/* Copyright (C) 2025 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 "JSInterface_Simulation.h"

#include "graphics/GameView.h"
#include "lib/debug.h"
#include "lib/os_path.h"
#include "lib/path.h"
#include "maths/Fixed.h"
#include "maths/FixedVector2D.h"
#include "maths/FixedVector3D.h"
#include "ps/ConfigDB.h"
#include "ps/Game.h"
#include "ps/GameSetup/Config.h"
#include "ps/Pyrogenesis.h"
#include "scriptinterface/FunctionWrapper.h"
#include "scriptinterface/Object.h"
#include "scriptinterface/ScriptRequest.h"
#include "scriptinterface/StructuredClone.h"
#include "simulation2/Simulation2.h"
#include "simulation2/components/ICmpAIManager.h"
#include "simulation2/components/ICmpCommandQueue.h"
#include "simulation2/components/ICmpGuiInterface.h"
#include "simulation2/components/ICmpObstruction.h"
#include "simulation2/components/ICmpPosition.h"
#include "simulation2/components/ICmpSelectable.h"
#include "simulation2/helpers/Geometry.h"
#include "simulation2/helpers/Position.h"
#include "simulation2/helpers/Selection.h"
#include "simulation2/system/Component.h"
#include "simulation2/system/Entity.h"

#include <algorithm>
#include <array>
#include <cstddef>
#include <fstream>
#include <js/RootingAPI.h>
#include <js/TypeDecls.h>
#include <js/Value.h>
#include <string>
#include <vector>

class ScriptInterface;

namespace JSI_Simulation
{
JS::Value GuiInterfaceCall(const ScriptInterface& scriptInterface, const std::wstring& name, JS::HandleValue data)
{
	if (!g_Game)
		return JS::UndefinedValue();

	CSimulation2* sim = g_Game->GetSimulation2();
	ENSURE(sim);

	CmpPtr<ICmpGuiInterface> cmpGuiInterface(*sim, SYSTEM_ENTITY);
	if (!cmpGuiInterface)
		return JS::UndefinedValue();

	ScriptRequest rqSim(sim->GetScriptInterface());
	JS::RootedValue arg(rqSim.cx, Script::CloneValueFromOtherCompartment(sim->GetScriptInterface(), scriptInterface, data));
	JS::RootedValue ret(rqSim.cx);
	cmpGuiInterface->ScriptCall(g_Game->GetViewedPlayerID(), name, arg, &ret);

	return Script::CloneValueFromOtherCompartment(scriptInterface, sim->GetScriptInterface(), ret);
}

void PostNetworkCommand(const ScriptInterface& scriptInterface, JS::HandleValue cmd)
{
	if (!g_Game)
		return;

	CSimulation2* sim = g_Game->GetSimulation2();
	ENSURE(sim);

	CmpPtr<ICmpCommandQueue> cmpCommandQueue(*sim, SYSTEM_ENTITY);
	if (!cmpCommandQueue)
		return;

	ScriptRequest rqSim(sim->GetScriptInterface());
	JS::RootedValue cmd2(rqSim.cx, Script::CloneValueFromOtherCompartment(sim->GetScriptInterface(), scriptInterface, cmd));

	cmpCommandQueue->PostNetworkCommand(cmd2);
}

void DumpSimState()
{
	OsPath path = psLogDir()/"sim_dump.txt";
	std::ofstream file (OsString(path), std::ofstream::out | std::ofstream::trunc);
	g_Game->GetSimulation2()->DumpDebugState(file);
}

entity_id_t PickEntityAtPoint(int x, int y)
{
	return EntitySelection::PickEntityAtPoint(*g_Game->GetSimulation2(), *g_Game->GetView()->GetCamera(), x, y, g_Game->GetViewedPlayerID(), false);
}

std::vector<entity_id_t> PickPlayerEntitiesInRect(int x0, int y0, int x1, int y1, int player)
{
	return EntitySelection::PickEntitiesInRect(*g_Game->GetSimulation2(), *g_Game->GetView()->GetCamera(), x0, y0, x1, y1, player, false);
}

std::vector<entity_id_t> PickPlayerEntitiesOnScreen(int player)
{
	return EntitySelection::PickEntitiesInRect(*g_Game->GetSimulation2(), *g_Game->GetView()->GetCamera(), 0, 0, g_xres, g_yres, player, false);
}

std::vector<entity_id_t> PickNonGaiaEntitiesOnScreen()
{
	return EntitySelection::PickNonGaiaEntitiesInRect(*g_Game->GetSimulation2(), *g_Game->GetView()->GetCamera(), 0, 0, g_xres, g_yres, false);
}

std::vector<entity_id_t> GetEntitiesWithStaticObstructionOnScreen()
{
	struct StaticObstructionFilter
	{
		bool operator()(IComponent* cmp)
		{
			ICmpObstruction* cmpObstruction = static_cast<ICmpObstruction*>(cmp);
			return cmpObstruction->GetObstructionType() == ICmpObstruction::STATIC;
		}
	};
	return EntitySelection::GetEntitiesWithComponentInRect<StaticObstructionFilter>(*g_Game->GetSimulation2(), IID_Obstruction, *g_Game->GetView()->GetCamera(), 0, 0, g_xres, g_yres);
}

