# What a host decides about the swarm's secret publisher: whether it runs, and
# the store identity it presents, plus the list of secrets it copies. The unit
# itself is ../container-modules/swarm-secret-publisher.nix, inside authelia's
# container beside the mint whose secrets it copies; ./swarm-authelia.nix
# imports it there and hands the identity in as system credentials.
{
  lib,
  config,
  ...
}:
let
  hyperhiveCfg = config.services.hyperhive;
  hiveNames = lib.attrNames hyperhiveCfg.swarm.hives;

  # The client id agent containers present, per hive — composed exactly as
  # ./swarm-authelia.nix composes it, from the same two read-only options, so a
  # rename there cannot leave this spelling behind.
  agentClientId =
    hive:
    "${hyperhiveCfg.swarm.authelia.hiveClientPrefix}${hive}${hyperhiveCfg.swarm.authelia.agentClientSuffix}";

  # The hive's own client id, which hive-c0re publishes the hive's status with.
  # Composed as ./swarm-authelia.nix composes it, for the reason above.
  hiveClientId = hive: "${hyperhiveCfg.swarm.authelia.hiveClientPrefix}${hive}";

  # The swarm's own services, as opposed to its hives. One client for the whole
  # swarm rather than one per hive, so one value in the store rather than a copy
  # each: `swarm/services/<id>/oidc/client`.
  #
  # The ids come from `swarm.*`, which is identical on every host — that is what
  # lets this host name a service's client while running none of them, and it is
  # the same read each service's own module registers its client with. A swarm
  # that runs no Grafana, or no collector, mints no secret for the one it lacks,
  # so its entry skips below rather than needing a condition here.
  serviceClientIds = [
    hyperhiveCfg.swarm.grafana.oidc.clientId
    hyperhiveCfg.swarm.otel.clientId
    # The secret store's own journal forwarder. A third swarm service by this
    # list's own rule — a client registered once for the whole swarm, whose
    # secret one host mints and another reads — even though the principal
    # behind it runs inside the store's container rather than beside it.
    # Missing from here, authelia mints the value and nothing carries it, so
    # the reader waits on a path that is never written.
    hyperhiveCfg.swarm.bao.otel.clientId
    # The store's browser UI, whose `oidc` auth method the store's host
    # configures with this secret.
    hyperhiveCfg.swarm.bao.ui.oidc.clientId
    # The queue's auth-callout responder, which reads it itself on the
    # queue's host.
    hyperhiveCfg.swarm.nats.clientId
    # The homeserver, read by `swarm-bao-matrix-oidc` on its host.
    hyperhiveCfg.swarm.matrix.sso.clientId
    # The forge's login source, read by `swarm-bao-forge-oidc` on its host.
    hyperhiveCfg.swarm.forge.sso.clientId
    # The review classifier, which reads it itself inside its container.
    hyperhiveCfg.swarm.review-classifier.clientId
    # The swarm builder, which reads it itself inside its container.
    hyperhiveCfg.swarm.builder.clientId
    # The claude login minter, which reads it itself inside its container.
    hyperhiveCfg.swarm.claude-login.clientId
    # The journal forwarders in the CI runner's, Grafana's, the log store's,
    # the forge's and the homeserver's containers, each reading it inside its
    # container.
    hyperhiveCfg.swarm.ci-runner.otel.clientId
    hyperhiveCfg.swarm.grafana.otel.clientId
    hyperhiveCfg.swarm.victorialogs.otel.clientId
    hyperhiveCfg.swarm.forge.otel.clientId
    hyperhiveCfg.swarm.matrix.otel.clientId
    # The metrics store container's journal forwarder, whose host reads it.
    hyperhiveCfg.swarm.victoriametrics.otel.clientId
    # The CI run poller, which reads it itself on its host.
    hyperhiveCfg.swarm.ci-metrics.clientId
    # Authelia's container's journal forwarder, which reads it back under the
    # publisher's own identity.
    hyperhiveCfg.swarm.authelia.otel.clientId
  ];

