"""PySide6 GUI package entry point."""

from __future__ import annotations

import os
import sys
import webbrowser

from .. import appconfig, chrome, diagnostics, update_check
from ..version import APP_NAME, display_name
from . import widgets as _widgets
from .widgets import *

QT_IMPORT_ERROR = _widgets.QT_IMPORT_ERROR
QMessageBox = _widgets._RawQMessageBox
run_worker = _widgets._raw_run_worker if QT_IMPORT_ERROR is None else _widgets.run_worker

if QT_IMPORT_ERROR is None:
    from .models import ApplyTaskTableModel, GenerateTaskTableModel, TaskTableModel
    from .workers import (
        AccountLoginCheckWorker,
        AIModelTestWorker,
        CMHubSettingsWorker,
        ApplyWorker,
        CollectWorker,
        GenerateWorker,
        ImageStudioDownloadOriginalWorker,
        ImageStudioExportWorker,
        ImageStudioGenerateJobsWorker,
        ImageStudioPullImagesWorker,
        WriteBackWorker,
    )
    from .tabs.accounts import AccountDialog, AccountsTab
    from .tabs.apply import ApplyTab
    from .tabs.collect import CollectTab
    from .tabs.generate import GenerateTab
    from .tabs.image_studio import ImageStudioPreviewDialog, ImageStudioTab
    from .tabs.settings import SettingsTab
    from .main_window import MainWindow
else:
    class MainWindow(QMainWindow):
        def __init__(self):
            raise RuntimeError(f"{APP_NAME} GUI 无法启动：当前 Python 环境未安装 PySide6。")


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 _write_update_check_diagnostic(message, *, result=None, exc=None):
    payload = None
    if result is not None:
        payload = {
            "checked": result.checked,
            "forced": result.forced,
            "current_version": result.current_version,
            "latest_version": result.latest_version,
            "min_supported_version": result.min_supported_version,
            "download_url": result.download_url,
            "error": result.error,
        }
    try:
        diagnostics.write_diagnostic_log(
            message,
            level="WARNING",
            step="startup_update_check",
            payload=payload,
            exc=exc,
        )
    except Exception:
        # 版本检查第一版必须失败放行，诊断日志不可写也不能阻断启动。
        pass


def _forced_update_details(result):
    online_version = result.latest_version or result.min_supported_version or "未知"
    lines = [
        f"当前版本：{result.current_version}",
        f"线上版本：{online_version}",
    ]
    if result.min_supported_version:
        lines.append(f"最低支持版本：{result.min_supported_version}")
    if result.message:
        lines.append(f"升级说明：{result.message}")
    if result.download_url:
        lines.append("请下载新版，关闭程序后覆盖程序文件和 _internal/，保留 data/ 目录。")
    else:
        lines.append("版本接口未提供下载地址，请联系管理员获取新版后再使用。")
    return "\n".join(lines)


def _show_forced_update_dialog(result, *, parent=None, opener=None) -> bool:
    opener = opener or webbrowser.open
    box = QMessageBox(parent)
    box.setIcon(QMessageBox.Warning)
    box.setWindowTitle("必须升级")
    box.setText("当前版本已不能继续使用，请先升级到新版。")
    box.setInformativeText(_forced_update_details(result))
    download_button = box.addButton("下载新版", QMessageBox.AcceptRole)
    exit_button = box.addButton("退出程序", QMessageBox.RejectRole)
    if not result.download_url and hasattr(download_button, "setEnabled"):
        download_button.setEnabled(False)
    box.setDefaultButton(download_button if result.download_url else exit_button)
    box.exec()
    if box.clickedButton() is download_button and result.download_url:
        opener(result.download_url)
    return False


def _run_startup_update_gate(*, checker=None, opener=None) -> bool:
    try:
        result = (checker or update_check.check_for_update)()
    except Exception as exc:
        _write_update_check_diagnostic("启动版本检查异常，已允许继续使用", exc=exc)
        return True

    if result.error:
        _write_update_check_diagnostic("启动版本检查失败，已允许继续使用", result=result)
    if result.forced:
        return _show_forced_update_dialog(result, opener=opener)
    return True


def main() -> int:
    if QT_IMPORT_ERROR is not None:
        print(f"{APP_NAME} 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)
    try:
        appconfig.prepare_data_dir()
    except appconfig.DataMigrationConflictError as exc:
        QMessageBox.critical(None, "数据迁移冲突", str(exc))
        return 1
    except appconfig.DataDirectoryWriteError as exc:
        QMessageBox.critical(None, "数据目录不可写", str(exc))
        return 1
    except appconfig.ConfigError as exc:
        QMessageBox.critical(None, "启动配置错误", str(exc))
        return 1
    if not _run_startup_update_gate():
        return 1
    try:
        startup = chrome.ensure_configured_chrome_path()
    except (OSError, appconfig.ConfigError) as exc:
        QMessageBox.critical(None, "启动配置错误", str(exc))
        return 1
    window = MainWindow(
        config=startup["config"],
        startup_status=startup["message"],
    )
    window.show()
    return app.exec()