using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TfsExcelImporter
{
    public class MainForm : Form
    {
        // ------------------------------------------------------------- 控件
        private readonly TextBox _txtUrl = new TextBox();
        private readonly TextBox _txtProject = new TextBox();
        private readonly TextBox _txtType = new TextBox();
        private readonly ComboBox _cmbAuth = new ComboBox();
        private readonly TextBox _txtUser = new TextBox();
        private readonly TextBox _txtPwd = new TextBox { UseSystemPasswordChar = true };
        private readonly TextBox _txtDomain = new TextBox();
        private readonly CheckBox _chkProxy = new CheckBox();

        private readonly ComboBox _cmbIteration = new ComboBox();
        private readonly Button _btnLoadIterations = new Button();
        private readonly TextBox _txtExcel = new TextBox();
        private readonly Button _btnBrowse = new Button();
        private readonly Button _btnTemplate = new Button();
        private readonly CheckBox _chkSkip = new CheckBox();
        private readonly CheckBox _chkBypass = new CheckBox();
        private readonly TextBox _txtParentPbi = new TextBox();

        private readonly DataGridView _grid = new DataGridView();
        private readonly Button _btnPreview = new Button();
        private readonly Button _btnImport = new Button();
        private readonly Button _btnFixArea = new Button();
        private readonly Button _btnLinkParent = new Button();
        private readonly TextBox _txtLog = new TextBox();
        private readonly Label _lblStatus = new Label();

        private AppConfig _cfg;
        private List<WorkItemRow> _rows = new List<WorkItemRow>();

        public MainForm()
        {
            _cfg = AppConfig.Load();
            BuildUi();
            LoadConfigToUi();
        }

        // ------------------------------------------------------------- UI 构建
        private void BuildUi()
        {
            Text = "TFS 2013 工作项 Excel 导入工具";
            ClientSize = new Size(1060, 720);
            MinimumSize = new Size(960, 640);
            StartPosition = FormStartPosition.CenterScreen;
            Font = new Font("Microsoft YaHei UI", 9F);

            int y = 12, left = 12, lblW = 84;

            // --- 服务器配置区 ---
            var grpServer = new GroupBox
            {
                Text = "TFS 连接",
                Location = new Point(left, y),
                Size = new Size(1036, 120),
                Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right
            };
            Controls.Add(grpServer);

            AddLabel(grpServer, "服务器URL:", 12, 24, lblW);
            _txtUrl.Location = new Point(100, 22); _txtUrl.Size = new Size(460, 27);
            _txtUrl.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right;
            grpServer.Controls.Add(_txtUrl);

            _chkProxy.Text = "使用系统代理";
            _chkProxy.Location = new Point(564, 24); _chkProxy.Size = new Size(110, 24);
            _chkProxy.Anchor = AnchorStyles.Top | AnchorStyles.Right;
            _chkProxy.Checked = false; // 内网 TFS 默认直连
            grpServer.Controls.Add(_chkProxy);

            AddLabel(grpServer, "团队项目:", 680, 24, lblW);
            _txtProject.Location = new Point(768, 22); _txtProject.Size = new Size(150, 27);
            _txtProject.Anchor = AnchorStyles.Top | AnchorStyles.Right;
            grpServer.Controls.Add(_txtProject);

            AddLabel(grpServer, "工作项类型:", 12, 58, lblW);
            _txtType.Location = new Point(100, 56); _txtType.Size = new Size(220, 27);
            grpServer.Controls.Add(_txtType);

            AddLabel(grpServer, "认证方式:", 340, 58, lblW);
            _cmbAuth.Location = new Point(428, 56); _cmbAuth.Size = new Size(110, 27);
            _cmbAuth.DropDownStyle = ComboBoxStyle.DropDownList;
            _cmbAuth.Items.AddRange(new object[] { "ntlm", "basic", "default" });
            _cmbAuth.SelectedIndexChanged += (s, e) => UpdateAuthUi();
            grpServer.Controls.Add(_cmbAuth);

            AddLabel(grpServer, "用户:", 556, 58, 44);
            _txtUser.Location = new Point(604, 56); _txtUser.Size = new Size(110, 27);
            grpServer.Controls.Add(_txtUser);

