/*
	FreeRTOS V5.4.1 - Copyright (C) 2009 Real Time Engineers Ltd.

	This file is part of the FreeRTOS distribution.

	FreeRTOS is free software; you can redistribute it and/or modify it	under 
	the terms of the GNU General Public License (version 2) as published by the 
	Free Software Foundation and modified by the FreeRTOS exception.
	**NOTE** The exception to the GPL is included to allow you to distribute a
	combined work that includes FreeRTOS without being obliged to provide the 
	source code for proprietary components outside of the FreeRTOS kernel.  
	Alternative commercial license and support terms are also available upon 
	request.  See the licensing section of http://www.FreeRTOS.org for full 
	license details.

	FreeRTOS is distributed in the hope that it will be useful,	but WITHOUT
	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
	more details.

	You should have received a copy of the GNU General Public License along
	with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
	Temple Place, Suite 330, Boston, MA  02111-1307  USA.


	***************************************************************************
	*                                                                         *
	* Looking for a quick start?  Then check out the FreeRTOS eBook!          *
	* See http://www.FreeRTOS.org/Documentation for details                   *
	*                                                                         *
	***************************************************************************

	1 tab == 4 spaces!

	Please ensure to read the configuration and relevant port sections of the
	online documentation.

	http://www.FreeRTOS.org - Documentation, latest information, license and
	contact details.

	http://www.SafeRTOS.com - A version that is certified for use in safety
	critical systems.

	http://www.OpenRTOS.com - Commercial support, development, porting,
	licensing and training services.
*/

/* 
 * Very simple task that responds with a single WEB page to http requests.
 *
 * The WEB page displays task and system status.  A semaphore is used to 
 * wake the task when there is processing to perform as determined by the 
 * interrupts generated by the Ethernet interface.
 */

/* Standard includes. */
#include <string.h>
#include <stdio.h>

/* Tern includes. */
#include "utils\system_common.h"
#include "i2chip_hw.h"
#include "socket.h"

/* FreeRTOS.org includes. */
#include <FreeRTOS.h>
#include <task.h>
#include <semphr.h>

/* The standard http port on which we are going to listen. */
#define httpPORT 80

#define httpTX_WAIT 2

/* Network address configuration. */
const unsigned portCHAR ucMacAddress[] =			{ 12, 128, 12, 34, 56, 78 };
const unsigned portCHAR ucGatewayAddress[] =		{ 192, 168, 2, 1 };
const unsigned portCHAR ucIPAddress[] =				{ 172, 25, 218, 210 };
const unsigned portCHAR ucSubnetMask[] =			{ 255, 255, 255, 0 };

/* The number of sockets this task is going to handle. */
#define httpSOCKET_NUM                       3
unsigned portCHAR ucConnection[ httpSOCKET_NUM ];

/* The maximum data buffer size we can handle. */
#define httpSOCKET_BUFFER_SIZE	2048

/* Standard HTTP response. */
#define httpOUTPUT_OK	"HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n"

/* Hard coded HTML components.  Other data is generated dynamically. */
#define HTML_OUTPUT_BEGIN "\
<HTML><head><meta http-equiv=\"Refresh\" content=\"1\;url=index.htm\"></head>\
<BODY bgcolor=\"#CCCCFF\"><font face=\"arial\"><H2>FreeRTOS.org<sup>tm</sup> + Tern E-Engine<sup>tm</sup></H2>\
<a href=\"http:\/\/www.FreeRTOS.org\">FreeRTOS.org Homepage</a><P>\
<HR>Task status table:\r\n\
<p><font face=\"courier\"><pre>Task          State  Priority  Stack	#<br>\
************************************************<br>"

#define HTML_OUTPUT_END   "\
</font></BODY></HTML>"

/*-----------------------------------------------------------*/

/*
 * Initialise the data structures used to hold the socket status.
 */
static void prvHTTPInit( void );

/*
 * Setup the Ethernet interface with the network addressing information.
 */
static void prvNetifInit( void );

/*
 * Generate the dynamic components of the served WEB page and transmit the 
 * entire page through the socket.
 */
static void prvTransmitHTTP( unsigned portCHAR socket );
/*-----------------------------------------------------------*/

/* This variable is simply incremented by the idle task hook so the number of
iterations the idle task has performed can be displayed as part of the served
page. */
unsigned portLONG ulIdleLoops = 0UL;

/* Data buffer shared by sockets. */
unsigned portCHAR ucSocketBuffer[ httpSOCKET_BUFFER_SIZE ];

/* The semaphore used by the Ethernet ISR to signal that the task should wake
and process whatever caused the interrupt. */
xSemaphoreHandle xTCPSemaphore = NULL;

/*-----------------------------------------------------------*/
void vHTTPTask( void * pvParameters )
{
portSHORT i, sLen;
unsigned portCHAR ucState;

	( void ) pvParameters;

    /* Create the semaphore used to communicate between this task and the
    WIZnet ISR. */
    vSemaphoreCreateBinary( xTCPSemaphore );

