using System.Text.RegularExpressions;

namespace MeloongCore;
public static class EscapeUtils {

    /// <summary>
    /// XML 转义。
    /// </summary>
    public static string? XmlEscape(string? str) {
        if (str is null) return null;
        if (str.StartsWithF("{")) str = "{}" + str; // #4187
        return str
            .Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;").Replace("'", "&apos;")
            .Replace("\"", "&quot;").ReplaceLineEndings("&#xa;");
    }

    /// <summary>
    /// VB.NET 的 Like 关键字转义。
    /// </summary>
    public static string LikePatternEscape(string input) {
        var builder = new StringBuilder();
        foreach (char c in input) {
            if (c is '[' or ']' or '*' or '?' or '#') {
                builder.Append('[').Append(c).Append(']');
            } else {
                builder.Append(c);
            }
        }
        return builder.ToString();
    }

    /// <summary>
    /// 正则表达式转义。等同于 Regex.Escape。
    /// </summary>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static string? RegexEscape(string? value) => Regex.Escape(value);

    /// <summary>
    /// 正则表达式去转义。等同于 Regex.Unescape。
    /// </summary>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static string? RegexUnescape(string? value) => Regex.Unescape(value);

    /// <summary>
    /// URL 转义。等同于 Uri.EscapeDataString。
    /// </summary>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static string? UrlEscape(string? value) => Uri.EscapeDataString(value);

    /// <summary>
    /// URL 去转义。等同于 Uri.UnescapeDataString。
    /// </summary>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static string? UrlUnescape(string? value) => Uri.UnescapeDataString(value);

    /// <summary>
    /// 表单转义。等同于 WebUtility.UrlEncode。
    /// </summary>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static string? FormUrlEscape(string? value) => WebUtility.UrlEncode(value);

    /// <summary>
    /// 表单去转义。等同于 WebUtility.UrlDecode。
    /// </summary>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static string? FormUrlUnescape(string? value) => WebUtility.UrlDecode(value);

    /// <summary>
    /// HTML 转义。等同于 WebUtility.HtmlEncode。
    /// </summary>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static string? HtmlEscape(string? value) => WebUtility.HtmlEncode(value);

    /// <summary>
    /// HTML 去转义。等同于 WebUtility.HtmlDecode。
    /// </summary>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static string? HtmlUnescape(string? value) => WebUtility.HtmlDecode(value);

}