using bzit.bomg;
using bzit.bomg.Data;
using bzit.bomg.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Text;
using System.Windows.Forms;
using Resources = bzit.bomg.Properties.Resources;

namespace RyzStudio.Windows.Forms
{
    public class BookmarkTreeView : System.Windows.Forms.TreeView
    {
        public enum IconSet
        {
            Root = 0,
            Folder1,
            Folder2,
            Default
        }

        public enum NodeType
        {
            None = 0,
            Root,
            Folder,
            Page
        }

        public BookmarkTreeViewSNode SNode { get; set; }

        protected IconDatabase iconDatabase = null;

        protected TreeNode draggingNode = null;
        protected bool allowBeginEdit = false;
        protected bool hasChanged = false;

        public BookmarkTreeView() : base()
        {
            this.SNode = new BookmarkTreeViewSNode(this);

            if (this.ImageList == null)
            {
                this.ImageList = new ImageList();
            }

            this.ImageList.ColorDepth = ColorDepth.Depth16Bit;
            this.ImageList.ImageSize = new Size(16, 16);
            this.ImageList.TransparentColor = Color.Transparent;

            this.ImageList.Images.Clear();
            this.ImageList.Images.Add(Resources.hexagon);
            this.ImageList.Images.Add(Resources.folder);
            this.ImageList.Images.Add(Resources.folder_explore);
            this.ImageList.Images.Add(Resources.file_text);

            this.PathSeparator = "\n";
        }

        [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public new ImageList ImageList { get => base.ImageList; set => base.ImageList = value; }

        [Browsable(false)]
        public bool HasChanged
        {
            get { return hasChanged; }
            set
            {
                hasChanged = value;

                //OnChanged?.Invoke(null, null);
            }
        }


        #region public methods

        public bool InitialiseIconDatabase(out string message, string filename)
        {
            message = string.Empty;

            if (string.IsNullOrWhiteSpace(filename))
            {
                return false;
            }

            if (iconDatabase == null)
            {
                iconDatabase = new IconDatabase();
            }

            bool rv = false;
            if (File.Exists(filename))
            {
                rv = iconDatabase.LoadFile(filename);
                if (!rv)
                {
                    rv = iconDatabase.Create(filename, true, null, true);
                    if (!rv)
                    {
                        message = iconDatabase.LastError;
                        return false;
                    }
                }
            }
            else
            {
                rv = iconDatabase.Create(filename, true, null, true);
                if (!rv)
                {
                    message = iconDatabase.LastError;
                    return false;
                }
            }

            return true;
        }

        public TreeNode AddFolder(TreeNode node)
        {
            //return this.AddFolder("New Folder " + (new Random()).Next(10001, 99999).ToString());
            return this.AddFolder(node, "New Folder (" + DateTime.Now.ToString("yyyy-MM-dd-HHmmss") + ")");
        }

        public TreeNode AddFolder(TreeNode node, string name)
        {
            if (node == null)
            {
                return null;
            }

            if (node.Tag != null)
            {
                return null;
            }

            return node.Nodes.Add(encodePath(name), name, (int)IconSet.Folder1, (int)IconSet.Folder2);
        }

        public void AddItem(List<BookmarkItemViewModel> viewModelList)
        {
            this.Clear();

            if (viewModelList == null)
            {
                return;
            }

            foreach (BookmarkItemViewModel item in viewModelList)
            {
                AddItem(item);
            }
        }

        public void AddItem(BookmarkItemViewModel viewModel)
        {
            int iconIndex = addIcon(viewModel);

            TreeNode tn = new TreeNode(viewModel.SiteName, iconIndex, iconIndex);
            tn.Tag = viewModel;
            tn.ToolTipText = viewModel.ToString();

