# Environment of the hive-c0re daemon unit — a plain function file
# (not a module) returning the env attrset, imported by ./default.nix.
# Everything meta.rs forwards into agent containers or reads for the
# meta-flake render is assembled here.
{
  lib,
  config,
  pkgs,
}:
let
  cfg = config.services.hyperhive.c0re;
in
{
  # nix (the prebuild `nix build`, flake-check, and meta eval) writes
  # its fetcher/eval cache under $HOME/.cache. As a system user
  # hive-core has no home, so HOME defaults to the unwritable
  # /var/empty and Lix fails to initialise its cache. Point HOME at
  # the writable StateDirectory.
  HOME = "/var/lib/hyperhive";
  HYPERHIVE_GIT = "${pkgs.git}/bin/git";
  # Never let git block on an interactive credential prompt. hive-core is a
  # TTY-less system user, so a prompt (e.g. the forge credential helper
  # returns nothing because the forge isn't reachable yet on cold boot)
  # would hang forever — this is what froze the whole daemon during startup
  # migration's `nix flake lock` of the forge-hosted config inputs. With
  # this set, git fails fast instead of prompting. Paired with the git http
  # low-speed abort in `safeDirGitconfig` (bounds a stalled transfer) and
  # the 120s migration shellout timeout in migrate.rs.
  GIT_TERMINAL_PROMPT = "0";
  # No HIVE_STATIC_DIR: the gateway static-serves the dashboard dist
  # (see the hive-gateway module); this router is API-only.
  # Path to the base agent frontend dist. hive-c0re's
  # gateway_nginx.rs uses this to generate split location
  # blocks in agents.conf — static HTML/CSS/JS served from the
  # nix store directly; dynamic API paths still proxied to the
  # agent daemon. nginx runs on the host, which is where this
  # store path already is, so it is reachable as written.
  HIVE_AGENT_FRONTEND_DIR = "${cfg.servedFrontend}/agent";
  # Path to the static runtime asset tree (branding + claude
  # prompts). `hive_sh4re::assets::*` reads paths underneath.
  # `forge/users.rs` reads the core avatar PNG from here on startup.
  HIVE_ASSETS_DIR = "${cfg.assets}/share/hyperhive";
  # `agent-configs` org avatar PNG — independently overridable via
  # `orgAvatarPng` without replacing the whole `assets` package.
  # Falls back to the bundled PNG under HIVE_ASSETS_DIR when unset.
  # Read by `forge::users::config_org_avatar_png_path`.
  HIVE_ORG_AVATAR_PNG =
    if cfg.orgAvatarPng != null then
      "${cfg.orgAvatarPng}"
    else
      "${cfg.assets}/share/hyperhive/branding/agent-configs.png";
  # Whether this hive runs ruthless — no root/manager agent at all
  # (`auto_update::ensure_root_agent`). Default false = root
  # auto-managed; true makes the sweep a no-op.
  HYPERHIVE_RUTHLESS = lib.boolToString config.services.hyperhive.ruthless;
}
// {
  # Identity env vars threaded into c0re's own service env and
  # forwarded by meta.rs into every sub-agent's harness env —
  # full chain in docs/conventions.md::Hive identity. `domain` is
  # required (asserted in hive-network.nix), so it's always set.
  HYPERHIVE_HIVE_DOMAIN = config.services.hyperhive.domain;
}
// lib.optionalAttrs (config.services.hyperhive.hiveName != null) {
  HYPERHIVE_HIVE_NAME = config.services.hyperhive.hiveName;
}
// lib.optionalAttrs (config.services.hyperhive.swarm.name != null) {
  HYPERHIVE_SWARM_NAME = config.services.hyperhive.swarm.name;
}
// lib.optionalAttrs (!config.services.hyperhive.github.enable) {
  # GitHub integration is on by default; only signal the OFF override to
  # meta.rs, which then injects `hyperhive.github.enable = false` into
  # every agent. See services.hyperhive.github.enable.
  HYPERHIVE_GITHUB_DISABLED = "1";
