/*

 * @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 <glib/gprintf.h>

#include <glib/gstdio.h>

#include <math.h>

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

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

#include <gmyth/gmyth_file_transfer.h>

#include <gmyth/gmyth_livetv.h>

#include <gmyth/gmyth_uri.h>

#include <gmyth/gmyth_recorder.h>

#include <gmyth/gmyth_backendinfo.h>

#include <gmyth/gmyth_util.h>

#include <gmyth/gmyth_remote_util.h>

#include <gmyth/gmyth_tvchain.h>

#include <gmyth/gmyth_programinfo.h>

#define GST_MYTHTV_ID_NUM               1

#define MYTHTV_VERSION_DEFAULT          30

#define MYTHTV_TRANSFER_MAX_WAITS       100

/* internal GnomeVFS plug-in buffer size ( 120 Kbytes ) */

#define MYTHTV_BUFFER_SIZE                          80*1024

/* internally sized GnomeVFS plug-in buffer ( 4 Kbytes ) */

#define MYTHTV_MAX_VFS_BUFFER_SIZE                  4096

/* maximum number of bytes to be requested to the MythTV backend ( 64 Kbytes ) */

#define MYTHTV_MAX_REQUEST_SIZE                     64*1024

typedef struct {

	GMythFileTransfer *file_transfer;

	GMythLiveTV *livetv;

    GMythBackendInfo *backend_info;

    GMythURI *gmyth_uri;

    GMythRecorder *live_recorder;

    gint64 offset;

	gchar *channel_name;

	gint mythtv_version;

	gboolean configured;

} MythtvHandle;

static GnomeVFSResult do_read (GnomeVFSMethod * method,

			       GnomeVFSMethodHandle * method_handle,

			       gpointer buffer,

			       GnomeVFSFileSize num_bytes,

			       GnomeVFSFileSize * bytes_read,

			       GnomeVFSContext * context);

static GnomeVFSResult   myth_connection_start   (MythtvHandle * method_handle);

static void             myth_destroy_handle     (MythtvHandle * method_handle);

static GnomeVFSResult   myth_handle_new         (GnomeVFSURI * uri,

                                                 MythtvHandle ** method_handle);

static GnomeVFSResult   myth_get_file_info      (MythtvHandle * myth_handle,

                                                 GnomeVFSURI * uri,

                                                 GnomeVFSFileInfo * info);

static GnomeVFSResult 

myth_handle_new (GnomeVFSURI * uri,

                 MythtvHandle ** method_handle)

{   

    gchar *tmp_str1;

    gchar *tmp_str2;

    _GNOME_VFS_METHOD_PARAM_CHECK (*method_handle == NULL);

	if (gnome_vfs_uri_get_host_name (uri) == NULL) {

		return GNOME_VFS_ERROR_INVALID_HOST_NAME;

	}

    *method_handle = g_new0 (MythtvHandle, 1);

    (*method_handle)->mythtv_version = MYTHTV_VERSION_DEFAULT;

    tmp_str1 = gnome_vfs_uri_to_string (uri, GNOME_VFS_URI_HIDE_NONE);

    tmp_str2 = gnome_vfs_unescape_string (tmp_str1, "");

    (*method_handle)->backend_info = gmyth_backend_info_new_with_uri (tmp_str2);

    (*method_handle)->gmyth_uri = gmyth_uri_new_with_value (tmp_str2);

    g_free (tmp_str1);

    g_free (tmp_str2);

    return GNOME_VFS_OK;

}   

static void

myth_destroy_handle (MythtvHandle * method_handle)

{

    //TODO: abort if in tranfer state

    if (method_handle->backend_info != NULL) {

        g_object_unref (method_handle->backend_info);

        method_handle->backend_info = NULL;

    }

    if (method_handle->channel_name != NULL) {

        g_free (method_handle->channel_name);

        method_handle->channel_name = NULL;

    }

    if (method_handle->livetv != NULL) {

        g_object_unref (method_handle->livetv);

        method_handle->livetv = NULL;

    }

    if (method_handle->file_transfer != NULL) {

        g_object_unref (method_handle->file_transfer);

        method_handle->file_transfer = NULL;

