package textfmt

import (
	"io"
	"fmt"
	"strings"
)

type writer interface {
	write(...any)
	error() error
	setErr(error)
}

type ttyWriter struct {
	w   io.Writer
	internal bool
	err error
}

type roffWriter struct {
	w io.Writer
	internal bool
	err error
}

func (w *ttyWriter) write(a ...any) {
	for _, ai := range a {
		if w.err != nil {
			return
		}

		s := fmt.Sprint(ai)
		r := []rune(s)
		if !w.internal {
			for i := range r {
				if r[i] == '\u00a0' {
					r[i] = ' '
				}
			}
		}

		if _, err := w.w.Write([]byte(string(r))); err != nil {
			w.err = err
		}
	}
}

func (w *ttyWriter) error() error {
	return w.err
}

func (w *ttyWriter) setErr(err error) {
	w.err = err
}

func (w *roffWriter) write(a ...any) {
	for _, ai := range a {
		if w.err != nil {
			return
		}

		var rr []rune
		s := fmt.Sprint(ai)
		r := []rune(s)
		if w.internal {
			rr = r
		} else {
			for i := range r {
				if r[i] == '\u00a0' {
					rr = append(rr, []rune("\\~")...)
					continue
				}

				rr = append(rr, r[i])
			}
		}

		if _, err := w.w.Write([]byte(string(rr))); err != nil {
			w.err = err
		}
	}
}

func (w *roffWriter) error() error {
	return w.err
}

func (w *roffWriter) setErr(err error) {
	w.err = err
}

func writeLines(w writer, txt string, indentFirst, indentRest int) {
	lines := strings.Split(txt, "\n")
	for i, l := range lines {
		if i > 0 {
			w.write("\n")
		}

		indent := indentFirst
		if i > 0 {
			indent = indentRest
		}

		w.write(timesn(" ", indent))
		w.write(l)
	}
}