using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Windows.Forms;

namespace MesDbBackup
{
    /// <summary>
    /// MES 数据库备份桌面客户端：窗口内完成连接、选目录和备份，不打开浏览器。
    /// 实际导出仍调用 backup-db.ps1，不改原备份逻辑。
    /// </summary>
    internal static class Program
    {
        internal const string MutexName = "Global\\MES_Cloud_DB_Backup_UI";
        internal const string MarkerName = ".packed-by-mes-backup";

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            bool createdNew;
            using (var mutex = new Mutex(true, MutexName, out createdNew))
            {
                if (!createdNew)
                {
                    MessageBox.Show(
                        "备份客户端已经在运行，请查看任务栏。",
                        "MES 数据库备份",
                        MessageBoxButtons.OK,
                        MessageBoxIcon.Information);
                    return;
                }
                Application.Run(new MainForm());
            }
        }
    }

    /// <summary>
    /// 深空 AI 主题：暗底玻璃卡片 + 青绿/紫罗兰高光。
    /// </summary>
    internal static class Theme
    {
        public static readonly Color Bg = Color.FromArgb(7, 8, 13);
        public static readonly Color Header = Color.FromArgb(9, 12, 20);
        public static readonly Color HeaderText = Color.FromArgb(238, 244, 255);
        public static readonly Color HeaderMuted = Color.FromArgb(139, 149, 171);
        public static readonly Color Cyan = Color.FromArgb(94, 234, 212);
        public static readonly Color CyanDeep = Color.FromArgb(34, 211, 238);
        public static readonly Color Violet = Color.FromArgb(129, 140, 248);
        public static readonly Color Ink = Color.FromArgb(6, 16, 24);
        public static readonly Color Gold = Color.FromArgb(94, 234, 212);
        public static readonly Color Card = Color.FromArgb(18, 22, 32);
        public static readonly Color Line = Color.FromArgb(48, 80, 92, 108);
        public static readonly Color GhostBorder = Color.FromArgb(70, 255, 255, 255);
        public static readonly Color Text = Color.FromArgb(238, 244, 255);
        public static readonly Color Muted = Color.FromArgb(139, 149, 171);
        public static readonly Color Accent = Color.FromArgb(34, 211, 238);
        public static readonly Color AccentHover = Color.FromArgb(94, 234, 212);
        public static readonly Color Ok = Color.FromArgb(52, 211, 153);
        public static readonly Color Warn = Color.FromArgb(251, 191, 36);
        public static readonly Color Bad = Color.FromArgb(251, 113, 133);
        public static readonly Color Input = Color.FromArgb(8, 10, 16);
        public static readonly Color InputMuted = Color.FromArgb(12, 16, 24);
        public static readonly Color Go = Color.FromArgb(34, 211, 238);
        public static readonly Color LogBg = Color.FromArgb(5, 7, 12);
        public static readonly Color LogText = Color.FromArgb(159, 232, 220);
        public static readonly Color Shadow = Color.FromArgb(90, 0, 0, 0);
        public static readonly Color Mesh = Color.FromArgb(18, 148, 163, 184);
        public static readonly Font Ui = new Font("Microsoft YaHei UI", 10F);
        public static readonly Font Title = new Font("Microsoft YaHei UI", 16F, FontStyle.Bold);
        public static readonly Font Caption = new Font("Microsoft YaHei UI", 8.5F);
        public static readonly Font Section = new Font("Microsoft YaHei UI", 11F, FontStyle.Bold);
        public static readonly Font Mono = new Font("Consolas", 9F);
        public static readonly Font Mark = new Font("Segoe UI", 16F, FontStyle.Bold);

        public static GraphicsPath RoundRect(Rectangle bounds, int radius)
        {
            var path = new GraphicsPath();
            int d = Math.Max(2, radius * 2);
            path.AddArc(bounds.X, bounds.Y, d, d, 180, 90);
            path.AddArc(bounds.Right - d, bounds.Y, d, d, 270, 90);
            path.AddArc(bounds.Right - d, bounds.Bottom - d, d, d, 0, 90);
            path.AddArc(bounds.X, bounds.Bottom - d, d, d, 90, 90);
            path.CloseFigure();
            return path;
        }
    }

    /// <summary>
    /// 暗色玻璃卡片，顶部一道青绿高光。
    /// </summary>
    internal sealed class CardPanel : Panel
    {
        public CardPanel()
        {
            SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);
            BackColor = Color.Transparent;
            Padding = new Padding(8);
            Margin = new Padding(0, 0, 0, 12);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            var rect = new Rectangle(8, 4, Math.Max(8, Width - 18), Math.Max(8, Height - 12));
            using (GraphicsPath shadow = Theme.RoundRect(new Rectangle(rect.X + 3, rect.Y + 6, rect.Width, rect.Height), 16))
            using (var brush = new SolidBrush(Theme.Shadow))
            {
                e.Graphics.FillPath(brush, shadow);
            }
            using (GraphicsPath path = Theme.RoundRect(rect, 16))
            using (var fill = new SolidBrush(Theme.Card))
            using (var pen = new Pen(Color.FromArgb(55, 94, 234, 212)))
            {
                e.Graphics.FillPath(fill, path);
                e.Graphics.DrawPath(pen, path);
            }
            using (var glow = new Pen(Color.FromArgb(140, 94, 234, 212), 1F))
            {
                e.Graphics.DrawLine(glow, rect.X + 18, rect.Y + 1, rect.Right - 18, rect.Y + 1);
            }
        }
    }

    /// <summary>
    /// 青绿渐变进度条，替代系统默认绿条。
    /// </summary>
    internal sealed class AiProgressBar : Control
    {
        int _value;
        int _phase;
        ProgressBarStyle _style = ProgressBarStyle.Continuous;
        readonly System.Windows.Forms.Timer _tick;

        public int Minimum;
        public int Maximum = 100;

        public AiProgressBar()
        {
            SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);
            Height = 8;
            _tick = new System.Windows.Forms.Timer();
            _tick.Interval = 28;
            _tick.Tick += delegate
            {
                _phase = (_phase + 5) % 400;
                Invalidate();
            };
        }

        public int Value
        {
            get { return _value; }
            set
            {
                _value = Math.Max(Minimum, Math.Min(Maximum, value));
                Invalidate();
            }
        }

