{ lib, config, ... }:
let
  cfg = config.monitoring;
in
{
  config = lib.mkIf (cfg.monitorAll && config.services.matrix-synapse.enable) {
    services.matrix-synapse.settings.enable_metrics = true;
    services.matrix-synapse.settings.listeners = [
      {
        type = "metrics";
        port = 9200;
        tls = false;
        resources = [ ];
      }
    ];

    services.matrix-synapse.workers = (
      lib.listToAttrs (
        lib.imap (index: workerName: {
          name = workerName;
          value = {
            worker_listeners = [
              {
                type = "metrics";
                port = 9200 + index + 1;
                resources = [ ];
              }
            ];
          };
        }) config.monitoring.synapse.workerNames
      )
    );

    services.prometheus.scrapeConfigs =
      [
        {
          job_name = "synapse-main";
          scrape_interval = "${toString cfg.prometheusScrapeInterval}s";
          static_configs = [
            {
              targets = [ "localhost:9200" ];
              labels.instance = "synapse";
            }
          ];
          metrics_path = "_synapse/metrics";
        }
      ]
      ++ lib.flatten (
        lib.imap (index: workerName: {
          job_name = "synapse-${workerName}s";
          scrape_interval = "${toString cfg.prometheusScrapeInterval}s";
          static_configs = [
            {
              targets = [ "localhost:${toString (9200 + index + 1)}" ];
              labels.instance = "synapse";
            }
          ];
          metrics_path = "_synapse/metrics";
        }) config.monitoring.synapse.workerNames
      );

    services.grafana.provision.dashboards.settings = {
      apiVersion = 1;
      providers = [
        {
          name = "matrix-synapse";
          orgId = 1;
          type = "file";
          options = {
            path = builtins.fetchurl {
              url = "https://raw.githubusercontent.com/element-hq/synapse/master/contrib/grafana/synapse.json";
              sha256 = "07qlr0waw9phmyd38bv22bn5v303w3397b89l44l3lzwhpnhs16s";
            };
          };
        }
      ];
    };

  };
}