            TreeNode tn2 = addFolderPath(viewModel.TreeviewPath);

            tn2.Nodes.Add(tn);

            this.HasChanged = true;
        }

        public void AddOrUpdateItem_OnSelectedNode(BookmarkItemViewModel viewModel)
        {
            switch (this.SNode.GetNodeType())
            {
                case NodeType.Root:
                case NodeType.Folder:
                    addItem_OnSelectedNode(viewModel);

                    this.HasChanged = true;
                    break;
                case NodeType.Page:
                    updateItem_OnSelectedNode(viewModel);

                    this.HasChanged = true;
                    break;
                default:
                    break;
            }
        }

        public void Clear()
        {
            this.Nodes.Clear();

            this.HasChanged = true;
        }

        public void Clear(string name)
        {
            this.Nodes.Clear();
            this.Nodes.Add("", name?.Trim(), (int)IconSet.Root, (int)IconSet.Root);

            this.HasChanged = true;
        }

        public void CloseIconDatabase()
        {
            iconDatabase.Close();
        }

        public NodeType GetNodeType(TreeNode node)
        {
            if (node.Tag == null)
            {
                if (node.Equals(this.Nodes[0]))
                {
                    return NodeType.Root;
                }
                else
                {
                    return NodeType.Folder;
                }
            }
            else
            {
                if (node.Tag is BookmarkItemViewModel)
                {
                    return NodeType.Page;
                }
                else
                {
                    return NodeType.None;
                }
            }
        }

        public string GetNodePath(TreeNode node)
        {
            string[] folderList = node.FullPath.Split('\n');
            if (folderList.Length < 2)
            {
                return null;
            }

            //if (folderList.Length < 2)
            //{
            //    return "/";
            //}

            StringBuilder sb = new StringBuilder();

            for (int i=0; i<(folderList.Length - 1); i++)
            {
                sb.Append("\\");
                sb.Append(encodePath(folderList[i] ?? string.Empty));
            }

            sb.Append("\\");

            return sb.ToString();
        }

        public BookmarkItemViewModel GetViewModel(TreeNode node) => (BookmarkItemViewModel)node.Tag;

        public List<BookmarkItemViewModel> GetBookmarkList()
        {
            List<BookmarkItemViewModel> rs = new List<BookmarkItemViewModel>();

            if (this.Nodes.Count <= 0)
            {
                return rs;
            }

            foreach (TreeNode item in this.Nodes)
            {
                traverseBookmarkList(rs, item);
            }

            return rs;
        }

        public bool FindTextNode(TreeNode node, string term)
        {
            if (node == null)
            {
                return false;
            }

            if (this.Nodes.Count <= 0)
            {
                return false;
            }

            bool rt = false;
            bool inclusive = false;
            TreeNode tn = node;
            while (true)
            {
                if (tn == null)
                {
                    break;
                }

                if (inclusive)
                {
                    if (tn.Text.ToLower().Contains(term.ToLower()))
                    {
                        this.SelectedNode = tn;
                        this.SelectedNode.EnsureVisible();
                        rt = true;
                        break;
                    }
                }

                if (tn.Nodes.Count > 0)
                {
                    tn = tn.Nodes[0];
                    inclusive = true;
                }
                else
                {
                    if (tn.NextNode != null)
                    {
                        tn = tn.NextNode;
                        inclusive = true;
                    }
                    else
                    {
                        while (true)
                        {
                            tn = tn.Parent;
                            if (tn == null)
                            {
                                break;
                            }

                            if (tn.NextNode != null)
                            {
                                tn = tn.NextNode;
                                break;
                            }
                        }

                        inclusive = true;
                    }
                }
            }

            return rt;
        }

        #endregion

        #region integrated behaviour

        protected override void OnItemDrag(ItemDragEventArgs e)
        {
            base.OnItemDrag(e);

            draggingNode = (TreeNode)e.Item;
            DoDragDrop(e.Item, DragDropEffects.Move);
        }

        protected override void OnDragDrop(DragEventArgs e)
        {
            base.OnDragDrop(e);

            if (draggingNode.Level <= 0)
            {
                return;
            }

            TreeNode en = this.GetNodeAt(this.PointToClient(new Point(e.X, e.Y)));
            if (en == null)
            {
                return;
            }

            if (isNodeChild(draggingNode, en))
            {
                return;
            }

