// MIT License

// Copyright (c) 2019 Erin Catto

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#ifndef TEST_H
#define TEST_H

#include "box2d/box2d.h"
#include "draw.h"

#include <stdlib.h>

struct Settings;
class Test;

#define	RAND_LIMIT 32767

/// Random number in range [-1,1]
inline float RandomFloat()
{
	float r = (float)(rand() & (RAND_LIMIT));
	r /= RAND_LIMIT;
	r = 2.0f * r - 1.0f;
	return r;
}

/// Random floating point number in range [lo, hi]
inline float RandomFloat(float lo, float hi)
{
	float r = (float)(rand() & (RAND_LIMIT));
	r /= RAND_LIMIT;
	r = (hi - lo) * r + lo;
	return r;
}

// This is called when a joint in the world is implicitly destroyed
// because an attached body is destroyed. This gives us a chance to
// nullify the mouse joint.
class DestructionListener : public b2DestructionListener
{
public:
	void SayGoodbye(b2Fixture* fixture) override { B2_NOT_USED(fixture); }
	void SayGoodbye(b2Joint* joint) override;

	Test* test;
};

const int32 k_maxContactPoints = 2048;

struct ContactPoint
{
	b2Fixture* fixtureA;
	b2Fixture* fixtureB;
	b2Vec2 normal;
	b2Vec2 position;
	b2PointState state;
	float normalImpulse;
	float tangentImpulse;
	float separation;
};

class Test : public b2ContactListener
{
public:

	Test();
	virtual ~Test();

	void DrawTitle(const char* string);
	virtual void Step(Settings& settings);
	virtual void UpdateUI() {}
	virtual void Keyboard(int key) { B2_NOT_USED(key); }
	virtual void KeyboardUp(int key) { B2_NOT_USED(key); }
	void ShiftMouseDown(const b2Vec2& p);
	virtual void MouseDown(const b2Vec2& p);
	virtual void MouseUp(const b2Vec2& p);
	virtual void MouseMove(const b2Vec2& p);
	void LaunchBomb();
	void LaunchBomb(const b2Vec2& position, const b2Vec2& velocity);
	
	void SpawnBomb(const b2Vec2& worldPt);
	void CompleteBombSpawn(const b2Vec2& p);

	// Let derived tests know that a joint was destroyed.
	virtual void JointDestroyed(b2Joint* joint) { B2_NOT_USED(joint); }

	// Callbacks for derived classes.
	virtual void BeginContact(b2Contact* contact)  override { B2_NOT_USED(contact); }
	virtual void EndContact(b2Contact* contact)  override { B2_NOT_USED(contact); }
	virtual void PreSolve(b2Contact* contact, const b2Manifold* oldManifold) override;
	virtual void PostSolve(b2Contact* contact, const b2ContactImpulse* impulse) override
	{
		B2_NOT_USED(contact);
		B2_NOT_USED(impulse);
	}

	void ShiftOrigin(const b2Vec2& newOrigin);

protected:
	friend class DestructionListener;
	friend class BoundaryListener;
	friend class ContactListener;

	b2Body* m_groundBody;
	b2AABB m_worldAABB;
	ContactPoint m_points[k_maxContactPoints];
	int32 m_pointCount;
	DestructionListener m_destructionListener;
	int32 m_textLine;
	b2World* m_world;
	b2Body* m_bomb;
	b2MouseJoint* m_mouseJoint;
	b2Vec2 m_bombSpawnPoint;
	bool m_bombSpawning;
	b2Vec2 m_mouseWorld;
	int32 m_stepCount;
	int32 m_textIncrement;
	b2Profile m_maxProfile;
	b2Profile m_totalProfile;
};

typedef Test* TestCreateFcn();

int RegisterTest(const char* category, const char* name, TestCreateFcn* fcn);

//
struct TestEntry
{
	const char* category;
	const char* name;
	TestCreateFcn* createFcn;
};

#define MAX_TESTS 256
extern TestEntry g_testEntries[MAX_TESTS];
extern int g_testCount;

#endif