/*

  * @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;

     gchar *tmp_str1;

     gchar *tmp_str2;

 	_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 */

         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);

         g_free (tmp_str1);

         g_free (tmp_str2);

 		/* creates an instance of  */

         tmp_str1 = gnome_vfs_uri_to_string (uri, GNOME_VFS_URI_HIDE_NONE);

         tmp_str2 = gnome_vfs_unescape_string (tmp_str1, "");

 		gmyth_uri = gmyth_uri_new_with_value (tmp_str2);

         g_free (tmp_str1);

         g_free (tmp_str2);

 		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;

     gchar *tmp_str1;

     gchar *tmp_str2;

 	gboolean ret = TRUE;

 	gboolean res = TRUE;

 	/* Creates and fills out the backend info structure */        

     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);

     g_free (tmp_str1);

     g_free (tmp_str2);

 	/* creates an instance of */

     tmp_str1 = gnome_vfs_uri_to_string (uri, GNOME_VFS_URI_HIDE_NONE);

     tmp_str2 = gnome_vfs_unescape_string (tmp_str1, "");

 	gmyth_uri = gmyth_uri_new_with_value (tmp_str2);

     g_free (tmp_str1);

     g_free (tmp_str2);

 	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)

 {

 }