package ui

import (
	"time"

	"opslag.de/schobers/geom"
)

// Run runs the application loop.
func Run(r Renderer, s *Style, view Control) error {
	return RunWait(r, s, view, false)
}

// RunWait runs the application loop and conditionally waits on events before rendering.
func RunWait(r Renderer, s *Style, view Control, wait bool) error {
	if s == nil {
		s = DefaultStyle()
	}
	ctx := newContext(r, s, view)
	defer ctx.Destroy()

	root, ok := view.(RootControl)
	if ok {
		err := root.Init(ctx)
		if err != nil {
			return err
		}
	}

	dragDropTarget := &dragDropEventTarget{renderer: r}
	dragDrop := DefaultDragDropProvider
	if dragDrop != nil {
		dragDrop.Register(r.WindowHandle(), dragDropTarget)
	}

	anim := time.NewTicker(30 * time.Millisecond)
	go func() {
		for {
			select {
			case <-anim.C:
			case <-ctx.quit:
				return
			}
			if ctx.animate {
				r.Refresh()
			}
			ctx.animate = false
		}
	}()
	defer anim.Stop()

	overlays := ctx.Overlays()
	ctx.Renderer().Refresh()
	for !ctx.HasQuit() {
		var size = r.Size()
		var bounds = geom.RectF32(0, 0, float32(size.X), float32(size.Y))
		overlays.Arrange(ctx, bounds, geom.ZeroPtF32, nil)
		overlays.Render(ctx)
		if ctx.HasQuit() {
			return nil
		}

		tooltip := ctx.tooltip.Text
		ctx.tooltip.Text = ""
		if r.PushEvents(ctx, wait) {
			if ctx.tooltip.Text != tooltip {
				ctx.overlays.SetVisibility(uiDefaultTooltipOverlay, ctx.tooltip.Text != "")
			}
		} else {
			ctx.tooltip.Text = tooltip
		}

		dragDropEvents := dragDropTarget.events
		dragDropTarget.events = nil
		for _, e := range dragDropEvents {
			ctx.Handle(e)
		}
	}
	return nil
}