# SPDX-FileCopyrightText: 2020 Luke Granger-Brown <depot@lukegb.com>
#
# SPDX-License-Identifier: Apache-2.0

{ depot, lib, pkgs, rebuilder, config, ... }:
let
  inherit (depot.ops) secrets;
in {
  imports = [
    ../../../third_party/nixpkgs/nixos/modules/installer/scan/not-detected.nix
    ../lib/client.nix
    ../lib/whitby-distributed.nix
    ../lib/twitternuke.nix
    ../lib/quotes.bfob.gg.nix
  ];

  boot.initrd.availableKernelModules = [ "xhci_pci" "ahci" "nvme" "usb_storage" "usbhid" "sd_mod" ];
  boot.kernelModules = lib.mkAfter [ "kvm-intel" ];
  boot.kernelParams = [ "mitigations=off" ];

  fileSystems = let
    zfs = device: {
      device = device;
      fsType = "zfs";
    };
  in {
    "/" = zfs "zboot/safe/root";
    "/nix" = zfs "zboot/local/nix";

    "/home" = zfs "tank/safe/home";
    "/export" = zfs "tank/safe/export";
    "/srv" = zfs "tank/safe/srv";
    "/srv/pancake" = zfs "tank/safe/srv/pancake";

    "/persist" = zfs "tank/safe/persist";
    "/store" = zfs "tank/local/store";

    "/boot" = {
      device = "/dev/disk/by-uuid/D178-4E19";
      fsType = "vfat";
    };
  };

  # Use the systemd-boot EFI boot loader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  services.postgresql.package = pkgs.postgresql_13;

  nix.maxJobs = lib.mkDefault 8;
  powerManagement.cpuFreqGovernor = lib.mkDefault "performance";
  virtualisation = {
    podman.enable = true;
  };

  services.openssh.forwardX11 = true;

  # Extra packages.
  environment.systemPackages = with pkgs; [
    (depot.nix.pkgs.secretsync.configure {
      workingDir = "/home/lukegb/depot";
      gitlabAccessToken = secrets.deployer.gitlabAccessToken;
      manifestVariable = "SECRETS_MANIFEST";
      variablesToFile = {
        "OPS_SECRETS_DEFAULT_NIX" = "ops/secrets/default.nix";
      };
    })
  ];

  # Networking!
  networking = {
    hostName = "totoro"; # Define your hostname.
    domain = "int.as205479.net";
    hostId = "676c08c4";
    useDHCP = false;
    interfaces.br-ext.useDHCP = true;
    bridges.br-ext.interfaces = [ "enp0s31f6" ];

    interfaces.br-int = {
      virtual = true;
      useDHCP = false;
      ipv4.addresses = [{ address = "10.0.0.2"; prefixLength = 24; }];
    };
    bridges.br-int.interfaces = [];
    firewall.allowedTCPPorts = [
      80 443  # web
      4001  # ipfs
    ];
    firewall.allowedUDPPorts = [
      4001  # ipfs
    ];
  };
  my.ip.tailscale = "100.122.86.11";

  # Virtualisation
  virtualisation.libvirtd = {
    enable = true;
    allowedBridges = [ "virbr0" "br-ext" ];
  };
  users.users.lukegb = {
    packages = with depot.pkgs; [ irssi ];
    extraGroups = lib.mkAfter [ "libvirtd" ];
  };
  users.users.pancake = {
    isSystemUser = true;
    group = "pancake";
    home = "/srv/pancake";
  };
  users.users.nginx.extraGroups = lib.mkAfter [ "acme" ];
  users.groups.pancake = {
    members = ["pancake" "nginx"];
  };

  systemd.tmpfiles.rules = [
    "L /var/lib/export - - - - /export"
  ];

