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#include <PubSubClient.h>
#include <SPI.h>
#include <Ethernet2.h>
#include <EthernetUdp2.h>
#include "time.h"


const char* ssid = "xxxxxxxxx";
const char* password =  "xxxxxxxxxxx";
const char* mqttServer = "xxxxxxxxxx";
const int mqttPort = 1883;
const char* mqttUser = "xxxxxx";
const char* mqttPassword = "xxxxxxxxxx";

uint8_t baseMac[6];


unsigned int localPort = 8888;       // local port to listen for UDP packets

char timeServer[] = "time.nist.gov"; // time.nist.gov NTP server

const int NTP_PACKET_SIZE = 48; // NTP time stamp is in the first 48 bytes of the message

byte packetBuffer[ NTP_PACKET_SIZE]; //buffer to hold incoming and outgoing packets

// A UDP instance to let us send and receive packets over UDP
EthernetUDP Udp;

//const int timeZone = -6;     // Central Standard Time
const int timeZone = 5;     // Central Daylight Time
//const int timeZone = -5;  // Eastern Standard Time (USA)
//const int timeZone = -4;  // Eastern Daylight Time (USA)
//const int timeZone = -8;  // Pacific Standard Time (USA)
//const int timeZone = -7;  // Pacific Daylight Time (USA)

#if defined(ESP8266)
  // default for ESPressif
  #define WIZ_CS 15
#elif defined(ESP32)
  #define WIZ_CS 4
#elif defined(ARDUINO_STM32_FEATHER)
  // default for WICED
  #define WIZ_CS PB4
#elif defined(TEENSYDUINO)
  #define WIZ_CS 10
#elif defined(ARDUINO_FEATHER52)
  #define WIZ_CS 11
#else   // default for 328p, 32u4 and m0
  #define WIZ_CS 10
#endif

float rain = 0.00;
String rainStr = "";
float tempT = 35.0;
String tempTStr = "";
byte rainDir = 1;
byte tempTDir = 1;

unsigned long timePub = 0UL;
unsigned long updateNTP = 30000UL;
unsigned long currentTime = 0UL;

EthernetClient espClient;
PubSubClient client(espClient);

void setup() {

  Serial.begin(115200);
  esp_read_mac(baseMac, ESP_MAC_WIFI_STA);
  delay(500);
  Serial.print(F("Mac Address: "));
  for (byte x = 0; x < 6; x++)
  {
    if (baseMac[x] < 0x10)
    {
      Serial.print(F("0"));
      Serial.print(baseMac[x]);
    }
    else
    {
      Serial.print(baseMac[x], HEX);
    }
    if (x < 5)
    {
      Serial.print(F(":"));
    }
  }
  Serial.println(F(""));
  Ethernet.init(WIZ_CS);
  delay(1000);
  if (Ethernet.begin(baseMac) == 0) {
    // no point in carrying on, so do nothing forevermore:
    while (1) {
      Serial.println("Failed to configure Ethernet using DHCP");
      delay(10000);
    }
  }
  Serial.print(F("IP number assigned by DHCP is "));
  Serial.println(Ethernet.localIP());
  Udp.begin(localPort);
  delay(1000);
  getTime();
  currentTime = millis();

  client.setServer(mqttServer, mqttPort);
  client.setCallback(callback);

  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");

    if (client.connect("ESP32Client", mqttUser, mqttPassword )) {

      Serial.println("connected");

    } else {

      Serial.print("failed with state ");
      Serial.print(client.state());
      delay(2000);

    }
  }

  client.publish("your pub topic", "Test MQTT Client Starting");
  client.subscribe("your sub topic 1");
  client.subscribe("your sub topic 2");
  timePub = millis();
  rainStr = String(rain, 2);
  tempTStr = String(tempT, 1);

}

void callback(char* topic, byte* payload, unsigned int length) {

  Serial.print("Message arrived in topic: ");
  Serial.println(topic);

  Serial.print("Message:");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }

  Serial.println();
  Serial.println("-----------------------");

