package api

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

const maxIconValueLength = 160

var (
	legacyIconPattern   = regexp.MustCompile(`^[A-Za-z0-9_-]+(?:\s+[A-Za-z0-9_-]+)*$`)
	iconifyValuePattern = regexp.MustCompile(`^iconify:[a-z0-9]+(?:-[a-z0-9]+)*:[a-z0-9]+(?:-[a-z0-9]+)*$`)
)

func validHTTPURL(value string) bool {
	parsed, err := url.ParseRequestURI(strings.TrimSpace(value))
	return err == nil && parsed.Host != "" && (parsed.Scheme == "http" || parsed.Scheme == "https")
}

func validContactURL(value string) bool {
	value = strings.TrimSpace(value)
	parsed, err := url.ParseRequestURI(value)
	if err != nil {
		return false
	}
	if parsed.Scheme == "http" || parsed.Scheme == "https" {
		return parsed.Host != ""
	}
	return parsed.Scheme == "mailto" || parsed.Scheme == "tel"
}

func validQRCode(value string) bool {
	value = strings.TrimSpace(value)
	if strings.HasPrefix(value, "/uploads/") {
		return !strings.Contains(value, "\\") && path.Clean(value) == value
	}
	return validHTTPURL(value)
}

func validIconValue(value string) bool {
	value = strings.TrimSpace(value)
	if value == "" || len(value) > maxIconValueLength {
		return false
	}
	if strings.HasPrefix(value, "iconify:") {
		return iconifyValuePattern.MatchString(value)
	}
	return legacyIconPattern.MatchString(value)
}