using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using AIStudio.Wpf.DiagramDesigner;
using AIStudio.Wpf.Flowchart.Models;
using AIStudio.Wpf.Flowchart.ViewModels;

namespace AIStudio.Wpf.Flowchart.Controls
{
    /// <summary>
    /// FlowchartEditor.xaml 的交互逻辑
    /// </summary>
    [TemplatePart(Name = PART_DiagramControl, Type = typeof(DiagramControl))]
    public partial class FlowchartEditor : UserControl
    {
        public const string PART_DiagramControl = "PART_DiagramControl";
        private DiagramControl _diagramControl;
        private IDiagramServiceProvider _service
        {
            get
            {
                return DiagramServicesProvider.Instance.Provider;
            }
        }

        private DiagramViewModel _diagramViewModel = new DiagramViewModel()
        {
            ShowGrid = true,
            GridCellSize = new Size(100, 60),
            GridMargin = 0d,
            CellHorizontalAlignment = CellHorizontalAlignment.Center,
            CellVerticalAlignment = CellVerticalAlignment.Center,
            PageSizeType = PageSizeType.Custom,
            PageSize = new Size(double.NaN, double.NaN),
        };

        static FlowchartEditor()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(FlowchartEditor), new FrameworkPropertyMetadata(typeof(FlowchartEditor)));
        }

        public FlowchartEditor()
        {         
            _diagramViewModel.PropertyChanged += DiagramViewModel_PropertyChanged;
        }

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            _diagramControl = GetTemplateChild(PART_DiagramControl) as DiagramControl;
            _diagramControl.HorizontalAlignment = HorizontalAlignment.Stretch;
            _diagramControl.VerticalAlignment = VerticalAlignment.Stretch;
            _diagramControl.DataContext = _diagramViewModel;
        }

        private void DiagramViewModel_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "IsSelected")
            {
                SelectedObject = _diagramViewModel.SelectedItems?.FirstOrDefault();
            }
        }

        //一点要绑定不为空的FlowchartModel才能用，即便为空的也要new一个再来绑定
        public static readonly DependencyProperty FlowchartModelProperty =
          DependencyProperty.Register(nameof(FlowchartModel),
                                     typeof(FlowchartModel),
                                     typeof(FlowchartEditor),
                                     new FrameworkPropertyMetadata(null, OnFlowchartModelChanged));

        public FlowchartModel FlowchartModel
        {
            get
            {
                return (FlowchartModel)GetValue(FlowchartModelProperty);
            }
            set
            {
                SetValue(FlowchartModelProperty, value);
            }
        }
        private static void OnFlowchartModelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var view = d as FlowchartEditor;
            var model = e.NewValue as FlowchartModel;
            if (model != null)
            {
                view.CreateFlowchartModel(model);
            }
        }

        private void CreateFlowchartModel(FlowchartModel model)
        {
            _service.DrawModeViewModel.VectorLineDrawMode = DrawMode.BoundaryConnectingLine;
            _diagramViewModel.Items.Clear();
            if (model != null)
            {
                foreach (var node in model.Nodes)
                {
                    _diagramViewModel.DirectAddItemCommand.Execute(node);
                }
                foreach (var link in model.Links)
                {
                    _diagramViewModel.DirectAddItemCommand.Execute(link);
                }
            }
        }

        #region ToolBox
        /// <summary>
        /// 附加组件模板
        /// </summary>
        public static readonly DependencyProperty ToolBoxProperty = DependencyProperty.Register(
            nameof(ToolBox), typeof(ControlTemplate), typeof(FlowchartEditor), new FrameworkPropertyMetadata(default(ControlTemplate)));

        public ControlTemplate ToolBox
        {
            get
            {
                return (ControlTemplate)GetValue(ToolBoxProperty);
            }
            set
            {
                SetValue(ToolBoxProperty, value);
            }
        }
        #endregion

        #region ToolBox
        /// <summary>
        /// 附加组件模板
        /// </summary>
        public static readonly DependencyProperty PropertiesBoxProperty = DependencyProperty.Register(
            nameof(PropertiesBox), typeof(ControlTemplate), typeof(FlowchartEditor), new FrameworkPropertyMetadata(default(ControlTemplate)));

        public ControlTemplate PropertiesBox
        {
            get
            {
                return (ControlTemplate)GetValue(PropertiesBoxProperty);
            }
            set
            {
                SetValue(PropertiesBoxProperty, value);
            }
        }
        #endregion

        #region SelectedObject

        public static readonly DependencyProperty SelectedObjectProperty = DependencyProperty.Register(nameof(SelectedObject), typeof(object), typeof(FlowchartEditor), new UIPropertyMetadata(default(object)));
        public object SelectedObject
        {
            get
            {
                return (object)GetValue(SelectedObjectProperty);
            }
            set
            {
                SetValue(SelectedObjectProperty, value);
            }
        }

        #endregion 

        #region Users
        public static readonly DependencyProperty UsersProperty
            = DependencyProperty.Register(nameof(Users), typeof(List<SelectOption>), typeof(FlowchartEditor), new UIPropertyMetadata(default(List<SelectOption>)));
        public List<SelectOption> Users
        {
            get
            {
                return (List<SelectOption>)GetValue(UsersProperty);
            }
            set
            {
                SetValue(UsersProperty, value);
            }
        }
        #endregion

        #region Roles
        public static readonly DependencyProperty RolesProperty
            = DependencyProperty.Register(nameof(Roles), typeof(List<SelectOption>), typeof(FlowchartEditor), new UIPropertyMetadata(default(List<SelectOption>)));
        public List<SelectOption> Roles
        {
            get
            {
                return (List<SelectOption>)GetValue(RolesProperty);
            }
            set
            {
                SetValue(RolesProperty, value);
            }
        }
        #endregion

    }
}