package main

import (
	"flag"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"

	"github.com/peterbourgon/ff/v3"
)

func main() {
	fs := flag.NewFlagSet("gomodinit", flag.ExitOnError)
	base := fs.String("base", "", "Base URL prefix for module")
	if err := ff.Parse(fs, os.Args[1:], ff.WithEnvVarPrefix("GMI")); err != nil {
		fmt.Println(err)
		return
	}

	if *base == "" {
		fmt.Println("Base URL is required")
		return
	}

	dir, err := os.Getwd()
	if err != nil {
		fmt.Println(err)
		return
	}

	name := filepath.Base(dir)
	if fs.NArg() > 0 {
		name = fs.Arg(0)
	}

	*base = strings.TrimSuffix(*base, "/")

	out, err := exec.Command("go", "mod", "init", fmt.Sprintf("%s/%s", *base, name)).CombinedOutput()
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Print(string(out))
}