// Libraries we need
#include <SPI.h>
#include <Ethernet.h>

// Define server MAC and IP
// ID of Ethernet module:
byte mac[] = { 0x90, 0xA2, 0xDA, 0x00, 0xFE, 0x70 };
// IP address assigned to the Arduino Ethernet Shield:
IPAddress ip(192,168,1,191);

// Starts the server on port 80
EthernetServer server(80);

// Static variables
int  liquidDetection= 2;   // Pin for the water sensor
int CO2Sensor = A0;       // Pin for the CO2  sensor

// Dynamic variables
int liquidState = 0;   // We'll assume there is no water or CO2 around to start with
int CO2Value = 0;

void setup() {
  // Initializes the input pin for the liquid sensor
  pinMode(liquidDetection, INPUT);
  // Initiate the Ethernet connection and the server
  Ethernet.begin(mac, ip);
  server.begin();
}

void loop() {
  // Read in the digital value for the presence of liquid
  liquidState = digitalRead(liquidDetection);
  // Read in the analogical value of CO2 and store it as %
  CO2Value = analogRead(CO2Sensor);
  CO2Value = map(CO2Value,0,1023,0,100);

  // Listen for potential incoming clients
  EthernetClient client = server.available();
  if (client) {
    // An HTTP petition ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();

        // Check if the HTTP request has finished or not
        if (c == '\n' && currentLineIsBlank) {
          // Send standard HTTP header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();

           client.print("KITCHEN MONITOR");
           client.print(" => ");

            // Print out value from the liquid sensor
            client.print("[Presence of liquid");
            client.print(" = ");
            if (liquidState == 0){
            client.print("No");
            } else {
            client.print("Yes");
            }
            client.print("]");

            // Print the amount of CO2
            client.print(" ; [CO2");
            client.print(" = ");
            client.print(CO2Value);
            client.print(" %] ");

            break;
        }
        if (c == '\n') {
          // Start a new line
          currentLineIsBlank = true;
        }
        else if (c != '\r') {
          // Get a character
          currentLineIsBlank = false;
        }
      }
    }
    // Give the server time to receive the data
    delay(1);
    // Close connection
    client.stop();
  }
}