diskmanager/mainwindow.py

# mainwindow.py
import sys
import logging
import re
import os # 导入 os 模块

from PySide6.QtWidgets import (QApplication, QMainWindow, QTreeWidgetItem,
                               QMessageBox, QHeaderView, QMenu, QInputDialog, QDialog)
from PySide6.QtCore import Qt, QPoint

# 导入自动生成的 UI 文件
from ui_form import Ui_MainWindow
# 导入我们自己编写的系统信息管理模块
from system_info import SystemInfoManager
# 导入日志配置
from logger_config import setup_logging, logger
# 导入磁盘操作模块
from disk_operations import DiskOperations
# 导入 RAID 操作模块
from raid_operations import RaidOperations
# 导入 LVM 操作模块
from lvm_operations import LvmOperations
# 导入自定义对话框
from dialogs import (CreatePartitionDialog, MountDialog, CreateRaidDialog,
                     CreatePvDialog, CreateVgDialog, CreateLvDialog)


class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        setup_logging(self.ui.logOutputTextEdit)
        logger.info("应用程序启动。")

        # 初始化管理器和操作类
        self.system_manager = SystemInfoManager()
        self.disk_ops = DiskOperations()
        self.raid_ops = RaidOperations()
        self.lvm_ops = LvmOperations()

        # 连接刷新按钮的信号到槽函数
        if hasattr(self.ui, 'refreshButton'):
            self.ui.refreshButton.clicked.connect(self.refresh_all_info)
        else:
            logger.warning("Warning: refreshButton not found in UI. Please add it in form.ui and regenerate ui_form.py.")

        # 启用 treeWidget 的自定义上下文菜单
        self.ui.treeWidget_block_devices.setContextMenuPolicy(Qt.CustomContextMenu)
        self.ui.treeWidget_block_devices.customContextMenuRequested.connect(self.show_block_device_context_menu)

        self.ui.treeWidget_raid.setContextMenuPolicy(Qt.CustomContextMenu)
        self.ui.treeWidget_raid.customContextMenuRequested.connect(self.show_raid_context_menu)

        self.ui.treeWidget_lvm.setContextMenuPolicy(Qt.CustomContextMenu)
        self.ui.treeWidget_lvm.customContextMenuRequested.connect(self.show_lvm_context_menu)


        # 初始化时刷新所有数据
        self.refresh_all_info()
        logger.info("所有设备信息已初始化加载。")

    def refresh_all_info(self):
        """
        刷新所有设备信息：块设备、RAID和LVM。
        """
        logger.info("开始刷新所有设备信息...")
        self.refresh_block_devices_info()
        self.refresh_raid_info()
        self.refresh_lvm_info()
        logger.info("所有设备信息刷新完成。")

    # --- 块设备概览 Tab ---
    def refresh_block_devices_info(self):
        self.ui.treeWidget_block_devices.clear()

        columns = [
            ("设备名", 'name'), ("类型", 'type'), ("大小", 'size'), ("挂载点", 'mountpoint'),
            ("文件系统", 'fstype'), ("只读", 'ro'), ("UUID", 'uuid'), ("PARTUUID", 'partuuid'),
            ("厂商", 'vendor'), ("型号", 'model'), ("序列号", 'serial'),
            ("主次号", 'maj:min'), ("父设备名", 'pkname'),
        ]

        headers = [col[0] for col in columns]
        self.field_keys = [col[1] for col in columns]

        self.ui.treeWidget_block_devices.setColumnCount(len(headers))
        self.ui.treeWidget_block_devices.setHeaderLabels(headers)

        for i in range(len(headers)):
            self.ui.treeWidget_block_devices.header().setSectionResizeMode(i, QHeaderView.ResizeToContents)

        try:
            devices = self.system_manager.get_block_devices()
            for dev in devices:
                self._add_device_to_tree(self.ui.treeWidget_block_devices, dev)

            for i in range(len(headers)):
                self.ui.treeWidget_block_devices.resizeColumnToContents(i)
            logger.info("块设备信息刷新成功。")

        except Exception as e:
            QMessageBox.critical(self, "错误", f"刷新块设备信息失败: {e}")
            logger.error(f"刷新块设备信息失败: {e}")

    def _add_device_to_tree(self, parent_item, dev_data):
        item = QTreeWidgetItem(parent_item)
        for i, key in enumerate(self.field_keys):
            value = dev_data.get(key)
            if key == 'ro':
                item.setText(i, "是" if value else "否")
            elif value is None:
                item.setText(i, "")
            else:
                item.setText(i, str(value))

        item.setData(0, Qt.UserRole, dev_data)

        if 'children' in dev_data:
            for child in dev_data['children']:
                self._add_device_to_tree(item, child)
            item.setExpanded(True)

    def show_block_device_context_menu(self, pos: QPoint):
        item = self.ui.treeWidget_block_devices.itemAt(pos)
        menu = QMenu(self)

