#include "World/WorldMapDefinition.h"

// Direct-initialised from an explicit FName: copy-initialising from a string literal would need two
// user-defined conversions (TCHAR* -> FName -> FPrimaryAssetType), which the language does not allow.
const FPrimaryAssetType UWorldMapDefinition::AssetType(FName("WorldMap"));

const FWorldMapLayer* UWorldMapDefinition::FindLayer(FName Id) const
{
	return Layers.FindByPredicate([Id](const FWorldMapLayer& Layer) { return Layer.Id == Id; });
}

const FWorldMapLayer* UWorldMapDefinition::ResolveDefaultLayer() const
{
	if (const FWorldMapLayer* Named = FindLayer(DefaultLayer))
	{
		return Named;
	}
	return Layers.Num() > 0 ? &Layers[0] : nullptr;
}

FName UWorldMapDefinition::NextLayerId(FName Id) const
{
	if (Layers.Num() == 0)
	{
		return NAME_None;
	}
	const int32 Index = Layers.IndexOfByPredicate([Id](const FWorldMapLayer& Layer) { return Layer.Id == Id; });
	// An unknown id lands on the first layer rather than on nothing, so a stale name in a saved setting
	// recovers on the next press instead of leaving the map blank.
	return Layers[Index == INDEX_NONE ? 0 : (Index + 1) % Layers.Num()].Id;
}

TArray<FName> UWorldMapDefinition::GetLayerIds() const
{
	TArray<FName> Ids;
	Ids.Reserve(Layers.Num());
	for (const FWorldMapLayer& Layer : Layers)
	{
		Ids.Add(Layer.Id);
	}
	return Ids;
}