// 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.Composition;
using System.Diagnostics.CodeAnalysis;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CodeFixes.GenerateMember;
using Microsoft.CodeAnalysis.CSharp.Extensions;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.GenerateMember.GenerateParameterizedMember;
using Microsoft.CodeAnalysis.Shared.Extensions;

namespace Microsoft.CodeAnalysis.CSharp.CodeFixes.GenerateMethod;

[ExportCodeFixProvider(LanguageNames.CSharp, Name = PredefinedCodeFixProviderNames.GenerateConversion), Shared]
[ExtensionOrder(After = PredefinedCodeFixProviderNames.GenerateEnumMember)]
[method: ImportingConstructor]
[method: SuppressMessage("RoslynDiagnosticsReliability", "RS0033:Importing constructor should be [Obsolete]", Justification = "Used in test code: https://github.com/dotnet/roslyn/issues/42814")]
internal sealed class GenerateConversionCodeFixProvider() : AbstractGenerateMemberCodeFixProvider
{
    private const string CS0029 = nameof(CS0029); // error CS0029: Cannot implicitly convert type 'type' to 'type'
    private const string CS0030 = nameof(CS0030); // error CS0030: Cannot convert type 'type' to 'type'

    public override ImmutableArray<string> FixableDiagnosticIds
    {
        get { return [CS0029, CS0030]; }
    }

    protected override bool IsCandidate(SyntaxNode node, SyntaxToken token, Diagnostic diagnostic)
    {
        return node.Kind()
                is SyntaxKind.IdentifierName
                or SyntaxKind.MethodDeclaration
                or SyntaxKind.InvocationExpression
                or SyntaxKind.CastExpression ||
               node is LiteralExpressionSyntax ||
               node is SimpleNameSyntax ||
               node is ExpressionSyntax;
    }

    protected override SyntaxNode? GetTargetNode(SyntaxNode node)
    {
        if (node is InvocationExpressionSyntax invocation)
            return invocation.Expression.GetRightmostName();

        if (node is MemberBindingExpressionSyntax memberBindingExpression)
            return memberBindingExpression.Name;

        return node;
    }

    protected override Task<ImmutableArray<CodeAction>> GetCodeActionsAsync(
        Document document, SyntaxNode node, CancellationToken cancellationToken)
    {
        var service = document.GetRequiredLanguageService<IGenerateConversionService>();
        return service.GenerateConversionAsync(document, node, cancellationToken);
    }
}