/**
 * \addtogroup apps
 * @{
 */

/**
 * \defgroup httpd Web server
 * @{
 * The uIP web server is a very simplistic implementation of an HTTP
 * server. It can serve web pages and files from a read-only ROM
 * filesystem, and provides a very small scripting language.

 */

/**
 * \file
 *         Web server
 * \author
 *         Adam Dunkels <adam@sics.se>
 */

/*
 * Copyright (c) 2004, Adam Dunkels.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * This file is part of the uIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 * $Id: httpd.c,v 1.2 2006/06/11 21:46:38 adam Exp $
 */

#include "uip.h"
#include "httpd.h"
#include "httpd-fs.h"
#include "httpd-cgi.h"
#include "http-strings.h"
#include "printf-stdarg.h"
#include "psock.h"

#include <string.h>

#define STATE_WAITING 0
#define STATE_OUTPUT  1

#define ISO_nl      0x0a
#define ISO_space   0x20
#define ISO_bang    0x21
#define ISO_percent 0x25
#define ISO_period  0x2e
#define ISO_slash   0x2f
#define ISO_colon   0x3a

/*---------------------------------------------------------------------------*/
static unsigned short generate_part_of_file(void *state) {
	struct httpd_state *s = (struct httpd_state *) state;

	if (s->file.len > uip_mss()) {
		s->len = uip_mss();
	} else {
		s->len = s->file.len;
	}

	if (s->file.data == WEBCAM_ADDRESS) {
		s->len = get_jpeg_data_packet(uip_appdata, s->len);
#ifdef debugKam
		xprintf("\n\r 2ZZZ");
#endif
	} else {
		memcpy(uip_appdata, s->file.data, s->len);
	}

	return s->len;
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(send_file(struct httpd_state *s)) {
	PSOCK_BEGIN(&s->sout);
		if(s->file.data==WEBCAM_ADDRESS) {
			cam_reset_packages();
			cam_packages_total(s->file.len);

			do {
#ifdef debugKam
				xprintf("\n\r 1ZZZ");
#endif


				PSOCK_GENERATOR_SEND(&s->sout, generate_part_of_file, s);
#ifdef debugKam
				xprintf("\n\r 3ZZZ");
#endif
				cam_next_packages();
				s->file.len -= s->len;
				//s->file.data += s->len;
			}while(s->file.len > 0);
			get_jpeg_data_packet_end();
			cam_podmienka=0;
			xSemaphoreGive(CamPictureMutex);

		} else {
			do {
				PSOCK_GENERATOR_SEND(&s->sout, generate_part_of_file, s);
				s->file.len -= s->len;
				s->file.data += s->len;
			}while(s->file.len > 0);
		}

		PSOCK_END(&s->sout);
	}
	/*---------------------------------------------------------------------------*/
static
PT_THREAD(send_part_of_file(struct httpd_state *s)) {
	PSOCK_BEGIN(&s->sout);

		PSOCK_SEND(&s->sout, s->file.data, s->len);

		PSOCK_END(&s->sout);
	}
	/*---------------------------------------------------------------------------*/
static void next_scriptstate(struct httpd_state *s) {
	char *p;
	p = strchr(s->scriptptr, ISO_nl) + 1;
	s->scriptlen -= (unsigned short) (p - s->scriptptr);
	s->scriptptr = p;
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(handle_script(struct httpd_state *s)) {
	char *ptr;

	PT_BEGIN(&s->scriptpt);

		while(s->file.len > 0) {

			/* Check if we should start executing a script. */
			if(*s->file.data == ISO_percent &&
					*(s->file.data + 1) == ISO_bang) {
				s->scriptptr = s->file.data + 3;
				s->scriptlen = s->file.len - 3;
				if(*(s->scriptptr - 1) == ISO_colon) {
					httpd_fs_open(s->scriptptr + 1, &s->file);
					PT_WAIT_THREAD(&s->scriptpt, send_file(s));
				} else {
					PT_WAIT_THREAD(&s->scriptpt,
							httpd_cgi(s->scriptptr)(s, s->scriptptr));
				}
				next_scriptstate(s);

				/* The script is over, so we reset the pointers and continue
				 sending the rest of the file. */
				s->file.data = s->scriptptr;
				s->file.len = s->scriptlen;
			} else {
				/* See if we find the start of script marker in the block of HTML
				 to be sent. */

				if(s->file.len > uip_mss()) {
					s->len = uip_mss();
				} else {
					s->len = s->file.len;
				}

				if(*s->file.data == ISO_percent) {
					ptr = strchr(s->file.data + 1, ISO_percent);
				} else {
					ptr = strchr(s->file.data, ISO_percent);
				}
				if(ptr != NULL &&
						ptr != s->file.data) {
					s->len = (int)(ptr - s->file.data);
					if(s->len >= uip_mss()) {
						s->len = uip_mss();
					}
				}
				PT_WAIT_THREAD(&s->scriptpt, send_part_of_file(s));
				s->file.data += s->len;
				s->file.len -= s->len;

			}
		}

		PT_END(&s->scriptpt);
	}
	/*---------------------------------------------------------------------------*/
static
PT_THREAD(send_headers(struct httpd_state *s, const char *statushdr)) {
	char *ptr;

	PSOCK_BEGIN(&s->sout);