JS::Value GetEdgesOfStaticObstructionsOnScreenNearTo(const ScriptInterface& scriptInterface, entity_pos_t x, entity_pos_t z)
{
	if (!g_Game)
		return JS::UndefinedValue();

	CSimulation2* sim = g_Game->GetSimulation2();
	ENSURE(sim);

	ScriptRequest rq(scriptInterface);
	JS::RootedValue edgeList(rq.cx);
	Script::CreateArray(rq, &edgeList);
	int edgeListIndex = 0;

	const float distanceThreshold{g_ConfigDB.Get("gui.session.snaptoedgesdistancethreshold", 10.0f)};
	CFixedVector2D entityPos(x, z);

	std::vector<entity_id_t> entities = GetEntitiesWithStaticObstructionOnScreen();
	for (entity_id_t entity : entities)
	{
		CmpPtr<ICmpObstruction> cmpObstruction(sim->GetSimContext(), entity);
		if (!cmpObstruction)
			continue;

		CmpPtr<ICmpPosition> cmpPosition(sim->GetSimContext(), entity);
		if (!cmpPosition || !cmpPosition->IsInWorld())
			continue;

		CFixedVector2D halfSize = cmpObstruction->GetStaticSize() / 2;
		if (halfSize.X.IsZero() || halfSize.Y.IsZero() || std::max(halfSize.X, halfSize.Y) <= fixed::FromInt(2))
			continue;

		std::array<CFixedVector2D, 4> corners = {
			CFixedVector2D(-halfSize.X, -halfSize.Y),
			CFixedVector2D(-halfSize.X, halfSize.Y),
			halfSize,
			CFixedVector2D(halfSize.X, -halfSize.Y)
		};
		const fixed angle = cmpPosition->GetRotation().Y;
		for (CFixedVector2D& corner : corners)
			corner = corner.Rotate(angle) + cmpPosition->GetPosition2D();

		for (size_t i = 0; i < corners.size(); ++i)
		{
			JS::RootedValue edge(rq.cx);
			const CFixedVector2D& corner = corners[i];
			const CFixedVector2D& nextCorner = corners[(i + 1) % corners.size()];

			const fixed distanceToEdge =
				Geometry::DistanceToSegment(entityPos, corner, nextCorner);
			if (distanceToEdge.ToFloat() > distanceThreshold)
				continue;

			CFixedVector2D normal = -(nextCorner - corner).Perpendicular();
			normal.Normalize();
			Script::CreateObject(
				rq,
				&edge,
				"begin", corner,
				"end", nextCorner,
				"angle", angle,
				"normal", normal,
				"order", "cw");

			Script::SetPropertyInt(rq, edgeList, edgeListIndex++, edge);
		}
	}
	return edgeList;
}

std::vector<entity_id_t> PickSimilarPlayerEntities(const std::string& templateName, bool includeOffScreen, bool matchRank, bool allowFoundations)
{
	return EntitySelection::PickSimilarEntities(*g_Game->GetSimulation2(), *g_Game->GetView()->GetCamera(), templateName, g_Game->GetViewedPlayerID(), includeOffScreen, matchRank, false, allowFoundations);
}

JS::Value GetAIs(const ScriptInterface& scriptInterface)
{
	return ICmpAIManager::GetAIs(scriptInterface);
}

void SetBoundingBoxDebugOverlay(bool enabled)
{
	ICmpSelectable::ms_EnableDebugOverlays = enabled;
}

void RegisterScriptFunctions(const ScriptRequest& rq)
{
	ScriptFunction::Register<&GuiInterfaceCall>(rq, "GuiInterfaceCall");
	ScriptFunction::Register<&PostNetworkCommand>(rq, "PostNetworkCommand");
	ScriptFunction::Register<&DumpSimState>(rq, "DumpSimState");
	ScriptFunction::Register<&GetAIs>(rq, "GetAIs");
	ScriptFunction::Register<&PickEntityAtPoint>(rq, "PickEntityAtPoint");
	ScriptFunction::Register<&PickPlayerEntitiesInRect>(rq, "PickPlayerEntitiesInRect");
	ScriptFunction::Register<&PickPlayerEntitiesOnScreen>(rq, "PickPlayerEntitiesOnScreen");
	ScriptFunction::Register<&PickNonGaiaEntitiesOnScreen>(rq, "PickNonGaiaEntitiesOnScreen");
	ScriptFunction::Register<&GetEntitiesWithStaticObstructionOnScreen>(rq, "GetEntitiesWithStaticObstructionOnScreen");
	ScriptFunction::Register<&GetEdgesOfStaticObstructionsOnScreenNearTo>(rq, "GetEdgesOfStaticObstructionsOnScreenNearTo");
	ScriptFunction::Register<&PickSimilarPlayerEntities>(rq, "PickSimilarPlayerEntities");
	ScriptFunction::Register<&SetBoundingBoxDebugOverlay>(rq, "SetBoundingBoxDebugOverlay");
}
}
