{ config, pkgs, lib, ... }:

with lib;
let
  domain = "fudo.org";
  hostname = "france.${domain}";
  mail-hostname = hostname;
  host_ipv4 = "208.81.3.117";
  # Use a special IP for git.fudo.org, since it needs to be SSH-able
  docker_ipv4 = "208.81.3.126";
  all-hostnames = [];

  acme-private-key = hostname: "/var/lib/acme/${hostname}/key.pem";
  acme-certificate = hostname: "/var/lib/acme/${hostname}/fullchain.pem";
  acme-ca = "/etc/nixos/static/letsencryptauthorityx3.pem";

  fudo-ca = "/etc/nixos/static/fudo_ca.pem";

  minecraft-data-dir = "/srv/minecraft/data";

  system-mail-directory = "/srv/mail";

in {

  boot.loader.grub = {
    enable = true;
    version = 2;
    device = "/dev/sda";
  };

  imports = [
    ../hardware-configuration.nix

    ../defaults.nix
  ];

  fudo.common = {
    # Sets some server-common settings. See /etc/nixos/fudo/profiles/...
    profile = "server";

    # Sets some common site-specific settings: gateway, monitoring, etc. See /etc/nixos/fudo/sites/...
    site = "portage";

    domain = domain;

    www-root = /srv/www;

    local-networks = [
      "208.81.1.128/28"
      "208.81.3.112/28"
      "172.17.0.0/16"
      "127.0.0.0/8"
    ];
  };

  environment.systemPackages = with pkgs; [
    docker
    lxd
    multipath-tools
    nix-prefetch-docker
    tshark
  ];

  fudo.prometheus = {
    enable = true;
    hostname = "metrics.fudo.org";
    service-discovery-dns = {
      node =    [ "node._metrics._tcp.fudo.org" ];
      postfix = [ "postfix._metrics._tcp.fudo.org" ];
      dovecot = [ "dovecot._metrics._tcp.fudo.org" ];
      rspamd =  [ "rspamd._metrics._tcp.fudo.org" ];
    };
  };

  fudo.grafana = {
    enable = true;
    hostname = "monitor.fudo.org";
    smtp-username = "metrics";
    smtp-password-file = "/srv/grafana/secure/smtp.passwd";
    admin-password-file = "/srv/grafana/secure/admin.passwd";
    secret-key-file = "/srv/grafana/secure/secret.key";
    prometheus-host = "metrics.fudo.org";
    database = {
      name = "grafana";
      hostname = "localhost";
      user = "grafana";
      password-file = /srv/grafana/secure/db.passwd;
    };
  };

  # So that grafana waits for postgresql
  systemd.services.grafana.after = [
    "postgresql.service"
  ];

  fudo.postgresql = {
    enable = true;
    ssl-private-key = (acme-private-key hostname);
    ssl-certificate = (acme-certificate hostname);
    keytab = "/srv/postgres/secure/postgres.keytab";

    # We allow connections from local networks. Auth is still required. Outside
    # of these networks, no access is allowed.
    #
    # TODO: that's probably too strict, allow kerberos connections from anywhere?
    local-networks = [
      "208.81.1.128/28"
      "208.81.3.112/28"
      "192.168.11.1/24"
      "127.0.0.1/8"
      "172.17.0.0/16"
    ];

    users = {
      fudo_git = {
        password = fileContents "/srv/git/secure/db.passwd";
        databases = {
          fudo_git = "ALL PRIVILEGES";
        };
      };
      gitlab_postgres = {
        password = fileContents "/srv/gitlab/secure/db.passwd";
        databases = {
          gitlab = "ALL PRIVILEGES";
        };
      };
      grafana = {
        password = fileContents "/srv/grafana/secure/db.passwd";
        databases = {
          grafana = "ALL PRIVILEGES";
        };
      };
      mattermost = {
        password = fileContents "/srv/mattermost/secure/db.passwd";
        databases = {
          mattermost = "ALL PRIVILEGES";
        };
      };
      webmail = {
        password = fileContents "/srv/webmail/secure/db.passwd";
        databases = {
          webmail = "ALL PRIVILEGES";
        };
      };
      niten = {};
    };

    local-users = [
      "fudo_git"
    ];

    databases = {
      fudo_git = ["niten"];
      gitlab = ["niten"];
      grafana = ["niten"];
      mattermost = ["niten"];
      webmail = ["niten"];
    };
  };

