/*
  Web Server

 A simple web server that shows the value of the analog input pins.
 using an Arduino Wiznet Ethernet shield.

 Circuit:
 * Ethernet shield attached to pins 10, 11, 12, 13
 * Analog inputs attached to pins A0 through A5 (optional)

 created 18 Dec 2009
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe
 modified 02 Sept 2015
 by Arturo Guadalupi

 */
#include <WString.h>
#include <SPI.h>
#include <UIPEthernet.h>

#define BUFSIZ 100

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(192, 168, 1, 177);

// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);



int isOn = 0;
const int relay = 7;
int pcIsOn = 0;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  
  pinMode(relay,OUTPUT);
  digitalWrite(relay, LOW);
  
  
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


  // start the Ethernet connection and the server:
  Ethernet.begin(mac, ip);
  server.begin();
  Serial.print("server is at ");
  Serial.println(Ethernet.localIP());
}


void loop() {

char clientline[BUFSIZ];
int index = 0;
int sensorValue = analogRead(A1);

  //get voltage from molex to see if pc is running
  float voltage = sensorValue * (5.0 / 1023.0);
  // listen for incoming clients
  EthernetClient client = server.available();
  if (client) {
    Serial.println("new client");
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        
        char c = client.read();

        // If it isn't a new line, add the character to the buffer
        if (c != '\n' && c != '\r') {
          clientline[index] = c;
          index++;
          // are we too big for the buffer? start tossing out data
          if (index >= BUFSIZ) 
            index = BUFSIZ -1;
          
          // continue to read more data!
          continue;
        }
        
        // got a \n or \r new line, which means the string is done
        clientline[index] = 0;
        // Print it out for debugging
        Serial.println(clientline);
        
        // Look for substring such as a request to get the root file
        if (strncmp(clientline, "GET /1", 6) == 0) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          client.println("Starting PC.");
          client.println("\r\n");          
          //Set relay on
          isOn = 1;
        } else if (strncmp(clientline, "GET /2", 6) == 0) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          client.println("Shutting Down PC.");
          client.println("\r\n");
          //Set relay off
          isOn = 2;
            
        } 
        else if (strncmp(clientline, "GET /3", 6) == 0) {
          if (voltage > 2)
            {
              
              // send a standard http response header
              client.println("HTTP/1.1 200 OK");
              client.println("Content-Type: text/html");
              client.println();
              client.println("Voltage");
              client.println(voltage);  

            }
            else
            {
              client.println("HTTP/1.1 200 OK");
              client.println("Content-Type: text/html");
              client.println();
              client.println("PC Not Running.");
              client.println("\r\n"); 
            }
          //Set relay off
          isOn = 3;
        } 
        else {
          // everything else is a 404
          client.println("HTTP/1.1 404 Not Found");
          client.println("Content-Type: text/html");
          client.println();
          client.println("<h2>File Not Found!</h2>");
        }
        break;
      }
    }
    // give the web browser time to receive the data
    delay(1);
    client.stop();
    Serial.println("client disconnected");
  }

  if (isOn == 1) 
    {

      Serial.println(voltage);
        if (voltage < 1 )
          {
            pcIsOn = 0;
            digitalWrite(relay, HIGH); // set the relay on
            delay (300);
            digitalWrite(relay, LOW);
            Serial.println("PC starting");
          }
        else
          {
            pcIsOn = 1;  
            Serial.println("PC already running");
          }
      isOn = 0;
    }
  else if (isOn == 2)
    {

      Serial.println(voltage);
        if (voltage > 2 )
          {
          pcIsOn = 1;
          digitalWrite(relay, HIGH); // set the relay on
          delay (300);
          digitalWrite(relay, LOW);
          Serial.println("PC shutting down");
          }
        else
          {
          pcIsOn = 0;  
          Serial.println("PC is not running");
          }
      isOn = 0;
    }
   else if (isOn == 3)
    {
      isOn = 0;
      digitalWrite(relay, LOW);
    }
  else
    {
      isOn = 0;
      digitalWrite(relay, LOW);
    }
}