#ifndef PKE_MEMORY_TYPE_DEFS_HPP
#define PKE_MEMORY_TYPE_DEFS_HPP

#include <cstdint>

using PkeHandleBucketIndex_T = uint32_t;
using PkeHandleItemIndex_T = uint32_t;

const uint8_t PKE_HANDLE_VALIDATION_VALID = 0;
const uint8_t PKE_HANDLE_VALIDATION_BUCKET_INDEX_TOO_HIGH = 1;
const uint8_t PKE_HANDLE_VALIDATION_ITEM_INDEX_TOO_HIGH = 2;
const uint8_t PKE_HANDLE_VALIDATION_VALUE_MAX = 3;

struct PkeHandle {
	union {
		struct {
			PkeHandleBucketIndex_T bucketIndex;
			PkeHandleItemIndex_T itemIndex;
		};
		uint64_t hash = 0xFFFFFFFFFFFFFFFF;
	};
};
constexpr PkeHandle PkeHandle_MAX = PkeHandle{};

constexpr bool operator==(const PkeHandle &a, const PkeHandle &b) {
	return a.hash == b.hash;
}

constexpr uint8_t ValidateHandle(PkeHandle handle, PkeHandle bucketHandle, uint64_t maxItems) {
	if (handle == PkeHandle_MAX)
		return PKE_HANDLE_VALIDATION_VALUE_MAX;
	if (handle.bucketIndex > bucketHandle.bucketIndex)
		return PKE_HANDLE_VALIDATION_BUCKET_INDEX_TOO_HIGH;
	if (handle.itemIndex > maxItems)
		return PKE_HANDLE_VALIDATION_ITEM_INDEX_TOO_HIGH;
	if (handle.bucketIndex == bucketHandle.bucketIndex && handle.itemIndex > bucketHandle.itemIndex)
		return PKE_HANDLE_VALIDATION_ITEM_INDEX_TOO_HIGH;
	return PKE_HANDLE_VALIDATION_VALID;
}

struct MemBucket;

#endif /* PKE_MEMORY_TYPE_DEFS_HPP */