  # Not all users need access to france; don't allow LDAP-user access.
  fudo.authentication.enable = false;

  # But we DO run an LDAP auth server. Should be better-named.
  fudo.auth = {
    server = {
      enable = true;
      base = "dc=fudo,dc=org";
      organization = "Fudo";
      rootpw-file = "/srv/ldap/secure/root.pw";
      kerberos-host = "france.fudo.org";
      kerberos-keytab = "/srv/ldap/secure/ldap.keytab";

      sslCert = "/srv/ldap/france.fudo.org.pem";
      sslKey = "/srv/ldap/secure/france.fudo.org-key.pem";
      sslCACert = fudo-ca;

      # We're using fudo-generated certs for now, but we should move to ACME
      # once I can figure out how to correctly produce the ca.pem file. Until
      # then, the server will fail to start using these certs. See:
      # https://serverfault.com/a/834565

      # sslCert = (acme-bare-cert hostname);
      # sslKey = (acme-private-key hostname);
      # sslCACert = acme-ca;

      # TODO: loop over v4 and v6 IPs.
      listen-uris = [
        "ldap:///"
        "ldaps:///"
        # "ldap://${host_ipv4}/"
        # "ldaps://${host_ipv4}/"
        # "ldap://localhost/"
        # "ldaps://localhost/"
        # "ldap://127.0.1.1/"
        # "ldaps://127.0.1.1/"
        "ldapi:///"
      ];

      users = import ../fudo/users.nix;

      groups = import ../fudo/groups.nix;

      system-users = import ../fudo/system-users.nix;
    };

    # Heimdal Kerberos server
    kdc = {
      enable = true;
      database-path = "/var/heimdal/heimdal";
      realm = "FUDO.ORG";
      mkey-file = "/var/heimdal/m-key";
      acl-file = "/etc/heimdal/kdc.acl";
      bind-addresses = [
        host_ipv4
        "127.0.0.1"
        "127.0.1.1"
      ];
    };
  };

  # TODO: not used yet
  fudo.acme.hostnames = all-hostnames;

  fudo.mail-server = import ../fudo/email.nix { inherit config; } // {
    enableContainer = true;
    debug = true;
    monitoring = true;

    hostname = mail-hostname;

    postfix.ssl-certificate = (acme-certificate mail-hostname);
    postfix.ssl-private-key = (acme-private-key mail-hostname);
    dovecot.ssl-certificate = (acme-certificate mail-hostname);
    dovecot.ssl-private-key = (acme-private-key mail-hostname);

    state-directory = "${system-mail-directory}/var";
    mail-directory = "${system-mail-directory}/mailboxes";

    dovecot.ldap-reader-dn = "cn=user_db_reader,dc=fudo,dc=org";
    dovecot.ldap-reader-passwd = fileContents /srv/ldap/secure/user_db.passwd;

    # FIXME: use SSL once I can figure out Acme SSL cert CA for LDAP.
    dovecot.ldap-urls = [ "ldap://france.fudo.org" ];

    clamav.enable = true;

    dkim.signing = true;
  };

  fudo.webmail = {
    enable = true;

    sites = {
      "webmail.fudo.link" = {
        title = "Fudo Link Webmail";
        favicon = "/etc/nixos/static/fudo.link/favicon.ico";
        mail-server = mail-hostname;
        domain = "fudo.link";
        edit-mode = "Plain";
        layout-mode = "bottom";
        database = {
          name = "webmail";
          hostname = "localhost";
          user = "webmail";
          password-file = "/srv/webmail/secure/db.passwd";
        };
      };

      "webmail.test.fudo.org" = {
        title = "Fudo Webmail";
        favicon = "/etc/nixos/static/fudo.org/favicon.ico";
        mail-server = mail-hostname;
        domain = "test.fudo.org";
        edit-mode = "Plain";
        database = {
          name = "webmail";
          hostname = "localhost";
          user = "webmail";
          password-file = /srv/webmail/secure/db.passwd;
        };
      };