            TreeNode dn = draggingNode;
            if (en.Tag == null)
            {
                dn.Parent.Nodes.Remove(dn);
                en.Nodes.Insert(0, dn);
            }
            else
            {
                en.Parent.Nodes.Remove(dn);
                en.Parent.Nodes.Insert(en.Index + 1, dn);
            }

            this.HasChanged = true;
        }

        protected override void OnDragEnter(DragEventArgs e)
        {
            base.OnDragEnter(e);

            e.Effect = DragDropEffects.Move;
        }

        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);

            this.SelectedNode = this.GetNodeAt(e.Location);
        }

        protected override void OnDragOver(DragEventArgs e)
        {
            base.OnDragOver(e);

            this.SelectedNode = this.GetNodeAt(this.PointToClient(new Point(e.X, e.Y)));
        }

        protected override void OnBeforeLabelEdit(NodeLabelEditEventArgs e)
        {
            if (!allowBeginEdit)
            {
                allowBeginEdit = false;

                e.CancelEdit = true;
                return;
            }

            this.HasChanged = true;

            base.OnBeforeLabelEdit(e);
        }

        protected override void OnAfterLabelEdit(NodeLabelEditEventArgs e)
        {
            base.OnAfterLabelEdit(e);

            //if (e.Node.Tag == null)
            //{
            //    if (e.Label == null)
            //    {
            //        e.CancelEdit = true;
            //    }
            //    else
            //    {
            //        if (e.Label.Trim().Length <= 0)
            //        {
            //            e.CancelEdit = true;
            //        }
            //    }
            //}
            //else
            //{
            //    e.CancelEdit = true;
            //}

            allowBeginEdit = false;
        }

        protected override void OnPreviewKeyDown(PreviewKeyDownEventArgs e)
        {
            TreeNode tn = this.SelectedNode;
            if (tn == null)
            {
                return;
            }

            NodeType nodeType = this.SNode.GetNodeType();

            switch (e.KeyCode)
            {
                case Keys.Insert:
                    if (e.Modifiers == Keys.Shift)
                    {
                        if ((nodeType == NodeType.Root) || (nodeType == NodeType.Folder))
                        {
                            this.SelectedNode = this.SNode.AddFolder();
                        }
                        else if (nodeType == NodeType.Page)
                        {
                            this.SelectedNode = tn.Parent;
                            this.SelectedNode = this.SNode.AddFolder();
                        }
                    }

                    break;
                case Keys.Delete:
                    if (!tn.IsEditing)
                    {
                        this.SNode.Delete();
                    }

                    break;
                case Keys.F2:
                    allowBeginEdit = true;

                    this.SNode.Edit();
                    break;
                case Keys.F3:
                    switch (nodeType)
                    {
                        case NodeType.Root:
                        case NodeType.Folder:
                            try
                            {
                                Clipboard.SetText(tn.Text ?? string.Empty);
                            }
                            catch
                            {
                            }

                            break;
                        case NodeType.Page:
                            BookmarkItemViewModel viewModel = this.SNode.GetViewModel();
                            if (viewModel != null)
                            {
                                try
                                {
                                    Clipboard.SetText(viewModel.SiteAddress ?? string.Empty);
                                }
                                catch
                                {
                                }
                            }

                            break;
                        default:
                            break;
                    }

                    break;
                case Keys.Up:
                    if (e.Modifiers == Keys.Control)
                    {
                        this.SNode.MoveUp();
                    }

                    break;
                case Keys.Down:
                    if (e.Modifiers == Keys.Control)
                    {
                        this.SNode.MoveDown();
                    }

                    break;
                default: break;
            }

            base.OnPreviewKeyDown(e);
        }

        #endregion

        protected int addIcon(BookmarkItemViewModel viewModel) => addIcon(viewModel.ToModel());

        protected int addIcon(BookmarkItemModel model)
        {
            if (this.ImageList.Images.ContainsKey(model.SiteAddress))
            {
                return this.ImageList.Images.IndexOfKey(model.SiteAddress);
            }

            if (iconDatabase.HasIcon(model.SiteAddress))
            {
                Image rs = iconDatabase.GetIcon(model.SiteAddress);
                if (rs == null)
                {
                    return (int)IconSet.Default;
                }
                else
                {
                    this.ImageList.Images.Add(model.SiteAddress, rs);

                    return this.ImageList.Images.IndexOfKey(model.SiteAddress);
                }
            }

