package core

import (
	"context"
	"io"
)

type EntryStore interface {
	Append(ctx context.Context, entry Entry) (EntryID, error)

	Redact(ctx context.Context, entryID EntryID) error

	Get(ctx context.Context, entryID EntryID) (Entry, error)

	ScanForwards(ctx context.Context, entryID EntryID) ([]EntryID, error)
	ScanBackwards(ctx context.Context, entryID EntryID) ([]EntryID, error)

	Head(ctx context.Context, ledgerID LedgerID) (EntryID, error)
	IsEmpty(ctx context.Context, ledgerID LedgerID) bool
}

type PayloadStore interface {
	Put(ctx context.Context, reader io.Reader) (PayloadID, error)
	Delete(ctx context.Context, payloadID PayloadID) error
}