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

  Eurecom OpenAirInterface
  Copyright(c) 1999 - 2011 Eurecom

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

  This program is distributed in the hope 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.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information
  Openair Admin: openair_admin@eurecom.fr
  Openair Tech : openair_tech@eurecom.fr
  Forums       : http://forums.eurecom.fsr/openairinterface
  Address      : Eurecom, 2229, route des crêtes, 06560 Valbonne Sophia Antipolis, France

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

/*! \file OCG_detect_file.c
* \brief Detect if a new XML is generated from the web portal
* \author Lusheng Wang  & Navid Nikaein
* \date 2011
* \version 0.1
* \company Eurecom
* \email: lusheng.wang@eurecom.fr
* \note
* \warning
*/

/*--- INCLUDES ---------------------------------------------------------------*/
#include <stdio.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
#include "OCG_vars.h"
#include "OCG_detect_file.h"
#include "UTIL/LOG/log.h"
/*----------------------------------------------------------------------------*/


int detect_file(char src_dir[DIR_LENGTH_MAX], char is_local_server[FILENAME_LENGTH_MAX]) {
	DIR *dir = NULL; 
	struct dirent *file = NULL;
	char template[FILENAME_LENGTH_MAX] = "";
	char manual[FILENAME_LENGTH_MAX] = "";

	if((dir = opendir(src_dir)) == NULL) {
		LOG_E(OCG, "Folder %s for detecting the XML configuration file is not found\n", src_dir);
		return MODULE_ERROR;
	}

	while((file = readdir(dir)) != NULL) {
		if(strcmp(file->d_name, ".") && strcmp(file->d_name, "..")) {
			if(file->d_type != DT_DIR) {
				if ((!strcmp(is_local_server, "0")) || (!strcmp(is_local_server, "-1"))) { // for EURECOM web or local user without specifying the file name
					strncpy(template, file->d_name, sizeof("template") - 1);
					strncpy(manual, file->d_name, sizeof("manual") - 1);
					if ((!strcmp(template, "template")) || (!strcmp(manual, "manual"))) { // should skip the templates and the manual XML files
						
					} else {
						if (strlen(file->d_name) <= FILENAME_LENGTH_MAX) {
							strcpy(filename, file->d_name);
							LOG_I(OCG, "Configuration file \"%s\" is detected\n", filename);
							closedir(dir);
							return MODULE_OK; // find a good file and return
						} else {
							LOG_E(OCG, "File name too long: char filename[] should be less than 64 characters\n");
							closedir(dir);
							return MODULE_ERROR;
						}
					}
				} else { // should use a template or a manual XML file
					strncpy(template, is_local_server, sizeof("template") - 1);
					strncpy(manual, is_local_server, sizeof("manual") - 1);
					if ((!strcmp(template, "template")) || (!strcmp(manual, "manual"))) {
						strcpy(filename, is_local_server);
					} else {
						strcpy(filename, "template_");
						strcat(filename, is_local_server);
						strcat(filename, ".xml");
					}

					char check_src_file[FILENAME_LENGTH_MAX + DIR_LENGTH_MAX];
					strcpy(check_src_file, src_dir);
					strcat(check_src_file, filename);
					struct stat st;
					if(stat(check_src_file, &st) != 0) {
						LOG_E(OCG, "file %s does not exist\n", check_src_file);
						closedir(dir);
						return MODULE_ERROR;
					} else {
						LOG_I(OCG, "template/manual file \"%s\" is used\n", filename);
						closedir(dir);
						return MODULE_OK;
					}
				}
			} else { // this option is not used at this moment : NO directory should be put in the src_dir
			  //detect_file(strncat(src_dir, file->d_name, FILENAME_LENGTH_MAX + DIR_LENGTH_MAX));
			}
		}
	}

	closedir(dir);

	if (strcmp(is_local_server, "0") && strcmp(is_local_server, "-1")) {
		LOG_E(OCG, "file %s does not exist in directory %s\n", is_local_server, src_dir);
		return MODULE_ERROR;
	} else return NO_FILE;
}