/**

 * GMyth Library

 *

 * @file gmyth/gmyth_util.c

 * 

 * @brief <p> This component provides utility functions.

 * 

 * Copyright (C) 2006 INdT - Instituto Nokia de Tecnologia.

 * @author Hallyson Luiz de Morais Melo <hallyson.melo@indt.org.br>

 *

 *//*

 * 

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * 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 Lesser 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

 */

 #ifdef HAVE_CONFIG_H

 #include "config.h"

 #endif

 #define _XOPEN_SOURCE

 #define _XOPEN_SOURCE_EXTENDED

 #define __USE_MISC

 #include <glib.h>

 #include <glib/gprintf.h>

 #include <time.h>

 #include <sys/time.h>

 #include <sys/timex.h>

 #include "gmyth.h"

 #if !GLIB_CHECK_VERSION (2, 10, 0)

 gchar *

 g_time_val_to_iso8601 (GTimeVal *time_);

 gboolean

 g_time_val_from_iso8601 (const gchar *iso_date,

                          GTimeVal    *time_);

 void

 g_date_set_time_val (GDate    *date,

              GTimeVal *timeval);

 #endif

 static GStaticMutex mutex = G_STATIC_MUTEX_INIT;

 /** Converts a time_t struct in a GString at ISO standard format 

  * (e.g. 2006-07-20T09:56:41).

  * 

  * The returned GString memory should be deallocated from 

  * the calling function.

  *

  * @param time_value the time value to be converted

  * @return GString* the converted isoformat string 

  */

 GString*

 gmyth_util_time_to_isoformat (time_t time_value)

 {

 	struct tm tm_time;

 	GString *result;

 	g_static_mutex_lock ( &mutex );

 	if (localtime_r(&time_value, &tm_time) == NULL) {

 	    g_static_mutex_unlock ( &mutex );

 	    g_warning ("gmyth_util_time_to_isoformat convertion error!\n");

             return NULL;

 	}

 	result = g_string_sized_new(20);

 	g_string_printf(result, "%04d-%02d-%02dT%02d:%02d:%02d",

 		tm_time.tm_year + 1900, tm_time.tm_mon + 1, tm_time.tm_mday,

 		tm_time.tm_hour, tm_time.tm_min, tm_time.tm_sec);

 	gmyth_debug( "Result (ISO 8601) = %s", result->str );

 	g_static_mutex_unlock ( &mutex );

 	return result;

 }

 /** Converts a time_t struct in a GString at ISO standard format 

  * (e.g. 2006-07-20T09:56:41).

  * 

  * The returned GString memory should be deallocated from 

  * the calling function.

  *

  * @param time_value the GTimeValue to be converted

  * @return GString* the converted isoformat string 

  */

 gchar*

 gmyth_util_time_to_isoformat_from_time_val_fmt ( const gchar *fmt_string, const GTimeVal* time_val )

 {

 	gchar *result = NULL;

 	struct tm *tm_time = NULL;

 	gint buffer_len = 0;

 	g_return_val_if_fail( fmt_string != NULL, NULL );

 	g_return_val_if_fail( time_val != NULL, NULL );

 	time_t time = time_val->tv_sec;// + (gint)( time_val->tv_usec / G_USEC_PER_SEC );

 	tm_time = g_malloc0( sizeof(struct tm) );

 	g_static_mutex_lock ( &mutex );

 	if ( NULL == localtime_r( &time, tm_time ) ) {

 		g_warning ("gmyth_util_time_to_isoformat convertion error!\n");

 	}	else {

 		// we first check the return of strftime to allocate a buffer of the correct size

 	  buffer_len = strftime( NULL, SSIZE_MAX, fmt_string, tm_time );

 	  if ( buffer_len > 0 ) {

 	    result = g_malloc0( buffer_len + 1 );

 	    if( result == NULL ){

 				g_static_mutex_unlock ( &mutex );

 				g_warning ("gmyth_util_time_to_isoformat convertion error!\n");

 				return NULL;

 	    }

 	    strftime( result, buffer_len + 1, fmt_string, tm_time );

 	    gmyth_debug( "Dateline (ISO result): %s", result );

 	  }

 	}

 	gmyth_debug( "Result (strftime) = %s", result );

 	//strptime( result, "%Y-%m-%dT%H:%M:%SZ", tm_time ); 

 	//strftime( result, strlen(result), fmt_string, tm_time );

 	g_static_mutex_unlock ( &mutex );

 	gmyth_debug( "Result (ISO 8601) = %s", result  );

 	return result;	

 }

 /** Converts a time_t struct in a GString at ISO standard format 

  * (e.g. 2006-07-20 09:56:41).

