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

#nullable disable

using System.ComponentModel;
using System.Drawing;
using Point = System.Drawing.Point;
using Size = System.Drawing.Size;

namespace System.Windows.Forms.Tests;

public class FlowLayoutPanelTests
{
    [WinFormsFact]
    public void FlowLayoutPanel_Ctor_Default()
    {
        using SubFlowLayoutPanel control = new();
        Assert.Null(control.AccessibleDefaultActionDescription);
        Assert.Null(control.AccessibleDescription);
        Assert.Null(control.AccessibleName);
        Assert.Equal(AccessibleRole.Default, control.AccessibleRole);
        Assert.False(control.AllowDrop);
        Assert.Equal(AnchorStyles.Top | AnchorStyles.Left, control.Anchor);
        Assert.False(control.AutoScroll);
        Assert.Equal(Size.Empty, control.AutoScrollMargin);
        Assert.Equal(Size.Empty, control.AutoScrollMinSize);
        Assert.Equal(Point.Empty, control.AutoScrollPosition);
        Assert.False(control.AutoSize);
        Assert.Equal(AutoSizeMode.GrowOnly, control.AutoSizeMode);
        Assert.Equal(Control.DefaultBackColor, control.BackColor);
        Assert.Null(control.BackgroundImage);
        Assert.Equal(ImageLayout.Tile, control.BackgroundImageLayout);
        Assert.Null(control.BindingContext);
        Assert.Equal(BorderStyle.None, control.BorderStyle);
        Assert.Equal(100, control.Bottom);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.Bounds);
        Assert.True(control.CanEnableIme);
        Assert.False(control.CanFocus);
        Assert.True(control.CanRaiseEvents);
        Assert.False(control.CanSelect);
        Assert.False(control.Capture);
        Assert.True(control.CausesValidation);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.ClientRectangle);
        Assert.Equal(new Size(200, 100), control.ClientSize);
        Assert.False(control.Created);
        Assert.Null(control.Container);
        Assert.False(control.ContainsFocus);
        Assert.Null(control.ContextMenuStrip);
        Assert.Empty(control.Controls);
        Assert.Same(control.Controls, control.Controls);
        Assert.Same(Cursors.Default, control.Cursor);
        Assert.Same(Cursors.Default, control.DefaultCursor);
        Assert.Equal(ImeMode.Inherit, control.DefaultImeMode);
        Assert.Equal(new Padding(3), control.DefaultMargin);
        Assert.Equal(Size.Empty, control.DefaultMaximumSize);
        Assert.Equal(Size.Empty, control.DefaultMinimumSize);
        Assert.Equal(Padding.Empty, control.DefaultPadding);
        Assert.Equal(new Size(200, 100), control.DefaultSize);
        Assert.False(control.DesignMode);
        Assert.Equal(new Rectangle(0, 0, 200, 100), control.DisplayRectangle);
        Assert.Equal(DockStyle.None, control.Dock);
        Assert.NotNull(control.DockPadding);
        Assert.Same(control.DockPadding, control.DockPadding);
        Assert.Equal(0, control.DockPadding.Top);
        Assert.Equal(0, control.DockPadding.Bottom);
        Assert.Equal(0, control.DockPadding.Left);
        Assert.Equal(0, control.DockPadding.Right);
        Assert.False(control.DoubleBuffered);
        Assert.True(control.Enabled);
        Assert.NotNull(control.Events);
        Assert.Same(control.Events, control.Events);
        Assert.Equal(FlowDirection.LeftToRight, control.FlowDirection);
        Assert.False(control.Focused);
        Assert.Equal(Control.DefaultFont, control.Font);
        Assert.Equal(control.Font.Height, control.FontHeight);
        Assert.Equal(Control.DefaultForeColor, control.ForeColor);
        Assert.False(control.HasChildren);
        Assert.Equal(100, control.Height);
        Assert.NotNull(control.HorizontalScroll);
        Assert.Same(control.HorizontalScroll, control.HorizontalScroll);
        Assert.False(control.HScroll);
        Assert.Equal(ImeMode.NoControl, control.ImeMode);
        Assert.Equal(ImeMode.NoControl, control.ImeModeBase);
        Assert.False(control.IsAccessible);
        Assert.False(control.IsMirrored);
        Assert.NotNull(control.LayoutEngine);
        Assert.Same(control.LayoutEngine, control.LayoutEngine);
        Assert.Equal(0, control.Left);
        Assert.Equal(Point.Empty, control.Location);
        Assert.Equal(new Padding(3), control.Margin);
        Assert.Equal(Size.Empty, control.MaximumSize);
        Assert.Equal(Size.Empty, control.MinimumSize);
        Assert.Equal(Padding.Empty, control.Padding);
        Assert.Null(control.Parent);
        Assert.Equal(Size.Empty, control.PreferredSize);
        Assert.Equal("Microsoft\u00AE .NET", control.ProductName);
        Assert.False(control.RecreatingHandle);
        Assert.Null(control.Region);
        Assert.False(control.ResizeRedraw);
        Assert.Equal(200, control.Right);
        Assert.Equal(RightToLeft.No, control.RightToLeft);
        Assert.True(control.ShowFocusCues);
        Assert.True(control.ShowKeyboardCues);
        Assert.Null(control.Site);
        Assert.Equal(new Size(200, 100), control.Size);
        Assert.Equal(0, control.TabIndex);
        Assert.False(control.TabStop);
        Assert.Empty(control.Text);
        Assert.Equal(0, control.Top);
        Assert.Null(control.TopLevelControl);
        Assert.False(control.UseWaitCursor);
        Assert.NotNull(control.VerticalScroll);
        Assert.Same(control.VerticalScroll, control.VerticalScroll);
        Assert.True(control.Visible);
        Assert.False(control.VScroll);
        Assert.Equal(200, control.Width);
        Assert.True(control.WrapContents);

