package multisig

import (
	"golang.org/x/xerrors"

	"github.com/filecoin-project/go-address"
	"github.com/filecoin-project/go-state-types/abi"
	"github.com/filecoin-project/go-state-types/cbor"

	builtin0 "github.com/filecoin-project/specs-actors/actors/builtin"
	msig0 "github.com/filecoin-project/specs-actors/actors/builtin/multisig"

	"github.com/filecoin-project/lotus/chain/actors/adt"
	"github.com/filecoin-project/lotus/chain/types"
)

func Load(store adt.Store, act *types.Actor) (State, error) {
	switch act.Code {
	case builtin0.MultisigActorCodeID:
		out := state0{store: store}
		err := store.Get(store.Context(), act.Head, &out)
		if err != nil {
			return nil, err
		}
		return &out, nil
	}
	return nil, xerrors.Errorf("unknown actor code %s", act.Code)
}

type State interface {
	cbor.Marshaler

	LockedBalance(epoch abi.ChainEpoch) (abi.TokenAmount, error)
	StartEpoch() (abi.ChainEpoch, error)
	UnlockDuration() (abi.ChainEpoch, error)
	InitialBalance() (abi.TokenAmount, error)
	Threshold() (uint64, error)
	Signers() ([]address.Address, error)

	ForEachPendingTxn(func(id int64, txn Transaction) error) error
}

type Transaction = msig0.Transaction