using System.Numerics;

namespace AcDream.App.UI;

/// <summary>
/// Retained presentation of retail's ECM_UI display-string notice emitted by
/// <c>gmSmartBoxUI::UseTime @ 0x004D6E30</c> while portal-space cell blocking
/// continues. It is a centered overlay, not a chat message.
/// </summary>
internal sealed class PortalWaitNoticeController : IDisposable
{
    private readonly UiRoot _root;
    private readonly UiText _text;
    private UiText.Line[] _lines = [];
    private bool _disposed;

    public PortalWaitNoticeController(UiRoot root)
    {
        _root = root ?? throw new ArgumentNullException(nameof(root));
        _text = new UiText
        {
            Name = "PortalSpaceWaitNotice",
            Left = 0f,
            Top = 0f,
            Width = root.Width,
            Height = root.Height,
            Anchors = AnchorEdges.Left
                | AnchorEdges.Top
                | AnchorEdges.Right
                | AnchorEdges.Bottom,
            Centered = true,
            OneLine = true,
            ClickThrough = true,
            ZOrder = int.MaxValue,
            DefaultColor = Vector4.One,
            Visible = false,
        };
        _text.LinesProvider = () => _lines;
        _root.AddChild(_text);
    }

    public void Set(string? message)
    {
        ObjectDisposedException.ThrowIf(_disposed, this);
        if (string.IsNullOrEmpty(message))
        {
            _text.Visible = false;
            _lines = [];
            return;
        }

        _lines = [new UiText.Line(message, Vector4.One)];
        _text.Visible = true;
    }

    public void Dispose()
    {
        if (_disposed)
            return;

        _root.RemoveChild(_text);
        _disposed = true;
    }
}