        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void FlowLayoutPanel_CreateParams_GetDefault_ReturnsExpected()
    {
        using SubFlowLayoutPanel control = new();
        CreateParams createParams = control.CreateParams;
        Assert.Null(createParams.Caption);
        Assert.Null(createParams.ClassName);
        Assert.Equal(0x8, createParams.ClassStyle);
        Assert.Equal(0x10000, createParams.ExStyle);
        Assert.Equal(100, createParams.Height);
        Assert.Equal(IntPtr.Zero, createParams.Parent);
        Assert.Null(createParams.Param);
        Assert.Equal(0x56000000, createParams.Style);
        Assert.Equal(200, createParams.Width);
        Assert.Equal(0, createParams.X);
        Assert.Equal(0, createParams.Y);
        Assert.Same(createParams, control.CreateParams);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [InlineData(FlowDirection.BottomUp, 1)]
    [InlineData(FlowDirection.LeftToRight, 1)]
    [InlineData(FlowDirection.RightToLeft, 1)]
    [InlineData(FlowDirection.TopDown, 1)]
    public void FlowLayoutPanel_FlowDirection_Set_GetReturnsExpected(FlowDirection value, int expectedLayoutCallCount)
    {
        using FlowLayoutPanel control = new();
        int layoutCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("FlowDirection", e.AffectedProperty);
            layoutCallCount++;
        };

        control.FlowDirection = value;
        Assert.Equal(value, control.FlowDirection);
        Assert.Equal(expectedLayoutCallCount, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Set same
        control.FlowDirection = value;
        Assert.Equal(value, control.FlowDirection);
        Assert.Equal(expectedLayoutCallCount * 2, layoutCallCount);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsTheory]
    [InvalidEnumData<FlowDirection>]
    public void FlowLayoutPanel_FlowDirection_SetInvalidValue_ThrowsInvalidEnumArgumentException(FlowDirection value)
    {
        using FlowLayoutPanel control = new();
        Assert.Throws<InvalidEnumArgumentException>("value", () => control.FlowDirection = value);
    }

