/*

 * @author Hallyson 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

#include <string.h>

#include <glib.h>

#include <math.h>

#include <libgnomevfs/gnome-vfs-module.h>

#include <libgnomevfs/gnome-vfs-utils.h>

#include "myth_file_transfer.h"

#define GST_MYTHTV_ID_NUM               1

#define MYTHTV_VERSION_DEFAULT          30

static GnomeVFSResult do_read (GnomeVFSMethod *method,

                               GnomeVFSMethodHandle *method_handle,

                               gpointer buffer,

                               GnomeVFSFileSize num_bytes,

                               GnomeVFSFileSize *bytes_read,

                               GnomeVFSContext *context);

typedef struct {

    MythFileTransfer *file_transfer;

    gint mythtv_version;

    guint64 content_size;

    guint64 bytes_read;

    guint64 read_offset;

    gboolean live_tv;

} MythtvHandle;

static GnomeVFSResult

do_open (GnomeVFSMethod *method,

         GnomeVFSMethodHandle **method_handle,

         GnomeVFSURI *uri,

         GnomeVFSOpenMode mode,

         GnomeVFSContext *context)

{

    MythtvHandle *myth_handle = g_new0 (MythtvHandle, 1);

    const gchar *user, *password, *host, *transfer_uri;

    guint port;

    gchar *path;

    gboolean ret;

    _GNOME_VFS_METHOD_PARAM_CHECK (method_handle != NULL);

    _GNOME_VFS_METHOD_PARAM_CHECK (uri != NULL);

    if (mode & GNOME_VFS_OPEN_WRITE) {

        return GNOME_VFS_ERROR_NOT_PERMITTED;

    }

    if ((host = gnome_vfs_uri_get_host_name (uri)) == NULL) {

	return GNOME_VFS_ERROR_INVALID_HOST_NAME;

    }

    /* Parse URI */

    path = gnome_vfs_unescape_string (uri->text, NULL);

    port = gnome_vfs_uri_get_host_port (uri);

    user = gnome_vfs_uri_get_user_name (uri);

    password = gnome_vfs_uri_get_password (uri);

    transfer_uri = gnome_vfs_uri_to_string (uri, 

		    GNOME_VFS_URI_HIDE_USER_NAME | GNOME_VFS_URI_HIDE_PASSWORD);

    /* Initialize mythtv handler*/

    myth_handle->file_transfer = NULL;

    myth_handle->mythtv_version = MYTHTV_VERSION_DEFAULT;

    myth_handle->bytes_read = 0;

    myth_handle->content_size = -1;

    myth_handle->read_offset = 0;

    myth_handle->live_tv = FALSE;

    /* Connect to the backend */

    myth_handle->file_transfer = myth_file_transfer_new ( GST_MYTHTV_ID_NUM /*mythtv->live_tv_id*/,

        g_string_new( transfer_uri ), -1, myth_handle->mythtv_version );

    if ( myth_handle->file_transfer == NULL ) {

	return GNOME_VFS_ERROR_NOT_OPEN;

    }

    /* sets the Playback monitor connection */

    ret = myth_file_transfer_playback_setup( &(myth_handle->file_transfer), myth_handle->live_tv );

    if (ret == FALSE) {

        g_printerr ("Mythtv FileTransfer playback setup error\n");

	return GNOME_VFS_ERROR_NOT_OPEN;

    }

    /* sets the FileTransfer instance connection (video/audio download) */

    ret = myth_file_transfer_setup( &(myth_handle->file_transfer), myth_handle->live_tv );

    if ( ret == FALSE ) {

      g_printerr ("MythTV FileTransfer request failed when setting up socket connection!\n" );

      return GNOME_VFS_ERROR_NOT_OPEN;

    }

    // TODO: Verify if file exists in the backend

    myth_handle->content_size = myth_handle->file_transfer->filesize;

    *method_handle = (GnomeVFSMethodHandle *) myth_handle;

    return GNOME_VFS_OK;

