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// constants won't change. They're used here to set pin numbers:
const int button1Pin = 22;     // the number of the pushbutton pin
const int button2Pin = 24;     // the number of the pushbutton pin
const int button3Pin = 26;     // the number of the pushbutton pin
const int button4Pin = 28;     // the number of the pushbutton pin
const int button5Pin = 30;     // the number of the pushbutton pin
const int button6Pin = 32;     // the number of the pushbutton pin
const int led1RPin =  2;      // the number of the LED pin
const int led2GPin =  3;      // the number of the LED pin
const int led3BPin =  5;      // the number of the LED pin
const int led4RPin =  6;      // the number of the LED pin
const int led4GPin =  7;      // the number of the LED pin
const int led5RPin =  8;      // the number of the LED pin
const int led5BPin =  9;      // the number of the LED pin
const int led5GPin =  44;      // the number of the LED pin
const int led6BPin =  45;      // the number of the LED pin
const int led6RPin =  46;      // the number of the LED pin
#include <SPI.h>
#include <Ethernet.h>


// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network.
// gateway and subnet are optional:
byte mac[] = {
  0xA8, 0x61, 0x0A, 0xAE, 0x64, 0x52 };
IPAddress ip(10, 200, 1, 199);
IPAddress myDns(10, 100, 10, 10);
IPAddress gateway(10, 200, 1, 1);
IPAddress subnet(255, 255, 255, 0);
// telnet defaults to port 23
EthernetServer server(1234);
bool alreadyConnected = false; // whether or not the client was connected previously
String commandStr;

// variables will change:
int button1State = 0;         // variable for reading the pushbutton status
int button2State = 0;         // variable for reading the pushbutton status
int button3State = 0;         // variable for reading the pushbutton status
int button4State = 0;         // variable for reading the pushbutton status
int button5State = 0;         // variable for reading the pushbutton status
int button6State = 0;         // variable for reading the pushbutton status
int lastbutton1State = 0;
int lastbutton2State = 0;
int lastbutton3State = 0;
int lastbutton4State = 0;
int lastbutton5State = 0;
int lastbutton6State = 0;



void setup() {
  // initialize the LED pin as an output:
  pinMode(led1RPin, OUTPUT);
  pinMode(led2GPin, OUTPUT);  
  pinMode(led3BPin, OUTPUT);
  pinMode(led4RPin, OUTPUT);
  pinMode(led4GPin, OUTPUT);  
  pinMode(led5RPin, OUTPUT);
  pinMode(led5GPin, OUTPUT);
  pinMode(led5BPin, OUTPUT);  
  pinMode(led6RPin, OUTPUT);
  pinMode(led6BPin, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(button1Pin, INPUT);
  pinMode(button2Pin, INPUT);
  pinMode(button3Pin, INPUT);
  pinMode(button4Pin, INPUT);
  pinMode(button5Pin, INPUT);
  pinMode(button6Pin, INPUT);
    // You can use Ethernet.init(pin) to configure the CS pin
    Ethernet.init(10);  // Most Arduino shields
  //Ethernet.init(5);   // MKR ETH shield
  //Ethernet.init(0);   // Teensy 2.0
  //Ethernet.init(20);  // Teensy++ 2.0
  //Ethernet.init(15);  // ESP8266 with Adafruit Featherwing Ethernet
  //Ethernet.init(33);  // ESP32 with Adafruit Featherwing Ethernet
  // initialize the ethernet device
  Ethernet.begin(mac, ip, myDns, gateway, subnet);
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
   while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only 
      }


  // Check for Ethernet hardware present
  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
    Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
    while (true) {
      delay(1); // do nothing, no point running without Ethernet hardware
    }
  }
  if (Ethernet.linkStatus() == LinkOFF) {
    Serial.println("Ethernet cable is not connected.");
  }
  // start listening for clients
  server.begin();
  Serial.print("Server address:");
  Serial.println(Ethernet.localIP());   
}



void loop() {
  ButtonState();
  TCPRead();
}



void ButtonState(){  
  // read the state of the pushbutton value:
  button1State = digitalRead(button1Pin);
  button2State = digitalRead(button2Pin);
  button3State = digitalRead(button3Pin);
  button4State = digitalRead(button4Pin);
  button5State = digitalRead(button5Pin);
  button6State = digitalRead(button6Pin);  
   // wait for a new client:
 EthernetClient client = server.available();
  // when the client sends the first byte, say hello:
  if (client) {
    if (!alreadyConnected) {
      // clear out the input buffer:
      client.flush();
      Serial.println("We have a new client");
      client.println("Hello, client!");
      alreadyConnected = true;
    }
  }

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (button1State != lastbutton1State) {
      if (button1State == HIGH) {
      // turn LED on:
      //digitalWrite(led1Pin, HIGH);
      server.write("Button1_High\r\n");
      Serial.write("Button1_High\r\n");
      