  * 

  * The returned GString memory should be deallocated from 

  * the calling function.

  *

  * @param time_value the GTimeValue to be converted

  * @return GString* the converted isoformat string 

  */

 gchar*

 gmyth_util_time_to_isoformat_from_time_val ( const GTimeVal* time )

 {

 	gchar *result = gmyth_util_time_to_isoformat_from_time_val_fmt( "%Y-%m-%d %H:%M:%S", time );

 	//result[10] = ' ';

 	//result[ strlen(result) - 1] = '\0';

 	return result;	

 }

 /** Converts a time_t struct in a GString at ISO standard format 2 

  * (e.g. 2006-07-20T09:56:41).

  * 

  * The returned GString memory should be deallocated from 

  * the calling function.

  *

  * @param time_value the GTimeValue to be converted

  * @return GString* the converted isoformat string 

  */

 gchar*

 gmyth_util_time_to_mythformat_from_time_val ( const GTimeVal* time )

 {

 	gchar *result = gmyth_util_time_to_isoformat_from_time_val_fmt( "%Y-%m-%dT%H:%M:%S", time );

 	return result;	

 }

 /** Converts a time_t struct in a GString at ISO standard format 

  * (e.g. 2006-07-20T09:56:41).

  * 

  * The returned GString memory should be deallocated from 

  * the calling function.

  *

  * @param time_value the GTimeValue to be converted

  * @return GString* the converted isoformat string 

  */

 gchar*

 gmyth_util_time_to_string_only_date ( const GTimeVal* time )

 {

 	gchar *result = gmyth_util_time_to_isoformat_from_time_val_fmt( "%Y-%m-%d", time );

 	//result[10] = ' ';

 	//result[ strlen(result) - 1] = '\0';

 	return result;

 }

 /** Converts a time_t struct in a GString at ISO standard format 

  * (e.g. 2006-07-20T09:56:41).

  * 

  * The returned GString memory should be deallocated from 

  * the calling function.

  *

  * @param time_value the GTimeValue to be converted

  * @return GString* the converted isoformat string 

  */

 gchar*

 gmyth_util_time_to_string_only_time ( const GTimeVal* time )

 {

 	gchar *result = gmyth_util_time_to_isoformat_from_time_val_fmt( "%H:%M:%S", time );	 

 	//result[10] = ' ';

 	//result[ strlen(result) - 1] = '\0';

 	return result;

 }

 /** Converts a time_t struct in a GString to the following 

  * format (e.g. 2006-07-20 09:56:41).

  * 

  * The returned GString memory should be deallocated from 

  * the calling function.

  *

  * @param time_value the time value to be converted

  * @return GString* the converted string 

  */

 GString*

 gmyth_util_time_to_string (time_t time_value)

 {

 	GString *result = gmyth_util_time_to_isoformat (time_value);

 	result->str[10] = ' ';	

 	result->str[ strlen(result->str) - 1] = '\0';

 	return result;

 }

 /** Converts a time_t struct in a GString to the following 

  * format (e.g. 2006-07-20 09:56:41).

  * 

  * The returned GString memory should be deallocated from 

  * the calling function.

  *

  * @param time_value the time value to be converted

  * @return GString* the converted string 

  */

 gchar*

 gmyth_util_time_to_string_from_time_val ( const GTimeVal *time_val )

 {

 	gchar *result = gmyth_util_time_to_isoformat_from_time_val_fmt ( "%Y-%m-%d %H:%M:%S", time_val );

 	//result[10] = ' ';

 	return result;

 }

 /** Converts a GString in the following format 

  * (e.g. 2006-07-20 09:56:41) to a time_t struct.