        public ProgressBarStyle Style
        {
            get { return _style; }
            set
            {
                _style = value;
                if (_style == ProgressBarStyle.Marquee)
                {
                    _tick.Start();
                }
                else
                {
                    _tick.Stop();
                }
                Invalidate();
            }
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            if (Width < 4 || Height < 4)
            {
                return;
            }
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            var bg = new Rectangle(0, 0, Math.Max(1, Width - 1), Math.Max(1, Height - 1));
            using (GraphicsPath path = Theme.RoundRect(bg, Math.Max(2, Height / 2)))
            using (var fill = new SolidBrush(Color.FromArgb(255, 12, 16, 24)))
            {
                e.Graphics.FillPath(fill, path);
            }
            if (_style == ProgressBarStyle.Marquee)
            {
                int w = Math.Max(48, Width / 3);
                int x = (_phase * (Width + w) / 400) - w;
                using (var lg = new LinearGradientBrush(new Rectangle(x, 0, w, Height), Theme.CyanDeep, Theme.Violet, 0f))
                {
                    e.Graphics.FillRectangle(lg, new Rectangle(x, 1, w, Math.Max(1, Height - 2)));
                }
            }
            else if (_value > 0 && Maximum > 0)
            {
                int w = Math.Max(4, (int)((Width - 2) * (_value / (double)Maximum)));
                using (var lg = new LinearGradientBrush(new Rectangle(0, 0, w, Height), Theme.CyanDeep, Theme.Violet, 0f))
                using (GraphicsPath path = Theme.RoundRect(new Rectangle(0, 0, w, Math.Max(1, Height - 1)), Math.Max(2, Height / 2)))
                {
                    e.Graphics.FillPath(lg, path);
                }
            }
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                _tick.Dispose();
            }
            base.Dispose(disposing);
        }
    }

    internal sealed class DbConfig
    {
        public string Engine = "mysql";
        public string Host = "127.0.0.1";
        public int Port = 3306;
        public string Database = "mes_cloud";
        public string User = "mes_cloud";
        public string Password = "s2ENj7KaEySTC7dW";
    }

    internal static class DbConfigStore
    {
        public static string ConfigPath(string workDir)
        {
            return Path.Combine(workDir, "db-config.json");
        }

        public static DbConfig Load(string workDir)
        {
            string path = ConfigPath(workDir);
            if (!File.Exists(path))
            {
                return new DbConfig();
            }
            try
            {
                string raw = File.ReadAllText(path, Encoding.UTF8);
                var lines = new List<string>();
                foreach (string line in raw.Split(new[] { "\r\n", "\n" }, StringSplitOptions.None))
                {
                    if (!line.TrimStart().StartsWith("#"))
                    {
                        lines.Add(line);
                    }
                }
                string json = string.Join("\n", lines.ToArray()).Trim();
                int start = json.IndexOf('{');
                int end = json.LastIndexOf('}');
                if (start >= 0 && end > start)
                {
                    json = json.Substring(start, end - start + 1);
                }
                var cfg = new DbConfig();
                cfg.Host = ReadString(json, "host", cfg.Host);
                cfg.Database = ReadString(json, "database", cfg.Database);
                cfg.User = ReadString(json, "user", cfg.User);
                cfg.Password = ReadString(json, "password", cfg.Password);
                int port = ReadInt(json, "port", cfg.Port);
                if (port < 1 || port > 65535)
                {
                    throw new Exception("端口必须在 1-65535");
                }
                cfg.Port = port;
                cfg.Host = NormalizeHost(cfg.Host);
                if (string.IsNullOrWhiteSpace(cfg.User))
                {
                    throw new Exception("请填写账号");
                }
                return cfg;
            }
            catch
            {
                return new DbConfig();
            }
        }

        public static void Save(string workDir, DbConfig cfg)
        {
            cfg.Host = NormalizeHost(cfg.Host);
            if (string.IsNullOrWhiteSpace(cfg.User))
            {
                throw new Exception("请填写账号");
            }
            if (cfg.Port < 1 || cfg.Port > 65535)
            {
                throw new Exception("端口必须在 1-65535");
            }
            string json =
                "{\r\n" +
                "    \"engine\":  \"mysql\",\r\n" +
                "    \"host\":  \"" + Escape(cfg.Host) + "\",\r\n" +
                "    \"port\":  " + cfg.Port + ",\r\n" +
                "    \"database\":  \"" + Escape(cfg.Database) + "\",\r\n" +
                "    \"user\":  \"" + Escape(cfg.User) + "\",\r\n" +
                "    \"password\":  \"" + Escape(cfg.Password) + "\"\r\n" +
                "}";
            File.WriteAllText(ConfigPath(workDir), json, new UTF8Encoding(false));
        }

        static string NormalizeHost(string host)
        {
            if (string.IsNullOrWhiteSpace(host))
            {
                return "127.0.0.1";
            }
            host = host.Trim();
            Match jdbc = Regex.Match(host, @"jdbc:mysql://([^:/]+)");
            if (jdbc.Success)
            {
                host = jdbc.Groups[1].Value;
            }
            if (host.StartsWith("mysql://", StringComparison.OrdinalIgnoreCase))
            {
                host = host.Substring(8);
            }
            if (Regex.IsMatch(host, @"\s|/"))
            {
                throw new Exception("IP/主机名不合法");
            }
            return host;
        }

        static string ReadString(string json, string key, string fallback)
        {
            Match m = Regex.Match(json, "\"" + key + "\"\\s*:\\s*\"((?:\\\\.|[^\"\\\\])*)\"");
            if (!m.Success)
            {
                return fallback;
            }
            return Unescape(m.Groups[1].Value);
        }

        static int ReadInt(string json, string key, int fallback)
        {
            Match m = Regex.Match(json, "\"" + key + "\"\\s*:\\s*(-?\\d+)");
            int n;
            if (m.Success && int.TryParse(m.Groups[1].Value, out n))
            {
                return n;
            }
            return fallback;
        }

        static string Escape(string s)
        {
            if (s == null)
            {
                return "";
            }
            return s.Replace("\\", "\\\\").Replace("\"", "\\\"").Replace("\r", "\\r").Replace("\n", "\\n");
        }

        static string Unescape(string s)
        {
            var sb = new StringBuilder();
            for (int i = 0; i < s.Length; i++)
            {
                if (s[i] == '\\' && i + 1 < s.Length)
                {
                    char n = s[++i];
                    if (n == '"') { sb.Append('"'); }
                    else if (n == '\\') { sb.Append('\\'); }
                    else if (n == 'n') { sb.Append('\n'); }
                    else if (n == 'r') { sb.Append('\r'); }
                    else if (n == 't') { sb.Append('\t'); }
                    else { sb.Append(n); }
                }
                else
                {
                    sb.Append(s[i]);
                }
            }
            return sb.ToString();
        }
    }

    internal static class MysqlUtil
    {
        static readonly Dictionary<string, string> Cache = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);

