/*
 * @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 <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							1024*80
/* 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					1024*64

static GnomeVFSResult do_read (GnomeVFSMethod * method,
			       GnomeVFSMethodHandle * method_handle,
			       gpointer buffer,
			       GnomeVFSFileSize num_bytes,
			       GnomeVFSFileSize * bytes_read,
			       GnomeVFSContext * context);

typedef struct {
	GMythFileTransfer *file_transfer;
	GMythLiveTV *livetv;
	gchar *channel_name;

	gint mythtv_version;
	gint64 content_size;
	guint64 bytes_read;

	GByteArray *buffer;
	gsize buffer_remain;
	gboolean is_livetv;

	gboolean configured;

} MythtvHandle;

//static MythtvHandle *myth_handle = NULL;

static GnomeVFSResult
do_open (GnomeVFSMethod * method,
	 GnomeVFSMethodHandle ** method_handle,
	 GnomeVFSURI * uri,
	 GnomeVFSOpenMode mode, GnomeVFSContext * context)
{
	MythtvHandle *myth_handle = NULL;
	GMythBackendInfo *backend_info = NULL;
	GMythURI *gmyth_uri = NULL;
	gboolean ret = TRUE;

	_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 (gnome_vfs_uri_get_host_name (uri) == NULL) {
		return GNOME_VFS_ERROR_INVALID_HOST_NAME;
	}

	if ((NULL == myth_handle) || !myth_handle->configured) {
		myth_handle = g_new0 (MythtvHandle, 1);

		myth_handle->configured = FALSE;

		myth_handle->is_livetv = FALSE;

		/* Initialize mythtv handler */
		myth_handle->file_transfer = NULL;
		myth_handle->livetv = NULL;
		myth_handle->mythtv_version = MYTHTV_VERSION_DEFAULT;
		myth_handle->bytes_read = 0;
		myth_handle->content_size = (GnomeVFSFileSize) - 1;

		/* Creates and fills out the backend info structure */
		backend_info =
		    gmyth_backend_info_new_with_uri
		    (gnome_vfs_unescape_string
		     (gnome_vfs_uri_to_string
		      (uri, GNOME_VFS_URI_HIDE_NONE), ""));

		/* creates an instance of  */
		gmyth_uri =
		    gmyth_uri_new_with_value (gnome_vfs_unescape_string
					      (gnome_vfs_uri_to_string
					       (uri,
						GNOME_VFS_URI_HIDE_NONE),
					       ""));

		myth_handle->is_livetv = gmyth_uri_is_livetv (gmyth_uri);

		/* Connect to the backend */
		if (gmyth_uri != NULL && myth_handle->is_livetv == TRUE) {

			if (NULL == myth_handle->livetv) {
				myth_handle->livetv = gmyth_livetv_new ();

				myth_handle->channel_name =
				    gmyth_uri_get_channel_name (gmyth_uri);

				g_debug ("[%s] Channel name = %s\n",
					 __FUNCTION__,
					 myth_handle->channel_name);

				if (myth_handle->channel_name != NULL) {
					if (gmyth_livetv_channel_name_setup
					    (myth_handle->livetv,
					     myth_handle->channel_name,
					     backend_info) == FALSE) {
						g_object_unref (gmyth_uri);
						ret = FALSE;
					}
				} else {
					if (gmyth_livetv_setup
					    (myth_handle->livetv,
					     backend_info) == FALSE) {
						g_object_unref (gmyth_uri);
						ret = FALSE;
					}
				}
			}

			if (NULL == myth_handle->file_transfer) {
				myth_handle->file_transfer =
				    gmyth_livetv_create_file_transfer
				    (myth_handle->livetv);

				if (NULL == myth_handle->file_transfer) {
					ret = FALSE;
					g_debug
					    ("MythTV FileTransfer is NULL!\n");
					return GNOME_VFS_ERROR_NOT_OPEN;
				}

				if (!gmyth_file_transfer_open
				    (myth_handle->file_transfer,
				     myth_handle->livetv->uri !=
				     NULL ?
				     gmyth_uri_get_path (myth_handle->
							 livetv->
							 uri) :
				     myth_handle->livetv->proginfo->
				     pathname->str)) {
					g_debug
					    ("Couldn't open MythTV FileTransfer is NULL!\n");
					g_object_unref (myth_handle->
							file_transfer);
					myth_handle->file_transfer = NULL;
					ret = FALSE;
				}
			}
			/* if - FileTransfer is NULL, or not */
		} else {

			if (NULL == myth_handle->file_transfer) {

				myth_handle->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);
					ret = FALSE;
				}

