// 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.Shared.Extensions;
using Microsoft.CodeAnalysis.Text;

namespace Microsoft.CodeAnalysis.Completion.Providers;

internal abstract partial class AbstractMemberInsertingCompletionProvider
{
    protected abstract class AbstractItemGetter<TProvider>
        where TProvider : AbstractMemberInsertingCompletionProvider
    {
        protected static readonly SymbolDisplayFormat DefaultNameFormat = SymbolDisplayFormats.NameFormat
            .WithParameterOptions(
                SymbolDisplayParameterOptions.IncludeDefaultValue |
                SymbolDisplayParameterOptions.IncludeExtensionThis |
                SymbolDisplayParameterOptions.IncludeType |
                SymbolDisplayParameterOptions.IncludeName |
                SymbolDisplayParameterOptions.IncludeParamsRefOut)
            .AddMiscellaneousOptions(SymbolDisplayMiscellaneousOptions.IncludeNullableReferenceTypeModifier);

        protected readonly CancellationToken CancellationToken;
        protected readonly int Position;
        protected readonly TProvider Provider;

        protected readonly Document Document;
        protected readonly SourceText Text;
        protected readonly SyntaxTree SyntaxTree;
        protected readonly int StartLineNumber;

        protected AbstractItemGetter(
            TProvider provider,
            Document document,
            int position,
            SourceText text,
            SyntaxTree syntaxTree,
            int startLineNumber,
            CancellationToken cancellationToken)
        {
            Provider = provider;
            Document = document;
            Position = position;
            Text = text;
            SyntaxTree = syntaxTree;
            StartLineNumber = startLineNumber;
            CancellationToken = cancellationToken;
        }

        public abstract Task<ImmutableArray<CompletionItem>> GetItemsAsync();

        protected bool IsOnStartLine(int position)
            => Text.Lines.IndexOf(position) == StartLineNumber;
    }
}