package stores

import (
	"context"
	"os"

	"github.com/filecoin-project/go-state-types/abi"
	"github.com/filecoin-project/lotus/extern/sector-storage/partialfile"

	"github.com/filecoin-project/specs-storage/storage"

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

// PartialFileHandler helps mock out the partial file functionality during testing.
type partialFileHandler interface {
	// OpenPartialFile opens and returns a partial file at the given path and also verifies it has the given
	// size
	OpenPartialFile(maxPieceSize abi.PaddedPieceSize, path string) (*partialfile.PartialFile, error)

	// HasAllocated returns true if the given partial file has an unsealed piece starting at the given offset with the given size.
	// returns false otherwise.
	HasAllocated(pf *partialfile.PartialFile, offset storiface.UnpaddedByteIndex, size abi.UnpaddedPieceSize) (bool, error)

	// Reader returns a file from which we can read the unsealed piece in the partial file.
	Reader(pf *partialfile.PartialFile, offset storiface.PaddedByteIndex, size abi.PaddedPieceSize) (*os.File, error)

	// Close closes the partial file
	Close(pf *partialfile.PartialFile) error
}

type Store interface {
	AcquireSector(ctx context.Context, s storage.SectorRef, existing storiface.SectorFileType, allocate storiface.SectorFileType, sealing storiface.PathType, op storiface.AcquireMode) (paths storiface.SectorPaths, stores storiface.SectorPaths, err error)
	Remove(ctx context.Context, s abi.SectorID, types storiface.SectorFileType, force bool) error

	// like remove, but doesn't remove the primary sector copy, nor the last
	// non-primary copy if there no primary copies
	RemoveCopies(ctx context.Context, s abi.SectorID, types storiface.SectorFileType) error

	// move sectors into storage
	MoveStorage(ctx context.Context, s storage.SectorRef, types storiface.SectorFileType) error

	FsStat(ctx context.Context, id ID) (fsutil.FsStat, error)

	Reserve(ctx context.Context, sid storage.SectorRef, ft storiface.SectorFileType, storageIDs storiface.SectorPaths, overheadTab map[storiface.SectorFileType]int) (func(), error)
}