        public static string FindTool(string name)
        {
            if (Cache.ContainsKey(name))
            {
                return Cache[name];
            }
            string exeName = name.EndsWith(".exe", StringComparison.OrdinalIgnoreCase) ? name : name + ".exe";
            string pathEnv = Environment.GetEnvironmentVariable("PATH") ?? "";
            foreach (string dir in pathEnv.Split(new[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
            {
                try
                {
                    string p = Path.Combine(dir.Trim().Trim('"'), exeName);
                    if (File.Exists(p))
                    {
                        Cache[name] = p;
                        return p;
                    }
                }
                catch { }
            }
            string[] roots = new[]
            {
                @"C:\Program Files\MySQL",
                @"C:\Program Files (x86)\MySQL",
                @"C:\mysql",
                @"D:\MySQL",
                @"E:\MySQL",
                @"C:\Program Files\MariaDB"
            };
            foreach (string root in roots)
            {
                if (!Directory.Exists(root))
                {
                    continue;
                }
                try
                {
                    foreach (string file in Directory.GetFiles(root, exeName, SearchOption.AllDirectories))
                    {
                        string bin = Path.GetFileName(Path.GetDirectoryName(file));
                        if (string.Equals(bin, "bin", StringComparison.OrdinalIgnoreCase))
                        {
                            Cache[name] = file;
                            return file;
                        }
                    }
                }
                catch { }
            }
            return null;
        }

        public static void WriteCnf(DbConfig cfg, string cnfPath)
        {
            string pwd = cfg.Password ?? "";
            pwd = pwd.Replace("\\", "\\\\").Replace("\"", "\\\"");
            string text =
                "[client]\r\n" +
                "host=" + cfg.Host + "\r\n" +
                "port=" + cfg.Port + "\r\n" +
                "user=" + cfg.User + "\r\n" +
                "password=\"" + pwd + "\"\r\n" +
                "default-character-set=utf8mb4\r\n";
            File.WriteAllText(cnfPath, text, Encoding.ASCII);
        }

        public static string TestConnection(DbConfig cfg)
        {
            string mysql = FindTool("mysql");
            if (mysql == null)
            {
                throw new Exception("找不到 mysql.exe，请安装 MySQL 客户端");
            }
            string cnf = Path.Combine(Path.GetTempPath(), "mes_ui_test_" + Process.GetCurrentProcess().Id + ".cnf");
            WriteCnf(cfg, cnf);
            try
            {
                string output;
                int code = Run(mysql, new[]
                {
                    "--defaults-extra-file=" + cnf,
                    "--connect-timeout=5",
                    "-N", "-s", "-e", "SELECT 1"
                }, 15000, out output);
                if (code != 0)
                {
                    throw new Exception("连接失败: " + (output ?? "").Trim());
                }
            }
            finally
            {
                TryDelete(cnf);
            }
            return "MySQL 连接成功: " + cfg.Host + ":" + cfg.Port + " / " + cfg.Database;
        }

        public static long GetDbSizeBytes(DbConfig cfg)
        {
            try
            {
                string mysql = FindTool("mysql");
                if (mysql == null)
                {
                    return 0;
                }
                string cnf = Path.Combine(Path.GetTempPath(), "mes_ui_size_" + Process.GetCurrentProcess().Id + ".cnf");
                WriteCnf(cfg, cnf);
                try
                {
                    string db = (cfg.Database ?? "").Replace("'", "''");
                    string sql = "SELECT IFNULL(SUM(data_length+index_length),0) FROM information_schema.tables WHERE table_schema='" + db + "'";
                    string output;
                    int code = Run(mysql, new[]
                    {
                        "--defaults-extra-file=" + cnf,
                        "--connect-timeout=3",
                        "-N", "-s", "-e", sql
                    }, 8000, out output);
                    if (code != 0)
                    {
                        return 0;
                    }
                    long n;
                    if (long.TryParse((output ?? "").Trim(), out n))
                    {
                        return n;
                    }
                }
                finally
                {
                    TryDelete(cnf);
                }
            }
            catch { }
            return 0;
        }

        static int Run(string file, string[] args, int timeoutMs, out string output)
        {
            var psi = new ProcessStartInfo();
            psi.FileName = file;
            psi.Arguments = QuoteArgs(args);
            psi.UseShellExecute = false;
            psi.CreateNoWindow = true;
            psi.RedirectStandardOutput = true;
            psi.RedirectStandardError = true;
            psi.StandardOutputEncoding = Encoding.UTF8;
            psi.StandardErrorEncoding = Encoding.UTF8;
            using (var proc = new Process())
            {
                proc.StartInfo = psi;
                var sb = new StringBuilder();
                proc.OutputDataReceived += delegate(object s, DataReceivedEventArgs e)
                {
                    if (!string.IsNullOrEmpty(e.Data)) { sb.AppendLine(e.Data); }
                };
                proc.ErrorDataReceived += delegate(object s, DataReceivedEventArgs e)
                {
                    if (!string.IsNullOrEmpty(e.Data)) { sb.AppendLine(e.Data); }
                };
                proc.Start();
                proc.BeginOutputReadLine();
                proc.BeginErrorReadLine();
                if (!proc.WaitForExit(timeoutMs))
                {
                    try { proc.Kill(); } catch { }
                    throw new Exception("等待超时");
                }
                proc.WaitForExit();
                output = sb.ToString();
                return proc.ExitCode;
            }
        }

        static string QuoteArgs(string[] args)
        {
            var sb = new StringBuilder();
            for (int i = 0; i < args.Length; i++)
            {
                if (i > 0) { sb.Append(' '); }
                string a = args[i] ?? "";
                sb.Append('"').Append(a.Replace("\"", "\\\"")).Append('"');
            }
            return sb.ToString();
        }

        static void TryDelete(string path)
        {
            try { if (File.Exists(path)) { File.Delete(path); } } catch { }
        }
    }

    internal sealed class MainForm : Form
    {
        static readonly string[] PackedFiles = new string[]
        {
            "backup-ui-server.ps1",
            "backup-db.ps1",
            "db-config.ps1",
            "backup-ui.html",
            "restore-db.ps1",
            "install-backup-task.bat",
            "使用说明.txt"
        };

        readonly string _workDir;
        readonly TextBox _host;
        readonly TextBox _port;
        readonly TextBox _database;
        readonly TextBox _user;
        readonly TextBox _password;
        readonly Label _cfgStatus;
        readonly Label _picked;
        readonly Label _spaceHint;
        readonly Label _progHint;
        readonly Label _runStatus;
        readonly CheckBox _keepOld;
        readonly AiProgressBar _bar;
        readonly TextBox _log;
        readonly Button _btnTest;
        readonly Button _btnSave;
        readonly Button _btnBrowse;
        readonly Button _btnBackup;
        readonly System.Windows.Forms.Timer _poll;

        string _selectedPath = "";
        Process _backupProc;
        string _outFile = "";
        DateTime _startedAt;
        long _dbBytes;
        bool _running;

        public MainForm()
        {
            string exeDir = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            if (string.IsNullOrEmpty(exeDir))
            {
                exeDir = AppDomain.CurrentDomain.BaseDirectory;
            }
            _workDir = PrepareWorkDir(exeDir);