        # 菜单项：创建 RAID 阵列，创建 PV
        create_menu = QMenu("创建...", self)
        create_raid_action = create_menu.addAction("创建 RAID 阵列...")
        create_raid_action.triggered.connect(self._handle_create_raid_array)
        create_pv_action = create_menu.addAction("创建物理卷 (PV)...")
        create_pv_action.triggered.connect(self._handle_create_pv)
        menu.addMenu(create_menu)
        menu.addSeparator()


        if item:
            dev_data = item.data(0, Qt.UserRole)
            if not dev_data:
                logger.warning(f"无法获取设备 {item.text(0)} 的详细数据。")
                return

            device_name = dev_data.get('name')
            device_type = dev_data.get('type')
            mount_point = dev_data.get('mountpoint')
            device_path = dev_data.get('path') # 使用lsblk提供的完整路径

            if not device_path: # 如果path字段缺失，则尝试从name构造
                device_path = f"/dev/{device_name}"


            # 针对磁盘 (disk) 的操作
            if device_type == 'disk':
                create_partition_action = menu.addAction(f"创建分区 {device_path}...")
                create_partition_action.triggered.connect(lambda: self._handle_create_partition(device_path, dev_data.get('size'))) # 传递原始大小字符串
                menu.addSeparator()

            # 挂载/卸载操作 (针对分区 'part' 和 RAID/LVM 逻辑卷，但这里只处理 'part')
            if device_type == 'part':
                if not mount_point or mount_point == '' or mount_point == 'N/A':
                    mount_action = menu.addAction(f"挂载 {device_path}...")
                    mount_action.triggered.connect(lambda: self._handle_mount(device_path))
                elif mount_point != '[SWAP]':
                    unmount_action = menu.addAction(f"卸载 {device_path}")
                    # FIX: 更改 lambda 表达式，避免被 triggered 信号的参数覆盖
                    unmount_action.triggered.connect(lambda: self._unmount_and_refresh(device_path))
                menu.addSeparator()

                # 删除分区和格式化操作 (针对分区 'part')
                delete_action = menu.addAction(f"删除分区 {device_path}")
                delete_action.triggered.connect(lambda: self._handle_delete_partition(device_path))

                format_action = menu.addAction(f"格式化分区 {device_path}...")
                format_action.triggered.connect(lambda: self._handle_format_partition(device_path))

        if menu.actions():
            menu.exec(self.ui.treeWidget_block_devices.mapToGlobal(pos))
        else:
            logger.info("右键点击了空白区域或设备没有可用的操作。")

    def _handle_create_partition(self, disk_path, total_size_str): # 接收原始大小字符串
            # 1. 解析磁盘总大小 (MiB)
            total_disk_mib = 0.0
            logger.debug(f"尝试为磁盘 {disk_path} 创建分区。原始大小字符串: '{total_size_str}'")

            if total_size_str:
                match = re.match(r'(\d+(\.\d+)?)\s*([KMGT]?B?)', total_size_str, re.IGNORECASE)
                if match:
                    value = float(match.group(1))
                    unit = match.group(3).upper() if match.group(3) else ''

                    if unit == 'KB' or unit == 'K': total_disk_mib = value / 1024
                    elif unit == 'MB' or unit == 'M': total_disk_mib = value
                    elif unit == 'GB' or unit == 'G': total_disk_mib = value * 1024
                    elif unit == 'TB' or unit == 'T': total_disk_mib = value * 1024 * 1024
                    elif unit == 'B':
                         total_disk_mib = value / (1024 * 1024)
                    else:
                        logger.warning(f"无法识别磁盘 {disk_path} 的大小单位: '{unit}' (原始: '{total_size_str}')")
                        total_disk_mib = 0.0
                    logger.debug(f"解析后的磁盘总大小 (MiB): {total_disk_mib}")
                else:
                    logger.warning(f"无法解析磁盘 {disk_path} 的大小字符串 '{total_size_str}'。正则表达式不匹配。")
                    total_disk_mib = 0.0
            else:
                logger.warning(f"获取磁盘 {disk_path} 的大小字符串为空或None。")
                total_disk_mib = 0.0

            if total_disk_mib <= 0.0:
                QMessageBox.critical(self, "错误", f"无法获取磁盘 {disk_path} 的有效总大小。")
                return

