﻿// 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.Linq;
using System.Threading;
using System.Threading.Tasks;
using Roslyn.Test.Utilities;
using Xunit;
using Xunit.Abstractions;
using LSP = Microsoft.VisualStudio.LanguageServer.Protocol;

namespace Microsoft.CodeAnalysis.LanguageServer.UnitTests.Formatting
{
    public class FormatDocumentRangeTests : AbstractLanguageServerProtocolTests
    {
        public FormatDocumentRangeTests(ITestOutputHelper testOutputHelper) : base(testOutputHelper)
        {
        }

        [Theory, CombinatorialData]
        public async Task TestFormatDocumentRangeAsync(bool mutatingLspWorkspace)
        {
            var markup =
@"class A
{
{|format:void|} M()
{
            int i = 1;
    }
}";
            var expected =
@"class A
{
    void M()
{
            int i = 1;
    }
}";
            await using var testLspServer = await CreateTestLspServerAsync(markup, mutatingLspWorkspace);
            var rangeToFormat = testLspServer.GetLocations("format").Single();
            var documentText = await testLspServer.GetCurrentSolution().GetDocuments(rangeToFormat.Uri).Single().GetTextAsync();

            var results = await RunFormatDocumentRangeAsync(testLspServer, rangeToFormat);
            var actualText = ApplyTextEdits(results, documentText);
            Assert.Equal(expected, actualText);
        }

        [Theory, CombinatorialData]
        public async Task TestFormatDocumentRange_UseTabsAsync(bool mutatingLspWorkspace)
        {
            var markup =
@"class A
{
{|format:void|} M()
{
			int i = 1;
	}
}";
            var expected =
@"class A
{
	void M()
{
			int i = 1;
	}
}";
            await using var testLspServer = await CreateTestLspServerAsync(markup, mutatingLspWorkspace);
            var rangeToFormat = testLspServer.GetLocations("format").Single();
            var documentText = await testLspServer.GetCurrentSolution().GetDocuments(rangeToFormat.Uri).Single().GetTextAsync();

            var results = await RunFormatDocumentRangeAsync(testLspServer, rangeToFormat, insertSpaces: false, tabSize: 4);
            var actualText = ApplyTextEdits(results, documentText);
            Assert.Equal(expected, actualText);
        }

        private static async Task<LSP.TextEdit[]> RunFormatDocumentRangeAsync(
            TestLspServer testLspServer,
            LSP.Location location,
            bool insertSpaces = true,
            int tabSize = 4)
        {
            return await testLspServer.ExecuteRequestAsync<LSP.DocumentRangeFormattingParams, LSP.TextEdit[]>(
                LSP.Methods.TextDocumentRangeFormattingName,
                CreateDocumentRangeFormattingParams(location, insertSpaces, tabSize),
                CancellationToken.None);
        }

        private static LSP.DocumentRangeFormattingParams CreateDocumentRangeFormattingParams(
            LSP.Location location,
            bool insertSpaces,
            int tabSize)
            => new LSP.DocumentRangeFormattingParams()
            {
                Range = location.Range,
                TextDocument = CreateTextDocumentIdentifier(location.Uri),
                Options = new LSP.FormattingOptions()
                {
                    InsertSpaces = insertSpaces,
                    TabSize = tabSize
                }
            };
    }
}
