package randomx

import (
	"git.gammaspectra.live/P2Pool/consensus/v3/types"
)

type Hasher interface {
	Hash(key []byte, input []byte) (types.Hash, error)
	OptionFlags(flags ...Flag) error
	OptionNumberOfCachedStates(n int) error
	Close()
}

func SeedHeights(height uint64) (seedHeight, nextHeight uint64) {
	return SeedHeight(height), SeedHeight(height + SeedHashEpochLag)
}

func SeedHeight(height uint64) uint64 {
	if height <= SeedHashEpochBlocks+SeedHashEpochLag {
		return 0
	}

	return (height - SeedHashEpochLag - 1) & (^uint64(SeedHashEpochBlocks - 1))
}

type Flag int

const (
	FlagLargePages Flag = 1 << iota
	FlagFullMemory
	FlagSecure
)

const (
	SeedHashEpochLag    = 64
	SeedHashEpochBlocks = 2048
)