    [WinFormsTheory]
    [InlineData(true, 1)]
    [InlineData(false, 1)]
    public void FlowLayoutPanel_WrapContents_Set_GetReturnsExpected(bool value, int expectedLayoutCallCount)
    {
        using FlowLayoutPanel control = new();
        int layoutCallCount = 0;
        control.Layout += (sender, e) =>
        {
            Assert.Same(control, sender);
            Assert.Same(control, e.AffectedControl);
            Assert.Equal("WrapContents", e.AffectedProperty);
            layoutCallCount++;
        };

        control.WrapContents = value;
        Assert.Equal(value, control.WrapContents);
        Assert.Equal(expectedLayoutCallCount, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Set same
        control.WrapContents = value;
        Assert.Equal(value, control.WrapContents);
        Assert.Equal(expectedLayoutCallCount + 1, layoutCallCount);
        Assert.False(control.IsHandleCreated);

        // Set different
        control.WrapContents = !value;
        Assert.Equal(!value, control.WrapContents);
        Assert.Equal(expectedLayoutCallCount + 1 + 1, layoutCallCount);
        Assert.False(control.IsHandleCreated);
    }

    [WinFormsFact]
    public void FlowLayoutPanel_CanExtend_InvokeWithParent_ReturnsTrue()
    {
        using FlowLayoutPanel control = new();
        using Control extendee = new()
        {
            Parent = control
        };
        IExtenderProvider extenderProvider = control;
        Assert.True(extenderProvider.CanExtend(extendee));
    }

    public static IEnumerable<object[]> CanExtend_TestData()
    {
        yield return new object[] { null };
        yield return new object[] { new() };
        yield return new object[] { new Control() };
        yield return new object[] { new Control { Parent = new() } };
    }

    [WinFormsTheory]
    [MemberData(nameof(CanExtend_TestData))]
    public void FlowLayoutPanel_CanExtend_InvokeNoParent_ReturnsFalse(object extendee)
    {
        using FlowLayoutPanel control = new();
        IExtenderProvider extenderProvider = control;
        Assert.False(extenderProvider.CanExtend(extendee));
    }

    [WinFormsFact]
    public void FlowLayoutPanel_GetAutoSizeMode_Invoke_ReturnsExpected()
    {
        using SubFlowLayoutPanel control = new();
        Assert.Equal(AutoSizeMode.GrowOnly, control.GetAutoSizeMode());
    }

    [WinFormsFact]
    public void FlowLayoutPanel_GetFlowBreak_InvokeValidControl_ReturnsExpected()
    {
        using Control child = new();
        using FlowLayoutPanel control = new();
        Assert.False(control.GetFlowBreak(child));
    }

    [WinFormsFact]
    public void FlowLayoutPanel_GetFlowBreak_NullControl_ThrowsArgumentNullException()
    {
        using FlowLayoutPanel control = new();
        Assert.Throws<ArgumentNullException>("control", () => control.GetFlowBreak(null));
    }

    [WinFormsTheory]
    [InlineData(0, true)]
    [InlineData(SubFlowLayoutPanel.ScrollStateAutoScrolling, false)]
    [InlineData(SubFlowLayoutPanel.ScrollStateFullDrag, false)]
    [InlineData(SubFlowLayoutPanel.ScrollStateHScrollVisible, false)]
    [InlineData(SubFlowLayoutPanel.ScrollStateUserHasScrolled, false)]
    [InlineData(SubFlowLayoutPanel.ScrollStateVScrollVisible, false)]
    [InlineData(int.MaxValue, false)]
    [InlineData((-1), false)]
    public void FlowLayoutPanel_GetScrollState_Invoke_ReturnsExpected(int bit, bool expected)
    {
        using SubFlowLayoutPanel control = new();
        Assert.Equal(expected, control.GetScrollState(bit));
    }

