using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Windows.Forms;
using GeoSigmaDrawLib;
using Microsoft.VisualBasic.Devices;
using UCDraw;

namespace SymbolLibManager
{
    /// <summary>
    /// 符号管理界面
    /// 这个类有两个作用：一是符号及符号组的增删改查，一是供图层/图元修饰时选择符号
    /// 基础概念：
    /// 最左侧一栏我们称为符号组，对应一个符号文件
    /// 中间那栏我们称为符号
    /// 右边那栏是符号详情和编辑
    /// </summary>
    public partial class FrmMarkMain : Form
    {
        public string LibPath { get; set; }

        private const string CurrentFile = "当前文件";
        private readonly List<ListViewItem> arrItemsCache = new List<ListViewItem>();
        private ImageList lstSymbolImage;
        public bool IsDirty { get; set; } = false;

        public const string ClipboardFormatSymbol = "ClipboardFormatSymbol";

        private string SelectedFile = "";

        private bool OnSearchStatus = false;
        private GeoSigma.UCDraw.MainView mainView;
        private readonly DelayedRefreshHelper refreshHelper;
        private const int delay = 100;

        public GeoSigmaXY DrawerGeo { get; set; }

        /// <summary>
        /// 是否显示为符号选择状态
        /// </summary>
        public bool ShowInSelectMode { get; set; } = false;

        public string SelectedSymbolName { get; set; } = null;

        public FrmMarkMain(string dataPath) : this(null, dataPath)
        {
        }

        public FrmMarkMain(GeoSigmaXY geo, string dataPath)
        {
            InitializeComponent();

            DrawerGeo = geo;

            InitSymbolGroup(dataPath);
            InitSymbols();
            SelectFirstGroup();

            refreshHelper = new DelayedRefreshHelper(delay, ShowSelectedSymbolGroup);
        }

        private void SelectFirstGroup()
        {
            if (trvSymbol.Nodes.Count > 0)
            {
                TreeNode firstChild = trvSymbol.Nodes[0];
                if (firstChild != null && firstChild.Nodes.Count > 0)
                {
                    TreeNode firstGrandchild = firstChild.Nodes[0];
                    trvSymbol.SelectedNode = firstGrandchild;
                }
            }
        }

        private void InitSymbolGroup(string dataPath)
        {
            if (string.IsNullOrEmpty(dataPath))
            {
                // 符号表默认目录
                var symbolFilePath = Directory.GetParent(Application.StartupPath);
                LibPath = Path.Combine(symbolFilePath.FullName, "Symbol");
            }
            else
            {
                LibPath = dataPath;
            }

            string symbolData = "";
            GeoSigmaXY.InitLibrary(LibPath, ref symbolData);
            InitSymbolTree(symbolData);
        }

        private void InitSymbols()
        {
            lstSymbolImage = new ImageList();
            lstSymbolImage.ColorDepth = ColorDepth.Depth24Bit;
            lstSymbolImage.ImageSize = new Size(50, 50);

            lsvSymbol.LargeImageList = lstSymbolImage;
            lsvSymbol.View = View.LargeIcon;
            lsvSymbol.HideSelection = false;
            lsvSymbol.VirtualMode = true;
            lsvSymbol.MultiSelect = false;
            lsvSymbol.LabelEdit = true;
            lsvSymbol.ContextMenuStrip = ctmSymbols;
        }

        private void ApplicationIdle(object sender, EventArgs e)
        {
            try
            {
                bool bHasSelected = lsvSymbol.SelectedIndices.Count > 0;
                bool bHasClip = false;
                var clipData = Clipboard.GetData(ClipboardFormatSymbol);
                if (clipData is List<string> lstPxy)
                {
                    if (lstPxy.Count > 0)
                    {
                        bHasClip = true;
                    }
                }
                // 粘贴、添加
                tsbtnSymbolPaste.Enabled = (bHasClip && OnSearchStatus == false);
                ctsbtnPasteSymbol.Enabled = tsbtnSymbolPaste.Enabled;

                tsbtnListAdd.Enabled = !OnSearchStatus;
                if (string.IsNullOrEmpty(SelectedFile))
                {
                    tsbtnListAdd.Enabled = false;
                }
                // 复制
                tsbtnSymbolCopy.Enabled = bHasSelected;
                ctsbtnCopySymbol.Enabled = tsbtnSymbolCopy.Enabled;
                // 删除、编辑
                tsbtnListRemove.Enabled = tsbtnSymbolCopy.Enabled; // (!OnSearchStatus && bHasSelected);
                ctsbtnDeleteSymbol.Enabled = tsbtnListRemove.Enabled;
                tsbtnEdit.Enabled = tsbtnListRemove.Enabled;
                ctsbtnEditName.Enabled = tsbtnEdit.Enabled;

                var root = trvSymbol.Nodes[0];
                bool bGroupChecked = false;
                foreach (TreeNode node in root.Nodes)
                {
                    if (node.Checked)
                    {
                        bGroupChecked = true;
                        break;
                    }
                }
                tsbtnDeleteFile.Enabled = bGroupChecked;
                tsbtnExportFile.Enabled = bGroupChecked;
            }
            catch
            {
            }
        }

