#pragma once

#ifdef _WINDOWS64

#include <string>
#include <Windows.h>
#include "..\..\Minecraft.World\GameUUID.h"

// Player identity is always assigned by the auth manager (Mojang/offline).
// No local persistence (uuid.dat) is used — the auth handshake is the source of truth.

namespace Win64Uuid
{
	inline GameUUID DeriveUuidForPad(GameUUID baseUuid, int iPad)
	{
		if (iPad == 0)
			return baseUuid;

		// Deterministic per-pad UUID derived from the base.
		uint64_t mixHi = baseUuid.hi ^ (0x9E3779B97F4A7C15ULL * (uint64_t)(iPad + 1));
		uint64_t mixLo = baseUuid.lo ^ (0xBF58476D1CE4E5B9ULL * (uint64_t)(iPad + 1));

		mixHi = (mixHi ^ (mixHi >> 30)) * 0xBF58476D1CE4E5B9ULL;
		mixHi = (mixHi ^ (mixHi >> 27)) * 0x94D049BB133111EBULL;
		mixHi = mixHi ^ (mixHi >> 31);

		mixLo = (mixLo ^ (mixLo >> 30)) * 0xBF58476D1CE4E5B9ULL;
		mixLo = (mixLo ^ (mixLo >> 27)) * 0x94D049BB133111EBULL;
		mixLo = mixLo ^ (mixLo >> 31);

		// Mark as UUID v4 variant 1
		mixHi = (mixHi & ~0x000000000000F000ULL) | 0x0000000000004000ULL;
		mixLo = (mixLo & ~0xC000000000000000ULL) | 0x8000000000000000ULL;

		GameUUID derived;
		derived.hi = mixHi;
		derived.lo = mixLo;
		return derived;
	}
}

#endif