            Bitmap bmp = model.RetrieveFavicon();
            if (bmp == null)
            {
                return (int)IconSet.Default;
            }

            this.ImageList.Images.Add(model.SiteAddress, bmp);

            return this.ImageList.Images.IndexOfKey(model.SiteAddress);
        }

        protected TreeNode addFolderPath(string path)
        {
            TreeNode tn = null;
            //TreeNode tn = this.Nodes[0];
            //if (tn == null)
            //{
            //    return tn;
            //}

            if (string.IsNullOrWhiteSpace(path))
            {
                return tn;
            }

            if (string.IsNullOrWhiteSpace(path.Trim('\\')))
            {
                return tn;
            }

            string[] folderList = path.Trim('\\').Split('\\');
            if (folderList.Length <= 0)
            {
                return tn;
            }

            for (int i=0; i<folderList.Length; i++)
            {
                string item = folderList[i];

                if (i <= 0)
                {
                    if (!this.Nodes.ContainsKey(item))
                    {
                        this.Nodes.Add(item, decodePath(item), (int)IconSet.Root, (int)IconSet.Root);
                    }

                    tn = this.Nodes[item];
                }
                else
                {
                    if (!tn.Nodes.ContainsKey(item))
                    {
                        tn.Nodes.Add(item, decodePath(item), (int)IconSet.Folder1, (int)IconSet.Folder2);
                    }

                    tn = tn.Nodes[item];
                }
            }

            return tn;
        }

        protected void addItem_OnSelectedNode(BookmarkItemViewModel viewModel)
        {
            if (this.SelectedNode == null)
            {
                return;
            }

            int iconIndex = addIcon(viewModel);

            TreeNode tn = new TreeNode(viewModel.SiteName, iconIndex, iconIndex);
            tn.Tag = viewModel;
            tn.ToolTipText = viewModel.ToString();

            int n = this.SelectedNode.Nodes.Add(tn);

            this.SelectedNode = this.SelectedNode.Nodes[n];
        }

        protected string decodePath(string value) => System.Web.HttpUtility.UrlDecode(value);

        protected string encodePath(string value) => System.Web.HttpUtility.UrlEncode(value);

        protected void traverseBookmarkList(List<BookmarkItemViewModel> rs, TreeNode node)
        {
            foreach (TreeNode tn in node.Nodes)
            {
                NodeType nodeType = this.GetNodeType(tn);
                if (nodeType == NodeType.Folder)
                {
                    traverseBookmarkList(rs, tn);
                }
                else if (nodeType == NodeType.Page)
                {
                    BookmarkItemViewModel nodeTag = this.GetViewModel(tn);
                    nodeTag.TreeviewPath = this.GetNodePath(tn);

                    if (nodeTag != null)
                    {
                        rs.Add(nodeTag);
                    }
                }
            }
        }

        protected void updateItem_OnSelectedNode(BookmarkItemViewModel viewModel)
        {
            if (this.SelectedNode == null)
            {
                return;
            }

            int iconIndex = addIcon(viewModel);

            this.SelectedNode.Text = viewModel.SiteName;
            this.SelectedNode.ImageIndex = iconIndex;
            this.SelectedNode.SelectedImageIndex = iconIndex;
            this.SelectedNode.Tag = viewModel;
            this.SelectedNode.ToolTipText = viewModel.ToString();
        }

        protected bool isNodeChild(TreeNode drag_node, TreeNode drop_node)
        {
            TreeNode tn = drop_node;
            while (true)
            {
                if (tn.Parent == null)
                {
                    break;
                }

                if (tn.Equals(drag_node))
                {
                    return true;
                }

                tn = tn.Parent;
            }

            return false;
        }

    }
}