            AddLabel(grpServer, "密码:", 726, 58, 44);
            _txtPwd.Location = new Point(774, 56); _txtPwd.Size = new Size(110, 27);
            grpServer.Controls.Add(_txtPwd);

            AddLabel(grpServer, "域:", 896, 58, 28);
            _txtDomain.Location = new Point(928, 56); _txtDomain.Size = new Size(94, 27);
            _txtDomain.Anchor = AnchorStyles.Top | AnchorStyles.Right;
            grpServer.Controls.Add(_txtDomain);

            y += 128;

            // --- 导入选区 ---
            var grpImport = new GroupBox
            {
                Text = "导入选区",
                Location = new Point(left, y),
                Size = new Size(1036, 120),
                Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right
            };
            Controls.Add(grpImport);

            AddLabel(grpImport, "目标Iteration:", 12, 26, 96);
            _cmbIteration.Location = new Point(112, 23); _cmbIteration.Size = new Size(560, 27);
            _cmbIteration.DropDownStyle = ComboBoxStyle.DropDown; // 允许手填
            _cmbIteration.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right;
            grpImport.Controls.Add(_cmbIteration);

            _btnLoadIterations.Text = "加载迭代列表";
            _btnLoadIterations.Location = new Point(682, 22); _btnLoadIterations.Size = new Size(110, 29);
            _btnLoadIterations.Anchor = AnchorStyles.Top | AnchorStyles.Right;
            _btnLoadIterations.Click += async (s, e) => await LoadIterationsAsync();
            grpImport.Controls.Add(_btnLoadIterations);

            AddLabel(grpImport, "Excel 文件:", 12, 62, 96);
            _txtExcel.Location = new Point(112, 59); _txtExcel.Size = new Size(560, 27);
            _txtExcel.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right;
            grpImport.Controls.Add(_txtExcel);

            _btnBrowse.Text = "浏览...";
            _btnBrowse.Location = new Point(682, 58); _btnBrowse.Size = new Size(70, 29);
            _btnBrowse.Anchor = AnchorStyles.Top | AnchorStyles.Right;
            _btnBrowse.Click += (s, e) => BrowseExcel();
            grpImport.Controls.Add(_btnBrowse);

            _btnTemplate.Text = "生成Excel模板";
            _btnTemplate.Location = new Point(760, 58); _btnTemplate.Size = new Size(110, 29);
            _btnTemplate.Anchor = AnchorStyles.Top | AnchorStyles.Right;
            _btnTemplate.Click += (s, e) => GenerateTemplate();
            grpImport.Controls.Add(_btnTemplate);

            _chkSkip.Text = "跳过已存在标题";
            _chkSkip.Location = new Point(886, 26); _chkSkip.Size = new Size(130, 24);
            _chkSkip.Anchor = AnchorStyles.Top | AnchorStyles.Right;
            grpImport.Controls.Add(_chkSkip);

            _chkBypass.Text = "bypassRules(可写系统日期)";
            _chkBypass.Location = new Point(886, 60); _chkBypass.Size = new Size(150, 24);
            _chkBypass.Anchor = AnchorStyles.Top | AnchorStyles.Right;
            grpImport.Controls.Add(_chkBypass);

            // 父 PBI：全部 Task 默认挂接的 Product Backlog Item（Excel 每行 PBI Id 列可覆盖）
            AddLabel(grpImport, "父PBI Id:", 12, 92, 96);
            _txtParentPbi.Location = new Point(112, 89); _txtParentPbi.Size = new Size(200, 27);
            grpImport.Controls.Add(_txtParentPbi);
            var lblPbiHint = new Label
            {
                Text = "Task 将挂接为该 Product Backlog Item 的子项；Excel 加 PBI Id 列可逐行指定不同父项",
                Location = new Point(320, 92), Size = new Size(560, 22),
                TextAlign = ContentAlignment.MiddleLeft,
                ForeColor = SystemColors.GrayText
            };
            grpImport.Controls.Add(lblPbiHint);

            y += 128;

            // --- 预览表格 ---
            _grid.Location = new Point(left, y);
            _grid.Size = new Size(1036, 300);
            _grid.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Bottom;
            _grid.ReadOnly = true;
            _grid.AllowUserToAddRows = false;
            _grid.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells;
            _grid.RowHeadersVisible = false;
            _grid.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
            Controls.Add(_grid);
            y += 308;

