using System.Globalization;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using NetworkTool.Client.Models;
using NetworkTool.Client.Services;

namespace NetworkTool.Client;

public partial class DeviceDetailsWindow : Window
{
    private const int ApplyConfirmationTimeoutSeconds = 20;
    private readonly ServerApiService _serverApiService = new();
    private readonly ObservableCollection<InterfaceEditor> _interfaces = [];
    private readonly string _baseAddress;
    private readonly string _remoteHost;
    private readonly string _localIPv4;
    private readonly string _password;
    private bool _configValidated;
    private bool _configDirty;
    private bool _isBusy;
    private bool _suppressConfigChangeHandling;
    private CancellationTokenSource? _statusMessageCts;

    public DeviceDetailsWindow(string baseAddress, string localIPv4, string password)
    {
        InitializeComponent();
        InterfacesItemsControl.ItemsSource = _interfaces;
        _baseAddress = baseAddress;
        _remoteHost = GetRemoteHost(baseAddress);
        _localIPv4 = localIPv4;
        _password = password;
        UpdateWindowTitle();
        Loaded += DeviceDetailsWindow_OnLoaded;
        Closing += DeviceDetailsWindow_OnClosing;
    }

    private async void DeviceDetailsWindow_OnLoaded(object sender, RoutedEventArgs e)
    {
        try
        {
            await LoadRemoteDetailsAsync();
            UpdateButtonStates();
        }
        catch (Exception ex)
        {
            ShowStatusMessage($"读取设备信息失败：{ex.Message}");
            SetBusyState(false);
        }
    }

    private async Task LoadRemoteDetailsAsync()
    {
        ClearDetails();
        var device = await _serverApiService.GetDeviceInfoAsync(_baseAddress, _password, _localIPv4);
        if (device is not null)
        {
            UpdateWindowTitle(device.Hostname, device.ServerVersion);
        }

        var interfaces = await _serverApiService.GetInterfacesAsync(_baseAddress, _password, _localIPv4);
        if (interfaces is null)
        {
            ShowStatusMessage("设备已连接，但暂时无法读取 Linux 接口列表。");
            return;
        }

        ShowStatusMessage($"当前管理接口：{interfaces.ManagementInterface}。正在读取全部接口配置。");
        foreach (var info in interfaces.Interfaces)
        {
            var editor = new InterfaceEditor(info);
            _interfaces.Add(editor);
            await LoadRemoteInterfaceConfigAsync(editor);
        }

        _configValidated = false;
        _configDirty = false;
        ShowStatusMessage("已读取全部接口配置。");
    }

    private void ClearDetails()
    {
        UpdateWindowTitle();
        _interfaces.Clear();
        _configValidated = false;
        _configDirty = false;
    }

    private void UpdateWindowTitle(string? hostname = null, string? serverVersion = null)
    {
        var hostPart = string.IsNullOrWhiteSpace(hostname) ? _remoteHost : $"{hostname} ({_remoteHost})";
        var versionPart = string.IsNullOrWhiteSpace(serverVersion) ? string.Empty : $" - Server {serverVersion}";
        Title = string.IsNullOrWhiteSpace(hostPart) ? $"设备信息与接口配置{versionPart}" : $"设备信息与接口配置 - {hostPart}{versionPart}";
    }

    private static string GetRemoteHost(string baseAddress)
    {
        return Uri.TryCreate(baseAddress, UriKind.Absolute, out var uri) ? uri.Host : baseAddress;
    }

    private async Task LoadRemoteInterfaceConfigAsync(InterfaceEditor editor, bool useBusyState = false)
    {
        if (useBusyState)
        {
            SetBusyState(true, "正在读取 Linux 端 IP 配置...");
        }

        try
        {
            var result = await _serverApiService.GetInterfaceConfigAsync(_baseAddress, _password, _localIPv4, editor.SystemName);
            if (!result.Success || result.Data is null)
            {
                ShowStatusMessage($"读取目标接口 {editor.SystemName} 配置失败：{result.Message}");
                return;
            }

            var config = result.Data;
            _suppressConfigChangeHandling = true;
            editor.Dhcp4 = config.Dhcp4;
            editor.Addresses.Clear();
            foreach (var address in config.EffectiveAddresses)
            {
                editor.Addresses.Add(new EditableAddress(editor) { IP = address.IP, Mask = PrefixToMask(address.Prefix) });
            }
            editor.Routes.Clear();
            editor.DefaultGatewayEnabled = false;
            editor.DefaultGateway = string.Empty;
            foreach (var route in config.EffectiveRoutes)
            {
                if (route.To.Equals("default", StringComparison.OrdinalIgnoreCase))
                {
                    editor.DefaultGatewayEnabled = true;
                    editor.DefaultGateway = route.Via;
                }
                else
                {
                    editor.Routes.Add(CreateEditableRoute(editor, route));
                }
            }
            editor.CustomRoutesEnabled = editor.Routes.Count > 0;
            editor.Dns.Clear();
            if (config.Dns is not null)
            {
                foreach (var dns in config.Dns)
                {
                    editor.Dns.Add(new EditableDns(editor) { Address = dns });
                }
            }
            _suppressConfigChangeHandling = false;
            UpdateButtonStates();
        }
        finally
        {
            _suppressConfigChangeHandling = false;
            if (useBusyState)
            {
                SetBusyState(false);
            }
        }
    }