  services.nginx = {
    enable = true;
    package = pkgs.nginxMainline;
    additionalModules = with pkgs.nginxModules; [
      rtmp
    ];
    appendConfig = ''
      rtmp {
        server {
          listen 1935;
          chunk_size 4000;
          application app {
            live on;
            record off;
            allow publish all;
            allow play all;
            push rtmp://coventry.beam.bfob.gg/beam/thecakeisalie;
          }
        }
      }
    '';
    virtualHosts = {
      "invoices.lukegb.com" = let
        fastcgi = {
          extraConfig = ''
            rewrite ^(.*)$ /index.php break;
            fastcgi_split_path_info ^(.+\.php)(/.+)$;
            fastcgi_index index.php;
            fastcgi_pass unix:${config.services.phpfpm.pools.pancake.socket};
            include ${pkgs.nginx}/conf/fastcgi_params;
            include ${pkgs.nginx}/conf/fastcgi.conf;
          '';
        };
      in {
        root = "/srv/pancake/public_html";
        useACMEHost = "invoices.lukegb.com";
        forceSSL = true;
        locations."/" = {
          tryFiles = "$uri $uri/ @router";
          index = "index.html index.php";
          extraConfig = ''
            error_page 403 = @router;
            error_page 404 = @router;
          '';
        };
        locations."~ (.php|\\/[^./]+)$" = fastcgi;
        locations."@router" = fastcgi;
      };
    };
  };
  services.phpfpm = let settingsBase = {
    "listen.owner" = config.services.nginx.user;
    "pm" = "dynamic";
    "pm.max_children" = 32;
    "pm.max_requests" = 500;
    "pm.start_servers" = 2;
    "pm.min_spare_servers" = 2;
    "pm.max_spare_servers" = 5;
    "php_admin_value[error_log]" = "stderr";
    "php_admin_flag[log_errors]" = true;
    "catch_workers_output" = true;
  }; in {
    pools.pancake = {
      user = "pancake";
      group = "pancake";
      settings = settingsBase;
      phpEnv."PATH" = lib.makeBinPath [ pkgs.php ];
    };
  };
  services.mysql = {
    enable = true;
    package = pkgs.mariadb;
    ensureDatabases = ["pancake"];
    ensureUsers = [{
      name = "pancake";
      ensurePermissions = {
        "pancake.*" = "ALL PRIVILEGES";
      };
    }];
  };

  security.acme = {
    acceptTerms = true;
    email = "letsencrypt@lukegb.com";
    certs."invoices.lukegb.com" = {
      domain = "invoices.lukegb.com";
      dnsProvider = "cloudflare";
      credentialsFile = secrets.cloudflareCredentials;
      postRun = ''
        systemctl reload nginx
      '';
    };
  };

  services.prometheus = {
    enable = true;
    stateDir = "export/monitoring/prometheus";
    alertmanagers = [{
      scheme = "http";
      static_configs = [{
        targets = ["localhost:${toString config.services.prometheus.alertmanager.port}"];
      }];
    }];
    globalConfig.scrape_interval = "15s";
    scrapeConfigs = (builtins.attrValues depot.ops.nixos.systemExporters) ++ [{
      job_name = "blade-oa/snmp";
      metrics_path = "/snmp";
      params = {
        module = ["hpe"];
      };
      static_configs = [{
        targets = ["10.100.1.200"];
      }];
      relabel_configs = [{
        source_labels = ["__address__"];
        target_label = "__param_target";
      } {
        source_labels = ["__param_target"];
        target_label = "instance";
      } {
        target_label = "__address__";
        replacement = "totoro:${toString config.services.prometheus.exporters.snmp.port}";
      }];
    } {
      job_name = "minotar/minotarproxy";
      scheme = "https";
      static_configs = [{
        targets = ["minotarproxy.lukegb.xyz:443"];
      }];
    } {
      job_name = "nixos/prometheus";
      metrics_path = "/prometheus/federate";
      honor_labels = true;
      params = {
        "match[]" = [
          ''hydra_job_failed{current="1"}''
          ''hydra_job_completion_time{current="1"}''
        ];
      };
      scheme = "https";
      static_configs = [{
        targets = ["monitoring.nixos.org:443"];
      }];
    }];

    pushgateway.enable = true;

    rules = [
      ''
        groups:
        - name: alerting
          rules:

