// Fill out your copyright notice in the Description page of Project Settings.


#include "LevelLocation.h"
#include "EngineUtils.h"
#include "Util.h"

#define LogError(Msg) Util::log_error(TEXT("LevelLocation"), Msg)

LevelLocation::LevelLocation()
{
}

LevelLocation::~LevelLocation()
{
}

bool LevelLocation::is_initialized() const
{
	return initialized;
}

/**
 * Initialize this class with a list of locations derived from the current world.
 */
void LevelLocation::initialize(UWorld *world, const UClass *marker_class) 
{
	initialized = true;

	/*
	 * Find all the markers in the world.
	 */
	for (TActorIterator<AActor> iterator(world); iterator; ++iterator)
	{
		AActor* actor = *iterator;
		if (actor)
		{
			UClass* actor_class = actor->GetClass();

			if (actor_class == marker_class)
			{
				locations.Add(actor->GetActorLocation());
			}
		}
	}
	
	if (locations.Num() == 0)
	{
		LogError("No markers");
	}

	/*
	 * Initialize random stream.
	 */
	random.Initialize(FMath::Rand());
}

/**
 * Get world location of randomly selected mark.
 * 
 * @return World location vector of mark.
 */
FVector LevelLocation::get_random_mark() const
{
	if (locations.Num() == 0)
	{
		LogError("No markers");
		return FVector();
	}

	const int index = random.RandRange(0, locations.Num() - 1);
	return locations[index];
}