package policy

import (
	"sort"

	"github.com/filecoin-project/go-state-types/big"
	"golang.org/x/xerrors"

	"github.com/filecoin-project/go-state-types/abi"
	"github.com/filecoin-project/go-state-types/network"
	"github.com/filecoin-project/lotus/chain/actors"

	{{range .versions}}
	{{if (ge . 2)}} builtin{{.}} "github.com/filecoin-project/specs-actors{{import .}}actors/builtin" {{end}}
	market{{.}} "github.com/filecoin-project/specs-actors{{import .}}actors/builtin/market"
	miner{{.}} "github.com/filecoin-project/specs-actors{{import .}}actors/builtin/miner"
	verifreg{{.}} "github.com/filecoin-project/specs-actors{{import .}}actors/builtin/verifreg"
	{{if (eq . 0)}} power{{.}} "github.com/filecoin-project/specs-actors{{import .}}actors/builtin/power" {{end}}
	{{end}}

	paych{{.latestVersion}} "github.com/filecoin-project/specs-actors{{import .latestVersion}}actors/builtin/paych"
)

const (
	ChainFinality                  = miner{{.latestVersion}}.ChainFinality
	SealRandomnessLookback         = ChainFinality
	PaychSettleDelay               = paych{{.latestVersion}}.SettleDelay
	MaxPreCommitRandomnessLookback = builtin{{.latestVersion}}.EpochsInDay + SealRandomnessLookback
)

// SetSupportedProofTypes sets supported proof types, across all actor versions.
// This should only be used for testing.
func SetSupportedProofTypes(types ...abi.RegisteredSealProof) {
	{{range .versions}}
		{{if (eq . 0)}}
			miner{{.}}.SupportedProofTypes = make(map[abi.RegisteredSealProof]struct{}, len(types))
		{{else if (le . 4)}}
			miner{{.}}.PreCommitSealProofTypesV0 = make(map[abi.RegisteredSealProof]struct{}, len(types))
			miner{{.}}.PreCommitSealProofTypesV7 = make(map[abi.RegisteredSealProof]struct{}, len(types)*2)
			miner{{.}}.PreCommitSealProofTypesV8 = make(map[abi.RegisteredSealProof]struct{}, len(types))
		{{else}}
			miner{{.}}.PreCommitSealProofTypesV8 = make(map[abi.RegisteredSealProof]struct{}, len(types))
		{{end}}
	{{end}}

	AddSupportedProofTypes(types...)
}

// AddSupportedProofTypes sets supported proof types, across all actor versions.
// This should only be used for testing.
func AddSupportedProofTypes(types ...abi.RegisteredSealProof) {
	for _, t := range types {
		if t >= abi.RegisteredSealProof_StackedDrg2KiBV1_1 {
			panic("must specify v1 proof types only")
		}
		// Set for all miner versions.

		{{range .versions}}
            {{if (eq . 0)}}
        	    miner{{.}}.SupportedProofTypes[t] = struct{}{}
            {{else if (le . 4)}}
                miner{{.}}.PreCommitSealProofTypesV0[t] = struct{}{}
                miner{{.}}.PreCommitSealProofTypesV7[t] = struct{}{}
                miner{{.}}.PreCommitSealProofTypesV7[t+abi.RegisteredSealProof_StackedDrg2KiBV1_1] = struct{}{}
                miner{{.}}.PreCommitSealProofTypesV8[t+abi.RegisteredSealProof_StackedDrg2KiBV1_1] = struct{}{}
            {{else if (eq . 5)}}
                miner{{.}}.PreCommitSealProofTypesV8[t+abi.RegisteredSealProof_StackedDrg2KiBV1_1] = struct{}{}
                wpp, err := t.RegisteredWindowPoStProof()
                if err != nil {
                    // Fine to panic, this is a test-only method
                    panic(err)
                }

                miner{{.}}.WindowPoStProofTypes[wpp] = struct{}{}
            {{else}}
                miner{{.}}.PreCommitSealProofTypesV8[t+abi.RegisteredSealProof_StackedDrg2KiBV1_1] = struct{}{}
                wpp, err = t.RegisteredWindowPoStProof()
                if err != nil {
                    // Fine to panic, this is a test-only method
                    panic(err)
                }

                miner{{.}}.WindowPoStProofTypes[wpp] = struct{}{}
            {{end}}
        {{end}}
	}
}