    }

    if (method_handle->gmyth_uri != NULL) {

        g_object_unref (method_handle->gmyth_uri);

        method_handle->gmyth_uri = NULL;

    }

    g_free (method_handle);

}

static GnomeVFSResult

myth_get_file_info (MythtvHandle * myth_handle,

                    GnomeVFSURI * uri,

                    GnomeVFSFileInfo * info)

{

    GMythURI *gmyth_uri;

    GMythBackendInfo *backend_info;

    _GNOME_VFS_METHOD_PARAM_CHECK (info != NULL);

    if (myth_handle == NULL) {

        gchar *tmp_str1;

        gchar *tmp_str2;

        tmp_str1 = gnome_vfs_uri_to_string (uri, GNOME_VFS_URI_HIDE_NONE);

        tmp_str2 = gnome_vfs_unescape_string (tmp_str1, "");

        backend_info = gmyth_backend_info_new_with_uri (tmp_str2);

        gmyth_uri = gmyth_uri_new_with_value (tmp_str2);

        g_free (tmp_str1);

        g_free (tmp_str2);

    } else {

        backend_info = g_object_ref (myth_handle->backend_info);

        gmyth_uri = g_object_ref (myth_handle->gmyth_uri);

    }

    info->valid_fields = 0;

	info->valid_fields = GNOME_VFS_FILE_INFO_FIELDS_TYPE | 

        GNOME_VFS_FILE_INFO_FIELDS_MIME_TYPE | 

        GNOME_VFS_FILE_INFO_FIELDS_PERMISSIONS;

	info->type = GNOME_VFS_FILE_TYPE_REGULAR;

	/* fixme: get from file extension? */

	info->mime_type = g_strdup ("video/x-nuv");

	info->permissions = GNOME_VFS_PERM_USER_READ | 

        GNOME_VFS_PERM_OTHER_READ | 

        GNOME_VFS_PERM_GROUP_READ;

	info->name = g_strdup (gmyth_uri_get_path (gmyth_uri));

    /* file size for remote files */

    if (gmyth_uri_is_livetv (gmyth_uri) == FALSE) {

        GMythFileTransfer *file_transfer = gmyth_file_transfer_new (backend_info);

        /* Verifies if the file exists */

        if (!gmyth_util_file_exists (backend_info, 

                    gmyth_uri_get_path (gmyth_uri))) {

            g_object_unref (backend_info);

            g_debug ("NOT FOUND %s/%d", __FUNCTION__, __LINE__);

            return GNOME_VFS_ERROR_NOT_FOUND;

		}

		info->size = gmyth_file_transfer_get_filesize (file_transfer);

        info->valid_fields |= GNOME_VFS_FILE_INFO_FIELDS_SIZE;

		g_object_unref (file_transfer);

	}

    g_object_unref (backend_info);

    g_object_unref (gmyth_uri);

    return GNOME_VFS_OK;

}

static GnomeVFSResult

myth_connection_start (MythtvHandle * method_handle)

{

    GnomeVFSResult result = GNOME_VFS_OK;

    _GNOME_VFS_METHOD_PARAM_CHECK (method_handle != NULL);

    _GNOME_VFS_METHOD_PARAM_CHECK (method_handle->backend_info != NULL);

	/* Connect to the backend */

	if (gmyth_uri_is_livetv (method_handle->gmyth_uri) == TRUE) {

		method_handle->livetv = gmyth_livetv_new (method_handle->backend_info);

		method_handle->channel_name = gmyth_uri_get_channel_name (method_handle->gmyth_uri);

		g_debug ("[%s] Channel name = %s\n", __FUNCTION__, 

                method_handle->channel_name);

		if (method_handle->channel_name != NULL) {

		    if (gmyth_livetv_channel_name_setup (method_handle->livetv, 

                    method_handle->channel_name) == FALSE) {

                result = GNOME_VFS_ERROR_INVALID_URI;

    			goto error;

			}

		} else if (gmyth_livetv_setup (method_handle->livetv) == FALSE) {

                result = GNOME_VFS_ERROR_INVALID_URI;

                goto error;

		}

    	method_handle->file_transfer = 

            gmyth_livetv_create_file_transfer (method_handle->livetv);

        if (method_handle->file_transfer == NULL) {

            result = GNOME_VFS_ERROR_INVALID_URI;

    		g_debug ("MythTV FileTransfer is NULL!\n");

            goto error;

        }

	    if (!gmyth_file_transfer_open (method_handle->file_transfer,

                                        method_handle->livetv->uri != NULL ? 

