// Copyright 2024 The Erigon Authors
// This file is part of Erigon.
//
// Erigon is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Erigon is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Erigon. If not, see <http://www.gnu.org/licenses/>.

package health

import (
	"context"
	"errors"
	"fmt"
)

var (
	errNotEnoughPeers = errors.New("not enough peers")
)

func checkMinPeers(ctx context.Context, minPeerCount uint, api NetAPI) error {
	if api == nil {
		return errors.New("no connection to the Erigon server or `net` namespace isn't enabled")
	}

	peerCount, err := api.PeerCount(ctx)
	if err != nil {
		return err
	}

	if uint64(peerCount) < uint64(minPeerCount) {
		return fmt.Errorf("%w: %d (minimum %d)", errNotEnoughPeers, peerCount, minPeerCount)
	}

	return nil
}
