// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Text;
using System.Text.RegularExpressions;
 
namespace Aspire.Dashboard.ConsoleLogs;
public static partial class UrlParser
{
    private static readonly Regex s_urlRegEx = GenerateUrlRegEx();
 
    public static bool TryParse(string? text, [NotNullWhen(true)] out string? modifiedText)
    {
        if (text is not null)
        {
            var urlMatch = s_urlRegEx.Match(text);
 
            var builder = new StringBuilder(text.Length * 2);
 
            var nextCharIndex = 0;
            while (urlMatch.Success)
            {
                if (urlMatch.Index > 0)
                {
                    builder.Append(text[(nextCharIndex)..urlMatch.Index]);
                }
 
                var urlStart = urlMatch.Index;
                nextCharIndex = urlMatch.Index + urlMatch.Length;
                var url = text[urlStart..nextCharIndex];
 
                builder.Append(CultureInfo.InvariantCulture, $"<a target=\"_blank\" href=\"{url}\">{url}</a>");
                urlMatch = urlMatch.NextMatch();
            }
 
            if (builder.Length > 0)
            {
                if (nextCharIndex < text.Length)
                {
                    builder.Append(text[(nextCharIndex)..]);
                }
 
                modifiedText = builder.ToString();
                return true;
            }
        }
 
        modifiedText = null;
        return false;
    }
 
    // Regular expression that detects http/https URLs in a log entry
    // Based on the RegEx used in Windows Terminal for the same purpose, but limited
    // to only http/https URLs
    //
    // Explanation:
    // /b                             - Match must start at a word boundary (after whitespace or at the start of the text)
    // https?://                      - http:// or https://
    // [-A-Za-z0-9+&@#/%?=~_|$!:,.;]* - Any character in the list, matched zero or more times.
    // [A-Za-z0-9+&@#/%=~_|$]         - Any character in the list, matched exactly once
    [GeneratedRegex("\\bhttps?://[-A-Za-z0-9+&@#/%?=~_|$!:,.;]*[A-Za-z0-9+&@#/%=~_|$]")]
    private static partial Regex GenerateUrlRegEx();
}