"""
Core package - 核心功能模块

Keep package imports lazy so lightweight runtime contexts can import
`core.script_system` without eagerly pulling in the editor stack.
"""

from importlib import import_module

__all__ = [
    "CoreWorld",
    "SelectionSystem",
    "EventHandler",
    "ToolManager",
    "ScriptManager",
    "ScriptBase",
    "ScriptComponent",
]

_LAZY_IMPORTS = {
    "CoreWorld": ("core.world", "CoreWorld"),
    "SelectionSystem": ("core.selection", "SelectionSystem"),
    "EventHandler": ("core.event_handler", "EventHandler"),
    "ToolManager": ("core.tool_manager", "ToolManager"),
    "ScriptManager": ("core.script_system", "ScriptManager"),
    "ScriptBase": ("core.script_system", "ScriptBase"),
    "ScriptComponent": ("core.script_system", "ScriptComponent"),
}


def __getattr__(name):
    if name not in _LAZY_IMPORTS:
        raise AttributeError(f"module 'core' has no attribute {name!r}")

    module_name, attr_name = _LAZY_IMPORTS[name]
    module = import_module(module_name)
    value = getattr(module, attr_name)
    globals()[name] = value
    return value