package ui

import (
	"errors"

	"opslag.de/schobers/geom"
)

// RendererFactory can be used to inject a new factory for creating renderers.
type RendererFactory interface {
	New(title string, width, height int, opts NewRendererOptions) (Renderer, error)
}

var rendererFactory RendererFactory

// NewRenderer creates a new renderer based on the registered renderer factory.
func NewRenderer(title string, width, height int, opts NewRendererOptions) (Renderer, error) {
	if rendererFactory == nil {
		return nil, errors.New("no renderer factory registered")
	}
	return rendererFactory.New(title, width, height, opts)
}

// NewRendererDefault creates a new renderer with default options set based on the registered renderer factory.
func NewRendererDefault(title string, width, height int) (Renderer, error) {
	return rendererFactory.New(title, width, height, NewRendererOptions{
		Resizable: true,
	})
}

// SetRendererFactory sets the new factory that is used to create a new renderer.
func SetRendererFactory(factory RendererFactory) {
	rendererFactory = factory
}

// NewRendererOptions provides options when creating a new renderer.
type NewRendererOptions struct {
	Location  *geom.PointF32
	Resizable bool
	VSync     bool
}