// DR. ROBOTNIK'S RING RACERS
//-----------------------------------------------------------------------------
// Copyright (C) 2023 by James Robert Roman
//
// This program is free software distributed under the
// terms of the GNU General Public License, version 2.
// See the 'LICENSE' file for more details.
//-----------------------------------------------------------------------------

#ifndef objects_broly_hpp
#define objects_broly_hpp

#include <type_traits>

#include "objects.hpp"

#include "../info.h"
#include "../m_easing.h"

namespace srb2::objects
{

struct Broly : Mobj
{
	static constexpr mobjtype_t kMobjType = MT_BROLY;

	/* An object may not be visible on the same tic:
	   1) that it spawned
	   2) that it cycles to the next state */
	static constexpr int kBufferTics = 2;

	void extravalue1() = delete;
	tic_t duration() const { return mobj_t::extravalue1; }
	void duration(tic_t n) { mobj_t::extravalue1 = n; }

	void threshold() = delete;
	void extravalue2() = delete;
	Vec2<Fixed> size() const { return {mobj_t::threshold, mobj_t::extravalue2}; }
	void size(const Vec2<Fixed>& n)
	{
		mobj_t::threshold = n.x;
		mobj_t::extravalue2 = n.y;
	}

	bool valid() const { return duration(); }

	tic_t remaining() const { return tics - kBufferTics; }

	Fixed linear() const { return (remaining() * FRACUNIT) / duration(); }

	template <typename T>
	static T* spawn(Mobj* source, tic_t duration, const Vec2<Fixed>& size)
	{
		static_assert(std::is_base_of_v<Broly, T>);

		if (duration == 0)
		{
			return nullptr;
		}

		T* x = Mobj::spawn<T>(source->center(), T::kMobjType);

		x->target(source);

		// Shrink into center of source object.
		x->z -= x->height / 2;

		x->size(size);
		x->duration(duration);

		x->tics = (duration + kBufferTics);

		return x;
	}

	bool think()
	{
		if (!valid())
		{
			remove();
			return false;
		}

		const Fixed center = z + (height / 2);
		const Vec2<Fixed> v = size();

		scale(Easing_OutSine(linear(), v.y, v.x));
		z = center - (height / 2);

		return true;
	}
};

}; // namespace srb2::objects

#endif/*objects_broly_hpp*/