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 *
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 * obtaining a copy of this software and associated documentation
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using System.Collections.Immutable;
using System.Composition;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Opc.Ua.MigrationAnalyzer.Diagnostics;

namespace Opc.Ua.MigrationAnalyzer.CodeFixer
{
    /// <summary>
    /// UA0012 code fix: rewrite <c>CertificateFactory.X(args)</c> as
    /// <c>DefaultCertificateFactory.Instance.X(args)</c>.
    /// </summary>
    [ExportCodeFixProvider(LanguageNames.CSharp, Name = nameof(UA0012CertificateFactoryStaticToInstanceCodeFix))]
    [Shared]
    public sealed class UA0012CertificateFactoryStaticToInstanceCodeFix : CodeFixProvider
    {
        public override ImmutableArray<string> FixableDiagnosticIds { get; } =
            [DiagnosticIds.UA0012];

        public override FixAllProvider GetFixAllProvider()
        {
            return WellKnownFixAllProviders.BatchFixer;
        }

        public override async Task RegisterCodeFixesAsync(CodeFixContext context)
        {
            SyntaxNode root = (await context.Document.GetSyntaxRootAsync(context.CancellationToken)
                .ConfigureAwait(false))!;

            foreach (Diagnostic diagnostic in context.Diagnostics)
            {
                SyntaxNode node = root.FindNode(diagnostic.Location.SourceSpan, getInnermostNodeForTie: true);
                InvocationExpressionSyntax invocation = node.AncestorsAndSelf()
                    .OfType<InvocationExpressionSyntax>()
                    .FirstOrDefault();
                if (invocation is null || invocation.Expression is not MemberAccessExpressionSyntax member)
                {
                    continue;
                }

                context.RegisterCodeFix(
                    CodeAction.Create(
                        title: "Use 'DefaultCertificateFactory.Instance'",
                        createChangedDocument: ct => ApplyAsync(context.Document, invocation, member, ct),
                        equivalenceKey: DiagnosticIds.UA0012),
                    diagnostic);
            }
        }

        private static async Task<Document> ApplyAsync(
            Document document,
            InvocationExpressionSyntax invocation,
            MemberAccessExpressionSyntax member,
            CancellationToken cancellationToken)
        {
            MemberAccessExpressionSyntax newReceiver = SyntaxFactory.MemberAccessExpression(
                SyntaxKind.SimpleMemberAccessExpression,
                SyntaxFactory.IdentifierName("DefaultCertificateFactory"),
                SyntaxFactory.IdentifierName("Instance"));

            MemberAccessExpressionSyntax newMember = SyntaxFactory.MemberAccessExpression(
                SyntaxKind.SimpleMemberAccessExpression,
                newReceiver,
                member.Name);

            InvocationExpressionSyntax replacement = invocation
                .WithExpression(newMember)
                .WithTriviaFrom(invocation);

            SyntaxNode root = (await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false))!;
            SyntaxNode newRoot = root.ReplaceNode(invocation, replacement);
            return document.WithSyntaxRoot(newRoot);
        }
    }
}