t1=linhaum.length();
  int t2=linhadois.length();
  String datainicial=painel["datainicial"].as<String>();  
  String datafinal=painel["datafinal"].as<String>();  

  // Mostra no Display
  for (int letter = 1; letter <= t1; letter++)  //scroll off to left
  {    showLetters(0, letter);  }
  
  // Mostra no LED RGB
  analogWrite(ledR,ledr);
  analogWrite(ledG,ledg);
  analogWrite(ledB,ledb);
  
  // Mostra no Serial
  Serial.println("=== Dados do Painel ===");
  Serial.print("ID: "); Serial.println(idpainel);
  Serial.print("MAC: ");  Serial.println(mac);
  Serial.print("Nome: ");  Serial.println(nome);
  Serial.print("LED R: ");  Serial.println(ledr);
  Serial.print("LED G: ");  Serial.println(ledg);
  Serial.print("LED B: ");  Serial.println(ledb);  
  Serial.print("Linha UM: ");  Serial.println(linhaum);  
  Serial.print("Linha DOIS: ");  Serial.println(linhadois);  
  Serial.print("Data inicial: ");  Serial.println(datainicial);  
  sscanf(datainicial.c_str(), "%d/%d/%d", &anoi, &mesi, &diai);  
  Serial.print("Dia: "); Serial.print(diai);Serial.print("Mês: "); Serial.print(mesi);Serial.print("Ano: "); Serial.println(anoi);
  Serial.print("Data final: ");  Serial.println(datafinal);  
  sscanf(datafinal.c_str(), "%d/%d/%d", &diaf, &mesf, &anof);  

  pegahora();
  Serial.print("Server date: ");
  Serial.println(currentDate);  
  
  delay(5000);
}