            // --- 操作按钮 ---
            _btnPreview.Text = "预览数据";
            _btnPreview.Location = new Point(left, y); _btnPreview.Size = new Size(110, 32);
            _btnPreview.Anchor = AnchorStyles.Bottom | AnchorStyles.Left;
            _btnPreview.Click += (s, e) => PreviewData();
            Controls.Add(_btnPreview);

            _btnImport.Text = "开始导入 TFS";
            _btnImport.Location = new Point(left + 122, y); _btnImport.Size = new Size(130, 32);
            _btnImport.Anchor = AnchorStyles.Bottom | AnchorStyles.Left;
            _btnImport.BackColor = Color.FromArgb(0, 120, 215);
            _btnImport.ForeColor = Color.White;
            _btnImport.Click += async (s, e) => await ImportAsync();
            Controls.Add(_btnImport);

            _btnFixArea.Text = "按迭代修Area";
            _btnFixArea.Location = new Point(left + 264, y); _btnFixArea.Size = new Size(130, 32);
            _btnFixArea.Anchor = AnchorStyles.Bottom | AnchorStyles.Left;
            _btnFixArea.Click += async (s, e) => await FixAreaAsync();
            Controls.Add(_btnFixArea);

            _btnLinkParent.Text = "补挂父项";
            _btnLinkParent.Location = new Point(left + 406, y); _btnLinkParent.Size = new Size(130, 32);
            _btnLinkParent.Anchor = AnchorStyles.Bottom | AnchorStyles.Left;
            _btnLinkParent.Click += async (s, e) => await LinkParentAsync();
            Controls.Add(_btnLinkParent);

            _lblStatus.Text = "就绪";
            _lblStatus.Location = new Point(left + 548, y + 6); _lblStatus.Size = new Size(400, 22);
            _lblStatus.Anchor = AnchorStyles.Bottom | AnchorStyles.Left;
            Controls.Add(_lblStatus);
            y += 40;

            // --- 日志 ---
            _txtLog.Location = new Point(left, y);
            _txtLog.Size = new Size(1036, 120);
            _txtLog.Anchor = AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right;
            _txtLog.Multiline = true;
            _txtLog.ScrollBars = ScrollBars.Vertical;
            _txtLog.ReadOnly = true;
            Controls.Add(_txtLog);
        }

        private static void AddLabel(Control parent, string text, int x, int y, int w)
        {
            var lbl = new Label { Text = text, Location = new Point(x, y), Size = new Size(w, 22), TextAlign = ContentAlignment.MiddleLeft };
            parent.Controls.Add(lbl);
        }

        private void UpdateAuthUi()
        {
            bool needCreds = _cmbAuth.SelectedItem != null && _cmbAuth.SelectedItem.ToString() != "default";
            _txtUser.Enabled = needCreds;
            _txtPwd.Enabled = needCreds;
            _txtDomain.Enabled = needCreds;
        }

        // ------------------------------------------------------------- 配置互转
        private void LoadConfigToUi()
        {
            _txtUrl.Text = _cfg.TfsUrl;
            _txtProject.Text = _cfg.Project;
            _txtType.Text = _cfg.WorkItemType;
            _cmbAuth.SelectedItem = _cfg.AuthMode;
            if (_cmbAuth.SelectedItem == null) _cmbAuth.SelectedItem = "ntlm";
            _txtUser.Text = _cfg.Username;
            _txtPwd.Text = _cfg.Password;
            _txtDomain.Text = _cfg.Domain;
            _chkProxy.Checked = _cfg.UseSystemProxy;
            _cmbIteration.Text = _cfg.IterationPath;
            _txtExcel.Text = _cfg.LastExcelPath;
            _chkSkip.Checked = _cfg.SkipExistingTitles;
            _chkBypass.Checked = _cfg.BypassRules;
            _txtParentPbi.Text = _cfg.ParentPbiId;
            UpdateAuthUi();
        }

