// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
namespace Microsoft.AspNetCore.Routing.Matching;
 
internal sealed class SingleEntryJumpTable : JumpTable
{
    private readonly int _defaultDestination;
    private readonly int _exitDestination;
    private readonly string _text;
    private readonly int _destination;
 
    public SingleEntryJumpTable(
        int defaultDestination,
        int exitDestination,
        string text,
        int destination)
    {
        _defaultDestination = defaultDestination;
        _exitDestination = exitDestination;
        _text = text;
        _destination = destination;
    }
 
    public override int GetDestination(string path, PathSegment segment)
    {
        var length = segment.Length;
        if (length == 0)
        {
            return _exitDestination;
        }
 
        var pathSpan = path.AsSpan(segment.Start, length);
        if (pathSpan.Equals(_text, StringComparison.OrdinalIgnoreCase))
        {
            return _destination;
        }
 
        return _defaultDestination;
    }
 
    public override string DebuggerToString()
    {
        return $"{{ {_text}: {_destination}, $+: {_defaultDestination}, $0: {_exitDestination} }}";
    }
}