/*
===========================================================================

IceTech GPL Source Code
Copyright (C) 2026 Justin Marshall

===========================================================================
*/

#include "precompiled.h"
#pragma hdrstop

#include "../Game_local.h"
#include "RecastNavMesh.h"

idRecastNavMesh::idRecastNavMesh( void ) {
	handle = RECAST_NAV_HANDLE_INVALID;
	memset( &syntheticReach, 0, sizeof( syntheticReach ) );
	if ( RecastNavigationManager ) {
		handle = RecastNavigationManager->Alloc();
	}
}

idRecastNavMesh::~idRecastNavMesh( void ) {
	if ( RecastNavigationManager && handle != RECAST_NAV_HANDLE_INVALID ) {
		RecastNavigationManager->Free( handle );
		handle = RECAST_NAV_HANDLE_INVALID;
	}
}

bool idRecastNavMesh::HasManager( void ) const {
	return RecastNavigationManager && handle != RECAST_NAV_HANDLE_INVALID;
}

void idRecastNavMesh::Shutdown( void ) {
	if ( HasManager() ) {
		RecastNavigationManager->Free( handle );
		handle = RecastNavigationManager->Alloc();
	}
	name.Clear();
	memset( &syntheticReach, 0, sizeof( syntheticReach ) );
}

bool idRecastNavMesh::Load( const idStr &mapName, const idStr &fileName, unsigned int mapFileCRC ) {
	if ( !HasManager() ) {
		return false;
	}
	if ( !RecastNavigationManager->Load( handle, mapName, fileName, mapFileCRC ) ) {
		name.Clear();
		return false;
	}
	name = fileName;
	return true;
}

bool idRecastNavMesh::IsLoaded( void ) const {
	return HasManager() && RecastNavigationManager->IsLoaded( handle );
}

int idRecastNavMesh::NumPolys( void ) const {
	return HasManager() ? RecastNavigationManager->NumPolys( handle ) : 0;
}

const idAASSettings *idRecastNavMesh::GetSettings( void ) const {
	return HasManager() ? RecastNavigationManager->GetSettings( handle ) : NULL;
}

idStr idRecastNavMesh::NavFileNameForMapName( const idStr &mapName ) {
	idStr navName = mapName;
	navName += ".navmesh";
	return navName;
}

bool idRecastNavMesh::BuildMapFile( const idStr &mapName, const idStr &aasType ) {
	return RecastNavigationManager && RecastNavigationManager->BuildMapFile( mapName.c_str(), aasType.c_str() );
}

void idRecastNavMesh::Stats( void ) const {
	if ( HasManager() ) {
		RecastNavigationManager->Stats( handle );
	}
}

void idRecastNavMesh::DebugDraw( int drawMode ) const {
	if ( HasManager() ) {
		RecastNavigationManager->DebugDraw( handle, gameRenderWorld, drawMode, gameLocal.msec );
	}
}

int idRecastNavMesh::PointAreaNum( const idVec3 &origin ) const {
	return HasManager() ? RecastNavigationManager->PointAreaNum( handle, origin ) : 0;
}

int idRecastNavMesh::PointReachableAreaNum( const idVec3 &origin, const idBounds &searchBounds, const int areaFlags ) const {
	return HasManager() ? RecastNavigationManager->PointReachableAreaNum( handle, origin, searchBounds, areaFlags ) : 0;
}

int idRecastNavMesh::BoundsReachableAreaNum( const idBounds &bounds, const int areaFlags ) const {
	return HasManager() ? RecastNavigationManager->BoundsReachableAreaNum( handle, bounds, areaFlags ) : 0;
}

void idRecastNavMesh::PushPointIntoAreaNum( int areaNum, idVec3 &origin ) const {
	if ( HasManager() ) {
		RecastNavigationManager->PushPointIntoAreaNum( handle, areaNum, origin );
	}
}

idVec3 idRecastNavMesh::AreaCenter( int areaNum ) const {
	return HasManager() ? RecastNavigationManager->AreaCenter( handle, areaNum ) : vec3_origin;
}

int idRecastNavMesh::AreaFlags( int areaNum ) const {
	return HasManager() ? RecastNavigationManager->AreaFlags( handle, areaNum ) : 0;
}

int idRecastNavMesh::AreaTravelFlags( int areaNum ) const {
	return HasManager() ? RecastNavigationManager->AreaTravelFlags( handle, areaNum ) : TFL_INVALID;
}

bool idRecastNavMesh::Trace( aasTrace_t &trace, const idVec3 &start, const idVec3 &end ) const {
	return HasManager() && RecastNavigationManager->Trace( handle, trace, start, end );
}

bool idRecastNavMesh::SetAreaState( const idBounds &bounds, const int areaContents, bool disabled ) {
	return HasManager() && RecastNavigationManager->SetAreaState( handle, bounds, areaContents, disabled );
}

aasHandle_t idRecastNavMesh::AddObstacle( const idBounds &bounds ) {
	return HasManager() ? RecastNavigationManager->AddObstacle( handle, bounds ) : -1;
}

