package ui

import (
	"flag"

	"github.com/faiface/pixel"
	"github.com/faiface/pixel/pixelgl"
)

var (
	winX = flag.Int("win-x", 1280, "width of the view-map window")
	winY = flag.Int("win-y", 1024, "height of the view-map window")
)

type Window struct {
	PixelWindow         *pixelgl.Window
	ButtonEventHandlers map[pixelgl.Button][]func()
}

// WARE! 0,0 is the *bottom left* of the window
//
// To invert things so 0,0 is the *top left*, apply the InvertY` matrix
func NewWindow(title string) (*Window, error) {
	cfg := pixelgl.WindowConfig{
		Title:  title,
		Bounds: pixel.R(0, 0, float64(*winX), float64(*winY)),
		VSync:  true,
	}

	pixelWindow, err := pixelgl.NewWindow(cfg)
	if err != nil {
		return nil, err
	}

	return &Window{
		PixelWindow: pixelWindow,
	}, nil
}

// TODO: a stop or other cancellation mechanism
func (w *Window) Run(f func()) {
	for !w.PixelWindow.Closed() {
		f()
		w.PixelWindow.Update()
	}
}