package main

import (
	"strings"
)

// wrapLines returns a slice with every element representing a new line
func WrapLines(input string, maxLineLength int, breakupDelimiter string) []string {
	breakupDelimiterLength := len([]rune(breakupDelimiter))
	output := []string{}

	previousExistingLineIndex := -1
	for existingLineIndex, existingLine := range strings.Split(input, "\n") {
		words := strings.Split(existingLine, breakupDelimiter)
		length := 0
		for _, word := range words {
			wordLength := len([]rune(word))
			length += breakupDelimiterLength + wordLength
			if length > maxLineLength || len(output) == 0 || previousExistingLineIndex != existingLineIndex {
				output = append(output, word)
				length = wordLength
			} else {
				output[len(output) - 1] += breakupDelimiter + word
			}
			previousExistingLineIndex = existingLineIndex
		}
	}

	return output
}

func JoinGophermapLines(typeCharacter string, lines []string, lineEnding string) string {
	out := ""
	for index, line := range lines {
		out += typeCharacter + line + lineEnding
		if index < len(lines) - 1 { out += "\n" }
	}
	return out
}