// SetPreCommitChallengeDelay sets the pre-commit challenge delay across all
// actors versions. Use for testing.
func SetPreCommitChallengeDelay(delay abi.ChainEpoch) {
	// Set for all miner versions.
	{{range .versions}}
		miner{{.}}.PreCommitChallengeDelay = delay
	{{end}}
}

// TODO: this function shouldn't really exist. Instead, the API should expose the precommit delay.
func GetPreCommitChallengeDelay() abi.ChainEpoch {
	return miner{{.latestVersion}}.PreCommitChallengeDelay
}

// SetConsensusMinerMinPower sets the minimum power of an individual miner must
// meet for leader election, across all actor versions. This should only be used
// for testing.
func SetConsensusMinerMinPower(p abi.StoragePower) {
	{{range .versions}}
		{{if (eq . 0)}}
			power{{.}}.ConsensusMinerMinPower = p
		{{else if (eq . 2)}}
			for _, policy := range builtin{{.}}.SealProofPolicies {
				policy.ConsensusMinerMinPower = p
			}
		{{else}}
			for _, policy := range builtin{{.}}.PoStProofPolicies {
				policy.ConsensusMinerMinPower = p
			}
		{{end}}
	{{end}}
}

// SetMinVerifiedDealSize sets the minimum size of a verified deal. This should
// only be used for testing.
func SetMinVerifiedDealSize(size abi.StoragePower) {
	{{range .versions}}
		verifreg{{.}}.MinVerifiedDealSize = size
	{{end}}
}

func GetMaxProveCommitDuration(ver actors.Version, t abi.RegisteredSealProof) (abi.ChainEpoch, error) {
	switch ver {
		{{range .versions}}
			case actors.Version{{.}}:
				{{if (eq . 0)}}
					return miner{{.}}.MaxSealDuration[t], nil
				{{else}}
					return miner{{.}}.MaxProveCommitDuration[t], nil
				{{end}}
		{{end}}
	default:
		return 0, xerrors.Errorf("unsupported actors version")
	}
}

// SetProviderCollateralSupplyTarget sets the percentage of normalized circulating
// supply that must be covered by provider collateral in a deal. This should
// only be used for testing.
func SetProviderCollateralSupplyTarget(num, denom big.Int) {
{{range .versions}}
	{{if (ge . 2)}}
	market{{.}}.ProviderCollateralSupplyTarget = builtin{{.}}.BigFrac{
		Numerator:   num,
		Denominator: denom,
	}
	{{end}}
{{end}}
}

func DealProviderCollateralBounds(
	size abi.PaddedPieceSize, verified bool,
	rawBytePower, qaPower, baselinePower abi.StoragePower,
	circulatingFil abi.TokenAmount, nwVer network.Version,
) (min, max abi.TokenAmount, err error) {
	v, err := actors.VersionForNetwork(nwVer)
	if err != nil {
		return big.Zero(), big.Zero(), err
	}
	switch v {
		{{range .versions}}
			case actors.Version{{.}}:
				{{if (eq . 0)}}
					min, max := market{{.}}.DealProviderCollateralBounds(size, verified, rawBytePower, qaPower, baselinePower, circulatingFil, nwVer)
					return min, max, nil
				{{else}}
					min, max := market{{.}}.DealProviderCollateralBounds(size, verified, rawBytePower, qaPower, baselinePower, circulatingFil)
					return min, max, nil
				{{end}}
		{{end}}
	default:
		return big.Zero(), big.Zero(), xerrors.Errorf("unsupported actors version")
	}
}

func DealDurationBounds(pieceSize abi.PaddedPieceSize) (min, max abi.ChainEpoch) {
	return market{{.latestVersion}}.DealDurationBounds(pieceSize)
}

