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#!/bin/sh

# answer to stuff on irc

# shellcheck disable=SC2119,SC2120

# shellcheck source=../lib/load-configuration
. "${0%/*}/../lib/load-configuration"

# welcome devs (in #archlinux32 only)
welcome_user_regex='^\S\+ -!- \(abaumann\|buildmaster\|deep42thought\|girls\|nit-picker\|tyzoid\)(.* has joined \S\+$'
new_users=$(
  sed -i '
    s/'"${welcome_user_regex}"'/\1/
    T
    w /dev/stdout
    d
  ' "${irc_dir}/#archlinux32/out" | \
    sort -u
)
if [ -n "${new_users}" ]; then
  printf '%s\n' "${new_users}" | \
    sed '
      s/^.*$/Hi \0!\n!rq \0/
      s/Hi buildmaster!\n//
    ' | \
    irc_say '' 'copy'
fi

find "${irc_dir}" \
  -type f \
  -name 'out' \
  -printf '%p\n' | \
  while read -r out_file; do
    channel="${out_file%/out}"
    channel="${channel##*/}"
    if [ -z "${channel%%#*}" ]; then
      prefix='buildmaster: '
      sloppy_salutation='^\S\+\s\+\S\+\s.*buildmaster'
    else
      prefix=''
      sloppy_salutation=''
    fi
    # answer "why don't you?"
    regex='^\S\+ <\(\S\+\)> '"${prefix}"'!\?why[- ]don'"'"'\?t[- ]you \(build\|stabilize\|unstage\|keep\|stubbornly_keep\) '
    if grep -q "${regex}" "${out_file}"; then
      sed -i '
        s/'"${regex}"'/\1 \2 /
        T
        w /dev/stdout
        d
      ' "${out_file}" | \
        while read -r asker line; do
          reason=$(
            echo "${line}" | \
              xargs "${base_dir}/bin/why-dont-you" 2>&1 | \
              sed '
                1 s/^/'"${asker}"': /
              '
          )
          if [ "$(echo "${reason}" | wc -l)" -le 5 ]; then
            echo "${reason}"
          else
            echo "${reason}" | \
              head -n5
            printf '... (%s lines total)\n' "$(echo "${reason}" | wc -l)"
          fi | \
            irc_say "${channel}" 'copy'
        done
    fi
    # answer "wtf?"
    regex='^\S\+ <\(\S\+\)> '"${prefix}"'!\?wtf '
    if grep -q "${regex}" "${out_file}"; then
      sed -i '
        s/'"${regex}"'/\1 /
        T
        w /dev/stdout
        d
      ' "${out_file}" | \
        while read -r asker line; do
          reason=$("${base_dir}/bin/wtf" "${line}");
          if [ -z "${reason}" ]; then
            reason="Huh, I don't know that one."
          fi
          reason="${asker}: ${reason}"
          if [ "$(echo "${reason}" | wc -l)" -le 5 ]; then
            echo "${reason}"
          else
            echo "${reason}" | \
              head -n5
            printf '... (%s lines total)\n' "$(echo "${reason}" | wc -l)"
          fi | \
            irc_say "${channel}" 'copy'
        done
    fi
    # answer "wtp?"
    regex='^\S\+ <\(\S\+\)> '"${prefix}"'!\?wtp '
    if grep -q "${regex}" "${out_file}"; then
      sed -i '
        s/'"${regex}"'/\1 /
        T
        w /dev/stdout
        d
      ' "${out_file}" | \
        while read -r asker line; do
          reason=$("${base_dir}/bin/wtp" "${line}");
          if [ -z "${reason}" ]; then
            reason="No, we don't have that."
          fi
          reason="${asker}: ${reason}"
          if [ "$(echo "${reason}" | wc -l)" -le 5 ]; then
            echo "${reason}"
          else
            echo "${reason}" | \
              head -n5
            printf '... (%s lines total)\n' "$(echo "${reason}" | wc -l)"
          fi | \
            irc_say "${channel}" 'copy'
        done
    fi
    # answer "What's up?"
    regex='^\S\+ <\S\+> .*[Ww]hat'"'"'\?s *[Uu]p'
    if grep "${regex}" "${out_file}" | \
      grep -q "${sloppy_salutation}"; then
      sed -i "/${regex}/d" "${out_file}"
      {
        printf 'up? I'"'"'m up for %s, %s' \
          "$(uptime -p | sed 's/^up //')" \
          "$(uptime | sed 's/.*,  //')"
        if [ -s "${work_dir}/build-master-sanity" ]; then
          printf ' ... and I'"'"'m insane :-D'
        fi
        printf '\n'
      } | \
        irc_say "${channel}" 'copy'
    fi
    # answer "Thanks!"
    regex='^\S\+ <\(\S\+\)> \(.* \)\?[Tt]h\(anks\|x\)\([ ,.!].*\)\?$'
    if grep "${regex}" "${out_file}" | \
      grep -q "${sloppy_salutation}"; then
      sed -i '
        /'"${sloppy_salutation}"'/ s/'"${regex}"'/np, \1/
        T
        w /dev/stdout
        d
      ' "${out_file}" | \
        sort -u | \
        irc_say "${channel}" 'copy'
    fi
    # answer "say/tell ... new/random/more"
    regex='^\S\+ <\(\S\+\)> \(.* \)\?\([Ss]ay\|[Tt]ell\).*\(new\|random\|more\).*'
    if grep "${regex}" "${out_file}" | \
      grep -q "${sloppy_salutation}"; then
      askers=$(
        sed -i '
          /'"${sloppy_salutation}"'/ s/'"${regex}"'/\1/
          T
          w /dev/stdout
          d
        ' "${out_file}" | \
          sort -u
      )
      if [ -n "${askers}" ]; then
        # markov's source is there: https://git.eckner.net/Erich/markov
        # its parameters are: a word list, the depth of the markov chain
        # and the count of words to print
        "${base_dir}/bin/markov" ~/.words.irc 3 "$(printf '%s\n' "${askers}" | wc -l)" | \
          for asker in ${askers}; do
            if ! read -r random; then
              continue
            fi
            printf '%s: %s\n' "${asker}" "${random}"
          done | \
          irc_say "${channel}" 'copy'
      fi
    fi
    if [ -z "${channel%%#*}" ]; then
      # answer "Shut up!"
      regex='^\S\+ <\S\+> \(.* \)\?[Ss][Hh][Uu][Tt] \?[Uu][Pp]'
      if grep "${regex}" "${out_file}" | \
        grep -q "${sloppy_salutation}"; then
        sed -i "/${regex}/d" "${out_file}"
        printf 'Sorry, I will do.\n' | \
          irc_say "${channel}" 'copy'
        printf '%s\n' "$((
          $(date '+%s') + 3600
        ))" > "${work_dir}/irc-shut-up"
      fi
    fi
  done