# Glue: where the store and one of its readers share a host, the reader waits
# for the store's container and requires `swarm-bao-pki`, which mints the leaf
# the reader logs in with.
#
# ONE PAIRING PER FILE — the store's container and PKI unit ← the readers that
# log in to it, and nothing else. The waits on the store's policy units are
# ./glue-bao-readers-policy-order.nix's.
#
# ⚠️ Gated on BOTH the store and that reader being here. Off the store's host
# neither unit exists, and `Requires=` on an absent unit fails the job, so
# there the reader's own start timeout bounds the attempt instead. On the
# store's host without the reader, setting `systemd.services.<reader>.after`
# would define a unit with no ExecStart, so each gate below restates the one
# the reader's own module puts on it. A reader whose gate changes must change
# here too.
{
  lib,
  config,
  ...
}:
let
  hyperhiveCfg = config.services.hyperhive;
  deployCfg = hyperhiveCfg.deploy;
  baoDeploy = deployCfg.bao;
  baoCfg = hyperhiveCfg.swarm.bao;
  otel = hyperhiveCfg.otel;

  havePair = cert: key: cert != null && key != null;

  # Reader unit → the gate its own module defines it under.
  readersHere = {
    # ./hive-forge/default.nix
    swarm-bao-forge-oidc = deployCfg.forgejo.enable;
    swarm-bao-forge-publisher = deployCfg.forgejo.enable;
    # ./hive-matrix.nix
    swarm-bao-matrix-oidc = deployCfg.matrix.enable;
    # ./otel.nix: `fetches`, the collector loading the file this unit writes
    # under the hive's own leaf.
    swarm-bao-hive-otel-oidc =
      otel.enable
      && hyperhiveCfg.hiveName != null
      && havePair baoDeploy.clientCertFile baoDeploy.clientKeyFile
      &&
        otel.clientSecretFile
        == "/var/lib/hive-otel-oidc/${hyperhiveCfg.swarm.authelia.hiveClientPrefix}${toString hyperhiveCfg.hiveName}.secret";
    # ./swarm-grafana.nix
    swarm-bao-grafana-oidc = deployCfg.grafana.enable;
    swarm-bao-grafana-admin = deployCfg.grafana.enable;
    swarm-bao-grafana-metrics-bearer = deployCfg.grafana.enable;
    # ./swarm-nats.nix
    swarm-bao-nats-callout-xkey = deployCfg.nats.enable;
    # ./swarm-ci-runner.nix
    swarm-bao-ci-runner = deployCfg.ci-runner.enable;
    # ./swarm-otel.nix
    swarm-bao-otel-oidc =
      deployCfg.swarm-otel.enable
      && havePair baoDeploy.otelOidcClientCertFile baoDeploy.otelOidcClientKeyFile;
  };

  orderAfterStore =
    reader: here:
    lib.mkIf (baoDeploy.enable && here) {
      systemd.services.${reader} = {
        after = [
          "swarm-bao-pki.service"
          "container@${baoCfg.machine}.service"
        ];
        wants = [ "container@${baoCfg.machine}.service" ];
        requires = [ "swarm-bao-pki.service" ];
      };
    };
in
{
  config = lib.mkMerge (lib.mapAttrsToList orderAfterStore readersHere);
}