package cli

import (
	"bufio"
	"fmt"
	"os"
	"path/filepath"
	"strings"
)

func PromptWDefault(label, def string) string {
	ret := Prompt(label, false)
	if ret == "" {
		return def
	}
	return ret
}

func Prompt(label string, required bool) string {
	reader := bufio.NewReader(os.Stdin)
	var res string
	fmt.Println(label + ": ")
	res, _ = reader.ReadString('\n')
	res = strings.TrimSpace(res)
	if res == "" && required {
		fmt.Println("Non-empty response is required")
		return Prompt(label, required)
	}
	return res
}

func FileExists(path string) bool {
	info, err := os.Stat(path)
	if os.IsNotExist(err) {
		return false
	}
	return !info.IsDir()
}

func DirExists(path string) bool {
	info, err := os.Stat(path)
	if os.IsNotExist(err) {
		return false
	}
	return info.IsDir()
}

func ListFiles(path string) []string {
	var files []string
	err := filepath.Walk(path, func(p string, info os.FileInfo, err error) error {
		p = strings.TrimPrefix(p, path)
		if p != "" {
			files = append(files, strings.TrimPrefix(p, "/"))
		}
		return nil
	})
	if err != nil {
		return []string{}
	}
	return files
}

func PrintErr(o string) {
	fmt.Fprintln(os.Stderr, o)
}