feat(nix): refine meta module options for users and hosts

nix/meta.nix

@@ -5,17 +5,53 @@
   ...
 }:
 let
-  inherit (lib.options) mkOption;
+  inherit (lib.options) mkOption mkEnableOption;
+  inherit (cfg.lib.options) mkStrOption;
   inherit (lib.types)
+    listOf
     path
     lazyAttrsOf
     raw
     deferredModule
+    submodule
     ;
   inherit (inputs.flake-parts.lib) mkSubmoduleOptions;
   inherit (cfg.lib.attrsets) firstAttrNameMatching;
   cfg = config.flake;
-  username = firstAttrNameMatching (_: v: v.primary or false) cfg.manifest.users;
+  userOpts = submodule {
+    options = {
+      username = mkStrOption "";
+      primary = mkEnableOption "";
+      name = mkStrOption "";
+      email = mkStrOption "";
+      shell = mkStrOption "";
+      pubkey = mkStrOption "";
+    };
+  };
+  hostOpts = submodule {
+    options = {
+      graphical = mkEnableOption "";
+      machine = {
+        platform = mkStrOption "";
+        gpu = mkStrOption "";
+        root.drive = mkStrOption "";
+        monitors = mkOption {
+          type = listOf submodule {
+            options = {
+              id = mkStrOption "";
+              scale = mkStrOption "";
+              resolution = mkStrOption "";
+              refresh-rate = mkStrOption "";
+            };
+          };
+        };
+      };
+      extraCfg = mkOption {
+        type = deferredModule;
+        default = { };
+      };
+    };
+  };
 in
 {
   options.flake = mkSubmoduleOptions {
@@ -30,19 +66,39 @@ in
         readOnly = true;
       };
     };
-    admin = mkOption {
-      type = lazyAttrsOf raw;
-      default = { };
-    };
     homes = mkOption {
       type = lazyAttrsOf deferredModule;
       default = { };
     };
-  };
-  config.flake = {
-    paths.secrets = cfg.paths.root + "/secrets";
-    admin = cfg.manifest.users.${username} // {
-      inherit username;
+    manifest = mkOption {
+      type = submodule {
+        options = {
+          users = mkOption {
+            type = lazyAttrsOf userOpts;
+            default = { };
+          };
+          hosts = mkOption {
+            # hosts.nixos, hosts.darwin, etc.
+            type = lazyAttrsOf (lazyAttrsOf hostOpts);
+            default = { };
+          };
+        };
+      };
+    };
+    # Helper Option
+    admin = mkOption {
+      type = userOpts;
+      default = { };
     };
   };
+  config.flake =
+    let
+      username = firstAttrNameMatching (_: v: v.primary or false) cfg.manifest.users;
+    in
+    {
+      paths.secrets = cfg.paths.root + "/secrets";
+      admin = cfg.manifest.users.${username} // {
+        inherit username;
+      };
+    };
 }