"""PySide6 GUI entry point."""

from __future__ import annotations

import os
import sys

try:
    from PySide6.QtWidgets import (
        QApplication,
        QMainWindow,
        QTabWidget,
        QVBoxLayout,
        QWidget,
    )
    QT_IMPORT_ERROR = None
except ModuleNotFoundError as exc:
    QApplication = None
    QMainWindow = object
    QTabWidget = None
    QVBoxLayout = None
    QWidget = object
    QT_IMPORT_ERROR = exc


TAB_TITLES = [
    "① 导入采集",
    "② AI生成",
    "③ 更新shopee",
    "④ 账号管理",
    "⑤ 设置",
]


if QT_IMPORT_ERROR is None:
    class MainWindow(QMainWindow):
        """Main application window with the fixed five-tab workflow."""

        def __init__(self):
            super().__init__()
            self.setWindowTitle("cmshopee")
            self.resize(1180, 760)
            self.tabs = QTabWidget()
            self.tabs.setObjectName("mainTabs")
            self.tabs.currentChanged.connect(self._on_tab_changed)
            for title in TAB_TITLES:
                self.tabs.addTab(self._build_placeholder_tab(title), title)
            self.setCentralWidget(self.tabs)
            self.statusBar().showMessage("就绪")

        def _build_placeholder_tab(self, title):
            widget = QWidget()
            widget.setObjectName(title)
            layout = QVBoxLayout(widget)
            layout.setContentsMargins(18, 18, 18, 18)
            layout.addStretch(1)
            return widget

        def _on_tab_changed(self, index):
            self.statusBar().showMessage(f"当前：{self.tabs.tabText(index)}")
else:
    class MainWindow(QMainWindow):
        def __init__(self):
            raise RuntimeError("PySide6 未安装，无法启动 GUI")


def _ensure_offscreen_for_headless_tests():
    if "PYTEST_CURRENT_TEST" in os.environ and "QT_QPA_PLATFORM" not in os.environ:
        os.environ["QT_QPA_PLATFORM"] = "offscreen"


def main() -> int:
    if QT_IMPORT_ERROR is not None:
        print("cmshopee GUI 无法启动：当前 Python 环境未安装 PySide6。")
        return 1
    _ensure_offscreen_for_headless_tests()
    app = QApplication.instance() or QApplication(sys.argv)
    window = MainWindow()
    window.show()
    return app.exec()