package textfmt

import (
	"fmt"
	"unicode"
)

type indent struct {
	out                 writer
	firstIndent, indent int
	firstWidth, width   int
	currentLineLength   int
	currentWord         []rune
	multiline           bool
}

func (i *indent) write(a ...any) {
	for _, ai := range a {
		s := fmt.Sprint(ai)
		r := []rune(s)
		for _, ri := range r {
			width := i.width
			if !i.multiline {
				width = i.firstWidth
			}

			indent := i.indent
			if !i.multiline {
				indent = i.firstIndent
			}

			if !unicode.IsSpace(ri) || ri == '\u00a0' {
				i.currentWord = append(i.currentWord, ri)
				continue
			}

			nonWrapNewline := width == 0 && ri == '\n'
			if len(i.currentWord) == 0 && !nonWrapNewline {
				continue
			}

			nextLineLength := i.currentLineLength + len(i.currentWord) + 1
			if i.currentLineLength > 0 && width > 0 && nextLineLength > width {
				i.out.write("\n")
				i.currentLineLength = 0
				i.multiline = true
			}

			if i.currentLineLength > 0 && len(i.currentWord) > 0 {
				i.out.write(" ")
				i.currentLineLength++
			}

			if i.currentLineLength == 0 && len(i.currentWord) > 0 {
				i.out.write(timesn(" ", indent))
				i.currentLineLength += indent
			}

			if len(i.currentWord) > 0 {
				i.out.write(string(i.currentWord))
				i.currentLineLength += len(i.currentWord)
				i.currentWord = nil
			}

			if nonWrapNewline {
				i.out.write("\n")
				i.currentLineLength = 0
			}
		}
	}
}

func (i *indent) flush() {
	i.out.flush()
}

func (i *indent) error() error {
	return i.out.error()
}

func (e *indent) setErr(err error) {
}