package filesystem

import (
	"fmt"
	"os"
	"path/filepath"
)

func Open(path string) (*Storage, error) {
	info, err := os.Stat(path)
	if err != nil {
		return nil, err
	}

	if !info.IsDir() {
		return nil, fmt.Errorf("provided path %s is not a directory", path)
	}

	abs, err := filepath.Abs(path)
	if err != nil {
		return nil, fmt.Errorf("could not tarnslate %s to absolute path", path)
	}

	return &Storage{prefix: abs}, nil
}

type Storage struct {
	prefix string
}

func (s *Storage) Save(key string, data []byte) error {
	path := s.toAbs(key)

	if err := os.WriteFile(path, data, 0664); err != nil {
		return err
	}

	return nil
}

func (s *Storage) Load(key string) ([]byte, error) {
	path := s.toAbs(key)

	b, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}

	return b, nil
}

func (s *Storage) Delete(key string) error {
	path := s.toAbs(key)

	err := os.Remove(path)
	if err != nil && os.IsNotExist(err) {
		return nil
	} else if err != nil {
		return err
	}

	return nil
}

func (s *Storage) Close() error {
	return nil
}

func (s *Storage) toAbs(path string) string {
	return filepath.Join(s.prefix, path)
}