package core

import (
	"context"
)

type EntryStore interface {
	Append(ctx context.Context, entry Entry) error
	Get(ctx context.Context, entryID EntryID) (Entry, error)
	GetBySeq(ctx context.Context, ledgerID LedgerID, seq uint64) (Entry, error)
	Delete(ctx context.Context, entryID EntryID) error

	Head(ctx context.Context, ledgerID LedgerID) (EntryID, error)
	HeadSeq(context.Context, LedgerID) (uint64, error)
	Tail(ctx context.Context, ledgerID LedgerID) (EntryID, error)
	Iterator(ctx context.Context, ledgerLedgerID, startSeq uint64) (EntryIterator, error)
}

type EntryIterator interface {
	Next() bool
	Entry() Entry
}

type PayloadStore interface {
	Put(ctx context.Context, payload []byte) (PayloadID, error)
	Get(ctx context.Context, payloadID PayloadID) ([]byte, error)
	Delete(ctx context.Context, payloadID PayloadID) error
}