{ config, lib, pkgs, ... }:

with lib;
with types;
let
  cfg = config.services.taskwarrior-pushover;
  name = "taskwarrior-pushover";
in
{
  options.services.taskwarrior-pushover = {
    enable = mkEnableOption "taskwarrior pushover notification service";
    onCalendar = mkOption {
      type = str;
      default = "4:00:00";
    };
    pushoverApiTokenFile = mkOption {
      type = path;
    };
    pushoverUserKeyFile = mkOption {
      type = path;
    };
    query = mkOption {
      type = str;
      default = "+PENDING and ( +ACTIVE or +DUETODAY or +TODAY or +OVERDUE )";
    };
    dataDir = mkOption {
      type = str;
      default = "tasks";
    };
    caFile = mkOption {
      type = path;
    };
    certificateFile = mkOption {
      type = path;
    };
    credentials= mkOption {
      type = str;
    };
    keyFile = mkOption {
      type = path;
    };
    server = mkOption {
      type = str;
    };
  };

  config = mkIf cfg.enable {
    systemd.services.taskwarrior-pushover = {
      enable = true;
      serviceConfig = {
        DynamicUser = true;
        StateDirectory = name;
      };
      script = let
        taskwarriorCommand = pkgs.writers.writeDash "taskwarrior-push" ''
         ${pkgs.taskwarrior}/bin/task \
            rc.recurrence=off  \
            rc:/var/lib/${name}/.taskrc \
            rc.data.location=/var/lib/${name}/${cfg.dataDir} \
            rc.taskd.ca=${cfg.caFile} \
            rc.taskd.certificate=${cfg.certificateFile} \
            rc.taskd.credentials="${cfg.credentials}" \
            rc.taskd.key=${cfg.keyFile} \
            rc.taskd.server=${cfg.server} \
            "$@"
        '';
      in
        ''
        if [ -d /var/lib/${name}/${cfg.dataDir} ]
        then
          echo "synchronize {cfg.dataDir}"
          ${taskwarriorCommand} sync
        else
          echo "initialize ${cfg.dataDir}"
          ${pkgs.coreutils}/bin/yes | ${taskwarriorCommand} sync init
        fi

        ${taskwarriorCommand} '${cfg.query}' export \
        | ${pkgs.jq}/bin/jq -r '.[] | @base64' | while read entry
        do
         echo $entry | base64 --decode | \
           ${pkgs.jq}/bin/jq '{
             "token": "'`cat ${cfg.pushoverApiTokenFile}`'",
             "user": "'`cat ${cfg.pushoverUserKeyFile}`'",
             "titel": "taskwarrior",
             message: .description
           }' \
           | ${pkgs.curl}/bin/curl -sS -X POST -H 'Content-Type: application/json' -d @- \
           "https://api.pushover.net/1/messages.json"
        done
        '';
    };
    systemd.timers.taskwarrior-pushover = {
      enable = true;
      timerConfig.OnCalendar = cfg.onCalendar;
      wantedBy = [ "multi-user.target" ];
    };
  };

}