using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Text.RegularExpressions;

namespace GeoSigmaViewer
{
    public delegate void NodeSelected(string layerName);
    public partial class LayerTree : UserControl
    {
        public NodeSelected LayerSelectedEvent;
        public Viewer DrawViewer { get; set; }
             
        TreeNode currentNode = null;
        Font fontDefault;
        Font fontFocuse;
        bool allChecked = false;
        public int ID { get; set; }
        public LayerTree()
        {
            System.Security.Cryptography.RNGCryptoServiceProvider csp = new System.Security.Cryptography.RNGCryptoServiceProvider();
            byte[] byteCsp = new byte[10];
            csp.GetBytes(byteCsp);
            ID=BitConverter.ToInt32(byteCsp, 0);
            InitializeComponent();

            fontDefault=DefaultFont;
            fontFocuse=new Font("宋体", 9.0f, FontStyle.Bold|FontStyle.Underline);

            //treeView.ShowLines=false;
            //treeView.FullRowSelect=true;
        }
        private TreeNode FindNode(TreeNode tnParent, string strValue)
        {
            if (tnParent==null) return null;
            if (tnParent.FullPath==strValue) return tnParent;
            TreeNode tnRet = null;
            foreach (TreeNode tn in tnParent.Nodes)
            {
                tnRet=FindNode(tn, strValue);
                if (tnRet!=null) break;
            }
            return tnRet;
        }
        private void Expand2Node(TreeNode node)
        {
            TreeNode tnParent = node.Parent;
            if(tnParent !=null)
            {
                tnParent.Expand();
                Expand2Node(tnParent);
            }
        }
        public void SetCurrentLayer(string layerName)
        {
            TreeNode nodeFind = FindNode(treeView.Nodes[0], "图层\\"+layerName);
            if (nodeFind==null) return;

            if (currentNode!=null)
            {
                currentNode.NodeFont=fontDefault;
                currentNode.ForeColor=Color.Black;
            }

            currentNode=nodeFind;
            currentNode.NodeFont=fontFocuse;
            currentNode.ForeColor=Color.Red;

            treeView.SelectedNode=currentNode;

            Expand2Node(currentNode);
        }
        public void ResetLayers(string layers)
        {
            string[] saFullLayers = Regex.Split(layers, "\r\n");
            Array.Reverse(saFullLayers);
            treeView.Nodes.Clear();
            treeView.ImageList=imlLayer;
            TreeNode tnRoot = new TreeNode("图层");
            tnRoot.Name=tnRoot.Text;
            treeView.Nodes.Add(tnRoot);
            foreach (string strLine in saFullLayers)
            {
                if (strLine.Length==0) continue;
                string[] saLayers = Regex.Split(strLine, @"\\");
                FillLayerTree(tnRoot, saLayers, 0);
            }

            treeView.UpdateView();
            treeView.UnselectAll();
            tnRoot.Expand();
        }
        private void FillLayerTree(TreeNode tnRoot, string[] saLayers, int startIndex)
        {
            for (int i = startIndex; i<saLayers.Length; i++)
            {
                string strLayer = saLayers[i];
                if (strLayer.Equals("Layer:"))
                { continue; }
                int nFind = tnRoot.Nodes.IndexOfKey(strLayer);
                if (nFind<0)
                {
                    MakeFullNode(tnRoot, saLayers, i);
                    break;
                }
                else
                {
                    TreeNode tnFind = tnRoot.Nodes[nFind];
                    FillLayerTree(tnFind, saLayers, i+1);
                    break;
                }
            }
        }
        /// <summary>
        /// 生成节点及其子节点
        /// </summary>
        /// <param name="curNode"></param>
        /// <param name="nodeNames"></param>
        /// <param name="startIndex"></param>
        private void MakeFullNode(TreeNode curNode, string[] nodeNames, int startIndex)
        {
            if (startIndex<nodeNames.Length)
            {
                TreeNode tnChild = new TreeNode(nodeNames[startIndex]);
                tnChild.Name=tnChild.Text;
                tnChild.ImageIndex=0;
                curNode.Nodes.Add(tnChild);
                MakeFullNode(tnChild, nodeNames, startIndex+1);
            }
        }
        private void treeView_NodeMouseDoubleClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            ActiveNode(e.Node);
            //if (currentNode!=null)
            //{
            //    currentNode.NodeFont=fontDefault;
            //    currentNode.ForeColor=Color.Black;
            //}

