// 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 statechange

import (
	"github.com/erigontech/erigon/cl/abstract"
	"github.com/erigontech/erigon/cl/monitor"
	"github.com/erigontech/erigon/cl/phase1/core/state"
)

// ProcessSyncCommitteeUpdate implements processing for the sync committee update. unfortunately there is no easy way to test it.
func ProcessSyncCommitteeUpdate(s abstract.BeaconState) error {
	defer monitor.ObserveElaspedTime(monitor.ProcessSyncCommitteeUpdateTime).End()
	if (state.Epoch(s)+1)%s.BeaconConfig().EpochsPerSyncCommitteePeriod != 0 {
		return nil
	}
	// Set new current sync committee.
	s.SetCurrentSyncCommittee(s.NextSyncCommittee())
	// Compute next new sync committee
	committee, err := s.ComputeNextSyncCommittee()
	if err != nil {
		return err
	}
	s.SetNextSyncCommittee(committee)
	return nil
}