            Text = "MES 智能备份控制台";
            Font = Theme.Ui;
            BackColor = Theme.Bg;
            ForeColor = Theme.Text;
            StartPosition = FormStartPosition.CenterScreen;
            MinimumSize = new Size(1020, 680);
            Size = new Size(1140, 740);
            DoubleBuffered = true;

            var header = new Panel
            {
                Dock = DockStyle.Top,
                Height = 96,
                BackColor = Theme.Header
            };
            header.Paint += delegate(object s, PaintEventArgs e)
            {
                e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
                e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
                using (var g = new LinearGradientBrush(header.ClientRectangle,
                    Color.FromArgb(10, 14, 24), Color.FromArgb(18, 12, 36), LinearGradientMode.Horizontal))
                {
                    e.Graphics.FillRectangle(g, header.ClientRectangle);
                }
                using (var glow = new Pen(Color.FromArgb(180, 94, 234, 212), 2F))
                {
                    e.Graphics.DrawLine(glow, 0, 0, header.Width, 0);
                }
                using (var line = new Pen(Color.FromArgb(60, 129, 140, 248)))
                {
                    e.Graphics.DrawLine(line, 0, header.Height - 1, header.Width, header.Height - 1);
                }
                var markRect = new Rectangle(26, 24, 48, 48);
                using (GraphicsPath path = Theme.RoundRect(markRect, 14))
                using (var g = new LinearGradientBrush(markRect, Theme.Cyan, Theme.Violet, 145f))
                {
                    e.Graphics.FillPath(g, path);
                }
                TextRenderer.DrawText(e.Graphics, "M", Theme.Mark, markRect, Theme.Ink,
                    TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter);
                TextRenderer.DrawText(e.Graphics, "NEURAL ARCHIVE", Theme.Caption, new Point(86, 16), Theme.Cyan);
                TextRenderer.DrawText(e.Graphics, "MES 智能备份控制台", Theme.Title, new Point(84, 34), Theme.HeaderText);
                TextRenderer.DrawText(e.Graphics, "独立工具  ·  仅 MySQL  ·  不接入生产系统", Theme.Caption, new Point(86, 66), Theme.HeaderMuted);
                string[] chips = new[] { "AIR-GAPPED", "MYSQL", "LOCAL ONLY" };
                int x = header.Width - 22;
                for (int i = 0; i < chips.Length; i++)
                {
                    Size sz = TextRenderer.MeasureText(chips[i], Theme.Caption);
                    int w = sz.Width + 16;
                    x -= w + 8;
                    var chipRect = new Rectangle(x, 36, w, 24);
                    using (GraphicsPath path = Theme.RoundRect(chipRect, 12))
                    using (var fill = new SolidBrush(Color.FromArgb(40, 255, 255, 255)))
                    using (var pen = new Pen(i == 2 ? Color.FromArgb(120, 94, 234, 212) : Color.FromArgb(50, 255, 255, 255)))
                    {
                        e.Graphics.FillPath(fill, path);
                        e.Graphics.DrawPath(pen, path);
                    }
                    TextRenderer.DrawText(e.Graphics, chips[i], Theme.Caption, chipRect,
                        i == 2 ? Theme.Cyan : Theme.Muted,
                        TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter);
                }
            };

            var grid = new TableLayoutPanel();
            grid.Dock = DockStyle.Fill;
            grid.ColumnCount = 2;
            grid.RowCount = 1;
            grid.BackColor = Theme.Bg;
            grid.Padding = new Padding(18, 12, 14, 12);
            grid.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 56F));
            grid.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 44F));
            grid.RowStyles.Add(new RowStyle(SizeType.Percent, 100F));
            grid.Paint += PaintMesh;

            _host = MakeInput();
            _port = MakeInput();
            _database = MakeInput();
            _user = MakeInput();
            _password = MakeInput();
            _password.UseSystemPasswordChar = true;
            var engine = MakeInput();
            engine.Text = "MySQL";
            engine.ReadOnly = true;
            engine.BackColor = Theme.InputMuted;
            engine.ForeColor = Theme.Muted;
            engine.TabStop = false;

            var connCard = MakeCard();
            var connBody = MakeBody();
            connBody.RowCount = 4;
            connBody.RowStyles.Add(new RowStyle(SizeType.Absolute, 36));
            connBody.RowStyles.Add(new RowStyle(SizeType.Percent, 100F));
            connBody.RowStyles.Add(new RowStyle(SizeType.Absolute, 42));
            connBody.RowStyles.Add(new RowStyle(SizeType.Absolute, 24));
            var connHead = MakeHead("01", "连接矩阵", "先测试，再保存", null);
            var form = new TableLayoutPanel();
            form.Dock = DockStyle.Fill;
            form.ColumnCount = 2;
            form.RowCount = 3;
            form.BackColor = Theme.Card;
            form.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50F));
            form.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 50F));
            for (int i = 0; i < 3; i++)
            {
                form.RowStyles.Add(new RowStyle(SizeType.Percent, 33.3F));
            }
            form.Controls.Add(MakeField("类型", engine), 0, 0);
            form.Controls.Add(MakeField("端口", _port), 1, 0);
            form.Controls.Add(MakeField("IP / 主机", _host), 0, 1);
            form.Controls.Add(MakeField("库名", _database), 1, 1);
            form.Controls.Add(MakeField("账号", _user), 0, 2);
            form.Controls.Add(MakeField("密码", _password), 1, 2);
            var connActions = new Panel { Dock = DockStyle.Fill, BackColor = Theme.Card };
            _btnTest = MakeButton("测试连接", false);
            _btnTest.Location = new Point(4, 4);
            _btnSave = MakeGoldButton("保存配置");
            _btnSave.Location = new Point(122, 4);
            _btnTest.Click += OnTest;
            _btnSave.Click += OnSave;
            connActions.Controls.Add(_btnTest);
            connActions.Controls.Add(_btnSave);
            _cfgStatus = new Label
            {
                Dock = DockStyle.Fill,
                TextAlign = ContentAlignment.MiddleLeft,
                ForeColor = Theme.Muted,
                BackColor = Theme.Card,
                Padding = new Padding(6, 0, 0, 0),
                Text = "填写 IP、账号、密码后点「测试连接」"
            };
            connBody.Controls.Add(connHead, 0, 0);
            connBody.Controls.Add(form, 0, 1);
            connBody.Controls.Add(connActions, 0, 2);
            connBody.Controls.Add(_cfgStatus, 0, 3);
            connCard.Controls.Add(connBody);

