{ lib, config, ... }:
let
  nixosModules = config.flake.modules.nixos;

  sourceControlScopeType = lib.types.enum [
    "personal"
    "work"
  ];

  emailProviderType = lib.types.enum [
    "mxrouting"
    "office365"
  ];

  emailType = lib.types.submodule (
    { ... }:
    {
      options = {
        address = lib.mkOption {
          type = lib.types.str;
        };

        primary = lib.mkOption {
          type = lib.types.bool;
          default = false;
        };

        type = lib.mkOption {
          type = emailProviderType;
        };

        scope = lib.mkOption {
          type = lib.types.nullOr sourceControlScopeType;
          default = null;
        };
      };
    }
  );

  sourceControlAccountType = lib.types.submodule (
    { ... }:
    {
      options.projectScope = lib.mkOption {
        type = sourceControlScopeType;
        default = "personal";
      };
    }
  );

  accountType = lib.types.submodule (
    { config, ... }:
    {
      options = {
        name = lib.mkOption {
          type = lib.types.str;
        };

        realName = lib.mkOption {
          type = lib.types.str;
        };

        homeDirectory = lib.mkOption {
          type = lib.types.str;
          default = "/home/${config.name}";
        };

        nixosConfigurationPath = lib.mkOption {
          type = lib.types.str;
          default = "${config.homeDirectory}/.config/nixos";
        };

        emails = lib.mkOption {
          type = lib.types.attrsOf emailType;
          default = { };
        };

        sourceControl = lib.mkOption {
          type = sourceControlAccountType;
          default = { };
        };

        primaryEmail = lib.mkOption {
          type = lib.types.nullOr emailType;
          description = "Derived primary email entry for this user.";
          default =
            let
              emails = builtins.attrValues config.emails;
            in
            lib.findFirst (email: email.primary) null emails;
        };
      };
    }
  );

  displayType = lib.types.submodule (
    { ... }:
    {
      options = {
        primary = lib.mkOption {
          type = lib.types.bool;
          default = false;
        };

        x = lib.mkOption {
          type = lib.types.int;
          default = 0;
        };

        y = lib.mkOption {
          type = lib.types.int;
          default = 0;
        };

        scale = lib.mkOption {
          type = lib.types.nullOr lib.types.float;
          default = null;
        };

        width = lib.mkOption {
          type = lib.types.nullOr lib.types.int;
          default = null;
        };

        height = lib.mkOption {
          type = lib.types.nullOr lib.types.int;
          default = null;
        };

        refresh = lib.mkOption {
          type = lib.types.nullOr lib.types.float;
          default = null;
        };
      };
    }
  );

  sourceControlMachineKeyType = lib.types.submodule (
    { ... }:
    {
      options = {
        publicKey = lib.mkOption {
          type = lib.types.nullOr lib.types.str;
          default = null;
        };

        privateKeyPath = lib.mkOption {
          type = lib.types.nullOr lib.types.str;
          default = null;
        };
      };
    }
  );

  sourceControlMachineType = lib.types.submodule (
    { ... }:
    {
      options = {
        personal = lib.mkOption {
          type = lib.types.nullOr sourceControlMachineKeyType;
          default = null;
        };

        work = lib.mkOption {
          type = lib.types.nullOr sourceControlMachineKeyType;
          default = null;
        };
      };
    }
  );

  machineType = lib.types.submodule (
    { name, config, ... }:
    {
      options = {
        name = lib.mkOption {
          type = lib.types.str;
          default = name;
        };

        module = lib.mkOption {
          type = lib.types.deferredModule;
          default = nixosModules.${name};
        };

        stateVersion = lib.mkOption {
          type = lib.types.str;
        };

        hmStateVersion = lib.mkOption {
          type = lib.types.str;
          default = config.stateVersion;
        };

        displays = lib.mkOption {
          type = lib.types.attrsOf displayType;
          default = { };
        };

        sourceControl = lib.mkOption {
          type = sourceControlMachineType;
          default = { };
        };

        syncthingId = lib.mkOption {
          type = lib.types.nullOr lib.types.str;
          default = null;
        };

        portable = lib.mkOption {
          type = lib.types.bool;
          default = false;
        };
      };
    }
  );
in
{
  options.repo = {
    account = lib.mkOption {
      type = accountType;
    };

    machines = lib.mkOption {
      type = lib.types.attrsOf machineType;
      default = { };
    };

    desktop = lib.mkOption {
      type = lib.types.raw;
      default = { };
    };

    services = lib.mkOption {
      type = lib.types.raw;
      default = { };
    };

    theme = lib.mkOption {
      type = lib.types.raw;
      default = { };
    };
  };

  config.flake.modules.nixos.meta =
    { ... }:
    {
      options.meta.machine = lib.mkOption {
        type = machineType;
      };
    };

}