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

{
    imports =
        [
        ../../modules/base.nix
        ];

    networking = {
        hostName = "Spacebar-monitoring";
        interfaces.ens18.ipv4.addresses = [ { 
            address = "192.168.1.99";
            prefixLength = 24;
        } ];
        interfaces.ens19.ipv4.addresses = [ {
            address = "10.10.11.99";
            prefixLength = 16;
        } ];
    };

    services = {
        prometheus = {
            enable = true;
            stateDir = "prometheus";
            extraFlags = [
                "--storage.local.retention 8760h"
                "--storage.local.series-file-shrink-ratio 0.3"
                "--storage.local.memory-chunks 2097152"
                "--storage.local.max-chunks-to-persist 1048576"
                "--storage.local.index-cache-size.fingerprint-to-metric 2097152"
                "--storage.local.index-cache-size.fingerprint-to-timerange 1048576"
                "--storage.local.index-cache-size.label-name-to-label-values 2097152"
                "--storage.local.index-cache-size.label-pair-to-fingerprints 41943040"
            ];
            # alertmanagerURL = [ "http://localhost:9093" ];
            # rules = [
            #     ''
            #     ALERT node_down
            #     IF up == 0
            #     FOR 5m
            #     LABELS {
            #         severity="page"
            #     }
            #     ANNOTATIONS {
            #         summary = "{{$labels.alias}}: Node is down.",
            #         description = "{{$labels.alias}} has been down for more than 5 minutes."
            #     }
            #     ALERT node_systemd_service_failed
            #     IF node_systemd_unit_state{state="failed"} == 1
            #     FOR 4m
            #     LABELS {
            #         severity="page"
            #     }
            #     ANNOTATIONS {
            #         summary = "{{$labels.alias}}: Service {{$labels.name}} failed to start.",
            #         description = "{{$labels.alias}} failed to (re)start service {{$labels.name}}."
            #     }
            #     ALERT node_filesystem_full_90percent
            #     IF sort(node_filesystem_free{device!="ramfs"} < node_filesystem_size{device!="ramfs"} * 0.1) / 1024^3
            #     FOR 5m
            #     LABELS {
            #         severity="page"
            #     }
            #     ANNOTATIONS {
            #         summary = "{{$labels.alias}}: Filesystem is running out of space soon.",
            #         description = "{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} got less than 10% space left on its filesystem."
            #     }
            #     ALERT node_filesystem_full_in_4h
            #     IF predict_linear(node_filesystem_free{device!="ramfs"}[1h], 4*3600) <= 0
            #     FOR 5m
            #     LABELS {
            #         severity="page"
            #     }
            #     ANNOTATIONS {
            #         summary = "{{$labels.alias}}: Filesystem is running out of space in 4 hours.",
            #         description = "{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} is running out of space of in approx. 4 hours"
            #     }
            #     ALERT node_filedescriptors_full_in_3h
            #     IF predict_linear(node_filefd_allocated[1h], 3*3600) >= node_filefd_maximum
            #     FOR 20m
            #     LABELS {
            #         severity="page"
            #     }
            #     ANNOTATIONS {
            #         summary = "{{$labels.alias}} is running out of available file descriptors in 3 hours.",
            #         description = "{{$labels.alias}} is running out of available file descriptors in approx. 3 hours"
            #     }
            #     ALERT node_load1_90percent
            #     IF node_load1 / on(alias) count(node_cpu{mode="system"}) by (alias) >= 0.9
            #     FOR 1h
            #     LABELS {
            #         severity="page"
            #     }
            #     ANNOTATIONS {
            #         summary = "{{$labels.alias}}: Running on high load.",
            #         description = "{{$labels.alias}} is running with > 90% total load for at least 1h."
            #     }
            #     ALERT node_cpu_util_90percent
            #     IF 100 - (avg by (alias) (irate(node_cpu{mode="idle"}[5m])) * 100) >= 90
            #     FOR 1h
            #     LABELS {
            #         severity="page"
            #     }
            #     ANNOTATIONS {
            #         summary = "{{$labels.alias}}: High CPU utilization.",
            #         description = "{{$labels.alias}} has total CPU utilization over 90% for at least 1h."
            #     }
            #     ALERT node_ram_using_90percent
            #     IF node_memory_MemFree + node_memory_Buffers + node_memory_Cached < node_memory_MemTotal * 0.1
            #     FOR 30m
            #     LABELS {
            #         severity="page"
            #     }
            #     ANNOTATIONS {
            #         summary="{{$labels.alias}}: Using lots of RAM.",
            #         description="{{$labels.alias}} is using at least 90% of its RAM for at least 30 minutes now.",
            #     }
            #     ALERT node_swap_using_80percent
            #     IF node_memory_SwapTotal - (node_memory_SwapFree + node_memory_SwapCached) > node_memory_SwapTotal * 0.8
            #     FOR 10m
            #     LABELS {
            #         severity="page"
            #     }
            #     ANNOTATIONS {
            #         summary="{{$labels.alias}}: Running out of swap soon.",