	/* Make sure everything is setup before we start. */
	prvNetifInit();
	prvHTTPInit();

	for( ;; )
	{
		/* Wait until the ISR tells us there is something to do. */
    	xSemaphoreTake( xTCPSemaphore, portMAX_DELAY );

		/* Check each socket. */
		for( i = 0; i < httpSOCKET_NUM; i++ )
		{
			ucState = select( i, SEL_CONTROL );

			switch (ucState)
			{
				case SOCK_ESTABLISHED :  /* new connection established. */

					if( ( sLen = select( i, SEL_RECV ) ) > 0 )
					{
						if( sLen > httpSOCKET_BUFFER_SIZE ) 
						{
							sLen = httpSOCKET_BUFFER_SIZE;
						}

						disable();
						
						sLen = recv( i, ucSocketBuffer, sLen );    

						if( ucConnection[ i ] == 1 )
						{	
							/* This is our first time processing a HTTP
							 request on this connection. */
							prvTransmitHTTP( i );
							ucConnection[i] = 0;
						}
						enable();
					}
					break;

				case SOCK_CLOSE_WAIT :

					close(i);
					break;

				case SOCK_CLOSED :

					ucConnection[i] = 1;
					socket( i, SOCK_STREAM, 80, 0x00 );
					NBlisten( i ); /* reinitialize socket. */
					break;
			}
		}
	}
}
/*-----------------------------------------------------------*/

static void prvHTTPInit( void )
{
unsigned portCHAR ucIndex;

	/* There are 4 total sockets available; we will claim 3 for HTTP. */
	for(ucIndex = 0; ucIndex < httpSOCKET_NUM; ucIndex++)
	{
		socket( ucIndex, SOCK_STREAM, httpPORT, 0x00 );
		NBlisten( ucIndex );
		ucConnection[ ucIndex ] = 1;
	}
}
/*-----------------------------------------------------------*/

static void prvNetifInit( void )
{
	i2chip_init();
	initW3100A();

	setMACAddr( ( unsigned portCHAR * ) ucMacAddress );
	setgateway( ( unsigned portCHAR * ) ucGatewayAddress );
	setsubmask( ( unsigned portCHAR * ) ucSubnetMask );
	setIP( ( unsigned portCHAR * ) ucIPAddress );

	/* See definition of 'sysinit' in socket.c
	 - 8 KB transmit buffer, and 8 KB receive buffer available.  These buffers
	   are shared by all 4 channels.
	 - (0x55, 0x55) configures the send and receive buffers at 
		httpSOCKET_BUFFER_SIZE bytes for each of the 4 channels. */
	sysinit( 0x55, 0x55 );
}
/*-----------------------------------------------------------*/

static void prvTransmitHTTP(unsigned portCHAR socket)
{
extern portSHORT usCheckStatus;

	/* Send the http and html headers. */
	send( socket, ( unsigned portCHAR * ) httpOUTPUT_OK, strlen( httpOUTPUT_OK ) );
	send( socket, ( unsigned portCHAR * ) HTML_OUTPUT_BEGIN, strlen( HTML_OUTPUT_BEGIN ) );

	/* Generate then send the table showing the status of each task. */
	vTaskList( ucSocketBuffer );
 	send( socket, ( unsigned portCHAR * ) ucSocketBuffer, strlen( ucSocketBuffer ) );

	/* Send the number of times the idle task has looped. */
    sprintf( ucSocketBuffer, "</pre></font><p><br>The idle task has looped 0x%08lx times<br>", ulIdleLoops );
	send( socket, ( unsigned portCHAR * ) ucSocketBuffer, strlen( ucSocketBuffer ) );

	/* Send the tick count. */
    sprintf( ucSocketBuffer, "The tick count is 0x%08lx<br>", xTaskGetTickCount() );
	send( socket, ( unsigned portCHAR * ) ucSocketBuffer, strlen( ucSocketBuffer ) );

	/* Show a message indicating whether or not the check task has discovered 
	an error in any of the standard demo tasks. */
    if( usCheckStatus == 0 )
    {
	    sprintf( ucSocketBuffer, "No errors detected." );
		send( socket, ( unsigned portCHAR * ) ucSocketBuffer, strlen( ucSocketBuffer ) );
    }
    else
    {
	    sprintf( ucSocketBuffer, "<font color=\"red\">An error has been detected in at least one task %x.</font><p>", usCheckStatus );
		send( socket, ( unsigned portCHAR * ) ucSocketBuffer, strlen( ucSocketBuffer ) );
    }

	/* Finish the page off. */
	send( socket, (unsigned portCHAR*)HTML_OUTPUT_END, strlen(HTML_OUTPUT_END));

	/* Must make sure the data is gone before closing the socket. */
	while( !tx_empty( socket ) )
    {
    	vTaskDelay( httpTX_WAIT );
    }
	close(socket);
}
/*-----------------------------------------------------------*/

void vApplicationIdleHook( void )
{
	ulIdleLoops++;
}