using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using AIStudio.Wpf.DiagramDesigner;
using AIStudio.Wpf.DiagramDesigner.Algorithms;
using AIStudio.Wpf.DiagramDesigner.Geometrys;
using AIStudio.Wpf.DiagramDesigner.Helpers;
using AIStudio.Wpf.DiagramDesigner.Models;
using AIStudio.Wpf.Mind.Helpers;

namespace AIStudio.Wpf.Mind.ViewModels
{
    public class MindNode : DesignerItemViewModelBase
    {
        public MindNode(NodeLevel nodeLevel, MindType mindType = MindType.Mind) : this(null, nodeLevel, mindType)
        {
        }

        public MindNode(IDiagramViewModel root, NodeLevel nodeLevel, MindType mindType = MindType.Mind) : base(root)
        {
            NodeLevel = nodeLevel;
            MindType = mindType;        

            InitLayout();
            MindLayout.Appearance(this);
        }

        public MindNode(IDiagramViewModel root, SelectableItemBase designer) : base(root, designer)
        {
            InitLayout();
        }

        public MindNode(IDiagramViewModel root, SerializableItem serializableItem, string serializableType) : base(root, serializableItem, serializableType)
        {
            InitLayout();
        }

        protected override void Init(IDiagramViewModel root)
        {
            base.Init(root);

            EnabledForConnection = false;

            AddChildCommand = new SimpleCommand(Command_Enable, ExecuteAddChildCommand);
            AddParentCommand = new SimpleCommand(Level_Enable, ExecuteAddParentCommand);
            AddPeerCommand = new SimpleCommand(Level_Enable, ExecuteAddPeerCommand);
            DeleteCommand = new SimpleCommand(Level_Enable, ExecuteDeleteCommand);
            MoveForwardCommand = new SimpleCommand(Command_Enable, ExecuteMoveForwardCommand);
            MoveBackCommand = new SimpleCommand(Command_Enable, ExecuteMoveBackCommand);
            BuildMenuOptions();
    
            this.PropertyChanged += this.Item_PropertyChanged;
        }

        protected void InitLayout()
        {
            var layout = GlobalType.AllTypes.Where(p => typeof(IMindLayout).IsAssignableFrom(p)).FirstOrDefault(p => p.Name == MindType.ToString() + "Layout");
            MindLayout = layout != null ? (System.Activator.CreateInstance(layout) as IMindLayout) : new MindLayout();
        }


        private bool Level_Enable(object obj)
        {
            if (Command_Enable(obj) == false) return false;

            return NodeLevel != NodeLevel.Level1;
        }

        #region 属性
        public IMindLayout MindLayout
        {
            get;set;
        }
        [Browsable(false)]
        private NodeLevel _nodeLevel;
        public NodeLevel NodeLevel
        {
            get
            {
                return _nodeLevel;
            }
            set
            {
                SetProperty(ref _nodeLevel, value);
            }
        }

        private MindType _mindType;
        public MindType MindType
        {
            get
            {
                return _mindType;
            }
            set
            {
                SetProperty(ref _mindType, value);
            }
        }

        private CornerRadius _cornerRadius = new CornerRadius(3);
        public CornerRadius CornerRadius
        {
            get
            {
                return _cornerRadius;
            }
            set
            {
                SetProperty(ref _cornerRadius, value);
            }
        }

        private Thickness _borderThickness = new Thickness(1);
        public Thickness BorderThickness
        {
            get
            {
                return _borderThickness;
            }
            set
            {
                SetProperty(ref _borderThickness, value);
            }
        }

        private bool _isExpanded = true;
        public bool IsExpanded
        {
            get
            {
                return _isExpanded;
            }
            set
            {
                SetProperty(ref _isExpanded, value);
            }
        }

        public SizeBase Spacing
        {
            get; set;
        } = new SizeBase(15, 15);


        private ObservableCollection<MindNode> _children = new ObservableCollection<MindNode>();
        public ObservableCollection<MindNode> Children
        {
            get
            {
                return _children;
            }
            set
            {
                SetProperty(ref _children, value);
            }
        }

        public SizeBase SizeWithSpacing
        {
            get
            {
                return this.Size.Add(Spacing.Width * 2, Spacing.Height * 2);
            }
        }

        public SizeBase DesiredSize
        {
            get; set;
        }

        public PointBase DesiredPosition
        {
            get; set;
        }

        public PointBase Offset
        {
            get; set;
        }

        private ConnectorOrientation _connectorOrientation = ConnectorOrientation.Left;
        public ConnectorOrientation ConnectorOrientation
        {
            get
            {
                return _connectorOrientation;
            }
            set
            {
                SetProperty(ref _connectorOrientation, value);
            }
        }

        public bool LayoutUpdating
        {
            get;set;
        }
        #endregion

