// 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;
using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.Classification;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.UnitTests.Classification;
 
public static class ClassificationTestHelper
{
    private static string GetText(FormattedClassification formattedClassification)
        => $"({formattedClassification.Text}, {formattedClassification.ClassificationName})";
 
    private static string GetText(ClassifiedSpan tuple)
        => $"({tuple.TextSpan}, {tuple.ClassificationType})";
 
    public static void VerifyTextAndClassifications(
        string expectedText,
        IEnumerable<FormattedClassification> expectedClassifications,
        string actualText,
        IEnumerable<ClassifiedSpan> actualClassifications)
    {
        Assert.Equal(expectedText, actualText);
 
        if (expectedClassifications != null)
        {
            var expectedClassificationList = expectedClassifications.ToList();
            var actualClassificationList = actualClassifications.ToList();
 
            actualClassificationList.Sort((t1, t2) => t1.TextSpan.Start - t2.TextSpan.Start);
 
            var max = Math.Max(expectedClassificationList.Count, actualClassificationList.Count);
            for (var i = 0; i < max; i++)
            {
                if (i >= expectedClassificationList.Count)
                {
                    AssertEx.Fail("Unexpected actual classification: {0}", GetText(actualClassificationList[i]));
                }
                else if (i >= actualClassificationList.Count)
                {
                    AssertEx.Fail("Missing classification for: {0}", GetText(expectedClassificationList[i]));
                }
 
                var actual = actualClassificationList[i];
                var expected = expectedClassificationList[i];
 
                var text = actualText.Substring(actual.TextSpan.Start, actual.TextSpan.Length);
                Assert.Equal(expected.Text, text);
                Assert.Equal(expected.ClassificationName, actual.ClassificationType);
            }
        }
    }
 
    public static void VerifyTextAndClassifications(
        string expectedText,
        IEnumerable<FormattedClassification> expectedClassifications,
        IList<TaggedText> actualContent)
    {
        VerifyTextAndClassifications(
            expectedText,
            expectedClassifications,
            actualText: actualContent.GetFullText(),
            actualClassifications: actualContent.ToClassifiedSpans());
    }
}