    [WinFormsTheory]
    [InlineData(ControlStyles.ContainerControl, true)]
    [InlineData(ControlStyles.UserPaint, true)]
    [InlineData(ControlStyles.Opaque, false)]
    [InlineData(ControlStyles.ResizeRedraw, false)]
    [InlineData(ControlStyles.FixedWidth, false)]
    [InlineData(ControlStyles.FixedHeight, false)]
    [InlineData(ControlStyles.StandardClick, true)]
    [InlineData(ControlStyles.Selectable, false)]
    [InlineData(ControlStyles.UserMouse, false)]
    [InlineData(ControlStyles.SupportsTransparentBackColor, true)]
    [InlineData(ControlStyles.StandardDoubleClick, true)]
    [InlineData(ControlStyles.AllPaintingInWmPaint, false)]
    [InlineData(ControlStyles.CacheText, false)]
    [InlineData(ControlStyles.EnableNotifyMessage, false)]
    [InlineData(ControlStyles.DoubleBuffer, false)]
    [InlineData(ControlStyles.OptimizedDoubleBuffer, false)]
    [InlineData(ControlStyles.UseTextForAccessibility, true)]
    [InlineData((ControlStyles)0, true)]
    [InlineData((ControlStyles)int.MaxValue, false)]
    [InlineData((ControlStyles)(-1), false)]
    public void FlowLayoutPanel_GetStyle_Invoke_ReturnsExpected(ControlStyles flag, bool expected)
    {
        using SubFlowLayoutPanel control = new();
        Assert.Equal(expected, control.GetStyle(flag));

        // Call again to test caching.
        Assert.Equal(expected, control.GetStyle(flag));
    }

    [WinFormsFact]
    public void FlowLayoutPanel_GetTopLevel_Invoke_ReturnsExpected()
    {
        using SubFlowLayoutPanel control = new();
        Assert.False(control.GetTopLevel());
    }

    [WinFormsTheory]
    [BoolData]
    public void FlowLayoutPanel_SetFlowBreak_Invoke_GetFlowBreakReturnsExpected(bool value)
    {
        using Control child = new();
        using FlowLayoutPanel control = new();
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;
        int childLayoutCallCount = 0;
        child.Layout += (sender, e) => childLayoutCallCount++;

        control.SetFlowBreak(child, value);
        Assert.Equal(value, control.GetFlowBreak(child));
        Assert.Equal(0, layoutCallCount);
        Assert.Equal(0, childLayoutCallCount);
        Assert.False(control.IsHandleCreated);
        Assert.False(child.IsHandleCreated);

        // Set same.
        control.SetFlowBreak(child, value);
        Assert.Equal(value, control.GetFlowBreak(child));
        Assert.Equal(0, layoutCallCount);
        Assert.Equal(0, childLayoutCallCount);
        Assert.False(control.IsHandleCreated);
        Assert.False(child.IsHandleCreated);

        // Set different.
        control.SetFlowBreak(child, !value);
        Assert.Equal(!value, control.GetFlowBreak(child));
        Assert.Equal(0, layoutCallCount);
        Assert.Equal(0, childLayoutCallCount);
        Assert.False(control.IsHandleCreated);
        Assert.False(child.IsHandleCreated);
    }

    [WinFormsTheory]
    [InlineData(true, 1)]
    [InlineData(false, 0)]
    public void FlowLayoutPanel_SetFlowBreak_InvokeControlWithParent_GetFlowBreakReturnsExpected(bool value, int expectedParentLayoutCallCount)
    {
        using Control parent = new();
        using Control child = new()
        {
            Parent = parent
        };
        using FlowLayoutPanel control = new();
        int layoutCallCount = 0;
        control.Layout += (sender, e) => layoutCallCount++;
        int childLayoutCallCount = 0;
        child.Layout += (sender, e) => childLayoutCallCount++;
        int parentLayoutCallCount = 0;
        void parentHandler(object sender, LayoutEventArgs eventArgs)
        {
            Assert.Same(parent, sender);
            Assert.Same(child, eventArgs.AffectedControl);
            Assert.Equal("FlowBreak", eventArgs.AffectedProperty);
            parentLayoutCallCount++;
        }

        parent.Layout += parentHandler;

        try
        {
            control.SetFlowBreak(child, value);
            Assert.Equal(value, control.GetFlowBreak(child));
            Assert.Equal(0, layoutCallCount);
            Assert.Equal(0, childLayoutCallCount);
            Assert.Equal(expectedParentLayoutCallCount, parentLayoutCallCount);
            Assert.False(control.IsHandleCreated);
            Assert.False(child.IsHandleCreated);
            Assert.False(parent.IsHandleCreated);

