/*
 * Copyright (C) 2002 Philip Blundell <philb@gnu.org>
 *
 * 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.
 */

#include <glib.h>
#include <assert.h>
#include <string.h>

#include "playlist_db.h"

static struct playlist *
playlist_fetch_item_internal (struct playlist *l, int *idx)
{
  struct playlist *v = NULL;
  GSList *i;

  switch (l->type)
    {
    case ITEM_TYPE_TRACK:
      if (*idx == 0)
	v = l;
      else
	(*idx)--;
      break;

    case ITEM_TYPE_LIST:
      i = l->data.list;
      while (v == NULL && i != NULL)
	{
	  struct playlist *p = i->data;
	  v = playlist_fetch_item_internal (p, idx);
	  i = i->next;
	}
      break;
    }

  return v;
}

struct playlist *
playlist_fetch_item (struct playlist *l, guint idx)
{
  return playlist_fetch_item_internal (l, &idx);
}

int
playlist_get_length (struct playlist *l)
{
  struct playlist *v = NULL;
  GSList *i;
  int length = 0;

  if (!l)
    return 0;

  if (l->type != ITEM_TYPE_LIST)
    return 1;

  i = l->data.list;
  while (v == NULL && i != NULL)
    {
      struct playlist *p = i->data;
      switch (p->type) 
	{
	case ITEM_TYPE_TRACK:
	  length++;
	  break;
	case ITEM_TYPE_LIST:
	  length += playlist_get_length (p);
	  break;
	}
      i = i->next;
    }

  return length;
}

struct playlist *
playlist_new_list (void)
{
  struct playlist *i = g_malloc (sizeof (struct playlist));
  memset (i, 0, sizeof (*i));
  i->type = ITEM_TYPE_LIST;
  return i;
}

struct playlist *
playlist_new_track (void)
{
  struct playlist *i = g_malloc (sizeof (struct playlist));
  memset (i, 0, sizeof (*i));
  i->type = ITEM_TYPE_TRACK;
  return i;
}


void playlist_free (struct playlist *playlist)
{
  if (playlist) {
    g_free(playlist->title);
    
    if (playlist->type == ITEM_TYPE_LIST) {
      /* free the children */
      g_slist_foreach(playlist->data.list, playlist_free, NULL);
      g_slist_free(playlist->data.list);
    } else {
      // these three cause gpe-nmf to hang
      //g_free(playlist->data.track.url);
      //g_free(playlist->data.track.artist);
      //g_free(playlist->data.track.album);
    }
    g_free(playlist);
  }
}