{
  lib,
  pkgs,
  config,
  ...
}:
let
  inherit (lib) mkIf mkMerge;
  sources = import ../../../npins;
  inherit (import "${sources.nix-templating}/lib.nix" { inherit pkgs; })
    fileContents
    template_text
    ;
in
{
  imports = with sources; [
    ./options.nix
    "${vars}/options.nix"
    "${vars}/backends/on-machine.nix"
  ];

  config = mkMerge [
    (mkIf
      (
        config.fediversity.garage.enable
        && config.fediversity.attic.s3AccessKeyFile != null
        && config.fediversity.attic.s3SecretKeyFile != null
      )
      {
        fediversity.garage = {
          ensureBuckets = {
            attic = {
              website = true;
              # TODO: these are too broad, after getting everything to work narrow it down to the domain we actually want
              corsRules = {
                enable = true;
                allowedHeaders = [ "*" ];
                allowedMethods = [ "GET" ];
                allowedOrigins = [ "*" ];
              };
            };
          };
          ensureKeys = {
            attic = {
              inherit (config.fediversity.attic) s3AccessKeyFile s3SecretKeyFile;
              ensureAccess = {
                attic = {
                  read = true;
                  write = true;
                  owner = true;
                };
              };
            };
          };
        };
      }
    )
    (mkIf config.fediversity.attic.enable {

      services.postgresql = {
        enable = true;
        authentication = lib.mkForce ''
          local all all trust
        '';
        ensureDatabases = [
          "atticd"
        ];
        ensureUsers = [
          {
            name = "atticd";
            ensureDBOwnership = true;
          }
        ];
      };

      # open up access to the mastodon web interface. 80 is necessary if only for ACME
      networking.firewall.allowedTCPPorts = [
        80
        443
        8080
      ];

      vars.generators.attic = {
        runtimeInputs = [ pkgs.openssl ];
        files.token.secret = true;
        script = ''
          genrsa -traditional 4096 | base64 -w0 > $out/token
        '';
      };

      services.atticd = {
        enable = true;
        # one `monolithic` and any number of `api-server` nodes
        mode = "monolithic";

        environmentFile = "${
          template_text {
            name = "attic.env";
            outPath = "./attic.env";
            text = ''
              ATTIC_SERVER_TOKEN_RS256_SECRET_BASE64=${fileContents config.vars.generators.attic.files.token.path}
              AWS_ACCESS_KEY_ID=$(cat ${config.fediversity.attic.s3AccessKeyFile})
              AWS_SECRET_ACCESS_KEY=$(cat ${config.fediversity.attic.s3SecretKeyFile})
            '';
          }
        }/bin/attic.env";

        # https://github.com/zhaofengli/attic/blob/main/server/src/config-template.toml
        settings = {
          # Socket address to listen on
          # listen = "[::]:8080";
          listen = "0.0.0.0:8080";
          # listen = "127.0.0.1:8080";

          # Allowed `Host` headers
          #
          # This _must_ be configured for production use. If unconfigured or the
          # list is empty, all `Host` headers are allowed.
          allowed-hosts = [ ];

          # The canonical API endpoint of this server
          #
          # This is the endpoint exposed to clients in `cache-config` responses.
          #
          # This _must_ be configured for production use. If not configured, the
          # API endpoint is synthesized from the client's `Host` header which may
          # be insecure.
          #
          # The API endpoint _must_ end with a slash (e.g., `https://domain.tld/attic/`
          # not `https://domain.tld/attic`).
          api-endpoint = "https://${config.fediversity.attic.domain}/";

          # Whether to soft-delete caches
          #
          # If this is enabled, caches are soft-deleted instead of actually
          # removed from the database. Note that soft-deleted caches cannot
          # have their names reused as long as the original database records
          # are there.
          #soft-delete-caches = false;

          # Whether to require fully uploading a NAR if it exists in the global cache.
          #
          # If set to false, simply knowing the NAR hash is enough for
          # an uploader to gain access to an existing NAR in the global
          # cache.
          #require-proof-of-possession = true;

          # Database connection
          database = {
            # Connection URL
            #
            # For production use it's recommended to use PostgreSQL.
            # url = "postgresql:///atticd:password@127.0.0.1:5432/atticd";
            url = "postgresql:///atticd?host=/run/postgresql";

            # Whether to enable sending on periodic heartbeat queries
            #
            # If enabled, a heartbeat query will be sent every minute
            #heartbeat = false;
          };

          # File storage configuration
          storage = {
            # Storage type
            #
            # Can be "local" or "s3".
            type = "s3";