                                        gmyth_uri_get_path (method_handle->livetv->uri) :

                                        method_handle->livetv->proginfo->pathname->str)) {

            g_debug ("Couldn't open MythTV FileTransfer is NULL!\n");

            result = GNOME_VFS_ERROR_NOT_OPEN;

            goto error;

        }

    }

    else {

        method_handle->file_transfer = 

            gmyth_file_transfer_new (method_handle->backend_info);

		/* Verifies if the file exists */

		if (!gmyth_util_file_exists (method_handle->backend_info, 

                    gmyth_uri_get_path (method_handle->gmyth_uri))) {

            g_debug ("NOT FOUND %s/%d", __FUNCTION__, __LINE__);

		    result = GNOME_VFS_ERROR_NOT_FOUND;

            goto error;

		}

		/* sets the Playback monitor connection */

		result = gmyth_file_transfer_open (method_handle->file_transfer,

                  					    gmyth_uri_get_path (method_handle->gmyth_uri));

	} /* if - LiveTV or not? */

	method_handle->configured = TRUE;    

    if (method_handle->file_transfer == NULL) {

        result = GNOME_VFS_ERROR_NOT_OPEN;

        goto error;

    }

	g_return_val_if_fail (method_handle->file_transfer != NULL, 

            GNOME_VFS_ERROR_NOT_OPEN);

error:

    return result; 

}

static GnomeVFSResult

do_open (GnomeVFSMethod * method,

	 GnomeVFSMethodHandle ** method_handle,

	 GnomeVFSURI * uri,

	 GnomeVFSOpenMode mode, GnomeVFSContext * context)

{

	MythtvHandle *myth_handle = NULL;

    GnomeVFSResult result = GNOME_VFS_OK;

	_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_INVALID_OPEN_MODE;

	}

    result = myth_handle_new (uri, &myth_handle);

    if (result != GNOME_VFS_OK) 

        return result;

    result = myth_connection_start (myth_handle);

    if (result != GNOME_VFS_OK) {

        myth_destroy_handle (myth_handle);

        myth_handle = NULL;

        return result;

    }

    *method_handle = (GnomeVFSMethodHandle *) myth_handle;

    return result;

}

static GnomeVFSResult

do_create (GnomeVFSMethod	 *method,

	   GnomeVFSMethodHandle **method_handle,

	   GnomeVFSURI 		 *uri,

	   GnomeVFSOpenMode 	  mode,

	   gboolean 		  exclusive,

	   guint 		  perm,

	   GnomeVFSContext 	 *context)

{

    return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSResult

do_close (GnomeVFSMethod * method,

        GnomeVFSMethodHandle * method_handle, 

        GnomeVFSContext * context)

{

	MythtvHandle *myth_handle = (MythtvHandle *) method_handle;

    myth_destroy_handle (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)

{

    GnomeVFSResult result;

    MythtvHandle *myth_handle;

    gint64 total_read = 0;

    GByteArray *myth_buffer = g_byte_array_new ();

    _GNOME_VFS_METHOD_PARAM_CHECK (method_handle != NULL);

    myth_handle = (MythtvHandle *) method_handle;

    result = GNOME_VFS_OK;

    total_read = gmyth_file_transfer_read (myth_handle->file_transfer,

                              		   myth_buffer,

                         		   num_bytes, gmyth_uri_is_livetv (myth_handle->gmyth_uri));

    if (total_read == -1) {

        result = GNOME_VFS_ERROR_IO;

        total_read = 0;

    }

    if (total_read < num_bytes) {

        result = GNOME_VFS_ERROR_EOF;

    }

    if (total_read > 0) {

	g_memmove (buffer, myth_buffer->data, total_read);

        g_byte_array_free (myth_buffer, TRUE);

        myth_handle->offset += total_read;