            # 2. 获取下一个分区的起始位置 (MiB)
            start_position_mib = self.disk_ops.get_disk_next_partition_start_mib(disk_path)
            if start_position_mib is None: # 如果获取起始位置失败
                QMessageBox.critical(self, "错误", f"无法确定磁盘 {disk_path} 的分区起始位置。")
                return

            # 3. 计算最大可用空间 (MiB)
            max_available_mib = total_disk_mib - start_position_mib
            if max_available_mib < 0: # 安全检查，理论上不应该发生
                max_available_mib = 0.0

            # 确保 max_available_mib 至少为 1 MiB，以避免 spinbox 最小值大于最大值的问题
            # 0.1 GB = 102.4 MiB, so 1 MiB is a safe minimum for fdisk/parted
            if max_available_mib < 1.0:
                max_available_mib = 1.0 # 最小可分配空间 (1 MiB)

            dialog = CreatePartitionDialog(self, disk_path, total_disk_mib, max_available_mib) # 传递 total_disk_mib 和 max_available_mib
            if dialog.exec() == QDialog.Accepted:
                info = dialog.get_partition_info()
                if info: # Check if info is not None (dialog might have returned None on validation error)
                    # 调用 disk_ops.create_partition，传递 total_disk_mib 和 use_max_space 标志
                    new_partition_path = self.disk_ops.create_partition(
                        info['disk_path'],
                        info['partition_table_type'],
                        info['size_gb'],
                        info['total_disk_mib'], # 传递磁盘总大小 (MiB)
                        info['use_max_space'] # 传递是否使用最大空间的标志
                    )
                    if new_partition_path:
                        self.refresh_all_info() # 刷新以显示新创建的分区

                        # 询问用户是否要格式化新创建的分区
                        reply = QMessageBox.question(None, "格式化新分区",
                                                    f"分区 {new_partition_path} 已成功创建。\n"
                                                    "您现在想格式化这个分区吗？",
                                                    QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
                        if reply == QMessageBox.Yes:
                            # 调用格式化函数，fstype=None 会弹出选择框
                            if self.disk_ops.format_partition(new_partition_path, fstype=None):
                                self.refresh_all_info() # 格式化成功后再次刷新
                # else: create_partition already shows an error message
            # else: dialog was cancelled, no action needed

    def _handle_mount(self, device_path):
        dialog = MountDialog(self, device_path)
        if dialog.exec() == QDialog.Accepted:
            info = dialog.get_mount_info()
            if info: # 确保 info 不是 None (用户可能在 MountDialog 中取消了操作)
                if self.disk_ops.mount_partition(device_path, info['mount_point'], info['add_to_fstab']): # <--- 传递 add_to_fstab
                    self.refresh_all_info()

    # 新增辅助方法，用于卸载并刷新
    def _unmount_and_refresh(self, device_path):
        """Helper method to unmount a device and then refresh all info."""
        if self.disk_ops.unmount_partition(device_path, show_dialog_on_error=True):
            self.refresh_all_info()

    def _handle_delete_partition(self, device_path):
        # delete_partition 内部会调用 unmount_partition 和 _remove_fstab_entry
        if self.disk_ops.delete_partition(device_path):
            self.refresh_all_info()

    def _handle_format_partition(self, device_path):
        # format_partition 内部会调用 unmount_partition 和 _remove_fstab_entry
        if self.disk_ops.format_partition(device_path):
            self.refresh_all_info()

    # --- RAID 管理 Tab ---
    def refresh_raid_info(self):
        self.ui.treeWidget_raid.clear()

        raid_headers = [
            "阵列设备", "级别", "状态", "大小", "活动设备", "失败设备", "备用设备",
            "总设备数", "UUID", "名称", "Chunk Size", "挂载点" # 添加挂载点列
        ]
        self.ui.treeWidget_raid.setColumnCount(len(raid_headers))
        self.ui.treeWidget_raid.setHeaderLabels(raid_headers)

        for i in range(len(raid_headers)):
            self.ui.treeWidget_raid.header().setSectionResizeMode(i, QHeaderView.ResizeToContents)

        try:
            raid_arrays = self.system_manager.get_mdadm_arrays()
            if not raid_arrays:
                item = QTreeWidgetItem(self.ui.treeWidget_raid)
                item.setText(0, "未找到RAID阵列。")
                logger.info("未找到RAID阵列。")
                return