            # ## Local storage

            # The directory to store all files under
            # path = "%storage_path%";

            # ## S3 Storage (set type to "s3" and uncomment below)

            # The AWS region
            region = "garage";

            # The name of the bucket
            bucket = "attic";

            # Custom S3 endpoint
            #
            # Set this if you are using an S3-compatible object storage (e.g., Minio).
            endpoint = config.fediversity.garage.api.url;

            # Credentials
            #
            # If unset, the credentials are read from the `AWS_ACCESS_KEY_ID` and
            # `AWS_SECRET_ACCESS_KEY` environment variables.
            # storage.credentials = {
            #   access_key_id = "";
            #   secret_access_key = "";
            # };
          };

          # Data chunking
          #
          # Warning: If you change any of the values here, it will be
          # difficult to reuse existing chunks for newly-uploaded NARs
          # since the cutpoints will be different. As a result, the
          # deduplication ratio will suffer for a while after the change.
          chunking = {
            # The minimum NAR size to trigger chunking
            #
            # If 0, chunking is disabled entirely for newly-uploaded NARs.
            # If 1, all NARs are chunked.
            nar-size-threshold = 65536; # chunk files that are 64 KiB or larger

            # The preferred minimum size of a chunk, in bytes
            min-size = 16384; # 16 KiB

            # The preferred average size of a chunk, in bytes
            avg-size = 65536; # 64 KiB

            # The preferred maximum size of a chunk, in bytes
            max-size = 262144; # 256 KiB
          };

          # Compression
          compression = {
            # Compression type
            #
            # Can be "none", "brotli", "zstd", or "xz"
            type = "zstd";

            # Compression level
            #level = 8;
          };

          # Garbage collection
          garbage-collection = {
            # The frequency to run garbage collection at
            #
            # By default it's 12 hours. You can use natural language
            # to specify the interval, like "1 day".
            #
            # If zero, automatic garbage collection is disabled, but
            # it can still be run manually with `atticd --mode garbage-collector-once`.
            interval = "12 hours";

            # Default retention period
            #
            # Zero (default) means time-based garbage-collection is
            # disabled by default. You can enable it on a per-cache basis.
            #default-retention-period = "6 months";
          };

          # jwt = {
          # WARNING: Changing _anything_ in this section will break any existing
          # tokens. If you need to regenerate them, ensure that you use the the
          # correct secret and include the `iss` and `aud` claims.

          # JWT `iss` claim
          #
          # Set this to the JWT issuer that you want to validate.
          # If this is set, all received JWTs will validate that the `iss` claim
          # matches this value.
          #token-bound-issuer = "some-issuer";

          # JWT `aud` claim
          #
          # Set this to the JWT audience(s) that you want to validate.
          # If this is set, all received JWTs will validate that the `aud` claim
          # contains at least one of these values.
          #token-bound-audiences = ["some-audience1", "some-audience2"];
          # };

          # jwt.signing = {
          # You must configure JWT signing and verification inside your TOML configuration by setting one of the following options in the [jwt.signing] block:
          # * token-rs256-pubkey-base64
          # * token-rs256-secret-base64
          # * token-hs256-secret-base64
          # or by setting one of the following environment variables:
          # * ATTIC_SERVER_TOKEN_RS256_PUBKEY_BASE64
          # * ATTIC_SERVER_TOKEN_RS256_SECRET_BASE64
          # * ATTIC_SERVER_TOKEN_HS256_SECRET_BASE64
          # Options will be tried in that same order (configuration options first, then environment options if none of the configuration options were set, starting with the respective RSA pubkey option, the RSA secret option, and finally the HMAC secret option). The first option that is found will be used.
          # If an RS256 pubkey (asymmetric RSA PEM PKCS1 public key) is provided, it will only be possible to verify received JWTs, and not sign new JWTs.
          # If an RS256 secret (asymmetric RSA PEM PKCS1 private key) is provided, it will be used for both signing new JWTs and verifying received JWTs.
          # If an HS256 secret (symmetric HMAC secret) is provided, it will be used for both signing new JWTs and verifying received JWTs.

          # JWT RS256 secret key
          #
          # Set this to the base64-encoded private half of an RSA PEM PKCS1 key.
          # TODO
          # You can also set it via the `ATTIC_SERVER_TOKEN_RS256_SECRET_BASE64`
          # environment variable.
          # token-rs256-secret-base64 = "%token_rs256_secret_base64%";

          # JWT HS256 secret key
          #
          # Set this to the base64-encoded HMAC secret key.
          # You can also set it via the `ATTIC_SERVER_TOKEN_HS256_SECRET_BASE64`
          # environment variable.
          #token-hs256-secret-base64 = "";
          # };
        };
      };
    })
  ];
}