/*
  Cosm sensor client
 
 This sketch connects an analog sensor to Cosm (http://www.cosm.com)
 using a Wiznet Ethernet shield. You can use the Arduino Ethernet shield, or
 the Adafruit Ethernet shield, either one will work, as long as it's got
 a Wiznet Ethernet module on board.
 
 This example has been updated to use version 2.0 of the Cosm.com API. 
 To make it work, create a feed with a datastream, and give it the ID
 sensor1. Or change the code below to match your feed.
 
 
 Circuit:
 * Analog sensor attached to analog in 0
 * Ethernet shield attached to pins 10, 11, 12, 13
 
 created 15 March 2010
 updated 16 Mar 2012
 by Tom Igoe with input from Usman Haque and Joe Saavedra
 
http://arduino.cc/en/Tutorial/PachubeClient
 This code is in the public domain.
 
 */

#include <SPI.h>
#include <Ethernet.h>

#define APIKEY         "LlVFsrM3wLNalsfrHXu1NVRDhPeSAKxpVkhjNUI5RnlEVT0g" // your cosm api key
#define FEEDID         83080 // your feed ID
#define USERAGENT      "Cosm Arduino Example (83080)" // user agent is the project name

// assign a MAC address for the ethernet controller.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
// fill in your address here:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};

IPAddress ip(10,0,1,79);//<<< ENTER YOUR IP ADDRESS HERE!!!

// Initialize the Ethernet server library
// with the IP address and port you want to use 
// (port 80 is default for HTTP):
EthernetServer server(7777);

// initialize the library instance:
EthernetClient client;

// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
IPAddress cosmserver(173,203,98,29);    // numeric IP for api.cosm.com
//char server[] = "api.cosm.com";   // name address for cosm API

unsigned long lastConnectionTime = 0;          // last time you connected to the server, in milliseconds
boolean lastConnected = false;                 // state of the connection last time through the main loop
const unsigned long postingInterval = 25*1000; //delay between updates to Cosm.com
String sen = "sensor";

void setup() {
  // start serial port:
  Serial.begin(9600);
 // start the Ethernet connection:
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // DHCP failed, so use a fixed IP address:
    Ethernet.begin(mac, ip);
  }
}

void loop() {
  // read the analog sensor:

  // if there's incoming data from the net connection.
  // send it out the serial port.  This is for debugging
  // purposes only:
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  }

  // if there's no net connection, but there was one last time
  // through the loop, then stop the client:
  if (!client.connected() && lastConnected) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
  }

  // if you're not connected, and ten seconds have passed since
  // your last connection, then connect again and send data:
  if(!client.connected() && (millis() - lastConnectionTime > postingInterval)) {
    sendData();
  }
  // store the state of the connection for next time through
  // the loop:
  lastConnected = client.connected();
}

// this method makes a HTTP connection to the server:
void sendData() {
  // if there's a successful connection:
  if (client.connect(cosmserver, 80)) {
    Serial.println("connecting...");
    // send the HTTP PUT request:
    client.print("PUT /v2/feeds/");
    client.print(FEEDID);
    client.println(".csv HTTP/1.1");
    client.println("Host: api.cosm.com");
    client.print("X-ApiKey: ");
    client.println(APIKEY);
    client.print("User-Agent: ");
    client.println(USERAGENT);
    client.print("Content-Length: ");

    // calculate the length of the sensor reading in bytes:
    // 8 bytes for "sensor1," + number of digits of the data:
    //int thisLength = 8 + getLength(thisData);
    client.println(12);

    // last pieces of the HTTP PUT request:
    client.println("Content-Type: text/csv");
    client.println("Connection: close");
    client.println();

    // here's the actual content of the PUT request:
  	for (int analogChannel = 2; analogChannel < 6; analogChannel++) {
	    int sensorReading = analogRead(analogChannel);    
	    String schan = sen + analogChannel + ",";
	    client.print(schan);
	    client.println(sensorReading);
  	}
  } 
  else {
    // if you couldn't make a connection:
    Serial.println("connection failed");
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
  }
   // note the time that the connection was made or attempted:
  lastConnectionTime = millis();
}


// This method calculates the number of digits in the
// sensor reading.  Since each digit of the ASCII decimal
// representation is a byte, the number of digits equals
// the number of bytes:

int getLength(int someValue) {
  // there's at least one byte:
  int digits = 1;
  // continually divide the value by ten, 
  // adding one to the digit count for each
  // time you divide, until you're at 0:
  int dividend = someValue /10;
  while (dividend > 0) {
    dividend = dividend /10;
    digits++;
  }
  // return the number of digits:
  return digits;
}