//+build cgo

package ffiwrapper

import (
	"context"

	"go.opencensus.io/trace"
	"golang.org/x/xerrors"

	ffi "github.com/filecoin-project/filecoin-ffi"
	"github.com/filecoin-project/go-state-types/abi"
	proof2 "github.com/filecoin-project/specs-actors/v2/actors/runtime/proof"

	"github.com/filecoin-project/lotus/extern/sector-storage/storiface"
)

func (sb *Sealer) GenerateWinningPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof2.SectorInfo, randomness abi.PoStRandomness) ([]proof2.PoStProof, error) {
	randomness[31] &= 0x3f
	privsectors, skipped, done, err := sb.pubSectorToPriv(ctx, minerID, sectorInfo, nil, abi.RegisteredSealProof.RegisteredWinningPoStProof) // TODO: FAULTS?
	if err != nil {
		return nil, err
	}
	defer done()
	if len(skipped) > 0 {
		return nil, xerrors.Errorf("pubSectorToPriv skipped sectors: %+v", skipped)
	}

	return ffi.GenerateWinningPoSt(minerID, privsectors, randomness)
}

func (sb *Sealer) GenerateWindowPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof2.SectorInfo, randomness abi.PoStRandomness) ([]proof2.PoStProof, []abi.SectorID, error) {
	randomness[31] &= 0x3f
	privsectors, skipped, done, err := sb.pubSectorToPriv(ctx, minerID, sectorInfo, nil, abi.RegisteredSealProof.RegisteredWindowPoStProof)
	if err != nil {
		return nil, nil, xerrors.Errorf("gathering sector info: %w", err)
	}
	defer done()

	if len(skipped) > 0 {
		return nil, skipped, xerrors.Errorf("pubSectorToPriv skipped some sectors")
	}

	proof, faulty, err := ffi.GenerateWindowPoSt(minerID, privsectors, randomness)

	var faultyIDs []abi.SectorID
	for _, f := range faulty {
		faultyIDs = append(faultyIDs, abi.SectorID{
			Miner:  minerID,
			Number: f,
		})
	}

	return proof, faultyIDs, err
}

func (sb *Sealer) pubSectorToPriv(ctx context.Context, mid abi.ActorID, sectorInfo []proof2.SectorInfo, faults []abi.SectorNumber, rpt func(abi.RegisteredSealProof) (abi.RegisteredPoStProof, error)) (ffi.SortedPrivateSectorInfo, []abi.SectorID, func(), error) {
	fmap := map[abi.SectorNumber]struct{}{}
	for _, fault := range faults {
		fmap[fault] = struct{}{}
	}

	var doneFuncs []func()
	done := func() {
		for _, df := range doneFuncs {
			df()
		}
	}

	var skipped []abi.SectorID
	var out []ffi.PrivateSectorInfo
	for _, s := range sectorInfo {
		if _, faulty := fmap[s.SectorNumber]; faulty {
			continue
		}

		sid := abi.SectorID{Miner: mid, Number: s.SectorNumber}

		paths, d, err := sb.sectors.AcquireSector(ctx, sid, storiface.FTCache|storiface.FTSealed, 0, storiface.PathStorage)
		if err != nil {
			log.Warnw("failed to acquire sector, skipping", "sector", sid, "error", err)
			skipped = append(skipped, sid)
			continue
		}
		doneFuncs = append(doneFuncs, d)

		postProofType, err := rpt(s.SealProof)
		if err != nil {
			done()
			return ffi.SortedPrivateSectorInfo{}, nil, nil, xerrors.Errorf("acquiring registered PoSt proof from sector info %+v: %w", s, err)
		}

		out = append(out, ffi.PrivateSectorInfo{
			CacheDirPath:     paths.Cache,
			PoStProofType:    postProofType,
			SealedSectorPath: paths.Sealed,
			SectorInfo:       s,
		})
	}

	return ffi.NewSortedPrivateSectorInfo(out...), skipped, done, nil
}

var _ Verifier = ProofVerifier

type proofVerifier struct{}

var ProofVerifier = proofVerifier{}

func (proofVerifier) VerifySeal(info proof2.SealVerifyInfo) (bool, error) {
	return ffi.VerifySeal(info)
}

func (proofVerifier) VerifyWinningPoSt(ctx context.Context, info proof2.WinningPoStVerifyInfo) (bool, error) {
	info.Randomness[31] &= 0x3f
	_, span := trace.StartSpan(ctx, "VerifyWinningPoSt")
	defer span.End()

	return ffi.VerifyWinningPoSt(info)
}

func (proofVerifier) VerifyWindowPoSt(ctx context.Context, info proof2.WindowPoStVerifyInfo) (bool, error) {
	info.Randomness[31] &= 0x3f
	_, span := trace.StartSpan(ctx, "VerifyWindowPoSt")
	defer span.End()

	return ffi.VerifyWindowPoSt(info)
}

func (proofVerifier) GenerateWinningPoStSectorChallenge(ctx context.Context, proofType abi.RegisteredPoStProof, minerID abi.ActorID, randomness abi.PoStRandomness, eligibleSectorCount uint64) ([]uint64, error) {
	randomness[31] &= 0x3f
	return ffi.GenerateWinningPoStSectorChallenge(proofType, minerID, randomness, eligibleSectorCount)
}