  * 

  * @param time_str the string to be converted

  * @return time_t the time converted value

  */

 time_t

 gmyth_util_string_to_time (GString* time_str)

 {

 	gint year, month, day, hour, min, sec;

 	gmyth_debug( "[%s] time_str = %s. [%s]", __FUNCTION__, time_str != NULL ? 

 					time_str->str : "[time string is NULL!]", time_str->str );

 	if ( sscanf (time_str->str, "%04d-%02d-%02d %02d:%02d:%02d",

 			&year, &month, &day, &hour, &min, &sec) < 3 ) {

 		g_warning ("GMythUtil: isoformat_to_time converter error!\n");

 		return 0;

 	}

 	g_static_mutex_lock ( &mutex );

 	struct tm* tm_time = g_malloc0( sizeof(struct tm) );

 	tm_time->tm_year = year - 1900;

 	tm_time->tm_mon = month - 1;

 	tm_time->tm_mday = day;

 	tm_time->tm_hour = hour;

 	tm_time->tm_min = min;

 	tm_time->tm_sec = sec;

 	g_static_mutex_unlock ( &mutex );

 	return mktime( tm_time );

 }

 /** Converts a GString in the following format 

  * (e.g. 2006-07-20 09:56:41) to a time_t struct.

  * 

  * @param time_str the string to be converted

  * @return time_t the time converted value

  */

 struct tm*

 gmyth_util_time_val_to_date ( const GTimeVal* time )

 {

 	struct tm *date = g_malloc0( sizeof( struct tm ) );

 	time_t time_micros = time->tv_sec;// + (gint)( time->tv_usec / G_USEC_PER_SEC );

   if ( NULL == date ) { 

 		g_warning ( "GMythUtil: GDate *gmyth_util_time_val_to_date (GTimeVal* time) - converter error!\n" );

 		return NULL;

 	}

 	if ( NULL == localtime_r( &time_micros, date ) ) {

 		g_warning ( "gmyth_util_time_to_isoformat convertion error!\n" );

 		return NULL;

 	}

 	gmyth_debug( "Converted from GTimeVal == %s to GDate", asctime( date ) );

 	return date;

 }

 /** Converts a GString in the following format 

  * (e.g. 2006-07-20 09:56:41) to a time_t struct.

  * 

  * @param time_str the string to be converted

  * @return time_t the time converted value

  */

 GTimeVal*

 gmyth_util_string_to_time_val_fmt ( const gchar *fmt_string, const gchar* time_str )

 {

 	GTimeVal *time = g_new0( GTimeVal, 1 );

 	struct tm* tm_time = NULL;

 	time_t time_micros;

 	gint result;

 	gmyth_debug( "[%s] time_str = %s. [%s]", time_str, time_str != NULL ? 

 					time_str : "[time string is NULL!]", time_str );

 	if ( NULL == time_str ) 

 	{ 

 		g_warning ("GMythUtil: isoformat_to_time converter error!\n");

 		return NULL;

 	}

 	g_static_mutex_lock ( &mutex );

 	tm_time = g_malloc0( sizeof(struct tm) );

 	/* we first check the return of strftime to allocate a buffer of the correct size */

   result = strptime( time_str, "%Y-%m-%dT%H:%M:%S", tm_time );

   if ( NULL == result ) {

 		/* we first check the return of strftime to allocate a buffer of the correct size */

 	  result = strptime( time_str, "%Y-%m-%dT%H:%M:%SZ", tm_time );

 	  if ( NULL == result ) {

 	  	/* we first check the return of strftime to allocate a buffer of the correct size */

 		  result = strptime( time_str, "%Y-%m-%d %H:%M:%S", tm_time );

 		  if ( NULL == result ) {

 		  	g_static_mutex_unlock ( &mutex );

 		    gmyth_debug( "Dateline (ISO result): %s", result );

 		    time = NULL;

 		    //goto done;	    

 		  }

 	  }

   }

   time_micros = mktime( tm_time );

 	time->tv_sec = time_micros; // + (gint)( time_val->tv_usec / G_USEC_PER_SEC );

 	gmyth_debug( "After mktime call... = %s", asctime(tm_time) );

 	g_static_mutex_unlock ( &mutex );

 	return time;

 }

 /** Converts a GString in the following format 

  * (e.g. 2006-07-20 09:56:41) to a time_t struct.

