namespace Terminal.Gui.ViewsTests;

public class FlagSelectorTests
{
    [Fact]
    public void Initialization_ShouldSetDefaults ()
    {
        var flagSelector = new FlagSelector ();

        Assert.True (flagSelector.CanFocus);
        Assert.Equal (Dim.Auto (DimAutoStyle.Content), flagSelector.Width);
        Assert.Equal (Dim.Auto (DimAutoStyle.Content), flagSelector.Height);
        Assert.Equal (Orientation.Vertical, flagSelector.Orientation);
    }

    [Fact]
    public void SetFlags_WithDictionary_ShouldSetFlags ()
    {
        var flagSelector = new FlagSelector ();
        var flags = new Dictionary<uint, string>
        {
            { 1, "Flag1" },
            { 2, "Flag2" }
        };

        flagSelector.SetFlags (flags);

        Assert.Equal (flags, flagSelector.Flags);
    }

    [Fact]
    public void SetFlags_WithDictionary_ShouldSetValue ()
    {
        var flagSelector = new FlagSelector ();
        var flags = new Dictionary<uint, string>
        {
            { 1, "Flag1" },
            { 2, "Flag2" }
        };

        flagSelector.SetFlags (flags);

        Assert.Equal ((uint)1, flagSelector.Value);
    }

    [Fact]
    public void SetFlags_WithEnum_ShouldSetFlags ()
    {
        var flagSelector = new FlagSelector ();

        flagSelector.SetFlags<FlagSelectorStyles> ();

        var expectedFlags = Enum.GetValues<FlagSelectorStyles> ()
                                .ToDictionary (f => Convert.ToUInt32 (f), f => f.ToString ());

        Assert.Equal (expectedFlags, flagSelector.Flags);
    }

    [Fact]
    public void SetFlags_WithEnumAndCustomNames_ShouldSetFlags ()
    {
        var flagSelector = new FlagSelector ();

        flagSelector.SetFlags<FlagSelectorStyles> (f => f switch
        {
            FlagSelectorStyles.ShowNone => "Show None Value",
            FlagSelectorStyles.ShowValueEdit => "Show Value Editor",
            FlagSelectorStyles.All => "Everything",
            _ => f.ToString ()
        });

        var expectedFlags = Enum.GetValues<FlagSelectorStyles> ()
                                .ToDictionary (f => Convert.ToUInt32 (f), f => f switch
                                {
                                    FlagSelectorStyles.ShowNone => "Show None Value",
                                    FlagSelectorStyles.ShowValueEdit => "Show Value Editor",
                                    FlagSelectorStyles.All => "Everything",
                                    _ => f.ToString ()
                                });

        Assert.Equal (expectedFlags, flagSelector.Flags);
    }

    [Fact]
    public void Value_Set_ShouldUpdateCheckedState ()
    {
        var flagSelector = new FlagSelector ();
        var flags = new Dictionary<uint, string>
        {
            { 1, "Flag1" },
            { 2, "Flag2" }
        };

        flagSelector.SetFlags (flags);
        flagSelector.Value = 1;

        var checkBox = flagSelector.SubViews.OfType<CheckBox> ().First (cb => (uint)cb.Data == 1);
        Assert.Equal (CheckState.Checked, checkBox.CheckedState);

        checkBox = flagSelector.SubViews.OfType<CheckBox> ().First (cb => (uint)cb.Data == 2);
        Assert.Equal (CheckState.UnChecked, checkBox.CheckedState);
    }

    [Fact]
    public void Styles_Set_ShouldCreateSubViews ()
    {
        var flagSelector = new FlagSelector ();
        var flags = new Dictionary<uint, string>
        {
            { 1, "Flag1" },
            { 2, "Flag2" }
        };

        flagSelector.SetFlags (flags);
        flagSelector.Styles = FlagSelectorStyles.ShowNone;

