/**
 * Copyright (C) 2016 Charybdis Development Team
 * Copyright (C) 2016 Jason Volk
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice is present in all copies.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once
#define HAVE_IRCD_FMT_H

#ifdef __cplusplus
namespace ircd {
namespace fmt  {

IRCD_EXCEPTION(ircd::error, error);
IRCD_EXCEPTION(error, fmtstr_invalid);
IRCD_EXCEPTION(error, fmtstr_mismatch);
IRCD_EXCEPTION(error, fmtstr_illegal);

// module/internal API
extern const char SPECIFIER;

struct spec
{
	char sign;
	int width;
	std::string name;

	spec();
};

using ptrs = std::vector<const void *>;
using types = std::vector<std::type_index>;
using arg = std::tuple<const void *const &, const std::type_index &>;
using handler = std::function<bool (char *&, const size_t &, const spec &, const arg &)>;
ssize_t _snprintf(char *const &, const size_t &, const char *const &, const ptrs &, const types &);

extern std::map<std::string, handler> handlers;

// public API
template<class... Args>
ssize_t snprintf(char *const &buf, const size_t &max, const char *const &fmt, Args&&... args);


template<class... Args>
ssize_t
snprintf(char *const &buf,
         const size_t &max,
         const char *const &fmt,
         Args&&... args)
{
	static const std::vector<std::type_index> types
	{
		typeid(Args)...
	};

	const std::vector<const void *> ptrs
	{
		std::addressof(args)...
	};

	return _snprintf(buf, max, fmt, ptrs, types);
}

}      // namespace fmt
}      // namespace ircd
#endif // __cplusplus