  * 

  * @param time_str the string to be converted

  * @return time_t the time converted value

  */

 GTimeVal*

 gmyth_util_string_to_time_val ( const gchar* time_str )

 {

 	GTimeVal *time = gmyth_util_string_to_time_val_fmt ( "%Y-%m-%d %H:%M:%S", time_str );	

 	return time;

 }

 /** Decodes a long long variable from the string list

  * format of the myhtprotocol.

  * 

  * @param strlist the string list of mythprotocol values

  * @param offset  the list node offset of the long long variable

  * @return gint64  the long long converted value

  */

 gint64

 gmyth_util_decode_long_long(GMythStringList *strlist, guint offset) 

 {

 	gint64 ret_value = 0LL;

 	g_return_val_if_fail( strlist != NULL, ret_value );

 	if ( offset > gmyth_string_list_length( strlist ))

 		g_printerr( "[%s] Offset is greater than the Stringlist (offset = %d)!\n", 

                     __FUNCTION__, offset );

 	g_return_val_if_fail( offset < gmyth_string_list_length( strlist ), ret_value );

 	gint l1 = gmyth_string_list_get_int( strlist, offset );

 	gint l2 = gmyth_string_list_get_int( strlist, offset + 1 );

 	ret_value = (l2 /*& 0xffffffffLL*/) | ( (gint64)l1 << 32 );

 	return ret_value;

 }

 gboolean

 gmyth_util_file_exists (GMythBackendInfo *backend_info, const gchar* filename)

 {

     GMythSocket *socket;

     gboolean res;

     socket = gmyth_socket_new ();

     res = gmyth_socket_connect_to_backend (socket, backend_info->hostname,

 		    backend_info->port, TRUE);

     if (res == TRUE) {

         GMythStringList *slist;

         GMythProgramInfo *program = NULL;

         program = gmyth_program_info_new();

         program->pathname = g_string_new (filename);

         slist = gmyth_string_list_new ();

         gmyth_string_list_append_char_array (slist, "QUERY_CHECKFILE");

         gmyth_program_info_to_string_list (program, slist);

         gmyth_socket_sendreceive_stringlist (socket, slist);

         res = (gmyth_string_list_get_int (slist, 0) == 1);

         g_object_unref (program);

         g_object_unref (slist);

         gmyth_socket_close_connection (socket);

     }

     g_object_unref (socket);

     return res;    

 }

 #if !GLIB_CHECK_VERSION (2, 10, 0)

 /* Hacked from glib 2.10 <gtime.c> */

 static time_t

 mktime_utc (struct tm *tm)

 {

   time_t retval;

 #ifndef HAVE_TIMEGM

   static const gint days_before[] =

   {

     0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334

   };

 #endif

 #ifndef HAVE_TIMEGM

   if (tm->tm_mon < 0 || tm->tm_mon > 11)

     return (time_t) -1;

   retval = (tm->tm_year - 70) * 365;

   retval += (tm->tm_year - 68) / 4;

   retval += days_before[tm->tm_mon] + tm->tm_mday - 1;

   if (tm->tm_year % 4 == 0 && tm->tm_mon < 2)

     retval -= 1;

   retval = ((((retval * 24) + tm->tm_hour) * 60) + tm->tm_min) * 60 + tm->tm_sec;

 #else

   retval = timegm (tm);

 #endif /* !HAVE_TIMEGM */

   return retval;

 }

 gboolean

 g_time_val_from_iso8601 (const gchar *iso_date,

                          GTimeVal    *time_)

 {

   struct tm tm;

   long val;

   g_return_val_if_fail (iso_date != NULL, FALSE);

   g_return_val_if_fail (time_ != NULL, FALSE);

   val = strtoul (iso_date, (char **)&iso_date, 10);

   if (*iso_date == '-')