				/* sets the Playback monitor connection */
				ret =
				    gmyth_file_transfer_open (myth_handle->
							      file_transfer,
							      gmyth_uri_get_path
							      (gmyth_uri));

			}

		}		/* if - LiveTV or not? */

		if (ret == FALSE) {
			g_debug ("MythTV FileTransfer open error.\n");
			return GNOME_VFS_ERROR_NOT_OPEN;
		}

		myth_handle->configured = TRUE;

		g_object_unref (backend_info);

		if (gmyth_uri != NULL)
			g_object_unref (gmyth_uri);

		myth_handle->buffer =
		    g_byte_array_sized_new (MYTHTV_BUFFER_SIZE);
		myth_handle->buffer_remain = 0;

		g_return_val_if_fail (myth_handle->file_transfer != NULL,
				      GNOME_VFS_ERROR_NOT_OPEN);

		if ( /*myth_handle->file_transfer->filesize <= 0 && */
		    myth_handle->is_livetv) {
			myth_handle->content_size =
			    gmyth_recorder_get_file_position (myth_handle->
							      livetv->
							      recorder);
		} else {
			myth_handle->content_size =
			    myth_handle->file_transfer->filesize;
		}

	}
	/* if - configured or not? */
	*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;
	GnomeVFSFileSize bytes_to_read = num_bytes;

	if (!myth_handle->is_livetv
	    && (myth_handle->bytes_read >= myth_handle->content_size))
		return GNOME_VFS_ERROR_EOF;

	/* fixme: change this to min math function */
	if ((myth_handle->content_size > 0)) {
		if (!myth_handle->is_livetv &&
		    (num_bytes >
		     (myth_handle->content_size -
		      myth_handle->bytes_read))) {
			bytes_to_read =
			    myth_handle->content_size -
			    myth_handle->bytes_read;
		}
	}

	/* Loop sending the Myth File Transfer request:
	 * Retry whilst authentication fails and we supply it. */
	if ((myth_handle->buffer_remain =
	     myth_handle->buffer->len) < bytes_to_read) {
		gint buffer_size;

		while (MYTHTV_BUFFER_SIZE != myth_handle->buffer_remain) {

			/* resize buffer length request to no more than MYTHTV_MAX_REQUEST_SIZE */
			if ((MYTHTV_BUFFER_SIZE -
			     myth_handle->buffer_remain) <=
			    MYTHTV_MAX_REQUEST_SIZE)
				buffer_size =
				    MYTHTV_BUFFER_SIZE -
				    myth_handle->buffer_remain;
			else
				buffer_size = MYTHTV_MAX_REQUEST_SIZE;

			GByteArray *tmp_buffer = g_byte_array_new ();

			g_debug
			    ("Asking %d bytes (there is %d bytes in the buffer)\n",
			     buffer_size, myth_handle->buffer_remain);

			gint len =
			    gmyth_file_transfer_read (myth_handle->
						      file_transfer,
						      tmp_buffer,
						      buffer_size, TRUE);

			if ( !myth_handle->is_livetv ) {
				if ( len < 0 ) {
					g_byte_array_free (tmp_buffer, TRUE);
					g_debug ("Fail to read bytes");
					return GNOME_VFS_ERROR_IO;
				} else if ( len == 0 ) {
				   g_byte_array_free (tmp_buffer, TRUE);
				   g_warning ("End of file probably achieved");
				   return GNOME_VFS_ERROR_EOF;
			   }
			} /* if */
			
			myth_handle->buffer =
			    g_byte_array_append (myth_handle->buffer,
						 tmp_buffer->data, len);

			myth_handle->buffer_remain += len;

			if (tmp_buffer != NULL) {
				g_byte_array_free (tmp_buffer, TRUE);
				tmp_buffer = NULL;
			}
		}		/* while - iterates until fills the internal buffer */

