package utils

import (
	"github.com/XinFinOrg/XDPoSChain/common/hexutil"
	"github.com/XinFinOrg/XDPoSChain/core/types"
)

// XDPoS delegated-proof-of-stake protocol constants.
const (
	BlockSignersCacheLimit = 9000
	EpochLength            = uint64(900)     // Default number of blocks after which to checkpoint and reset the pending votes
	ExtraVanity            = 32              // Fixed number of extra-data prefix bytes reserved for signer vanity
	ExtraSeal              = 65              // Fixed number of extra-data suffix bytes reserved for signer seal
	InMemoryEpochs         = 5 * EpochLength // Number of mapping from block to epoch switch infos to keep in memory
	InMemoryRound2Epochs   = 65536           // Number of mapping of epoch switch blocks for quickly locating epoch switch block. One epoch ~ 0.5hours, so 65536 epochs ~ 3.7 years. And it uses ~ 10MB memory.
	InMemorySnapshots      = 128             // Number of recent vote snapshots to keep in memory
	M2ByteLength           = 4
	PeriodicJobPeriod      = 60
	PoolHygieneRound       = 10
)

var (
	NonceAuthVote = hexutil.MustDecode("0xffffffffffffffff") // Magic nonce number to vote on adding a new signer
	NonceDropVote = hexutil.MustDecode("0x0000000000000000") // Magic nonce number to vote on removing a signer.
	UncleHash     = types.CalcUncleHash(nil)                 // Always Keccak256(RLP([])) as uncles are meaningless outside of PoW.
)