    private async void ReloadInterfaceConfigButton_OnClick(object sender, RoutedEventArgs e)
    {
        if (!ConfirmDiscardPendingChanges("当前配置已修改但尚未应用，刷新会丢失未应用内容。是否继续刷新？", "确认刷新配置"))
        {
            return;
        }

        SetBusyState(true, "正在刷新全部接口配置...");
        try
        {
            foreach (var editor in _interfaces)
            {
                await LoadRemoteInterfaceConfigAsync(editor);
            }

            _configValidated = false;
            _configDirty = false;
            ShowStatusMessage("已刷新全部接口配置。");
        }
        finally
        {
            SetBusyState(false);
        }
    }

    private void DeviceDetailsWindow_OnClosing(object? sender, CancelEventArgs e)
    {
        if (!ConfirmDiscardPendingChanges("当前配置已修改但尚未应用。是否关闭窗口？", "确认关闭窗口"))
        {
            e.Cancel = true;
        }
    }

    private bool ConfirmDiscardPendingChanges(string message, string title)
    {
        if (!_configDirty)
        {
            return true;
        }

        return MessageBox.Show(this, message, title, MessageBoxButton.OKCancel, MessageBoxImage.Warning) == MessageBoxResult.OK;
    }

    private async void ValidateConfigButton_OnClick(object sender, RoutedEventArgs e)
    {
        var request = BuildConfigRequests();
        if (request is null)
        {
            return;
        }

        SetBusyState(true, "正在校验配置，请稍候...");
        try
        {
            var result = await _serverApiService.ValidateInterfaceConfigsAsync(_baseAddress, _password, _localIPv4, request);
            _configValidated = result.Success && result.Data?.Valid == true;
            if (result.Data is not null)
            {
                var warnings = result.Data.Warnings.Count > 0 ? $" 警告：{string.Join("；", result.Data.Warnings)}" : string.Empty;
                var errors = result.Data.Errors.Count > 0 ? $" 错误：{string.Join("；", result.Data.Errors)}" : string.Empty;
                ShowStatusMessage(_configValidated ? $"全部接口校验通过，可应用配置。{warnings}" : $"校验失败。{errors}{warnings}");
            }
            else
            {
                ShowStatusMessage($"校验失败：{result.Message}");
            }

            UpdateButtonStates();
        }
        finally
        {
            SetBusyState(false);
        }
    }

    private async void ApplyConfigButton_OnClick(object sender, RoutedEventArgs e)
    {
        var request = BuildConfigRequests();
        if (request is null)
        {
            return;
        }

        var confirmMessage = "将要一次性应用以下接口配置：\n\n" + FormatConfigSummary(request) + "\n\n请确认是否继续。";
        if (MessageBox.Show(this, confirmMessage, "确认应用配置", MessageBoxButton.OKCancel, MessageBoxImage.Question) != MessageBoxResult.OK)
        {
            return;
        }

        SetBusyState(true, "正在提交并应用配置，请稍候...");
        try
        {
            var applyResult = await _serverApiService.ApplyInterfaceConfigsAsync(_baseAddress, _password, _localIPv4, request);
            if (!applyResult.Success || applyResult.Data is null)
            {
                ShowStatusMessage($"提交配置任务失败：{applyResult.Message}");
                return;
            }

            ShowStatusMessage("配置任务已提交，正在应用并等待连通确认...");
            await PollTaskAsync(applyResult.Data.TaskId);
        }
        finally
        {
            SetBusyState(false);
        }
    }

    private async Task PollTaskAsync(string taskId)
    {
        var transientFailureCount = 0;
        var confirmationRequested = false;
        for (var i = 0; i < 20; i++)
        {
            await Task.Delay(1000);
            var result = await _serverApiService.GetTaskAsync(_baseAddress, _password, _localIPv4, taskId);
            if (!result.Success || result.Data is null)
            {
                if (result.StatusCode is null)
                {
                    transientFailureCount++;
                    ShowStatusMessage($"设备连接短暂中断，正在重试（{transientFailureCount}）。");
                    continue;
                }

