{ config, pkgs, ... }:

let
  serviceName = "backup-postgres";
in
{
  environment.systemPackages = [
    pkgs.restic
  ];

  systemd.timers."${serviceName}" = {
    wantedBy = [ "timers.target" ];
    timerConfig = {
      OnBootSec = "10m";
      OnUnitActiveSec = "10m";
      Unit = "${serviceName}.service";
    };
  };
  systemd.services."${serviceName}"= {
    script = ''
      set -euo pipefail

      cd /var/lib/hexname/postgres
      ${config.services.postgresql.package}/bin/pg_dumpall \
        --exclude-database=roundcube \
        --exclude-database=template0 \
        --exclude-database=template1 \
        --exclude-database=postgres \
        --clean \
        --file ./postgres.out
    '';
    wants = [ "restic-backups-postgres.service" ];
    serviceConfig = {
      Type = "oneshot";
      User = "postgres";
      Group = "postgres";
      RemainAfterExit = true; # Don't start the service on every rebuild
    };
  };

  # Overwrite the restic backup service so that it's triggered after `pg_dump`
  systemd.services.restic-backups-postgres = {
    after = [ "backup-postgres.service" ];
    # requires = [ "backup-postgres.service" ];
  };
}