# See morph/grid/local/grid.nix for additional commentary.
let
  gridlib = import ../../lib;
  grid-config = builtins.fromJSON (builtins.readFile ./config.json);

  # Module with per-grid configuration
  grid-module = {config, ...}: {
    imports = [
      gridlib.base
      # Allow us to remotely trigger updates to this system.
      ../../../nixos/modules/deployment.nix
      # Give it a good SSH configuration.
      ../../../nixos/modules/ssh.nix
    ];
    services.private-storage.sshUsers = import ./public-keys/users.nix;
    networking.domain = grid-config.domain;
    # Convert relative paths to absolute so library code can resolve names
    # correctly.
    grid = {
      publicKeyPath = toString ./. + "/${grid-config.publicKeyPath}";
      privateKeyPath = toString ./. + "/${grid-config.privateKeyPath}";
      inherit (grid-config) monitoringvpnEndpoint letsEncryptAdminEmail;
    };
    # Configure deployment management authorization for all systems in the grid.
    services.private-storage.deployment = {
      authorizedKey = builtins.readFile "${config.grid.publicKeyPath}/deploy_key.pub";
      gridName = "production";
    };
  };
  payments = {
    imports = [
      gridlib.issuer
      gridlib.hardware-payments-ovh
      grid-module
    ];
    config = {
      grid.monitoringvpnIPv4 = "172.23.23.11";
      grid.issuer = {
        inherit (grid-config) issuerDomains allowedChargeOrigins tokensPerVoucher;
      };
    };
  };

  monitoring = {
    imports = [
      gridlib.monitoring
      gridlib.hardware-monitoring-ovh
      grid-module
    ];
    config = {
      grid.monitoringvpnIPv4 = "172.23.23.1";
      grid.monitoring = {
        inherit paymentExporterTargets blackboxExporterHttpsTargets;
        inherit (grid-config) monitoringDomains;
        googleOAuthClientID = grid-config.monitoringGoogleOAuthClientID;
        enableSlackAlert = false;
      };
      system.stateVersion = "19.09";
    };
  };

  defineStorageNode = name: { vpnIP, stateVersion }:
  let
    nodecfg = import (./. + "/${name}-config.nix");
    hardware = (./. + "/${name}-hardware.nix");
  in {
    imports = [
      # Get some of the very lowest-level system configuration for this
      # node.  This isn't all *completely* hardware related.  Maybe some
      # more factoring is in order, someday.
      hardware

      # Slightly awkwardly, enable some of our hardware / network / bootloader options.
      ../../../nixos/modules/100tb.nix

      # At least some of our storage nodes utilize MegaRAID storage controllers.
      # Monitor their array status.
      ../../../nixos/modules/monitoring/exporters/megacli2prom.nix

      # Get all of the configuration that is common across all storage nodes.
      gridlib.storage
      # Also configure deployment management authorization
      grid-module
    ];

    config = {
      grid.monitoringvpnIPv4 = vpnIP;
      grid.storage = {
        inherit (grid-config) passValue publicStoragePort;
      };
      system.stateVersion = stateVersion;

      # And supply configuration for those hardware / network / bootloader
      # options.  See the 100tb module for handling of this value.  The module
      # name is quoted because `1` makes `100tb` look an awful lot like a
      # number.
      "100tb".config = nodecfg;

      # Enable statistics gathering for MegaRAID cards.
      # TODO would be nice to enable only on machines that have such a device.
      services.private-storage.monitoring.exporters.megacli2prom.enable = true;

      # Disable Borg Backup for this grid!
      services.private-storage.borgbackup.enable = false;
    };
  };

  # Define all of the storage nodes for this grid.
  storageNodes = builtins.mapAttrs defineStorageNode {
    storage001 = { vpnIP = "172.23.23.21"; stateVersion = "19.09"; };
    storage002 = { vpnIP = "172.23.23.22"; stateVersion = "19.09"; };
    storage003 = { vpnIP = "172.23.23.23"; stateVersion = "19.09"; };
  };

  paymentExporterTargets = [ "payments.monitoringvpn" ];
  blackboxExporterHttpsTargets = [
    "https://deerfield.leastauthority.com/"
    "https://www.deerfield.leastauthority.com/"
    "https://payments.deerfield.leastauthority.com/"
    "https://monitoring.deerfield.leastauthority.com/"
  ];

in {
  network = {
    description = "HRO Grid";
    inherit (gridlib) pkgs;
  };
  inherit payments;
  inherit monitoring;
} // storageNodes