        private void SaveUiToConfig()
        {
            _cfg.TfsUrl = _txtUrl.Text.Trim();
            _cfg.Project = _txtProject.Text.Trim();
            _cfg.WorkItemType = _txtType.Text.Trim();
            _cfg.AuthMode = _cmbAuth.SelectedItem != null ? _cmbAuth.SelectedItem.ToString() : "ntlm";
            _cfg.Username = _txtUser.Text.Trim();
            _cfg.Password = _txtPwd.Text;
            _cfg.Domain = _txtDomain.Text.Trim();
            _cfg.UseSystemProxy = _chkProxy.Checked;
            _cfg.IterationPath = _cmbIteration.Text.Trim();
            _cfg.LastExcelPath = _txtExcel.Text.Trim();
            _cfg.SkipExistingTitles = _chkSkip.Checked;
            _cfg.BypassRules = _chkBypass.Checked;
            _cfg.ParentPbiId = _txtParentPbi.Text.Trim();
            _cfg.Save();
        }

        // ------------------------------------------------------------- 日志
        private void Log(string msg)
        {
            if (InvokeRequired) { BeginInvoke(new Action(() => Log(msg))); return; }
            _txtLog.AppendText($"[{DateTime.Now:HH:mm:ss}] {msg}{Environment.NewLine}");
        }

        // ------------------------------------------------------------- 迭代加载
        private async Task LoadIterationsAsync()
        {
            SaveUiToConfig();
            _btnLoadIterations.Enabled = false;
            try
            {
                using (var client = new TfsClient(_cfg))
                {
                    Log("测试连接...");
                    Log(await client.TestConnectionAsync());
                    // 提前探测导入所需字段接口，避免导入时才发现路由缺失
                    try
                    {
                        var fm = await client.GetFieldMapAsync();
                        Log($"字段接口可用（字段 {fm.Count} 个）");
                    }
                    catch (Exception ex)
                    {
                        Log("⚠ 字段接口(_apis/wit/fields)不可用，导入可能受影响: " + ex.Message.Split('\n')[0]);
                    }
                    var paths = await client.GetIterationPathsAsync(_cfg.Project, Log);
                    _cmbIteration.Items.Clear();
                    foreach (var p in paths) _cmbIteration.Items.Add(p);
                    if (_cmbIteration.Items.Count > 0 && string.IsNullOrWhiteSpace(_cmbIteration.Text))
                        _cmbIteration.SelectedIndex = 0;
                    // 优先选中配置中的迭代
                    for (int i = 0; i < _cmbIteration.Items.Count; i++)
                    {
                        if (string.Equals(_cmbIteration.Items[i].ToString(), _cfg.IterationPath,
                                StringComparison.OrdinalIgnoreCase))
                        {
                            _cmbIteration.SelectedIndex = i;
                            break;
                        }
                    }
                    Log($"已加载 {_cmbIteration.Items.Count} 个迭代路径");
                }
            }
            catch (Exception ex)
            {
                Log("加载迭代失败: " + ex.Message);
                MessageBox.Show(this, "加载迭代失败:\n" + ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                _btnLoadIterations.Enabled = true;
            }
        }

        // ------------------------------------------------------------- Excel
        private void BrowseExcel()
        {
            using (var dlg = new OpenFileDialog())
            {
                dlg.Filter = "Excel 文件 (*.xlsx;*.xlsm)|*.xlsx;*.xlsm|所有文件 (*.*)|*.*";
                dlg.Title = "选择要导入的 Excel 文件";
                if (!string.IsNullOrEmpty(_txtExcel.Text))
                {
                    try { dlg.InitialDirectory = Path.GetDirectoryName(_txtExcel.Text); } catch { }
                }
                if (dlg.ShowDialog(this) != DialogResult.OK) return;
                _txtExcel.Text = dlg.FileName;
                SaveUiToConfig();
                PreviewData();
            }
        }

