committee

type CandidateOrder struct {
	*effective.SlotOrder
	StakePerKey *big.Int
	Validator   common.Address
}

type CandidatesForEPoS struct {
	Orders                             map[common.Address]effective.SlotOrder
	OpenSlotCountForExternalValidators int
}

type ChainReader interface {
	// ReadShardState retrieves sharding state given the epoch number.
	// This api reads the shard state cached or saved on the chaindb.
	// Thus, only should be used to read the shard state of the current chain.
	ReadShardState(epoch *big.Int) (*shard.State, error)
	// GetHeader retrieves a block header from the database by hash and number.
	GetHeaderByHash(common.Hash) *block.Header
	// Config retrieves the blockchain's chain configuration.
	Config() *params.ChainConfig
	// CurrentHeader retrieves the current header from the local chain.
	CurrentHeader() *block.Header
}

type CompletedEPoSRound struct {
	MedianStake         numeric.Dec              `json:"epos-median-stake"`
	MaximumExternalSlot int                      `json:"max-external-slots"`
	AuctionWinners      []effective.SlotPurchase `json:"epos-slot-winners"`
	AuctionCandidates   []*CandidateOrder        `json:"epos-slot-candidates"`
}

type DataProvider interface {
	StakingCandidatesReader
	ChainReader
}

type Reader interface {
	ValidatorListProvider
}

type StakingCandidatesReader interface {
	CurrentBlock() *types.Block
	ReadValidatorInformation(addr common.Address) (*staking.ValidatorWrapper, error)
	ReadValidatorSnapshot(addr common.Address) (*staking.ValidatorSnapshot, error)
	ValidatorCandidates() []common.Address
}

type ValidatorListProvider interface {
	Compute(
		epoch *big.Int, reader DataProvider,
	) (*shard.State, error)
	ReadFromDB(epoch *big.Int, reader DataProvider) (*shard.State, error)
}