using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;

using Engine.Core;
using Engine.Integration.MonoGame;

namespace Pong.Behaviours;

public class Label : Behaviour2D, IDrawableSprite, ILoadContent
{
    public ColorRGBA Color { get; set; } = new ColorRGBA(255, 255, 255, 255);

    public SpriteFont? Font
    {
        get => field;
        set
        {
            field = value;
            UpdateTextSize();
        }
    } = null;

    public string Text
    {
        get => field;
        set
        {
            field = value;
            UpdateTextSize();
        }
    } = string.Empty;

    private Vector2D textSize = Vector2D.Zero;

    public void LoadContent(ContentManager content)
    {
        Font ??= content.Load<SpriteFont>("UbuntuMono");
    }

    public void Draw(ISpriteBatch spriteBatch)
    {
        if (Font is null)
            return;

        spriteBatch.DrawString(Font, Text, Transform.Position, Color.ToPreMultipliedColor(), Transform.Rotation, textSize * .5f, Transform.Scale.Magnitude, SpriteEffects.FlipVertically, 0f);
    }

    private void UpdateTextSize()
    {
        if (Font is not null)
            textSize = Font.MeasureString(Text).ToVector2D();
    }

    public Label() { }
    public Label(SpriteFont font) => Font = font;
}