     {

       /* YYYY-MM-DD */

       tm.tm_year = val - 1900;

       iso_date++;

       tm.tm_mon = strtoul (iso_date, (char **)&iso_date, 10) - 1;

       if (*iso_date++ != '-')

         return FALSE;

       tm.tm_mday = strtoul (iso_date, (char **)&iso_date, 10);

     }

   else

     {

       /* YYYYMMDD */

       tm.tm_mday = val % 100;

       tm.tm_mon = (val % 10000) / 100 - 1;

       tm.tm_year = val / 10000 - 1900;

     }

   if (*iso_date++ != 'T')

     return FALSE;

   val = strtoul (iso_date, (char **)&iso_date, 10);

   if (*iso_date == ':')

     {

       /* hh:mm:ss */

       tm.tm_hour = val;

       iso_date++;

       tm.tm_min = strtoul (iso_date, (char **)&iso_date, 10);

       if (*iso_date++ != ':')

         return FALSE;

       tm.tm_sec = strtoul (iso_date, (char **)&iso_date, 10);

     }

   else

     {

       /* hhmmss */

       tm.tm_sec = val % 100;

       tm.tm_min = (val % 10000) / 100;

       tm.tm_hour = val / 10000;

     }

   time_->tv_sec = mktime_utc (&tm);

   time_->tv_usec = 1;

   if (*iso_date == '.')

     time_->tv_usec = strtoul (iso_date + 1, (char **)&iso_date, 10);

   if (*iso_date == '+' || *iso_date == '-')

     {

       gint sign = (*iso_date == '+') ? -1 : 1;

       val = 60 * strtoul (iso_date + 1, (char **)&iso_date, 10);

       if (*iso_date == ':')

     val = 60 * val + strtoul (iso_date + 1, NULL, 10);

       else

         val = 60 * (val / 100) + (val % 100);

       time_->tv_sec += (time_t) (val * sign);

     }

   return TRUE;

 }

 gchar *

 g_time_val_to_iso8601 (GTimeVal *time_)

 {

   gchar *retval;

   g_return_val_if_fail (time_->tv_usec >= 0 && time_->tv_usec < G_USEC_PER_SEC, NULL);

 #define ISO_8601_LEN    21

 #define ISO_8601_FORMAT "%Y-%m-%dT%H:%M:%SZ"

   retval = g_new0 (gchar, ISO_8601_LEN + 1);

   strftime (retval, ISO_8601_LEN,

         ISO_8601_FORMAT,

         gmtime (&(time_->tv_sec)));

   return retval;

 }

 /* Hacked from glib 2.10 <gdate.c> */

 void         

 g_date_set_time_t (GDate *date,

            time_t timet)

 {

   struct tm tm;

   g_return_if_fail (date != NULL);

 #ifdef HAVE_LOCALTIME_R

   localtime_r (&timet, &tm);

 #else

   {

     struct tm *ptm = localtime (&timet);

     if (ptm == NULL)

       {

     /* Happens at least in Microsoft's C library if you pass a

      * negative time_t. Use 2000-01-01 as default date.

      */

 #ifndef G_DISABLE_CHECKS

     g_return_if_fail_warning (G_LOG_DOMAIN, "g_date_set_time", "ptm != NULL");

 #endif

     tm.tm_mon = 0;

     tm.tm_mday = 1;

     tm.tm_year = 100;

       }

     else

       memcpy ((void *) &tm, (void *) ptm, sizeof(struct tm));

   }

 #endif

   date->julian = FALSE;

   date->month = tm.tm_mon + 1;

   date->day   = tm.tm_mday;

   date->year  = tm.tm_year + 1900;

   g_return_if_fail (g_date_valid_dmy (date->day, date->month, date->year));

   date->dmy    = TRUE;

 }

 void

 g_date_set_time_val (GDate    *date,

              GTimeVal *timeval)

 {

   g_date_set_time_t (date, (time_t) timeval->tv_sec);

 }

 #endif