  # The swarm controller's OIDC client, which it reads back from the store
  # under its own certificate.
  controllerClientId = hyperhiveCfg.swarm.controller.queueClientId;
  controllerSecretPath = "secret/swarm/controller/swarm-controller/oidc/client";

  secrets =
    # `client_id` beside the value: an agent's id is derived per hive and has
    # to be reconstructable from the store alone.
    map (hive: {
      clientId = agentClientId hive;
      path = "secret/swarm/hives/${hive}/queue/agent";
      withClientId = true;
    }) hiveNames
    # Each hive's own client, which that hive's hive-c0re reads under its own
    # certificate. The nix half of
    # `swarm_secret_client::queue::hive_client_path`.
    ++ map (hive: {
      clientId = hiveClientId hive;
      path = "secret/swarm/hives/${hive}/oidc/client";
    }) hiveNames
    # No `client_id`: a service's client id is the swarm-wide option both
    # ends already read.
    ++ map (id: {
      clientId = id;
      path = "secret/swarm/services/${id}/oidc/client";
    }) serviceClientIds
    # Under `controller/`, which no hive reads: this client may read every
    # hive's status. The nix half of
    # `swarm_secret_client::queue::controller_client_path`.
    ++ [
      {
        clientId = controllerClientId;
        path = controllerSecretPath;
      }
    ];
in
{
  options.services.hyperhive.deploy.swarm-secret-publisher = {
    enable = lib.mkOption {
      type = lib.types.bool;
      default = false;
      description = ''
        Publish the OIDC client secrets this host mints into the swarm's
        secret store, so a hive that does not run authelia can read its
        own and its agents' credentials and a swarm service or the
        controller can read its own — from wherever it runs, this host
        included. The unit, `swarm-secret-publish`, runs inside authelia's
        container, so it exists only where authelia runs.

        Defaults to whether this host mints the OIDC secrets (set by
        `glue-secret-publisher-authelia.nix`), which is the only half of the
        question that is a property of *this* host.

        ⚠️ Deliberately **not** `deploy.bao.enable`. That asks whether the
        store stands here, and a publisher beside a remote store, holding a
        leaf issued out of band, is a deployment this exists to serve —
        defaulting on co-location would leave exactly that shape silently
        publishing nothing. Whether the wiring is complete is the client
        identity's job (see `baoClientCertFile`), not this option's.

        Turning it off leaves every hive but this one without its agents'
        credential, every hive unable to publish its status, the swarm
        controller unable to start, the swarm's Grafana without any login at
        all, its collector pushing unauthenticated, the queue's responder
        unable to start, the homeserver unable to start, and the forge's login
        source without its secret.
        Each secret has exactly one route and this is the producer's
        end of it, so the honest reason to set it false is a deployment
        delivering those secrets by some other mechanism it owns.
      '';
    };

    baoClientCertFile = lib.mkOption {
      type = lib.types.nullOr lib.types.str;
      default = null;
      description = ''
        Client certificate this publisher presents to the store. Its subject
        must be {option}`services.hyperhive.deploy.bao.secretPublisherCommonName`
        — cert auth matches on the CN, and the role accepts nothing else.

        A path on the host. ./swarm-authelia.nix hands it into authelia's
        container as an nspawn system credential, and nspawn refuses to
        start the container while a credential's source is missing: set,
        the file has to exist before authelia's container starts.

        No default: a module that guessed would be holding the CA opinion
        ./swarm-bao.nix deliberately does not hold.
        ./glue-secret-publisher-bao-identity.nix points it at the leaf
        ./glue-bao-tls.nix mints, where this host mints one.
      '';
    };

    baoClientKeyFile = lib.mkOption {
      type = lib.types.nullOr lib.types.str;
      default = null;
      description = ''
        Private key for {option}`services.hyperhive.deploy.swarm-secret-publisher.baoClientCertFile`.
        Both or neither — the unit does not exist unless each is set. A host
        path, handed in like the certificate.
      '';
    };

    secrets = lib.mkOption {
      type = lib.types.listOf lib.types.attrs;
      readOnly = true;
      internal = true;
      default = secrets;
      description = ''
        Every secret the publisher copies: the minted client's id, the store
        path its reader fetches, and whether `client_id` is stored beside the
        value. Derived from `swarm.*` alone, so it is the same list on every
        host; ./swarm-authelia.nix hands it to the unit in its container.
      '';
    };
  };
}