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/*
 * Copyright (C) 2014 Martin Willi
 * Copyright (C) 2014 revosec AG
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * 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.
 */

/**
 * @defgroup vici_builder vici_builder
 * @{ @ingroup vici
 */

#ifndef VICI_BUILDER_H_
#define VICI_BUILDER_H_

#include "vici_message.h"

typedef struct vici_builder_t vici_builder_t;

/**
 * Build helper for vici message
 */
struct vici_builder_t {

	/**
	 * Append a generic message element to message.
	 *
	 * The additional arguments are type specific, it may be nothing, a string,
	 * a chunk value or both.
	 *
	 * @param type	element type to add
	 * @param ...	additional type specific arguments
	 */
	void (*add)(vici_builder_t *this, vici_type_t type, ...);

	/**
	 * Append a key/value element using a format string.
	 *
	 * Instead of passing the type specific value as a chunk, this method
	 * takes a printf() style format string followed by its arguments. The
	 * key name for a key/value type is still a fixed string.
	 *
	 * @param key	key name of the key/value to add
	 * @param fmt	value format string
	 * @param ...	arguments to value format string
	 */
	void (*add_kv)(vici_builder_t *this, char *key, char *fmt, ...);

	/**
	 * Append a message element using a format string and va_list.
	 *
	 * Instead of passing the type specific value as a chunk, this method
	 * takes a printf() style format string followed by its arguments. The
	 * key name for a key/value type is still a fixed string.
	 *
	 * @param key	key name of the key/value to add
	 * @param fmt	value format string
	 * @param args	arguments to value format string
	 */
	void (*vadd_kv)(vici_builder_t *this, char *key, char *fmt, va_list args);

	/**
	 * Append a list item element using a format string.
	 *
	 * Instead of passing the type specific value as a chunk, this method
	 * takes a printf() style format string followed by its arguments.
	 *
	 * @param fmt	value format string
	 * @param ...	arguments to value format string
	 */
	void (*add_li)(vici_builder_t *this, char *fmt, ...);

	/**
	 * Append a list item element using a format string and va_list.
	 *
	 * Instead of passing the type specific value as a chunk, this method
	 * takes a printf() style format string followed by its arguments.
	 *
	 * @param fmt	value format string
	 * @param args	arguments to value format string
	 */
	void (*vadd_li)(vici_builder_t *this, char *fmt, va_list args);

	/**
	 * Begin a new section.
	 *
	 * @param name	name of section to begin
	 */
	void (*begin_section)(vici_builder_t *this, char *name);

	/**
	 * End the currently open section.
	 */
	void (*end_section)(vici_builder_t *this);

	/**
	 * Begin a new list.
	 *
	 * @param name	name of list to begin
	 */
	void (*begin_list)(vici_builder_t *this, char *name);

	/**
	 * End the currently open list.
	 */
	void (*end_list)(vici_builder_t *this);

	/**
	 * Finalize a vici message with all added elements, destroy builder.
	 *
	 * @return		vici message, NULL on error
	 */
	vici_message_t* (*finalize)(vici_builder_t *this);

	/**
	 * Destroy a vici builder without finalization.
	 *
	 * Note that finalize() already destroys the message, and calling destroy()
	 * is required only if the message does not get finalize()d.
	 */
	void (*destroy)(vici_builder_t *this);
};

/**
 * Create a vici_builder instance.
 */
vici_builder_t *vici_builder_create();

#endif /** VICI_BUILDER_H_ @}*/