            // Set same.
            control.SetFlowBreak(child, value);
            Assert.Equal(value, control.GetFlowBreak(child));
            Assert.Equal(0, layoutCallCount);
            Assert.Equal(0, childLayoutCallCount);
            Assert.Equal(expectedParentLayoutCallCount, parentLayoutCallCount);
            Assert.False(control.IsHandleCreated);
            Assert.False(child.IsHandleCreated);
            Assert.False(parent.IsHandleCreated);

            // Set different.
            control.SetFlowBreak(child, !value);
            Assert.Equal(!value, control.GetFlowBreak(child));
            Assert.Equal(0, layoutCallCount);
            Assert.Equal(0, childLayoutCallCount);
            Assert.Equal(expectedParentLayoutCallCount + 1, parentLayoutCallCount);
            Assert.False(control.IsHandleCreated);
            Assert.False(child.IsHandleCreated);
            Assert.False(parent.IsHandleCreated);
        }
        finally
        {
            parent.Layout -= parentHandler;
        }
    }

    [WinFormsTheory]
    [BoolData]
    public void FlowLayoutPanel_SetFlowBreak_NullControl_ThrowsArgumentNullException(bool value)
    {
        using FlowLayoutPanel control = new();
        Assert.Throws<ArgumentNullException>("control", () => control.SetFlowBreak(null, value));
    }

    private class SubFlowLayoutPanel : FlowLayoutPanel
    {
        public new const int ScrollStateAutoScrolling = ScrollableControl.ScrollStateAutoScrolling;

        public new const int ScrollStateHScrollVisible = ScrollableControl.ScrollStateHScrollVisible;

        public new const int ScrollStateVScrollVisible = ScrollableControl.ScrollStateVScrollVisible;

        public new const int ScrollStateUserHasScrolled = ScrollableControl.ScrollStateUserHasScrolled;

        public new const int ScrollStateFullDrag = ScrollableControl.ScrollStateFullDrag;

        public new bool CanEnableIme => base.CanEnableIme;

        public new bool CanRaiseEvents => base.CanRaiseEvents;

        public new CreateParams CreateParams => base.CreateParams;

        public new Cursor DefaultCursor => base.DefaultCursor;

        public new ImeMode DefaultImeMode => base.DefaultImeMode;

        public new Padding DefaultMargin => base.DefaultMargin;

        public new Size DefaultMaximumSize => base.DefaultMaximumSize;

        public new Size DefaultMinimumSize => base.DefaultMinimumSize;

        public new Padding DefaultPadding => base.DefaultPadding;

        public new Size DefaultSize => base.DefaultSize;

        public new bool DesignMode => base.DesignMode;

        public new bool DoubleBuffered
        {
            get => base.DoubleBuffered;
            set => base.DoubleBuffered = value;
        }

        public new EventHandlerList Events => base.Events;

        public new int FontHeight
        {
            get => base.FontHeight;
            set => base.FontHeight = value;
        }

        public new ImeMode ImeModeBase
        {
            get => base.ImeModeBase;
            set => base.ImeModeBase = value;
        }

        public new bool HScroll
        {
            get => base.HScroll;
            set => base.HScroll = value;
        }

        public new bool ResizeRedraw
        {
            get => base.ResizeRedraw;
            set => base.ResizeRedraw = value;
        }

        public new bool ShowFocusCues => base.ShowFocusCues;

        public new bool ShowKeyboardCues => base.ShowKeyboardCues;

        public new bool VScroll
        {
            get => base.VScroll;
            set => base.VScroll = value;
        }

        public new AutoSizeMode GetAutoSizeMode() => base.GetAutoSizeMode();

        public new bool GetScrollState(int bit) => base.GetScrollState(bit);

        public new bool GetStyle(ControlStyles flag) => base.GetStyle(flag);

        public new bool GetTopLevel() => base.GetTopLevel();
    }
}