            #         description="{{$labels.alias}} is using 80% of its swap space for at least 10 minutes now."
            #     }
            #     ''
            # ];
            scrapeConfigs = [
                {
                    job_name = "node";
                    scrape_interval = "5s";
                    static_configs = [
                        {
                            targets = [
                                "localhost:9100"
                            ];
                            labels = {
                                alias = "monitoring";
                            };
                        }
                        {
                            targets = [
                                "192.168.1.2:9100"
                            ];
                            labels = {
                                alias = "nginx";
                            };
                        }
                        {
                            targets = [
                                "192.168.1.3:9100"
                            ];
                            labels = {
                                alias = "email";
                            };
                        }
                        {
                            targets = [
                                "192.168.1.4:9100"
                            ];
                            labels = {
                                alias = "postgres";
                            };
                        }
                        # {
                        #     targets = [
                        #         "192.168.1.5:9100"
                        #     ];
                        #     labels = {
                        #         alias = "synapse";
                        #     };
                        # }
                    ];
                }
            ];
            alertmanager = {
                enable = false;
                listenAddress = "0.0.0.0";
                configuration = {
                    "global" = {
                        "smtp_smarthost" = "smtp.example.com:587";
                        "smtp_from" = "alertmanager@example.com";
                    };
                    "route" = {
                        "group_by" = [ "alertname" "alias" ];
                        "group_wait" = "30s";
                        "group_interval" = "2m";
                        "repeat_interval" = "4h";
                        "receiver" = "team-admins";
                    };
                    "receivers" = [
                        {
                        "name" = "team-admins";
                        "email_configs" = [
                            {
                            "to" = "devnull@example.com";
                            "send_resolved" = true;
                            }
                        ];
                        "webhook_configs" = [
                            {
                            "url" = "https://example.com/prometheus-alerts";
                            "send_resolved" = true;
                            }
                        ];
                        }
                    ];
                };
            };
        };
        grafana = {
            enable = true;
            addr = "0.0.0.0";
            domain = "grafana.spacebar.chat";
            settings = {
                server = {
                    root_url = "https://grafana.spacebar.chat/";
                    enable_gzip = true;
                    domain = "grafana.spacebar.chat";

                };
                analytics.reporting_enabled = false;
                security.secret_key = secrets.grafana.secret_key;
            };
            provision = {
                datasources.settings = {
                    datasources = [
                         {
                            name = "Prometheus";
                            type = "prometheus";
                            url = "http://localhost:9090";
                            access = "proxy";
                            isDefault = true;
                        }
                    ];
                };
                dashboards.settings = {
                    apiVersion = 1;
                    providers = [
                        {
                            name = "Prometheus 2.0 Overview";
                            revision = "1";
                            folder = "prometheus";
                            uid = "prometheus2";
                            type = "file";
                            options = {
                                path = pkgs.fetchurl {
                                    url = "https://grafana.com/api/dashboards/3662/revisions/2/download";
                                    hash = "sha256:";
                                };
                            };
                        }
                        {
                            name = "Node Exporter Full";
                            revision = "31";
                            folder = "prometheus";
                            uid = "node-exporter-full";
                            type = "file";
                            options = {
                                path = pkgs.fetchurl {
                                    url = "https://grafana.com/api/dashboards/1860/revisions/31/download";
                                    hash = "sha256:";
                                };
                            };
                        }
                    ];
                };
            };
        };
    };

    system.stateVersion = "22.11"; # DO NOT EDIT!
}