/* Copyright (C) 2023 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 <cfloat>
#include <map>

#include "MessageHandler.h"
#include "../CommandProc.h"
#include "../SimState.h"
#include "../View.h"

#include "graphics/GameView.h"
#include "graphics/Model.h"
#include "graphics/ObjectBase.h"
#include "graphics/ObjectEntry.h"
#include "graphics/ObjectManager.h"
#include "graphics/Terrain.h"
#include "graphics/Unit.h"
#include "lib/utf8.h"
#include "maths/MathUtil.h"
#include "maths/Matrix3D.h"
#include "ps/CLogger.h"
#include "ps/Game.h"
#include "ps/World.h"
#include "renderer/Renderer.h"
#include "renderer/WaterManager.h"
#include "simulation2/Simulation2.h"
#include "simulation2/components/ICmpObstruction.h"
#include "simulation2/components/ICmpOwnership.h"
#include "simulation2/components/ICmpPosition.h"
#include "simulation2/components/ICmpPlayer.h"
#include "simulation2/components/ICmpPlayerManager.h"
#include "simulation2/components/ICmpSelectable.h"
#include "simulation2/components/ICmpTemplateManager.h"
#include "simulation2/components/ICmpVisual.h"
#include "simulation2/helpers/Selection.h"
#include "ps/XML/XMLWriter.h"

namespace AtlasMessage
{

namespace
{
	bool SortObjectsList(const sObjectsListItem& a, const sObjectsListItem& b)
	{
		return wcscmp(a.name.c_str(), b.name.c_str()) < 0;
	}
} // anonymous namespace

// Helpers for object constraints
bool CheckEntityObstruction(entity_id_t ent)
{
	CmpPtr<ICmpObstruction> cmpObstruction(*g_Game->GetSimulation2(), ent);
	if (cmpObstruction)
	{
		ICmpObstruction::EFoundationCheck result = cmpObstruction->CheckFoundation("default");
		if (result != ICmpObstruction::FOUNDATION_CHECK_SUCCESS)
			return false;
	}
	return true;
}

void CheckObstructionAndUpdateVisual(entity_id_t id)
{
	CmpPtr<ICmpVisual> cmpVisual(*g_Game->GetSimulation2(), id);
	if (cmpVisual)
	{
		if (!CheckEntityObstruction(id))
			cmpVisual->SetShadingColor(fixed::FromDouble(1.4), fixed::FromDouble(0.4), fixed::FromDouble(0.4), fixed::FromDouble(1));
		else
			cmpVisual->SetShadingColor(fixed::FromDouble(1), fixed::FromDouble(1), fixed::FromDouble(1), fixed::FromDouble(1));
	}
}

QUERYHANDLER(GetObjectsList)
{
	std::vector<sObjectsListItem> objects;

	CmpPtr<ICmpTemplateManager> cmpTemplateManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
	if (cmpTemplateManager)
	{
		std::vector<std::string> names = cmpTemplateManager->FindAllTemplates(true);

		for (std::vector<std::string>::iterator it = names.begin(); it != names.end(); ++it)
		{
			std::wstring name(it->begin(), it->end());

			sObjectsListItem e;
			e.id = name;
			if (name.substr(0, 6) == L"actor|")
			{
				e.name = name.substr(6);
				e.type = 1;
			}
			else
			{
				e.name = name;
				e.type = 0;
			}
			objects.push_back(e);
		}
	}

	std::sort(objects.begin(), objects.end(), SortObjectsList);
	msg->objects = objects;
}


static std::vector<entity_id_t> g_Selection;
typedef std::map<player_id_t, CColor> PlayerColorMap;

// Helper function to find color of player owning the given entity,
//	returns white if entity has no owner. Uses caching to avoid
//	expensive script calls.
static CColor GetOwnerPlayerColor(PlayerColorMap& colorMap, entity_id_t id)
{
	// Default color - white
	CColor color(1.0f, 1.0f, 1.0f, 1.0f);

	CSimulation2& sim = *g_Game->GetSimulation2();
	CmpPtr<ICmpOwnership> cmpOwnership(sim, id);
	if (cmpOwnership)
	{
		player_id_t owner = cmpOwnership->GetOwner();
		if (colorMap.find(owner) != colorMap.end())
			return colorMap[owner];
		else
		{
			CmpPtr<ICmpPlayerManager> cmpPlayerManager(sim, SYSTEM_ENTITY);
			entity_id_t playerEnt = cmpPlayerManager->GetPlayerByID(owner);
			CmpPtr<ICmpPlayer> cmpPlayer(sim, playerEnt);
			if (cmpPlayer)
			{
				colorMap[owner] = cmpPlayer->GetDisplayedColor();
				color = colorMap[owner];
			}
		}
	}
	return color;
}