                ShowStatusMessage($"读取任务状态失败：{result.Message}");
                return;
            }

            transientFailureCount = 0;
            var task = result.Data;
            ShowStatusMessage(FormatTaskStatusMessage(task));
            if (task.Status == "running" && task.Step == "confirming" && !confirmationRequested)
            {
                confirmationRequested = true;
                var confirm = ShowApplyConfirmationDialog(ApplyConfirmationTimeoutSeconds);
                if (confirm)
                {
                    var confirmResult = await _serverApiService.ConfirmApplyTaskAsync(_baseAddress, _password, _localIPv4, taskId);
                    ShowStatusMessage(confirmResult.Success ? "已发送保留配置确认。" : $"发送确认失败：{confirmResult.Message}");
                }
                else
                {
                    var cancelResult = await _serverApiService.CancelApplyTaskAsync(_baseAddress, _password, _localIPv4, taskId);
                    ShowStatusMessage(cancelResult.Success ? "已取消保留配置，正在回滚。" : $"发送取消失败：{cancelResult.Message}");
                }
            }

            if (task.Status is "success" or "failed" or "rolled_back")
            {
                ShowTaskCompletionDialog(task);
                foreach (var editor in _interfaces)
                {
                    await LoadRemoteInterfaceConfigAsync(editor);
                }

                return;
            }
        }

        ShowStatusMessage($"任务 {taskId} 轮询超时，请稍后手动刷新。");
    }

    private bool ShowApplyConfirmationDialog(int timeoutSeconds)
    {
        var remaining = timeoutSeconds;
        var result = false;
        var messageTextBlock = new TextBlock
        {
            Width = 420,
            TextWrapping = TextWrapping.Wrap,
            FontSize = 13,
            Foreground = Brushes.Black,
        };
        var confirmButton = new Button
        {
            MinWidth = 88,
            MinHeight = 32,
            Margin = new Thickness(0, 0, 10, 0),
            Content = "保留",
            IsDefault = true,
        };
        confirmButton.Style = (Style)FindResource("PrimaryButtonStyle");
        var cancelButton = new Button
        {
            MinWidth = 88,
            MinHeight = 32,
            Content = "回滚",
            IsCancel = true,
        };
        var dialog = new Window
        {
            Title = "确认保留网络配置",
            Owner = this,
            WindowStartupLocation = WindowStartupLocation.CenterOwner,
            ResizeMode = ResizeMode.NoResize,
            SizeToContent = SizeToContent.WidthAndHeight,
            Content = new StackPanel
            {
                Margin = new Thickness(18),
                Children =
                {
                    messageTextBlock,
                    new StackPanel
                    {
                        Margin = new Thickness(0, 18, 0, 0),
                        HorizontalAlignment = HorizontalAlignment.Right,
                        Orientation = Orientation.Horizontal,
                        Children = { confirmButton, cancelButton },
                    },
                },
            },
        };

        void UpdateMessage()
        {
            messageTextBlock.Text = $"当前客户端仍可连接到设备。是否确认保留这次网络配置？\n\n剩余 {remaining} 秒；超时或取消时，Linux 端会自动回滚。";
        }

        var timer = new System.Windows.Threading.DispatcherTimer { Interval = TimeSpan.FromSeconds(1) };
        timer.Tick += (_, _) =>
        {
            remaining--;
            if (remaining <= 0)
            {
                timer.Stop();
                dialog.DialogResult = false;
                dialog.Close();
                return;
            }
            UpdateMessage();
        };
        confirmButton.Click += (_, _) =>
        {
            result = true;
            dialog.DialogResult = true;
            dialog.Close();
        };
        cancelButton.Click += (_, _) =>
        {
            dialog.DialogResult = false;
            dialog.Close();
        };
        dialog.Closed += (_, _) => timer.Stop();

        UpdateMessage();
        timer.Start();
        dialog.ShowDialog();
        return result;
    }

    private async void RebootButton_OnClick(object sender, RoutedEventArgs e)
    {
        await ExecuteSystemActionAsync(
            "重启设备",
            "设备将立即重启，当前窗口和连接可能马上中断。是否继续？",
            () => _serverApiService.RebootAsync(_baseAddress, _password, _localIPv4));
    }

    private async void ShutdownButton_OnClick(object sender, RoutedEventArgs e)
    {
        await ExecuteSystemActionAsync(
            "关闭设备",
            "设备将立即关机，当前窗口和连接可能马上中断。是否继续？",
            () => _serverApiService.ShutdownAsync(_baseAddress, _password, _localIPv4));
    }

    private async Task ExecuteSystemActionAsync(string title, string confirmMessage, Func<Task<ApiCallResult<RemoteSystemActionResponse>>> action)
    {
        if (MessageBox.Show(this, confirmMessage, title, MessageBoxButton.OKCancel, MessageBoxImage.Warning) != MessageBoxResult.OK)
        {
            return;
        }

        var result = await action();
        if (!result.Success || result.Data is null)
        {
            ShowStatusMessage($"{title}失败：{result.Message}");
            return;
        }