        #region 附加信息属性
        private LinkInfo _linkInfo;
        public LinkInfo LinkInfo
        {
            get
            {
                return _linkInfo;
            }
            set
            {
                SetProperty(ref _linkInfo, value);
            }
        }

        private ImageInfo _imageInfo;
        public ImageInfo ImageInfo
        {
            get
            {
                return _imageInfo;
            }
            set
            {
                SetProperty(ref _imageInfo, value);
            }
        }

        private string _remark;
        public string Remark
        {
            get
            {
                return _remark;
            }
            set
            {
                SetProperty(ref _remark, value);
            }
        }

        private string _grade;
        public string Grade
        {
            get
            {
                return _grade;
            }
            set
            {
                SetProperty(ref _grade, value);
            }
        }

        private double _completionRate;
        public double CompletionRate
        {
            get
            {
                return _completionRate;
            }
            set
            {
                SetProperty(ref _completionRate, value);
            }
        }

        private ObservableCollection<string> _tags;
        public ObservableCollection<string> Tags
        {
            get
            {
                return _tags;
            }
            set
            {
                SetProperty(ref _tags, value);
            }
        }
        #endregion

        #region 命令
        public SimpleCommand AddParentCommand
        {
            get; private set;
        }

        public SimpleCommand AddChildCommand
        {
            get; private set;
        }

        public SimpleCommand AddPeerCommand
        {
            get; private set;
        }

        public SimpleCommand DeleteCommand
        {
            get; private set;
        }

        public SimpleCommand MoveForwardCommand
        {
            get; private set;
        }

        public SimpleCommand MoveBackCommand
        {
            get; private set;
        }
        #endregion

        #region 菜单
        private void BuildMenuOptions()
        {
            menuOptions = new ObservableCollection<CinchMenuItem>();
            CinchMenuItem menuItem = new CinchMenuItem();
            menuItem.Text = "下级";
            menuItem.Command = AddChildCommand;
            menuOptions.Add(menuItem);
            menuItem = new CinchMenuItem();
            menuItem.Text = "同级";
            menuItem.Command = AddPeerCommand;
            menuOptions.Add(menuItem);
            menuItem = new CinchMenuItem();
            menuItem.Text = "上级";
            menuItem.Command = AddParentCommand;
            menuOptions.Add(menuItem);
            menuItem = new CinchMenuItem();
            menuItem.Text = "前移";
            menuItem.Command = MoveForwardCommand;
            menuOptions.Add(menuItem);
            menuItem = new CinchMenuItem();
            menuItem.Text = "后移";
            menuItem.Command = MoveBackCommand;
            menuOptions.Add(menuItem);
            menuItem = new CinchMenuItem();
            menuItem.Text = "删除";
            menuItem.Command = DeleteCommand;
            menuOptions.Add(menuItem);
        }
        #endregion

        #region 操作
        public void ExecuteAddChildCommand(object obj)
        {
            if (obj is MindNode node)
            {
            }
            else
            {
                node = new MindNode(Root, NodeLevel + 1, this.MindType) { Text = "分支主题" };             
            }
            AddChild(node);

            LayoutUpdated();
        }

        public void ExecuteAddParentCommand(object obj)
        {
            if (Parent is MindNode parent)
            {
                if (obj is MindNode node)
                {
                }
                else
                {
                    if (NodeLevel == NodeLevel.Level1)
                    {
                        return;
                    }
                    else if (NodeLevel == NodeLevel.Level2)
                        node = new MindNode(Root, NodeLevel.Level2, this.MindType) { Text = "分支主题" };
                    else
                        node = new MindNode(Root, NodeLevel.Level3, this.MindType) { Text = "分支主题" };
                }

                parent.RemoveChild(this);
                int index = parent.Children.IndexOf(this);
                parent.AddChild(node, index + 1);

                node.AddChild(this);

                LayoutUpdated();
            }
        }

        public void ExecuteAddPeerCommand(object obj)
        {
            if (Parent is MindNode parent)
            {
                if (obj is MindNode node)
                {
                }
                else
                {
                    if (NodeLevel == NodeLevel.Level1)
                    {
                        return;
                    }
                    else if (NodeLevel == NodeLevel.Level2)
                        node = new MindNode(Root, NodeLevel.Level2, this.MindType) { Text = "分支主题" };
                    else
                        node = new MindNode(Root, NodeLevel.Level3, this.MindType) { Text = "分支主题" };
                }
                int index = parent.Children.IndexOf(this);
                parent.AddChild(node, index + 1);

                LayoutUpdated();
            }
        }

        private void ExecuteMoveBackCommand(object obj)
        {
            if (Parent is MindNode parent)
            {
                int index = parent.Children.IndexOf(this);
                if (index < parent.Children.Count - 1)
                {
                    parent.RemoveChild(this);
                    parent.AddChild(this, index + 1);
                    LayoutUpdated();
                }
            }
        }

        private void ExecuteMoveForwardCommand(object obj)
        {
            if (Parent is MindNode parent)
            {
                int index = parent.Children.IndexOf(this);
                if (index > 0)
                {
                    parent.RemoveChild(this);
                    parent.AddChild(this, index - 1);
                    LayoutUpdated();
                }
            }
        }

        private void ExecuteDeleteCommand(object obj)
        {
            if (Parent is MindNode parent)
            {
                parent.RemoveChild(this, true);
                LayoutUpdated();
            }
        }

        public void AddChild(MindNode item, int index = -1)
        {
            if (this.NodeLevel == NodeLevel.Level1)
            {
                item.NodeLevel = NodeLevel.Level2;
            }
            else
            {
                item.NodeLevel = NodeLevel.Level3;
            }
            if (index >= 0)
            {
                this.Children.Insert(index, item);
            }
            else
            {
                this.Children.Add(item);
            }
            item.Parent = this;
            Root?.DirectAddItemCommand.Execute(item);

