package ui

type Context interface {
	Animate()
	Fonts() *Fonts
	HasQuit() bool
	Overlays() *Overlays
	Quit()
	Renderer() Renderer
	Style() *Style
	Textures() *Textures
}

var _ Context = &context{}
var _ EventTarget = &context{}

type context struct {
	animate  bool
	quit     chan struct{}
	renderer Renderer
	view     Control
	overlays *Overlays
	fonts    *Fonts
	textures *Textures
	style    *Style
}

func newContext(r Renderer, s *Style, view Control) *context {
	return &context{
		quit:     make(chan struct{}),
		renderer: r,
		style:    s,
		view:     view,
		overlays: NewOverlays(view),
		fonts:    NewFonts(r),
		textures: NewTextures(r)}
}

func (c *context) Animate() { c.animate = true }

func (c *context) Destroy() {
	c.fonts.Destroy()
	c.textures.Destroy()
}

func (c *context) Fonts() *Fonts { return c.fonts }

func (c *context) HasQuit() bool {
	select {
	case <-c.quit:
		return true
	default:
		return false
	}
}

func (c *context) Overlays() *Overlays { return c.overlays }

func (c *context) Renderer() Renderer { return c.renderer }

func (c *context) Style() *Style { return c.style }

func (c *context) Quit() {
	if !c.HasQuit() {
		close(c.quit)
	}
}

func (c *context) Textures() *Textures { return c.textures }

// Handle implement EventTarget

func (c *context) Handle(e Event) {
	switch e.(type) {
	case *DisplayCloseEvent:
		c.Quit()
		return
	}
	c.overlays.Handle(c, e)
}