{ pkgs, lib, config, tf, inputs', ... }:
let
  inherit (lib)
    singleton;
in
{
  systemd.services.hashicorp-vault-agent =
    let
      config = pkgs.writeText "hashicorp-vault-agent-tmpfiles.d" ''
        d /run/secrets         0750 root root 0
        x /run/secrets/monitor 0755 root root -
        d /run/secrets/monitor 0755 root root 0
        x /run/secrets/klipper 0755 root root -
        d /run/secrets/klipper 0755 root root 0
      '';
    in
      {
        preStart = "systemd-tmpfiles --create " + config;
        postStop = "systemd-tmpfiles --clean " + config;

        requires = [ "vault-unsealed.service" ];
        after = [ "vault-unsealed.service" ];
      };

  services.hashicorp.vault-agent = {
    enable = true;
    package = inputs'.nixpkgs-hashicorp.legacyPackages.${pkgs.stdenv.system}.vault;

    command = "agent";

    extraPackages = with pkgs; [
      sudo
      getent
    ];

    settings = {
      vault = {
        address = "https://vault.in.redalder.org:8200";
        retry = {
          num_retries = 5;
        };
      };

      auto_auth = {
        method = singleton {
          "approle" = {
            mount_path = "auth/approle";
            config = {
              role_id_file_path = "/var/secrets/approle.roleid";
              secret_id_file_path = "/var/secrets/approle.secretid";
              remove_secret_id_file_after_reading = false;
            };
          };
        };

        sink = singleton {
          type = "file";
          config = {
            path = "/run/secrets/vault-token";
          };
        };
      };

      template = [
        {
          source = pkgs.writeText "id_ed_camera" ''
            {{ with secret "kv/data/homelab-1/blowhole/id_ed_camera" }}{{ .Data.data.private }}{{ end }}
          '';
          destination = "/run/secrets/id_ed_camera";
          command = pkgs.writeShellScript "id_ed_camera-command" ''
            export PATH=${pkgs.util-linux}/bin:$PATH
            chown root:root /run/secrets/id_ed_camera
            chmod 600 /run/secrets/id_ed_camera
          '';
        }
      ];
    };
  };
}