{ pkgs, ... }:

{
  systemd.services.cal-alarms = {
    serviceConfig.Type = "simple";
    path = [
      pkgs.libnotify
      pkgs.dunstify
      pkgs.khal
    ];
    startAt = "*08:00:00";
    script = ''
      #!/usr/bin/env bash

      cache_file="${XDG_CACHE_HOME:-$HOME/.cache}/khal-events"
      # events starting in the next TIMESPAN will trigger an alarm
      timespan='60min'

      # this is needed for cronjobs and Xorg
      export DISPLAY=":0"
      snooze_string='💤 Snooze all.'
      dismiss_string='✅ Dismiss all.'
      # only show events with ⏰ symbol (=has alarm set)
      # remove arrows for all-day events to only have one notification
      # remove ⏰ symbol because it is obvious
      events="$(khal list --format \
        '{cancelled}{start-style}{to-style}{end-style} {title}{description-separator}{description}{location}{repeat-symbol}{alarm-symbol}' \
        now "${timespan}" \
        | sed -ne '/⏰/ p' \
        | sed -e 's/⏰//g' -e 's/\(↦\|↔\|⇥\)[^[:blank:]]*/all-day/g' \
        | column -tl 3)"

      # get events that are new compared to cache file
      new_events="$(diff -NwU 0 "${cache_file}" - << EOF | sed -ne '/^\+[^+]/ p' \
        | sed -ne 's/^\+\([[:print:]].*\)$/\1/p'
      ${events}
      EOF
      )"

      [ -z "${new_events}" ] && exit 0

      action="$(dunstify --action="default,Dismiss" --action="snooze,Snooze" "${new_events}")"

      case "${action}" in
        "snooze")
          ;;
        "default")
          printf '%s' "${events}" > "${cache_file}"
          ;;
        *)
          printf '%s' "${events}" | grep -Fve "${input}" > "${cache_file}"
          ;;
      esac
    '';
    serviceConfig = {
      User = "anish";
      Environment = "DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus";
    };
  };
  systemd.timers.cal-alarms = {
    wantedBy = [ "timers.target" ];
    partOf = [ "cal-alarms.service" ];
    timerConfig.OnCalendar = [ "*:0/10" ];
  };
}