from pathlib import Path
import importlib.util

from PySide6.QtWidgets import QStackedWidget, QWidget, QLabel
from PySide6.QtCore import Qt

from codes.common import clibs
from codes.common.signal_bus import signal_bus


class SStackedWidget(QStackedWidget):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.predos()
        self.init_ui()
        self.setup_slot()

    def predos(self):
        self.page_list = {}

    def init_ui(self):
        # stacked widget  1x: 10为一级按钮页，其余为二级按钮页，2-9同理 | 0x. 日志/设置/关于等页面
        self.load_pages()
        w = self.page_list.get("w01_setting")
        self.setCurrentWidget(w)

    def setup_slot(self):
        signal_bus.init_stacked_page.connect(self.set_current_page)
        signal_bus.qa_stacked_page_switch.connect(self.set_current_page)
        signal_bus.list_widget_click.connect(self.set_current_page)

    def set_current_page(self, page_id: str):
        w = self.page_list.get(page_id)
        self.setCurrentWidget(w)
        signal_bus.current_stacked_page.emit(page_id)

    def load_pages(self):
        def to_camel(snake: str) -> str:
            # w01_setting -> W01Setting
            return "".join(word.capitalize() for word in snake.split('_'))

        def instantiate(pyFile: Path, className: str) -> QWidget | None:
            try:
                spec = importlib.util.spec_from_file_location(pyFile.stem, pyFile)
                module = importlib.util.module_from_spec(spec)
                spec.loader.exec_module(module)
                cls = getattr(module, className)
                if issubclass(cls, QWidget):
                    return cls()
            except Exception as e:
                print(f"加载 {pyFile} 失败: {e}")

        pages_dir = clibs.base_path / "codes/ui/stacked_pages/"
        for py_file in pages_dir.glob("w*.py"):
            page_id = py_file.stem          # w01_setting
            class_name = to_camel(page_id)  # W01Setting
            widget = instantiate(py_file, class_name)
            if widget:
                widget.setObjectName(page_id)    # 用于 findChild / 切换
                self.addWidget(widget)
                self.page_list[page_id] = widget