        /// <summary>
        /// 初始化最左侧的符号组
        /// </summary>
        /// <param name="nodeData">以分号分割的字符串，表示符号组列表</param>
        private void InitSymbolTree(string nodeData)
        {
            var root = trvSymbol.Nodes.Add("符号库");
            root.ImageIndex = 1;
            root.SelectedImageIndex = 1;
            root.StateImageIndex = 1;

            root.Nodes.AddRange(nodeData.Split(';')
                .Where(itemData => !string.IsNullOrEmpty(itemData))
                .Select(itemData => new TreeNode
                {
                    Text = Path.GetFileNameWithoutExtension(itemData),
                    ImageIndex = 0,
                    Tag = itemData
                })
                .ToArray());

            // 如果当前有选中文件，符号组中添加当前文件
            if (DrawerGeo != null)
            {
                TreeNode currentNode = new TreeNode
                {
                    Text = CurrentFile,
                    Tag = CurrentFile,

                };

                root.Nodes.Insert(0, currentNode);
            }

            root.Expand();
        }

        private void lsvSymbol_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
        {
            if (arrItemsCache == null || arrItemsCache.Count == 0)
            {
                e.Item = new ListViewItem();
            }
            e.Item = arrItemsCache[e.ItemIndex];
        }

        protected override void OnClosed(EventArgs e)
        {
            mainView.CloseFaultEditor();

            base.OnClosed(e);
        }

        private void FrmMarkMain_Load(object sender, EventArgs e)
        {
            mainView = new GeoSigma.UCDraw.MainView();
            //设置窗体最大化
            mainView.Dock = DockStyle.Fill;
            //指定当前子窗体显示的容器
            mainView.Parent = spMain.Panel2;
            mainView.BringToFront();
            mainView.Show();
            mainView.PropertyVisible = true;
            mainView.LayerVisible = false;
            mainView.StatisticVisble = false;
            mainView.ToolstripView.Visible = false;
            mainView.BeforeSaveFileEvent += MainView_SaveFile;
            mainView.AutoReleaseView = false;

            DrawerEnable(false);
            SetUIMode();

            Application.Idle += ApplicationIdle;
        }

        private void SetUIMode()
        {
            if (ShowInSelectMode)
            {
                spMain.Panel2Collapsed = true;
                tspTree.Visible = false;
                tspItems.Visible = false;

                tsbtnOK.Visible = true;
                tsbtnCancel.Visible = true;
            }
        }

        private ListViewItem CreateSymbolItem(string symbolName, int imageIndex, SymbolItemData itemData)
        {
            ListViewItem item = new ListViewItem(symbolName);
            item.Name = symbolName;
            item.ImageIndex = imageIndex;
            item.Tag = itemData;
            return item;
        }

        /// <summary>
        /// 获取分组的符号列表
        /// </summary>
        /// <param name="group">分组名称</param>
        /// <returns></returns>
        private List<string> GetGroupSymbolNames(string group)
        {
            if (group == null)
            {
                return new List<string>();
            }

            SelectedFile = group;
            if (string.IsNullOrEmpty(SelectedFile))
            {
                return new List<string>();
            }

            return ListSymbols(SelectedFile);
        }

        /// <summary>
        /// 添加符号
        /// </summary>
        /// <param name="symbol"></param>
        private void AddSymbol(SymbolItemData symbol)
        {
            CreateBitMap(symbol.Group, symbol.Name, out Bitmap bmp, out IntPtr pXy);

            SymbolItemData itemData = new SymbolItemData();
            itemData.Group = symbol.Group;
            itemData.Name = symbol.Name;
            itemData.PtrXY = pXy;

            ListViewItem item = CreateSymbolItem(symbol.Name, arrItemsCache.Count, itemData);

            lstSymbolImage.Images.Add(bmp);
            arrItemsCache.Add(item);
            lsvSymbol.VirtualListSize = arrItemsCache.Count;
        }

        /// <summary>
        /// 查找符号
        /// </summary>
        /// <returns></returns>
        private List<SymbolItemData> FindSymbol(string text)
        {
            List<SymbolItemData> result = new List<SymbolItemData>();

            foreach (string group in ListAllGroups())
            {
                List<string> symbols = ListSymbols(group);
                foreach (string symbol in symbols)
                {
                    if (!symbol.Contains(text))
                    {
                        continue;
                    }

                    var item = new SymbolItemData()
                    {
                        Name = symbol,
                        Group = group,
                    };

                    result.Add(item);
                }
            }

            return result;
        }

        /// <summary>
        /// 清除当前的符号
        /// </summary>
        private void ClearSymbols()
        {
            foreach (Image image in lstSymbolImage.Images)
            {
                image.Dispose();
            }

            arrItemsCache.Clear();
            lstSymbolImage.Images.Clear();
            lsvSymbol.VirtualListSize = arrItemsCache.Count;
        }

        /// <summary>
        /// 查出所有符号组
        /// </summary>
        /// <returns>返回符号组列表</returns>
        private List<string> ListAllGroups()
        {
            TreeNode rootNode = trvSymbol.Nodes[0];
            return rootNode.Nodes.Cast<TreeNode>()
                .Select(node => node.Tag.ToString())
                .ToList();
        }

        private void RemoveGroup(string group)
        {
            GeoSigmaXY.LibraryRemoveGroup(group);
            try
            {
                File.Delete(group);
            }
            catch
            {
            }
        }

        private List<string> ListSymbols(string group)
        {
            // 获取符号名称列表的逻辑
            string strNames = string.Empty;

            if (group.Equals(CurrentFile))
            {
                // 当前文件时
                DrawerGeo?.GetDrawerSymbolNames(ref strNames);
            }
            else
            {
                GeoSigmaXY.GetLibrarySymbolNames(group, ref strNames);
            }