		PSOCK_SEND_STR(&s->sout, statushdr);

		ptr = strrchr(s->filename, ISO_period);
		if(ptr == NULL) {
			PSOCK_SEND_STR(&s->sout, http_content_type_binary);
		} else if(strncmp(http_html, ptr, 5) == 0 ||
				strncmp(http_shtml, ptr, 6) == 0) {
			PSOCK_SEND_STR(&s->sout, http_content_type_html);
		} else if(strncmp(http_css, ptr, 4) == 0) {
			PSOCK_SEND_STR(&s->sout, http_content_type_css);
		} else if(strncmp(http_png, ptr, 4) == 0) {
			PSOCK_SEND_STR(&s->sout, http_content_type_png);
		} else if(strncmp(http_gif, ptr, 4) == 0) {
			PSOCK_SEND_STR(&s->sout, http_content_type_gif);
		} else if(strncmp(http_jpg, ptr, 4) == 0) {
			PSOCK_SEND_STR(&s->sout, http_content_type_jpg);
		} else {
			PSOCK_SEND_STR(&s->sout, http_content_type_plain);
		}
		PSOCK_END(&s->sout);
	}
	/*---------------------------------------------------------------------------*/
static
PT_THREAD(handle_output(struct httpd_state *s)) {
	char *ptr;

	PT_BEGIN(&s->outputpt);

		if(!httpd_fs_open(s->filename, &s->file)) {
			httpd_fs_open(http_404_html, &s->file);
			strcpy(s->filename, http_404_html);
			PT_WAIT_THREAD(&s->outputpt,
					send_headers(s,
							http_header_404));
			PT_WAIT_THREAD(&s->outputpt,
					send_file(s));
		} else {
			PT_WAIT_THREAD(&s->outputpt,
					send_headers(s,
							http_header_200));
			ptr = strchr(s->filename, ISO_period);
			if(ptr != NULL && strncmp(ptr, http_shtml, 6) == 0) {
				PT_INIT(&s->scriptpt);
				PT_WAIT_THREAD(&s->outputpt, handle_script(s));
			} else {
				PT_WAIT_THREAD(&s->outputpt,
						send_file(s));
			}
		}
		PSOCK_CLOSE(&s->sout);
		PT_END(&s->outputpt);
	}
	/*---------------------------------------------------------------------------*/
static
PT_THREAD(handle_input(struct httpd_state *s)) {
	PSOCK_BEGIN(&s->sin);

		PSOCK_READTO(&s->sin, ISO_space);

		if(strncmp(s->inputbuf, http_get, 4) != 0) {
			PSOCK_CLOSE_EXIT(&s->sin);
		}
		PSOCK_READTO(&s->sin, ISO_space);

		if(s->inputbuf[0] != ISO_slash) {
			PSOCK_CLOSE_EXIT(&s->sin);
		}

		if(s->inputbuf[1] == ISO_space) {
			strncpy(s->filename, http_index_html, sizeof(s->filename));
		} else {

			s->inputbuf[PSOCK_DATALEN(&s->sin) - 1] = 0;

			/* Process any form input being sent to the server. */
			{
				extern void vApplicationProcessFormInput( char *pcInputString, long xInputLength );
				vApplicationProcessFormInput( s->inputbuf, PSOCK_DATALEN(&s->sin) );
			}

			strncpy(s->filename, &s->inputbuf[0], sizeof(s->filename));
		}

		/*  httpd_log_file(uip_conn->ripaddr, s->filename);*/

		s->state = STATE_OUTPUT;

		while(1) {
			PSOCK_READTO(&s->sin, ISO_nl);

			if(strncmp(s->inputbuf, http_referer, 8) == 0) {
				s->inputbuf[PSOCK_DATALEN(&s->sin) - 2] = 0;
				/*      httpd_log(&s->inputbuf[9]);*/
			}
		}

		PSOCK_END(&s->sin);
	}
	/*---------------------------------------------------------------------------*/
static void handle_connection(struct httpd_state *s) {
	handle_input(s);
	if (s->state == STATE_OUTPUT) {
		handle_output(s);
	}
}
/*---------------------------------------------------------------------------*/
void httpd_appcall(void) {
	struct httpd_state *s = (struct httpd_state *) &(uip_conn->appstate);

	if (uip_closed() || uip_aborted() || uip_timedout()) {
	} else if (uip_connected()) {
		PSOCK_INIT(&s->sin, s->inputbuf, sizeof(s->inputbuf) - 1);
		PSOCK_INIT(&s->sout, s->inputbuf, sizeof(s->inputbuf) - 1);
		PT_INIT(&s->outputpt);
		s->state = STATE_WAITING;
		/*    timer_set(&s->timer, CLOCK_SECOND * 100);*/
		s->timer = 0;
		handle_connection(s);
	} else if (s != NULL) {
		if (uip_poll()) {
			++s->timer;
			if (s->timer >= 20) {
				uip_abort();
			}
		} else {
			s->timer = 0;
		}
		handle_connection(s);
	} else {
		uip_abort();
	}
}
/*---------------------------------------------------------------------------*/
/**
 * \brief      Initialize the web server
 *
 *             This function initializes the web server and should be
 *             called at system boot-up.
 */
void httpd_init(void) {
	uip_listen(HTONS(80));
	cam_podmienka=0;
}
/*---------------------------------------------------------------------------*/
/** @} */