MESSAGEHANDLER(SetSelectionPreview)
{
	CSimulation2& sim = *g_Game->GetSimulation2();

	// Cache player colors for performance
	PlayerColorMap playerColors;

	// Clear old selection rings
	for (size_t i = 0; i < g_Selection.size(); ++i)
	{
		// We can't set only alpha here, because that won't trigger desaturation
		//	so we set the complete color (not too evil since it's cached)
		CmpPtr<ICmpSelectable> cmpSelectable(sim, g_Selection[i]);
		if (cmpSelectable)
		{
			CColor color = GetOwnerPlayerColor(playerColors, g_Selection[i]);
			color.a = 0.0f;
			cmpSelectable->SetSelectionHighlight(color, false);
		}
	}

	g_Selection = *msg->ids;

	// Set new selection rings
	for (size_t i = 0; i < g_Selection.size(); ++i)
	{
		CmpPtr<ICmpSelectable> cmpSelectable(sim, g_Selection[i]);
		if (cmpSelectable)
			cmpSelectable->SetSelectionHighlight(GetOwnerPlayerColor(playerColors, g_Selection[i]), true);
	}
}

QUERYHANDLER(GetObjectSettings)
{
	AtlasView* view = AtlasView::GetView(msg->view);
	CSimulation2* simulation = view->GetSimulation2();

	sObjectSettings settings;
	settings.player = 0;

	CmpPtr<ICmpOwnership> cmpOwnership(*simulation, view->GetEntityId(msg->id));
	if (cmpOwnership)
	{
		int32_t player = cmpOwnership->GetOwner();
		if (player != -1)
			settings.player = player;
	}

	// TODO: selections

/*
	// Get the unit's possible variants and selected variants
	std::vector<std::vector<CStr> > groups = unit->GetObject().m_Base->GetVariantGroups();
	const std::set<CStr>& selections = unit->GetActorSelections();

	// Iterate over variant groups
	std::vector<std::vector<std::wstring> > variantgroups;
	std::set<std::wstring> selections_set;
	variantgroups.reserve(groups.size());
	for (size_t i = 0; i < groups.size(); ++i)
	{
		// Copy variants into output structure

		std::vector<std::wstring> group;
		group.reserve(groups[i].size());
		int choice = -1;

		for (size_t j = 0; j < groups[i].size(); ++j)
		{
			group.push_back(CStrW(groups[i][j]));

			// Find the first string in 'selections' that matches one of this
			// group's variants
			if (choice == -1)
				if (selections.find(groups[i][j]) != selections.end())
					choice = (int)j;
		}

		// Assuming one of the variants was selected (which it really ought
		// to be), remember that one's name
		if (choice != -1)
			selections_set.insert(CStrW(groups[i][choice]));

		variantgroups.push_back(group);
	}

	settings.variantgroups = variantgroups;
	settings.selections = std::vector<std::wstring> (selections_set.begin(), selections_set.end()); // convert set->vector
*/

	msg->settings = settings;
}

QUERYHANDLER(GetObjectMapSettings)
{
	std::vector<entity_id_t> ids = *msg->ids;

	CmpPtr<ICmpTemplateManager> cmpTemplateManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
	ENSURE(cmpTemplateManager);

	XMLWriter_File exampleFile;
	{
		XMLWriter_Element entitiesTag(exampleFile, "Entities");
		{
			for (entity_id_t id : ids)
			{
				XMLWriter_Element entityTag(exampleFile, "Entity");
				{
					//Template name
					entityTag.Setting("Template", cmpTemplateManager->GetCurrentTemplateName(id));

					//Player
					CmpPtr<ICmpOwnership> cmpOwnership(*g_Game->GetSimulation2(), id);
					if (cmpOwnership)
						entityTag.Setting("Player", static_cast<int>(cmpOwnership->GetOwner()));

					//Adding position to make some relative position later
					CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), id);
					if (cmpPosition)
					{
						CFixedVector3D pos = cmpPosition->GetPosition();
						CFixedVector3D rot = cmpPosition->GetRotation();
						{
							XMLWriter_Element positionTag(exampleFile, "Position");
							positionTag.Attribute("x", pos.X);
							positionTag.Attribute("z", pos.Z);
							// TODO: height offset etc
						}
						{
							XMLWriter_Element orientationTag(exampleFile, "Orientation");
							orientationTag.Attribute("y", rot.Y);
							// TODO: X, Z maybe
						}
					}

					// Adding actor seed
					CmpPtr<ICmpVisual> cmpVisual(*g_Game->GetSimulation2(), id);
					if (cmpVisual)
						entityTag.Setting("ActorSeed", static_cast<unsigned int>(cmpVisual->GetActorSeed()));
				}
			}
		}
	}

	const CStr& data = exampleFile.GetOutput();
	msg->xmldata = data.FromUTF8();
}


BEGIN_COMMAND(SetObjectSettings)
{
	player_id_t m_PlayerOld, m_PlayerNew;
	std::set<CStr> m_SelectionsOld, m_SelectionsNew;

	void Do()
	{
		sObjectSettings settings = msg->settings;

