# =============================
# app/simulation/ui/__init__.py
# =============================

from __future__ import annotations
from typing import List, Optional, Type
import importlib, inspect, pkgutil, pathlib

class UITab:
    """
    Basis für alle Tabs. Erwarte:
      - class-attr: NAME, TITLE, PRIO
      - __init__(parent, sim) erzeugt self.frame (tk.Frame/ttk.Frame)
      - optionale Methoden: apply(), save_into_config(out), load_from_config(cfg)
    """
    NAME: str  = "tab"
    TITLE: str = "Tab"
    PRIO: int  = 100

    # No-ops für Save/Load
    def apply(self): pass
    def save_into_config(self, out): pass
    def load_from_config(self, cfg): pass

def discover_ui_tabs(parent, sim, pkg_name: str = "app.simulation.ui") -> List[UITab]:
    """Lädt alle Unter-Module von pkg_name, instanziiert Klassen, die UITab erben."""
    tabs: List[UITab] = []
    pkg = importlib.import_module(pkg_name)
    pkg_path = pathlib.Path(pkg.__file__).parent

    for _, modname, ispkg in pkgutil.iter_modules([str(pkg_path)]):
        if ispkg:  # (optional: Subpackages zulassen – hier überspringen)
            continue
        full = f"{pkg_name}.{modname}"
        try:
            m = importlib.import_module(full)
        except Exception as exc:
            print(f"[ui-loader] Importfehler {full}: {exc}")
            continue

        for _, obj in inspect.getmembers(m, inspect.isclass):
            if obj is UITab or not issubclass(obj, UITab):
                continue
            try:
                inst = obj(parent, sim)
            except Exception as exc:
                print(f"[ui-loader] Instanzierung fehlgeschlagen {obj.__name__}: {exc}")
                continue
            tabs.append(inst)

    tabs.sort(key=lambda t: (getattr(t, "PRIO", 100), getattr(t, "NAME", t.__class__.__name__)))
    return tabs