#!/usr/bin/env bash

exec {sock}<>/dev/tcp/irc.libera.chat/6667

while IFS= read -ru "$sock" line; do
  line=${line%$'\r'}
  declare -A msg=( [words]=no [original]="$line" )

  if [[ ${line:0:1} = : ]]; then
    prefix=${line%% *} line=${line#"$prefix"} line=${line# } prefix=${prefix#:}
    msg[host]=${prefix#*@} prefix=${prefix%"${msg[host]}"} prefix=${prefix%@}
    msg[from]=${msg[host]}

    if [[ $prefix ]]; then
      msg[ident]=${prefix#*!}
      msg[from]=${msg[ident]}

      if [[ ${msg[ident]} != "$prefix" ]]; then
        msg[nick]=${prefix%!*}
        msg[from]=${msg[nick]}
      fi
    fi
  fi

  msg[cmd]=${line%% *} msg[cmd]=${msg[cmd]^^}
  line=${line#"${msg[cmd]}"} line=${line# }
  msg_args=( )

  while [[ $line ]]; do
    if [[ ${line:0:1} = : ]]; then
      msg_args+=( "${line:1}" ) msg[words]=yes line=
      read -ra msg_words <<< "${msg_args[-1]}"
    else
      arg=${line%% *} msg_args+=( "$arg" )
      line=${line#"$arg"} line=${line# }
    fi
  done

  if [[ ${msg[cmd]} = @(PRIVMSG|NOTICE) ]]; then
    if [[ ${msg_args[0]:0:1} = \# ]]; then
      msg[to]=${msg_args[0]}
    else
      msg[to]=${msg[from]}
    fi
  fi

  printf '%s\n' "${msg[original]}"
done