//
// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

package main

import (
	"regexp"

	"github.com/mattn/go-runewidth"
)

var skinTones = "\U0001F3FB\U0001F3FC\U0001F3FD\U0001F3FE\U0001F3FF"
var re_moredumb = regexp.MustCompile("[\U0001f44f\U0001f6a8\U000026a0][" + skinTones + "\ufe0f]*")

func demoji(s string) string {
	s = re_moredumb.ReplaceAllString(s, ".")

	zw := false
	for _, c := range s {
		if c == '\n' {
			continue
		}
		if c > 127 && runewidth.RuneWidth(c) == 0 {
			zw = true
			break
		}
	}
	if zw {
		x := make([]byte, 0, len(s))
		zw = false
		for _, c := range s {
			if c > 127 && runewidth.RuneWidth(c) == 0 {
				if zw {
					continue
				}
				zw = true
			} else {
				zw = false
			}
			q := string(c)
			x = append(x, []byte(q)...)
		}
		return string(x)
	}
	return s
}