        ShowStatusMessage($"{title}任务已提交：{result.Data.TaskId}。命令已发出，设备可能立即断开。");
    }

    private RemoteInterfaceConfig[]? BuildConfigRequests()
    {
        CommitConfigEdits();
        var result = new List<RemoteInterfaceConfig>();
        foreach (var editor in _interfaces)
        {
            var request = BuildConfigRequest(editor);
            if (request is null)
            {
                return null;
            }

            result.Add(request);
        }

        if (result.Count == 0)
        {
            ShowStatusMessage("接口配置不能为空。");
            return null;
        }

        return result.ToArray();
    }

    private RemoteInterfaceConfig? BuildConfigRequest(InterfaceEditor editor)
    {
        var dhcp4 = editor.Dhcp4;
        var addresses = Array.Empty<RemoteInterfaceAddressConfig>();
        var routes = Array.Empty<RemoteInterfaceRouteConfig>();
        if (!dhcp4)
        {
            if (editor.Addresses.All(item => string.IsNullOrWhiteSpace(item.IP) && string.IsNullOrWhiteSpace(item.Mask)))
            {
                ShowStatusMessage($"{editor.SystemName}：IP 地址不能为空，至少需要填写一行地址。");
                return null;
            }

            if (!TryBuildAddresses(editor, out addresses, out var addressError))
            {
                ShowStatusMessage($"{editor.SystemName}：{addressError}");
                return null;
            }

            if (!TryBuildRoutes(editor, out routes, out var routeError))
            {
                ShowStatusMessage($"{editor.SystemName}：{routeError}");
                return null;
            }
        }

        var dns = editor.Dns.Select(item => item.Address.Trim()).Where(item => item != string.Empty).ToArray();
        return new RemoteInterfaceConfig
        {
            Interface = editor.SystemName,
            Dhcp4 = dhcp4,
            Addresses = dhcp4 ? Array.Empty<RemoteInterfaceAddressConfig>() : addresses,
            Routes = dhcp4 ? Array.Empty<RemoteInterfaceRouteConfig>() : routes,
            Dns = dns,
        };
    }

    private void CommitConfigEdits()
    {
        CommitDataGridEdits(InterfacesItemsControl);
    }

    private static void CommitDataGridEdits(DependencyObject root)
    {
        for (var i = 0; i < VisualTreeHelper.GetChildrenCount(root); i++)
        {
            var child = VisualTreeHelper.GetChild(root, i);
            if (child is DataGrid dataGrid)
            {
                dataGrid.CommitEdit(DataGridEditingUnit.Cell, true);
                dataGrid.CommitEdit(DataGridEditingUnit.Row, true);
            }
            CommitDataGridEdits(child);
        }
    }

    private static string FormatCurrentIp(RemoteInterfaceConfig config)
    {
        if (config.EffectiveAddresses.Count == 0)
        {
            return config.Dhcp4 ? "DHCP 自动获取，暂无 IPv4" : "无";
        }

        var text = FormatAddresses(config.EffectiveAddresses);
        return config.Dhcp4 ? $"{text} (DHCP)" : text;
    }

    private static string FormatAddresses(IReadOnlyList<RemoteInterfaceAddressConfig> addresses)
    {
        return addresses.Count == 0 ? "无" : string.Join(Environment.NewLine, addresses.Select(item => $"{item.IP}/{item.Prefix}"));
    }

    private static string FormatRoutes(IReadOnlyList<RemoteInterfaceRouteConfig> routes)
    {
        return routes.Count == 0 ? "无" : string.Join(Environment.NewLine, routes.Select(item => $"{item.To} via {item.Via}"));
    }

    private static string FormatConfigSummary(IReadOnlyList<RemoteInterfaceConfig> configs)
    {
        return string.Join(Environment.NewLine + Environment.NewLine, configs.Select(item =>
            $"接口：{item.Interface}\n" +
            $"模式：{(item.Dhcp4 ? "DHCP 自动获取" : "静态 IPv4")}\n" +
            $"IP：{(item.Dhcp4 ? "自动获取" : FormatAddresses(item.Addresses))}\n" +
            $"路由：{(item.Dhcp4 ? "自动获取" : FormatRoutes(item.Routes))}\n" +
            $"DNS：{(item.Dns.Count == 0 ? "无" : string.Join(", ", item.Dns))}"));
    }

    private static EditableRoute CreateEditableRoute(InterfaceEditor owner, RemoteInterfaceRouteConfig route)
    {
        var to = route.To.Trim();
        var mask = string.Empty;
        if (to.Contains('/'))
        {
            var parts = to.Split('/', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
            if (parts.Length == 2 && int.TryParse(parts[1], out var prefix) && prefix >= 0 && prefix <= 32)
            {
                to = parts[0];
                mask = PrefixToMask(prefix);
            }
        }

