const coral = @import("coral");

const kym = @import("kym");

const ona = @import("ona");

fn create_canvas_binding(binding_vm: *kym.Vm, canvas: *ona.gfx.Canvas) !*kym.Object {
	const canvas_object = try binding_vm.new(.{.native = canvas}, .{});
	const Object = kym.Object;
	const Value = kym.Value;

	try binding_vm.set_field(canvas_object, "create_sprite", .{.object = try binding_vm.new_closure(struct {
		fn call(calling_vm: *kym.Vm, _: *Object, context: *Object, arguments: []const Value) kym.RuntimeError!Value {
			const properties = try kym.object_argument(calling_vm, arguments, 0);

			@ptrCast(*ona.gfx.Canvas, context.userdata().native).create_sprite(.{
				.position = calling_vm.get_field(properties, "position").to_vector2() orelse coral.math.Vector2.zero,
				.rotation = @floatCast(f32, calling_vm.get_field(properties, "rotation").to_float() orelse 0.0),
			});

			return .nil;
		}
	}.call)});

	return canvas_object;
}

pub fn main() anyerror!void {
	return ona.App.run(anyerror, start);
}

fn start(app: *ona.App) anyerror!void {
	var vm = try kym.Vm.init(ona.allocator, .{
		.stack_max = 256,
		.objects_max = 512,
	});

	defer vm.deinit();

	try vm.set_field(vm.globals(), "events", .{.object = try create_canvas_binding(&vm, app.canvas())});

	{
		const index_path = "index.kym";
		const index_file = try app.data_fs().open_readable(index_path);

		defer if (!index_file.close()) ona.log_error(&.{.{.string = "failed to close "}, .{.string = index_path}});

		const index_size = (try app.data_fs().query(index_path)).size;
		const index_allocation = ona.allocator.allocate_many(u8, index_size) orelse return error.OutOfMemory;

		defer ona.allocator.deallocate(index_allocation);

		var index_buffer = coral.buffer.Fixed{.data = index_allocation[0 .. index_size]};

		{
			var stream_buffer = [_]u8{0} ** 1024;

			if ((try coral.io.stream(index_buffer.as_writer(), index_file.as_reader(), &stream_buffer)) != index_size)
				return error.IoUnavailable;
		}

		_ = try vm.call_self(try vm.new_script(index_buffer.data), &.{});
	}

	while (app.poll()) {

	}
}