package main

import (
	"fmt"
	"os"
	"runtime"

	log "github.com/Sirupsen/logrus"
)

func runUsage() {
	fmt.Printf("USAGE: %s run [backend] [options] [prefix]\n\n", os.Args[0])

	fmt.Printf("'backend' specifies the run backend.\n")
	fmt.Printf("If not specified the platform specific default will be used\n")
	fmt.Printf("Supported backends are (default platform in brackets):\n")
	fmt.Printf("  hyperkit [macOS]\n")
	fmt.Printf("\n")
	fmt.Printf("'options' are the backend specific options.\n")
	fmt.Printf("See 'moby run [backend] --help' for details.\n\n")
	fmt.Printf("'prefix' specifies the path to the VM image.\n")
	fmt.Printf("It defaults to './moby'.\n")
}

func run(args []string) {
	if len(args) < 1 {
		runUsage()
		os.Exit(1)
	}

	switch args[0] {
	case "help", "-h", "-help", "--help":
		runUsage()
		os.Exit(0)
	case "hyperkit":
		runHyperKit(args[1:])
	default:
		switch runtime.GOOS {
		case "darwin":
			runHyperKit(args)
		default:
			log.Errorf("There currently is no default 'run' backend for your platform.")
		}
	}
}