        return new EditableRoute(owner) { To = to, Mask = mask, Via = route.Via };
    }

    private bool TryBuildAddresses(InterfaceEditor editor, out RemoteInterfaceAddressConfig[] addresses, out string error)
    {
        var result = new List<RemoteInterfaceAddressConfig>();
        foreach (var row in editor.Addresses)
        {
            var ip = row.IP.Trim();
            var maskText = row.Mask.Trim();
            if (ip == string.Empty && maskText == string.Empty)
            {
                continue;
            }
            if (ip.Contains('/'))
            {
                var parts = ip.Split('/', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
                if (parts.Length != 2 || !int.TryParse(parts[1], out var cidrPrefix) || cidrPrefix < 0 || cidrPrefix > 32)
                {
                    addresses = [];
                    error = $"地址格式不正确：{ip}";
                    return false;
                }
                row.IP = parts[0];
                row.Mask = PrefixToMask(cidrPrefix);
                result.Add(new RemoteInterfaceAddressConfig { IP = parts[0], Prefix = cidrPrefix });
                continue;
            }
            if (ip == string.Empty || maskText == string.Empty)
            {
                addresses = [];
                error = "IP 地址和子网掩码都需要填写。";
                return false;
            }
            if (!TryMaskOrPrefixToPrefix(maskText, out var prefix))
            {
                addresses = [];
                error = $"子网掩码格式不正确：{ip} {maskText}";
                return false;
            }
            row.Mask = PrefixToMask(prefix);
            result.Add(new RemoteInterfaceAddressConfig { IP = ip, Prefix = prefix });
        }

        addresses = result.ToArray();
        error = string.Empty;
        return addresses.Length > 0;
    }

    private bool TryBuildRoutes(InterfaceEditor editor, out RemoteInterfaceRouteConfig[] routes, out string error)
    {
        var result = new List<RemoteInterfaceRouteConfig>();
        if (editor.DefaultGatewayEnabled)
        {
            var gateway = editor.DefaultGateway.Trim();
            if (gateway == string.Empty)
            {
                routes = [];
                error = "启用默认网关时，网关地址不能为空。";
                return false;
            }
            result.Add(new RemoteInterfaceRouteConfig { To = "default", Via = gateway });
        }
        if (editor.CustomRoutesEnabled)
        {
            foreach (var row in editor.Routes)
            {
                var to = row.To.Trim();
                var maskText = row.Mask.Trim();
                var via = row.Via.Trim();
                if (to == string.Empty && maskText == string.Empty && via == string.Empty)
                {
                    continue;
                }
                if (to.Contains('/'))
                {
                    var parts = to.Split('/', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
                    if (parts.Length != 2 || !int.TryParse(parts[1], out var cidrPrefix) || cidrPrefix < 0 || cidrPrefix > 32)
                    {
                        routes = [];
                        error = $"自定义路由目标网段格式不正确：{to}";
                        return false;
                    }
                    to = parts[0];
                    maskText = PrefixToMask(cidrPrefix);
                    row.To = to;
                    row.Mask = maskText;
                }
                if (to == string.Empty || maskText == string.Empty || via == string.Empty)
                {
                    routes = [];
                    error = "自定义路由的目标网段、子网掩码和网关地址都需要填写。";
                    return false;
                }
                if (!TryMaskOrPrefixToPrefix(maskText, out var prefix))
                {
                    routes = [];
                    error = $"自定义路由子网掩码格式不正确：{to} {maskText}";
                    return false;
                }
                row.Mask = PrefixToMask(prefix);
                result.Add(new RemoteInterfaceRouteConfig { To = $"{to}/{prefix}", Via = via });
            }
        }

        routes = result.ToArray();
        error = string.Empty;
        return true;
    }

    private static bool TryParseAddresses(string text, out RemoteInterfaceAddressConfig[] addresses, out string error)
    {
        var result = new List<RemoteInterfaceAddressConfig>();
        foreach (var line in ParseListText(text))
        {
            var parts = line.Split(' ', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
            if (parts.Length == 1 && line.Contains('/'))
            {
                var cidrParts = line.Split('/', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
                if (cidrParts.Length != 2 || !int.TryParse(cidrParts[1], out var prefix) || prefix < 0 || prefix > 32)
                {
                    addresses = [];
                    error = $"地址格式不正确：{line}";
                    return false;
                }
                result.Add(new RemoteInterfaceAddressConfig { IP = cidrParts[0], Prefix = prefix });
                continue;
            }

            if (parts.Length != 2)
            {
                addresses = [];
                error = $"地址格式不正确：{line}";
                return false;
            }
            if (!TryMaskOrPrefixToPrefix(parts[1], out var parsedPrefix))
            {
                addresses = [];
                error = $"子网掩码或前缀格式不正确：{line}";
                return false;
            }
            result.Add(new RemoteInterfaceAddressConfig { IP = parts[0], Prefix = parsedPrefix });
        }

        addresses = result.ToArray();
        error = string.Empty;
        return addresses.Length > 0;
    }