            List<string> symbols = strNames.Split(';')
                .Where(name => !string.IsNullOrEmpty(name))
                .OrderBy(name => name)
                .ToList();

            return symbols;
        }

        /// <summary>
        /// 构建同一组的符号
        /// </summary>
        /// <param name="group">符号组</param>
        /// <param name="symbols"></param>
        private void BuildSymbols(string group, List<string> symbols)
        {
            foreach (string symbol in symbols)
            {
                SymbolItemData item = new SymbolItemData()
                {
                    Name = symbol,
                    Group = group,
                };
                AddSymbol(item);
            }
        }

        private void BuildSymbols(List<SymbolItemData> symbols)
        {
            foreach (SymbolItemData item in symbols)
            {
                AddSymbol(item);
            }
        }

        /// <summary>
        /// 显示左侧选中的符号组
        /// </summary>
        private void ShowSelectedSymbolGroup()
        {
            TreeNode node = trvSymbol.SelectedNode;

            OnSearchStatus = false;

            string group = node.Tag?.ToString();
            if (group == null)
            {
                return;
            }

            ClearSymbols();
            List<string> symbolNames = GetGroupSymbolNames(group);
            BuildSymbols(group, symbolNames);

            if (lsvSymbol.Items.Count > 0)
            {
                lsvSymbol.Items[0].Selected = true;
            }
            else
            {
                // 如果该组没有任何符号，要清理最右侧的显示，不然会显示上次打开的内容
                ClearymbolDetials();
            }

            string strGroupName = Path.GetFileNameWithoutExtension(group);
            statusLableGroup.Text = $"所属: {strGroupName}";
        }

        private void CreateBitMap(string group, string symbolName, out Bitmap bmp, out IntPtr pXy)
        {
            bmp = new Bitmap(50, 50);
            Graphics gBmp = Graphics.FromImage(bmp);
            IntPtr pBmpDC = gBmp.GetHdc();
            pXy = IntPtr.Zero;

            if (group.Equals(CurrentFile))
            {
                DrawerGeo?.DrawerDrawSymbol(symbolName, pBmpDC, 50, 50, ref pXy);
            }
            else
            {
                GeoSigmaXY.LibaryDrawSymbol(group, symbolName, pBmpDC, 50, 50, ref pXy);
            }

            gBmp.ReleaseHdc();
        }

        private void CreateBitMap(string symbolName, out Bitmap bmp, out IntPtr pXy)
        {
            bmp = new Bitmap(50, 50);
            Graphics gBmp = Graphics.FromImage(bmp);
            IntPtr pBmpDC = gBmp.GetHdc();
            pXy = IntPtr.Zero;

            if (SelectedFile.Equals(CurrentFile))
            {
                DrawerGeo?.DrawerDrawSymbol(symbolName, pBmpDC, 50, 50, ref pXy);
            }
            else
            {
                GeoSigmaXY.LibaryDrawSymbol(SelectedFile, symbolName, pBmpDC, 50, 50, ref pXy);
            }

            gBmp.ReleaseHdc();
        }

        private void trvSymbol_AfterSelect(object sender, TreeViewEventArgs e)
        {
            //refreshHelper.SelectionChange();
            ShowSelectedSymbolGroup();
        }

        /// <summary>
        /// 关闭前
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void FrmMarkMain_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (!SelectedFile.Equals(CurrentFile) && mainView.IsDocumentModified())
            {
                IsDirty = true;
            }
            if (IsDirty)
            {
                DialogResult result = MessageBox.Show(
                    this,
                    "是否保存修改?",
                     "关闭文档",
                     MessageBoxButtons.YesNoCancel);
                switch (result)
                {
                    case DialogResult.Yes:
                        // 保存文件
                        MainView_SaveFile(new CancelEventArgs());
                        break;
                    case DialogResult.Cancel:
                        e.Cancel = true;
                        return;
                    case DialogResult.No:
                        break;
                }
            }
        }

        private void FrmMarkMain_FormClosed(object sender, FormClosedEventArgs e)
        {
            Application.Idle -= ApplicationIdle;
            DrawerGeo?.ResetSymbol();
            ClearSymbols();
        }

        private void MainView_SaveFile(CancelEventArgs e)
        {
            if (!SelectedFile.Equals(CurrentFile) && mainView.IsDocumentModified())
            {
                IsDirty = true;
            }
            if (!IsDirty)
            {
                e.Cancel = true;
                return;
            }
            bool bSaved = GeoSigmaXY.LibarySaveAll();
            if (bSaved)
            {
                mainView.SetDocumentModified(!bSaved);

                // 重新激活左侧当前符号组，让它刷新缩略图
                //TreeNode node = trvSymbol.SelectedNode;
                //trvSymbol.SelectedNode = null;
                //trvSymbol.SelectedNode = node;
                updateCurrentSymbolIcon();
            }
            IsDirty = !bSaved;
            if (e != null)
            {
                e.Cancel = true;
            }
        }

