// 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.LanguageService;
using Microsoft.CodeAnalysis.Options;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.Completion.Providers;
 
internal abstract class AbstractCrefCompletionProvider : LSPCompletionProvider
{
    protected const string HideAdvancedMembers = nameof(HideAdvancedMembers);
 
    internal override async Task<CompletionDescription> GetDescriptionWorkerAsync(
        Document document, CompletionItem item, CompletionOptions options, SymbolDescriptionOptions displayOptions, CancellationToken cancellationToken)
    {
        var position = SymbolCompletionItem.GetContextPosition(item);
 
        // What EditorBrowsable settings were we previously passed in (if it mattered)?
        if (item.TryGetProperty(HideAdvancedMembers, out var hideAdvancedMembersString) &&
            bool.TryParse(hideAdvancedMembersString, out var hideAdvancedMembers))
        {
            options = options with
            {
                MemberDisplayOptions = new() { HideAdvancedMembers = hideAdvancedMembers }
            };
        }
 
        var (token, semanticModel, symbols) = await GetSymbolsAsync(document, position, options, cancellationToken).ConfigureAwait(false);
        if (symbols.Length == 0)
        {
            return CompletionDescription.Empty;
        }
 
        Contract.ThrowIfNull(semanticModel);
 
        var name = SymbolCompletionItem.GetSymbolName(item);
        var kind = SymbolCompletionItem.GetKind(item);
        var bestSymbols = symbols.WhereAsArray(s => s.Kind == kind && s.Name == name);
        return await SymbolCompletionItem.GetDescriptionAsync(item, bestSymbols, document, semanticModel, displayOptions, cancellationToken).ConfigureAwait(false);
    }
 
    protected abstract Task<(SyntaxToken, SemanticModel?, ImmutableArray<ISymbol>)> GetSymbolsAsync(
        Document document, int position, CompletionOptions options, CancellationToken cancellationToken);
}