}
// lib.optionalAttrs config.services.hyperhive.otel.enable (
  # Hive-wide OTEL config -> read by meta.rs::otel_config and
  # injected as build-time `hyperhive.otel.*` into every agent.
  # Endpoint presence is the enable signal on the meta side; the
  # optional fields are only emitted when set so absent values
  # don't render no-op env lines.
  let
    otel = config.services.hyperhive.otel;
  in
  {
    # `otel.endpoint` means "where telemetry ultimately goes" and keeps
    # that meaning; what agents are handed is the *first hop*, which is
    # always this hive's own collector. Deriving it rather than
    # redefining `endpoint` is what lets every existing deployment keep
    # its configured value untouched.
    HYPERHIVE_OTEL_ENDPOINT = "http://${config.services.hyperhive.network.bridgeIp}:${toString otel.collector.port}";
    # The first hop is the collector's OTLP/HTTP receiver, which speaks
    # protobuf regardless of what the upstream wants — `otel.protocol`
    # describes the *upstream* link, and the collector's own exporter is
    # what has to honour it (see nix/host-modules/otel.nix).
    HYPERHIVE_OTEL_PROTOCOL = "http/protobuf";
  }
  // lib.optionalAttrs (otel.extraResourceAttributes != "") {
    HYPERHIVE_OTEL_EXTRA_RESOURCE_ATTRIBUTES = otel.extraResourceAttributes;
  }
  # HYPERHIVE_OTEL_HEADERS_CREDENTIAL is deliberately NOT emitted, and
  # its absence is the security half of this design. It is the variable
  # that put the upstream token in an agent's own settings.json:
  # host_config.rs forwards it into the container as an nspawn
  # credential, and claude-settings.nix's `hive-otel-header` oneshot
  # then writes the value into a file the agent can read. The collector
  # holding the credential achieves nothing while the harness keeps
  # handing out a copy — so there is exactly one holder, on the host.
  // lib.optionalAttrs (otel.metricIntervalMs != null) {
    HYPERHIVE_OTEL_METRIC_INTERVAL_MS = toString otel.metricIntervalMs;
  }
  // lib.optionalAttrs otel.debug {
    HYPERHIVE_OTEL_DEBUG = "1";
  }
)
// {
  # In-cluster forge URL — the gateway vhost (`forge.<domain>`), which
  # nginx proxies to forgejo. Used both for internal API calls in
  # hive-c0re (forge/mod.rs `forge_http_base()`) and forwarded to
  # agents via meta.rs for their forge-notify client. The forge is
  # mandatory, so this is unconditional (the whole env block is already
  # gated on hyperhive being enabled). See `docs/gateway.md::HIVE_FORGE_URL`.
  HIVE_FORGE_URL = "http://${config.services.hyperhive.swarm.forge.domain}";
}
//
  lib.optionalAttrs
    (
      config.services.hyperhive.swarm.matrix.enable
      && config.services.hyperhive.swarm.matrix.gatewayHost != null
    )
    {
      # In-cluster matrix homeserver URL for each agent's
      # hive-matrix-daemon — the gateway vhost (`matrix.<domain>`).
      # Forwarded to agents by meta.rs alongside HIVE_FORGE_URL; shares the
      # same env-forwarding ordering caveat (value baked at
      # config-generation time).
      #
      # A domain-less config forwards nothing rather than falling back to
      # loopback. The old fallback read as harmless because hive-c0re shares
      # the host netns — but the value it produced was handed to *agents*,
      # which do not, so `127.0.0.1` there names the agent itself. An absent
      # forward leaves `hyperhive.matrix.url` null and the daemon no-ops;
      # that is the honest answer when the hive has no matrix vhost to point
      # at.
      HIVE_MATRIX_URL = "http://${config.services.hyperhive.swarm.matrix.gatewayHost}";
