/*****************************************************************************
 * m3u.c : M3U playlist format import
 *****************************************************************************
 * Copyright (C) 2004 VideoLAN
 * $Id$
 *
 * Authors: Clément Stenac <zorglub@videolan.org>
 * Authors: Sigmund Augdal <sigmunau@idi.ntnu.no>
 *
 * 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, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>                                      /* malloc(), free() */

#include <vlc/vlc.h>
#include <vlc/input.h>
#include <vlc/intf.h>

#include <errno.h>                                                 /* ENOMEM */
#include "playlist.h"

struct demux_sys_t
{
    char *psz_prefix;
};

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int Demux( demux_t *p_demux);
static int Control( demux_t *p_demux, int i_query, va_list args );

/*****************************************************************************
 * Import_M3U: main import function
 *****************************************************************************/
int Import_M3U( vlc_object_t *p_this )
{
    demux_t *p_demux = (demux_t *)p_this;

    uint8_t *p_peek;
    char    *psz_ext;

    if( stream_Peek( p_demux->s , &p_peek, 7 ) < 7 )
    {
        return VLC_EGENERIC;
    }
    psz_ext = strrchr ( p_demux->psz_path, '.' );

    if( !strncmp( p_peek, "#EXTM3U", 7 ) )
    {
        ;
    }
    else if( ( psz_ext && !strcasecmp( psz_ext, ".m3u") ) ||
             ( psz_ext && !strcasecmp( psz_ext, ".ram") ) ||
             /* A .ram file can contain a single rtsp link */
             ( p_demux->psz_demux && !strcmp(p_demux->psz_demux, "m3u") ) )
    {
        ;
    }
    else
    {
        return VLC_EGENERIC;
    }
    msg_Dbg( p_demux, "found valid M3U playlist file");

    p_demux->pf_control = Control;
    p_demux->pf_demux = Demux;
    p_demux->p_sys = malloc( sizeof(demux_sys_t) );
    if( p_demux->p_sys == NULL )
    {
        msg_Err( p_demux, "Out of memory" );
        return VLC_ENOMEM;
    }
    p_demux->p_sys->psz_prefix = FindPrefix( p_demux );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Deactivate: frees unused data
 *****************************************************************************/
void Close_M3U( vlc_object_t *p_this )
{
    demux_t *p_demux = (demux_t *)p_this;

    if( p_demux->p_sys->psz_prefix ) free( p_demux->p_sys->psz_prefix );
    free( p_demux->p_sys );
}

static int Demux( demux_t *p_demux )
{
    playlist_t *p_playlist;
    char       *psz_line;
    int        i_position;

    char *psz_name = NULL;
    mtime_t i_duration = -1;
    char **ppsz_options = NULL;
    int i_options = 0;

    vlc_bool_t b_cleanup = VLC_FALSE;

    p_playlist = (playlist_t *) vlc_object_find( p_demux, VLC_OBJECT_PLAYLIST,
                                                 FIND_PARENT );
    if( !p_playlist )
    {
        msg_Err( p_demux, "can't find playlist" );
        return -1;
    }

    vlc_mutex_lock( &p_playlist->object_lock );
    p_playlist->pp_items[p_playlist->i_index]->b_autodeletion = VLC_TRUE;
    i_position = p_playlist->i_index + 1;
    vlc_mutex_unlock( &p_playlist->object_lock );

    psz_line = stream_ReadLine( p_demux->s );
    while( psz_line )
    {
        char *psz_parse = psz_line;

        /* Skip leading tabs and spaces */
        while( *psz_parse == ' ' || *psz_parse == '\t' ||
               *psz_parse == '\n' || *psz_parse == '\r' ) psz_parse++;

        if( *psz_parse == '#' )
        {
            /* Parse extra info */

            /* Skip leading tabs and spaces */
            while( *psz_parse == ' ' || *psz_parse == '\t' || 
                   *psz_parse == '\n' || *psz_parse == '\r' ||
                   *psz_parse == '#' ) psz_parse++;

            if( !*psz_parse ) goto error;

            if( !strncasecmp( psz_parse, "EXTINF:", sizeof("EXTINF:") -1 ) )
            {
                /* Extended info */
                char *psz_duration;
                psz_parse += sizeof("EXTINF:") - 1;
                while( *psz_parse == '\t' || *psz_parse == ' ' ) psz_parse++;

                psz_duration = psz_parse;
                psz_parse = strchr( psz_parse, ',' );
                if( psz_parse )
                {
                    *psz_parse = '\0';
                    psz_parse++;
                    psz_name = strdup( psz_parse );
                    i_duration = atoi( psz_duration );
                    if( i_duration != -1 ) i_duration *= 1000000;
                }
            }
            else if( !strncasecmp( psz_parse, "EXTVLCOPT:",
                                   sizeof("EXTVLCOPT:") -1 ) )

            {
                /* VLC Option */
                char *psz_option;
                psz_parse += sizeof("EXTVLCOPT:") -1;
                if( !*psz_parse ) goto error;

                psz_option = strdup( psz_parse );
                if( psz_option )
                    INSERT_ELEM( ppsz_options, i_options, i_options,
                                 psz_option );
            }
        }
        else if( *psz_parse )
        {
            char *psz_mrl =
                ProcessMRL( psz_parse, p_demux->p_sys->psz_prefix );

            b_cleanup = VLC_TRUE;
            if( !psz_mrl ) goto error;

            playlist_AddExt( p_playlist, psz_mrl, psz_name,
                             PLAYLIST_INSERT, i_position, i_duration,
                             (const char **)ppsz_options, i_options );

            i_position++;
            free( psz_mrl );
        }

 error:

        /* Fetch another line */
        free( psz_line );
        psz_line = stream_ReadLine( p_demux->s );
        if( !psz_line ) b_cleanup = VLC_TRUE;

        if( b_cleanup )
        {
            /* Cleanup state */
            while( i_options-- ) free( ppsz_options[i_options] );
            if( ppsz_options ) free( ppsz_options );
            ppsz_options = NULL; i_options = 0;
            if( psz_name ) free( psz_name );
            psz_name = NULL;
            i_duration = -1;

            b_cleanup = VLC_FALSE;
        }
    }

    vlc_object_release( p_playlist );
    return VLC_SUCCESS;
}

static int Control( demux_t *p_demux, int i_query, va_list args )
{
    return VLC_EGENERIC;
}
