{ logNginx, lokiAddress, config, pkgs, ... }:

let
  basecfg = ''
    server:
      http_listen_port: 9080
      grpc_listen_port: 0
    
    positions:
      filename: /tmp/positions.yaml
    
    clients:
      - url: http://${lokiAddress}:3100/loki/api/v1/push
  '';

  withNginx = ''
    scrape_configs:
      - job_name: journal
        journal:
          max_age: 12h
          labels:
            job: systemd-journal
            host: ${config.networking.hostName}
        relabel_configs:
          - source_labels: ["__journal__systemd_unit"]
            target_label: "unit"
      - job_name: nginx
        static_configs:
        - targets:
            - localhost
          labels:
            job: nginx
            __path__: /var/log/nginx/*log
  '';

  withoutNginx = ''
    scrape_configs:
      - job_name: journal
        journal:
          max_age: 12h
          labels:
            job: systemd-journal
            host: ${config.networking.hostName}
        relabel_configs:
          - source_labels: ["__journal__systemd_unit"]
            target_label: "unit"
  '';
in
pkgs.writeText "promtailcfg.yaml" (if logNginx then ''${basecfg}${withNginx}'' else ''${basecfg}${withoutNginx}'')