    }
// lib.optionalAttrs (config.services.hyperhive.swarm.matrix.apiUrl != null) {
  # Client-server API base hive-c0re uses to provision matrix (register
  # agent users, create the hive space + chat room, invite members).
  # Supplied by `services.hyperhive.swarm.matrix.apiUrl`, which the matrix
  # module fills in with its own loopback listener when it is the thing
  # running tuwunel — and which the operator sets by hand when the
  # homeserver lives on another machine.
  #
  # NOT the agent-facing HIVE_MATRIX_URL above: that one is the gateway
  # vhost, and it is absent whenever there is no vhost. Reusing it here
  # would silently stop provisioning on a hive that runs matrix without
  # one.
  HIVE_MATRIX_API_URL = config.services.hyperhive.swarm.matrix.apiUrl;
}
// lib.optionalAttrs config.services.hyperhive.swarm.matrix.gui.enable {
  # Availability flags read by the dashboard's `/api/state`.
  # Matrix GUI lives entirely on the gateway nginx (matrix tab
  # only shows when both flags are on). Gateway routing detail:
  # docs/gateway.md::Vhost map.
  HIVE_MATRIX_GUI_ENABLED = "1";
}
// {
  # The gateway always runs, so the dashboard always builds
  # same-origin `/agent/<name>/` links (never the direct
  # `<host>:<port>` TCP fallback). Kept as an env flag so the
  # dashboard doesn't need to learn the gateway is unconditional.
  HIVE_GATEWAY_ENABLED = "1";
}
// lib.optionalAttrs (config.services.hyperhive.swarm.forge.publicUrl != null) {
  # Public URL of the forge, for the dashboard to build browser-facing
  # forge links from instead of guessing `<hostname>:3000` (which
  # breaks the moment the operator's browser hostname isn't the forge
  # host, e.g. through the gateway or a reverse proxy). Sourced from
  # `services.hyperhive.swarm.forge.publicUrl`, which itself defaults to the
  # gateway vhost URL when `behindGateway = true` and `null` otherwise
  # — see that option's doc for the "hide, don't guess" rationale.
  # Absent here whenever `publicUrl` is `null`; the dashboard hides
  # forge links rather than emitting one it can't justify.
  HIVE_FORGE_PUBLIC_URL = config.services.hyperhive.swarm.forge.publicUrl;
}
//
  lib.optionalAttrs
    (
      config.services.hyperhive.swarm.matrix.gui.enable
      && config.services.hyperhive.swarm.matrix.gatewayHost != null
    )
    {
      # Browser-facing matrix GUI (fluffychat) URL — the gateway
      # vhost (`matrix.<domain>`). Surfaced via the daemon's `Urls`
      # request for `hivectl open matrix`. Absent when the GUI is off
      # or no gatewayHost is set (no browser-reachable matrix vhost).
      HIVE_MATRIX_PUBLIC_URL = "https://${config.services.hyperhive.swarm.matrix.gatewayHost}/";
    }
// lib.optionalAttrs (config.services.hyperhive.swarm.snapshotStore.address != null) {
  # `host:port` of the swarm's single snapshot store, for pushing agent
  # snapshots (hive-c0re::snapshot_push). One per swarm, not one per
  # peer — the receiver keys destinations by agent so a migrating agent
  # keeps one incremental chain. Absent when no store is configured, and
  # a push then fails naming the option rather than guessing.
  HYPERHIVE_SNAPSHOT_STORE =
    let
      s = config.services.hyperhive.swarm.snapshotStore;
    in
    "${s.address}:${toString s.port}";
}
// lib.optionalAttrs (config.services.hyperhive.swarm.peerHives != { }) {
  # Peer hives serialised as a JSON array of {domain, cert_fingerprint,
  # wireguard_address?} objects. Consumed by hive-agent::identity::peers()
  # + the dashboard's peer_hives StateSnapshot field (P33RS tab).
  # `cert_fingerprint` is null for CA-trusted hives; `wireguard_address`
  # is omitted when not part of the mesh.
  #
  # Reads `peerHives` — `swarm.hives` minus this hive — so the "not me"
  # filter is the one derived in ../swarm.nix rather than a fifth copy.
  HYPERHIVE_PEERS = builtins.toJSON (
    lib.mapAttrsToList (
      _name: p:
      {
        inherit (p) domain;
        cert_fingerprint = p.certFingerprint;
      }
      // lib.optionalAttrs (p.wireguardAddress != null) {
        wireguard_address = p.wireguardAddress;
      }
    ) config.services.hyperhive.swarm.peerHives
  );
}