// 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.

#nullable disable

using System;
using System.Collections.Immutable;
using System.IO;
using System.Threading;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeCleanup;
using Microsoft.CodeAnalysis.Tags;
using Microsoft.CodeAnalysis.Text;
using Roslyn.Utilities;

namespace Microsoft.CodeAnalysis.AddImport;

internal abstract partial class AbstractAddImportFeatureService<TSimpleNameSyntax>
{
    private sealed partial class MetadataSymbolReference(
        AbstractAddImportFeatureService<TSimpleNameSyntax> provider,
        SymbolResult<INamespaceOrTypeSymbol> symbolResult,
        ProjectId referenceProjectId,
        PortableExecutableReference reference) : SymbolReference(provider, symbolResult)
    {
        private readonly ProjectId _referenceProjectId = referenceProjectId;
        private readonly PortableExecutableReference _reference = reference;

        /// <summary>
        /// If we're adding a metadata-reference, then we always offer to do the add,
        /// even if there's an existing source-import in the file.
        /// </summary>
        protected override bool ShouldAddWithExistingImport(Document document) => true;

        protected override (string description, bool hasExistingImport) GetDescription(
            Document document, CodeCleanupOptions options, SyntaxNode node,
            SemanticModel semanticModel, CancellationToken cancellationToken)
        {
            var (description, hasExistingImport) = base.GetDescription(document, options, node, semanticModel, cancellationToken);
            if (description == null)
            {
                return (null, false);
            }

            return (string.Format(FeaturesResources.Add_reference_to_0, Path.GetFileName(_reference.FilePath)),
                    hasExistingImport);
        }

        protected override AddImportFixData GetFixData(
            Document document, ImmutableArray<TextChange> textChanges, string description,
            ImmutableArray<string> tags, CodeActionPriority priority)
        {
            return AddImportFixData.CreateForMetadataSymbol(
                textChanges, description, tags, priority,
                _referenceProjectId, _reference.FilePath);
        }

        // Adding metadata references should be considered lower pri than anything else.
        protected override CodeActionPriority GetPriority(Document document)
            => CodeActionPriority.Low;

        protected override ImmutableArray<string> GetTags(Document document)
            => WellKnownTagArrays.AddReference;

        public override bool Equals(object obj)
        {
            var reference = obj as MetadataSymbolReference;
            return base.Equals(reference) &&
                StringComparer.OrdinalIgnoreCase.Equals(_reference.FilePath, reference._reference.FilePath);
        }

        public override int GetHashCode()
            => Hash.Combine(
                base.GetHashCode(),
                StringComparer.OrdinalIgnoreCase.GetHashCode(_reference.FilePath));
    }
}