// 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.CodeFixes;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Shared.Extensions;

namespace Microsoft.CodeAnalysis.ConvertTypeOfToNameOf;

internal abstract class AbstractConvertTypeOfToNameOfCodeFixProvider<
    TMemberAccessExpressionSyntax> : SyntaxEditorBasedCodeFixProvider
    where TMemberAccessExpressionSyntax : SyntaxNode
{
    protected abstract string GetCodeFixTitle();

    protected abstract SyntaxNode ConvertToUnboundGeneric(ParseOptions options, SyntaxNode nameOfSyntax);
    protected abstract SyntaxNode GetSymbolTypeExpression(SemanticModel model, TMemberAccessExpressionSyntax node, CancellationToken cancellationToken);

    public sealed override ImmutableArray<string> FixableDiagnosticIds
       => [IDEDiagnosticIds.ConvertTypeOfToNameOfDiagnosticId];

    public override async Task RegisterCodeFixesAsync(CodeFixContext context)
    {
        var title = GetCodeFixTitle();
        RegisterCodeFix(context, title, title);
    }

    protected override async Task FixAllAsync(
        Document document, ImmutableArray<Diagnostic> diagnostics,
        SyntaxEditor editor, CancellationToken cancellationToken)
    {
        var semanticModel = await document.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
        foreach (var diagnostic in diagnostics)
        {
            if (editor.OriginalRoot.FindNode(diagnostic.Location.SourceSpan, getInnermostNodeForTie: true) is not TMemberAccessExpressionSyntax node)
                continue;

            ConvertTypeOfToNameOf(semanticModel, editor, node, cancellationToken);
        }
    }

    /// <Summary>
    ///  Method converts typeof(...).Name to nameof(...)
    /// </Summary>
    private void ConvertTypeOfToNameOf(
        SemanticModel semanticModel,
        SyntaxEditor editor,
        TMemberAccessExpressionSyntax nodeToReplace,
        CancellationToken cancellationToken)
    {
        var typeExpression = GetSymbolTypeExpression(semanticModel, nodeToReplace, cancellationToken);
        var nameOfSyntax = editor.Generator.NameOfExpression(typeExpression);
        editor.ReplaceNode(
            nodeToReplace,
            ConvertToUnboundGeneric(semanticModel.SyntaxTree.Options, nameOfSyntax));
    }
}