// 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.Collections.Immutable;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Text;

namespace Microsoft.CodeAnalysis.Completion.Providers;

internal abstract class AbstractSuggestionModeCompletionProvider : LSPCompletionProvider
{
    protected abstract Task<CompletionItem?> GetSuggestionModeItemAsync(Document document, int position, TextSpan span, CompletionTrigger triggerInfo, CancellationToken cancellationToken);

    public override async Task ProvideCompletionsAsync(CompletionContext context)
    {
        context.SuggestionModeItem = await GetSuggestionModeItemAsync(
            context.Document, context.Position, context.CompletionListSpan, context.Trigger, context.CancellationToken).ConfigureAwait(false);
    }

    protected static CompletionItem CreateEmptySuggestionModeItem()
        => CreateSuggestionModeItem(displayText: null, description: null);

    public override ImmutableHashSet<char> TriggerCharacters => [];
}