    private static bool TryParseRoutes(string text, out RemoteInterfaceRouteConfig[] routes, out string error)
    {
        var result = new List<RemoteInterfaceRouteConfig>();
        foreach (var line in ParseListText(text))
        {
            var parts = line.Split(' ', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
            if (parts.Length == 1)
            {
                result.Add(new RemoteInterfaceRouteConfig { To = "default", Via = parts[0] });
                continue;
            }
            if (parts.Length == 3 && parts[1].Equals("via", StringComparison.OrdinalIgnoreCase))
            {
                result.Add(new RemoteInterfaceRouteConfig { To = parts[0], Via = parts[2] });
                continue;
            }

            routes = [];
            error = $"路由格式不正确：{line}";
            return false;
        }

        routes = result.ToArray();
        error = string.Empty;
        return true;
    }

    private static string[] ParseListText(string text)
    {
        return text.Split(['\r', '\n', ',', ';'], StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
    }

    private static bool TryMaskOrPrefixToPrefix(string text, out int prefix)
    {
        if (int.TryParse(text, out prefix) && prefix >= 0 && prefix <= 32)
        {
            return true;
        }
        return TryMaskToPrefix(text, out prefix);
    }

    private static string PrefixToMask(int prefix)
    {
        if (prefix < 0 || prefix > 32)
        {
            return string.Empty;
        }

        var mask = prefix == 0 ? 0u : uint.MaxValue << (32 - prefix);
        return string.Join('.', new[] { (mask >> 24) & 255, (mask >> 16) & 255, (mask >> 8) & 255, mask & 255 });
    }

    private static bool TryMaskToPrefix(string maskText, out int prefix)
    {
        prefix = 0;
        if (string.IsNullOrWhiteSpace(maskText))
        {
            return false;
        }

        var parts = maskText.Trim().Split('.');
        if (parts.Length != 4)
        {
            return false;
        }

        uint mask = 0;
        foreach (var part in parts)
        {
            if (!byte.TryParse(part, out var octet))
            {
                return false;
            }

            mask = (mask << 8) | octet;
        }

        var seenZero = false;
        for (var i = 31; i >= 0; i--)
        {
            var bit = (mask & (1u << i)) != 0;
            if (bit && seenZero)
            {
                return false;
            }

            if (bit)
            {
                prefix++;
            }
            else
            {
                seenZero = true;
            }
        }

        return true;
    }

    private void ConfigInputChanged_OnChanged(object sender, TextChangedEventArgs e)
    {
        if (_suppressConfigChangeHandling)
        {
            return;
        }

        _configValidated = false;
        ShowStatusMessage("配置内容已变更，请重新点击“2. 校验配置”。");
        UpdateButtonStates();
    }

    private void ConfigModeChanged_OnChanged(object sender, RoutedEventArgs e)
    {
        if (_suppressConfigChangeHandling)
        {
            UpdateButtonStates();
            return;
        }

        _configValidated = false;
        _configDirty = true;
        ShowStatusMessage("配置模式已变更，请重新点击“2. 校验配置”。");
        UpdateButtonStates();
    }

    private void GatewayOrRouteModeChanged_OnChanged(object sender, RoutedEventArgs e)
    {
        if (_suppressConfigChangeHandling)
        {
            UpdateButtonStates();
            return;
        }

        _configValidated = false;
        _configDirty = true;
        ShowStatusMessage("配置内容已变更，请重新点击“2. 校验配置”。");
        UpdateButtonStates();
    }

    private void ConfigGrid_OnCellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
    {
        if (e.Row.Item is EditableAddress address)
        {
            NormalizeAddressRow(address);
        }
        else if (e.Row.Item is EditableRoute route)
        {
            NormalizeRouteRow(route);
        }
        MarkConfigChanged("配置内容已变更，请重新点击“2. 校验配置”。");
    }

    private void DataGrid_OnPreviewMouseWheel(object sender, MouseWheelEventArgs e)
    {
        if (sender is not DataGrid dataGrid)
        {
            return;
        }

        e.Handled = true;
        var eventArg = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta)
        {
            RoutedEvent = MouseWheelEvent,
            Source = dataGrid,
        };
        ContentScrollViewer.RaiseEvent(eventArg);
    }

    private void AddAddressButton_OnClick(object sender, RoutedEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is not InterfaceEditor editor)
        {
            return;
        }
        editor.Addresses.Add(new EditableAddress(editor) { Mask = "255.255.255.0" });
        MarkConfigChanged("已添加 IP 地址，请填写后重新校验配置。");
    }

    private void AddRouteButton_OnClick(object sender, RoutedEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is not InterfaceEditor editor)
        {
            return;
        }
        editor.Routes.Add(new EditableRoute(editor));
        MarkConfigChanged("已添加路由，请填写后重新校验配置。");
    }

