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/*
Minetest
Copyright (C) 2010-2017 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "util/serialize.h"
#include "util/pointedthing.h"
#include "client.h"
#include "clientenvironment.h"
#include "clientsimpleobject.h"
#include "clientmap.h"
#include "scripting_client.h"
#include "mapblock_mesh.h"
#include "mtevent.h"
#include "collision.h"
#include "nodedef.h"
#include "profiler.h"
#include "raycast.h"
#include "voxelalgorithms.h"
#include "settings.h"
#include "shader.h"
#include "content_cao.h"
#include <algorithm>
#include "client/renderingengine.h"

/*
	CAOShaderConstantSetter
*/

//! Shader constant setter for passing material emissive color to the CAO object_shader
class CAOShaderConstantSetter : public IShaderConstantSetter
{
public:
	CAOShaderConstantSetter():
			m_emissive_color_setting("emissiveColor")
	{}

	~CAOShaderConstantSetter() override = default;

	void onSetConstants(video::IMaterialRendererServices *services,
			bool is_highlevel) override
	{
		if (!is_highlevel)
			return;

		// Ambient color
		video::SColorf emissive_color(m_emissive_color);

		float as_array[4] = {
			emissive_color.r,
			emissive_color.g,
			emissive_color.b,
			emissive_color.a,
		};
		m_emissive_color_setting.set(as_array, services);
	}

	void onSetMaterial(const video::SMaterial& material) override
	{
		m_emissive_color = material.EmissiveColor;
	}

private:
	video::SColor m_emissive_color;
	CachedPixelShaderSetting<float, 4> m_emissive_color_setting;
};

class CAOShaderConstantSetterFactory : public IShaderConstantSetterFactory
{
public:
	CAOShaderConstantSetterFactory()
	{}

	virtual IShaderConstantSetter* create()
	{
		return new CAOShaderConstantSetter();
	}
};

/*
	ClientEnvironment
*/

ClientEnvironment::ClientEnvironment(ClientMap *map,
	ITextureSource *texturesource, Client *client):
	Environment(client),
	m_map(map),
	m_texturesource(texturesource),
	m_client(client)
{
	auto *shdrsrc = m_client->getShaderSource();
	shdrsrc->addShaderConstantSetterFactory(new CAOShaderConstantSetterFactory());
}

ClientEnvironment::~ClientEnvironment()
{
	m_ao_manager.clear();

	for (auto &simple_object : m_simple_objects) {
		delete simple_object;
	}

	// Drop/delete map
	m_map->drop();

	delete m_local_player;
}

Map & ClientEnvironment::getMap()
{
	return *m_map;
}

ClientMap & ClientEnvironment::getClientMap()
{
	return *m_map;
}

void ClientEnvironment::setLocalPlayer(LocalPlayer *player)
{
	/*
		It is a failure if already is a local player
	*/
	FATAL_ERROR_IF(m_local_player != NULL,
		"Local player already allocated");

	m_local_player = player;
}

void ClientEnvironment::step(float dtime)
{
	/* Step time of day */
	stepTimeOfDay(dtime);

	// Get some settings
	bool fly_allowed = m_client->checkLocalPrivilege("fly");
	bool free_move = fly_allowed && g_settings->getBool("free_move");

	// Get local player
	LocalPlayer *lplayer = getLocalPlayer();
	assert(lplayer);
	// collision info queue
	std::vector<CollisionInfo> player_collisions;

	/*
		Get the speed the player is going
	*/
	bool is_climbing = lplayer->is_climbing;