            var bakCard = MakeCard();
            var bakBody = MakeBody();
            bakBody.RowCount = 7;
            bakBody.RowStyles.Add(new RowStyle(SizeType.Absolute, 40));
            bakBody.RowStyles.Add(new RowStyle(SizeType.Percent, 100F));
            bakBody.RowStyles.Add(new RowStyle(SizeType.Absolute, 22));
            bakBody.RowStyles.Add(new RowStyle(SizeType.Absolute, 28));
            bakBody.RowStyles.Add(new RowStyle(SizeType.Absolute, 12));
            bakBody.RowStyles.Add(new RowStyle(SizeType.Absolute, 22));
            bakBody.RowStyles.Add(new RowStyle(SizeType.Absolute, 48));
            _btnBrowse = MakeButton("浏览文件夹", false);
            _btnBrowse.Width = 128;
            _btnBrowse.Click += OnBrowse;
            var bakHead = MakeHead("02", "归档目标", null, _btnBrowse);
            _picked = new Label
            {
                Dock = DockStyle.Fill,
                BackColor = Theme.Input,
                ForeColor = Theme.Muted,
                Text = "  尚未选择保存位置",
                TextAlign = ContentAlignment.MiddleLeft,
                Padding = new Padding(12, 0, 12, 0)
            };
            _picked.Paint += delegate(object s, PaintEventArgs e)
            {
                using (var p = new Pen(Color.FromArgb(90, 94, 234, 212)) { DashStyle = DashStyle.Dash })
                {
                    e.Graphics.DrawRectangle(p, 1, 1, _picked.Width - 3, _picked.Height - 3);
                }
            };
            _spaceHint = new Label
            {
                Dock = DockStyle.Fill,
                ForeColor = Theme.Muted,
                BackColor = Theme.Card,
                TextAlign = ContentAlignment.MiddleLeft,
                Text = "插入 U 盘或移动硬盘后选择目录，无需手输路径。"
            };
            _keepOld = new CheckBox
            {
                Text = "同时删除该目录中超过 7 天的旧备份（U 盘建议不勾选）",
                ForeColor = Theme.Muted,
                Dock = DockStyle.Fill,
                BackColor = Theme.Card,
                FlatStyle = FlatStyle.Flat,
                TextAlign = ContentAlignment.MiddleLeft
            };
            _bar = new AiProgressBar
            {
                Dock = DockStyle.Fill,
                Minimum = 0,
                Maximum = 100
            };
            _progHint = new Label
            {
                Dock = DockStyle.Fill,
                ForeColor = Theme.Muted,
                BackColor = Theme.Card,
                TextAlign = ContentAlignment.MiddleLeft,
                Text = ""
            };
            var bakGo = new Panel { Dock = DockStyle.Fill, BackColor = Theme.Card };
            _btnBackup = MakeButton("开始备份", true);
            _btnBackup.Width = 148;
            _btnBackup.Height = 36;
            _btnBackup.Font = new Font("Microsoft YaHei UI", 11F, FontStyle.Bold);
            _btnBackup.Location = new Point(4, 4);
            _btnBackup.Click += OnBackup;
            _runStatus = new Label
            {
                AutoSize = false,
                Location = new Point(164, 10),
                Size = new Size(360, 24),
                Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right,
                ForeColor = Theme.Muted,
                BackColor = Theme.Card,
                Text = ""
            };
            bakGo.Controls.Add(_btnBackup);
            bakGo.Controls.Add(_runStatus);
            bakBody.Controls.Add(bakHead, 0, 0);
            bakBody.Controls.Add(_picked, 0, 1);
            bakBody.Controls.Add(_spaceHint, 0, 2);
            bakBody.Controls.Add(_keepOld, 0, 3);
            bakBody.Controls.Add(_bar, 0, 4);
            bakBody.Controls.Add(_progHint, 0, 5);
            bakBody.Controls.Add(bakGo, 0, 6);
            bakCard.Controls.Add(bakBody);

            var logCard = MakeCard();
            var logBody = MakeBody();
            logBody.RowCount = 2;
            logBody.RowStyles.Add(new RowStyle(SizeType.Absolute, 36));
            logBody.RowStyles.Add(new RowStyle(SizeType.Percent, 100F));
            logBody.Controls.Add(MakeHead("03", "运行控制台", "实时输出", null), 0, 0);
            _log = new TextBox
            {
                Multiline = true,
                ReadOnly = true,
                ScrollBars = ScrollBars.Vertical,
                BorderStyle = BorderStyle.None,
                Dock = DockStyle.Fill,
                BackColor = Theme.LogBg,
                ForeColor = Theme.LogText,
                Font = Theme.Mono,
                Text = "等待操作…"
            };
            logBody.Controls.Add(_log, 0, 1);
            logCard.Controls.Add(logBody);

            var left = new TableLayoutPanel();
            left.Dock = DockStyle.Fill;
            left.BackColor = Color.Transparent;
            left.ColumnCount = 1;
            left.RowCount = 2;
            left.RowStyles.Add(new RowStyle(SizeType.Percent, 54F));
            left.RowStyles.Add(new RowStyle(SizeType.Percent, 46F));
            left.Controls.Add(connCard, 0, 0);
            left.Controls.Add(bakCard, 0, 1);
            grid.Controls.Add(left, 0, 0);
            grid.Controls.Add(logCard, 1, 0);

            Controls.Add(grid);
            Controls.Add(header);

            _poll = new System.Windows.Forms.Timer();
            _poll.Interval = 1000;
            _poll.Tick += OnPoll;
            Load += delegate { LoadConfigToUi(); };
            FormClosing += OnClosing;
        }

        static string PrepareWorkDir(string exeDir)
        {
            string serverScript = Path.Combine(exeDir, "backup-db.ps1");
            string marker = Path.Combine(exeDir, Program.MarkerName);
            bool original = File.Exists(serverScript) && !File.Exists(marker);
            if (!original)
            {
                ExtractPackedFiles(exeDir);
                File.WriteAllText(marker, "packed", Encoding.ASCII);
            }
            return exeDir;
        }

        static void ExtractPackedFiles(string dir)
        {
            Assembly asm = Assembly.GetExecutingAssembly();
            foreach (string name in PackedFiles)
            {
                Stream src = asm.GetManifestResourceStream(name);
                if (src == null)
                {
                    continue;
                }
                using (src)
                using (FileStream fs = File.Create(Path.Combine(dir, name)))
                {
                    src.CopyTo(fs);
                }
            }
        }

        static CardPanel MakeCard()
        {
            return new CardPanel { Dock = DockStyle.Fill };
        }

        static TableLayoutPanel MakeBody()
        {
            var body = new TableLayoutPanel();
            body.Dock = DockStyle.Fill;
            body.ColumnCount = 1;
            body.BackColor = Theme.Card;
            body.Padding = new Padding(10, 6, 12, 8);
            body.ColumnStyles.Add(new ColumnStyle(SizeType.Percent, 100F));
            return body;
        }

