using System.CommandLine.Parsing;
using System.Text.RegularExpressions;
using Microsoft.Extensions.FileSystemGlobbing;

namespace Geekeey.Core;

internal static class Parsers
{
    public static Uri? Uri(ArgumentResult result)
    {
        if (!result.Tokens.Any())
        {
            return null;
        }

        if (!System.Uri.TryCreate(result.Tokens.Single().Value, UriKind.RelativeOrAbsolute, out var uri))
        {
            result.AddError("Not a valid URI.");
            return null;
        }

        return uri;
    }

    public static Pattern? Pattern(ArgumentResult result)
    {
        if (!result.Tokens.Any())
        {
            return null;
        }

        if (bool.TryParse(result.Tokens.Single().Value, out var value))
        {
            return new Pattern(value);
        }

        try
        {
            var regex = new Regex(result.Tokens.Single().Value, RegexOptions.Compiled | RegexOptions.IgnoreCase);
            return new Pattern(regex);
        }
        catch (ArgumentException)
        {
            result.AddError("Not a valid boolean or regex pattern.");
            return null;
        }
    }

    public static Matcher? Matcher(ArgumentResult result)
    {
        if (!result.Tokens.Any())
        {
            return null;
        }

        var matcher = new Matcher();

        foreach (var token in result.Tokens)
        {
            try
            {
                if (token.Value.StartsWith('!'))
                {
                    matcher.AddExclude(token.Value[1..]);
                }
                else
                {
                    matcher.AddInclude(token.Value);
                }
            }
            catch (Exception exception)
            {
                result.AddError($"Not a valid glob pattern: {token.Value}. {exception.Message}");
                return null;
            }
        }

        return matcher;
    }
}

internal sealed class Pattern
{
    private readonly bool _value;
    private readonly Regex? _pattern;

    public Pattern(bool value)
    {
        _value = value;
    }

    public Pattern(Regex pattern)
    {
        _pattern = pattern;
    }

    public bool Match(string version)
    {
        return _pattern?.IsMatch(version) ?? _value;
    }
}