		AtlasView* view = AtlasView::GetView(msg->view);
		CSimulation2* simulation = view->GetSimulation2();

		CmpPtr<ICmpOwnership> cmpOwnership(*simulation, view->GetEntityId(msg->id));
		m_PlayerOld = 0;
		if (cmpOwnership)
		{
			int32_t player = cmpOwnership->GetOwner();
			if (player != -1)
				m_PlayerOld = player;
		}

		// TODO: selections
//		m_SelectionsOld = unit->GetActorSelections();

		m_PlayerNew = (player_id_t)settings.player;

		std::vector<std::wstring> selections = *settings.selections;
		for (std::vector<std::wstring>::iterator it = selections.begin(); it != selections.end(); ++it)
		{
			m_SelectionsNew.insert(CStrW(*it).ToUTF8());
		}

		Redo();
	}

	void Redo()
	{
		Set(m_PlayerNew, m_SelectionsNew);
	}

	void Undo()
	{
		Set(m_PlayerOld, m_SelectionsOld);
	}

private:
	void Set(player_id_t player, const std::set<CStr>& UNUSED(selections))
	{
		AtlasView* view = AtlasView::GetView(msg->view);
		CSimulation2* simulation = view->GetSimulation2();

		CmpPtr<ICmpOwnership> cmpOwnership(*simulation, view->GetEntityId(msg->id));
		if (cmpOwnership)
			cmpOwnership->SetOwner(player);

		// TODO: selections
//		unit->SetActorSelections(selections);
	}
};
END_COMMAND(SetObjectSettings);

//////////////////////////////////////////////////////////////////////////

static CStrW g_PreviewUnitName;
static entity_id_t g_PreviewEntityID = INVALID_ENTITY;
static std::vector<entity_id_t> g_PreviewEntitiesID;

static CVector3D GetUnitPos(const Position& pos, bool floating)
{
	static CVector3D vec;
	vec = pos.GetWorldSpace(vec, floating); // if msg->pos is 'Unchanged', use the previous pos

	// Clamp the position to the edges of the world:

	// Use 'Clamp' with a value slightly less than the width, so that converting
	// to integer (rounding towards zero) will put it on the tile inside the edge
	// instead of just outside
	const float mapWidth = (g_Game->GetWorld()->GetTerrain().GetVerticesPerSide()-1)*TERRAIN_TILE_SIZE;
	float delta = 1e-6f; // fraction of map width - must be > FLT_EPSILON

	float xOnMap = Clamp(vec.X, 0.f, mapWidth * (1.f - delta));
	float zOnMap = Clamp(vec.Z, 0.f, mapWidth * (1.f - delta));

	// Don't waste time with GetExactGroundLevel unless we've changed
	if (xOnMap != vec.X || zOnMap != vec.Z)
	{
		vec.X = xOnMap;
		vec.Z = zOnMap;
		vec.Y = g_Game->GetWorld()->GetTerrain().GetExactGroundLevel(xOnMap, zOnMap);
	}

	return vec;
}

QUERYHANDLER(GetCurrentSelection)
{
	msg->ids = g_Selection;
}

MESSAGEHANDLER(ObjectPreviewToEntity)
{
	UNUSED2(msg);

	if (g_PreviewEntitiesID.size() == 0)
		return;

	CmpPtr<ICmpTemplateManager> cmpTemplateManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
	ENSURE(cmpTemplateManager);

	PlayerColorMap playerColor;

	//I need to re create the objects finally delete preview objects
	for (entity_id_t ent : g_PreviewEntitiesID)
	{
		//Get template name (without the "preview|" prefix)
		std::wstring wTemplateName = wstring_from_utf8(cmpTemplateManager->GetCurrentTemplateName(ent).substr(8));
		//Create new entity
		entity_id_t new_ent = g_Game->GetSimulation2()->AddEntity(wTemplateName);
		if (new_ent == INVALID_ENTITY)
			continue;

		//get position, get rotation
		CmpPtr<ICmpPosition> cmpPositionNew(*g_Game->GetSimulation2(), new_ent);
		CmpPtr<ICmpPosition> cmpPositionOld(*g_Game->GetSimulation2(), ent);

		if (cmpPositionNew && cmpPositionOld)
		{
			CVector3D pos = cmpPositionOld->GetPosition();
			cmpPositionNew->JumpTo(entity_pos_t::FromFloat(pos.X), entity_pos_t::FromFloat(pos.Z));