        private void GenerateTemplate()
        {
            using (var dlg = new SaveFileDialog())
            {
                dlg.Filter = "Excel 文件 (*.xlsx)|*.xlsx";
                dlg.FileName = "TFS导入模板.xlsx";
                dlg.Title = "保存 Excel 模板";
                if (dlg.ShowDialog(this) != DialogResult.OK) return;
                try
                {
                    ExcelService.GenerateTemplate(dlg.FileName);
                    Log("模板已生成: " + dlg.FileName);
                    MessageBox.Show(this, "模板已生成:\n" + dlg.FileName, "完成",
                        MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                catch (Exception ex)
                {
                    Log("生成模板失败: " + ex.Message);
                    MessageBox.Show(this, "生成模板失败:\n" + ex.Message, "错误",
                        MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        private void PreviewData()
        {
            var path = _txtExcel.Text.Trim();
            if (string.IsNullOrEmpty(path) || !File.Exists(path))
            {
                MessageBox.Show(this, "请先选择有效的 Excel 文件", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            try
            {
                _rows = ExcelService.ReadRows(path);
                _grid.DataSource = null;
                _grid.DataSource = _rows.Select((r, i) => new
                {
                    行号 = i + 1,
                    r.Title,
                    r.State,
                    指派 = r.AssignedTo,
                    财务项目 = r.FinancialProject,
                    r.Completed,
                    LogDate = r.LogDate,
                    Created = r.CreatedDate,
                    Closed = r.ClosedDate,
                    r.Notes
                }).ToList();
                _lblStatus.Text = $"已读取 {_rows.Count} 行";
                Log($"读取 {path} 共 {_rows.Count} 行");
                SaveUiToConfig();
            }
            catch (Exception ex)
            {
                Log("读取 Excel 失败: " + ex.Message);
                MessageBox.Show(this, "读取 Excel 失败:\n" + ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        // ------------------------------------------------------------- Area 修正
        private async Task FixAreaAsync()
        {
            SaveUiToConfig();
            if (string.IsNullOrWhiteSpace(_cfg.IterationPath))
            {
                MessageBox.Show(this, "请先选择目标 Iteration", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            if (string.IsNullOrWhiteSpace(_cfg.AreaPath))
            {
                MessageBox.Show(this, "请先在 config.json 中设置 AreaPath（如 Tools_Dev\\DataTechnologies）", "提示",
                    MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            var confirm = MessageBox.Show(this,
                $"将把 迭代「{_cfg.IterationPath}」下 类型={_cfg.WorkItemType} 且 Area≠{_cfg.AreaPath} 的工作项\nArea 改为 {_cfg.AreaPath}。\n\n注意：已关闭（如 Done）的工作项会被临时重新打开，改完 Area 后自动还原状态。\n\n确认执行？",
                "确认", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
            if (confirm != DialogResult.Yes) return;

            _btnFixArea.Enabled = false;
            try
            {
                using (var client = new TfsClient(_cfg))
                {
                    var r = await client.FixAreaAsync(_cfg.Project, _cfg.IterationPath, _cfg.WorkItemType, _cfg.AreaPath, Log);
                    var summary = r.Item2 > 0
                        ? $"Area 修正完成：成功 {r.Item1} 条，失败 {r.Item2} 条（详见日志）"
                        : $"Area 修正完成，共 {r.Item1} 条";
                    _lblStatus.Text = summary;
                    Log(summary);
                    MessageBox.Show(this, summary, r.Item2 > 0 ? "部分完成" : "完成",
                        MessageBoxButtons.OK, r.Item2 > 0 ? MessageBoxIcon.Warning : MessageBoxIcon.Information);
                }
            }
            catch (Exception ex)
            {
                Log("Area 修正失败: " + ex.Message);
                MessageBox.Show(this, "Area 修正失败:\n" + ex.Message, "错误",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                _btnFixArea.Enabled = true;
            }
        }

        // ------------------------------------------------------------- 补挂父项
        private async Task LinkParentAsync()
        {
            SaveUiToConfig();
            if (string.IsNullOrWhiteSpace(_cfg.IterationPath))
            {
                MessageBox.Show(this, "请先选择目标 Iteration", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            if (!int.TryParse(_cfg.ParentPbiId, out var parentId))
            {
                MessageBox.Show(this, "请先在「父PBI Id」输入框填入父工作项 Id（纯数字）", "提示",
                    MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            var confirm = MessageBox.Show(this,
                $"将把 迭代「{_cfg.IterationPath}」下 类型={_cfg.WorkItemType} 且尚无父项的工作项\n补挂为 #{parentId} 的子项。\n\n已有父项的自动跳过；已关闭的工作项会临时重新打开，挂完自动还原状态。\n\n确认执行？",
                "确认", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
            if (confirm != DialogResult.Yes) return;

