package mempool

import (
	"context"

	"cosmossdk.io/core/transaction"

	sdk "github.com/cosmos/cosmos-sdk/types"
)

var (
	_ Mempool[sdk.Tx]         = (*NoOpMempool[sdk.Tx])(nil) // verify interface at compile time
	_ Mempool[transaction.Tx] = (*NoOpMempool[transaction.Tx])(nil)
)

// NoOpMempool defines a no-op mempool. Transactions are completely discarded and
// ignored when BaseApp interacts with the mempool.
//
// Note: When this mempool is used, it assumed that an application will rely
// on CometBFT's transaction ordering defined in `RequestPrepareProposal`, which
// is FIFO-ordered by default.
type NoOpMempool[T transaction.Tx] struct{}

func (NoOpMempool[T]) Insert(context.Context, T) error             { return nil }
func (NoOpMempool[T]) Select(context.Context, []T) Iterator[T]     { return nil }
func (NoOpMempool[T]) SelectBy(context.Context, []T, func(T) bool) {}
func (NoOpMempool[T]) CountTx() int                                { return 0 }
func (NoOpMempool[T]) Remove(T) error                              { return nil }