    private void AddDnsButton_OnClick(object sender, RoutedEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is not InterfaceEditor editor)
        {
            return;
        }
        editor.Dns.Add(new EditableDns(editor));
        MarkConfigChanged("已添加 DNS，请填写后重新校验配置。");
    }

    private void DeleteAddressButton_OnClick(object sender, RoutedEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is not EditableAddress address)
        {
            return;
        }
        address.Owner.Addresses.Remove(address);
        MarkConfigChanged("已删除 IP 地址，请重新校验配置。");
    }

    private void DeleteRouteButton_OnClick(object sender, RoutedEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is EditableRoute route)
        {
            route.Owner.Routes.Remove(route);
            MarkConfigChanged("已删除路由，请重新校验配置。");
        }
    }

    private void DeleteDnsButton_OnClick(object sender, RoutedEventArgs e)
    {
        if ((sender as FrameworkElement)?.DataContext is EditableDns dns)
        {
            dns.Owner.Dns.Remove(dns);
            MarkConfigChanged("已删除 DNS，请重新校验配置。");
        }
    }

    private void MarkConfigChanged(string message)
    {
        if (_suppressConfigChangeHandling)
        {
            return;
        }

        _configValidated = false;
        _configDirty = true;
        ShowStatusMessage(message);
        UpdateButtonStates();
    }

    private static void NormalizeAddressRow(EditableAddress row)
    {
        var ip = row.IP.Trim();
        if (!ip.Contains('/'))
        {
            return;
        }
        var parts = ip.Split('/', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
        if (parts.Length == 2 && int.TryParse(parts[1], out var prefix) && prefix >= 0 && prefix <= 32)
        {
            row.IP = parts[0];
            row.Mask = PrefixToMask(prefix);
        }
    }

    private static void NormalizeRouteRow(EditableRoute row)
    {
        var to = row.To.Trim();
        if (!to.Contains('/'))
        {
            return;
        }
        var parts = to.Split('/', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
        if (parts.Length == 2 && int.TryParse(parts[1], out var prefix) && prefix >= 0 && prefix <= 32)
        {
            row.To = parts[0];
            row.Mask = PrefixToMask(prefix);
        }
    }

    private void ShowStatusMessage(string message)
    {
        ApplyStatusMessageStyle(message);
        StatusMessageTextBlock.Text = message;
        StatusMessageBorder.Opacity = 0;
        StatusMessageBorder.Visibility = Visibility.Visible;
        StatusMessageBorder.BeginAnimation(OpacityProperty, new DoubleAnimation(1, TimeSpan.FromMilliseconds(160)));
        _statusMessageCts?.Cancel();
        _statusMessageCts = new CancellationTokenSource();
        _ = HideStatusMessageAsync(_statusMessageCts.Token);
    }

    private async Task HideStatusMessageAsync(CancellationToken cancellationToken)
    {
        try
        {
            await Task.Delay(3000, cancellationToken);
            await Dispatcher.InvokeAsync(() =>
            {
                var animation = new DoubleAnimation(0, TimeSpan.FromMilliseconds(200));
                animation.Completed += (_, _) =>
                {
                    if (!cancellationToken.IsCancellationRequested)
                    {
                        StatusMessageBorder.Visibility = Visibility.Collapsed;
                    }
                };
                StatusMessageBorder.BeginAnimation(OpacityProperty, animation);
            });
        }
        catch (TaskCanceledException)
        {
        }
    }

    private void ApplyStatusMessageStyle(string message)
    {
        var (background, foreground) = GetStatusMessageBrushes(message);
        StatusMessageBorder.Background = background;
        StatusMessageTextBlock.Foreground = foreground;
    }

    private static (Brush Background, Brush Foreground) GetStatusMessageBrushes(string message)
    {
        if (ContainsAny(message, "失败", "错误", "拒绝", "超时", "不能为空", "不正确", "无法"))
        {
            return (new SolidColorBrush((Color)ColorConverter.ConvertFromString("#B91C1C")), Brushes.White);
        }

        if (ContainsAny(message, "未发现", "请", "重试", "警告", "需要"))
        {
            return (new SolidColorBrush((Color)ColorConverter.ConvertFromString("#C2410C")), Brushes.White);
        }

        if (ContainsAny(message, "成功", "已切换", "已刷新", "已读取", "已加载", "已发现", "已提交", "已回填"))
        {
            return (new SolidColorBrush((Color)ColorConverter.ConvertFromString("#047857")), Brushes.White);
        }

        return (new SolidColorBrush((Color)ColorConverter.ConvertFromString("#111827")), Brushes.White);
    }

    private static bool ContainsAny(string message, params string[] markers)
    {
        return markers.Any(marker => message.Contains(marker, StringComparison.Ordinal));
    }

