﻿// 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.Collections.Immutable;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeRefactorings;
using Microsoft.CodeAnalysis.CodeRefactorings.MoveType;
using Microsoft.CodeAnalysis.Diagnostics;
using Microsoft.CodeAnalysis.Editor.UnitTests.CodeActions;
using Microsoft.CodeAnalysis.Editor.UnitTests.Diagnostics;
using Microsoft.CodeAnalysis.Shared.Utilities;
using Microsoft.CodeAnalysis.Test.Utilities;
using Microsoft.CodeAnalysis.Text;
using Microsoft.CodeAnalysis.UnitTests;
using Roslyn.Test.Utilities;
using Xunit;

namespace Microsoft.CodeAnalysis.Editor.UnitTests.MoveType
{
    public abstract class AbstractMoveTypeTest : AbstractCodeActionTest
    {
        private readonly string RenameFileCodeActionTitle = FeaturesResources.Rename_file_to_0;
        private readonly string RenameTypeCodeActionTitle = FeaturesResources.Rename_type_to_0;

        // TODO: Requires WPF due to IInlineRenameService dependency (https://github.com/dotnet/roslyn/issues/46153)
        protected override TestComposition GetComposition()
            => EditorTestCompositions.EditorFeaturesWpf
                .AddExcludedPartTypes(typeof(IDiagnosticUpdateSourceRegistrationService))
                .AddParts(typeof(MockDiagnosticUpdateSourceRegistrationService));

        protected override CodeRefactoringProvider CreateCodeRefactoringProvider(Workspace workspace, TestParameters parameters)
            => new MoveTypeCodeRefactoringProvider();

        protected async Task TestRenameTypeToMatchFileAsync(
            string originalCode,
            string expectedCode = null,
            bool expectedCodeAction = true,
            object fixProviderData = null)
        {
            var testOptions = new TestParameters(fixProviderData: fixProviderData);
            using (var workspace = CreateWorkspaceFromOptions(originalCode, testOptions))
            {
                if (expectedCodeAction)
                {
                    Assert.True(expectedCode != null, $"{nameof(expectedCode)} should be present if {nameof(expectedCodeAction)} is true.");

                    var documentId = workspace.Documents[0].Id;
                    var documentName = workspace.Documents[0].Name;
                    MarkupTestFile.GetSpan(expectedCode, out var expectedText, out var span);

                    var codeActionTitle = string.Format(RenameTypeCodeActionTitle, expectedText.Substring(span.Start, span.Length));

                    var oldSolutionAndNewSolution = await TestOperationAsync(
                        testOptions, workspace, expectedText, codeActionTitle);

                    // the original source document does not exist in the new solution.
                    var newSolution = oldSolutionAndNewSolution.Item2;

                    var document = newSolution.GetDocument(documentId);
                    Assert.NotNull(document);
                    Assert.Equal(documentName, document.Name);
                }
                else
                {
                    var (actions, _) = await GetCodeActionsAsync(workspace, testOptions);

                    if (actions.Length > 0)
                    {
                        var renameFileAction = actions.Any(static (action, self) => action.Title.StartsWith(self.RenameTypeCodeActionTitle), this);
                        Assert.False(renameFileAction, "Rename Type to match file name code action was not expected, but shows up.");
                    }
                }
            }
        }

        protected async Task TestRenameFileToMatchTypeAsync(
            string originalCode,
            string expectedDocumentName = null,
            bool expectedCodeAction = true,
            IList<string> destinationDocumentContainers = null,
            object fixProviderData = null)
        {
            var testOptions = new TestParameters(fixProviderData: fixProviderData);
            using (var workspace = CreateWorkspaceFromOptions(originalCode, testOptions))
            {
                if (expectedCodeAction)
                {
                    Assert.True(expectedDocumentName != null, $"{nameof(expectedDocumentName)} should be present if {nameof(expectedCodeAction)} is true.");

                    var oldDocumentId = workspace.Documents[0].Id;
                    var expectedText = workspace.Documents[0].GetTextBuffer().CurrentSnapshot.GetText();
                    var spans = workspace.Documents[0].SelectedSpans;

                    var codeActionTitle = string.Format(RenameFileCodeActionTitle, expectedDocumentName);

                    var oldSolutionAndNewSolution = await TestOperationAsync(
                        testOptions, workspace, expectedText, codeActionTitle);

