package model

import (
	"context"
	"io"
)

// Storage defines the interface for file storage operations
type Storage interface {
	// Save stores a file and returns the storage path
	Save(ctx context.Context, linkID string, filename string, reader io.Reader) (path string, err error)

	// Get retrieves a file from storage
	Get(ctx context.Context, path string) (io.ReadCloser, error)

	// Delete removes a file from storage
	Delete(ctx context.Context, path string) error

	// Exists checks if a file exists in storage
	Exists(ctx context.Context, path string) (bool, error)

	// DeleteDirectory removes an entire link directory and all its contents
	DeleteDirectory(ctx context.Context, linkID string) error
}

// GetPathForLink returns the relative storage path for a link directory.
// The path is relative to the storage base path.
// Example: GetPathForLink("abc-123") returns "abc-123"
func GetPathForLink(linkID string) string {
	return "links/" + linkID
}

// GetPathForLinkFile returns the relative storage path for a file within a link directory.
// The path is relative to the storage base path.
// Example: GetPathForLinkFile("abc-123", "document.pdf") returns "abc-123/document.pdf"
func GetPathForLinkFile(linkID, filename string) string {
	return GetPathForLink(linkID) + "/" + filename
}