	}
	/* if - got from the network, or not */
	bytes_to_read =
	    (bytes_to_read >
	     myth_handle->buffer_remain) ? myth_handle->
	    buffer_remain : bytes_to_read;
	/* gets the first buffer_size bytes from the byte array buffer variable */

	g_memmove (buffer, myth_handle->buffer->data, bytes_to_read);

	myth_handle->bytes_read += bytes_to_read;
	myth_handle->buffer_remain -= bytes_to_read;

	/* flushs the newly buffer got from byte array */
	myth_handle->buffer =
	    g_byte_array_remove_range (myth_handle->buffer, 0,
				       bytes_to_read);
	g_debug
	    ("Got from %llu bytes from internal buffer. (there are %d bytes in the buffer, from a total of %llu dispatched.)\n",
	     bytes_to_read, myth_handle->buffer_remain,
	     myth_handle->bytes_read);

	*bytes_read = bytes_to_read;

	return GNOME_VFS_OK;
}

static GnomeVFSResult
do_close (GnomeVFSMethod * method,
	  GnomeVFSMethodHandle * method_handle, GnomeVFSContext * context)
{

	MythtvHandle *myth_handle = (MythtvHandle *) method_handle;

	//if ( NULL == myth_handle || myth_handle->configured ) {

	if (myth_handle->file_transfer != NULL) {
		g_object_unref (myth_handle->file_transfer);
		myth_handle->file_transfer = NULL;
	}

	if (myth_handle->is_livetv && myth_handle->livetv != NULL) {
		g_object_unref (myth_handle->livetv);
		myth_handle->livetv = NULL;
	}

	if (myth_handle->buffer) {
		g_byte_array_free (myth_handle->buffer, TRUE);
		myth_handle->buffer = NULL;
	}

	myth_handle->configured = FALSE;

	g_free (myth_handle);

	myth_handle = NULL;

	// }

	return GNOME_VFS_OK;
}

static GnomeVFSResult
do_get_file_info (GnomeVFSMethod * method,
		  GnomeVFSURI * uri,
		  GnomeVFSFileInfo * file_info,
		  GnomeVFSFileInfoOptions options,
		  GnomeVFSContext * context)
{
	GMythFileTransfer *file_transfer = NULL;
	GMythRecorder *recorder = NULL;
	GMythTVChain *tvchain = NULL;
	GMythBackendInfo *backend_info = NULL;
	GMythURI *gmyth_uri = NULL;
	GMythSocket *socket = NULL;
	gboolean is_livetv = FALSE;
	gboolean ret = TRUE;
	gboolean res = TRUE;

	/* Creates and fills out the backend info structure */
	backend_info =
	    gmyth_backend_info_new_with_uri (gnome_vfs_unescape_string
					     (gnome_vfs_uri_to_string
					      (uri,
					       GNOME_VFS_URI_HIDE_NONE),
					      ""));

	/* creates an instance of */
	gmyth_uri =
	    gmyth_uri_new_with_value (gnome_vfs_unescape_string
				      (gnome_vfs_uri_to_string
				       (uri, GNOME_VFS_URI_HIDE_NONE),
				       ""));

	is_livetv = gmyth_uri_is_livetv (gmyth_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;
	/* fixme: get from file extension? */
	file_info->mime_type = g_strdup ("video/x-nuv");
	file_info->permissions =
	    GNOME_VFS_PERM_USER_READ |
	    GNOME_VFS_PERM_OTHER_READ | GNOME_VFS_PERM_GROUP_READ;

	g_debug ("gnome_vfs_uri == %s | gmyth_uri == %s.\n",
		 gnome_vfs_uri_get_path (uri),
		 gmyth_uri_get_path (gmyth_uri));

