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package main

import (
	"bytes"
	"errors"
	"flag"
	"fmt"
	"io/fs"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
)

var Version = "develop"

func main() {
	fs := flag.NewFlagSet("gomodinit", flag.ExitOnError)
	versionFlag := fs.Bool("version", false, "Print version and exit")
	if err := fs.Parse(os.Args[1:]); err != nil {
		fmt.Println(err)
		return
	}

	if *versionFlag {
		fmt.Printf("gomodinit %s\n", Version)
		return
	}

	var name string
	if fs.NArg() > 0 {
		name = fs.Arg(0)
	} else {
		n, err := module()
		if err != nil {
			fmt.Println(err)
			return
		}
		name = n
	}

	cmd := exec.Command("go", "mod", "init", name)
	cmd.Stdin = os.Stdin
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	_ = cmd.Run()
}

func module() (string, error) {
	dir, err := os.Getwd()
	if err != nil {
		return "", err
	}
	root := dir

	list := strings.Split(dir, string(filepath.Separator))
	name := list[len(list)-1]
	for idx := len(list) - 2; idx >= 0; idx-- {
		part := list[idx]
		name = fmt.Sprintf("%s/%s", part, name)
		root = filepath.Dir(root)
		if strings.Contains(part, ".") {
			break
		}
	}

	override, err := os.ReadFile(filepath.Join(root, ".gomodinit"))
	if errors.Is(err, fs.ErrNotExist) {
		return name, nil
	}
	if err != nil {
		return name, err
	}

	parts := strings.SplitN(name, "/", 2)

	return fmt.Sprintf("%s/%s", bytes.TrimSpace(override), parts[1]), nil
}