}

time_t prevDisplay = 0; // when the digital clock was displayed

void loop() {
  client.loop();
  if (millis() < currentTime)
  {
    currentTime = millis();
  }
  if (millis() - currentTime > updateNTP)
  {
    getTime();
    currentTime = millis();
  }
  if (millis() < timePub)//account for millis() rollover
  {
    timePub = millis() - timePub;
  }
  if ((millis() - timePub) > 60000UL)
  {
    if (rainDir == 0)
    {
      rain -= 0.01;
    }
    else
    {
      rain += 0.01;
    }
    rainStr = String(rain, 2);
    if (rain >= 5.00)
    {
      rainDir = 0;
    }
    if (rain <= 0.00)
    {
      rainDir = 1;
    }
    if (tempTDir == 0)
    {
      tempT -= 0.1;
    }
    else
    {
      tempT += 0.1;
    }
    tempTStr = String(tempT, 1);
    if (tempT >= 40.0)
    {
      tempTDir = 0;
    }
    if (tempT <= 32.0)
    {
      tempTDir = 1;
    }
    String pubString = String(rainStr + "," + tempTStr);
    char message_buff[pubString.length() + 1];
    pubString.toCharArray(message_buff, pubString.length() + 1);
    client.publish("robe/test", message_buff);
    timePub = millis();
  }
}



//-------- NTP code ----------




// send an NTP request to the time server at the given address
void sendNTPpacket(const char * address) {
  // set all bytes in the buffer to 0
  memset(packetBuffer, 0, NTP_PACKET_SIZE);
  // Initialize values needed to form NTP request
  // (see URL above for details on the packets)
  packetBuffer[0] = 0b11100011;   // LI, Version, Mode
  packetBuffer[1] = 0;     // Stratum, or type of clock
  packetBuffer[2] = 6;     // Polling Interval
  packetBuffer[3] = 0xEC;  // Peer Clock Precision
  // 8 bytes of zero for Root Delay & Root Dispersion
  packetBuffer[12]  = 49;
  packetBuffer[13]  = 0x4E;
  packetBuffer[14]  = 49;
  packetBuffer[15]  = 52;
  // all NTP fields have been given values, now
  // you can send a packet requesting a timestamp:                 
  Udp.beginPacket(address, 123); //NTP requests are to port 123
  Udp.write(packetBuffer, NTP_PACKET_SIZE);
  Udp.endPacket();
}

void getTime()
{
  sendNTPpacket(timeServer); // send an NTP packet to a time server

  // wait to see if a reply is available
  delay(1000);
  if ( Udp.parsePacket() ) {
    // We've received a packet, read the data from it
    Udp.read(packetBuffer, NTP_PACKET_SIZE); // read the packet into the buffer

    //the timestamp starts at byte 40 of the received packet and is four bytes,
    // or two words, long. First, esxtract the two words:

    unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
    unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]);
    // combine the four bytes (two words) into a long integer
    // this is NTP time (seconds since Jan 1 1900):
    unsigned long secsSince1900 = highWord << 16 | lowWord;
    Serial.print("Seconds since Jan 1 1900 = " );
    Serial.println(secsSince1900);

    // now convert NTP time into everyday time:
    Serial.print("Unix time = ");
    // Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
    const unsigned long seventyYears = 2208988800UL;
    // subtract seventy years:
    unsigned long epoch = secsSince1900 - seventyYears;
    // print Unix time:
    Serial.println(epoch);


    // print the hour, minute and second:
    Serial.print("The UTC time is ");       // UTC is the time at Greenwich Meridian (GMT)
    Serial.print((epoch  % 86400L) / 3600); // print the hour (86400 equals secs per day)
    Serial.print(':');
    if ( ((epoch % 3600) / 60) < 10 ) {
      // In the first 10 minutes of each hour, we'll want a leading '0'
      Serial.print('0');
    }
    Serial.print((epoch  % 3600) / 60); // print the minute (3600 equals secs per minute)
    Serial.print(':');
    if ( (epoch % 60) < 10 ) {
      // In the first 10 seconds of each minute, we'll want a leading '0'
      Serial.print('0');
    }
    Serial.println(epoch % 60); // print the second
  }
}