/******************************************************************************

  Filename:		webserver.h
  Description:	Webserver app for the WiShield 1.0

 ******************************************************************************

  TCP/IP stack and driver for the WiShield 1.0 wireless devices

  Copyright(c) 2009 Async Labs Inc. All rights reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  This program 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
  this program; if not, write to the Free Software Foundation, Inc., 59
  Temple Place - Suite 330, Boston, MA  02111-1307, USA.

  Contact Information:
  <asynclabs@asynclabs.com>

   Author               Date        Comment
  ---------------------------------------------------------------
   AsyncLabs			05/29/2009	Initial version

 *****************************************************************************/

#include "uip.h"
#include <string.h>
#include "webserver.h"
#include "config.h"

static int handle_connection(struct webserver_state *s);

void webserver_init(void)
{
	uip_listen(HTONS(80));
}

void webserver_appcall(void)
{
	struct webserver_state *s = &(uip_conn->appstate);

	if(uip_connected()) {
		PSOCK_INIT(&s->p, s->inputbuf, sizeof(s->inputbuf));
	}

	handle_connection(s);
}

#define ISO_nl      0x0a
#define ISO_space   0x20
#define ISO_slash   0x2f

const char http_get[5] = {0x47, 0x45, 0x54, 0x20, };	/* "GET " */

unsigned short fill_buf(void* blk)
{
	unsigned short webpage_len;
	char int_string[4];

	webpage_len = (strlen_P(webpage)>uip_mss())?uip_mss():strlen_P(webpage);

	memcpy_P(uip_appdata, webpage, webpage_len);

	sprintf(int_string, "%X", mfg_id[0]);
	memcpy(&uip_appdata[104], int_string, 2);
	sprintf(int_string, "%X", mfg_id[1]);
	memcpy(&uip_appdata[108], int_string, 2);

	return webpage_len;
}

static int handle_connection(struct webserver_state *s)
{
	PSOCK_BEGIN(&s->p);

	// the incoming GET request will have the following format:
	// GET / HTTP/1.1 ....
	// we have to parse this string to determine the resource being requested
	// if the requested resource is not the root webpage ('/') then,
	// GET /<resource name> HTTP/1.1 ....
	// we should parse the specific resource and react appropriately

	// read incoming data until we read a space character
	PSOCK_READTO(&s->p, ISO_space);

	// parse the data to determine if it was a GET request
	if(strncmp(s->inputbuf, http_get, 4) != 0) {
		PSOCK_CLOSE_EXIT(&s->p);
	}

	// continue reading until the next space character
	PSOCK_READTO(&s->p, ISO_space);

	// determine the requested resource
	// in this case, we check if the request was for the '/' root page
	// AKA index.html
	if(s->inputbuf[0] != ISO_slash) {
		// request for unknown webpage, close and exit
		PSOCK_CLOSE_EXIT(&s->p);
	}

	if(s->inputbuf[1] != ISO_space) {
		// request for unavailable resource
		// not supported, modify to add support for additional resources
		PSOCK_CLOSE_EXIT(&s->p);
	}

	//PSOCK_SEND_STR(&s->p, "HTTP/1.1 200 OK\r\n");
	//PSOCK_SEND_STR(&s->p, "Content-Type: text/html\r\n");
	//PSOCK_SEND_STR(&s->p, "\r\n");
	//PSOCK_SEND_STR(&s->p, "Hello World, I am WiShield");
	//PSOCK_SEND_STR(&s->p, "<center><h1>Hello World!! I am WiShield</h1></center>");
	PSOCK_GENERATOR_SEND(&s->p, fill_buf, 0);
	PSOCK_CLOSE(&s->p);
	PSOCK_END(&s->p);
}