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#!/bin/bash

tmp_file=$(mktemp)
trap 'rm -f "${tmp_file}"' EXIT

printf '%s %s %s.\n' \
  'oratorienchor' 'Erich' '' \
  'thueringer-saengerknaben' 'Familie' 'K\&F: ' \
| while read -r Chor Kalender Extra; do
  curl -Ss 'https://kirchenmusik-saalfeld.de/termine-dienste/'"${Chor}"'/' \
  | grep '^\[{"@context":"http://schema\.org"' \
  | jq -cr '.[].url' \
  | while read -r url; do
    curl -Ss "${url%/}/?ical=1" \
    | sed '
      /^BEGIN:VTIMEZONE\s*$/,/^END:VTIMEZONE\s*$/ w'"${tmp_file}"'
      s@^SUMMARY:@\0'"${Extra%.}"'@
    ' \
    | khal import -a "${Kalender}" --batch
  done
done

{
  cat <<EOF
BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
EOF

  cat "${tmp_file}"

  curl -Ss 'https://kirchenmusik-saalfeld.de/termine-dienste/stimmbildung/' \
  | sed -n '
    /^<p><strong>/ {
      s@^\(<p><strong>[^<>]\+</strong>\)\(<br>[^<>]\+\)\(<br>\)@\1\2\n\1\3@
      P
      D
      p
    }
  ' \
  | sed '
    s@\bGerolf\b@Kasimir@g
  ' \
  | sed -n '
    s@^<p><strong>\S\+, @@
    T
    s/^.* \(Kasimir\|Friedrich\)/\1 \0/
    T
    s@</strong><br>@ @
    T
    s@ \&#8211; @ @g
    T
    s@ Uhr .*$@@
    T
    p
  ' \
  | sed "$(
    for m in {01..12}; do
      printf 's@\\b%s\\b@%s@\n' \
        "$(date -d "2022-${m}-01" '+%B')" \
        "${m}"
    done
  )"'
    s/://g
  ' \
  | while read -r wer tag monat von bis; do
    tag="${tag%.}"
    jahr=$(($(date '+%Y')-1))
    while [ $(($(date '+%s')-60*60*24*100)) -gt $(date -d "${jahr}-${monat}-${tag}" '+%s') ]; do
      jahr=$((jahr+1))
    done

    cat <<EOF
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:${jahr}${monat}${tag}T${von}00
DTEND;TZID=Europe/Berlin:${jahr}${monat}${tag}T${bis}00
DTSTAMP:$(date '+%+4Y%m%dT%H%M%S')
CREATED:$(date '+%+4Y%m%dT%H%M%S')
LAST-MODIFIED:$(date '+%+4Y%m%dT%H%M%S')
UID:$(echo "${wer} ${jahr} ${monat} ${tag} ${von} ${bis}" | sha256sum | awk '{print $1}')
SUMMARY:${wer:0:1}: Stimmbildung
LOCATION:Kantorat\, Kirchplatz 2\, Saalfeld\, 07318\, Deutschland
END:VEVENT
EOF

  done

  cat <<EOF
END:VCALENDAR
EOF

} \
| khal import -a "Familie" --batch