{
  config,
  inputs,
  lib,
  ...
}:
with lib; let
  cfg = config.nixfiles.modules.grafana;
in {
  options.nixfiles.modules.grafana = {
    enable = mkEnableOption "Grafana";

    port = mkOption {
      description = "Port.";
      type = with types; port;
      default = 30101;
    };

    domain = mkOption {
      description = "Domain name sans protocol scheme.";
      type = with types; nullOr str;
      default = "grafana.${config.networking.domain}";
    };
  };

  config = let
    db = "grafana";
  in
    mkIf cfg.enable {
      secrets = {
        grafana-key = {
          file = "${inputs.self}/secrets/grafana-key";
          owner = "grafana";
          group = "grafana";
        };
        grafana-admin-password = {
          file = "${inputs.self}/secrets/grafana-admin-password";
          owner = "grafana";
          group = "grafana";
        };
        grafana-smtp-password = {
          file = "${inputs.self}/secrets/grafana-smtp-password";
          owner = "grafana";
          group = "grafana";
        };
      };

      nixfiles.modules = {
        nginx = {
          enable = true;
          upstreams.grafana.servers."127.0.0.1:${toString cfg.port}" = {};
          virtualHosts.${cfg.domain} = {
            locations."/" = {
              proxyPass = "http://grafana";
              proxyWebsockets = true;
            };
            extraConfig = nginxInternalOnly;
          };
        };
        postgresql = {
          enable = true;
          extraPostStart = [
            ''
              $PSQL "${db}" -tAc 'GRANT ALL ON SCHEMA "public" TO "${db}"'
            ''
          ];
        };
      };

      services = {
        grafana = {
          enable = true;

          settings = {
            server = with cfg; {
              protocol = "http";
              http_addr = "127.0.0.1";
              http_port = port;
              inherit domain;
              enable_gzip = true;
            };
            database = {
              type = "postgres";
              host = "/run/postgresql";
              name = db;
              user = db;
            };
            smtp = {
              enable = true;
              user = "azahi@shire.me";
              host = my.domain.shire;
              password = "$__file{${config.secrets.grafana-smtp-password.path}}";
            };
            user = {
              allow_org_create = false;
              allow_sign_up = false;
              auto_assign_org = false;
              auto_assign_org_role = "Viewer";
            };
            security = with config.secrets; {
              secret_key = grafana-key.path;
              admin_password = grafana-admin-password.path;
            };
            analytics.reporting_enable = false;
          };
        };

        postgresql = {
          ensureDatabases = [db];
          ensureUsers = [
            {
              name = db;
              ensurePermissions."DATABASE \"${db}\"" = "ALL";
            }
          ];
        };
      };
    };
}