      "webmail.test.selby.ca" = {
        title = "Selby Webmail";
        favicon = "/etc/nixos/static/selby.ca/favicon.ico";
        mail-server = mail-hostname;
        domain = "test.selby.ca";
        database = {
          name = "webmail";
          hostname = "localhost";
          user = "webmail";
          password-file = /srv/webmail/secure/db.passwd;
        };
      };
    };
  };

  fudo.chat = {
    enable = true;

    hostname = "chat.fudo.org";
    site-name = "Fudo Chat";
    smtp-server = "france.fudo.org";
    smtp-user = "chat";
    smtp-password-file = "/srv/mattermost/secure/smtp.passwd";
    database = {
      name = "mattermost";
      hostname = "localhost";
      user = "mattermost";
      password-file = "/srv/mattermost/secure/db.passwd";
    };
  };

  fudo.git = {
    enable = true;
    hostname = "git.test.fudo.org";
    site-name = "Fudo Git";
    user = "fudo_git";
    database = {
      user = "fudo_git";
      password-file = /srv/git/secure/db.passwd;
      hostname = "127.0.0.1";
      name = "fudo_git";
    };
    repository-dir = /srv/git/repo;
    state-dir = /srv/git/state;
  };

  networking = {
    hostName = hostname;

    dhcpcd.enable = false;
    useDHCP = false;

    # TODO: fix IPv6
    enableIPv6 = false;

    # Create a bridge for VMs to use
    macvlans = {
      extif0 = {
        interface = "enp4s0f0";
        mode = "bridge";
      };
      extif1 = {
        interface = "enp4s0f0";
        mode = "bridge";
      };
      intif0 = {
        interface = "enp4s0f1";
        mode = "bridge";
      };
    };

    interfaces = {
      extif0 = {
        # result of:
        # echo $FQDN-extif|md5sum|sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:\1:\2:\3:\4:\5/'
        macAddress = "02:d4:e8:3b:10:2f";
        ipv4.addresses = [
          {
            address = host_ipv4;
            prefixLength = 28;
          }
        ];
      };
      extif1 = {
        macAddress = "02:6d:e2:e1:ad:ca";
        ipv4.addresses = [
          {
            address = docker_ipv4;
            prefixLength = 28;
          }
        ];
      };
      intif0 = {
        # result of:
        # echo $FQDN-intif|md5sum|sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:\1:\2:\3:\4:\5/'
        macAddress = "02:ba:ba:e9:08:21";
        ipv4.addresses = [
          {
            address = "192.168.11.1";
            prefixLength = 24;
          }
        ];
      };
    };
  };

  hardware.bluetooth.enable = false;

  virtualisation = {
    docker = {
      enable = true;
      enableOnBoot = true;

      autoPrune = {
        enable = true;
      };
    };

    lxd = {
      enable = true;
    };
  };

  fileSystems = {
    "/srv/archiva" = {
      fsType = "btrfs";
      options = ["subvol=archiva"];
      label = "pool0";
    };
    "/srv/grafana" = {
      fsType = "btrfs";
      options = ["subvol=grafana"];
      label = "pool0";
    };
    "${system-mail-directory}" = {
      fsType = "btrfs";
      options = ["subvol=mail"];
      label = "pool0";
    };
    "/srv/gitlab" = {
      fsType = "btrfs";
      options = ["subvol=gitlab"];
      label = "pool0";
    };
    "/var/lib/lxd/storage-pools/pool0" = {
      fsType = "btrfs";
      label = "pool0";
      device = "/dev/disk/by-label/pool0";
    };
    "/var/lib/lxd/storage-pools/pool1" = {
      fsType = "btrfs";
      label = "pool1";
      device = "/dev/france-user/fudo-user";
    };
  };

  users = {
    extraUsers = {
      archiva = {
        isNormalUser = false;
        group = "nogroup";
        uid = 8001;
      };

      fudo_git = {
        isNormalUser = false;
        uid = 8006;
      };

      gitlab = {
        isNormalUser = false;
        uid = 8002;
      };

      gitlab_postgres = {
        isNormalUser = false;
        group = config.fudo.postgresql.socket-group;
        uid = 8003;
      };

      gitlab_redis = {
        isNormalUser = false;
        group = "redis-local";
        uid = 8004;
      };

      gitlab_www = {
        isNormalUser = false;
        group = "nogroup";
        uid = 8005;
      };
    };

    extraGroups = {
      redis-local = {
        members = ["redis"];
        gid = 7001;
      };
    };
  };