        /// <summary>
        /// 查找符号事件
        /// </summary>
        /// <param name="sender">查找按钮</param>
        /// <param name="e">事件参数</param>
        private void tsbtnFindSymbol_Click(object sender, EventArgs e)
        {
            string strSearchName = txtSearchName.Text.Trim();
            if (string.IsNullOrEmpty(strSearchName))
            {
                return;
            }
            // 设置查询状态标识
            OnSearchStatus = true;

            ClearSymbols();
            List<SymbolItemData> symbols = FindSymbol(strSearchName);
            BuildSymbols(symbols);
        }

        private void txtSearchName_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)Keys.Enter)
            {
                e.Handled = true;
                SendKeys.Send("{TAB}");
                tsbtnFindSymbol.PerformClick();
            }
        }

        /// <summary>
        /// 确定
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbtnOK_Click(object sender, EventArgs e)
        {
            if (lsvSymbol.SelectedIndices.Count <= 0)
            {
                MessageBox.Show("没有选中任何符号！");
                return;
            }
            ListViewItem itemLast = lsvSymbol.Items[lsvSymbol.SelectedIndices[0]];
            SymbolItemData itemDataLast = itemLast.Tag as SymbolItemData;
            string strName = itemDataLast.Name;

            // 检查名称重复
            ListViewItem lviFind = arrItemsCache.Find(p =>
            {
                return p.Text.Equals(strName,
                    StringComparison.CurrentCultureIgnoreCase);
            });
            if (lviFind != null)
            {
                IntPtr pxyNew = IntPtr.Zero;
                DrawerGeo.DrawerCopySymbol(itemDataLast.PtrXY, strName, ref pxyNew);
            }
            SelectedSymbolName = strName;
            DialogResult = DialogResult.OK;
            Close();
        }

        /// <summary>
        /// 取消
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbtnCancel_Click(object sender, EventArgs e)
        {
            if (IsDirty)
            {
                DialogResult result = MessageBox.Show(this,
                    "符号已修改，是否放弃修改并退出符号管理界面？",
                    "退出",
                    MessageBoxButtons.YesNo);
                if (result == DialogResult.No)
                {
                    return;
                }
            }
            DialogResult = DialogResult.Cancel;
            Close();
        }

        /// <summary>
        /// 修改符号名称
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbtnEdit_Click(object sender, EventArgs e)
        {
            ListView.SelectedIndexCollection selItems = lsvSymbol.SelectedIndices;

            if (selItems.Count > 0)
            {
                lsvSymbol.Items[selItems[0]].BeginEdit();
            }
        }

        /// <summary>
        /// 修改符号名称
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void lsvSymbol_AfterLabelEdit(object sender, LabelEditEventArgs e)
        {
            if (e.Label == null)
            {
                return;
            }
            string newName = e.Label.Trim();
            if (string.IsNullOrEmpty(newName))
            {
                MessageBox.Show("此名称不能为空！");
                e.CancelEdit = true;
                return;
            }

            ListViewItem lvi = lsvSymbol.Items[e.Item];
            ListViewItem lviFind = null;
            if (arrItemsCache != null)
            {
                lviFind = arrItemsCache.FirstOrDefault(item =>
                    item.Text.Equals(newName, StringComparison.CurrentCultureIgnoreCase));
            }
            else
            {
                var ie = lsvSymbol.Items.GetEnumerator();
                while (ie.MoveNext())
                {
                    ListViewItem lviCur = (ListViewItem)ie.Current;
                    if (lviCur.Text.Equals(newName, StringComparison.CurrentCultureIgnoreCase))
                    {
                        lviFind = lviCur;
                        break;
                    }
                }
            }
            if (lviFind != null)
            {
                MessageBox.Show("此名称已经存在！");
                e.CancelEdit = true;
                return;
            }

            lvi.Text = newName;
            lvi.Name = newName;
            IntPtr ptr = ((SymbolItemData)(lvi.Tag)).PtrXY;
            if (!SelectedFile.Equals(CurrentFile))
            {
                IsDirty = GeoSigmaXY.SetDrawXyName(ptr, ((SymbolItemData)(lvi.Tag)).Group, newName);
                ((SymbolItemData)(lvi.Tag)).Name = newName;
                IsDirty = true;
            }
            else
            {
                DrawerGeo.RenameSymble(((SymbolItemData)(lvi.Tag)).Name, newName);

                ((SymbolItemData)(lvi.Tag)).Name = newName;
            }
        }

        /// <summary>
        /// 显示符号预览图大图，最右侧那块儿
        /// </summary>
        /// <param name="itemData">标识数据</param>
        private void ShowSymbolDetials(SymbolItemData itemData)
        {
            if (!SelectedFile.Equals(CurrentFile) && mainView.IsDocumentModified())
            {
                IsDirty = true;
            }

            mainView.Visible = true;
            mainView.OpenXy(itemData.PtrXY);
            mainView.SetBackColor(192, 192, 192);
            mainView.SetSymbolView(true);
            RectangleF rect = new RectangleF(-1, -1, 2, 2);
            mainView.InitlizePaint(rect);

            DrawerEnable(true);
        }

        /// <summary>
        /// 清空符号预览图大图
        /// </summary>
        private void ClearymbolDetials()
        {
            if (mainView != null)
            {
                mainView.Visible = false;
            }
        }

