func TestExample(t *testing.T) {
	style1 := NewStyle().
		FlexGrow(2).
		Border(blockBorder, true).
		SetString("content 1")

	style2 := NewStyle().
		FlexGrow(1).
		Border(doubleBorder, true).
		SetString("content 2")

	fmt.Println(Flexbox(80, 40, style1, style2))
}

// Flexbox requires to have used Style.SetString beforehand.
func Flexbox(width, height int, styles ...Style) string {
	if len(styles) == 0 {
		return ""
	}
	if len(styles) == 1 {
		return styles[0].String()
	}

	// crazy flexbox voodoo, botched example with flex-grow:
	var totalGrow int
	for _, style := range styles {
		totalGrow += style.GetFlexGrow()
	}
	for _, style := range styles {
		style.Width(width * style.GetFlexGrow() / totalGrow)
	}

	var rendered []string
	for _, style := range styles {
		rendered = append(rendered, style.String())
	}

	// we would not actually use that:
	return JoinHorizontal(Bottom, rendered...)
}

const (
	flexGrowKey = iota + strikethroughSpacesKey + 1
)

func (s Style) FlexGrow(i int) Style {
	if i < 0 {
		panic("negative flex grow")
	}
	s.set(flexGrowKey, i)
	return s
}

func (s Style) GetFlexGrow() int {
	return s.getAsInt(flexGrowKey)
}