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

{
  services.grafana.enable = true;
  services.grafana.settings.server = {
    http_port = 3000;
    http_addr = "0.0.0.0";
    # Grafana needs to know on which domain and URL it's running
    domain = "grafana.lab";
    # root_url = "https://monitor.local/grafana/"; # Not needed if it is `https://your.domain/`
    # serve_from_sub_path = true;
  };

  networking.firewall.allowedTCPPorts = [ 3000 ];

  services.grafana = {
    # declarativePlugins = with pkgs.grafanaPlugins; [ ... ];

    provision = {
      enable = true;

      datasources.settings.datasources = [
        # "Built-in" datasources can be provisioned - c.f. https://grafana.com/docs/grafana/latest/administration/provisioning/#data-sources
        {
          uid = "prometheus";
          name = "Prometheus";
          type = "prometheus";
          url = "http://127.0.0.1:${toString config.services.prometheus.port}";
        }
        {
          uid = "loki";
          name = "Loki";
          type = "loki";
          url = "http://127.0.0.1:${toString config.services.loki.configuration.server.http_listen_port}";
        }
        # Some plugins also can - c.f. https://grafana.com/docs/plugins/yesoreyeram-infinity-datasource/latest/setup/provisioning/
        # {
        #   name = "Infinity";
        #   type = "yesoreyeram-infinity-datasource";
        # }
        # But not all - c.f. https://github.com/fr-ser/grafana-sqlite-datasource/issues/141
      ];

      # Note: removing attributes from the above `datasources.settings.datasources` is not enough for them to be deleted on `grafana`;
      # One needs to use the following option:
      # datasources.settings.deleteDatasources = [ { name = "prometheus"; orgId = 1; } { name = "loki"; orgId = 1; } ];

      dashboards.settings.providers = [{
        name = "my dashboards";
        options.path = "/etc/grafana-dashboards";
      }];
    };
  };

  environment.etc."grafana-dashboards/traefik.json" = {
    source = ./dashboards/traefik.json;
    user = "grafana";
    group = "grafana";
    mode = "0644";
  };

  environment.etc."grafana-dashboards/grafana-traefik.json" = {
    source = ./dashboards/grafana-traefik.json;
    user = "grafana";
    group = "grafana";
    mode = "0644";
  };

  environment.etc."grafana-dashboards/node-exporter.json" = {
    source = ./dashboards/node-exporter.json;
    user = "grafana";
    group = "grafana";
    mode = "0644";
  };

  environment.etc."grafana-dashboards/promtail.json" = {
    source = ./dashboards/promtail.json;
    user = "grafana";
    group = "grafana";
    mode = "0644";
  };

  environment.etc."grafana-dashboards/gitea.json" = {
    source = ./dashboards/gitea.json;
    user = "grafana";
    group = "grafana";
    mode = "0644";
  };

  environment.etc."grafana-dashboards/postgres.json" = {
    source = ./dashboards/postgres.json;
    user = "grafana";
    group = "grafana";
    mode = "0644";
  };
}