        /// <summary>
        /// 选择符号
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>

        private void lsvSymbol_ItemSelectionChanged(object sender, ListViewItemSelectionChangedEventArgs e)
        {
            if (e.IsSelected == false || e.Item.Tag == null)
            {
                return;
            }

            SymbolItemData itemData = e.Item.Tag as SymbolItemData;
            // 非选择模式
            if (!ShowInSelectMode)
            {
                ShowSymbolDetials(itemData);
            }

            statusLableGroup.Text = $"所属: {Path.GetFileNameWithoutExtension(itemData.Group)}";
        }
        /// <summary>
        /// updates the current symbol icon.
        /// </summary>
        private void updateCurrentSymbolIcon()
        {
            if (lsvSymbol.SelectedIndices != null && lsvSymbol.SelectedIndices.Count > 0)
            {
                ListView.SelectedIndexCollection indices = lsvSymbol.SelectedIndices;
                int nIndex = indices[0];
                ListViewItem item = arrItemsCache[nIndex];// lsvSymbol.Items[nIndex];

                //lstSymbolImage.Images.Add(bmp);
                //arrItemsCache.Add(item);
                SymbolItemData itemData = item.Tag as SymbolItemData;

                Bitmap bmp = lstSymbolImage.Images[nIndex] as Bitmap;
                Graphics gBmp = Graphics.FromImage(bmp);
                gBmp.Clear(Color.White);
                IntPtr pBmpDC = gBmp.GetHdc();

                IntPtr pXy = itemData.PtrXY;
                GeoSigmaXY.XyDrawSymbol(pXy, pBmpDC, 50, 50);
                gBmp.ReleaseHdc();
                lstSymbolImage.Images[nIndex] = bmp;

                lsvSymbol.Invalidate();
            }
        }
        private void lsvSymbol_ItemCheck(object sender, ItemCheckEventArgs e)
        {
            CheckState status = e.NewValue;
        }

        private void lsvSymbol_ItemChecked(object sender, ItemCheckedEventArgs e)
        {
            bool bChecked = e.Item.Checked;
        }

        private string NewSymbolName()
        {
            for (int newSymbolIdx = 1; newSymbolIdx < int.MaxValue; newSymbolIdx++)
            {
                string strSymbolName = "新建符号" + newSymbolIdx;
                if (!arrItemsCache.Any(p => p.Text.Equals(strSymbolName, StringComparison.CurrentCultureIgnoreCase)))
                {
                    return strSymbolName;
                }
            }

            return string.Empty;
        }

        /// <summary>
        /// 添加符号
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbtnListAdd_Click(object sender, EventArgs e)
        {
            string strSymbolName = NewSymbolName();

            IntPtr pXy = IntPtr.Zero;
            Bitmap bmp = new Bitmap(50, 50);
            Graphics gBmp = Graphics.FromImage(bmp);
            gBmp.Clear(Color.White);
            IntPtr pBmpDC = gBmp.GetHdc();

            // 当前文件时
            if (SelectedFile.Equals(CurrentFile))
            {
                DrawerGeo.CreateDrawerSymbol(strSymbolName, ref pXy);
                DrawerGeo.DrawerDrawSymbol(strSymbolName, pBmpDC, 50, 50, ref pXy);
            }
            else
            {
                GeoSigmaXY.CreateLibrarySymbol(SelectedFile, strSymbolName, ref pXy);
                GeoSigmaXY.LibaryDrawSymbol(SelectedFile, strSymbolName, pBmpDC, 50, 50, ref pXy);
            }
            gBmp.ReleaseHdc();

            SymbolItemData itemData = new SymbolItemData()
            {
                Group = SelectedFile,
                Name = strSymbolName,
                PtrXY = pXy,
            };

            ListViewItem item = new ListViewItem(strSymbolName);
            item.Name = strSymbolName;
            item.ImageIndex = lstSymbolImage.Images.Count;
            item.Tag = itemData;

            arrItemsCache.Add(item);
            lstSymbolImage.Images.Add(bmp);
            lsvSymbol.VirtualListSize = arrItemsCache.Count;

            SelectSymbol(arrItemsCache.Count - 1);
            IsDirty = true;
        }

        private void SelectSymbol(int nIndex)
        {
            lsvSymbol.Focus();
            if (nIndex >= lsvSymbol.Items.Count)
            {
                return;
            }
            lsvSymbol.Items[nIndex].Selected = true;
            if (lsvSymbol.SelectedIndices != null && lsvSymbol.SelectedIndices.Count > 0)
            {
                ListView.SelectedIndexCollection indices = lsvSymbol.SelectedIndices;
                lsvSymbol.Items[indices[0]].Selected = false;
            }
            lsvSymbol.Items[nIndex].Selected = true;
            lsvSymbol.EnsureVisible(nIndex);
        }

        /// <summary>
        ///  移除符号
        /// </summary>
        /// <param name="index">符号下标</param>
        private void RemoveSymbol(int index)
        {
            string strName = lsvSymbol.Items[index].Text;
            SymbolItemData itemData = lsvSymbol.Items[index].Tag as SymbolItemData;
            IntPtr pXy = itemData.PtrXY;

