using System;
using System.Collections.Specialized;
using System.Windows;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Forms;
using System.Windows.Input;
using JD.Collections.Extensions;
using JD.Core.Collections;
using JD.Timeline.View.ClipView;
using JD.Timeline.View.ClipView.Widgets;
using JD.WPF.Extensions;
using TeaBox;
using TeaBox.ObjectModel;
using JD.Serialization;
using DataFormats = System.Windows.DataFormats;
using DataObject = System.Windows.DataObject;
using DragDropEffects = System.Windows.DragDropEffects;
using MouseEventArgs = System.Windows.Input.MouseEventArgs;


namespace JD.Timeline.View.Pads
{
    /// <summary>
    /// Interaction logic for MoveModelPad.xaml
    /// </summary>
    public partial class MoveModelControl
    {
        #region Variables

        private ClipViewControl _clipViewControl;
        private readonly CollectionViewSource _collectionViewSource;
        private bool _mouseEnteredPressed;

        #endregion

        #region Constructor

        public MoveModelControl()
        {
            InitializeComponent();
            _dataGrid.MouseEnter += _dataGrid_MouseEnter;
            _dataGrid.MouseMove += _dataGrid_MouseMove;
            _dataGrid.PreviewMouseLeftButtonDown += _dataGrid_PreviewMouseLeftButtonDown;
            _collectionViewSource = FindResource("cvsMoveModels") as CollectionViewSource;
        }

        #endregion

        #region Properties

        /// <summary>
        /// The models from the tape
        /// </summary>
        private MoveModelCollection TapeModels
        {
            get
            {
                return _clipViewControl != null && _clipViewControl.Tape != null
                    ? _clipViewControl.Tape.MoveModels()
                    : new MoveModelCollection();
            }
        }

        /// <summary>
        /// The models from the wpf control
        /// </summary>
        private MoveModelCollection PadModels
        {
            get
            {
                return FindResource("models") as MoveModelCollection;
            }
        }

        public ClipViewControl ClipViewControl
        {
            get { return _clipViewControl; }
            set
            {
                _clipViewControl = value;
                if (TapeModels != null)
                {
                    TapeModels.CollectionChanged -= TapeMoveModels_CollectionChanged;
                    TapeModels.ItemChanged -= TapeMoveModels_ItemChanged;
                }
                SynchronizeModelList();
                _collectionViewSource.Source = PadModels;
                if (TapeModels != null)
                {
                    TapeModels.CollectionChanged += TapeMoveModels_CollectionChanged;
                    TapeModels.ItemChanged += TapeMoveModels_ItemChanged;
                }
            }
        }

        /// <summary>
        /// Object to allow selection of item in PropertyBrowser
        /// </summary>
        public DataSourceContainer DataSourceContainer { get; set; }

        private Point MouseLeftButtonDownPosition { get; set; }

        #endregion

        #region Methods

        /// <summary>
        /// Synchronize the models from wpf controls with models from tape
        /// </summary>
        void SynchronizeModelList()
        {
            PadModels.SynchronizeWith(TapeModels, PadModels.Add, model => PadModels.Remove(model));
        }

        void TapeMoveModels_ItemChanged(object sender, ItemChangedEventArgs<MoveModel> args)
        {
            if (args.PropertyName == "InstancesCount" && args.Item.InstancesCount <= 1)
            {
                //We need to refresh the model list when instances count changes from 0 to 1 or from 1 to 0
                SynchronizeModelList();
            }
        }

        void TapeMoveModels_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            SynchronizeModelList();
        }
        
        void _dataGrid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            MouseLeftButtonDownPosition = e.GetPosition(this);
        }

        // Avoid conflicting with dragged Avalon pad
        private void _dataGrid_MouseEnter(object sender, MouseEventArgs e)
        {
            this._mouseEnteredPressed = e.LeftButton == MouseButtonState.Pressed;
        }

        /// <summary>
        /// Starts the drag & drop action
        /// </summary>
        private void _dataGrid_MouseMove(object sender, MouseEventArgs e)
        {
            var moveModel = _dataGrid.GetCurrentRowItem<MoveModel>(e.GetPosition);
            if (e.LeftButton == MouseButtonState.Pressed
                && !_mouseEnteredPressed
                && moveModel != null
                && !(e.OriginalSource is Hyperlink))
            {
                if (e.GetPosition(this) != MouseLeftButtonDownPosition)
                {
                    TeaBox.ObjectModel.Application.Main.Dispatcher.DispatchAsync(() =>
                    {
                        _dataGrid.CancelEdit();
                        var dragData = new MoveModelDragData { ModelName = moveModel.Name };
                        DragDrop.DoDragDrop(_dataGrid, new DataObject(DataFormats.Serializable, dragData),
                            DragDropEffects.Copy);
                    }, true);
                }
            }
        }

        /// <summary>
        /// Allows to change the color of the model
        /// </summary>
        private void Color_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (e.ClickCount == 1 && sender is FrameworkElement)
            {
                var moveModel = ((FrameworkElement)sender).DataContext as MoveModel;
                if (moveModel == null)
                    return;
                var dlg = new ColorDialog();
                dlg.Color = moveModel.Color;
                if (dlg.ShowDialog() == DialogResult.OK)
                {
                    moveModel.Color = dlg.Color;
                }
            }
        }

        /// <summary>
        /// Allows to select all instances of a model on click
        /// </summary>
        private void InstancesCount_Click(object sender, RoutedEventArgs e)
        {
            var moveModel = ((FrameworkElement)sender).DataContext as MoveModel;
            if (ClipViewControl.TrackView != null && moveModel != null)
            {
                TeaBox.ObjectModel.Application.Main.Dispatcher.DispatchAsync(
                    () =>
                    {
                        ClipViewControl.TrackView.SelectAll<MotionClipWidget>(x => x.Model.Model == moveModel);
                        ClipViewControl.ZoomExtents();
                    },
                    forceAsync: true);
            }
        }

        /// <summary>
        /// Selects the model in PropertyBrowser
        /// </summary>
        private void _dataGrid_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
        {
            var moveModel = e.AddedItems.FirstOf<MoveModel>();
            if (moveModel != null)
            {
                DataSourceContainer.SetDataSource(moveModel, null);
                DataSourceContainer.DataSourceName = moveModel.Name;
            }
        }

        #endregion
    }

    #region Dragging

    [Serializable]
    public class MoveModelDragData
    {
        private string _modelName;

        public string ModelName
        {
            get { return _modelName; }
            set { _modelName = value; }
        }
    }

    #endregion
}