// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Collections.Generic;
using Microsoft.Extensions.FileSystemGlobbing.Abstractions;

namespace Microsoft.Extensions.FileSystemGlobbing.Internal.PatternContexts
{
    public abstract class PatternContext<TFrame> : IPatternContext where TFrame : struct
    {
        private readonly Stack<TFrame> _stack = new();
        protected TFrame Frame;

        public virtual void Declare(Action<IPathSegment, bool> declare) { }

        public abstract PatternTestResult Test(FileInfoBase file);

        public abstract bool Test(DirectoryInfoBase directory);

        public abstract void PushDirectory(DirectoryInfoBase directory);

        public virtual void PopDirectory()
        {
            Frame = _stack.Pop();
        }

        protected void PushDataFrame(TFrame frame)
        {
            _stack.Push(Frame);
            Frame = frame;
        }

        protected bool IsStackEmpty()
        {
            return _stack.Count == 0;
        }
    }
}