void idRecastNavMesh::RemoveObstacle( const aasHandle_t obstacleHandle ) {
	if ( HasManager() ) {
		RecastNavigationManager->RemoveObstacle( handle, obstacleHandle );
	}
}

void idRecastNavMesh::RemoveAllObstacles( void ) {
	if ( HasManager() ) {
		RecastNavigationManager->RemoveAllObstacles( handle );
	}
}

int idRecastNavMesh::TravelTimeToGoalArea( int areaNum, const idVec3 &origin, int goalAreaNum, int travelFlags ) const {
	return HasManager() ? RecastNavigationManager->TravelTimeToGoalArea( handle, areaNum, origin, goalAreaNum, travelFlags ) : 0;
}

bool idRecastNavMesh::RouteToGoalArea( int areaNum, const idVec3 origin, int goalAreaNum, int travelFlags, int &travelTime, idReachability **reach ) const {
	recastPath_t route;
	if ( !HasManager() || !RecastNavigationManager->RouteToGoalArea( handle, areaNum, origin, goalAreaNum, travelFlags, route ) ) {
		travelTime = 0;
		*reach = NULL;
		return false;
	}

	travelTime = route.travelTime;
	memset( &syntheticReach, 0, sizeof( syntheticReach ) );
	syntheticReach.travelType = TFL_WALK;
	syntheticReach.fromAreaNum = areaNum;
	syntheticReach.toAreaNum = route.moveAreaNum;
	syntheticReach.start = route.moveGoal;
	syntheticReach.end = route.moveGoal;
	syntheticReach.travelTime = travelTime;
	*reach = &syntheticReach;
	return true;
}

bool idRecastNavMesh::PathToGoal( aasPath_t &path, int areaNum, const idVec3 &origin, int goalAreaNum, const idVec3 &goalOrigin, int travelFlags ) const {
	recastPath_t recastPath;
	if ( !HasManager() || !RecastNavigationManager->PathToGoal( handle, recastPath, areaNum, origin, goalAreaNum, goalOrigin, travelFlags ) ) {
		return false;
	}

	path.type = PATHTYPE_WALK;
	path.moveGoal = recastPath.moveGoal;
	path.moveAreaNum = recastPath.moveAreaNum;
	path.secondaryGoal = recastPath.secondaryGoal;
	path.reachability = NULL;
	return true;
}

bool idRecastNavMesh::PathValid( int areaNum, const idVec3 &origin, int goalAreaNum, const idVec3 &goalOrigin, int travelFlags, idVec3 &endPos, int &endAreaNum ) const {
	return HasManager() && RecastNavigationManager->PathValid( handle, areaNum, origin, goalAreaNum, goalOrigin, travelFlags, endPos, endAreaNum );
}

bool idRecastNavMesh::FindNearestGoal( const idNAV *owner, aasGoal_t &goal, int areaNum, const idVec3 origin, const idVec3 &target, int travelFlags, aasObstacle_t *queryObstacles, int numObstacles, idNAVCallback &callback ) const {
	int areas[MAX_RECAST_PATH_AREAS];
	int numAreas = 0;
	const int targetArea = PointAreaNum( target );
	if ( targetArea <= 0 || !HasManager() || !RecastNavigationManager->PathAreaList( handle, areaNum, origin, targetArea, target, travelFlags, areas, numAreas, MAX_RECAST_PATH_AREAS ) ) {
		return false;
	}

	for ( int i = numAreas - 1; i >= 0; i-- ) {
		const int candidateArea = areas[i];
		if ( !callback.AreaIsGoal( owner, candidateArea ) ) {
			continue;
		}

		const idVec3 candidateOrigin = AreaCenter( candidateArea );
		bool blocked = false;
		for ( int j = 0; j < numObstacles; j++ ) {
			if ( queryObstacles[j].expAbsBounds.ContainsPoint( candidateOrigin ) ) {
				blocked = true;
				break;
			}
		}
		if ( !blocked ) {
			goal.areaNum = candidateArea;
			goal.origin = candidateOrigin;
			return true;
		}
	}
	return false;
}

void idRecastNavMesh::ShowPath( const idVec3 &origin, int goalAreaNum, const idVec3 &goalOrigin ) const {
	aasPath_t path;
	const int areaNum = PointAreaNum( origin );
	if ( PathToGoal( path, areaNum, origin, goalAreaNum, goalOrigin, TFL_WALK ) ) {
		gameRenderWorld->DebugLine( colorGreen, origin, path.moveGoal, gameLocal.msec );
		gameRenderWorld->DebugArrow( colorYellow, path.moveGoal, goalOrigin, 4.0f, gameLocal.msec );
	}
}

void idRecastNavMesh::ShowArea( const idVec3 &origin ) const {
	const int areaNum = PointAreaNum( origin );
	if ( areaNum <= 0 ) {
		return;
	}
	const idVec3 center = AreaCenter( areaNum );
	gameRenderWorld->DebugBounds( colorCyan, idBounds( idVec3( -8.0f, -8.0f, -4.0f ), idVec3( 8.0f, 8.0f, 4.0f ) ), center, gameLocal.msec );
}