			//now rotate
			CFixedVector3D rotation = cmpPositionOld->GetRotation();
			cmpPositionNew->SetYRotation(rotation.Y);
		}

		//get owner
		CmpPtr<ICmpOwnership> cmpOwnershipNew(*g_Game->GetSimulation2(), new_ent);
		CmpPtr<ICmpOwnership> cmpOwnershipOld(*g_Game->GetSimulation2(), ent);
		if (cmpOwnershipNew && cmpOwnershipOld)
			cmpOwnershipNew->SetOwner(cmpOwnershipOld->GetOwner());

		//getVisual
		CmpPtr<ICmpVisual> cmpVisualNew(*g_Game->GetSimulation2(), new_ent);
		CmpPtr<ICmpVisual> cmpVisualOld(*g_Game->GetSimulation2(), ent);
		if (cmpVisualNew && cmpVisualOld)
			cmpVisualNew->SetActorSeed(cmpVisualOld->GetActorSeed());

		//Update g_selectedObject and higligth
		g_Selection.push_back(new_ent);
		CmpPtr<ICmpSelectable> cmpSelectable(*g_Game->GetSimulation2(), new_ent);
		if (cmpSelectable)
			cmpSelectable->SetSelectionHighlight(GetOwnerPlayerColor(playerColor, new_ent), true);

		g_Game->GetSimulation2()->DestroyEntity(ent);
	}
	g_PreviewEntitiesID.clear();

}

MESSAGEHANDLER(MoveObjectPreview)
{
	if (g_PreviewEntitiesID.size()==0)
		return;

	//TODO:Change pivot
	entity_id_t referenceEntity = *g_PreviewEntitiesID.begin();

	// All selected objects move relative to a pivot object,
	//	so get its position and whether it's floating
	CFixedVector3D referencePos;

	CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), referenceEntity);
	if (cmpPosition && cmpPosition->IsInWorld())
		referencePos = cmpPosition->GetPosition();


	// Calculate directional vector of movement for pivot object,
	//	we apply the same movement to all objects
	CVector3D targetPos = GetUnitPos(msg->pos, true);
	CFixedVector3D fTargetPos(entity_pos_t::FromFloat(targetPos.X), entity_pos_t::FromFloat(targetPos.Y), entity_pos_t::FromFloat(targetPos.Z));
	CFixedVector3D dir = fTargetPos - referencePos;

	for (const entity_id_t id : g_PreviewEntitiesID)
	{
		CmpPtr<ICmpPosition> cmpPreviewPosition(*g_Game->GetSimulation2(), id);
		if (cmpPreviewPosition)
		{
			CFixedVector3D posFinal;
			if (cmpPreviewPosition->IsInWorld())
			{
				// Calculate this object's position
				CFixedVector3D posFixed = cmpPreviewPosition->GetPosition();
				posFinal = posFixed + dir;
			}
			cmpPreviewPosition->JumpTo(posFinal.X, posFinal.Z);
		}

		CheckObstructionAndUpdateVisual(id);
	}
}

MESSAGEHANDLER(ObjectPreview)
{
	// If the selection has changed...
	if (*msg->id != g_PreviewUnitName || (!msg->cleanObjectPreviews))
	{
		// Delete old entity
		if (g_PreviewEntityID != INVALID_ENTITY && msg->cleanObjectPreviews)
		{
			//Time to delete all preview objects
			for (entity_id_t ent : g_PreviewEntitiesID)
				g_Game->GetSimulation2()->DestroyEntity(ent);
			g_PreviewEntitiesID.clear();
		}

		// Create the new entity
		if ((*msg->id).empty())
			g_PreviewEntityID = INVALID_ENTITY;
		else
		{
			g_PreviewEntityID = g_Game->GetSimulation2()->AddLocalEntity(L"preview|" + *msg->id);
			g_PreviewEntitiesID.push_back(g_PreviewEntityID);
		}


		g_PreviewUnitName = *msg->id;
	}

	if (g_PreviewEntityID != INVALID_ENTITY)
	{
		// Update the unit's position and orientation:

		CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), g_PreviewEntityID);
		if (cmpPosition)
		{
			CVector3D pos = GetUnitPos(msg->pos, cmpPosition->CanFloat());
			cmpPosition->JumpTo(entity_pos_t::FromFloat(pos.X), entity_pos_t::FromFloat(pos.Z));

			float angle;
			if (msg->usetarget)
			{
				// Aim from pos towards msg->target
				CVector3D target = msg->target->GetWorldSpace(pos.Y);
				angle = atan2(target.X-pos.X, target.Z-pos.Z);
			}
			else
			{
				angle = msg->angle;
			}

			cmpPosition->SetYRotation(entity_angle_t::FromFloat(angle));
		}

		// TODO: handle random variations somehow

		CmpPtr<ICmpVisual> cmpVisual(*g_Game->GetSimulation2(), g_PreviewEntityID);
		if (cmpVisual)
			cmpVisual->SetActorSeed(msg->actorseed);