    } 

    *bytes_read = (GnomeVFSFileSize) total_read;

	return result;

}

static GnomeVFSResult

do_write (GnomeVFSMethod 	*method,

	  GnomeVFSMethodHandle  *method_handle,

	  gconstpointer 	 buffer,

	  GnomeVFSFileSize 	 num_bytes,

	  GnomeVFSFileSize 	*bytes_written,

	  GnomeVFSContext 	*context)

{

    return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSResult

do_seek (GnomeVFSMethod	      *method,

	 GnomeVFSMethodHandle *method_handle,

	 GnomeVFSSeekPosition  whence,

	 GnomeVFSFileOffset    offset,

	 GnomeVFSContext      *context)

{

	MythtvHandle *myth_handle;

    guint64 whence_p = 0;

    gint64 new_offset =0;

     _GNOME_VFS_METHOD_PARAM_CHECK (method_handle != NULL);

     myth_handle = (MythtvHandle *) method_handle;    

    g_debug ("seek offset%"G_GINT64_FORMAT" whence %d", offset, whence);

    if (gmyth_uri_is_livetv (myth_handle->gmyth_uri))

        return GNOME_VFS_ERROR_NOT_SUPPORTED;

    switch (whence)

    {

        case GNOME_VFS_SEEK_START:

            whence_p = 0;

            break;

        case GNOME_VFS_SEEK_CURRENT:

            whence_p = myth_handle->offset;

            break;

        case GNOME_VFS_SEEK_END:

            return GNOME_VFS_ERROR_NOT_SUPPORTED;

    }

    new_offset = gmyth_file_transfer_seek (myth_handle->file_transfer, offset, whence_p);

    if (new_offset != 0) {

        myth_handle->offset = new_offset;

        return GNOME_VFS_OK;

    }

    return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSResult

do_tell (GnomeVFSMethod       *method,

	 GnomeVFSMethodHandle *method_handle,

	 GnomeVFSFileSize   *offset_return)

{

	MythtvHandle *myth_handle = NULL;

     _GNOME_VFS_METHOD_PARAM_CHECK (method_handle != NULL);

    myth_handle = (MythtvHandle *) method_handle;

    *offset_return = myth_handle->offset;

    return GNOME_VFS_OK;

}

static GnomeVFSResult

do_truncate_handle (GnomeVFSMethod *method,

		    GnomeVFSMethodHandle *method_handle,

		    GnomeVFSFileSize where,

		    GnomeVFSContext *context)

{

    return GNOME_VFS_ERROR_READ_ONLY;

}

static GnomeVFSResult

do_open_directory (GnomeVFSMethod 	    *method,

		   GnomeVFSMethodHandle    **method_handle,

		   GnomeVFSURI 		    *uri,

		   GnomeVFSFileInfoOptions   options,

		   GnomeVFSContext 	    *context) 

{

    return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSResult

do_close_directory (GnomeVFSMethod 	 *method,

		    GnomeVFSMethodHandle *method_handle,

		    GnomeVFSContext 	 *context) 

{

    return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSResult

do_read_directory (GnomeVFSMethod 	*method,

       		   GnomeVFSMethodHandle *method_handle,

       		   GnomeVFSFileInfo 	*file_info,

		   GnomeVFSContext 	*context)

{

    return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSResult

do_get_file_info (GnomeVFSMethod * method,

		  GnomeVFSURI * uri,

		  GnomeVFSFileInfo * file_info,

		  GnomeVFSFileInfoOptions options,

		  GnomeVFSContext * context)

{

    return myth_get_file_info (NULL, uri, file_info);

}

static GnomeVFSResult

do_get_file_info_from_handle (GnomeVFSMethod 		*method,

            			      GnomeVFSMethodHandle 	*method_handle,

			                  GnomeVFSFileInfo 		*file_info,

            			      GnomeVFSFileInfoOptions    options,

			                  GnomeVFSContext 		*context)

{

	MythtvHandle *myth_handle = (MythtvHandle *) method_handle;

    return myth_get_file_info (myth_handle, NULL, file_info);

}

static gboolean

do_is_local (GnomeVFSMethod * method, const GnomeVFSURI * uri)