        Assert.Contains (flagSelector.SubViews, sv => sv is CheckBox cb && cb.Title == "None");
    }

    [Fact]
    public void ValueChanged_Event_ShouldBeRaised ()
    {
        var flagSelector = new FlagSelector ();
        var flags = new Dictionary<uint, string>
        {
            { 1, "Flag1" },
            { 2, "Flag2" }
        };

        flagSelector.SetFlags (flags);
        bool eventRaised = false;
        flagSelector.ValueChanged += (sender, args) => eventRaised = true;

        flagSelector.Value = 2;

        Assert.True (eventRaised);
    }

    // Tests for FlagSelector<TEnum>
    [Fact]
    public void GenericInitialization_ShouldSetDefaults ()
    {
        var flagSelector = new FlagSelector<FlagSelectorStyles> ();

        Assert.True (flagSelector.CanFocus);
        Assert.Equal (Dim.Auto (DimAutoStyle.Content), flagSelector.Width);
        Assert.Equal (Dim.Auto (DimAutoStyle.Content), flagSelector.Height);
        Assert.Equal (Orientation.Vertical, flagSelector.Orientation);
    }

    [Fact]
    public void Generic_SetFlags_Methods_Throw ()
    {
        var flagSelector = new FlagSelector<FlagSelectorStyles> ();

        Assert.Throws<InvalidOperationException> (() => flagSelector.SetFlags (new Dictionary<uint, string> ()));
        Assert.Throws<InvalidOperationException> (() => flagSelector.SetFlags<FlagSelectorStyles> ());
        Assert.Throws<InvalidOperationException> (() => flagSelector.SetFlags<FlagSelectorStyles> (styles => null));
    }

    [Fact]
    public void GenericSetFlagNames_ShouldSetFlagNames ()
    {
        var flagSelector = new FlagSelector<FlagSelectorStyles> ();

        flagSelector.SetFlagNames (f => f switch
        {
            FlagSelectorStyles.ShowNone => "Show None Value",
            FlagSelectorStyles.ShowValueEdit => "Show Value Editor",
            FlagSelectorStyles.All => "Everything",
            _ => f.ToString ()
        });

        var expectedFlags = Enum.GetValues<FlagSelectorStyles> ()
                                .ToDictionary (f => Convert.ToUInt32 (f), f => f switch
                                {
                                    FlagSelectorStyles.ShowNone => "Show None Value",
                                    FlagSelectorStyles.ShowValueEdit => "Show Value Editor",
                                    FlagSelectorStyles.All => "Everything",
                                    _ => f.ToString ()
                                });

        Assert.Equal (expectedFlags, flagSelector.Flags);
    }

    [Fact]
    public void GenericValue_Set_ShouldUpdateCheckedState ()
    {
        var flagSelector = new FlagSelector<FlagSelectorStyles> ();

        flagSelector.SetFlagNames (f => f.ToString ());
        flagSelector.Value = FlagSelectorStyles.ShowNone;

        var checkBox = flagSelector.SubViews.OfType<CheckBox> ().First (cb => (uint)cb.Data == Convert.ToUInt32 (FlagSelectorStyles.ShowNone));
        Assert.Equal (CheckState.Checked, checkBox.CheckedState);

        checkBox = flagSelector.SubViews.OfType<CheckBox> ().First (cb => (uint)cb.Data == Convert.ToUInt32 (FlagSelectorStyles.ShowValueEdit));
        Assert.Equal (CheckState.UnChecked, checkBox.CheckedState);
    }

    [Fact]
    public void GenericValueChanged_Event_ShouldBeRaised ()
    {
        var flagSelector = new FlagSelector<FlagSelectorStyles> ();

        flagSelector.SetFlagNames (f => f.ToString ());
        bool eventRaised = false;
        flagSelector.ValueChanged += (sender, args) => eventRaised = true;

        flagSelector.Value = FlagSelectorStyles.ShowNone;

        Assert.True (eventRaised);
    }
}