#include <ArduinoJson.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <SPI.h>
const char* ssid = "XXXXXXXXX";
const char* password =  "XXXXXXXXXX";
StaticJsonDocument<1024> doc; 
#define COAL 0
#define GAS 1
#define IMPORT 2
#define OTHER 3
#define RENEW 4
float coal, gas, import, other, renew;
float domestic;

void setup() {
  SPI.begin(1, 4, 2, 3); // (int8_t sck, int8_t miso, int8_t mosi, int8_t ss)
  Serial.begin(115200);
  
  delay(1000);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    Serial.println("Connecting to Wifi");
    writePL9823(0x00);
    delay(1000);
    writePL9823(0xffff00);
    delay(1000);    
  }
  Serial.println("Wifi ready");
  
}

void loop() {
  // put your main code here, to run repeatedly:
  if ((WiFi.status() == WL_CONNECTED)) { //Check the current connection status

    HTTPClient http;

    // Interesting discovery : setting the date/time to a future data returns the latest value
    http.begin("http://smartgriddashboard.eirgrid.com/DashboardService.svc/data?area=fuelmix&region=ALL&datefrom=17-Dec-2050+23:59&dateto=17-Dec-2050+23:59"); //Specify the URL
    int httpCode = http.GET();                                        //Make the request

    if (httpCode > 0) { // Http error?

      String payload = http.getString();
      Serial.println(httpCode);
      Serial.println(payload);
      deserializeJson(doc, payload);
      coal = doc["Rows"][COAL]["Value"];
      gas = doc["Rows"][GAS]["Value"];
      import = doc["Rows"][IMPORT]["Value"];
      other = doc["Rows"][OTHER]["Value"];
      renew = doc["Rows"][RENEW]["Value"];
      domestic = coal + gas + other + renew;
      Serial.print("Total (without export)= ");
      Serial.println(domestic);
      Serial.print("Renew = ");
      Serial.println(renew);
      Serial.print("% = ");
      Serial.println(renew / domestic);
      if ( (renew / domestic) > 0.5)
      {
        writePL9823(0x00ff00);
      }
      else
      {
        writePL9823(0xff0000);
      }
      delay(15 * 60 * 1000); // wait 15 minutes as that is the update interval
    }
    else {
      Serial.print("HTTP Error ");
      Serial.println(httpCode);
      writePL9823(0xff);
      delay(10000);
    }
    http.end(); //Free the resources
  }
}

void writePL9823(uint32_t Colour)
{
  // each colour bit should map to 4 SPI bits.
  // Format of Colour (bytes) 00RRGGBB
  uint8_t SPI_Output[12];
  int SrcIndex = 0;
  int DestIndex = 0;
  for (DestIndex = 0; DestIndex < 12; DestIndex++)
  {
    if (Colour & (1 << 23))
    {
      SPI_Output[DestIndex] = 0xe0;
    }
    else
    {
      SPI_Output[DestIndex] = 0x80;
    }
    Colour = Colour << 1;
    if (Colour & (1 << 23))
    {
      SPI_Output[DestIndex] |= 0xe;
    }
    else
    {
      SPI_Output[DestIndex] |= 0x8;
    }
    Colour = Colour << 1;
  }
  SPI.beginTransaction(SPISettings(2000000, MSBFIRST, SPI_MODE0));
  SPI.transfer(SPI_Output, 12);
  delay(10);
  SPI.endTransaction();
}