/**

 * $Id$

 *

 * GD-Rom list manager - maintains the list of recently accessed images and

 * available devices for the UI + config. 

 *

 * Copyright (c) 2005 Nathan Keynes.

 *

 * 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.

 */

#include <string.h>

#include <stdlib.h>

#include <glib.h>

#include <libgen.h>

#include "gettext.h"

#include "gdrom/gdrom.h"

#include "drivers/cdrom/drive.h"

#include "gdlist.h"

#include "lxdream.h"

#include "config.h"

#define MAX_RECENT_ITEMS 5

#define FIRST_RECENT_INDEX (gdrom_device_count+2)

DEFINE_HOOK(gdrom_list_change_hook, gdrom_list_change_hook_t);

static GList *gdrom_device_list = NULL;

static GList *gdrom_recent_list = NULL;

static unsigned int gdrom_device_count = 0, gdrom_recent_count = 0;

gint gdrom_list_find( const gchar *name )

{

    gint posn = 0;

    GList *ptr;

    for( ptr = gdrom_device_list; ptr != NULL; ptr = g_list_next(ptr) ) {

        cdrom_drive_t device = (cdrom_drive_t)ptr->data;

        posn++;

        if( strcmp(device->name, name) == 0 ) {

            return posn;

        }

    }

    posn++;

    for( ptr = gdrom_recent_list; ptr != NULL; ptr = g_list_next(ptr) ) {

        gchar *file = (gchar *)ptr->data;

        posn++;

        if( strcmp(file, name) == 0 ) {

            return posn;

        }

    }

    return -1;

}

/**

 * Update the recent list in the lxdream config (but does not save)  

 */

void gdrom_list_update_config()

{

    lxdream_set_global_config_list_value( CONFIG_RECENT, gdrom_recent_list ); 

}

void gdrom_list_add_recent_item( const gchar *name )

{

    gdrom_recent_list = g_list_prepend( gdrom_recent_list, g_strdup(name) );

    if( g_list_length(gdrom_recent_list) > MAX_RECENT_ITEMS ) {

        GList *ptr = g_list_nth( gdrom_recent_list, MAX_RECENT_ITEMS );

        g_free( ptr->data );

        gdrom_recent_list = g_list_remove( gdrom_recent_list, ptr->data );

    } else {

        gdrom_recent_count ++;

    }

    gdrom_list_update_config();

}

void gdrom_list_move_to_front( const gchar *name )

{

    GList *ptr;

    for( ptr = gdrom_recent_list; ptr != NULL; ptr = g_list_next(ptr) ) {

        gchar *file = (gchar *)ptr->data;

        if( strcmp(file, name) == 0 ) {

            gdrom_recent_list = g_list_delete_link( gdrom_recent_list, ptr );

            gdrom_recent_list = g_list_prepend( gdrom_recent_list, file );

            gdrom_list_update_config();

            return;

        }

    }

}

/**

 * Disc-changed callback from the GD-Rom driver. Updates the list accordingly.

 */

gboolean gdrom_list_disc_changed( cdrom_disc_t disc, const gchar *disc_name, void *user_data )

{

    gboolean list_changed = FALSE;

    int posn = 0;

    if( disc != NULL ) {

        posn = gdrom_list_find( disc_name );

        if( posn == -1 ) {

            gdrom_list_add_recent_item( disc_name );

            posn = FIRST_RECENT_INDEX;

            list_changed = TRUE;

        } else if( posn > FIRST_RECENT_INDEX ) {

            gdrom_list_move_to_front( disc_name );

            posn = FIRST_RECENT_INDEX;

            list_changed = TRUE;

        }

    }

    lxdream_set_global_config_path_value( CONFIG_GDROM, disc_name );

    lxdream_save_config();   

    CALL_HOOKS( gdrom_list_change_hook, list_changed, posn );

    return TRUE;

}

/**

 * Drives-changed callback from the host CD-Rom drivers. Probably not likely to

 * happen too often unless you're adding/removing external drives...

 */

void gdrom_list_drives_changed( GList *device_list )

{

}

/************ Public interface ***********/

void gdrom_list_init()

{

    gdrom_recent_list = lxdream_get_global_config_list_value( CONFIG_RECENT );

    register_gdrom_disc_change_hook( gdrom_list_disc_changed, NULL );

    cdrom_drive_scan();

    gdrom_device_list = cdrom_drive_get_list();

    gdrom_device_count = g_list_length(gdrom_device_list);

    gdrom_recent_count = g_list_length(gdrom_recent_list);

    // Run the hooks in case anyone registered before the list was initialized

    CALL_HOOKS( gdrom_list_change_hook, TRUE, gdrom_list_get_selection() );

}

gboolean gdrom_list_set_selection( int posn, ERROR *err )

{

    if( posn == 0 ) { // Always 'Empty'

        gdrom_unmount_disc();

        return TRUE;

    }

    if( posn <= gdrom_device_count ) {

        cdrom_drive_t device = g_list_nth_data(gdrom_device_list, posn-1);

        return gdrom_mount_image(device->name, err);

    }

    posn -= FIRST_RECENT_INDEX;

    if( posn >= 0 && posn < gdrom_recent_count ) {

        gchar *entry = g_list_nth_data(gdrom_recent_list, posn);

        return gdrom_mount_image(entry, err);

    }

    /* Should never happen */

    SET_ERROR( err, LX_ERR_BUG, "Invalid selection: This is probably a bug" );

    return FALSE;

}

gint gdrom_list_get_selection( )

{

    const char *name = gdrom_get_current_disc_name();

    if( name == NULL ) {

        return 0;

    } else {

        return gdrom_list_find(name);

    }

}

int gdrom_list_size()

{

    return gdrom_device_count + gdrom_recent_count + 2;

}

const gchar *gdrom_list_get_display_name( int posn )

{

    if( posn == 0 ) {

        return _("Empty");

    }

    if( posn <= gdrom_device_count ) {

        cdrom_drive_t device = g_list_nth_data(gdrom_device_list, posn-1);

        return device->display_name;

    }

    if( posn == gdrom_device_count + 1) {

        return "";

    }

    if( posn < 0 || posn > gdrom_list_size() ) {

        return NULL;

    }

    gchar *entry = g_list_nth_data(gdrom_recent_list, posn-FIRST_RECENT_INDEX);

    return basename(entry);

}

const gchar *gdrom_list_get_filename( int posn )

{

    if( posn == 0 ) {

        return _("Empty");

    }

    if( posn <= gdrom_device_count ) {

        cdrom_drive_t device = g_list_nth_data(gdrom_device_list, posn-1);

        return device->name;

    }

    if( posn == gdrom_device_count + 1) {

        return "";

    }

    if( posn < 0 || posn > gdrom_list_size() ) {

        return NULL;

    }

    return g_list_nth_data(gdrom_recent_list, posn-FIRST_RECENT_INDEX);

}