package utio

import (
	"bufio"
	"fmt"
	"io"
)

type Liner struct {
	Lines []string
}

// Lines creates a coder that encodes/decodes the lines of a text file.
func Lines() *Liner {
	return &Liner{}
}

func (l *Liner) Encode(w io.Writer) error {
	for _, line := range l.Lines {
		if _, err := fmt.Fprintln(w, line); err != nil {
			return err
		}
	}
	return nil
}

func (l *Liner) Decode(r io.Reader) error {
	scanner := bufio.NewScanner(r)
	for scanner.Scan() {
		l.Lines = append(l.Lines, scanner.Text())
	}
	return scanner.Err()
}

// ReadLines reads a text file and splits in lines.
func ReadLines(path string) ([]string, error) {
	var l = Lines()
	var err = DecodeFile(path, l)
	if nil != err {
		return nil, err
	}
	return l.Lines, nil
}

// WriteLines writes lines to a text file.
func WriteLines(path string, lines []string) error {
	return EncodeFile(path, &Liner{lines})
}