package script

import (
	"bufio"
	"context"
	"io"
	"os"
	"strings"
)

// StdinReader reads from stdin
type StdinReader struct {
	scanner bufio.Scanner
}

func NewStdinReader() *StdinReader {
	return &StdinReader{
		scanner: *bufio.NewScanner(os.Stdin),
	}
}

// Read reads from stdin until \n character
// then splits result at "," separator and returns
// the resulting slice.
// It returns EOF when nothing left to read.
func (s *StdinReader) Read(_ context.Context) ([]string, error) {
	if !s.scanner.Scan() {
		err := s.scanner.Err()
		if err == nil {
			return nil, io.EOF
		}

		return nil, err
	}

	return strings.Split(s.scanner.Text(), ","), nil
}