            _btnLinkParent.Enabled = false;
            try
            {
                using (var client = new TfsClient(_cfg))
                {
                    var r = await client.LinkExistingAsync(_cfg.Project, _cfg.IterationPath,
                        _cfg.WorkItemType, parentId, Log);
                    var summary = $"补挂完成: 挂接 {r.Item1} / 已有父跳过 {r.Item2} / 失败 {r.Item3}";
                    _lblStatus.Text = summary;
                    Log(summary);
                    MessageBox.Show(this, summary + "\n挂接后在积压工作页展开父项即可看到子项。",
                        r.Item3 > 0 ? "部分完成" : "完成", MessageBoxButtons.OK,
                        r.Item3 > 0 ? MessageBoxIcon.Warning : MessageBoxIcon.Information);
                }
            }
            catch (Exception ex)
            {
                Log("补挂父项失败: " + ex.Message);
                MessageBox.Show(this, "补挂父项失败:\n" + ex.Message, "错误",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                _btnLinkParent.Enabled = true;
            }
        }

        // ------------------------------------------------------------- 导入
        private async Task ImportAsync()
        {
            SaveUiToConfig();

            if (string.IsNullOrWhiteSpace(_cfg.IterationPath))
            {
                MessageBox.Show(this, "请先选择目标 Iteration（可点击“加载迭代列表”）", "提示",
                    MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            var path = _txtExcel.Text.Trim();
            if (string.IsNullOrEmpty(path) || !File.Exists(path))
            {
                MessageBox.Show(this, "请先选择有效的 Excel 文件", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            if (_rows.Count == 0)
            {
                try { _rows = ExcelService.ReadRows(path); }
                catch (Exception ex)
                {
                    MessageBox.Show(this, "读取 Excel 失败:\n" + ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }
            }
            if (_rows.Count == 0)
            {
                MessageBox.Show(this, "Excel 中没有可导入的数据行", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }

            _btnImport.Enabled = false;
            _btnPreview.Enabled = false;
            int ok = 0, skip = 0, fail = 0;
            var report = new StringBuilder();
            report.AppendLine("行号,Title,结果,WorkItemId,错误");

            try
            {
                using (var client = new TfsClient(_cfg))
                {
                    Log("测试连接...");
                    Log(await client.TestConnectionAsync());

                    // 字段解析
                    var fieldMap = await client.GetFieldMapAsync();
                    var titleRef = "System.Title";
                    var stateRef = "System.State";
                    var assignedRef = "System.AssignedTo";
                    var iterationRef = "System.IterationPath";
                    var areaRef = "System.AreaPath";
                    var createdRef = "System.CreatedDate";
                    var closedRef = "Microsoft.VSTS.Common.ClosedDate";

                    var finRef = TfsClient.ResolveRef(fieldMap, "FinancialProject", _cfg.FinancialProjectRef);
                    var compRef = TfsClient.ResolveRef(fieldMap, "Completed", _cfg.CompletedRef);
                    var logRef = TfsClient.ResolveRef(fieldMap, "LogDate", _cfg.LogDateRef);
                    Log($"字段: FinancialProject->{finRef ?? "(未找到)"}  Completed->{compRef ?? "(未找到)"}  LogDate->{logRef ?? "(未找到)"}");
                    Log($"父PBI: '{(string.IsNullOrWhiteSpace(_cfg.ParentPbiId) ? "(未填)" : _cfg.ParentPbiId)}'——Excel 每行可用 PBI Id 列覆盖");

                    HashSet<string> existing = null;
                    if (_chkSkip.Checked)
                    {
                        Log("查询已有工作项标题...");
                        existing = await client.GetExistingTitlesAsync(_cfg.Project, _cfg.IterationPath, _cfg.WorkItemType);
                        Log($"服务器已有 {existing.Count} 条");
                    }

                    for (int i = 0; i < _rows.Count; i++)
                    {
                        var row = _rows[i];
                        var line = i + 2; // Excel 实际行号(含表头)
                        try
                        {
                            if (existing != null && existing.Contains(row.Title))
                            {
                                skip++;
                                report.AppendLine($"{line},\"{row.Title}\",SKIP,,标题已存在");
                                Log($"[{i + 1}/{_rows.Count}] SKIP  {row.Title}");
                                continue;
                            }