            ListViewItem cachedItem = arrItemsCache.FirstOrDefault(item =>
            {
                SymbolItemData itemDataFind = (SymbolItemData)item.Tag;
                return itemDataFind.PtrXY == pXy;
            });

            if (cachedItem != null)
            {
                arrItemsCache.Remove(cachedItem);
            }

            lsvSymbol.VirtualListSize = arrItemsCache.Count;

            if (pXy == IntPtr.Zero)
            {
                return;
            }

            if (SelectedFile.Equals(CurrentFile))
            {
                // 当前文件时
                DrawerGeo.RemoveDrawerSymbol(pXy);
            }
            else
            {
                IsDirty = GeoSigmaXY.RemoveLibrarySymbol(SelectedFile, pXy);
            }
        }

        /// <summary>
        /// 选中下一个符号
        /// </summary>
        /// <param name="index">被删除的 index 下标</param>
        private void SelectNextSymbol(int index)
        {
            if (index == arrItemsCache.Count)
            {
                index = arrItemsCache.Count - 1;
            }

            if (index >= 0 && index < arrItemsCache.Count)
            {
                lsvSymbol.Items[index].Selected = true;
            }
            else
            {
                // 清空画布
                DrawerEnable(false);
                mainView.ClearGeo();
            }
        }

        /// <summary>
        /// 删除符号
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbtnListRemove_Click(object sender, EventArgs e)
        {
            ListView.SelectedIndexCollection selItems = lsvSymbol.SelectedIndices;
            if (arrItemsCache == null || selItems.Count == 0)
            {
                return;
            }

            int index = selItems[0];

            RemoveSymbol(index);
            SelectNextSymbol(index);
        }

        private void DrawerEnable(bool enable)
        {
            mainView.ToolDefault();
            mainView.ToolstripElements.Enabled = enable;
            mainView.ToolstripView.Enabled = enable;
            //mainView.ToolAntiAlias(false);
        }

        /// <summary>
        /// 符号拷贝
        /// </summary>
        /// <param name="sender">拷贝按钮</param>
        /// <param name="e">事件参数</param>
        private void tsbtnSymbolCopy_Click(object sender, EventArgs e)
        {
            List<string> lstXyData = new List<string>();
            foreach (int indice in lsvSymbol.SelectedIndices)
            {
                var item = lsvSymbol.Items[indice];
                SymbolItemData itemData = (SymbolItemData)item.Tag;
                string strXyData = GeoSigmaXY.WriteXy2DFD(itemData.PtrXY);
                lstXyData.Add(strXyData);
            }
            if (lstXyData.Count > 0)
            {
                Clipboard.Clear();
                Clipboard.SetData(ClipboardFormatSymbol, lstXyData);
            }
        }

        /// <summary>
        /// 粘贴事件
        /// </summary>
        /// <param name="sender">粘贴按钮</param>
        /// <param name="e">事件参数</param>
        private void tsbtnSymbolPaste_Click(object sender, EventArgs e)
        {
            List<string> lstXyData = (List<string>)Clipboard.GetData(ClipboardFormatSymbol);
            if (lstXyData == null)
            {
                return;
            }
            foreach (string xyData in lstXyData)
            {
                IntPtr pXy = GeoSigmaXY.CreateXyFromDFD(xyData);
                string strName = GeoSigmaXY.GetDrawXyName(pXy);

                // 检查名称重复
                int nNameAppend = 0;
                string strNameSource = strName;
                while (true)
                {
                    if (nNameAppend == 0)
                    {
                        strName = strNameSource;
                    }
                    else
                    {
                        strName = $"{strNameSource}{nNameAppend}";
                    }
                    ListViewItem lviFind = arrItemsCache.Find(p =>
                    {
                        return p.Text.Equals(strName,
                            StringComparison.CurrentCultureIgnoreCase);
                    });
                    if (lviFind != null)
                    {
                        nNameAppend++;
                        continue;
                    }
                    break;
                }

                Bitmap bmp = new Bitmap(50, 50);
                Graphics gBmp = Graphics.FromImage(bmp);
                IntPtr pBmpDC = gBmp.GetHdc();
                IntPtr pxyNew = IntPtr.Zero;
                // 当前文件时
                if (SelectedFile.Equals(CurrentFile))
                {
                    DrawerGeo.DrawerCopySymbol(pXy, strName, ref pxyNew);
                    DrawerGeo.DrawerDrawSymbol(strName, pBmpDC, 50, 50, ref pxyNew);
                }
                else
                {
                    GeoSigmaXY.LibraryCopySymbol(SelectedFile, pXy, strName, ref pxyNew);
                    GeoSigmaXY.LibaryDrawSymbol(SelectedFile, strName, pBmpDC, 50, 50, ref pxyNew);

                    IsDirty = true;
                }
                gBmp.ReleaseHdc();
                lstSymbolImage.Images.Add(bmp);

                SymbolItemData itemData = new SymbolItemData();
                itemData.Name = strName;
                itemData.PtrXY = pxyNew;
                itemData.Group = SelectedFile;