		CmpPtr<ICmpOwnership> cmpOwnership(*g_Game->GetSimulation2(), g_PreviewEntityID);
		if (cmpOwnership)
			cmpOwnership->SetOwner((player_id_t)msg->settings->player);

		CheckObstructionAndUpdateVisual(g_PreviewEntityID);
	}
}

BEGIN_COMMAND(CreateObject)
{
	CVector3D m_Pos;
	float m_Angle;
	player_id_t m_Player;
	entity_id_t m_EntityID;
	u32 m_ActorSeed;

	void Do()
	{
		// Calculate the position/orientation to create this unit with

		m_Pos = GetUnitPos(msg->pos, true); // don't really care about floating

		if (msg->usetarget)
		{
			// Aim from m_Pos towards msg->target
			CVector3D target = msg->target->GetWorldSpace(m_Pos.Y);
			m_Angle = atan2(target.X-m_Pos.X, target.Z-m_Pos.Z);
		}
		else
		{
			m_Angle = msg->angle;
		}

		m_Player = (player_id_t)msg->settings->player;
		m_ActorSeed = msg->actorseed;
		// TODO: variation/selection strings

		Redo();
	}

	void Redo()
	{
		m_EntityID = g_Game->GetSimulation2()->AddEntity(*msg->id);
		if (m_EntityID == INVALID_ENTITY)
			return;

		CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), m_EntityID);
		if (cmpPosition)
		{
			cmpPosition->JumpTo(entity_pos_t::FromFloat(m_Pos.X), entity_pos_t::FromFloat(m_Pos.Z));
			cmpPosition->SetYRotation(entity_angle_t::FromFloat(m_Angle));
		}

		CmpPtr<ICmpOwnership> cmpOwnership(*g_Game->GetSimulation2(), m_EntityID);
		if (cmpOwnership)
			cmpOwnership->SetOwner(m_Player);

		CmpPtr<ICmpVisual> cmpVisual(*g_Game->GetSimulation2(), m_EntityID);
		if (cmpVisual)
		{
			cmpVisual->SetActorSeed(m_ActorSeed);
			// TODO: variation/selection strings
		}
	}

	void Undo()
	{
		if (m_EntityID != INVALID_ENTITY)
		{
			g_Game->GetSimulation2()->DestroyEntity(m_EntityID);
			m_EntityID = INVALID_ENTITY;
		}
	}
};
END_COMMAND(CreateObject)


QUERYHANDLER(PickObject)
{
	float x, y;
	msg->pos->GetScreenSpace(x, y);

	// Normally this function would be called with a player ID to check LOS,
	//	but in Atlas the entire map is revealed, so just pass INVALID_PLAYER
	entity_id_t ent = EntitySelection::PickEntityAtPoint(*g_Game->GetSimulation2(), *g_Game->GetView()->GetCamera(), x, y, INVALID_PLAYER, msg->selectActors);;

	if (ent == INVALID_ENTITY)
		msg->id = INVALID_ENTITY;
	else
	{
		msg->id = ent;
		// Calculate offset of object from original mouse click position
		//	so it gets moved by that offset
		CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), ent);
		if (!cmpPosition || !cmpPosition->IsInWorld())
		{
			// error
			msg->offsetx = msg->offsety = 0;
		}
		else
		{
			CFixedVector3D fixed = cmpPosition->GetPosition();
			CVector3D centre = CVector3D(fixed.X.ToFloat(), fixed.Y.ToFloat(), fixed.Z.ToFloat());

			float cx, cy;
			g_Game->GetView()->GetCamera()->GetScreenCoordinates(centre, cx, cy);

			msg->offsetx = (int)(cx - x);
			msg->offsety = (int)(cy - y);
		}
	}
}


QUERYHANDLER(PickObjectsInRect)
{
	float x0, y0, x1, y1;
	msg->start->GetScreenSpace(x0, y0);
	msg->end->GetScreenSpace(x1, y1);

	// Since owner selections are meaningless in Atlas, use INVALID_PLAYER
	msg->ids = EntitySelection::PickEntitiesInRect(*g_Game->GetSimulation2(), *g_Game->GetView()->GetCamera(), x0, y0, x1, y1, INVALID_PLAYER, msg->selectActors);
}


QUERYHANDLER(PickSimilarObjects)
{
	CmpPtr<ICmpTemplateManager> cmpTemplateManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
	ENSURE(cmpTemplateManager);

	entity_id_t ent = msg->id;
	std::string templateName = cmpTemplateManager->GetCurrentTemplateName(ent);