        /// <summary>
        /// 卡片标题行：序号 + 标题 + 说明，右侧可放按钮。
        /// </summary>
        static Panel MakeHead(string step, string title, string hint, Control right)
        {
            var head = new Panel { Dock = DockStyle.Fill, BackColor = Theme.Card };
            var st = MakeStep(step);
            st.Location = new Point(2, 8);
            var t = SectionLabel(title, 38, 8);
            head.Controls.Add(st);
            head.Controls.Add(t);
            if (!string.IsNullOrEmpty(hint))
            {
                int titleW = TextRenderer.MeasureText(title, Theme.Section).Width;
                var h = new Label
                {
                    Text = hint,
                    Font = Theme.Caption,
                    ForeColor = Theme.Muted,
                    AutoSize = true,
                    Location = new Point(46 + titleW, 12),
                    BackColor = Theme.Card
                };
                head.Controls.Add(h);
            }
            if (right != null)
            {
                right.Anchor = AnchorStyles.Top | AnchorStyles.Right;
                head.Controls.Add(right);
                EventHandler place = delegate
                {
                    right.Location = new Point(Math.Max(120, head.Width - right.Width - 4), 4);
                };
                head.Resize += place;
                place(head, EventArgs.Empty);
            }
            return head;
        }

        /// <summary>
        /// 标签在上、输入在下，两列等宽，避免右侧字段被挤没。
        /// </summary>
        static Panel MakeField(string caption, Control input)
        {
            var box = new Panel();
            box.Dock = DockStyle.Fill;
            box.BackColor = Theme.Card;
            box.Margin = new Padding(4, 2, 8, 2);
            box.Padding = new Padding(0, 0, 4, 2);
            var lb = new Label();
            lb.Text = caption;
            lb.ForeColor = Theme.Muted;
            lb.Font = Theme.Caption;
            lb.Dock = DockStyle.Top;
            lb.Height = 20;
            lb.BackColor = Theme.Card;
            lb.TextAlign = ContentAlignment.BottomLeft;
            input.Dock = DockStyle.Fill;
            box.Controls.Add(input);
            box.Controls.Add(lb);
            return box;
        }

        static Label MakeStep(string no)
        {
            return new Label
            {
                Text = no,
                Font = new Font("Segoe UI", 8.5F, FontStyle.Bold),
                ForeColor = Theme.Ink,
                BackColor = Theme.Cyan,
                Size = new Size(28, 22),
                Location = new Point(0, 6),
                TextAlign = ContentAlignment.MiddleCenter
            };
        }

        static void PaintMesh(object sender, PaintEventArgs e)
        {
            var c = sender as Control;
            if (c == null)
            {
                return;
            }
            using (var p = new Pen(Theme.Mesh))
            {
                for (int x = 0; x < c.Width; x += 42)
                {
                    e.Graphics.DrawLine(p, x, 0, x, c.Height);
                }
                for (int y = 0; y < c.Height; y += 42)
                {
                    e.Graphics.DrawLine(p, 0, y, c.Width, y);
                }
            }
        }

        static Label SectionLabel(string text, int x, int y)
        {
            return new Label
            {
                Text = text,
                Font = Theme.Section,
                ForeColor = Theme.Text,
                AutoSize = true,
                Location = new Point(x, y),
                BackColor = Theme.Card
            };
        }

        static Label FieldLabel(string text)
        {
            return new Label
            {
                Text = text,
                ForeColor = Theme.Muted,
                Dock = DockStyle.Fill,
                TextAlign = ContentAlignment.MiddleLeft,
                BackColor = Theme.Card
            };
        }

        static TextBox MakeInput()
        {
            return new TextBox
            {
                Dock = DockStyle.Fill,
                BorderStyle = BorderStyle.FixedSingle,
                BackColor = Theme.Input,
                ForeColor = Theme.Text,
                Margin = new Padding(0)
            };
        }

        static Button MakeButton(string text, bool primary)
        {
            var b = new Button();
            b.Text = text;
            b.Width = 110;
            b.Height = 32;
            b.FlatStyle = FlatStyle.Flat;
            b.Cursor = Cursors.Hand;
            if (primary)
            {
                b.FlatAppearance.BorderSize = 0;
                b.BackColor = Theme.CyanDeep;
                b.ForeColor = Theme.Ink;
                b.MouseEnter += delegate { if (b.Enabled) { b.BackColor = Theme.Cyan; } };
                b.MouseLeave += delegate { b.BackColor = Theme.CyanDeep; };
            }
            else
            {
                b.FlatAppearance.BorderSize = 1;
                b.FlatAppearance.BorderColor = Color.FromArgb(70, 255, 255, 255);
                b.BackColor = Color.FromArgb(18, 22, 32);
                b.ForeColor = Theme.Text;
                b.MouseEnter += delegate { if (b.Enabled) { b.BackColor = Color.FromArgb(28, 36, 52); } };
                b.MouseLeave += delegate { b.BackColor = Color.FromArgb(18, 22, 32); };
            }
            return b;
        }

        static Button MakeGoldButton(string text)
        {
            var b = new Button();
            b.Text = text;
            b.Width = 110;
            b.Height = 32;
            b.FlatStyle = FlatStyle.Flat;
            b.FlatAppearance.BorderSize = 0;
            b.BackColor = Theme.Cyan;
            b.ForeColor = Theme.Ink;
            b.Cursor = Cursors.Hand;
            b.MouseEnter += delegate { if (b.Enabled) { b.BackColor = Theme.CyanDeep; } };
            b.MouseLeave += delegate { b.BackColor = Theme.Cyan; };
            return b;
        }

