using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Theriapolis.Game.CodexUI.Core;

namespace Theriapolis.Game.CodexUI.Widgets;

/// <summary>
/// Single-child container that paints a parchment fill and a 1-px ink rule
/// border. The review-step summary blocks and the aside container both use
/// this; for borderless wrappers (e.g. the page's main column) just nest in
/// a <see cref="Column"/> instead.
/// </summary>
public sealed class CodexPanel : CodexWidget
{
    public CodexWidget? Child { get; set; }
    public Color BackgroundColor { get; set; } = CodexColors.Bg2;
    public Color BorderColor { get; set; } = CodexColors.Rule;
    public bool Bordered { get; set; } = true;
    public Thickness Inset { get; set; } = new(18, 18, 20, 18);

    private readonly CodexAtlas _atlas;

    public CodexPanel(CodexAtlas atlas, CodexWidget? child = null)
    {
        _atlas = atlas;
        Child = child;
        if (child is not null) child.Parent = this;
    }

    protected override Point MeasureCore(Point available)
    {
        if (Child is null) return new Point(Inset.HorizontalSum(), Inset.VerticalSum());
        var inner = new Point(available.X - Inset.HorizontalSum(), available.Y - Inset.VerticalSum());
        var s = Child.Measure(inner);
        return new Point(s.X + Inset.HorizontalSum(), s.Y + Inset.VerticalSum());
    }

    protected override void ArrangeCore(Rectangle bounds)
    {
        Child?.Arrange(new Rectangle(
            bounds.X + Inset.Left,
            bounds.Y + Inset.Top,
            bounds.Width - Inset.HorizontalSum(),
            bounds.Height - Inset.VerticalSum()));
    }

    public override void Update(GameTime gt, CodexInput input) => Child?.Update(gt, input);

    public override void Draw(SpriteBatch sb, GameTime gt)
    {
        sb.Draw(_atlas.Pixel, Bounds, BackgroundColor);
        if (Bordered)
        {
            sb.Draw(_atlas.Pixel, new Rectangle(Bounds.X, Bounds.Y, Bounds.Width, 1), BorderColor);
            sb.Draw(_atlas.Pixel, new Rectangle(Bounds.X, Bounds.Bottom - 1, Bounds.Width, 1), BorderColor);
            sb.Draw(_atlas.Pixel, new Rectangle(Bounds.X, Bounds.Y, 1, Bounds.Height), BorderColor);
            sb.Draw(_atlas.Pixel, new Rectangle(Bounds.Right - 1, Bounds.Y, 1, Bounds.Height), BorderColor);
        }
        Child?.Draw(sb, gt);
    }
}