{

	return FALSE;

}

static GnomeVFSResult

do_make_directory (GnomeVFSMethod  *method, 

		            GnomeVFSURI     *uri,

                    guint 	    perm, 

		            GnomeVFSContext *context) 

{

    return GNOME_VFS_ERROR_READ_ONLY;

}

static GnomeVFSResult 

do_remove_directory (GnomeVFSMethod  *method, 

		             GnomeVFSURI     *uri, 

		             GnomeVFSContext *context) 

{

    return GNOME_VFS_ERROR_READ_ONLY;

}

static GnomeVFSResult

do_move (GnomeVFSMethod  *method,

	 GnomeVFSURI 	 *old_uri,

	 GnomeVFSURI 	 *new_uri,

	 gboolean         force_replace,

	 GnomeVFSContext *context)

{

    return GNOME_VFS_ERROR_READ_ONLY;

}

static GnomeVFSResult 

do_unlink (GnomeVFSMethod  *method,

	   GnomeVFSURI 	   *uri,

	   GnomeVFSContext *context)

{

    return GNOME_VFS_ERROR_READ_ONLY;

}

static GnomeVFSResult 

do_check_same_fs (GnomeVFSMethod  *method,

		  GnomeVFSURI 	  *a,

		  GnomeVFSURI 	  *b,

		  gboolean 	  *same_fs_return,

		  GnomeVFSContext *context)

{

    return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSResult

do_set_file_info (GnomeVFSMethod 		*method,

		  GnomeVFSURI 			*uri,

		  const GnomeVFSFileInfo 	*info,

		  GnomeVFSSetFileInfoMask 	 mask,

		  GnomeVFSContext 		*context)

{

    return GNOME_VFS_ERROR_READ_ONLY;

}

static GnomeVFSResult

do_truncate (GnomeVFSMethod *method,

	     GnomeVFSURI *uri,

	     GnomeVFSFileSize where,

	     GnomeVFSContext *context)

{

    return GNOME_VFS_ERROR_READ_ONLY;

}

static GnomeVFSResult

do_find_directory (GnomeVFSMethod *method,

		   GnomeVFSURI *near_uri,

		   GnomeVFSFindDirectoryKind kind,

		   GnomeVFSURI **result_uri,

		   gboolean create_if_needed,

		   gboolean find_if_needed,

		   guint permissions,

		   GnomeVFSContext *context)

{

	return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSResult

do_create_symbolic_link (GnomeVFSMethod *method,

			 GnomeVFSURI *uri,

			 const char *target_reference,

			 GnomeVFSContext *context)

{

    return GNOME_VFS_ERROR_READ_ONLY;

}

static GnomeVFSResult

do_monitor_add (GnomeVFSMethod *method,

		GnomeVFSMethodHandle **method_handle_return,

		GnomeVFSURI *uri,

		GnomeVFSMonitorType monitor_type)

{

	return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSResult

do_monitor_cancel (GnomeVFSMethod *method,

		   GnomeVFSMethodHandle *method_handle)

{

	return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSResult

do_file_control (GnomeVFSMethod *method,

		 GnomeVFSMethodHandle *method_handle,

		 const char *operation,

		 gpointer operation_data,

		 GnomeVFSContext *context)

{

	return GNOME_VFS_ERROR_NOT_SUPPORTED;

}

static GnomeVFSMethod method = {

	sizeof (GnomeVFSMethod),

	do_open, 

	do_create,

	do_close,

	do_read, 

	do_write,

	do_seek,

	do_tell,

	do_truncate_handle, 

	do_open_directory,

	do_close_directory,

	do_read_directory,

	do_get_file_info,

	do_get_file_info_from_handle,

	do_is_local, 

	do_make_directory, 

	do_remove_directory,

	do_move,

	do_unlink,

	do_check_same_fs,

	do_set_file_info,

	do_truncate, 

	do_find_directory, 

	do_create_symbolic_link,  

	do_monitor_add,  

	do_monitor_cancel,  

	do_file_control 	

};

GnomeVFSMethod *

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

{

	return &method;

}

void

vfs_module_shutdown (GnomeVFSMethod * method)

{

}