            for array in raid_arrays:
                array_item = QTreeWidgetItem(self.ui.treeWidget_raid)
                array_path = array.get('device', 'N/A')
                # 确保 array_path 是一个有效的路径，否则上下文菜单会失效
                if not array_path or array_path == 'N/A':
                    logger.warning(f"RAID阵列 '{array.get('name', '未知')}' 的设备路径无效，跳过。")
                    continue

                current_mount_point = self.system_manager.get_mountpoint_for_device(array_path)

                array_item.setText(0, array_path)
                array_item.setText(1, array.get('level', 'N/A'))
                array_item.setText(2, array.get('state', 'N/A'))
                array_item.setText(3, array.get('array_size', 'N/A'))
                array_item.setText(4, array.get('active_devices', 'N/A'))
                array_item.setText(5, array.get('failed_devices', 'N/A'))
                array_item.setText(6, array.get('spare_devices', 'N/A'))
                array_item.setText(7, array.get('total_devices', 'N/A'))
                array_item.setText(8, array.get('uuid', 'N/A'))
                array_item.setText(9, array.get('name', 'N/A'))
                array_item.setText(10, array.get('chunk_size', 'N/A'))
                array_item.setText(11, current_mount_point if current_mount_point else "") # 显示挂载点
                array_item.setExpanded(True)
                # 存储原始数据，用于上下文菜单
                # 确保 array_path 字段在存储的数据中是正确的
                array_data_for_context = array.copy()
                array_data_for_context['device'] = array_path
                array_item.setData(0, Qt.UserRole, array_data_for_context)

                # 添加成员设备作为子节点
                for member in array.get('member_devices', []):
                    member_item = QTreeWidgetItem(array_item)
                    member_item.setText(0, f"  {member.get('device_path', 'N/A')}")
                    member_item.setText(1, f"成员: {member.get('raid_device', 'N/A')}")
                    member_item.setText(2, member.get('state', 'N/A'))
                    member_item.setText(3, f"Major: {member.get('major', 'N/A')}, Minor: {member.get('minor', 'N/A')}")
                    # 成员设备不存储UserRole数据，因为操作通常针对整个阵列

            # 自动调整列宽
            for i in range(len(raid_headers)):
                self.ui.treeWidget_raid.resizeColumnToContents(i)
            logger.info("RAID阵列信息刷新成功。")

        except Exception as e:
            QMessageBox.critical(self, "错误", f"刷新RAID阵列信息失败: {e}")
            logger.error(f"刷新RAID阵列信息失败: {e}")

    def show_raid_context_menu(self, pos: QPoint):
        item = self.ui.treeWidget_raid.itemAt(pos)
        menu = QMenu(self)

        # 始终提供创建 RAID 阵列的选项
        create_raid_action = menu.addAction("创建 RAID 阵列...")
        create_raid_action.triggered.connect(self._handle_create_raid_array)
        menu.addSeparator()

        if item and item.parent() is None: # 只有点击的是顶层RAID阵列项
            array_data = item.data(0, Qt.UserRole)
            if not array_data:
                logger.warning(f"无法获取 RAID 阵列 {item.text(0)} 的详细数据。")
                return

            array_path = array_data.get('device') # e.g., /dev/md126
            member_devices = [m.get('device_path') for m in array_data.get('member_devices', [])]

            if not array_path or array_path == 'N/A':
                logger.warning(f"RAID阵列 '{array_data.get('name', '未知')}' 的设备路径无效，无法显示操作。")
                return # 如果路径无效，则不显示任何操作

            # Check if RAID array is mounted
            current_mount_point = self.system_manager.get_mountpoint_for_device(array_path)

            if current_mount_point and current_mount_point != '[SWAP]' and current_mount_point != '':
                unmount_action = menu.addAction(f"卸载 {array_path} ({current_mount_point})")
                # FIX: 更改 lambda 表达式，避免被 triggered 信号的参数覆盖
                unmount_action.triggered.connect(lambda: self._unmount_and_refresh(array_path))
            else:
                mount_action = menu.addAction(f"挂载 {array_path}...")
                mount_action.triggered.connect(lambda: self._handle_mount(array_path))
            menu.addSeparator()

            stop_action = menu.addAction(f"停止阵列 {array_path}")
            stop_action.triggered.connect(lambda: self._handle_stop_raid_array(array_path))

            delete_action = menu.addAction(f"删除阵列 {array_path}")
            delete_action.triggered.connect(lambda: self._handle_delete_raid_array(array_path, member_devices))

            format_action = menu.addAction(f"格式化阵列 {array_path}...")
            # RAID 阵列的格式化也直接调用 disk_ops.format_partition
            format_action.triggered.connect(lambda: self._handle_format_raid_array(array_path))

