package power

import (
	"github.com/filecoin-project/go-address"
	"github.com/ipfs/go-cid"
	"golang.org/x/xerrors"

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

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

	builtin0 "github.com/filecoin-project/specs-actors/actors/builtin"
	builtin1 "github.com/filecoin-project/specs-actors/v2/actors/builtin"
)

func init() {
	builtin.RegisterActorState(builtin0.StoragePowerActorCodeID, func(store adt.Store, root cid.Cid) (cbor.Marshaler, error) {
		return load0(store, root)
	})
	builtin.RegisterActorState(builtin1.StoragePowerActorCodeID, func(store adt.Store, root cid.Cid) (cbor.Marshaler, error) {
		return load1(store, root)
	})
}

var Address = builtin0.StoragePowerActorAddr

func Load(store adt.Store, act *types.Actor) (st State, err error) {
	switch act.Code {
	case builtin0.StoragePowerActorCodeID:
		return load0(store, act.Head)
	case builtin1.StoragePowerActorCodeID:
		return load1(store, act.Head)
	}
	return nil, xerrors.Errorf("unknown actor code %s", act.Code)
}

type State interface {
	cbor.Marshaler

	TotalLocked() (abi.TokenAmount, error)
	TotalPower() (Claim, error)
	TotalCommitted() (Claim, error)
	TotalPowerSmoothed() (builtin.FilterEstimate, error)

	// MinerCounts returns the number of miners. Participating is the number
	// with power above the minimum miner threshold.
	MinerCounts() (participating, total uint64, err error)
	MinerPower(address.Address) (Claim, bool, error)
	MinerNominalPowerMeetsConsensusMinimum(address.Address) (bool, error)
	ListAllMiners() ([]address.Address, error)
}

type Claim struct {
	// Sum of raw byte power for a miner's sectors.
	RawBytePower abi.StoragePower

	// Sum of quality adjusted power for a miner's sectors.
	QualityAdjPower abi.StoragePower
}