{ lib, config, pkgs, ... }:
let
  cfg = config.services.vm_grafana;
in
{
  options.services.vm_grafana = {
    enable = lib.mkEnableOption "Enable minimal config";
    proxy_ip = lib.mkOption {
      type = lib.types.str;
      description = "The Nginx proxy IP address";
    };
    pgsql_ip = lib.mkOption {
      type = lib.types.str;
      description = "The PostgreSQL host IP address";
    };
  };
    config = lib.mkIf cfg.enable {
    services.rsyslogd = {
      enable = true;
      extraConfig = ''
        ruleset(name="remote"){
          action(type="omfwd" Target="localhost" Port="1514" Protocol="tcp" Template="RSYSLOG_SyslogProtocol23Format" TCP_Framing="octet-counted")
        }

        module(load="imudp")
        input(type="imudp" port="514" ruleset="remote")

        module(load="imtcp")
        input(type="imtcp" port="514" ruleset="remote")
      '';
    };  
    services.influxdb2 = {
      enable = true;
    };  
    services.grafana = {
      enable = true;
      settings = {
        server = {
          protocol = "http";
          http_addr = "${config.services.vm.vm_ip}";
          http_port = 3000;
          domain = "logs.le43.eu";
          root_url = "https://logs.le43.eu";
          serve_from_sub_path = false;
        };
        database = {
          type     = "postgres";
          host     = "${cfg.pgsql_ip}:5432";
          name     = "grafana";
          user     = "grafana";
          password = "\$__file{/run/secrets/grafana/database_secret}";
        };
        auth = {
          signout_redirect_url = https://authentik.le43.eu/application/o/grafana/end-session/;
          oauth_auto_login = true;
        };
        "oauth.generic_oauth" = {
          name = "authentik";
          enabled = true;
          client_id = "9HV82G8F92Jcbw4nP8eppMcPpLcAw5uYpejfReLy";
          client_secret = "\$__file{/run/secrets/grafana/client_secret}";
          scopes = [
            "openid"
            "email"
            "profile"
          ];
          auth_url = "https://authentik.le43.eu/application/o/authorize/";
          token_url = "https://authentik.le43.eu/application/o/token/";
          api_url = "https://authentik.le43.eu/application/o/userinfo/";
          role_attribute_path = "contains(groups, 'admin') && 'Admin' || 'Viewer'";
        };
      };
    };
    services.prometheus = {
      enable = true;
      port = 9001;
      scrapeConfigs = [
        {
          job_name = "grafana";
          static_configs = [{
            targets = [ "127.0.0.1:9002" ];
          }];
        }
        {
          job_name = "nginx";
          static_configs = [{
            targets = [ "${cfg.proxy_ip}:9002" ];
          }];
        }
        {
          job_name = "redis";
          static_configs = [{
            targets = [ "192.168.1.16:9002" ];
          }];
        }
        {
          job_name = "authentik";
          static_configs = [{
            targets = [ "192.168.1.25:9002" ];
          }];
        }
      ];
      exporters = {
        node = {
          enable = true;
          enabledCollectors = [ "systemd" ];
          port = 9002;
        };
      };
    };
    services.loki = {
      enable = true;
      configuration = {
        server.http_listen_port = 3100;
        server.grpc_listen_port = 9096;
        auth_enabled = false;
        ingester = {
          lifecycler = {
            address = "127.0.0.1";
            ring = {
              kvstore = {
                store = "inmemory";
              };
              replication_factor = 1;
            };
          };
          chunk_idle_period = "1h";
          max_chunk_age = "1h";
          chunk_target_size = 999999;
          chunk_retain_period = "30s";
        };
        schema_config = {
          configs = [{
            from = "2022-06-06";
            store = "boltdb-shipper";
            object_store = "filesystem";
            schema = "v13";
            index = {
              prefix = "index_";
              period = "24h";
            };
          }];
        };
        storage_config = {
          boltdb_shipper = {
            active_index_directory = "/var/lib/loki/boltdb-shipper-active";
            cache_location = "/var/lib/loki/boltdb-shipper-cache";
            cache_ttl = "24h";
          };

          filesystem = {
            directory = "/var/lib/loki/chunks";
          };
        };

        limits_config = {
          reject_old_samples = true;
          reject_old_samples_max_age = "168h";
          allow_structured_metadata = false;
        };

        table_manager = {
          retention_deletes_enabled = false;
          retention_period = "0s";
        };
        compactor = {
          working_directory = "/var/lib/loki";
          compactor_ring = {
            kvstore = {
              store = "inmemory";
            };
          };
        };
      };
    };
    services.promtail = {
      enable = true;
      configuration = {
        server = {
          http_listen_port = 3101;
          grpc_listen_port = 9095;
        };
        positions = {
          filename = "/tmp/positions.yaml";
        };
        clients = [{
          url = "http://127.0.0.1:3100/loki/api/v1/push";
        }];
        scrape_configs = [
          {
            job_name = "syslog";
            syslog = {
              listen_address  = "0.0.0.0:1514";
              listen_protocol = "tcp";
              idle_timeout = "60s";
              labels = {
                job = "syslog";
              };
            };
            relabel_configs = [
              {
                source_labels = [ "__syslog_message_hostname" ];
                target_label = "host";
              }
              {
                source_labels = [ "__syslog_message_hostname" ];
                target_label = "hostname";
              }
              {
                source_labels = [ "__syslog_message_severity" ];
                target_label = "level";
              }
              {
                source_labels = [ "__syslog_message_app_name" ];
                target_label = "application";
              }
              {
                source_labels = [ "__syslog_message_facility" ];
                target_label = "facility";
              }
              {
                source_labels = [ "__syslog_connection_hostname" ];
                target_label = "connection_hostname";
              }
            ];
          }
        ];
      };
    };

    # Open ports in the firewall.
    networking.firewall.allowedTCPPorts = [ 3000 3100 3101 8086 9001 1514 514 ];
    networking.firewall.allowedUDPPorts = [ 514 ];
  };
}