remove duplicated code

modelgen/helpers.py

@@ -0,0 +1,72 @@
+"""
+Type Helpers
+
+Utilities for type introspection and resolution.
+Used by generators and loaders.
+"""
+
+import dataclasses as dc
+from enum import Enum
+from typing import Any, Union, get_args, get_origin
+
+
+def unwrap_optional(type_hint: Any) -> tuple[Any, bool]:
+    """Unwrap Optional[T] -> (T, True) or (T, False) if not optional."""
+    origin = get_origin(type_hint)
+    if origin is Union:
+        args = [a for a in get_args(type_hint) if a is not type(None)]
+        return (args[0] if args else str, True)
+    return (type_hint, False)
+
+
+def get_origin_name(type_hint: Any) -> str | None:
+    """Get origin type name: 'dict', 'list', or None."""
+    origin = get_origin(type_hint)
+    if origin is dict:
+        return "dict"
+    if origin is list:
+        return "list"
+    return None
+
+
+def get_type_name(type_hint: Any) -> str | None:
+    """Get type name for special types like UUID, datetime."""
+    if hasattr(type_hint, "__name__"):
+        return type_hint.__name__
+    return None
+
+
+def get_list_inner(type_hint: Any) -> str:
+    """Get inner type of List[T]."""
+    args = get_args(type_hint)
+    if args and args[0] in (str, int, float, bool):
+        return {str: "str", int: "int", float: "float", bool: "bool"}[args[0]]
+    return "str"
+
+
+def get_field_default(field: dc.Field) -> Any:
+    """Get default value from dataclass field."""
+    if field.default is not dc.MISSING:
+        return field.default
+    return dc.MISSING
+
+
+def format_opts(optional: bool, extra: list[str] | None = None) -> str:
+    """Format field options string for Django."""
+    parts = []
+    if optional:
+        parts.append("null=True, blank=True")
+    if extra:
+        parts.extend(extra)
+    return ", ".join(parts)
+
+
+def is_enum(type_hint: Any) -> bool:
+    """Check if type is an Enum."""
+    base, _ = unwrap_optional(type_hint)
+    return isinstance(base, type) and issubclass(base, Enum)
+
+
+def get_enum_values(enum_class: type) -> list[tuple[str, str]]:
+    """Get list of (name, value) pairs from an Enum."""
+    return [(m.name, m.value) for m in enum_class]