package filebackend

import (
	"errors"
	"os"

	"github.com/gorilla/feeds"
)

// FileBackend is a file-based storage backend for bacheca
type FileBackend struct {
	path string
}

// MakeFileBackend returns a FileBackend instance
func MakeFileBackend(path string) (*FileBackend, error) {
	stat, err := os.Stat(path)
	if err == nil && stat.IsDir() {
		return nil, errors.New("file backend must be a file")
	}
	return &FileBackend{
		path: path,
	}, err
}

// GetFeed returns the whole feed
func (b *FileBackend) GetFeed() (*feeds.Feed, error) {
	return nil, errors.New("not implemented")
}

// AddItem adds an item to the feed
func (b *FileBackend) AddItem(item feeds.Item) (string, error) {
	return "", errors.New("not implemented")
}

// RemoveItem removes an item by ID
func (b *FileBackend) RemoveItem(id string) error {
	return errors.New("not implemented")
}

// ReplaceItem replaces the item at a specified ID with the data provided
func (b *FileBackend) ReplaceItem(id string, item feeds.Item) error {
	return errors.New("not implemented")
}

// SetInfo sets the feed metadata (like title and description)
func (b *FileBackend) SetInfo(info feeds.Feed) error {
	return errors.New("not implemented")
}