/* Copyright (C) 2010 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "precompiled.h"

#include "simulation2/system/Component.h"
#include "ICmpTerrain.h"

#include "ICmpObstructionManager.h"
#include "ICmpRangeManager.h"
#include "simulation2/MessageTypes.h"

#include "graphics/Terrain.h"

class CCmpTerrain : public ICmpTerrain
{
public:
	static void ClassInit(CComponentManager& UNUSED(componentManager))
	{
	}

	DEFAULT_COMPONENT_ALLOCATOR(Terrain)

	CTerrain* m_Terrain; // not null

	static std::string GetSchema()
	{
		return "<a:component type='system'/><empty/>";
	}

	virtual void Init(const CParamNode& UNUSED(paramNode))
	{
		m_Terrain = &GetSimContext().GetTerrain();
	}

	virtual void Deinit()
	{
	}

	virtual void Serialize(ISerializer& UNUSED(serialize))
	{
	}

	virtual void Deserialize(const CParamNode& paramNode, IDeserializer& UNUSED(deserialize))
	{
		Init(paramNode);
	}

	virtual CFixedVector3D CalcNormal(entity_pos_t x, entity_pos_t z)
	{
		CFixedVector3D normal;
		m_Terrain->CalcNormalFixed((x / (int)CELL_SIZE).ToInt_RoundToZero(), (z / (int)CELL_SIZE).ToInt_RoundToZero(), normal);
		return normal;
	}

	virtual entity_pos_t GetGroundLevel(entity_pos_t x, entity_pos_t z)
	{
		// TODO: this can crash if the terrain heightmap isn't initialised yet

		return m_Terrain->GetExactGroundLevelFixed(x, z);
	}

	virtual float GetExactGroundLevel(float x, float z)
	{
		return m_Terrain->GetExactGroundLevel(x, z);
	}

	virtual uint32_t GetVerticesPerSide()
	{
		return m_Terrain->GetVerticesPerSide();
	}

	virtual CTerrain* GetCTerrain()
	{
		return m_Terrain;
	}

	virtual void ReloadTerrain()
	{
		// TODO: should refactor this code to be nicer

		CmpPtr<ICmpObstructionManager> cmpObstructionManager(GetSimContext(), SYSTEM_ENTITY);
		if (!cmpObstructionManager.null())
		{
			cmpObstructionManager->SetBounds(entity_pos_t::Zero(), entity_pos_t::Zero(),
					entity_pos_t::FromInt(m_Terrain->GetTilesPerSide()*CELL_SIZE),
					entity_pos_t::FromInt(m_Terrain->GetTilesPerSide()*CELL_SIZE));
		}

		CmpPtr<ICmpRangeManager> cmpRangeManager(GetSimContext(), SYSTEM_ENTITY);
		if (!cmpRangeManager.null())
		{
			cmpRangeManager->SetBounds(entity_pos_t::Zero(), entity_pos_t::Zero(),
					entity_pos_t::FromInt(m_Terrain->GetTilesPerSide()*CELL_SIZE),
					entity_pos_t::FromInt(m_Terrain->GetTilesPerSide()*CELL_SIZE),
					m_Terrain->GetVerticesPerSide());
		}
	}

	virtual void MakeDirty(ssize_t i0, ssize_t j0, ssize_t i1, ssize_t j1)
	{
		CMessageTerrainChanged msg(i0, j0, i1, j1);
		GetSimContext().GetComponentManager().PostMessage(GetEntityId(), msg);
	}
};

REGISTER_COMPONENT_TYPE(Terrain)