  boot.kernel.sysctl = {
    # For Redis
    "vm.overcommit_memory" = 1;
  };

  fudo.system = {
    disableTransparentHugePages = true;
    postHugePageServices = ["redis.service"];
  };

  systemd.services.redis.postStart = ''
    chgrp redis-local ${config.services.redis.unixSocket}
  '';

  security.acme.certs = {
    "archiva.fudo.org".email = config.fudo.common.admin-email;
    "git.fudo.org".email = config.fudo.common.admin-email;
  };

  services = {

    redis = {
      enable = true;
      bind = "127.0.0.1";
      unixSocket = "/run/redis/redis.socket";
      extraConfig = ''
        unixsocketperm 770
      '';
    };

    nginx = {
      enable = true;
      recommendedGzipSettings = true;
      recommendedOptimisation = true;
      recommendedTlsSettings = true;

      virtualHosts = {
        "archiva.fudo.org" = {
          enableACME = true;
          forceSSL = true;

          locations."/" = {
            proxyPass = "http://127.0.0.1:8001";
            extraConfig = ''
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-By $server_addr:$server_port;
                proxy_set_header X-Forwarded-For $remote_addr;
                proxy_set_header X-Forwarded-Proto $scheme;
              '';
          };
        };

        "git.fudo.org" = {
          enableACME = true;
          forceSSL = true;

          locations."/" = {
            proxyPass = "http://127.0.0.1:8002";
            extraConfig = ''
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-By $server_addr:$server_port;
                proxy_set_header X-Forwarded-For $remote_addr;
                proxy_set_header X-Forwarded-Proto $scheme;
              '';
          };
        };
      };
    };
  };

  docker-containers = {
    archiva = {
      image = "xetusoss/archiva";
      ports = ["127.0.0.1:8001:8080"];
      # Ugly: name-to-uid lookup fails.
      user = toString config.users.users.archiva.uid;
      volumes = [
        "/srv/archiva:/archiva-data"
      ];
      environment = {
        # Not directly connected to the world anyway
        SSL_ENABLED = "false";
      };
    };

    gitlab = {
      image = "gitlab/gitlab-ce:12.8.1-ce.0";
      ports = [
        "127.0.0.1:8002:80"
        "${docker_ipv4}::22"
      ];
      # user = toString config.users.users.gitlab.uid;
      volumes = [
        "/run/redis:/var/opt/gitlab/redis"
        "/srv/gitlab/builds:/var/opt/gitlab/gitlab-ci/builds"
        "/srv/gitlab/config:/etc/gitlab"
        "/srv/gitlab/logs:/var/log/gitlab"
        "/srv/gitlab/gitlab:/var/opt/gitlab"
        "${config.fudo.postgresql.socket-directory}:/run/postgresql"
        "${config.fudo.postgresql.socket-directory}:/var/opt/gitlab/postgresql"
      ];
      extraDockerOptions = [
        "--hostname=git.fudo.org"
      ];
    };
  };

  systemd.services.docker-gitlab-config = let
    gitlab-config = pkgs.writeText "gitlab-config.rb" ''
      gitlab_rails['db_adapter'] = "postgresql"
      gitlab_rails['db_encoding'] = "unicode"
      gitlab_rails['db_database'] = "gitlab"
      gitlab_rails['db_username'] = "gitlab_postgres"
      gitlab_rails['db_password'] = "${fileContents /srv/gitlab/secure/db.passwd}"

      user['uid'] = "${toString config.users.users.gitlab.uid}"
      user['gid'] = "${toString config.users.groups.redis-local.gid}"

      # Provided externally
      redis['enable'] = false
      postgresql['enable'] = false

      web_server['uid'] = "${toString config.users.users.gitlab_www.uid}"
      web_server['gid'] = "${toString config.users.groups.nogroup.gid}"
    '';
  in {
    # before = ["docker-gitlab.service"];
    script = "cp -f ${gitlab-config} /srv/gitlab/config/gitlab.rb";
  };
  systemd.services.docker-gitlab.requires = ["docker-gitlab-config.service"];

  ###
  # Minecraft
  ###

  fudo.minecraft-server = {
    enable = true;
    package = pkgs.minecraft-server_1_15_2;
    data-dir = minecraft-data-dir;
    world-name = "selbyland";
    motd = "Welcome to the Selby Minecraft server.";
  };
}