package multisig

import (
    "fmt"
	"bytes"
	"encoding/binary"

	actorstypes "github.com/filecoin-project/go-state-types/actors"

	"github.com/filecoin-project/go-address"
	"github.com/filecoin-project/go-state-types/abi"
	"github.com/ipfs/go-cid"
	cbg "github.com/whyrusleeping/cbor-gen"
	"golang.org/x/xerrors"

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

{{if (le .v 7)}}
    {{if (ge .v 3)}}
        builtin{{.v}} "github.com/filecoin-project/specs-actors{{.import}}actors/builtin"
    {{end}}
        msig{{.v}} "github.com/filecoin-project/specs-actors{{.import}}actors/builtin/multisig"
        adt{{.v}} "github.com/filecoin-project/specs-actors{{.import}}actors/util/adt"
{{else}}
	msig{{.v}} "github.com/filecoin-project/go-state-types/builtin{{.import}}multisig"
	adt{{.v}} "github.com/filecoin-project/go-state-types/builtin{{.import}}util/adt"
	builtin{{.v}} "github.com/filecoin-project/go-state-types/builtin"
{{end}}
)

var _ State = (*state{{.v}})(nil)

func load{{.v}}(store adt.Store, root cid.Cid) (State, error) {
	out := state{{.v}}{store: store}
	err := store.Get(store.Context(), root, &out)
	if err != nil {
		return nil, err
	}
	return &out, nil
}

func make{{.v}}(store adt.Store, signers []address.Address, threshold uint64, startEpoch abi.ChainEpoch, unlockDuration abi.ChainEpoch, initialBalance abi.TokenAmount) (State, error) {
	out := state{{.v}}{store: store}
	out.State = msig{{.v}}.State{}
	out.State.Signers = signers
	out.State.NumApprovalsThreshold = threshold
	out.State.StartEpoch = startEpoch
	out.State.UnlockDuration = unlockDuration
	out.State.InitialBalance = initialBalance
	{{if (le .v 2)}}
		em, err := adt{{.v}}.MakeEmptyMap(store).Root()
		if err != nil {
			return nil, err
		}

		out.State.PendingTxns = em
	{{else}}
		em, err := adt{{.v}}.StoreEmptyMap(store, builtin{{.v}}.DefaultHamtBitwidth)
		if err != nil {
			return nil, err
		}

		out.State.PendingTxns = em
	{{end}}
	return &out, nil
}

type state{{.v}} struct {
	msig{{.v}}.State
	store adt.Store
}

func (s *state{{.v}}) LockedBalance(currEpoch abi.ChainEpoch) (abi.TokenAmount, error) {
	return s.State.AmountLocked(currEpoch - s.State.StartEpoch), nil
}

func (s *state{{.v}}) StartEpoch() (abi.ChainEpoch, error) {
	return s.State.StartEpoch, nil
}

func (s *state{{.v}}) UnlockDuration() (abi.ChainEpoch, error) {
	return s.State.UnlockDuration, nil
}

func (s *state{{.v}}) InitialBalance() (abi.TokenAmount, error) {
	return s.State.InitialBalance, nil
}

func (s *state{{.v}}) Threshold() (uint64, error) {
	return s.State.NumApprovalsThreshold, nil
}

func (s *state{{.v}}) Signers() ([]address.Address, error) {
	return s.State.Signers, nil
}

func (s *state{{.v}}) ForEachPendingTxn(cb func(id int64, txn Transaction) error) error {
	arr, err := adt{{.v}}.AsMap(s.store, s.State.PendingTxns{{if (ge .v 3)}}, builtin{{.v}}.DefaultHamtBitwidth{{end}})
	if err != nil {
		return err
	}
	var out msig{{.v}}.Transaction
	return arr.ForEach(&out, func(key string) error {
		txid, n := binary.Varint([]byte(key))
		if n <= 0 {
			return xerrors.Errorf("invalid pending transaction key: %v", key)
		}
		return cb(txid, (Transaction)(out)) //nolint:unconvert
	})
}

func (s *state{{.v}}) PendingTxnChanged(other State) (bool, error) {
	other{{.v}}, ok := other.(*state{{.v}})
	if !ok {
		// treat an upgrade as a change, always
		return true, nil
	}
	return !s.State.PendingTxns.Equals(other{{.v}}.PendingTxns), nil
}

func (s *state{{.v}}) transactions() (adt.Map, error) {
	return adt{{.v}}.AsMap(s.store, s.PendingTxns{{if (ge .v 3)}}, builtin{{.v}}.DefaultHamtBitwidth{{end}})
}

func (s *state{{.v}}) decodeTransaction(val *cbg.Deferred) (Transaction, error) {
	var tx msig{{.v}}.Transaction
	if err := tx.UnmarshalCBOR(bytes.NewReader(val.Raw)); err != nil {
		return Transaction{}, err
	}
	return Transaction(tx), nil
}

func (s *state{{.v}}) GetState() interface{} {
	return &s.State
}

func (s *state{{.v}}) ActorKey() string {
    return actors.MultisigKey
}

func (s *state{{.v}}) ActorVersion() actorstypes.Version {
    return actorstypes.Version{{.v}}
}

func (s *state{{.v}}) Code() cid.Cid {
	code, ok := actors.GetActorCodeID(s.ActorVersion(), s.ActorKey())
	if !ok {
		panic(fmt.Errorf("didn't find actor %v code id for actor version %d", s.ActorKey(), s.ActorVersion()))
	}

	return code
}