/**
 * Move a single file named $p_basename from $p_file_path_from to $p_file_path_to
*/
function file_move_bug_attachment( $p_basename, $p_file_path_from, $p_file_path_to ) {
	$t_method = config_get( 'file_upload_method' );
	$t_disk_file_name_from = file_path_combine( $p_file_path_from, $p_basename );
	$t_disk_file_name_to = file_path_combine( $p_file_path_to, $p_basename );

	switch( $t_method ) {
		case FTP:
		case DISK:
			file_ensure_valid_upload_path( $p_file_path_from );
			file_ensure_valid_upload_path( $p_file_path_to );

			if( !file_exists( $t_disk_file_name_to ) ) {
				if ( function_exists('link') ) {
					if( !link( $t_disk_file_name_from, $t_disk_file_name_to ) ) {
						trigger_error( FILE_MOVE_FAILED, ERROR );
					}

					chmod( $t_disk_file_name_to, config_get( 'attachments_file_permissions' ) );
					file_delete_local( $t_disk_file_name_from ); 
				} else { // Windows doesn't support link, so simulate a link
					if ( !rename( $t_disk_file_name_from, $t_disk_file_name_to ) ) {
						if ( !copy( $t_disk_file_name_from, $t_disk_file_name_to ) ) {
							trigger_error( FILE_MOVE_FAILED, ERROR );
						}
						file_delete_local( $t_disk_file_name_from );
					}
					chmod( $t_disk_file_name_to, config_get( 'attachments_file_permissions' ) );
				}
			} else {
				trigger_error( ERROR_FILE_DUPLICATE, ERROR );
			}
			break;
		case DATABASE:
			break;
		default:
			trigger_error( ERROR_GENERIC, ERROR );
	}

	return true;
}

/**
 * Move any attachements as needed when a bug is moved from project to project
 *
 * @param integer $p_bug_id the bug id
 * @param integer $p_project_id_from the project id the bug was in
 * @param integer $p_project_id_to the project id the bug was moved to
 */
function file_move_bug_attachments( $p_bug_id, $p_project_id_from, $p_project_id_to ) {
	if ( $p_project_id_from == $p_project_id_to ) {
		return true;
	}

	if ( file_bug_has_attachments($p_bug_id) == true && config_get( 'file_upload_method' ) != DATABASE ){
		$t_path_from = project_get_field( $p_project_id_from, 'file_path' );
		if ( is_blank( $t_path_from ) ) {
			$t_path_from = config_get( 'absolute_path_default_upload_folder' );
		} 
		$t_path_to = project_get_field( $p_project_id_to, 'file_path' );
		if ( is_blank( $t_path_to ) ) {
			$t_path_to = config_get( 'absolute_path_default_upload_folder' );
		}
		if ( $t_path_from == $t_path_to ) {
			return true;
		} 

		$t_attachment_rows = bug_get_attachments( $p_bug_id );
		$t_attachments_count = count( $t_attachment_rows );
		$t_bug_file_table = db_get_table( 'mantis_bug_file_table' );
		$c_bug_id = db_prepare_int( $p_bug_id );

		for( $i = 0;$i < $t_attachments_count;$i++ ) {
			$t_row = $t_attachment_rows[$i];
			$t_basename = basename( $t_row['diskfile'] );

			file_move_bug_attachment( $t_basename, $t_path_from, $t_path_to);
	
			# Update the corresponding db record
			$query = "UPDATE $t_bug_file_table
					  SET folder=" . db_param() . "
					  WHERE bug_id=" . db_param() . "
					  AND id =" . db_param();
			db_query_bound( $query, Array( db_prepare_string( $t_path_to ), $c_bug_id, db_prepare_int( $t_row['id'] ) ) );
		}
	}
}