// 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.Collections.Immutable;
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>
{
    /// <summary>
    /// Handles references to source symbols both from the current project the user is invoking
    /// 'add-import' from, as well as symbols from other viable projects.
    /// 
    /// In the case where the reference is from another project we put a glyph in the add using
    /// light bulb and we say "(from ProjectXXX)" to make it clear that this will do more than
    /// just add a using/import.
    /// </summary>
    private sealed partial class ProjectSymbolReference(
        AbstractAddImportFeatureService<TSimpleNameSyntax> provider,
        SymbolResult<INamespaceOrTypeSymbol> symbolResult,
        Project project) : SymbolReference(provider, symbolResult)
    {
        private readonly Project _project = project;

        protected override ImmutableArray<string> GetTags(Document document)
        {
            return document.Project.Id == _project.Id
                ? []
                : _project.Language == LanguageNames.CSharp
                    ? WellKnownTagArrays.CSharpProject
                    : _project.Language == LanguageNames.VisualBasic
                        ? WellKnownTagArrays.VisualBasicProject
                        : WellKnownTagArrays.AddReference;
        }

        /// <summary>
        /// If we're adding a reference to another project, it's ok to still add, even if there
        /// is an existing source-import in the file.  We won't add the import, but we'll still
        /// add the project-reference.
        /// </summary>
        protected override bool ShouldAddWithExistingImport(Document document)
            => document.Project.Id != _project.Id;

        protected override CodeActionPriority GetPriority(Document document)
        {
            // The only high priority fix we have is when we find a hit in our
            // own project and we don't need to do a rename.  Anything else (i.e.
            // we need to add a project reference, or we need to rename) is low
            // priority.

            if (document.Project.Id == _project.Id)
            {
                if (SearchResult.DesiredNameMatchesSourceName(document))
                {
                    // Set priority to high so Add Imports will appear above other suggested actions
                    // https://github.com/dotnet/roslyn/pull/33214
                    return CodeActionPriority.High;
                }
            }

            // This is a weaker match.  This should be lower than all other fixes.
            return CodeActionPriority.Low;
        }

        protected override AddImportFixData GetFixData(
            Document document, ImmutableArray<TextChange> textChanges, string description,
            ImmutableArray<string> tags, CodeActionPriority priority)
        {
            return AddImportFixData.CreateForProjectSymbol(
                textChanges, description, tags, priority, _project.Id);
        }

        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);
            }

            var project = document.Project;
            description = project.Id == _project.Id
                ? description
                : string.Format(FeaturesResources.Add_reference_to_0, _project.Name);

            return (description, hasExistingImport);
        }

        public override bool Equals(object obj)
        {
            var reference = obj as ProjectSymbolReference;
            return base.Equals(reference) &&
                _project.Id == reference._project.Id;
        }

        public override int GetHashCode()
            => Hash.Combine(_project.Id, base.GetHashCode());
    }
}