{ lib, pkgs, ... }:
let
  inherit (builtins) readFile;
  inherit (lib) mkOption types;
in
{
  _class = "clan.service";

  manifest = {
    name = "amarth-services/zitadel";
    description = "Zitadel service module";
    categories = [ "System" "Identity" "IAM" ];
    readme = readFile ./README.md;
  };

  #==============================================================================================================
  # Controller configuration
  #==============================================================================================================
  roles.controller = {
    description = "A controller that manages the instance";

    interface = {
      options = {
        hostName = mkOption {
          type = types.str;
          example = "auth.example.com";
          description = ''
            The domain at which zitadel will be hosted
          '';
        };

        displayName = mkOption {
          type = types.str;
          example = "My awesome org";
          description = ''
            The Name of the zitadel organisation
          '';
        };

        emergencyAccessPublicKey = mkOption {
          type = types.str;
          example = "ssh-ed25519 ...";
          description = ''
            The public key with which you want access to
          '';
        };
      };
    };

    perInstance = { instanceName, settings, machine, roles, ... }: {
      nixosModule = { config, pkgs, inputs, system, ... }: 
      let
        terraform = inputs.terranix.lib.terranixConfiguration {
          inherit pkgs system;

          modules = [
            ({ config, ... }: {
              config = {
                terraform.required_providers.zitadel = {
                  source = "zitadel/zitadel";
                  version = "2.2.0";
                };

                provider.zitadel = {
                  domain = "localhost";
                  insecure = "true";
                  port = "8080";
                  jwt_profile_file = "local-token";
                };

                resource.zitadel_human_user.default = {
                  org_id = "";
                };
              };
            })
          ];
        };

        valuesYamlKey = "amarth/service/zitadel-${instanceName}-values.yml";
      in
      {
        assertions = 
        let
          inherit (lib) attrValues any;
        in
        [
          {
            assertion = 
              config.services.k3s.enable == true;
              # config.clan.inventory.instances
              # |> attrValues
              # |> any ({ module, ... }: module.name == "k3s");
            message = "This module requires k3s in order to run";
          }
        ];

        clan.core.vars.generators.zitadel = {
          share = false;

          files.masterKey = { deploy = true; secret = true; owner = "zitadel"; group = "zitadel"; mode = "0400"; };
          files.initialAdminPassword = { deploy = false; secret = false; };
          files.emailPassword = { deploy = false; secret = true; };

          runtimeInputs = with pkgs; [ pwgen ];

          script = ''
            pwgen 50 1 > "$out/initialAdminPassword"

            # https://zitadel.com/docs/self-hosting/manage/configure#masterkey
            # The master key has to be 32 bytes
            head -c 32 /dev/urandom > "$out/masterKey"

            touch $out/emailPassword
          '';
        };

        services.k3s.autoDeployCharts.zitadel = {
          name = "zitadel";
          repo = "https://charts.zitadel.com";
          version = "9.12.3";
          hash = "sha256-eSpqy2vK1tJp0Ci20R7+zGLfUDKPuKOz1iWyvawqEpc=";

          targetNamespace = "zitadel-system";
          createNamespace = true;

          values = config.sops.templates.${valuesYamlKey}.path;
        };

        sops = {
          templates.${valuesYamlKey}.content = ''
            zitadel:
              masterKey: ${config.sops.placeholder."vars/zitadel/masterKey"}
          '';
        };

        # services.zitadel = {
        #   enable = true;

        #   openFirewall = true;

        #   masterKeyFile = config.clan.core.vars.generators.zitadel.files.masterKey.path;
        #   tlsMode = "external";

        #   settings = {
        #     Port = 9092;

        #     ExternalDomain = settings.hostName;
        #     ExternalPort = 443;
        #     ExternalSecure = true;

        #     Metrics.Type = "otel";
        #     Tracing.Type = "otel";
        #     Telemetry.Enabled = true;

        #     SystemDefaults = {
        #       PasswordHasher.Hasher.Algorithm = "argon2id";
        #       SecretHasher.Hasher.Algorithm = "argon2id";
        #     };

        #     DefaultInstance = {
        #       PasswordComplexityPolicy = {
        #         MinLength = 20;
        #         HasLowercase = false;
        #         HasUppercase = false;
        #         HasNumber = false;
        #         HasSymbol = false;
        #       };
        #       LoginPolicy = {
        #         AllowRegister = false;
        #         ForceMFA = true;
        #       };
        #       LockoutPolicy = {
        #         MaxPasswordAttempts = 5;
        #         MaxOTPAttempts = 10;
        #       };
        #       SMTPConfiguration = {
        #         SMTP = {
        #           Host = "black-mail.nl:587";
        #           User = "info@amarth.cloud";
        #           Password = ""; #config.clan.core.vars.generators.zitadel.files.emailPassword.value;
        #         };
        #         FromName = "Amarth Zitadel";
        #       };
        #     };

        #     Database.postgres = {
        #       Host = "localhost";
        #       # Zitadel will report error if port is not set
        #       Port = 5432;
        #       Database = "zitadel";
        #       User = {
        #         Username = "zitadel";
        #         SSL.Mode = "disable";
        #       };
        #       Admin = {
        #         Username = "postgres";
        #         SSL.Mode = "disable";
        #       };
        #     };

        #     Machine.Identification = {
        #       PrivateIp.Enabled = true;

        #       # In the docs this uses a google service. I want a self hosted one
        #       # TODO :: Figure out how to self-host webhooks, if I want them at all
        #       Webhook.Enabled = false;
        #     };

        #     SystemAPIUsers = {
        #       emergencyAccess = {
        #         # Path = settings.emergencyAccessPublicKey;
        #         KeyData = settings.emergencyAccessPublicKey;

        #         # This is the default value
        #         # Memberships = [
        #         #   { MemberType = "System"; Roles = [ "SYSTEM_OWNER" ]; }
        #         # ];
        #       };
        #     };
        #   };

        #   steps.FirstInstance = {
        #     InstanceName = settings.hostName;

        #     Org = {
        #       Name = settings.displayName;
        #       Human = {
        #         UserName = "chris";
        #         FirstName = "Chris";
        #         LastName = "Kruining";
        #         Email = {
        #           Address = "chris@kruining.eu";
        #           Verified = true;
        #         };
        #         Password = config.clan.core.vars.generators.zitadel.files.initialAdminPassword.value;
        #       };
        #     };
        #   };
        # };

        # services.postgresql = {
        #   enable = true;
        #   authentication = ''
        #     # Generated file, do not edit!
        #     # TYPE  DATABASE  USER  ADDRESS       METHOD
        #     local   all       all                 trust
        #     host    all       all   127.0.0.1/32  trust
        #     host    all       all   ::1/128       trust
        #   '';
        #   ensureDatabases = [ "zitadel" ];
        #   ensureUsers = [
        #     {
        #       name = "zitadel";
        #       ensureDBOwnership = true;
        #     }
        #   ];
        # };
      };
    };
  };

  #==============================================================================================================
  # Peer configuration
  #==============================================================================================================
  roles.peer = {
    description = "A peer";

    interface = {
      options = {};
    };

    perInstance = { instanceName, settings, machine, roles, ... }: {
      nixosModule = {};
    };
  };
}