        DbConfig ReadUiConfig()
        {
            var cfg = new DbConfig();
            cfg.Host = (_host.Text ?? "").Trim();
            int port;
            if (!int.TryParse((_port.Text ?? "").Trim(), out port))
            {
                port = 3306;
            }
            cfg.Port = port;
            cfg.Database = (_database.Text ?? "").Trim();
            cfg.User = (_user.Text ?? "").Trim();
            cfg.Password = _password.Text ?? "";
            return cfg;
        }

        void LoadConfigToUi()
        {
            DbConfig cfg = DbConfigStore.Load(_workDir);
            _host.Text = cfg.Host;
            _port.Text = cfg.Port.ToString();
            _database.Text = cfg.Database;
            _user.Text = cfg.User;
            _password.Text = cfg.Password;
        }

        void OnTest(object sender, EventArgs e)
        {
            _btnTest.Enabled = false;
            SetCfg("正在测试连接，请稍候…", Theme.Warn);
            DbConfig cfg = ReadUiConfig();
            ThreadPool.QueueUserWorkItem(delegate
            {
                try
                {
                    string msg = MysqlUtil.TestConnection(cfg);
                    BeginInvoke(new Action(delegate
                    {
                        SetCfg(msg, Theme.Ok);
                        _btnTest.Enabled = true;
                    }));
                }
                catch (Exception ex)
                {
                    BeginInvoke(new Action(delegate
                    {
                        SetCfg(ex.Message, Theme.Bad);
                        _btnTest.Enabled = true;
                    }));
                }
            });
        }

        void OnSave(object sender, EventArgs e)
        {
            try
            {
                DbConfig cfg = ReadUiConfig();
                DbConfigStore.Save(_workDir, cfg);
                SetCfg("已保存 MySQL 配置", Theme.Ok);
            }
            catch (Exception ex)
            {
                SetCfg(ex.Message, Theme.Bad);
            }
        }

        void OnBrowse(object sender, EventArgs e)
        {
            using (var dlg = new FolderBrowserDialog())
            {
                dlg.Description = "选择备份文件保存位置（可选手动插入的 U 盘或移动硬盘）";
                dlg.ShowNewFolderButton = true;
                dlg.RootFolder = Environment.SpecialFolder.MyComputer;
                if (!string.IsNullOrEmpty(_selectedPath) && Directory.Exists(_selectedPath))
                {
                    dlg.SelectedPath = _selectedPath;
                }
                if (dlg.ShowDialog(this) != DialogResult.OK)
                {
                    return;
                }
                try
                {
                    _selectedPath = GetSafePath(dlg.SelectedPath);
                    _picked.Text = "  " + _selectedPath;
                    _picked.ForeColor = Theme.Text;
                    long free = GetFreeBytes(_selectedPath);
                    if (free > 0)
                    {
                        _spaceHint.Text = "该磁盘剩余 " + Gb(free) + " GB。";
                    }
                    SetRun("已选择保存位置", Theme.Ok);
                }
                catch (Exception ex)
                {
                    SetRun(ex.Message, Theme.Bad);
                }
            }
        }

        void OnBackup(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(_selectedPath))
            {
                SetRun("请先点「浏览文件夹」选择保存位置", Theme.Bad);
                return;
            }
            string script = Path.Combine(_workDir, "backup-db.ps1");
            if (!File.Exists(script))
            {
                SetRun("找不到 backup-db.ps1", Theme.Bad);
                return;
            }
            try
            {
                DbConfig cfg = ReadUiConfig();
                DbConfigStore.Save(_workDir, cfg);
                string dir = GetSafePath(_selectedPath);
                long free = GetFreeBytes(dir);
                _dbBytes = MysqlUtil.GetDbSizeBytes(cfg);
                if (_dbBytes > 0 && free > 0 && free < (long)(_dbBytes * 1.2))
                {
                    throw new Exception("目标盘剩余空间不足：约需 " + Gb((long)(_dbBytes * 1.2)) +
                        " GB，当前剩余 " + Gb(free) + " GB。请换更大的 U 盘/硬盘。");
                }
                if (!Directory.Exists(dir))
                {
                    Directory.CreateDirectory(dir);
                }

                int keep = _keepOld.Checked ? 7 : 0;
                string powershell = Path.Combine(Environment.SystemDirectory, @"WindowsPowerShell\v1.0\powershell.exe");
                if (!File.Exists(powershell))
                {
                    powershell = "powershell.exe";
                }
                _outFile = Path.Combine(Path.GetTempPath(), "mes_backup_ui_" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".log");
                string errFile = _outFile + ".err";
                TryDelete(_outFile);
                TryDelete(errFile);

                var psi = new ProcessStartInfo();
                psi.FileName = powershell;
                psi.Arguments = "-NoProfile -STA -ExecutionPolicy Bypass -File \"" + script +
                    "\" -BackupDir \"" + dir + "\" -KeepDaysParam " + keep;
                psi.WorkingDirectory = _workDir;
                psi.UseShellExecute = false;
                psi.CreateNoWindow = true;
                psi.RedirectStandardOutput = true;
                psi.RedirectStandardError = true;
                psi.StandardOutputEncoding = Encoding.UTF8;
                psi.StandardErrorEncoding = Encoding.UTF8;

                _backupProc = new Process();
                _backupProc.StartInfo = psi;
                _backupProc.EnableRaisingEvents = true;
                _backupProc.OutputDataReceived += OnBackupOutput;
                _backupProc.ErrorDataReceived += OnBackupOutput;
                if (!_backupProc.Start())
                {
                    throw new Exception("无法启动备份进程");
                }
                _backupProc.BeginOutputReadLine();
                _backupProc.BeginErrorReadLine();

                _running = true;
                _startedAt = DateTime.Now;
                _selectedPath = dir;
                _btnBackup.Enabled = false;
                _bar.Style = ProgressBarStyle.Marquee;
                _bar.Value = 0;
                SetLog(new[] { "开始备份到: " + dir });
                if (_dbBytes > 0)
                {
                    AppendLog("库数据约 " + Gb(_dbBytes) + " GB，采用边导出边压缩，请耐心等待，勿拔盘");
                }
                SetRun("正在备份，数据量大时可能需要较长时间...", Theme.Warn);
                _poll.Start();
            }
            catch (Exception ex)
            {
                SetRun(ex.Message, Theme.Bad);
                _btnBackup.Enabled = true;
            }
        }

        void OnBackupOutput(object sender, DataReceivedEventArgs e)
        {
            if (string.IsNullOrEmpty(e.Data))
            {
                return;
            }
            BeginInvoke(new Action(delegate { AppendLog(e.Data); }));
        }

        void OnPoll(object sender, EventArgs e)
        {
            if (!_running)
            {
                return;
            }
            long written;
            string fileName;
            GetWrittenBackup(_selectedPath, out written, out fileName);
            if (_dbBytes > 0 && written > 1024)
            {
                _bar.Style = ProgressBarStyle.Continuous;
                int pct = (int)Math.Max(2, Math.Min(99, written * 100 / _dbBytes));
                _bar.Value = pct;
            }
            _progHint.Text = "已写入 " + Mb(written) + " MB" + (string.IsNullOrEmpty(fileName) ? "" : "（" + fileName + "）") + "，请勿拔盘";