            ConnectionViewModel connector = MindLayout?.GetConnectionViewModel(this, item);
            Root?.DirectAddItemCommand.Execute(connector);
            Root?.ClearSelectedItemsCommand.Execute(new SelectableDesignerItemViewModelBase[] { connector });

            Root?.BringForwardCommand.Execute(new DesignerItemViewModelBase[] { item });
        }

        public void RemoveChild(MindNode item, bool removeall = false)
        {
            item.PropertyChanged -= Item_PropertyChanged;

            this.Children.Remove(item);

            var connectors = Root?.Items.OfType<ConnectionViewModel>().Where(p => p.SinkConnectorInfoFully?.DataItem == item).ToList();

            Root?.DirectRemoveItemCommand.Execute(item);
            Root?.DirectRemoveItemCommand.Execute(connectors);

            if (removeall)
            {
                if (item.Children?.Count > 0)
                {
                    foreach (var child in item.Children.ToList())
                    {
                        item.RemoveChild(child);
                    }
                }
            }
        }
        #endregion

        private void Item_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (GetLevel1Node()?.LayoutUpdating == true) return;

            switch (e.PropertyName)
            {
                case nameof(IsExpanded):
                case nameof(ItemWidth):
                case nameof(ItemHeight):
                    {
                        LayoutUpdated();
                        break;
                    }
                case nameof(NodeLevel):
                    MindLayout?.Appearance(this);
                    break;
                //case nameof(MindType):
                //    if (NodeLevel == NodeLevel.Level1)
                //    {
                //        MindLayout?.Appearance(this);
                //        LayoutUpdated();
                //    }
                //    else
                //    {
                //        GetLevel1Node().MindType = MindType;
                //    }
                //    break;      
                case nameof(Left):
                    {
                        if (e is ValuePropertyChangedEventArgs valuePropertyChangedEventArgs)
                        {
                            if (NodeLevel == NodeLevel.Level1)
                            {
                                LayoutUpdated();
                            }
                            else
                            {
                                UpdateOffsetX((double)valuePropertyChangedEventArgs.OldValue, (double)valuePropertyChangedEventArgs.NewValue);
                                LayoutUpdated();
                            }
                        }
                        break;
                    }
                case nameof(Top):
                    {
                        if (e is ValuePropertyChangedEventArgs valuePropertyChangedEventArgs)
                        {
                            if (NodeLevel == NodeLevel.Level1)
                            {
                                LayoutUpdated();
                            }
                            else
                            {
                                UpdateOffsetY((double)valuePropertyChangedEventArgs.OldValue, (double)valuePropertyChangedEventArgs.NewValue);
                                LayoutUpdated();
                            }
                        }
                        break;
                    }
                case nameof(Text):
                    {
                        ItemWidth = Math.Max(ItemWidth, GetTextDisplayWidthHelper.GetTextDisplayWidth(Text, new FontFamily(FontViewModel.FontFamily), FontViewModel.FontStyle, FontViewModel.FontWeight, FontViewModel.FontStretch, FontViewModel.FontSize) + 30);
                        break;
                    }

            }
        }

        #region 布局相关
        public MindNode GetLevel1Node()
        {
            var node = this;
            while (node.Parent is MindNode mindNode)
            {
                node = mindNode;
            }
            return node;
        }

        public MindNode GetLevel2Node()
        {
            var node = this;
            while (node.Parent is MindNode mindNode && mindNode.NodeLevel == NodeLevel.Level2)
            {
                node = mindNode;
            }
            return node;
        }

        protected void UpdateOffsetX(double oldvalue, double newvalue)
        {
            Offset += new VectorBase(newvalue - oldvalue, 0);
        }

        protected void UpdateOffsetY(double oldvalue, double newvalue)
        {
            Offset += new VectorBase(0, newvalue - oldvalue);
        }

        public void LayoutUpdated()
        {
            MindLayout?.LayoutUpdated(GetLevel1Node());
        }

        #endregion
    }
     
    public class LinkInfo : BindableBase
    {
        private string _url;
        public string Url
        {
            get
            {
                return _url;
            }
            set
            {
                SetProperty(ref _url, value);
            }
        }

        private string _text;
        public string Text
        {
            get
            {
                return _text;
            }
            set
            {
                SetProperty(ref _text, value);
            }
        }
    }

    public class ImageInfo : BindableBase
    {
        private string _url;
        public string Url
        {
            get
            {
                return _url;
            }
            set
            {
                SetProperty(ref _url, value);
            }
        }

        private string _text;
        public string Text
        {
            get
            {
                return _text;
            }
            set
            {
                SetProperty(ref _text, value);
            }
        }
    }
}