package textfmt

import "strings"

func timesn(s string, n int) string {
	ss := make([]string, n+1)
	return strings.Join(ss, s)
}

func numDigits(n int) int {
	if n == 0 {
		return 1
	}

	var d int
	for n > 0 {
		d++
		n /= 10
	}

	return d
}

func maxLength(names []string) int {
	var m int
	for _, n := range names {
		if len([]rune(n)) > m {
			m = len([]rune(n))
		}
	}

	return m
}

func padRight(s string, n int) string {
	if len(s) >= n {
		return s
	}

	n -= len([]rune(s))
	return s + timesn(" ", n)
}

func singleLine(text string) string {
	var l []string
	p := strings.Split(text, "\n")
	for _, part := range p {
		part = strings.TrimSpace(part)
		if part == "" {
			continue
		}

		l = append(l, part)
	}

	return strings.Join(l, " ")
}

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

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

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