niveum/configs/telegram-bots/tlg-wotd.nix

{
  pkgs,
  lib,
  config,
  ...
}: {
  systemd.services.telegram-bot-tlg-wotd = {
    enable = true;
    wantedBy = ["multi-user.target"];
    wants = ["network-online.target"];
    startAt = "9:30";
    path = [ pkgs.jq pkgs.curl pkgs.recode pkgs.deno pkgs.imagemagick pkgs.gawk pkgs.gnugrep pkgs.coreutils ];
    environment = {
      NPM_CONFIG_CACHE = "/tmp";
      DENO_DIR = "/tmp";
    };
    script = ''
      set -efux

      chat_id=@tlgwotd

      export TOKEN="$(cat "$CREDENTIALS_DIRECTORY/token")"

      json_data=$(curl -sSL http://stephanus.tlg.uci.edu/Iris/Wotd | recode html..utf8)

      word=$(echo "$json_data" | jq -r '.word')
      compact_word=$(echo "$word" | sed 's/,.*$//')
      definition=$(echo "$json_data" | jq -r '.definition | sub("<.*>"; "") | rtrimstr(" ")')
      first_occurrence=$(echo "$json_data" | jq -r '.firstOccurrence')
      total_occurrences=$(echo "$json_data" | jq -r '.totalOccurrences')

      transliteration=$(deno run ${pkgs.writeText "translit.ts" ''
        import grc from "npm:greek-transliteration";
        console.log(grc.transliterate(Deno.args.join(" ")));
      ''} "$compact_word")


      photo_path=/tmp/output.png

      hex_to_rgb() {
          hex="$1"
          r=$(printf "%d" "0x$(echo "$hex" | cut -c2-3)")
          g=$(printf "%d" "0x$(echo "$hex" | cut -c4-5)")
          b=$(printf "%d" "0x$(echo "$hex" | cut -c6-7)")
          echo "$r $g $b"
      }

      calculate_luminance() {
          r="$1"
          g="$2"
          b="$3"

          r_l=$(echo "$r" | awk '{print ($1 / 255 <= 0.03928) ? $1 / 255 / 12.92 : (($1 / 255 + 0.055) / 1.055)^2.4}')
          g_l=$(echo "$g" | awk '{print ($1 / 255 <= 0.03928) ? $1 / 255 / 12.92 : (($1 / 255 + 0.055) / 1.055)^2.4}')
          b_l=$(echo "$b" | awk '{print ($1 / 255 <= 0.03928) ? $1 / 255 / 12.92 : (($1 / 255 + 0.055) / 1.055)^2.4}')

          echo "$r_l $g_l $b_l" | awk '{print 0.2126*$1 + 0.7152*$2 + 0.0722*$3}'
      }


      hex_color="#$(echo "$compact_word" | md5sum | cut -c 1-6)"
      if echo "$hex_color" | grep -qE '^#[0-9A-Fa-f]{6}$'; then
          set -- $(hex_to_rgb "$hex_color")
          r="$1"
          g="$2"
          b="$3"
      fi

    luminance=$(calculate_luminance "$r" "$g" "$b")

    threshold="0.1"
    echo "$r $g $b"
    if [ "$(echo "$luminance" | awk -v threshold="$threshold" '{print ($1 > threshold)}')" -eq 1 ]; then
        color1="black"
        color2="#333"
    else
        color1="white"
        color2=lightgrey
    fi

    magick -size 1400x846 \
        xc:"$hex_color" \
        -font "${pkgs.gentium}/share/fonts/truetype/GentiumBookPlus-Bold.ttf" \
        -fill "$color1" \
        -pointsize 150 -gravity west \
        -annotate +100-160 "$compact_word" \
        -font "${pkgs.gentium}/share/fonts/truetype/GentiumBookPlus-Regular.ttf" \
        -fill "$color2" \
        -pointsize 60 -gravity west \
        -annotate +100+00 "/$transliteration/" \
        -fill "$color1" \
        -annotate +100+100 "‘$definition’" \
        -fill "$color2" \
        -pointsize 40 -gravity southwest \
        -annotate +100+60 "t.me/TLGWotD" \
        -pointsize 40 -gravity southeast \
        -annotate +100+60 "$(date -I)" \
        "$photo_path"

    ls -la /tmp

    curl -X POST "https://api.telegram.org/bot$TOKEN/sendPhoto" \
         -F "chat_id=\"$chat_id\"" \
         -F "photo=@$photo_path" \
         -F parse_mode=Markdown \
         -F caption="*$word* ‘$definition’

    First occurrence (century): $first_occurrence
    Number of occurrences (in all Ancient Greek texts): $total_occurrences"
    '';
    serviceConfig = {
      Type = "oneshot";
      DynamicUser = true;
      StateDirectory = "tlgwotd";
      PrivateTmp = true;
      LoadCredential = "token:${config.age.secrets.telegram-token-kmein.path}";
    };
  };

  niveum.passport.services = [
    {
      title = "Thesaurus Linguae Graecae Word of the Day";
      description = "sends <a href=\"https://stephanus.tlg.uci.edu/\">TLG</a>'s word of the day to Telegram.";
      link = "https://t.me/tlgwotd";
    }
  ];
}