package app

import (
	"flag"
	"os"
)

type Config struct {
	WindowWidth  int
	WindowHeight int
	Fullscreen   bool
}

func ParseConfig() Config {
	cfg := Config{
		WindowWidth:  1280,
		WindowHeight: 720,
		Fullscreen:   envBool("KIDSKEYBOARD_FULLSCREEN"),
	}

	flag.IntVar(&cfg.WindowWidth, "width", cfg.WindowWidth, "window width")
	flag.IntVar(&cfg.WindowHeight, "height", cfg.WindowHeight, "window height")
	flag.BoolVar(&cfg.Fullscreen, "fullscreen", cfg.Fullscreen, "start in fullscreen mode")
	flag.Bool("windowed", false, "force windowed mode")
	flag.Parse()

	if flag.Lookup("windowed") != nil {
		if v := flag.Lookup("windowed").Value.String(); v == "true" {
			cfg.Fullscreen = false
		}
	}

	return cfg
}

func envBool(name string) bool {
	switch os.Getenv(name) {
	case "1", "true", "TRUE", "yes", "YES", "on", "ON":
		return true
	default:
		return false
	}
}