                ListViewItem item = new ListViewItem(strName);
                item.Name = strName;
                item.ImageIndex = lstSymbolImage.Images.Count - 1;
                item.Tag = itemData;
                arrItemsCache.Add(item);
            }

            lsvSymbol.VirtualListSize = arrItemsCache.Count;
            SelectSymbol(arrItemsCache.Count - 1);
        }

        private void ctmSymbols_Opening(object sender, CancelEventArgs e)
        {
            //string strMsg = sender.ToString();
        }

        private string NewGroupName()
        {
            List<string> fileNames = Directory.EnumerateFiles(LibPath)
                .Select(path => Path.GetFileName(path))
                .ToList();

            for (int newIndex = 1; newIndex < int.MaxValue; newIndex++)
            {
                string newFileName = $"自定义符号{newIndex}.kev";
                if (!fileNames.Any(s => s.Equals(newFileName, StringComparison.OrdinalIgnoreCase)))
                {
                    return newFileName;
                }
            }

            return string.Empty;
        }

        /// <summary>
        /// 新建分组
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbtnNewGroup_Click(object sender, EventArgs e)
        {
            string newFilename = NewGroupName();
            string strNewFile = Path.Combine(LibPath, newFilename);
            File.Create(strNewFile).Close();

            AddNewGroup(strNewFile);
        }

        /// <summary>
        /// 添加新符号库
        /// </summary>
        /// <param name="strNewFile">符号文件</param>
        private void AddNewGroup(string strNewFile)
        {
            GeoSigmaXY.LibraryAddNewGroup(strNewFile);

            TreeNode tnGroup = new TreeNode();
            tnGroup.Text = Path.GetFileNameWithoutExtension(strNewFile);
            tnGroup.ImageIndex = 0;
            tnGroup.Tag = strNewFile;

            var root = trvSymbol.Nodes[0];
            root.Nodes.Add(tnGroup);

            trvSymbol.SelectedNode = tnGroup;
        }

        /// <summary>
        /// 删除分组
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbtnDeleteFile_Click(object sender, EventArgs e)
        {
            var root = trvSymbol.Nodes[0];
            List<TreeNode> lstCheckedNodes = root.Nodes.Cast<TreeNode>().Where(node => node.Checked).ToList();

            if (lstCheckedNodes.Count == 0)
            {
                return;
            }

            if (MessageBox.Show("是否删除选中符号库？") != DialogResult.OK)
            {
                return;
            }
            trvSymbol.BeginUpdate();
            TreeNode tnNext = lstCheckedNodes[lstCheckedNodes.Count - 1].NextNode;
            for (int i = 0; i < lstCheckedNodes.Count; i++)
            {
                string strFileName = lstCheckedNodes[i].Tag as string;
                RemoveGroup(strFileName);
                lstCheckedNodes[i].Remove();
            }
            trvSymbol.EndUpdate();
            ClearSymbols();

            if (tnNext == null && root.Nodes.Count > 0)
            {
                tnNext = root.Nodes[root.Nodes.Count - 1];
            }

            if (tnNext != null)
            {
                trvSymbol.SelectedNode = tnNext;
            }
        }

        /// <summary>
        /// 从文件导入符号
        /// </summary>
        /// <param name="sender">事件按钮</param>
        /// <param name="e">事件参数</param>
        private void tsbtnImportFile_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.RestoreDirectory = true;
            ofd.Filter = "*.kev|*.kev|*.pcg|*.pcg|*.*|*.*";
            if (ofd.ShowDialog() != DialogResult.OK)
            {
                return;
            }
            if (!Directory.Exists(LibPath))
            {
                Directory.CreateDirectory(LibPath);
            }

            string strFile = ofd.FileName;
            string strFileNew = string.Empty;

            // string strDir = Path.GetDirectoryName(strFile);
            string strOldName = Path.GetFileNameWithoutExtension(strFile);

            string[] straOldFiles = Directory.GetFiles(LibPath);
            string strFind = straOldFiles.FirstOrDefault(it =>
            {
                string strName = Path.GetFileNameWithoutExtension(it);
                return strName.Equals(strOldName);
            });

            if (strFind != null)
            {
                strOldName += "1";
                strFileNew = Path.Combine(LibPath, strOldName + Path.GetExtension(strFile));
            }
            else
            {
                strFileNew = Path.Combine(LibPath, Path.GetFileName(strFile));
            }
            Cursor.Current = Cursors.WaitCursor;
            trvSymbol.BeginUpdate();
            FileInfo fi = new FileInfo(strFile);
            fi.CopyTo(strFileNew);
            AddNewGroup(strFileNew);
            Cursor.Current = Cursors.Default;
            trvSymbol.EndUpdate();
        }

        /// <summary>
        /// 符号导出到文件
        /// </summary>
        /// <param name="sender">符号导出事件</param>
        /// <param name="e">事件参数</param>
        private void tsbtnExportFile_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog fldDlg = new FolderBrowserDialog();
            fldDlg.Description = @"将选中节点的符号导出到指定文件夹中。
文件名为符号的类别名。";
            if (fldDlg.ShowDialog() != DialogResult.OK)
            {
                return;
            }
            string strDir = fldDlg.SelectedPath;
            if (!Directory.Exists(strDir))
            {
                Directory.CreateDirectory(strDir);
            }
            // 保存编辑中的图形
            MainView_SaveFile(null);

            var root = trvSymbol.Nodes[0];
            List<TreeNode> lstCheckedNodes = new List<TreeNode>();
            foreach (TreeNode node in root.Nodes)
            {
                if (!node.Checked)
                {
                    continue;
                }
                string strFileSource = node.Tag as string;

                string strNameDes = Path.GetFileName(strFileSource);
                string strFileDes = Path.Combine(strDir, strNameDes);
                bool bOverwrite = false;
                if (File.Exists(strFileDes))
                {
                    DialogResult result = MessageBox.Show(this, $@"存在同名的文件“{strNameDes}”，覆盖还是跳过？
选择“是”，进行覆盖；
选择“否”，则跳过；
选择“取消”，则终止导入。",
                        "导出",
                        MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
                    if (result == DialogResult.Cancel)
                    {
                        break;
                    }
                    else if (result == DialogResult.Yes)
                    {
                        bOverwrite = true;
                    }
                    else
                    {
                        bOverwrite = false;
                        continue;
                    }
                }
                FileInfo fi = new FileInfo(strFileSource);
                try
                {
                    fi.CopyTo(strFileDes, bOverwrite);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
            MessageBox.Show("导出成功!");
        }