            Process p = _backupProc;
            bool exited = false;
            int code = -1;
            if (p == null)
            {
                exited = true;
            }
            else
            {
                try
                {
                    p.Refresh();
                    exited = p.HasExited;
                    if (exited)
                    {
                        try { p.WaitForExit(500); } catch { }
                        try { code = p.ExitCode; } catch { code = -1; }
                    }
                }
                catch
                {
                    exited = true;
                }
            }
            if (!exited)
            {
                return;
            }

            _poll.Stop();
            _running = false;
            _btnBackup.Enabled = true;
            _bar.Style = ProgressBarStyle.Continuous;
            bool fileOk = TestBackupFileOk(_selectedPath, _startedAt);
            bool success = (code == 0) || fileOk;
            if (success)
            {
                _bar.Value = 100;
                GetWrittenBackup(_selectedPath, out written, out fileName);
                _progHint.Text = "完成，文件约 " + Mb(written) + " MB：" + (fileName ?? "");
                AppendLog("备份完成");
                SetRun("备份完成", Theme.Ok);
            }
            else
            {
                string codeText = code < 0 ? "未知" : code.ToString();
                string err = "备份失败，退出码 " + codeText;
                AppendLog(err);
                SetRun(err, Theme.Bad);
            }
            _backupProc = null;
        }

        void OnClosing(object sender, FormClosingEventArgs e)
        {
            if (_running)
            {
                DialogResult r = MessageBox.Show(this,
                    "备份正在进行，关闭窗口会中断备份。确定退出吗？",
                    "MES 数据库备份",
                    MessageBoxButtons.YesNo,
                    MessageBoxIcon.Warning);
                if (r != DialogResult.Yes)
                {
                    e.Cancel = true;
                    return;
                }
            }
            _poll.Stop();
            Process p = _backupProc;
            _backupProc = null;
            if (p != null)
            {
                try
                {
                    if (!p.HasExited)
                    {
                        KillProcessTree(p.Id);
                    }
                }
                catch { }
                try { p.Dispose(); } catch { }
            }
        }

        static void GetWrittenBackup(string dir, out long bytes, out string name)
        {
            bytes = 0;
            name = "";
            if (string.IsNullOrEmpty(dir) || !Directory.Exists(dir))
            {
                return;
            }
            FileInfo pick = null;
            try
            {
                var files = new List<FileInfo>(new DirectoryInfo(dir).GetFiles("mes_cloud_*.sql.gz*"));
                files.Sort(delegate(FileInfo a, FileInfo b) { return b.LastWriteTime.CompareTo(a.LastWriteTime); });
                foreach (FileInfo f in files)
                {
                    if (f.Name.IndexOf(".tmp", StringComparison.OrdinalIgnoreCase) < 0)
                    {
                        pick = f;
                        break;
                    }
                }
                if (pick == null && files.Count > 0)
                {
                    pick = files[0];
                }
            }
            catch { }
            if (pick != null)
            {
                name = pick.Name;
                bytes = pick.Length;
            }
        }

        static bool TestBackupFileOk(string dir, DateTime started)
        {
            if (string.IsNullOrEmpty(dir) || !Directory.Exists(dir))
            {
                return false;
            }
            FileInfo gz = null;
            try
            {
                foreach (FileInfo f in new DirectoryInfo(dir).GetFiles("mes_cloud_*.sql.gz"))
                {
                    if (gz == null || f.LastWriteTime > gz.LastWriteTime)
                    {
                        gz = f;
                    }
                }
            }
            catch { return false; }
            if (gz == null || gz.Length <= 100)
            {
                return false;
            }
            if (gz.LastWriteTime < started.AddMinutes(-2))
            {
                return false;
            }
            return true;
        }

        static string GetSafePath(string path)
        {
            if (string.IsNullOrWhiteSpace(path))
            {
                throw new Exception("请先选择保存位置");
            }
            string p = path.Trim().Trim('"');
            if (!Regex.IsMatch(p, @"^[A-Za-z]:\\"))
            {
                throw new Exception("只允许本机磁盘路径");
            }
            string full = Path.GetFullPath(p);
            if (Regex.IsMatch(full, @"^[A-Za-z]:\\?$"))
            {
                return char.ToUpperInvariant(full[0]) + @":\";
            }
            return full.TrimEnd('\\');
        }

        static long GetFreeBytes(string path)
        {
            try
            {
                string full = GetSafePath(path);
                string root = Path.GetPathRoot(full);
                var di = new DriveInfo(root);
                if (di.IsReady)
                {
                    return di.AvailableFreeSpace;
                }
            }
            catch { }
            return 0;
        }

        static void KillProcessTree(int pid)
        {
            try
            {
                var psi = new ProcessStartInfo();
                psi.FileName = "taskkill";
                psi.Arguments = "/PID " + pid + " /T /F";
                psi.CreateNoWindow = true;
                psi.UseShellExecute = false;
                using (Process k = Process.Start(psi))
                {
                    if (k != null)
                    {
                        k.WaitForExit(5000);
                    }
                }
            }
            catch { }
        }

        static void TryDelete(string path)
        {
            try { if (File.Exists(path)) { File.Delete(path); } } catch { }
        }

        static string Gb(long n)
        {
            return (n / 1073741824.0).ToString("0.00");
        }

        static string Mb(long n)
        {
            return (n / 1048576.0).ToString("0.0");
        }

        void SetCfg(string text, Color color)
        {
            _cfgStatus.Text = text ?? "";
            _cfgStatus.ForeColor = color;
        }

        void SetRun(string text, Color color)
        {
            _runStatus.Text = text ?? "";
            _runStatus.ForeColor = color;
        }

        void SetLog(string[] lines)
        {
            _log.Text = (lines != null && lines.Length > 0) ? string.Join(Environment.NewLine, lines) : "等待操作…";
            _log.SelectionStart = _log.TextLength;
            _log.ScrollToCaret();
        }

        void AppendLog(string line)
        {
            if (_log.Text == "等待操作…" || _log.Text == "等待操作...")
            {
                _log.Text = "";
            }
            if (_log.TextLength > 60000)
            {
                _log.Text = _log.Text.Substring(_log.TextLength - 40000);
            }
            _log.AppendText(line + Environment.NewLine);
        }
    }
}