                    // The code action updated the Name of the file in-place
                    var newSolution = oldSolutionAndNewSolution.Item2;
                    var newDocument = newSolution.GetDocument(oldDocumentId);
                    Assert.Equal(expectedDocumentName, newDocument.Name);

                    if (destinationDocumentContainers != null)
                    {
                        Assert.Equal(destinationDocumentContainers, newDocument.Folders);
                    }
                }
                else
                {
                    var (actions, _) = await GetCodeActionsAsync(workspace, testOptions);

                    if (actions.Length > 0)
                    {
                        var renameFileAction = actions.Any(static (action, self) => action.Title.StartsWith(self.RenameFileCodeActionTitle), this);
                        Assert.False(renameFileAction, "Rename File to match type code action was not expected, but shows up.");
                    }
                }
            }
        }

        private async Task<Tuple<Solution, Solution>> TestOperationAsync(
            TestParameters parameters,
            Workspaces.TestWorkspace workspace,
            string expectedCode,
            string operation)
        {
            var (actions, _) = await GetCodeActionsAsync(workspace, parameters);
            var action = actions.Single(a => a.Title.Equals(operation, StringComparison.CurrentCulture));
            var operations = await action.GetOperationsAsync(
                workspace.CurrentSolution, new ProgressTracker(), CancellationToken.None);

            return await TestOperationsAsync(workspace,
                expectedText: expectedCode,
                operations: operations,
                conflictSpans: ImmutableArray<TextSpan>.Empty,
                renameSpans: ImmutableArray<TextSpan>.Empty,
                warningSpans: ImmutableArray<TextSpan>.Empty,
                navigationSpans: ImmutableArray<TextSpan>.Empty,
                expectedChangedDocumentId: null);
        }

        private protected async Task TestMoveTypeToNewFileAsync(
            string originalCode,
            string expectedSourceTextAfterRefactoring,
            string expectedDocumentName,
            string destinationDocumentText,
            ImmutableArray<string> destinationDocumentContainers = default,
            bool expectedCodeAction = true,
            int index = 0,
            OptionsCollection options = null)
        {
            var testOptions = new TestParameters(index: index, options: options);
            if (expectedCodeAction)
            {
                using var workspace = CreateWorkspaceFromOptions(originalCode, testOptions);

                // replace with default values on null.
                destinationDocumentContainers = destinationDocumentContainers.NullToEmpty();

                var sourceDocumentId = workspace.Documents[0].Id;

                // Verify the newly added document and its text
                var oldSolutionAndNewSolution = await TestAddDocumentAsync(
                    testOptions, workspace, destinationDocumentText,
                    expectedDocumentName, destinationDocumentContainers);

                // Verify source document's text after moving type.
                var oldSolution = oldSolutionAndNewSolution.Item1;
                var newSolution = oldSolutionAndNewSolution.Item2;
                var changedDocumentIds = SolutionUtilities.GetChangedDocuments(oldSolution, newSolution);
                Assert.True(changedDocumentIds.Contains(sourceDocumentId), "source document was not changed.");

                var modifiedSourceDocument = newSolution.GetDocument(sourceDocumentId);
                var actualSourceTextAfterRefactoring = (await modifiedSourceDocument.GetTextAsync()).ToString();
                Assert.Equal(expectedSourceTextAfterRefactoring, actualSourceTextAfterRefactoring);
            }
            else
            {
                await TestMissingAsync(originalCode);
            }
        }
    }
}