	/* Connect to the backend */
	if (gmyth_uri != NULL && is_livetv == TRUE) {

		/* start to get file info from LiveTV remote encoder */
		socket = gmyth_socket_new ();

		/* FIME: Implement this at gmyth_socket */
		res =
		    gmyth_socket_connect_to_backend (socket,
						     backend_info->
						     hostname,
						     backend_info->port,
						     TRUE);
		if (!res) {
			g_debug ("[%s] LiveTV can not connect to backend",
				 __FUNCTION__);
			res = FALSE;
			goto error;
		}

		if (gmyth_remote_util_get_free_recorder_count (socket) <=
		    0) {
			g_debug ("No free remote encoder available.");
			res = FALSE;
			goto error;
		}

		/* Gets the recorder num */
		recorder = remote_request_next_free_recorder (socket, -1);

		if ( socket != NULL )
			g_object_unref (socket);

		if (recorder == NULL) {
			g_debug ("[%s] None remote encoder available",
				 __FUNCTION__);
			res = FALSE;
			goto error;
		}

		/* Init remote encoder. Opens its control socket. */
		res = gmyth_recorder_setup (recorder);
		if (!res) {
			g_debug
			    ("[%s] Fail while setting remote encoder\n",
			     __FUNCTION__);
			res = FALSE;
			goto error;
		}

		/* Creates livetv chain handler */
		tvchain = gmyth_tvchain_new ();
		gmyth_tvchain_initialize (tvchain, backend_info);

		if (tvchain == NULL || tvchain->tvchain_id == NULL) {
			res = FALSE;
			goto error;
		}
		/* Spawn live tv. Uses the socket to send mythprotocol data to start livetv in the backend (remotelly) */
		res = gmyth_recorder_spawntv (recorder,
					      gmyth_tvchain_get_id
					      (tvchain));
		if (!res) {
			g_warning ("[%s] Fail while spawn tv\n",
				   __FUNCTION__);
			res = FALSE;
			goto error;
		}
		
		sleep(1);

		/* DEBUG message */
		GMythProgramInfo *prog_info =
		    gmyth_recorder_get_current_program_info (recorder);

		if (prog_info != NULL) {

			g_debug ("path = %s", prog_info->pathname->str);

			file_info->name =
			    g_strdup (g_strrstr
				      (prog_info->pathname->str, "/"));

		} else {
			file_info->name = g_strdup ("LiveTV.nuv");
			file_info->size =
			    gmyth_recorder_get_file_position (recorder);
		}

		if (recorder != NULL)
			g_object_unref (recorder);

		if (prog_info != NULL)
			g_object_unref (prog_info);

		if (tvchain != NULL)
			g_object_unref (tvchain);

		file_info->size = (GnomeVFSFileSize) - 1;

	} else {

		/* start to get file info from remote file encoder */
		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);
			return GNOME_VFS_ERROR_NOT_FOUND;
		}

		/* sets the Playback monitor connection */
		ret =
		    gmyth_file_transfer_open (file_transfer,
					      gmyth_uri_get_path
					      (gmyth_uri));

		file_info->name = g_strdup (gnome_vfs_uri_get_path (uri));

	}			/* if - LiveTV or not? */

	if (ret == FALSE) {
		g_debug ("MythTV FileTransfer open error\n");
		return GNOME_VFS_ERROR_NOT_OPEN;
	}

	if (ret == TRUE && file_transfer != NULL) {
		file_info->size =
		    gmyth_file_transfer_get_filesize (file_transfer);
		if (file_transfer)
			g_object_unref (file_transfer);
	}

	file_info->block_count = GNOME_VFS_FILE_INFO_FIELDS_BLOCK_COUNT;
	file_info->io_block_size =
	    GNOME_VFS_FILE_INFO_FIELDS_IO_BLOCK_SIZE;

      error:
	if (backend_info)
		g_object_unref (backend_info);

	if (!res)
		return GNOME_VFS_ERROR_IO;

	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)
{
}