/* 
 * $Id$
 *
 * Based on mpc's songToFormatedString modified for glib and ncmpc
 *
 *
 * (c) 2003-2004 by normalperson and Warren Dukes (shank@mercury.chem.pitt.edu)
 *              and Daniel Brown (danb@cs.utexas.edu)
 *              and Kalle Wallin (kaw@linux.se)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU 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 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
 */


#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <glib.h>

#include "config.h"
#include "libmpdclient.h"
#include "support.h"
#include "strfsong.h"

static gchar * 
skip(gchar * p) 
{
  gint stack = 0;
 
  while (*p != '\0') {
    if(*p == '[') stack++;
    if(*p == '#' && p[1] != '\0') {
      /* skip escaped stuff */
      ++p;
    }
    else if(stack) {
      if(*p == ']') stack--;
    }
    else {
      if(*p == '&' || *p == '|' || *p == ']') {
	break;
      }
    }
    ++p;
  }

  return p;
}

static gsize
_strfsong(gchar *s, 
	  gsize max, 
	  const gchar *format, 
	  mpd_Song *song, 
	  gchar **last)
{
  gchar *p, *end;
  gchar *temp;
  gsize n, length = 0;
  gboolean found = FALSE;

  memset(s, 0, max);
  if( song==NULL )
    return 0;
  
  for( p=(gchar *) format; *p != '\0' && length<max; )
    {
      /* OR */
      if (p[0] == '|') 
	{
	  ++p;
	  if(!found) 
	    {
	      memset(s, 0, max);
	      length = 0;
	    }
	  else 
	    {
	      p = skip(p);
	    }
	  continue;
	}

      /* AND */
      if (p[0] == '&') 
	{
	  ++p;
	  if(!found) 
	    {
	      p = skip(p);
	    }
	  else 
	    {
	      found = FALSE;
	    }
	  continue;
	}

      /* EXPRESSION START */
      if (p[0] == '[')
	{
	  temp = g_malloc0(max);
	  if( _strfsong(temp, max, p+1, song, &p) >0 )
	    {
	      g_strlcat(s, temp, max);
	      length = strlen(s);
	      found = TRUE;
	    }
	  g_free(temp);
	  continue;
	}

      /* EXPRESSION END */
      if (p[0] == ']')
	{
	  if(last) *last = p+1;
	  if(!found && length) 
	    {
	      memset(s, 0, max);
	      length = 0;
	    }
	  return length;
	}

      /* pass-through non-escaped portions of the format string */
      if (p[0] != '#' && p[0] != '%' && length<max)
	{
	  s[length++] = *p;
	  p++;
	  continue;
	}

      /* let the escape character escape itself */
      if (p[0] == '#' && p[1] != '\0' && length<max)
	{
	  s[length++] = *(p+1);
	  p+=2;
	  continue;
	}

      /* advance past the esc character */

      /* find the extent of this format specifier (stop at \0, ' ', or esc) */
      temp = NULL;
      end  = p+1;
      while(*end >= 'a' && *end <= 'z')
	{
	  end++;
	}
      n = end - p + 1;
      if(*end != '%')
	n--;
      else if (strncmp("%file%", p, n) == 0)
	temp = utf8_to_locale(song->file);
      else if (strncmp("%artist%", p, n) == 0)
	temp = song->artist ? utf8_to_locale(song->artist) : NULL;
      else if (strncmp("%title%", p, n) == 0)
	temp = song->title ? utf8_to_locale(song->title) : NULL;
      else if (strncmp("%album%", p, n) == 0)
	temp = song->album ? utf8_to_locale(song->album) : NULL;
      else if (strncmp("%shortalbum%", p, n) == 0)
	{
	  temp = song->album ? utf8_to_locale(song->album) : NULL;
	  if (temp)
	    {
	      gchar *temp2 = g_strndup(temp, 25);
	      if (strlen(temp) > 25)
		{
		  temp2[24] = '.';
		  temp2[23] = '.';
		  temp2[22] = '.';
		}
	      g_free(temp);
	      temp = temp2;
	    }
	}
      else if (strncmp("%track%", p, n) == 0)
	temp = song->track ? utf8_to_locale(song->track) : NULL;
      else if (strncmp("%name%", p, n) == 0)
	temp = song->name ? utf8_to_locale(song->name) : NULL;
      else if (strncmp("%date%", p, n) == 0)
	temp = song->date ? utf8_to_locale(song->date) : NULL;
      else if (strncmp("%genre%", p, n) == 0)
	temp = song->genre ? utf8_to_locale(song->genre) : NULL;
      else if (strncmp("%shortfile%", p, n) == 0)
	{
	  if( strstr(song->file, "://") )
	    temp = utf8_to_locale(song->file);
	  else
	    temp = utf8_to_locale(basename(song->file));
	}
      else if (strncmp("%time%", p, n) == 0)
	{
	  if (song->time != MPD_SONG_NO_TIME) 
	    temp = g_strdup_printf("%d:%02d", 
				   song->time / 60, 
				   song->time % 60 + 1);
	}

      if( temp == NULL)
	{
	  gsize templen=n;
	  /* just pass-through any unknown specifiers (including esc) */
	  /* drop a null char in so printf stops at the end of this specifier,
	     but put the real character back in (pseudo-const) */
	  if( length+templen > max )
	    templen = max-length;
	  g_strlcat(s, p,max);
	  length+=templen;
	}
      else {
	gsize templen = strlen(temp);

	found = TRUE;
	if( length+templen > max )
	  templen = max-length;
	g_strlcat(s, temp, max);
	length+=templen;
	g_free(temp);
      }

      /* advance past the specifier */
      p += n;
    }

  if(last) *last = p;

  return length;
}

gsize
strfsong(gchar *s, gsize max, const gchar *format, mpd_Song *song)
{
  return _strfsong(s, max, format, song, NULL);
}