    private static string FormatTaskStatusMessage(RemoteTaskResult task)
    {
        return task.Status switch
        {
            "success" => string.IsNullOrWhiteSpace(task.Detail) ? "配置已成功应用。" : task.Detail,
            "failed" => string.IsNullOrWhiteSpace(task.Detail) ? "配置应用失败。" : task.Detail,
            "rolled_back" => string.IsNullOrWhiteSpace(task.Detail) ? "配置应用失败，已自动回滚。" : task.Detail,
            _ => task.Step switch
            {
                "validating" => "正在校验配置...",
                "writing_netplan" => "正在写入 Linux 网络配置...",
                "applying" => "正在应用 Linux 网络配置...",
                "confirming" => string.IsNullOrWhiteSpace(task.Detail) ? "等待确认保留配置..." : task.Detail,
                "rolling_back" => "配置应用失败，正在自动回滚...",
                _ => string.IsNullOrWhiteSpace(task.Detail) ? "正在处理，请稍候..." : task.Detail,
            }
        };
    }

    private void ShowTaskCompletionDialog(RemoteTaskResult task)
    {
        var message = FormatTaskStatusMessage(task);
        var title = task.Status == "success" ? "应用配置成功" : "应用配置失败";
        var image = task.Status == "success" ? MessageBoxImage.Information : MessageBoxImage.Warning;
        MessageBox.Show(this, message, title, MessageBoxButton.OK, image);
    }

    private void UpdateButtonStates()
    {
        var hasInterfaces = _interfaces.Count > 0;
        InterfacesItemsControl.IsEnabled = !_isBusy && hasInterfaces;
        ReloadInterfaceConfigButton.IsEnabled = !_isBusy && hasInterfaces;
        ValidateConfigButton.IsEnabled = !_isBusy && hasInterfaces;
        ApplyConfigButton.IsEnabled = !_isBusy && _configValidated && hasInterfaces;
        RebootButton.IsEnabled = !_isBusy;
        ShutdownButton.IsEnabled = !_isBusy;
    }

    private void SetBusyState(bool isBusy, string? message = null)
    {
        _isBusy = isBusy;
        BusyOverlay.Visibility = isBusy ? Visibility.Visible : Visibility.Collapsed;
        BusyMessageTextBlock.Text = string.IsNullOrWhiteSpace(message) ? "正在处理，请稍候..." : message;
        UpdateButtonStates();
    }

    private sealed class InterfaceEditor : INotifyPropertyChanged
    {
        private bool _dhcp4;
        private bool _defaultGatewayEnabled;
        private bool _customRoutesEnabled;
        private string _defaultGateway = string.Empty;

        public InterfaceEditor(RemoteInterfaceInfo info)
        {
            SystemName = info.SystemName;
            StatusSummary = info.StatusSummary;
            LinkUp = info.LinkUp;
        }

        public string SystemName { get; }
        public string StatusSummary { get; }
        public bool LinkUp { get; }
        public ObservableCollection<EditableAddress> Addresses { get; } = [];
        public ObservableCollection<EditableRoute> Routes { get; } = [];
        public ObservableCollection<EditableDns> Dns { get; } = [];

        public bool Dhcp4
        {
            get => _dhcp4;
            set => SetField(ref _dhcp4, value);
        }

        public bool DefaultGatewayEnabled
        {
            get => _defaultGatewayEnabled;
            set => SetField(ref _defaultGatewayEnabled, value);
        }

        public bool CustomRoutesEnabled
        {
            get => _customRoutesEnabled;
            set => SetField(ref _customRoutesEnabled, value);
        }

        public string DefaultGateway
        {
            get => _defaultGateway;
            set => SetField(ref _defaultGateway, value);
        }

        public event PropertyChangedEventHandler? PropertyChanged;

        private void SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = "")
        {
            if (EqualityComparer<T>.Default.Equals(field, value))
            {
                return;
            }
            field = value;
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    private sealed class EditableAddress : INotifyPropertyChanged
    {
        private string _ip = string.Empty;
        private string _mask = string.Empty;

        public EditableAddress(InterfaceEditor owner)
        {
            Owner = owner;
        }

        public InterfaceEditor Owner { get; }

        public string IP
        {
            get => _ip;
            set => SetField(ref _ip, value);
        }

        public string Mask
        {
            get => _mask;
            set => SetField(ref _mask, value);
        }

        public event PropertyChangedEventHandler? PropertyChanged;

        private void SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = "")
        {
            if (EqualityComparer<T>.Default.Equals(field, value))
            {
                return;
            }
            field = value;
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    private sealed class EditableRoute
    {
        public EditableRoute(InterfaceEditor owner)
        {
            Owner = owner;
        }

        public InterfaceEditor Owner { get; }
        public string To { get; set; } = string.Empty;
        public string Mask { get; set; } = string.Empty;
        public string Via { get; set; } = string.Empty;
    }

    private sealed class EditableDns
    {
        public EditableDns(InterfaceEditor owner)
        {
            Owner = owner;
        }

        public InterfaceEditor Owner { get; }
        public string Address { get; set; } = string.Empty;
    }
}