            //currentNode=e.Node;
            //currentNode.NodeFont=fontFocuse;
            //currentNode.ForeColor=Color.Red;
            //string strLayerName = GetLayerName(e.Node);
            //if (String.IsNullOrWhiteSpace(strLayerName)) return;
            //DrawViewer.SetCurrentLayer(strLayerName);
        }
        private void ActiveNode(string layerName)
        {
            TreeNode nodeFind = FindNode(treeView.Nodes[0], "图层\\"+layerName);
            if (nodeFind==null) return;
            ActiveNode(nodeFind);
        }
        private void ActiveNode(TreeNode node)
        {
            if (currentNode!=null)
            {
                currentNode.NodeFont=fontDefault;
                currentNode.ForeColor=Color.Black;
            }

            currentNode=node;
            currentNode.NodeFont=fontFocuse;
            currentNode.ForeColor=Color.Red;
            treeView.SelectedNode=currentNode;

            string strLayerName = GetLayerName(node);
            if (String.IsNullOrWhiteSpace(strLayerName)) return;
            DrawViewer.SetCurrentLayer(strLayerName);
        }
        /// <summary>
        /// 可见可编辑
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbViewEdit_Click(object sender, EventArgs e)
        {
            if (treeView.Nodes.Count==0) return;
            LayerStatus status = LayerStatus.VIEW_EDIT;
            SetCheckedNodeStatus(treeView.Nodes[0], status);
            DrawViewer.Redraw();
        }
        private void tsbViewNotEdit_Click(object sender, EventArgs e)
        {
            if (treeView.Nodes.Count==0) return;
            LayerStatus status = LayerStatus.VIEW_NOT_EDIT;
            SetCheckedNodeStatus(treeView.Nodes[0], status);
            DrawViewer.Redraw();
        }

        private void tsbNotViewNotEdit_Click(object sender, EventArgs e)
        {
            if (treeView.Nodes.Count==0) return;
            LayerStatus status = LayerStatus.NOT_VIEW_NOT_EDIT;
            SetCheckedNodeStatus(treeView.Nodes[0], status);
            DrawViewer.Redraw();
        }
        /// <summary>
        /// 设置选中节点的状态
        /// </summary>
        /// <param name="node"></param>
        /// <param name="status"></param>
        private void SetCheckedNodeStatus(TreeNode node, LayerStatus status)
        {
            if (node==null) return;
            if (node.GetCheckStatus()==1)
            {
                string strLayer = GetLayerName(node);
                if (!String.IsNullOrWhiteSpace(strLayer))
                {
                    DrawViewer.SetLayerState(strLayer, status);
                    SetNodeStatus(node, status);
                }
            }
            foreach (TreeNode tn in node.Nodes)
            {
                SetCheckedNodeStatus(tn, status);
            }
        }
        /// <summary>
        /// 选中指定状态的节点
        /// </summary>
        /// <param name="node"></param>
        /// <param name="status"></param>
        private void CheckedNodeByStatus(TreeNode node, LayerStatus status)
        {
            if (node==null) return;
            if (status==GetNodestatus(node))
            {
                node.SetCheckStatus(1);
            }
            foreach (TreeNode tn in node.Nodes)
            {
                CheckedNodeByStatus(tn, status);
            }
        }
        /// <summary>
        /// 设置节点状态标识
        /// </summary>
        /// <param name="node"></param>
        /// <param name="status"></param>
        private void SetNodeStatus(TreeNode node, LayerStatus status)
        {
            if(status ==LayerStatus.VIEW_EDIT)
            {
                node.ImageIndex=0;
            }
            else if (status==LayerStatus.VIEW_NOT_EDIT)
            {
                node.ImageIndex=1;
            }
            else if (status==LayerStatus.NOT_VIEW_NOT_EDIT)
            {
                node.ImageIndex=2;
            }
            else
            {
                node.ImageIndex=0;
            }
        }
        private LayerStatus GetNodestatus(TreeNode node)
        {
            LayerStatus status=0;
            if (node.ImageIndex==0)
            {
                status=LayerStatus.VIEW_EDIT;
            }
            else if (node.ImageIndex==1)
            {
                status=LayerStatus.VIEW_NOT_EDIT;
            }
            else if (node.ImageIndex==2)
            {
                status=LayerStatus.NOT_VIEW_NOT_EDIT;
            }
            return status;
        }
        private string GetLayerName(TreeNode node)
        {
            string strLayerName = node.FullPath;
            if (strLayerName.Length<3)
                return null;
            strLayerName="Layer:\\"+strLayerName.Remove(0, 3);
            return strLayerName;
        }

        private void tsbCheckAll_Click(object sender, EventArgs e)
        {
            if (allChecked==false)
            { treeView.SelectAll(); }
            else
            {
                treeView.UnselectAll();
            }
            allChecked=!allChecked;
        }

        private void tsbCheckLock_Click(object sender, EventArgs e)
        {
            treeView.UnselectAll();
            CheckedNodeByStatus(treeView.Nodes[0], LayerStatus.VIEW_NOT_EDIT);
            treeView.UpdateView();
        }