        if menu.actions():
            menu.exec(self.ui.treeWidget_raid.mapToGlobal(pos))
        else:
            logger.info("右键点击了空白区域或没有可用的RAID操作。")

    def _handle_create_raid_array(self):
        # 获取所有可用于创建RAID阵列的设备
        # get_unallocated_partitions 现在应该返回所有合适的磁盘和分区
        available_devices = self.system_manager.get_unallocated_partitions()

        if not available_devices:
            QMessageBox.warning(self, "警告", "没有可用于创建 RAID 阵列的设备。请确保有未挂载、未被LVM或RAID使用的磁盘或分区。")
            return

        dialog = CreateRaidDialog(self, available_devices)
        if dialog.exec() == QDialog.Accepted:
            info = dialog.get_raid_info()
            if info: # Check if info is not None
                if self.raid_ops.create_raid_array(info['devices'], info['level'], info['chunk_size']):
                    self.refresh_all_info()

    def _handle_stop_raid_array(self, array_path):
        if self.raid_ops.stop_raid_array(array_path):
            self.refresh_all_info()

    def _handle_delete_raid_array(self, array_path, member_devices):
        if self.raid_ops.delete_raid_array(array_path, member_devices):
            self.refresh_all_info()

    def _handle_format_raid_array(self, array_path):
        # 格式化RAID阵列与格式化分区类似，可以复用DiskOperations中的逻辑
        # 或者在RaidOperations中实现一个独立的format方法
        # 这里我们直接调用DiskOperations的format_partition方法
        # format_partition 内部会调用 unmount_partition(..., show_dialog_on_error=False) 和 _remove_fstab_entry
        if self.disk_ops.format_partition(array_path):
            self.refresh_all_info()

    # --- LVM 管理 Tab ---
    def refresh_lvm_info(self):
        self.ui.treeWidget_lvm.clear()

        lvm_headers = ["名称", "大小", "属性", "UUID", "关联", "空闲/已用", "路径/格式", "挂载点"] # 添加挂载点列
        self.ui.treeWidget_lvm.setColumnCount(len(lvm_headers))
        self.ui.treeWidget_lvm.setHeaderLabels(lvm_headers)

        for i in range(len(lvm_headers)):
            self.ui.treeWidget_lvm.header().setSectionResizeMode(i, QHeaderView.ResizeToContents)

        try:
            lvm_data = self.system_manager.get_lvm_info()

            if not lvm_data.get('pvs') and not lvm_data.get('vgs') and not lvm_data.get('lvs'):
                item = QTreeWidgetItem(self.ui.treeWidget_lvm)
                item.setText(0, "未找到LVM信息。")
                logger.info("未找到LVM信息。")
                return

            # 物理卷 (PVs)
            pv_root_item = QTreeWidgetItem(self.ui.treeWidget_lvm)
            pv_root_item.setText(0, "物理卷 (PVs)")
            pv_root_item.setExpanded(True)
            pv_root_item.setData(0, Qt.UserRole, {'type': 'pv_root'}) # 标识根节点
            if lvm_data.get('pvs'):
                for pv in lvm_data['pvs']:
                    pv_item = QTreeWidgetItem(pv_root_item)
                    pv_name = pv.get('pv_name', 'N/A')
                    if pv_name.startswith('/dev/'): # Ensure it's a full path
                        pv_path = pv_name
                    else:
                        # Attempt to construct if it's just a name, though pv_name from pvs usually is full path
                        # Fallback, may not be accurate if system_manager.get_lvm_info() isn't consistent
                        pv_path = f"/dev/{pv_name}" if pv_name != 'N/A' else 'N/A'

                    pv_item.setText(0, pv_name)
                    pv_item.setText(1, pv.get('pv_size', 'N/A'))
                    pv_item.setText(2, pv.get('pv_attr', 'N/A'))
                    pv_item.setText(3, pv.get('pv_uuid', 'N/A'))
                    pv_item.setText(4, f"VG: {pv.get('vg_name', 'N/A')}")
                    pv_item.setText(5, f"空闲: {pv.get('pv_free', 'N/A')}")
                    pv_item.setText(6, pv.get('pv_fmt', 'N/A'))
                    pv_item.setText(7, "") # PV没有直接挂载点
                    # 存储原始数据，确保pv_name是正确的设备路径
                    pv_data_for_context = pv.copy()
                    pv_data_for_context['pv_name'] = pv_path # Store the full path for context menu
                    pv_item.setData(0, Qt.UserRole, {'type': 'pv', 'data': pv_data_for_context}) # 存储原始数据
            else:
                item = QTreeWidgetItem(pv_root_item)
                item.setText(0, "未找到物理卷。")

