// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;

namespace System.Windows.Forms.Design.Tests;

public class WindowsFormsDesignerOptionServiceTests
{
    [Fact]
    public void WindowsFormsDesignerOptionService_Ctor_Default()
    {
        WindowsFormsDesignerOptionService service = new();
        DesignerOptions options = service.CompatibilityOptions;
        Assert.True(options.EnableInSituEditing);
        Assert.Equal(new Size(8, 8), options.GridSize);
        Assert.True(options.ObjectBoundSmartTagAutoShow);
        Assert.True(options.ShowGrid);
        Assert.True(options.SnapToGrid);
        Assert.False(options.UseSmartTags);
        Assert.False(options.UseSnapLines);
        Assert.False(options.UseOptimizedCodeGeneration);
        Assert.Same(options, service.CompatibilityOptions);
    }

    [Fact]
    public void WindowsFormsDesignerOptionService_Options_Get_ReturnsExpected()
    {
        WindowsFormsDesignerOptionService service = new();
        Assert.Empty(service.Options.Name);
        DesignerOptionService.DesignerOptionCollection childCollection = Assert.IsType<DesignerOptionService.DesignerOptionCollection>(Assert.Single(service.Options));
        Assert.Equal("DesignerOptions", childCollection.Name);
        Assert.Same(service.Options, childCollection.Parent);
        Assert.Equal(new string[] { "EnableInSituEditing", "GridSize", "ObjectBoundSmartTagAutoShow", "ShowGrid", "SnapToGrid", "UseOptimizedCodeGeneration", "UseSmartTags", "UseSnapLines" }, childCollection.Properties.Sort().Cast<PropertyDescriptor>().Select(p => p.Name));
        Assert.Empty(childCollection);
    }

    [Fact]
    public void WindowsFormsDesignerOptionService_Options_GetNullDesignerOptions_ReturnsExpected()
    {
        NullCompatibilityOptions service = new();
        Assert.Empty(service.Options.Name);
        Assert.Empty(service.Options);
    }

    [Fact]
    public void WindowsFormsDesignerOptionService_PopulateOptionCollection_ValidOptionsFromSameClass_Success()
    {
        SubWindowsFormsDesignerOptionService service = new();
        service.PopulateOptionCollectionEntry(service.Options);
        Assert.Equal(1, service.PopulateOptionCollectionCallCount);

        // Should not retrieve again when accessing Options.
        DesignerOptionService.DesignerOptionCollection childCollection = Assert.IsType<DesignerOptionService.DesignerOptionCollection>(Assert.Single(service.Options));
        Assert.Equal(1, service.PopulateOptionCollectionCallCount);
        Assert.Equal("DesignerOptions", childCollection.Name);
        Assert.Same(service.Options, childCollection.Parent);
        Assert.Equal(new string[] { "EnableInSituEditing", "GridSize", "ObjectBoundSmartTagAutoShow", "ShowGrid", "SnapToGrid", "UseOptimizedCodeGeneration", "UseSmartTags", "UseSnapLines" }, childCollection.Properties.Sort().Cast<PropertyDescriptor>().Select(p => p.Name));
        Assert.Empty(childCollection);
    }

    [Fact]
    public void WindowsFormsDesignerOptionService_PopulateOptionCollection_ValidOptionsFromOtherClass_Success()
    {
        SubWindowsFormsDesignerOptionService service = new();
        SubWindowsFormsDesignerOptionService otherService = new();
        service.PopulateOptionCollectionEntry(otherService.Options);
        Assert.Equal(1, service.PopulateOptionCollectionCallCount);

        // Should retrieve again when accessing Options.
        DesignerOptionService.DesignerOptionCollection childCollection = Assert.IsType<DesignerOptionService.DesignerOptionCollection>(Assert.Single(service.Options));
        Assert.Equal(2, service.PopulateOptionCollectionCallCount);
        Assert.Equal("DesignerOptions", childCollection.Name);
        Assert.Same(service.Options, childCollection.Parent);
        Assert.Equal(new string[] { "EnableInSituEditing", "GridSize", "ObjectBoundSmartTagAutoShow", "ShowGrid", "SnapToGrid", "UseOptimizedCodeGeneration", "UseSmartTags", "UseSnapLines" }, childCollection.Properties.Sort().Cast<PropertyDescriptor>().Select(p => p.Name));
        Assert.Empty(childCollection);

        DesignerOptionService.DesignerOptionCollection otherChildCollection = Assert.IsType<DesignerOptionService.DesignerOptionCollection>(Assert.Single(service.Options));
        Assert.Equal(0, otherService.PopulateOptionCollectionCallCount);
        Assert.Equal("DesignerOptions", otherChildCollection.Name);
        Assert.Same(service.Options, otherChildCollection.Parent);
        Assert.Equal(new string[] { "EnableInSituEditing", "GridSize", "ObjectBoundSmartTagAutoShow", "ShowGrid", "SnapToGrid", "UseOptimizedCodeGeneration", "UseSmartTags", "UseSnapLines" }, childCollection.Properties.Sort().Cast<PropertyDescriptor>().Select(p => p.Name));
        Assert.Empty(otherChildCollection);
    }

    [Fact]
    public void WindowsFormsDesignerOptionService_PopulateOptionCollection_NullOptions_Success()
    {
        SubWindowsFormsDesignerOptionService service = new();
        service.PopulateOptionCollectionEntry(null);
        Assert.Equal(1, service.PopulateOptionCollectionCallCount);

        // Should retrieve again when accessing Options.
        DesignerOptionService.DesignerOptionCollection childCollection = Assert.IsType<DesignerOptionService.DesignerOptionCollection>(Assert.Single(service.Options));
        Assert.Equal(2, service.PopulateOptionCollectionCallCount);
        Assert.Equal("DesignerOptions", childCollection.Name);
        Assert.Same(service.Options, childCollection.Parent);
        Assert.Equal(new string[] { "EnableInSituEditing", "GridSize", "ObjectBoundSmartTagAutoShow", "ShowGrid", "SnapToGrid", "UseOptimizedCodeGeneration", "UseSmartTags", "UseSnapLines" }, childCollection.Properties.Sort().Cast<PropertyDescriptor>().Select(p => p.Name));
        Assert.Empty(childCollection);
        Assert.Equal(3, service.PopulateOptionCollectionCallCount);
    }

    private class SubWindowsFormsDesignerOptionService : WindowsFormsDesignerOptionService
    {
        public int PopulateOptionCollectionCallCount { get; set; }

        public void PopulateOptionCollectionEntry(DesignerOptionCollection options)
        {
            PopulateOptionCollection(options);
        }

        protected override void PopulateOptionCollection(DesignerOptionCollection options)
        {
            PopulateOptionCollectionCallCount++;
            base.PopulateOptionCollection(options);
        }
    }

    private class NullCompatibilityOptions : WindowsFormsDesignerOptionService
    {
        public override DesignerOptions CompatibilityOptions => null;
    }
}
