package git

import (
	"net/url"
	"regexp"
	"strings"
)

var httpURLSpan = regexp.MustCompile(`(?i)https?://[^\s"'<>]+`)

// DisplayURL hides HTTP userinfo without changing the endpoint used by Git.
func DisplayURL(raw string) string {
	lower := strings.ToLower(raw)
	if !strings.HasPrefix(lower, "http://") && !strings.HasPrefix(lower, "https://") {
		return raw
	}
	authority := raw[strings.Index(raw, "://")+3:]
	if end := strings.IndexAny(authority, "/?#"); end >= 0 {
		authority = authority[:end]
	}
	if !strings.Contains(authority, "@") {
		return raw
	}
	parsed, err := url.Parse(raw)
	if err != nil || parsed.User == nil || parsed.Host == "" {
		return "[redacted URL]"
	}
	parsed.User = url.User("redacted")
	return parsed.String()
}

func displayDiagnostic(message string) string {
	return httpURLSpan.ReplaceAllStringFunc(message, DisplayURL)
}

type displayError struct{ cause error }

func (err displayError) Error() string { return displayDiagnostic(err.cause.Error()) }
func (err displayError) Unwrap() error { return err.cause }