package market

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/big"
	"github.com/filecoin-project/go-state-types/cbor"
	"github.com/ipfs/go-cid"
	cbg "github.com/whyrusleeping/cbor-gen"

	market0 "github.com/filecoin-project/specs-actors/actors/builtin/market"
{{range .versions}}
	builtin{{.}} "github.com/filecoin-project/specs-actors{{import .}}actors/builtin"
{{end}}

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

func init() {
{{range .versions}}
	builtin.RegisterActorState(builtin{{.}}.StorageMarketActorCodeID, func(store adt.Store, root cid.Cid) (cbor.Marshaler, error) {
		return load{{.}}(store, root)
	})
{{end}}}

var (
	Address = builtin{{.latestVersion}}.StorageMarketActorAddr
	Methods = builtin{{.latestVersion}}.MethodsMarket
)

func Load(store adt.Store, act *types.Actor) (State, error) {
	switch act.Code {
{{range .versions}}
	case builtin{{.}}.StorageMarketActorCodeID:
		return load{{.}}(store, act.Head)
{{end}}
	}
	return nil, xerrors.Errorf("unknown actor code %s", act.Code)
}

func MakeState(store adt.Store, av actors.Version) (State, error) {
	switch av {
{{range .versions}}
	case actors.Version{{.}}:
		return make{{.}}(store)
{{end}}
}
	return nil, xerrors.Errorf("unknown actor version %d", av)
}

func GetActorCodeID(av actors.Version) (cid.Cid, error) {
	switch av {
{{range .versions}}
	case actors.Version{{.}}:
		return builtin{{.}}.StorageMarketActorCodeID, nil
{{end}}
	}

	return cid.Undef, xerrors.Errorf("unknown actor version %d", av)
}

type State interface {
	cbor.Marshaler
	BalancesChanged(State) (bool, error)
	EscrowTable() (BalanceTable, error)
	LockedTable() (BalanceTable, error)
	TotalLocked() (abi.TokenAmount, error)
	StatesChanged(State) (bool, error)
	States() (DealStates, error)
	ProposalsChanged(State) (bool, error)
	Proposals() (DealProposals, error)
	VerifyDealsForActivation(
		minerAddr address.Address, deals []abi.DealID, currEpoch, sectorExpiry abi.ChainEpoch,
	) (weight, verifiedWeight abi.DealWeight, err error)
	NextID() (abi.DealID, error)
	GetState() interface{}
}

type BalanceTable interface {
	ForEach(cb func(address.Address, abi.TokenAmount) error) error
	Get(key address.Address) (abi.TokenAmount, error)
}

type DealStates interface {
	ForEach(cb func(id abi.DealID, ds DealState) error) error
	Get(id abi.DealID) (*DealState, bool, error)

	array() adt.Array
	decode(*cbg.Deferred) (*DealState, error)
}

type DealProposals interface {
	ForEach(cb func(id abi.DealID, dp DealProposal) error) error
	Get(id abi.DealID) (*DealProposal, bool, error)

	array() adt.Array
	decode(*cbg.Deferred) (*DealProposal, error)
}

type PublishStorageDealsParams = market0.PublishStorageDealsParams
type PublishStorageDealsReturn = market0.PublishStorageDealsReturn
type VerifyDealsForActivationParams = market0.VerifyDealsForActivationParams
type WithdrawBalanceParams = market0.WithdrawBalanceParams

type ClientDealProposal = market0.ClientDealProposal

type DealState struct {
	SectorStartEpoch abi.ChainEpoch // -1 if not yet included in proven sector
	LastUpdatedEpoch abi.ChainEpoch // -1 if deal state never updated
	SlashEpoch       abi.ChainEpoch // -1 if deal never slashed
}

type DealProposal struct {
	PieceCID			 cid.Cid
	PieceSize			 abi.PaddedPieceSize
	VerifiedDeal		 bool
	Client				 address.Address
	Provider			 address.Address
	Label				 string
	StartEpoch			 abi.ChainEpoch
	EndEpoch			 abi.ChainEpoch
	StoragePricePerEpoch abi.TokenAmount
	ProviderCollateral	 abi.TokenAmount
	ClientCollateral	 abi.TokenAmount
}

type DealStateChanges struct {
	Added	 []DealIDState
	Modified []DealStateChange
	Removed	 []DealIDState
}

type DealIDState struct {
	ID	 abi.DealID
	Deal DealState
}

// DealStateChange is a change in deal state from -> to
type DealStateChange struct {
	ID	 abi.DealID
	From *DealState
	To	 *DealState
}

type DealProposalChanges struct {
	Added	[]ProposalIDState
	Removed []ProposalIDState
}

type ProposalIDState struct {
	ID		 abi.DealID
	Proposal DealProposal
}

func EmptyDealState() *DealState {
	return &DealState{
		SectorStartEpoch: -1,
		SlashEpoch:		  -1,
		LastUpdatedEpoch: -1,
	}
}

// returns the earned fees and pending fees for a given deal
func (deal DealProposal) GetDealFees(height abi.ChainEpoch) (abi.TokenAmount, abi.TokenAmount) {
	   tf := big.Mul(deal.StoragePricePerEpoch, big.NewInt(int64(deal.EndEpoch-deal.StartEpoch)))

	   ef := big.Mul(deal.StoragePricePerEpoch, big.NewInt(int64(height-deal.StartEpoch)))
	   if ef.LessThan(big.Zero()) {
			   ef = big.Zero()
	   }

	   if ef.GreaterThan(tf) {
			   ef = tf
	   }

	   return ef, big.Sub(tf, ef)
}