// Sets the challenge window and scales the proving period to match (such that
// there are always 48 challenge windows in a proving period).
func SetWPoStChallengeWindow(period abi.ChainEpoch) {
	{{range .versions}}
		miner{{.}}.WPoStChallengeWindow = period
		miner{{.}}.WPoStProvingPeriod = period * abi.ChainEpoch(miner{{.}}.WPoStPeriodDeadlines)
		{{if (ge . 3)}}
			// by default, this is 2x finality which is 30 periods.
			// scale it if we're scaling the challenge period.
			miner{{.}}.WPoStDisputeWindow = period * 30
		{{end}}
	{{end}}
}

func GetWinningPoStSectorSetLookback(nwVer network.Version) abi.ChainEpoch {
	if nwVer <= network.Version3 {
		return 10
	}

	// NOTE: if this ever changes, adjust it in a (*Miner).mineOne() logline as well
	return ChainFinality
}

func GetMaxSectorExpirationExtension() abi.ChainEpoch {
	return miner{{.latestVersion}}.MaxSectorExpirationExtension
}

func GetMinSectorExpiration() abi.ChainEpoch {
	return miner{{.latestVersion}}.MinSectorExpiration
}

func GetMaxPoStPartitions(nv network.Version, p abi.RegisteredPoStProof) (int, error) {
	sectorsPerPart, err := builtin{{.latestVersion}}.PoStProofWindowPoStPartitionSectors(p)
	if err != nil {
		return 0, err
	}
	maxSectors, err := GetAddressedSectorsMax(nv)
	if err != nil {
		return 0, err
	}
	return int(uint64(maxSectors) / sectorsPerPart), nil
}

func GetDefaultSectorSize() abi.SectorSize {
	// supported sector sizes are the same across versions.
	szs := make([]abi.SectorSize, 0, len(miner{{.latestVersion}}.PreCommitSealProofTypesV8))
	for spt := range miner{{.latestVersion}}.PreCommitSealProofTypesV8 {
		ss, err := spt.SectorSize()
		if err != nil {
			panic(err)
		}

		szs = append(szs, ss)
	}

	sort.Slice(szs, func(i, j int) bool {
		return szs[i] < szs[j]
	})

	return szs[0]
}

func GetDefaultAggregationProof() abi.RegisteredAggregationProof {
	return abi.RegisteredAggregationProof_SnarkPackV1
}

func GetSectorMaxLifetime(proof abi.RegisteredSealProof, nwVer network.Version) abi.ChainEpoch {
	if nwVer <= network.Version10 {
		return builtin4.SealProofPoliciesV0[proof].SectorMaxLifetime
	}

	return builtin{{.latestVersion}}.SealProofPoliciesV11[proof].SectorMaxLifetime
}

func GetAddressedSectorsMax(nwVer network.Version) (int, error) {
	v, err := actors.VersionForNetwork(nwVer)
	if err != nil {
		return 0, err
	}
	switch v {
		{{range .versions}}
			case actors.Version{{.}}:
				return miner{{.}}.AddressedSectorsMax, nil
		{{end}}
	default:
		return 0, xerrors.Errorf("unsupported network version")
	}
}

func GetDeclarationsMax(nwVer network.Version) (int, error) {
	v, err := actors.VersionForNetwork(nwVer)
	if err != nil {
		return 0, err
	}
	switch v {
		{{range .versions}}
		case actors.Version{{.}}:
			{{if (eq . 0)}}
				// TODO: Should we instead error here since the concept doesn't exist yet?
				return miner{{.}}.AddressedPartitionsMax, nil
			{{else}}
				return miner{{.}}.DeclarationsMax, nil
			{{end}}
		{{end}}
	default:
		return 0, xerrors.Errorf("unsupported network version")
	}
}

func AggregateNetworkFee(nwVer network.Version, aggregateSize int, baseFee abi.TokenAmount) (abi.TokenAmount, error) {
   v, err := actors.VersionForNetwork(nwVer)
	if err != nil {
		return big.Zero(), err
	}
	switch v {
	    {{range .versions}}
	    case actors.Version{{.}}:
            {{if (le . 4)}}
                return big.Zero(), nil
            {{else}}
                return miner{{.}}.AggregateNetworkFee(aggregateSize, baseFee), nil
            {{end}}
        {{end}}
	default:
		return big.Zero(), xerrors.Errorf("unsupported network version")
	}
}