// vfs/vfs.go
package vfs

import "io"

// VFS is the interface that wraps the basic methods of a virtual file system.
type VFS interface {
	// Name returns the name of the file system.
	Name() string

	// Size returns the total size of all files in the file system.
	Size() int64

	// Create creates a new file at key with expected size.
	Create(key string, size int64) (io.WriteCloser, error)

	// Delete deletes the value of key.
	Delete(key string) error

	// Open opens the file at key.
	Open(key string) (io.ReadCloser, error)

	// Stat returns the FileInfo of key.
	Stat(key string) (*FileInfo, error)

	// StatAll returns the FileInfo of all keys.
	StatAll() []*FileInfo
}