#pragma once

#include "CoreMinimal.h"
#include "Misc/AutomationTest.h"
#include "Engine/World.h"

/**
 * Shared by every Tests/<System>Tests.cpp. Test names all start with "Descent." so `Automation RunTests Descent`
 * selects exactly these; a system uses "Descent.<System>.<Name>". Tests are headless (-nullrhi): pure logic only.
 * Anything that needs the renderer is a scenario (Debug/Scenarios_<Topic>.cpp).
 *
 * EditorContext covers UnrealEditor-Cmd (what Tools/run_tests.ps1 uses); ClientContext covers a packaged game.
 */
#define DESCENT_TEST_FLAGS (EAutomationTestFlags::EditorContext | EAutomationTestFlags::ClientContext | EAutomationTestFlags::ProductFilter)

/**
 * A throw-away game world, created and destroyed by the test. World subsystems of The Descent exist in it (they
 * support Game worlds), so a test gets the real UDescentSimSubsystem and friends and drives them by hand
 * (Step, FastForward, ...) without a map, a renderer or a tick.
 */
class FDescentTestWorld
{
public:
	FDescentTestWorld() : World(UWorld::CreateWorld(EWorldType::Game, /*bInformEngineOfWorld*/ false)) {}
	~FDescentTestWorld()
	{
		if (World)
		{
			World->DestroyWorld(/*bInformEngineOfWorld*/ false);
		}
	}
	FDescentTestWorld(const FDescentTestWorld&) = delete;
	FDescentTestWorld& operator=(const FDescentTestWorld&) = delete;

	UWorld* Get() const { return World; }
	template <typename TSubsystem>
	TSubsystem* Sub() const { return World ? World->GetSubsystem<TSubsystem>() : nullptr; }

private:
	UWorld* World = nullptr;
};