namespace Sandbox.Transposer;

/// <summary>
/// Text renderer that uses font animation data to draw strings.
/// Each character is a named animation in the font sprite type (e.g. "a", "1", "+").
/// Supports scale, colour override with alpha, and newlines.
///
/// Original font is 6×9 pixels per glyph with 1px spacing.
/// </summary>
public class TextDisplay : Entity
{
	protected string _text;
	public string Text { set => _text = value; }

	protected Color _color;
	public Color TextColor { set => _color = value; }

	protected int _letterWidth;
	protected int _letterHeight;
	protected string _fontName;
	protected int _spacing = 1;
	protected int _scale;

	public TextDisplay( string text, TransposerScene scene, int x, int y, string fontName, Color color, int scale = 1 )
	{
		_text = text;
		_scene = scene;
		_fontName = fontName;
		_type = _fontName;
		_collideable = false;

		PixelPoint size = GetAnimSize( _type, "a" );
		_letterWidth = size.X;
		_letterHeight = size.Y;

		PixelX = x;
		PixelY = y;

		_color = color;
		SetOverriddenColor( _color );
		SetOverrideAlpha( true );

		_depth = Globals.DEPTH_TEXT;
		_scale = scale;
		_hitbox = new PixelRect( 0, 0, ((_letterWidth + 1) * text.Length - 1) * _scale, _letterHeight * _scale );
	}

	public override void Draw()
	{
		base.Draw();

		int currentX = PixelX;
		int currentY = PixelY;

		for ( int i = 0; i < _text.Length; i++ )
		{
			char c = _text[i];

			if ( c == '\n' )
			{
				currentY -= _letterHeight * _scale;
				currentX = PixelX;
				continue;
			}

			// Space — just advance without drawing.
			if ( c == ' ' )
			{
				currentX += (_letterWidth + _spacing) * _scale;
				continue;
			}

			List<PixelData> pixelDataList = GetPixelDataList( _fontName, c.ToString() );
			if ( pixelDataList is not null )
				DrawPixels( pixelDataList, currentX, currentY, _scale );

			currentX += (_letterWidth + _spacing) * _scale;
		}
	}
}