final: prev:
let
  lib = prev.lib;
in
{
  panoptikonReporters = (prev.panoptikonWatchers or { }) // {
    kpaste-irc =
      {
        target,
        retiolumLink ? false,
        server ? "irc.r",
        messagePrefix ? "change detected: ",
        nick ? ''"$PANOPTIKON_WATCHER"-watcher'',
      }:
      prev.writers.writeDash "kpaste-irc-reporter" ''
        KPASTE_CONTENT_TYPE=text/plain ${prev.kpaste}/bin/kpaste \
          | ${prev.gnused}/bin/sed -n "${if retiolumLink then "2" else "3"}s/^/${messagePrefix}/p" \
          | ${prev.nur.repos.mic92.ircsink}/bin/ircsink \
            --nick ${nick} \
            --server ${server} \
            --target ${target}
      '';
    irc =
      {
        target, # e.g., "#mychannel"
        server ? "irc.libera.chat",
        port ? "6667",
        nick ? "panoptikon-bot",
        messagePrefix ? "change detected: ",
      }:
      prev.writers.writeDash "irc-reporter" ''
        MESSAGE=$(cat | tr -d '\n\r')
        # Use netcat to send raw IRC commands
        (
          echo "NICK ${nick}"
          echo "USER ${nick} 8 * :Panoptikon Watcher"
          sleep 2 # Give the server a moment to process login
          echo "JOIN ${target}"
          echo "PRIVMSG ${target} :${messagePrefix} $MESSAGE"
          echo "QUIT"
        ) | ${prev.netcat}/bin/nc -w 10 ${server} ${port}
      '';
    telegram =
      {
        tokenPath, # Bot API Token
        chatId,
        messagePrefix ? "Change detected in $PANOPTIKON_WATCHER: ",
      }:
      prev.writers.writeDash "telegram-reporter" ''
        if [ ! -f "${tokenPath}" ]; then
          echo "Error: Token file ${tokenPath} not found" >&2
          exit 1
        fi
        TOKEN=$(cat "${tokenPath}")
        MESSAGE=$(cat)
        ${prev.curl}/bin/curl -s -X POST "https://api.telegram.org/bot''${TOKEN}/sendMessage" \
          -d chat_id="${chatId}" \
          -d text="${messagePrefix} $MESSAGE"
      '';
    matrix =
      {
        homeserver, # e.g., "https://matrix.org"
        roomId, # e.g., "!roomid:matrix.org"
        tokenPath,
        messagePrefix ? "Change detected in $PANOPTIKON_WATCHER: ",
      }:
      prev.writers.writeDash "matrix-reporter" ''
        if [ ! -f "${tokenPath}" ]; then
          echo "Error: Token file ${tokenPath} not found" >&2
          exit 1
        fi
        TOKEN=$(cat "${tokenPath}")
        MESSAGE=$(cat)
        TXN_ID=$(date +%s%N)
        ${prev.curl}/bin/curl -s -X PUT "${homeserver}/_matrix/client/r0/rooms/${lib.escapeShellArg roomId}/send/m.room.message/''${TXN_ID}?access_token=''${TOKEN}" \
          -H "Content-Type: application/json" \
          -d "{\"msgtype\": \"m.text\", \"body\": \"${messagePrefix} $MESSAGE\"}"
      '';
    wall =
      {
        messagePrefix ? "PANOPTIKON ALERT ($PANOPTIKON_WATCHER):",
      }:
      prev.writers.writeDash "wall-reporter" ''
        MESSAGE=$(cat)
        echo -e "${messagePrefix}\n$MESSAGE" | ${prev.util-linux}/bin/wall
      '';
    mail =
      {
        recipient, # e.g. "admin@example.com"
        subjectPrefix ? "[Panoptikon] Change detected:",
      }:
      prev.writers.writeDash "mail-reporter" ''
        MESSAGE=$(cat)
        echo "$MESSAGE" | ${prev.mailutils}/bin/mail -s "${subjectPrefix} $PANOPTIKON_WATCHER" "${recipient}"
      '';
  };
  panoptikonWatchers = (prev.panoptikonWatchers or { }) // {
    plain =
      address:
      prev.writers.writeDash "watch-url" ''
        ${prev.curl}/bin/curl -sSL ${lib.escapeShellArg address}
      '';
    html =
      address:
      prev.writers.writeDash "watch-html" ''
        ${prev.curl}/bin/curl -sSL ${lib.escapeShellArg address} \
          | ${prev.python3Packages.html2text}/bin/html2text --decode-errors=ignore
      '';
    htmlSelector =
      selector: address:
      prev.writers.writeDash "watch-html-selector" ''
        ${prev.curl}/bin/curl -sSL ${lib.escapeShellArg address} \
          | ${prev.htmlq}/bin/htmlq ${lib.escapeShellArg selector} \
          | ${prev.python3Packages.html2text}/bin/html2text
      '';
    json =
      {
        jqScript ? ".",
      }:
      address:
      prev.writers.writeDash "watch-json" ''
        ${prev.curl}/bin/curl -sSL ${lib.escapeShellArg address} | ${prev.jq}/bin/jq -f ${prev.writeText "script.jq" jqScript}
      '';
  };
}