// 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;
using System.Composition;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CodeRefactorings;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.LanguageServer.Handler.CodeActions;
using Microsoft.CodeAnalysis.Options;
using Roslyn.LanguageServer.Protocol;
using LSP = Roslyn.LanguageServer.Protocol;
 
namespace Microsoft.CodeAnalysis.LanguageServer.Handler;
 
/// <summary>
/// Handles the initial request for code actions. Leaves the Edit and Command properties of the returned
/// VSCodeActions blank, as these properties should be populated by the CodeActionsResolveHandler only when the user
/// requests them.
/// </summary>
[ExportCSharpVisualBasicStatelessLspService(typeof(CodeActionsHandler)), Shared]
[Method(LSP.Methods.TextDocumentCodeActionName)]
internal class CodeActionsHandler : ILspServiceDocumentRequestHandler<LSP.CodeActionParams, LSP.CodeAction[]>
{
    private readonly ICodeFixService _codeFixService;
    private readonly ICodeRefactoringService _codeRefactoringService;
    private readonly IGlobalOptionService _globalOptions;
 
    internal const string RunCodeActionCommandName = "Roslyn.RunCodeAction";
    internal const string RunFixAllCodeActionCommandName = "roslyn.client.fixAllCodeAction";
    internal const string RunNestedCodeActionCommandName = "roslyn.client.nestedCodeAction";
 
    public bool MutatesSolutionState => false;
    public bool RequiresLSPSolution => true;
 
    [ImportingConstructor]
    [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
    public CodeActionsHandler(
        ICodeFixService codeFixService,
        ICodeRefactoringService codeRefactoringService,
        IGlobalOptionService globalOptions)
    {
        _codeFixService = codeFixService;
        _codeRefactoringService = codeRefactoringService;
        _globalOptions = globalOptions;
    }
 
    public TextDocumentIdentifier GetTextDocumentIdentifier(CodeActionParams request) => request.TextDocument;
 
    public async Task<LSP.CodeAction[]> HandleRequestAsync(LSP.CodeActionParams request, RequestContext context, CancellationToken cancellationToken)
    {
        var document = context.GetRequiredTextDocument();
        var clientCapability = context.GetRequiredClientCapabilities();
        var codeActions = await CodeActionHelpers.GetVSCodeActionsAsync(
            request, document, _codeFixService, _codeRefactoringService, hasVsLspCapability: clientCapability.HasVisualStudioLspCapability(), cancellationToken).ConfigureAwait(false);
 
        return codeActions;
    }
}