#include "application.h"
#include <string.h>

TCPClient client;


// Define Constants
// Max string length may have to be adjusted depending on data to be extracted
#define MAX_STRING_LEN  50

// Setup vars
String tagStr = "";
String dataStr = "";
String tmpStr = "";
int len;

// Flags to differentiate XML tags from document elements (ie. data)
boolean tagFlag = false;
boolean dataFlag = false;


/* This function is called once at start up ----------------------------------*/
void setup()
{
    tagStr.reserve(MAX_STRING_LEN);
    tmpStr.reserve(MAX_STRING_LEN);
    dataStr.reserve(300);
    Serial.begin(115200);
    while(!Serial.available());

    if (client.connect("www.google.com", 80))
    {
        Serial.println("connected");
        client.print("GET /calendar/feeds/somePrivateGoogleCalendarAddress/full");
        client.print("?futureevents=true&fields=entry(title,gd:when)&max-results=5&orderby=starttime&sortorder=a");
        client.println("HTTP/1.0");
        client.println();
    }
    else
    {
        Serial.println("connection failed");
    }
    delay(100);
}

/* This function loops forever --------------------------------------------*/
void loop()
{
    if (client.available())
    {
        char c = client.read();
        if(dataFlag) dataStr += c;

        if (c != '>') {
            tmpStr += c;
            tagFlag = true;
        } else if (c == '>') {
            tmpStr += c;

            if (tagFlag) {
                tagStr = tmpStr;
            }

            if (tagStr == "<entry>"){
                dataFlag = true;
            } else if (tagStr == "</entry>"){
                dataStr[dataStr.length()-8] = '\0';
                Serial.println(dataStr);
                dataFlag = false;
                dataStr[0] = '\0';
            }

            // Clear tmp
            tmpStr[0] = '\0';
            tagFlag = false;
        }
    }
    if (!client.connected()) {
        Serial.println();
        Serial.println("disconnecting.");
        client.stop();

        // do nothing forevermore:
        while(true);
    }
}