package utils

import (
	"net/url"
	stdpath "path"
	"path/filepath"
	"runtime"
	"strings"

	"github.com/alist-org/alist/v3/internal/errs"
)

// StandardizePath convert path like '/' '/root' '/a/b'
func StandardizePath(path string) string {
	path = strings.TrimSuffix(path, "/")
	// abs path
	if filepath.IsAbs(path) && runtime.GOOS == "windows" {
		return path
	}
	// relative path with prefix '..'
	if strings.HasPrefix(path, ".") {
		return path
	}
	if !strings.HasPrefix(path, "/") {
		path = "/" + path
	}
	return path
}

// PathEqual judge path is equal
func PathEqual(path1, path2 string) bool {
	return StandardizePath(path1) == StandardizePath(path2)
}

func Ext(path string) string {
	ext := stdpath.Ext(path)
	if strings.HasPrefix(ext, ".") {
		return ext[1:]
	}
	return ext
}

func EncodePath(path string, all ...bool) string {
	seg := strings.Split(path, "/")
	toReplace := []struct {
		Src string
		Dst string
	}{
		{Src: "%", Dst: "%25"},
		{"%", "%25"},
		{"?", "%3F"},
		{"#", "%23"},
	}
	for i := range seg {
		if len(all) > 0 && all[0] {
			seg[i] = url.PathEscape(seg[i])
		} else {
			for j := range toReplace {
				seg[i] = strings.ReplaceAll(seg[i], toReplace[j].Src, toReplace[j].Dst)
			}
		}
	}
	return strings.Join(seg, "/")
}

func JoinBasePath(basePath, reqPath string) (string, error) {
	if strings.HasSuffix(reqPath, "..") || strings.Contains(reqPath, "../") {
		return "", errs.RelativePath
	}
	return stdpath.Join(basePath, reqPath), nil
}