// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System;
using System.Collections.Immutable;
using Microsoft.VisualStudio.Shell.TableControl;
 
namespace Microsoft.VisualStudio.LanguageServices.EditorConfigSettings.Common
{
    internal abstract class SettingsEntriesSnapshotBase<T> : WpfTableEntriesSnapshotBase
    {
        private readonly ImmutableArray<T> _data;
        private readonly int _currentVersionNumber;
 
        public SettingsEntriesSnapshotBase(ImmutableArray<T> data, int currentVersionNumber)
        {
            _data = data;
            _currentVersionNumber = currentVersionNumber;
        }
 
        public override int VersionNumber => _currentVersionNumber;
        public override int Count => _data.Length;
 
        public override bool TryGetValue(int index, string keyName, out object? content)
        {
            T? result;
            try
            {
                if (index < 0 || index > _data.Length)
                {
                    content = null;
                    return false;
                }
 
                result = _data[index];
 
                if (result == null)
                {
                    content = null;
                    return false;
                }
            }
            catch (Exception)
            {
                content = null;
                return false;
            }
 
            return TryGetValue(result, keyName, out content);
        }
 
        protected abstract bool TryGetValue(T result, string keyName, out object? content);
    }
}