	// If unit has ownership, only pick units from the same player
	player_id_t owner = INVALID_PLAYER;
	CmpPtr<ICmpOwnership> cmpOwnership(*g_Game->GetSimulation2(), ent);
	if (cmpOwnership)
		owner = cmpOwnership->GetOwner();

	msg->ids = EntitySelection::PickSimilarEntities(*g_Game->GetSimulation2(), *g_Game->GetView()->GetCamera(), templateName, owner, false, true, true, false);
}

MESSAGEHANDLER(ResetSelectionColor)
{
	UNUSED2(msg);

	for (entity_id_t ent : g_Selection)
	{
		CmpPtr<ICmpVisual> cmpVisual(*g_Game->GetSimulation2(), ent);
		if (cmpVisual)
			cmpVisual->SetShadingColor(fixed::FromDouble(1), fixed::FromDouble(1), fixed::FromDouble(1), fixed::FromDouble(1));
	}
}

BEGIN_COMMAND(MoveObjects)
{
	// Mapping from object to position
	std::map<entity_id_t, CVector3D> m_PosOld, m_PosNew;

	void Do()
	{
		std::vector<entity_id_t> ids = *msg->ids;

		// All selected objects move relative to a pivot object,
		//	so get its position and whether it's floating
		CVector3D pivotPos(0, 0, 0);
		bool pivotFloating = false;

		CmpPtr<ICmpPosition> cmpPositionPivot(*g_Game->GetSimulation2(), (entity_id_t)msg->pivot);
		if (cmpPositionPivot && cmpPositionPivot->IsInWorld())
		{
			pivotFloating = cmpPositionPivot->CanFloat();
			CFixedVector3D pivotFixed = cmpPositionPivot->GetPosition();
			pivotPos = CVector3D(pivotFixed.X.ToFloat(), pivotFixed.Y.ToFloat(), pivotFixed.Z.ToFloat());
		}

		// Calculate directional vector of movement for pivot object,
		//	we apply the same movement to all objects
		CVector3D targetPos = GetUnitPos(msg->pos, pivotFloating);
		CVector3D dir = targetPos - pivotPos;

		for (entity_id_t id : ids)
		{
			CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), id);
			if (!cmpPosition || !cmpPosition->IsInWorld())
			{
				// error
				m_PosOld[id] = m_PosNew[id] = CVector3D(0, 0, 0);
			}
			else
			{
				// Calculate this object's position
				CFixedVector3D posFixed = cmpPosition->GetPosition();
				CVector3D pos = CVector3D(posFixed.X.ToFloat(), posFixed.Y.ToFloat(), posFixed.Z.ToFloat());
				m_PosNew[id] = pos + dir;
				m_PosOld[id] = pos;
			}
		}

		SetPos(m_PosNew);
	}

	void SetPos(const std::map<entity_id_t, CVector3D>& map)
	{
		for (const std::pair<const entity_id_t, CVector3D>& p : map)
		{
			CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), p.first);
			if (!cmpPosition)
				return;

			// Set 2D position, ignoring height
			cmpPosition->JumpTo(entity_pos_t::FromFloat(p.second.X), entity_pos_t::FromFloat(p.second.Z));

			CheckObstructionAndUpdateVisual(p.first);
		}
	}

	void Redo()
	{
		SetPos(m_PosNew);
	}

	void Undo()
	{
		SetPos(m_PosOld);
	}

	void MergeIntoPrevious(cMoveObjects* prev)
	{
		// TODO: do something valid if prev selection != this selection
		ENSURE(*(prev->msg->ids) == *(msg->ids));
		prev->m_PosNew = m_PosNew;
	}
};
END_COMMAND(MoveObjects)

BEGIN_COMMAND(RotateObjectsFromCenterPoint)
{
	std::map<entity_id_t, CVector3D> m_PosOld, m_PosNew;
	std::map<entity_id_t, float> m_AngleOld, m_AngleNew;
	CVector3D m_CenterPoint;
	float m_AngleInitialRotation;

	void Do()
	{
		std::vector<entity_id_t> ids = *msg->ids;

		CVector3D minPos;
		CVector3D maxPos;

		bool first = true;

		// Compute min position and max position
		for (entity_id_t id : ids)
		{
			CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), id);
			if (!cmpPosition)
				continue;

			CVector3D pos = cmpPosition->GetPosition();

			m_PosOld[id] = cmpPosition->GetPosition();
			m_AngleOld[id] = cmpPosition->GetRotation().Y.ToFloat();

			if (first)
			{
				first = false;
				minPos = pos;
				maxPos = pos;
				m_CenterPoint.Y = pos.Y;
				continue;
			}

			if (pos.X < minPos.X)
				minPos.X = pos.X;

			if (pos.X > maxPos.X)
				maxPos.X = pos.X;

			if (pos.Z < minPos.Z)
				minPos.Z = pos.Z;

			if (pos.Z > maxPos.Z)
				maxPos.Z = pos.Z;
		}

		// Calculate objects center point
		m_CenterPoint.X = minPos.X + ((maxPos.X - minPos.X) * 0.5);
		m_CenterPoint.Z = minPos.Z + ((maxPos.Z - minPos.Z) * 0.5);

