package innerring

import (
	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
	"github.com/nspcc-dev/neofs-node/pkg/innerring/invoke"
)

// EpochCounter is a getter for a global epoch counter.
func (s *Server) EpochCounter() uint64 {
	return s.epochCounter.Load()
}

// SetEpochCounter is a setter for contract processors to update global
// epoch counter.
func (s *Server) SetEpochCounter(val uint64) {
	s.epochCounter.Store(val)
}

// IsActive is a getter for a global active flag state.
func (s *Server) IsActive() bool {
	return s.innerRingIndex.Load() >= 0
}

// Index is a getter for a global index of node in inner ring list. Negative
// index means that node is not in the inner ring list.
func (s *Server) Index() int32 {
	return s.innerRingIndex.Load()
}

func (s *Server) voteForSidechainValidator(validators []keys.PublicKey) error {
	index := s.Index()
	if index < 0 || index >= alphabetContractsN {
		s.log.Info("ignore validator vote: node not in alphabet range")

		return nil
	}

	if len(validators) == 0 {
		s.log.Info("ignore validator vote: empty validators list")

		return nil
	}

	// len(validators) can be less than 7, in this case we split votes by
	// using `mod` operations, e.g: with two validators:
	// - node[0] vote for validators[0],
	// - node[1] vote for validators[1],
	// - node[2] vote for validators[0], etc.
	// If there are more than 7 validators, this function will ignore the rest.
	candidate := validators[int(index)%len(validators)]

	return invoke.AlphabetVote(s.morphClient, s.contracts.alphabet[index], candidate)
}

// InitAndVoteForSidechainValidator is a public function to use outside of
// inner ring daemon execution. It initialize inner ring structure with data
// from blockchain and then calls vote method on corresponding alphabet contract.
func (s *Server) InitAndVoteForSidechainValidator(validators []keys.PublicKey) error {
	err := s.initConfigFromBlockchain()
	if err != nil {
		return err
	}

	return s.voteForSidechainValidator(validators)
}