    } else {
      // turn LED off:
      //digitalWrite(led1Pin, LOW);
      server.write("Button1_Low\r\n");
      Serial.write("Button1_Low\r\n");
      
    }
    lastbutton1State = button1State;
  }
  if (button2State != lastbutton2State) {
      if (button2State == HIGH) {
      // turn LED on:
      //digitalWrite(led2Pin, HIGH);
      server.println("Button2_High\r\n");
      Serial.write("Button2_High\r\n");
    } else {
      // turn LED off:
      //digitalWrite(led2Pin, LOW);
      server.println("Button2_Low\r\n");
      Serial.write("Button2_Low\r\n");
    }
    lastbutton2State = button2State;
  }
  if (button3State != lastbutton3State) {
      if (button3State == HIGH) {
      // turn LED on:
      //digitalWrite(led3Pin, HIGH);
      server.println("Button3_High\r\n");
      Serial.write("Button3_High\r\n");
    } else {
      // turn LED off:
      //digitalWrite(led3Pin, LOW);
      server.println("Button3_Low\r\n");
      Serial.write("Button3_Low\r\n");
    }
    lastbutton3State = button3State;
  }
  if (button4State != lastbutton4State) {
      if (button4State == HIGH) {
      // turn LED on:
      //digitalWrite(led4Pin, HIGH);
      server.println("Button4_High\r\n");
      Serial.write("Button4_High\r\n");
    } else {
      // turn LED off:
      //digitalWrite(led4Pin, LOW);
      server.println("Button4_Low\r\n");
      Serial.write("Button4_Low\r\n");
    }
    lastbutton4State = button4State;
  }
  if (button5State != lastbutton5State) {
      if (button5State == HIGH) {
      // turn LED on:
      //digitalWrite(led5Pin, HIGH);
      server.println("Button5_High\r\n");
      Serial.write("Button5_High\r\n");
    } else {
      // turn LED off:
      //digitalWrite(led5Pin, LOW);
      server.println("Button5_Low\r\n");
      Serial.write("Button5_Low\r\n");
    }
    lastbutton5State = button5State;
  }
  if (button6State != lastbutton6State) {
      if (button6State == HIGH) {
      // turn LED on:
      //digitalWrite(led6Pin, HIGH);
      server.println("Button6_High\r\n");
      Serial.write("Button6_High\r\n");
    } else {
      // turn LED off:
      //digitalWrite(led6Pin, LOW);
      server.println("Button6_Low\r\n");
      Serial.write("Button6_Low\r\n");
    }
    lastbutton6State = button6State;
  }  
}


void TCPRead(){
   EthernetClient client = server.available();
    if (client.available()) {
        // Read char until linefeed
        char c = client.read();
        if (c != '\n') {
            // Add received char to string variable
            commandStr += c;
            //Serial.println("Command: " + commandStr);
        } else {
            // Print received command to serial monitor
            Serial.println("Command: " + commandStr);

            // Process the received command
            processCommand(commandStr);
    
            // Clear variable for receive next command
            commandStr = "";
        }
    }
}

void processCommand(String cmd) {
    if (cmd == "LED1_HIGH") {
        // Turn on LED
        analogWrite(led1RPin, 0);
    } else if (cmd == "LED1_LOW") {
        // Turn off LED
        analogWrite(led1RPin, 230);
    } else if (cmd == "LED2_HIGH") {
        // Turn on LED
        analogWrite(led2GPin, 0);
    } else if (cmd == "LED2_LOW") {
        // Turn off LED
        analogWrite(led2GPin, 240); 
    } else if (cmd == "LED3_HIGH") {
        // Turn on LED
        analogWrite(led3BPin, 0);
    } else if (cmd == "LED3_LOW") {
        // Turn off LED
        analogWrite(led3BPin, 230);      
    } else if (cmd == "LED4_HIGH") {
        // Turn on LED
        analogWrite(led4RPin, 0);
        analogWrite(led4GPin, 0);
    } else if (cmd == "LED4_LOW") {
        // Turn off LED
        analogWrite(led4RPin, 235);
        analogWrite(led4GPin, 235);      
    } else if (cmd == "LED5_HIGH") {
        // Turn on LED
        analogWrite(led5RPin, 0);
        analogWrite(led5GPin, 0);
        analogWrite(led5BPin, 0);
    } else if (cmd == "LED5_LOW") {
        // Turn off LED
        analogWrite(led5RPin, 230);
        analogWrite(led5GPin, 230);
        analogWrite(led5BPin, 230); 
    } else if (cmd == "LED6_HIGH") {
        // Turn on LED
        analogWrite(led6RPin, 0);
        analogWrite(led6BPin, 0);
    } else if (cmd == "LED6_LOW") {
        // Turn off LED
        analogWrite(led6RPin, 240);
        analogWrite(led6BPin, 240);         
    }
    // end of script
    }