package artifacts

import "os"

// Ref identifies a pipeline artifact and its local/remote coordinates.
type Ref struct {
	Kind         string
	Category     string
	SessionID    string
	RelativePath string
	AbsolutePath string
	RemoteKey    string
	Checksum     string
}

// Store is the local artifact/workdir abstraction used by orchestration code.
type Store interface {
	SessionPaths(sessionID string) SessionPaths
	EnsureLayout(sessionID string) (SessionPaths, error)
	CopyInput(sessionID, srcPath, destRelativePath string) (Ref, error)
	Exists(path string) (bool, error)
	ExistsRef(ref Ref) (bool, error)
	WriteFileAtomic(path string, data []byte, perm os.FileMode) error
	Checksum(path string) (string, error)
	AcquireSessionLock(sessionID string) (*LockHandle, error)
	ReleaseSessionLock(lock *LockHandle) error
}