        /// <summary>
        /// 删除选中文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tmiDeleteFile_Click(object sender, EventArgs e)
        {
            if (trvSymbol.SelectedNode == null)
            {
                return;
            }

            DialogResult result = MessageBox.Show($"要删除选中“{trvSymbol.SelectedNode.Text}”吗？\r\n删除后不可恢复！"
                , "删除", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
            if (result != DialogResult.Yes)
            {
                return;
            }
            string strFileName = trvSymbol.SelectedNode.Tag as string;
            GeoSigmaXY.LibraryRemoveGroup(strFileName);
            trvSymbol.SelectedNode.Remove();
            try
            {
                File.Delete(strFileName);
            }
            catch
            {
            }
        }

        /// <summary>
        /// 重命名选中文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tmiRename_Click(object sender, EventArgs e)
        {
            trvSymbol.SelectedNode?.BeginEdit();
        }

        // 重命名符号组
        private void trvSymbol_AfterLabelEdit(object sender, NodeLabelEditEventArgs e)
        {
            if (string.IsNullOrEmpty(e.Label))
            {
                return;
            }
            string strFileName = trvSymbol.SelectedNode.Tag as string;

            string strNewFile = e.Label + Path.GetExtension(strFileName);
            string strNewFileFull = Path.Combine(Path.GetDirectoryName(strFileName), strNewFile);

            if (GeoSigmaXY.LibraryRenameGroup(strFileName, strNewFileFull) != true)
            {
                e.CancelEdit = true; // 取消节点的编辑操作
                MessageBox.Show("重命名失败!");
                return;
            }

            Computer MyComputer = new Computer();
            MyComputer.FileSystem.RenameFile(strFileName, strNewFile);
            trvSymbol.SelectedNode.Tag = strNewFileFull;
        }

        /// <summary>
        /// 鼠标点击，右键菜单
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void trvSymbol_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            Point point = new Point(e.X, e.Y);
            TreeNode treeNode = trvSymbol.GetNodeAt(point);
            if (treeNode == trvSymbol.Nodes[0])
            {
                return;
            }
            trvSymbol.SelectedNode = treeNode;
            if (e.Button == MouseButtons.Right)
            {
                if (treeNode.Text == CurrentFile)
                {
                    EnableRenameDeleteItems(false);
                }
                else
                {
                    EnableRenameDeleteItems(true);
                }

                //显示上下文菜单
                ctmTree.Show(trvSymbol.PointToScreen(point));
            }
        }

        private void EnableRenameDeleteItems(bool enabled)
        {
            ctmTree.Items.OfType<ToolStripMenuItem>()
                .Where(x => x.Text == "重命名" || x.Text == "删除")
                .ToList()
                .ForEach(x => x.Enabled = enabled);
        }

        private void tmiMerge_Click(object sender, EventArgs e)
        {
            if (trvSymbol.SelectedNode == null || string.IsNullOrWhiteSpace(SelectedFile))
            {
                return;
            }

            // 选择文件
            var dialog = new OpenFileDialog
            {
                Filter = "*.kev;*.dfd;*.pcg|*kev;*.dfd;*.pcg"
            };

            if (dialog.ShowDialog(this) != DialogResult.OK)
            {
                return;
            }

            // 合并符号
            MergeSymbol(dialog.FileName);

            // 刷新
            ShowSelectedSymbolGroup();
        }

        private void MergeSymbol(string mergeFile)
        {
            if (SelectedFile.Equals(CurrentFile))
            {
                MergeSymbol(DrawerGeo.GetDrawerXy(), mergeFile);
            }
            else
            {
                MergeSymbol(SelectedFile, mergeFile);
            }
        }

        private void MergeSymbol(string sourceFile, string mergeFile)
        {
            var drawerData = new DrawerData();
            if (drawerData.OpenFile(SelectedFile))
            {
                drawerData.MergeSymbol(mergeFile);
                drawerData.SaveAs(sourceFile);
                drawerData.Dispose();

                // FIXME: 符号库里面有缓存，这里需要重新加载一下，
                // 也许正确的方法应该是符号库去追踪文件变化，然后自动重新加载
                GeoSigmaLib.LibraryReloadGroup(sourceFile);
            }
        }

        private void MergeSymbol(IntPtr sourceXy, string mergeFile)
        {
            var drawerData = new DrawerData();
            drawerData.OpenXy(sourceXy);
            drawerData.MergeSymbol(mergeFile);
            drawerData.Dispose();
        }
    }

    public class SymbolItemData
    {
        public string Group { get; set; }
        public string Name { get; set; }
        public IntPtr PtrXY { get; set; }
    }
}