            # 卷组 (VGs)
            vg_root_item = QTreeWidgetItem(self.ui.treeWidget_lvm)
            vg_root_item.setText(0, "卷组 (VGs)")
            vg_root_item.setExpanded(True)
            vg_root_item.setData(0, Qt.UserRole, {'type': 'vg_root'})
            if lvm_data.get('vgs'):
                for vg in lvm_data['vgs']:
                    vg_item = QTreeWidgetItem(vg_root_item)
                    vg_name = vg.get('vg_name', 'N/A')
                    vg_item.setText(0, vg_name)
                    vg_item.setText(1, vg.get('vg_size', 'N/A'))
                    vg_item.setText(2, vg.get('vg_attr', 'N/A'))
                    vg_item.setText(3, vg.get('vg_uuid', 'N/A'))
                    vg_item.setText(4, f"PVs: {vg.get('pv_count', 'N/A')}, LVs: {vg.get('lv_count', 'N/A')}")
                    vg_item.setText(5, f"空闲: {vg.get('vg_free', 'N/A')}, 已分配: {vg.get('vg_alloc_percent', 'N/A')}%")
                    vg_item.setText(6, vg.get('vg_fmt', 'N/A'))
                    vg_item.setText(7, "") # VG没有直接挂载点
                    # 存储原始数据，确保vg_name是正确的
                    vg_data_for_context = vg.copy()
                    vg_data_for_context['vg_name'] = vg_name
                    vg_item.setData(0, Qt.UserRole, {'type': 'vg', 'data': vg_data_for_context})
            else:
                item = QTreeWidgetItem(vg_root_item)
                item.setText(0, "未找到卷组。")

            # 逻辑卷 (LVs)
            lv_root_item = QTreeWidgetItem(self.ui.treeWidget_lvm)
            lv_root_item.setText(0, "逻辑卷 (LVs)")
            lv_root_item.setExpanded(True)
            lv_root_item.setData(0, Qt.UserRole, {'type': 'lv_root'})
            if lvm_data.get('lvs'):
                for lv in lvm_data['lvs']:
                    lv_item = QTreeWidgetItem(lv_root_item)
                    lv_name = lv.get('lv_name', 'N/A')
                    vg_name = lv.get('vg_name', 'N/A')
                    lv_attr = lv.get('lv_attr', '')

                    # 确保 lv_path 是一个有效的路径
                    lv_path = lv.get('lv_path')
                    if not lv_path or lv_path == 'N/A':
                        # 如果 lv_path 不存在或为 N/A，则尝试从 vg_name 和 lv_name 构造
                        if vg_name != 'N/A' and lv_name != 'N/A':
                            lv_path = f"/dev/{vg_name}/{lv_name}"
                        else:
                            lv_path = 'N/A' # 实在无法构造则标记为N/A

                    current_mount_point = self.system_manager.get_mountpoint_for_device(lv_path)

                    lv_item.setText(0, lv_name)
                    lv_item.setText(1, lv.get('lv_size', 'N/A'))
                    lv_item.setText(2, lv_attr)
                    lv_item.setText(3, lv.get('lv_uuid', 'N/A'))
                    lv_item.setText(4, f"VG: {vg_name}, Origin: {lv.get('origin', 'N/A')}")
                    lv_item.setText(5, f"快照: {lv.get('snap_percent', 'N/A')}%")
                    lv_item.setText(6, lv_path) # 显示构造或获取的路径
                    lv_item.setText(7, current_mount_point if current_mount_point else "") # 显示挂载点

                    # 存储原始数据，确保 lv_path, lv_name, vg_name, lv_attr 都是正确的
                    lv_data_for_context = lv.copy()
                    lv_data_for_context['lv_path'] = lv_path
                    lv_data_for_context['lv_name'] = lv_name
                    lv_data_for_context['vg_name'] = vg_name
                    lv_data_for_context['lv_attr'] = lv_attr
                    lv_item.setData(0, Qt.UserRole, {'type': 'lv', 'data': lv_data_for_context})
            else:
                item = QTreeWidgetItem(lv_root_item)
                item.setText(0, "未找到逻辑卷。")

            for i in range(len(lvm_headers)):
                self.ui.treeWidget_lvm.resizeColumnToContents(i)
            logger.info("LVM信息刷新成功。")

        except Exception as e:
            QMessageBox.critical(self, "错误", f"刷新LVM信息失败: {e}")
            logger.error(f"刷新LVM信息失败: {e}")

    def show_lvm_context_menu(self, pos: QPoint):
        item = self.ui.treeWidget_lvm.itemAt(pos)
        menu = QMenu(self)