		CVector3D target = msg->target->GetWorldSpace(m_CenterPoint.Y);
		m_AngleInitialRotation = atan2(target.X-m_CenterPoint.X, target.Z-m_CenterPoint.Z);
	}

	void SetPos(const std::map<entity_id_t, CVector3D>& position, const std::map<entity_id_t, float>& angle)
	{
		for (const std::pair<const entity_id_t, CVector3D>& p : position)
		{
			CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), p.first);
			if (!cmpPosition)
				return;

			// Set 2D position, ignoring height
			cmpPosition->JumpTo(entity_pos_t::FromFloat(p.second.X), entity_pos_t::FromFloat(p.second.Z));

			if (msg->rotateObject)
				cmpPosition->SetYRotation(entity_angle_t::FromFloat(angle.at(p.first)));

		}

		for (const std::pair<const entity_id_t, CVector3D>& p : position)
			CheckObstructionAndUpdateVisual(p.first);
	}

	void Redo()
	{
		SetPos(m_PosNew, m_AngleNew);
	}

	void RecalculateRotation(Position newPoint)
	{
		std::vector<entity_id_t> ids = *msg->ids;

		CVector3D target = newPoint.GetWorldSpace(m_CenterPoint.Y);
		float newAngle = atan2(target.X-m_CenterPoint.X, target.Z-m_CenterPoint.Z);

		float globalAngle = m_AngleInitialRotation - newAngle;

		// Recalculate positions
		for (entity_id_t id : ids)
		{
			CVector3D pos = m_PosOld[id];
			float angle = atan2(pos.X - m_CenterPoint.X, pos.Z - m_CenterPoint.Z);
			float localAngle = angle + (globalAngle - angle);
			float xCos = cosf(localAngle);
			float xSin = sinf(localAngle);

			pos.X -= m_CenterPoint.X;
			pos.Z -= m_CenterPoint.Z;

			float newX = pos.X * xCos - pos.Z * xSin;
			float newZ = pos.X * xSin + pos.Z * xCos;

			pos.X = newX + m_CenterPoint.X;
			pos.Z = newZ + m_CenterPoint.Z;

			m_PosNew[id] = pos;

			m_AngleNew[id] = m_AngleOld[id] - globalAngle;
		}

		SetPos(m_PosNew, m_AngleNew);
	}

	void Undo()
	{
		SetPos(m_PosOld, m_AngleOld);
	}

	void MergeIntoPrevious(cRotateObjectsFromCenterPoint* prev)
	{
		// TODO: do something valid if prev unit != this unit
		ENSURE(*prev->msg->ids == *msg->ids);
		m_PosOld = prev->m_PosOld;
		m_AngleInitialRotation = prev->m_AngleInitialRotation;
		m_AngleOld = prev->m_AngleOld;
		m_CenterPoint = prev->m_CenterPoint;

		RecalculateRotation(msg->target);
	}
};
END_COMMAND(RotateObjectsFromCenterPoint)

BEGIN_COMMAND(RotateObject)
{
	std::map<entity_id_t, float> m_AngleOld, m_AngleNew;

	void Do()
	{
		std::vector<entity_id_t> ids = *msg->ids;

		for (entity_id_t id : ids)
		{
			CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), id);
			if (!cmpPosition)
				return;

			m_AngleOld[id] = cmpPosition->GetRotation().Y.ToFloat();

			CMatrix3D transform = cmpPosition->GetInterpolatedTransform(0.f);
			CVector3D pos = transform.GetTranslation();
			CVector3D target = msg->target->GetWorldSpace(pos.Y);
			m_AngleNew[id] = atan2(target.X-pos.X, target.Z-pos.Z);
		}

		SetAngle(m_AngleNew);
	}

	void SetAngle(const std::map<entity_id_t, float>& angles)
	{
		for (const std::pair<const entity_id_t, float>& p : angles)
		{
			CmpPtr<ICmpPosition> cmpPosition(*g_Game->GetSimulation2(), p.first);
			if (!cmpPosition)
				return;

			cmpPosition->SetYRotation(entity_angle_t::FromFloat(p.second));
		}
	}

	void Redo()
	{
		SetAngle(m_AngleNew);
	}

	void Undo()
	{
		SetAngle(m_AngleOld);
	}

	void MergeIntoPrevious(cRotateObject* prev)
	{
		// TODO: do something valid if prev unit != this unit
		ENSURE(*prev->msg->ids == *msg->ids);
		prev->m_AngleNew = m_AngleNew;
	}
};
END_COMMAND(RotateObject)


