/*
 * @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>

#define GST_MYTHTV_ID_NUM               1
#define MYTHTV_VERSION_DEFAULT          30
#define MYTHTV_TRANSFER_MAX_WAITS       100

#define MYTHTV_BUFFER_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;
    gint 							channel_num;
    
    gint mythtv_version;
    guint64 content_size;
    guint64 bytes_read;

    GByteArray *buffer;
    gsize buffer_remain;
} MythtvHandle;



static GnomeVFSResult
do_open (GnomeVFSMethod *method,
         GnomeVFSMethodHandle **method_handle,
         GnomeVFSURI *uri,
         GnomeVFSOpenMode mode,
         GnomeVFSContext *context)
{
    MythtvHandle *myth_handle;
    GMythBackendInfo *backend_info;
    GMythURI *gmyth_uri = NULL;
    gboolean ret = TRUE;
    gboolean is_livetv = FALSE;
    gint wait_to_transfer = 0;

    _GNOME_VFS_METHOD_PARAM_CHECK (method_handle != NULL);
    _GNOME_VFS_METHOD_PARAM_CHECK (uri != NULL);

    myth_handle = g_new0 (MythtvHandle, 1);

    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;
    }

    /* 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 = -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 ), "" ) );
	  
	  /* Connect to the backend */	  
	  if ( gmyth_uri != NULL && ( is_livetv = gmyth_uri_is_livetv( gmyth_uri ) ) == TRUE ) {
	    myth_handle->livetv = gmyth_livetv_new ();
	    
	    myth_handle->channel_num = gmyth_uri_get_channel_num( gmyth_uri );
	
	    if ( myth_handle->channel_num != -1 ) {
	      if (gmyth_livetv_channel_setup (myth_handle->livetv, myth_handle->channel_num,
	              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;
	      }
	    }
	
	    myth_handle->file_transfer = gmyth_livetv_create_file_transfer (myth_handle->livetv);
	
	    if (NULL == myth_handle->file_transfer) {
	      ret = FALSE;
	    }
	    
	    if ( gmyth_uri != NULL )
	    	g_object_unref( gmyth_uri );
	    	
	  } else {
	
	    myth_handle->file_transfer = gmyth_file_transfer_new (backend_info);
	    
	    /* Verifies if the file exists */
	    if (!gmyth_util_file_exists (backend_info, gnome_vfs_uri_get_path (uri))) {
	        g_object_unref (backend_info);
					return GNOME_VFS_ERROR_NOT_FOUND;
	    }
	    
	    /* sets the Playback monitor connection */
	    ret = gmyth_file_transfer_open ( myth_handle->file_transfer, gnome_vfs_uri_get_path (uri) );
		
	  } /* if - LiveTV or not? */
	  
    if (ret == FALSE) {
	    g_warning ("MythTV FileTransfer open error\n");
	    return GNOME_VFS_ERROR_NOT_OPEN;
	  } 
	
	  if ( is_livetv == TRUE && ret == TRUE ) {
	    /* loop finished, set the max tries variable to zero again... */
	    wait_to_transfer = 0;
	
	    while ( wait_to_transfer++ < MYTHTV_TRANSFER_MAX_WAITS &&
	        (gmyth_livetv_is_recording (myth_handle->livetv) == FALSE))
	      g_usleep (500);
	
	    /* IS_RECORDING again, just like the MythTV backend does... */
	    gmyth_livetv_is_recording (myth_handle->livetv);
	
	    sleep (4);                  /* FIXME: this is evil (tpm) */
	  }

    g_object_unref (backend_info);

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

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

    *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;

    *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. */
  
    if ( bytes_to_read > myth_handle->buffer_remain ) {
        GByteArray *tmp_buffer = g_byte_array_new();

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

	if (len < 0) {
            g_byte_array_free (tmp_buffer, TRUE);
            g_warning ("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;
	}

        myth_handle->buffer = g_byte_array_append (myth_handle->buffer,
    		tmp_buffer->data, len);

		myth_handle->buffer_remain += len;

        g_byte_array_free (tmp_buffer, TRUE);
    	tmp_buffer = NULL;    	
    }
    
    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);
    *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 (myth_handle->file_transfer) {
	    gmyth_file_transfer_close (myth_handle->file_transfer);
        g_object_unref (myth_handle->file_transfer);
    	myth_handle->file_transfer = NULL;
    }
    
    if (myth_handle->livetv) {
      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;
    }

    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)
{
    GMythFileTransfer *file_transfer = NULL;
    GMythBackendInfo *backend_info = NULL;

    file_info->name = g_strdup (gnome_vfs_uri_get_path (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;

    backend_info = gmyth_backend_info_new_full (gnome_vfs_uri_get_host_name (uri),
            gnome_vfs_uri_get_user_name (uri),
            gnome_vfs_uri_get_password (uri),
            NULL,
            gnome_vfs_uri_get_host_port (uri));

    file_transfer = gmyth_file_transfer_new (backend_info);
    if (gmyth_file_transfer_open (file_transfer, gnome_vfs_uri_get_path (uri)) == TRUE) {
        file_info->size = gmyth_file_transfer_get_filesize (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;
    }

    g_object_unref (file_transfer);
    g_object_unref (backend_info);
    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)
{
}