          # Blade power
          - alert: AveragePowerUsageTooHigh
            expr: (sum(avg_over_time(cpqRackPowerSupplyCurPwrOutput{job="blade-oa/snmp"}[10m])) / 230) > 6.5
            labels:
              severity: page
            annotations:
              summary: "Blade: Power Usage Too High (rolling)"
              description: "Power usage of blade system has been too high for last 10 minutes ({{ $value }}). https://grafana.int.lukegb.com/d/g-u3XQ8Gk/blade-power"
          - alert: PowerUsageTooHigh
            expr: (sum(cpqRackPowerSupplyCurPwrOutput{job="blade-oa/snmp"}) / 230) > 6.5
            for: 10m
            labels:
              severity: page
            annotations:
              summary: "Blade: Power Usage Too High"
              description: "Power usage of blade system has been too high for last 10 minutes ({{ $value }}). https://grafana.int.lukegb.com/d/g-u3XQ8Gk/blade-power"
          - alert: BladePowerUsageOutOfBounds
            expr: node_hwmon_power_average_watt{system=~"blade-.*"} > on () group_left() (1.5 * quantile(0.5, node_hwmon_power_average_watt{system=~"blade-.*"}))
            for: 60m
            labels:
              severity: page
            annotations:
              summary: "Blade: Single Blade Power Usage Out of Bounds"
              description: "{{ $labels.system }} has power usage of {{ $value }}, which is out of expected bounds."

          # Systems
          - alert: NodeExporterDown
            expr: up{exporter="node", system=~"(blade-(tuvok|paris|janeway|torres)|kusakabe|marukuru|swann|totoro|clouvider-.*|etheroute-.*)"} < 1
            for: 30m
            labels:
              severity: page
            annotations:
              summary: "Node exporter no longer scrapable"
              description: "{{ $labels.system }} is not reachable from totoro."

          # Alert if the NixOS channels are broken
          - alert: NixOSChannelBad
            expr: hydra_job_failed{} == 1
            for: 30m
            labels:
              severity: email
            annotations:
              summary: "NixOS Channel {{ $labels.channel }} failing"
              description: "The channel {{ $labels.channel }} is failing - see https://hydra.nixos.org/job/{{ $labels.project }}/{{ $labels.jobset }}/tested"

          # Packet loss
          - alert: SmokepingAveragePacketLossHigh
            expr: (avg((rate(smokeping_requests_total{host=~"(([a-z0-9]+.)+[a-z]+|([0-9]+.){3}[0-9]+)"}[5m]) - rate(smokeping_response_duration_seconds_count[5m])) / rate(smokeping_requests_total[5m])) by (system)) >= 0.01
            for: 10m
            labels:
              severity: page
            annotations:
              summary: "Average packet loss from {{ $labels.system }} high"
              description: "The average packet loss from {{ $labels.system }} is {{ $value | humanizePercentage }}%, which is too high."
          - alert: SmokepingPacketLossVeryHigh
            expr: ((rate(smokeping_requests_total{host=~"(([a-z0-9]+.)+[a-z]+|([0-9]+.){3}[0-9]+)"}[5m]) - rate(smokeping_response_duration_seconds_count[5m])) / rate(smokeping_requests_total[5m])) >= 0.10
            for: 10m
            labels:
              severity: page
            annotations:
              summary: "Packet loss to {{ $labels.host }} from {{ $labels.system }} high"
              description: "The packet loss from {{ $labels.system }} to {{ $labels.host }} (IP: {{ $labels.ip }}) is very high ({{ $value | humanizePercentage }}%)."

          # Ping latency
          - alert: Smokeping95LatencyHigh
            expr: histogram_quantile(0.95, sum(rate(smokeping_response_duration_seconds_bucket{host=~"^(1.1.1.1|8.8.8.8)$"}[5m])) by (le, host, system)) > 0.03
            for: 15m
            labels:
              severity: page
            annotations:
              summary: "Ping latency from {{ $labels.system }} to {{ $labels.host }} high"
              description: "The 95th-percentile ping latency from {{ $labels.system }} to {{ $labels.host }} is {{ $value }}."