}

static GnomeVFSResult

do_read (GnomeVFSMethod *method,

         GnomeVFSMethodHandle *method_handle,

         gpointer buffer,

         GnomeVFSFileSize num_bytes,

         GnomeVFSFileSize *bytes_read,

         GnomeVFSContext *context)

{

    MythtvHandle *myth_handle = (MythtvHandle *) method_handle;

    guint len = 0, offset = 0;

    GnomeVFSFileSize bytes_to_read;

    g_debug ("do_read(): file size: %llu, already read: %llu, requested: %llu", myth_handle->content_size,

		    myth_handle->bytes_read, num_bytes);

    *bytes_read = 0;

    if (myth_handle->bytes_read >= myth_handle->content_size)

        return GNOME_VFS_ERROR_EOF;

    // fixme: change this to min math function

    if (num_bytes > myth_handle->content_size - myth_handle->bytes_read)

	    bytes_to_read = myth_handle->content_size - myth_handle->bytes_read;

    else

	    bytes_to_read = num_bytes;

    /* Loop sending the Myth File Transfer request:

    * Retry whilst authentication fails and we supply it. */

    // lock here ???

    while ( bytes_to_read > 0 ) {

  	len = myth_file_transfer_read( myth_handle->file_transfer,

			buffer + offset, bytes_to_read, TRUE );

        if ( len > 0 ) {

            offset += len;      

            bytes_to_read -= len;

        } else {

	    break;

        }

        if ( offset == num_bytes )

          break;

    }

    if (( offset <= 0 ) && !myth_handle->live_tv )

        return GNOME_VFS_ERROR_EOF;

    myth_handle->read_offset += offset;

    myth_handle->bytes_read += offset;

    *bytes_read = offset;

    return GNOME_VFS_OK;

}

static GnomeVFSResult

do_close (GnomeVFSMethod *method,

          GnomeVFSMethodHandle *method_handle,

          GnomeVFSContext *context)

{

    MythtvHandle *myth_handle = (MythtvHandle *) method_handle;

    if (myth_handle->file_transfer)

        g_object_unref (myth_handle->file_transfer);

    g_free (myth_handle);

    return GNOME_VFS_OK;

}

static GnomeVFSResult

do_get_file_info (GnomeVFSMethod *method,

                  GnomeVFSURI *uri,

                  GnomeVFSFileInfo *file_info,

                  GnomeVFSFileInfoOptions options,

                  GnomeVFSContext *context)

{

    GString *name = g_string_new ("hallyson");	

    file_info->name = g_string_free (name, FALSE);//"hallyson.txt";//get_base_from_uri (uri);

    file_info->valid_fields = file_info->valid_fields

        | GNOME_VFS_FILE_INFO_FIELDS_TYPE

        | GNOME_VFS_FILE_INFO_FIELDS_MIME_TYPE

        | GNOME_VFS_FILE_INFO_FIELDS_PERMISSIONS;

    file_info->type = GNOME_VFS_FILE_TYPE_REGULAR;

    file_info->mime_type = "video/x-nuv"; //g_strdup (gnome_vfs_mime_type_from_name (file_info->name));

    file_info->permissions =

        GNOME_VFS_PERM_USER_READ |

        GNOME_VFS_PERM_OTHER_READ |

        GNOME_VFS_PERM_GROUP_READ;

    return GNOME_VFS_OK;

}

static gboolean

do_is_local (GnomeVFSMethod *method,

             const GnomeVFSURI *uri)

{

	return FALSE;

}

static GnomeVFSMethod method = {

	sizeof (GnomeVFSMethod),

	do_open,

	NULL,

	do_close,

	do_read,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

	do_get_file_info,

	NULL,

	do_is_local,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

	NULL,

};

GnomeVFSMethod *

vfs_module_init (const char *method_name, const char *args)

{

	return &method;

}

void

vfs_module_shutdown (GnomeVFSMethod *method)

{

}