/*

 * @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

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;

#ifdef DEBUG

static FILE *fpout = NULL;

static gboolean first = TRUE;

#endif

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;

	}

    // FIXME: myth_handle is always NULL here

	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 (backend_info);

				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) == FALSE) {

						g_object_unref (gmyth_uri);

						ret = FALSE;

					}

				} else {

					if (gmyth_livetv_setup (myth_handle->livetv) == 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->is_livetv && myth_handle->livetv != NULL) {

		g_object_unref (myth_handle->livetv);

		myth_handle->livetv = NULL;

	}

	if (myth_handle->file_transfer != NULL) {

		g_object_unref (myth_handle->file_transfer);

		myth_handle->file_transfer = 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->channel_name);

	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 = 0;

	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");

            /* Size being overrided below ... */

			//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;

	}

    /* Just for recorded content */

	if (ret == TRUE && file_transfer != NULL) {

		file_info->size =

		    gmyth_file_transfer_get_filesize (file_transfer);

        file_info->valid_fields |= GNOME_VFS_FILE_INFO_FIELDS_SIZE;

		if (file_transfer)

			g_object_unref (file_transfer);

	}

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)

{

}