/*
 * Copyright (C) 2016 Charybdis Development Team
 * Copyright (C) 2016 Jason Volk <jason@zemos.net>
 *
 * 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_JS_FUNCTION_NATIVE

namespace ircd {
namespace js   {

struct function::native
:root<JSFunction *>
{
	using closure = std::function<value (object::handle, value::handle, const args &)>;

	const char *_name;
	closure lambda;

  protected:
	virtual value on_call(object::handle callee, value::handle that, const args &);
	virtual value on_new(object::handle callee, const args &);

  private:
	static function::native &from(JSObject *const &);
	static bool handle_call(JSContext *, unsigned, JS::Value *) noexcept;

  public:
	uint16_t arity() const;
	string display_name() const;
	string name() const;

	value operator()(const object::handle &, const vector<value>::handle &) const;
	template<class... args> value operator()(const object::handle &, args&&...) const;

	native(const char *const &name   = "<native>",
	       const uint &flags         = 0,
	       const uint &arity         = 0,
	       const closure &           = {});

	native(native &&) = delete;
	native(const native &) = delete;
	virtual ~native() noexcept;
};

template<class... args>
value
function::native::operator()(const object::handle &that,
                             args&&... a)
const
{
	const vector<value> argv
	{
		std::forward<args>(a)...
	};

	const vector<value>::handle handle(argv);
	return operator()(that, handle);
}

} // namespace js
} // namespace ircd