        # 根节点或空白区域的创建菜单
        create_menu = QMenu("创建...", self)
        create_pv_action = create_menu.addAction("创建物理卷 (PV)...")
        create_pv_action.triggered.connect(self._handle_create_pv)
        create_vg_action = create_menu.addAction("创建卷组 (VG)...")
        create_vg_action.triggered.connect(self._handle_create_vg)
        create_lv_action = create_menu.addAction("创建逻辑卷 (LV)...")
        create_lv_action.triggered.connect(self._handle_create_lv)
        menu.addMenu(create_menu)
        menu.addSeparator()

        if item:
            item_data = item.data(0, Qt.UserRole)
            if not item_data:
                logger.warning(f"无法获取 LVM 项 {item.text(0)} 的详细数据。")
                return

            item_type = item_data.get('type')
            data = item_data.get('data', {})

            if item_type == 'pv':
                pv_name = data.get('pv_name')
                if pv_name and pv_name != 'N/A':
                    delete_pv_action = menu.addAction(f"删除物理卷 {pv_name}")
                    delete_pv_action.triggered.connect(lambda: self._handle_delete_pv(pv_name))
            elif item_type == 'vg':
                vg_name = data.get('vg_name')
                if vg_name and vg_name != 'N/A':
                    delete_vg_action = menu.addAction(f"删除卷组 {vg_name}")
                    delete_vg_action.triggered.connect(lambda: self._handle_delete_vg(vg_name))
            elif item_type == 'lv':
                lv_name = data.get('lv_name')
                vg_name = data.get('vg_name')
                lv_attr = data.get('lv_attr', '')
                lv_path = data.get('lv_path') # e.g., /dev/vgname/lvname

                # 确保所有关键信息都存在且有效
                if lv_name and vg_name and lv_path and lv_path != 'N/A':
                    # Activation/Deactivation
                    if 'a' in lv_attr: # 'a' 表示 active
                        deactivate_lv_action = menu.addAction(f"停用逻辑卷 {lv_name}")
                        deactivate_lv_action.triggered.connect(lambda: self._handle_deactivate_lv(lv_name, vg_name))
                    else:
                        activate_lv_action = menu.addAction(f"激活逻辑卷 {lv_name}")
                        activate_lv_action.triggered.connect(lambda: self._handle_activate_lv(lv_name, vg_name))

                    # Mount/Unmount
                    current_mount_point = self.system_manager.get_mountpoint_for_device(lv_path)
                    if current_mount_point and current_mount_point != '[SWAP]' and current_mount_point != '':
                        unmount_lv_action = menu.addAction(f"卸载 {lv_name} ({current_mount_point})")
                        # FIX: 更改 lambda 表达式，避免被 triggered 信号的参数覆盖
                        unmount_lv_action.triggered.connect(lambda: self._unmount_and_refresh(lv_path))
                    else:
                        mount_lv_action = menu.addAction(f"挂载 {lv_name}...")
                        mount_lv_action.triggered.connect(lambda: self._handle_mount(lv_path))
                    menu.addSeparator() # 在挂载/卸载后添加分隔符

                    # Delete and Format
                    delete_lv_action = menu.addAction(f"删除逻辑卷 {lv_name}")
                    delete_lv_action.triggered.connect(lambda: self._handle_delete_lv(lv_name, vg_name))

                    format_lv_action = menu.addAction(f"格式化逻辑卷 {lv_name}...")
                    format_lv_action.triggered.connect(lambda: self._handle_format_partition(lv_path))
                else:
                    logger.warning(f"逻辑卷 '{lv_name}' (VG: {vg_name}) 的路径无效，无法显示操作。Lv Path: {lv_path}")

        if menu.actions():
            menu.exec(self.ui.treeWidget_lvm.mapToGlobal(pos))
        else:
            logger.info("右键点击了空白区域或没有可用的LVM操作。")

    def _handle_create_pv(self):
        available_partitions = self.system_manager.get_unallocated_partitions()
        if not available_partitions:
            QMessageBox.warning(self, "警告", "没有可用于创建物理卷的未分配分区。")
            return

        dialog = CreatePvDialog(self, available_partitions)
        if dialog.exec() == QDialog.Accepted:
            info = dialog.get_pv_info()
            if info: # Check if info is not None
                if self.lvm_ops.create_pv(info['device_path']):
                    self.refresh_all_info()

    def _handle_delete_pv(self, device_path):
        if self.lvm_ops.delete_pv(device_path):
            self.refresh_all_info()

