// Copyright (C) 2022 Marius Schellenberger

package parse

import (
	"cachefs/pkg/provider"
	"cachefs/pkg/provider/crypto"
	"cachefs/pkg/provider/os"
	"cachefs/pkg/provider/sftp"
	"errors"
	"fmt"
	neturl "net/url"
	"path/filepath"

	"k8s.io/klog/v2/klogr"
)

var (
	ErrPathNotAbsolute   = errors.New("path is not absolute")
	ErrUnsupportedScheme = errors.New("unsupported scheme")
)

func FS(url string, key []byte) (provider.FS, error) {
	u, err := neturl.Parse(url)
	if err != nil {
		return nil, err
	}
	if !filepath.IsAbs(u.Path) {
		return nil, ErrPathNotAbsolute
	}
	var fs provider.FS
	switch u.Scheme {
	case "file":
		fs, err = os.NewFS(u.Path)
	case "sftp":
		fs, err = sftp.NewFS(u, klogr.New().WithName("sftp"))
	default:
		return nil, fmt.Errorf("%w: %s", ErrUnsupportedScheme, u.Scheme)
	}
	if err != nil {
		return nil, err
	}
	if key != nil {
		fs, err = crypto.NewFS(fs, key)
	}
	return fs, err
}