using System;
using System.IO;
using System.Text.Json;

namespace MoonWorks.Graphics.Font.MSDF;

public class Font : IDisposable
{
	public Texture Texture { get; }
	internal AtlasData AtlasData;

	static JsonSerializerOptions SerializerOptions = new JsonSerializerOptions
	{
		PropertyNameCaseInsensitive = true,
		IncludeFields = true
	};
	static AtlasDataContext Context = new AtlasDataContext(SerializerOptions);

	private bool IsDisposed;

	public static Font Load(
		GraphicsDevice graphicsDevice,
		CommandBuffer commandBuffer,
		string jsonPath
	) {
		var atlasData = (AtlasData) JsonSerializer.Deserialize(File.ReadAllText(jsonPath), typeof(AtlasData), Context);
		var imagePath = Path.ChangeExtension(jsonPath, ".png");
		var texture = Texture.FromImageFile(graphicsDevice, commandBuffer, imagePath);

		return new Font(texture, atlasData);
	}

	private Font(Texture texture, AtlasData atlasData)
	{
		Texture = texture;
		AtlasData = atlasData;
	}

	protected virtual void Dispose(bool disposing)
	{
		if (!IsDisposed)
		{
			if (disposing)
			{
				Texture.Dispose();
			}

			IsDisposed = true;
		}
	}

	public void Dispose()
	{
		// Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
		Dispose(disposing: true);
		GC.SuppressFinalize(this);
	}
}