BEGIN_COMMAND(DeleteObjects)
{
	// Saved copy of the important aspects of a unit, to allow undo
	struct OldObject
	{
		entity_id_t entityID;
		CStr templateName;
		player_id_t owner;
		CFixedVector3D pos;
		CFixedVector3D rot;
		u32 actorSeed;
	};

	std::vector<OldObject> oldObjects;

	cDeleteObjects()
	{
	}

	void Do()
	{
		Redo();
	}

	void Redo()
	{
		CSimulation2& sim = *g_Game->GetSimulation2();
		CmpPtr<ICmpTemplateManager> cmpTemplateManager(sim, SYSTEM_ENTITY);
		ENSURE(cmpTemplateManager);

		std::vector<entity_id_t> ids = *msg->ids;
		for (size_t i = 0; i < ids.size(); ++i)
		{
			OldObject obj;

			obj.entityID = (entity_id_t)ids[i];
			obj.templateName = cmpTemplateManager->GetCurrentTemplateName(obj.entityID);

			CmpPtr<ICmpOwnership> cmpOwnership(sim, obj.entityID);
			if (cmpOwnership)
				obj.owner = cmpOwnership->GetOwner();

			CmpPtr<ICmpPosition> cmpPosition(sim, obj.entityID);
			if (cmpPosition)
			{
				obj.pos = cmpPosition->GetPosition();
				obj.rot = cmpPosition->GetRotation();
			}

			CmpPtr<ICmpVisual> cmpVisual(sim, obj.entityID);
			if (cmpVisual)
				obj.actorSeed = cmpVisual->GetActorSeed();

			oldObjects.push_back(obj);
			g_Game->GetSimulation2()->DestroyEntity(obj.entityID);
		}
		g_Game->GetSimulation2()->FlushDestroyedEntities();
	}

	void Undo()
	{
		CSimulation2& sim = *g_Game->GetSimulation2();

		for (size_t i = 0; i < oldObjects.size(); ++i)
		{
			entity_id_t ent = sim.AddEntity(oldObjects[i].templateName.FromUTF8(), oldObjects[i].entityID);
			if (ent == INVALID_ENTITY)
			{
				LOGERROR("Failed to load entity template '%s'", oldObjects[i].templateName.c_str());
			}
			else
			{
				CmpPtr<ICmpPosition> cmpPosition(sim, oldObjects[i].entityID);
				if (cmpPosition)
				{
					cmpPosition->JumpTo(oldObjects[i].pos.X, oldObjects[i].pos.Z);
					cmpPosition->SetXZRotation(oldObjects[i].rot.X, oldObjects[i].rot.Z);
					cmpPosition->SetYRotation(oldObjects[i].rot.Y);
				}

				CmpPtr<ICmpOwnership> cmpOwnership(sim, oldObjects[i].entityID);
				if (cmpOwnership)
					cmpOwnership->SetOwner(oldObjects[i].owner);

				CmpPtr<ICmpVisual> cmpVisual(sim, oldObjects[i].entityID);
				if (cmpVisual)
					cmpVisual->SetActorSeed(oldObjects[i].actorSeed);
			}
		}

		oldObjects.clear();
	}
};
END_COMMAND(DeleteObjects)

QUERYHANDLER(GetPlayerObjects)
{
	std::vector<entity_id_t> ids;
	player_id_t playerID = msg->player;

	const CSimulation2::InterfaceListUnordered& cmps = g_Game->GetSimulation2()->GetEntitiesWithInterfaceUnordered(IID_Ownership);
	for (CSimulation2::InterfaceListUnordered::const_iterator eit = cmps.begin(); eit != cmps.end(); ++eit)
	{
		if (static_cast<ICmpOwnership*>(eit->second)->GetOwner() == playerID)
		{
			ids.push_back(eit->first);
		}
	}

	msg->ids = ids;
}

MESSAGEHANDLER(SetBandbox)
{
	AtlasView::GetView_Game()->SetBandbox(msg->show, (float)msg->sx0, (float)msg->sy0, (float)msg->sx1, (float)msg->sy1);
}

QUERYHANDLER(GetSelectedObjectsTemplateNames)
{
	std::vector<entity_id_t> ids = *msg->ids;
	std::vector<std::string> names;

	CmpPtr<ICmpTemplateManager> cmpTemplateManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
	ENSURE(cmpTemplateManager);

	for (size_t i = 0; i < ids.size(); ++i)
	{
		entity_id_t id = (entity_id_t)ids[i];
		std::string templateName = cmpTemplateManager->GetCurrentTemplateName(id);
		names.push_back(templateName);
	}

	std::sort(names.begin(), names.end());
	msg->names = names;
}

} // namespace AtlasMessage