    def _handle_create_vg(self):
        lvm_info = self.system_manager.get_lvm_info()
        available_pvs = []
        # Filter PVs that are not part of any VG
        for pv in lvm_info.get('pvs', []):
            pv_name = pv.get('pv_name')
            if pv_name and pv_name != 'N/A' and not pv.get('vg_name'): # Check if pv_name is not associated with any VG
                if pv_name.startswith('/dev/'):
                    available_pvs.append(pv_name)
                else:
                    # Attempt to construct full path if only name is given
                    available_pvs.append(f"/dev/{pv_name}")


        if not available_pvs:
            QMessageBox.warning(self, "警告", "没有可用于创建卷组的物理卷。请确保有未分配给任何卷组的物理卷。")
            return

        dialog = CreateVgDialog(self, available_pvs)
        if dialog.exec() == QDialog.Accepted:
            info = dialog.get_vg_info()
            if info: # Check if info is not None
                if self.lvm_ops.create_vg(info['vg_name'], info['pvs']):
                    self.refresh_all_info()

    def _handle_delete_vg(self, vg_name):
        if self.lvm_ops.delete_vg(vg_name):
            self.refresh_all_info()

    def _handle_create_lv(self):
            lvm_info = self.system_manager.get_lvm_info()
            available_vgs = []
            vg_sizes = {} # 存储每个 VG 的可用大小 (GB)
            for vg in lvm_info.get('vgs', []):
                vg_name = vg.get('vg_name')
                if vg_name and vg_name != 'N/A':
                    available_vgs.append(vg_name)

                    free_size_str = vg.get('vg_free', '0B').strip() # 确保去除空白字符
                    current_vg_size_gb = 0.0 # 为当前VG初始化大小

                    # LVM输出通常使用 'g', 'm', 't', 'k' 作为单位，而不是 'GB', 'MB'
                    # 匹配数字部分和可选的单位
                    match = re.match(r'(\d+\.?\d*)\s*([gmkt])?', free_size_str, re.IGNORECASE)
                    if match:
                        value = float(match.group(1))
                        unit = match.group(2).lower() if match.group(2) else '' # 获取单位，转小写

                        if unit == 'k': # Kilobytes
                            current_vg_size_gb = value / (1024 * 1024)
                        elif unit == 'm': # Megabytes
                            current_vg_size_gb = value / 1024
                        elif unit == 'g': # Gigabytes
                            current_vg_size_gb = value
                        elif unit == 't': # Terabytes
                            current_vg_size_gb = value * 1024
                        elif unit == '': # If no unit, assume GB if it's a large number, or just the value
                            current_vg_size_gb = value # This might be less accurate, but matches common LVM output
                        else:
                            logger.warning(f"未知LVM单位: '{unit}' for '{free_size_str}'")
                    else:
                        logger.warning(f"无法解析LVM空闲大小字符串: '{free_size_str}'")

                    vg_sizes[vg_name] = current_vg_size_gb


            if not available_vgs:
                QMessageBox.warning(self, "警告", "没有可用于创建逻辑卷的卷组。")
                return

            dialog = CreateLvDialog(self, available_vgs, vg_sizes) # 传递 vg_sizes
            if dialog.exec() == QDialog.Accepted:
                info = dialog.get_lv_info()
                if info: # 确保 info 不是 None (用户可能在 CreateLvDialog 中取消了操作)
                    # 传递 use_max_space 标志给 lvm_ops.create_lv
                    if self.lvm_ops.create_lv(info['lv_name'], info['vg_name'], info['size_gb'], info['use_max_space']):
                        self.refresh_all_info()

    def _handle_delete_lv(self, lv_name, vg_name):
        # 删除 LV 前，也需要确保卸载并从 fstab 移除
        # 获取 LV 的完整路径
        lv_path = f"/dev/{vg_name}/{lv_name}"
        # 尝试卸载并从 fstab 移除 (静默，因为删除操作是主要目的)
        self.disk_ops.unmount_partition(lv_path, show_dialog_on_error=False)
        self.disk_ops._remove_fstab_entry(lv_path) # 直接调用内部方法，不弹出对话框

        if self.lvm_ops.delete_lv(lv_name, vg_name):
            self.refresh_all_info()

    def _handle_activate_lv(self, lv_name, vg_name):
        if self.lvm_ops.activate_lv(lv_name, vg_name):
            self.refresh_all_info()

    def _handle_deactivate_lv(self, lv_name, vg_name):
        if self.lvm_ops.deactivate_lv(lv_name, vg_name):
            self.refresh_all_info()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    widget = MainWindow()
    widget.show()
    sys.exit(app.exec())