          # Internet connectivity
          - alert: MaldenRoadInternetConnectivityFailure 
            expr: sum(bird_bfd_session_state{state="Up"} * on(instance,name,neighbor_address,system) group_left(device) bird_bfd_session_device) by (instance,neighbor_address,device,state,system) < 1
            for: 15m
            labels:
              severity: page
            annotations:
              summary: "Device {{ $labels.device }} on {{ $labels.system }} reports BFD down to neighbour {{ $labels.neighbor_address }}"
              description: "Ruh roh, Raggy"
      ''
    ];

    alertmanager = {
      enable = true;
      configuration = {
        global = {};
        route = {
          receiver = "default-receiver";
        };
        receivers = [{
          name = "default-receiver";
          webhook_configs = [{
            url = "http://localhost:9997";
          }];
          pushover_configs = [{
            user_key = secrets.pushover.userKey;
            token = secrets.pushover.tokens.alertmanager;
          }];
        }];
      };
    };

    exporters.snmp = {
      enable = true;
      configurationPath = depot.nix.pkgs.prometheus-snmp-config;
    };
  };
  services.grafana = {
    enable = true;
    addr = "0.0.0.0";
    port = 3000;
    domain = "grafana.int.lukegb.com";
    rootUrl = "https://grafana.int.lukegb.com/";

    extraOptions = let
      convertName = name: lib.toUpper (builtins.replaceStrings ["." "-"] ["_" "_"] name);
      convertOptionSection = sectionName: lib.mapAttrsToList (name: value: { name = "${convertName sectionName}_${convertName name}"; inherit value; });
      convertOptions = opts: builtins.listToAttrs (builtins.concatLists (lib.mapAttrsToList convertOptionSection opts));
    in convertOptions {
      "auth.proxy" = {
        enabled = "true";
        header_name = "X-Pomerium-Claim-Email";
        header_property = "email";
        headers = "username:X-Pomerium-Claim-User";
        auto_sign_up = "true";
      };
      security.cookie_secure = "true";
    };
  };
  systemd.services.grafana.preStart = let
    cfg = config.services.grafana;
    plugins = with depot.pkgs.grafana-plugins; [
      grafana-piechart-panel
      grafana-clock-panel
      grafana-worldmap-panel
      grafana-polystat-panel
    ];
    pluginLines = lib.concatMapStringsSep "\n" (pkg: ''
      ln -sf ${pkg} ${cfg.dataDir}/plugins/${pkg.pname}
    '') plugins;
  in lib.mkAfter ''
    rm -rf ${cfg.dataDir}/plugins
    mkdir ${cfg.dataDir}/plugins
    ${pluginLines}
  '';

  services.ipfs = {
    enable = true;
    dataDir = "/store/ipfs";
    extraConfig = {
      Experimental.FilestoreEnabled = true;
    };
  };

  systemd.services.alertmanager-discord = {
    enable = true;
    wantedBy = [ "multi-user.target" ];
    serviceConfig = {
      ExecStart = "${depot.pkgs.alertmanager-discord}/bin/alertmanager-discord -listen.address 127.0.0.1:9997";
      EnvironmentFile = pkgs.writeText "discord-secret" ''
        DISCORD_WEBHOOK=${secrets.monitoring.alertmanager.discord.api_url}
      '';
      DynamicUser = true;
      MountAPIVFS = true;
      PrivateTmp = true;
      PrivateUsers = true;
      ProtectControlGroups = true;
      ProtectKernelModules = true;
      ProtectKernelTunables = true;
    };
  };

  systemd.services.sslrenew-raritan = {
    enable = true;
    after = [ "network-online.target" ];
    serviceConfig = {
      Type = "oneshot";
      ExecStart = "${depot.ops.raritan.ssl-renew}/lego.sh";
      EnvironmentFile = pkgs.writeText "sslrenew-secret" ''
        CERTIFICATE_DOMAIN=kvm.lukegb.xyz
        LETSENCRYPT_EMAIL=letsencrypt@lukegb.com
        CF_DNS_API_TOKEN=${secrets.cloudflareCredentials.token}
        RARITAN_IP=192.168.1.50
        RARITAN_USERNAME=${secrets.raritan.sslrenew.username}
        RARITAN_PASSWORD=${secrets.raritan.sslrenew.password}
      '';
      DynamicUser = true;
      StateDirectory = "sslrenew-raritan";
      StateDirectoryMode = "0700";
      WorkingDirectory = "/var/lib/sslrenew-raritan";
    };
  };
  systemd.timers.sslrenew-raritan = {
    enable = true;
    wantedBy = [ "timers.target" ];
    timerConfig = {
      OnCalendar = "daily";
    };
  };

  system.stateVersion = "20.03";
}