        private void tsbCheckUnlock_Click(object sender, EventArgs e)
        {
            treeView.UnselectAll();
            CheckedNodeByStatus(treeView.Nodes[0], LayerStatus.VIEW_EDIT);
            treeView.UpdateView();
        }

        private void tsbCheckHide_Click(object sender, EventArgs e)
        {
            treeView.UnselectAll();
            CheckedNodeByStatus(treeView.Nodes[0], LayerStatus.NOT_VIEW_NOT_EDIT);
            treeView.UpdateView();
        }

        private void drpCheckAll_ButtonClick(object sender, EventArgs e)
        {
            tsbCheckAll_Click(sender, e);
        }

        private void tspAddChildNode_ButtonClick(object sender, EventArgs e)
        {
            TreeNode tnParent = treeView.SelectedNode;
            if (tnParent==null) return;
            int i = 1;
            string strNodeName = "新图层"+i;
            TreeNode[] nodes= tnParent.Nodes.Find(strNodeName, false);
            while (nodes!=null && nodes.Length>0)
            {
                i++;
                strNodeName ="新图层"+i;
                nodes=tnParent.Nodes.Find(strNodeName, false);
            }
            AddNewNode(tnParent, strNodeName);
        }

        private void tsbAddChildNode_Click(object sender, EventArgs e)
        {
            tspAddChildNode_ButtonClick(sender, e);
        }

        private void tsbAddNextNode_Click(object sender, EventArgs e)
        {
            if (treeView.SelectedNode==null) return;
            TreeNode tnParent = treeView.SelectedNode.Parent;
            if (tnParent==null) return;
            int i = 1;
            string strNodeName = "新图层"+i;
            TreeNode[] nodes = tnParent.Nodes.Find(strNodeName, false);
            while (nodes!=null&&nodes.Length>0)
            {
                i++;
                strNodeName="新图层"+i;
                nodes=tnParent.Nodes.Find(strNodeName, false);
            }
            AddNewNode(tnParent, strNodeName);
        }
        private void AddNewNode(TreeNode parentNode, string nodeName)
        {
            TreeNode tnNew = new TreeNode(nodeName);
            tnNew.Name=tnNew.Text;
            tnNew.ImageIndex=0;
            tnNew.SetCheckStatus(0);
            parentNode.Nodes.Add(tnNew);
            treeView.UpdateView();
            parentNode.Expand();
            //treeView.SelectedNode=tnNew;
            string strLayerName = GetLayerName(tnNew);
            DrawViewer.FindAddLayer(strLayerName, false);
            ActiveNode(tnNew);
        }
        /// <summary>
        /// 删除选中图层
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tspDeleteLayer_ButtonClick(object sender, EventArgs e)
        {
            //TreeNode node = treeView.SelectedNode;
            // if (node==null) return;
            List<TreeNode> lstNodes = new List<TreeNode>();
            GetNodeByCheckStatus(treeView.Nodes[0], 1, lstNodes);
            List<string> lstLayers = new List<string>();
            foreach(TreeNode node in lstNodes)
            {
                GetLayersWithChild(node, lstLayers);
            }
            DrawViewer.DeleteLayer(lstLayers);
            foreach (TreeNode node in lstNodes)
            {
                node.Remove();
            }
            treeView.UpdateView();
            DrawViewer.Redraw();

            string strCurLayer = DrawViewer.GetCurrentLayer();
            ActiveNode(strCurLayer);            
        }
        private void GetNodeByCheckStatus(TreeNode node,  int checkStatus, List<TreeNode> nodes)
        {
            if (node==null) return;
            if (node.GetCheckStatus()==(int)checkStatus)
            {
                nodes.Insert(0, node);
            }
            foreach (TreeNode tn in node.Nodes)
            {
                GetNodeByCheckStatus(tn, checkStatus, nodes);
            }
        }

        private void GetLayersWithChild(TreeNode node, List<string> layerNames)
        {
            if (node==null) return;
            string strLayerName = GetLayerName(node);
            if(!layerNames.Contains(strLayerName))
                layerNames.Add(strLayerName);
            foreach (TreeNode tn in node.Nodes)
            {
                GetLayersWithChild(tn, layerNames);
            }
        }
        /// <summary>
        /// 反选
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tsbCheckReverse_Click(object sender, EventArgs e)
        {
            treeView.AntiSelect();
        }

        private void treeView_AfterSelect(object sender, TreeViewEventArgs e)
        {
            string strName = GetLayerName(e.Node);
            LayerSelectedEvent?.Invoke(strName);
            //MessageBox.Show(strName);
        }
    }
}