                            var fields = new List<KeyValuePair<string, object>>
                            {
                                new KeyValuePair<string, object>(titleRef, row.Title),
                                new KeyValuePair<string, object>(stateRef,
                                    string.IsNullOrWhiteSpace(row.State) ? _cfg.DefaultState : row.State.Trim()),
                                new KeyValuePair<string, object>(iterationRef, _cfg.IterationPath)
                            };
                            if (!string.IsNullOrWhiteSpace(row.AssignedTo))
                                fields.Add(new KeyValuePair<string, object>(assignedRef, row.AssignedTo.Trim()));
                            if (!string.IsNullOrWhiteSpace(_cfg.AreaPath))
                                fields.Add(new KeyValuePair<string, object>(areaRef, _cfg.AreaPath.Trim()));
                            if (!string.IsNullOrWhiteSpace(row.FinancialProject) && finRef != null)
                                fields.Add(new KeyValuePair<string, object>(finRef, row.FinancialProject.Trim()));

                            var completed = ExcelService.ToNumber(row.Completed);
                            if (completed != null && compRef != null)
                                fields.Add(new KeyValuePair<string, object>(compRef, completed));

                            // Notes -> Description（该 Task 模板必填）
                            if (!string.IsNullOrWhiteSpace(row.Notes))
                                fields.Add(new KeyValuePair<string, object>("System.Description", row.Notes.Trim()));

                            var logDate = ExcelService.ToIsoDateTime(row.LogDate);
                            if (logDate != null && logRef != null)
                                fields.Add(new KeyValuePair<string, object>(logRef, logDate));

                            // 系统日期字段：bypassRules 时尝试写入
                            if (_chkBypass.Checked)
                            {
                                var created = ExcelService.ToIsoDateTime(row.CreatedDate);
                                if (created != null)
                                    fields.Add(new KeyValuePair<string, object>(createdRef, created));
                                var closed = ExcelService.ToIsoDateTime(row.ClosedDate);
                                if (closed != null)
                                    fields.Add(new KeyValuePair<string, object>(closedRef, closed));
                            }

                            // 父 PBI：行级 PBI Id 列优先，其次界面默认值
                            var pbiText = !string.IsNullOrWhiteSpace(row.PbiId) ? row.PbiId.Trim() : _cfg.ParentPbiId;
                            int? parentPbi = int.TryParse(pbiText, out var pbiNum) ? pbiNum : (int?)null;

                            var id = await client.CreateWorkItemAsync(_cfg.Project, _cfg.WorkItemType, fields, _chkBypass.Checked, parentPbi);
                            ok++;
                            report.AppendLine($"{line},\"{row.Title}\",OK,{id},");
                            Log($"[{i + 1}/{_rows.Count}] OK    #{id}  {row.Title}");
                        }
                        catch (Exception ex)
                        {
                            fail++;
                            report.AppendLine($"{line},\"{row.Title}\",FAIL,,\"{ex.Message.Replace("\"", "'")}\"");
                            Log($"[{i + 1}/{_rows.Count}] FAIL  {row.Title}  -> {ex.Message}");
                        }
                        _lblStatus.Text = $"导入中 {i + 1}/{_rows.Count}...";
                    }
                }
            }
            catch (Exception ex)
            {
                Log("导入中断: " + ex.Message);
                MessageBox.Show(this, "导入中断:\n" + ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                _btnImport.Enabled = true;
                _btnPreview.Enabled = true;
                try
                {
                    var reportPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory,
                        "import_report_" + DateTime.Now.ToString("yyyyMMdd_HHmmss") + ".csv");
                    File.WriteAllText(reportPath, report.ToString(), Encoding.UTF8);
                    Log($"报告已保存: {reportPath}");
                }
                catch (Exception ex) { Log("写报告失败: " + ex.Message); }
                _lblStatus.Text = $"完成: 成功 {ok} / 跳过 {skip} / 失败 {fail}";
                Log($"汇总: 成功 {ok} / 跳过 {skip} / 失败 {fail}");
                MessageBox.Show(this, $"导入完成。\n成功 {ok} / 跳过 {skip} / 失败 {fail}\n详见日志与报告 CSV。",
                    "完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }
    }
}