package ascii_reduce

func getMapping(r rune) []rune {
	if replacement, ok := Mappings[r]; ok {
		return []rune(replacement)
	} else {
		return []rune("")
	}
}

func Reduce(s string, replace_non_ascii_char string) string {
	runes := []rune(s)

	isAllAscii := true
	for _, r := range runes {
		if r > 0x7e {
			isAllAscii = false
			break
		}
	}

	if isAllAscii {
		return s
	}

	newRunes := make([]rune, 0)

	for _, sourceRune := range runes {
		mapped := getMapping(sourceRune)
		for _, replacedRune := range mapped {
			if replacedRune > 0x7e {
				replacedRune = []rune(replace_non_ascii_char)[0]
			}

			newRunes = append(newRunes, replacedRune)
		}
	}

	return string(newRunes)
}