using System;
using System.Collections.Generic;
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 Aitex.UI.Charting.ViewModel;

using Abt.Controls.SciChart;
using DataAnalysisControl.Core;

namespace Aitex.UI.Charting.View
{
    /// <summary>
    /// Interaction logic for PlotView.xaml
    /// </summary>
    public partial class PlotView : UserControl
    {
        public PlotView()
        {
            InitializeComponent();

            _viewModel = new PlotViewModel(this);
            DataContext = _viewModel;

            IsVisibleChanged += new DependencyPropertyChangedEventHandler(PlotView_IsVisibleChanged);
            //Loaded += (s, e) => DataContext = _viewModel;
            
            sciChart.XAxis.VisibleRangeChanged += new EventHandler<Abt.Controls.SciChart.VisibleRangeChangedEventArgs>(Axis_VisibleRangeChanged);
            sciChart.YAxis.VisibleRangeChanged += new EventHandler<Abt.Controls.SciChart.VisibleRangeChangedEventArgs>(Axis_VisibleRangeChanged);
        }

        void PlotView_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            if ((bool)e.NewValue)
            {
                //设置Charting的主题模式
                //ThemeManager.SetTheme(sciChart, "ExpressionLight");
                //ThemeManager.SetTheme(sciChart, "Chrome");
                //ThemeManager.SetTheme(sciChart, "BlackSteel");

                //重置Charting的X轴显示区域
                _viewModel.ResetXAxisRange2DataSourceRange.Execute(sciChart);
            }
        }

        List<Tuple<IComparable, IComparable, IComparable, IComparable, DateTime>> _rangeHistory = new List<Tuple<IComparable, IComparable, IComparable, IComparable, DateTime>>();
        bool _skipUndo = false;

        void Axis_VisibleRangeChanged(object sender, Abt.Controls.SciChart.VisibleRangeChangedEventArgs e)
        {
            if (!_skipUndo)
            {
                try
                {
                    //System.Diagnostics.Debug.Write(".");
                    if (_rangeHistory.Count > 0 && DateTime.Now - _rangeHistory[_rangeHistory.Count - 1].Item5 < new TimeSpan(0, 0, 0, 0, 500))
                    {
                        var old = _rangeHistory[_rangeHistory.Count -1];
                        _rangeHistory[_rangeHistory.Count - 1] =
                            new Tuple<IComparable, IComparable, IComparable, IComparable, DateTime>(old.Item1, old.Item2,
                                old.Item3, old.Item4, DateTime.Now);
                        System.Diagnostics.Debug.Write("*");
                    }
                    else
                    {

                        if (_rangeHistory.Count > 100) _rangeHistory.RemoveAt(0);
                        _rangeHistory.Add(new Tuple<IComparable, IComparable, IComparable, IComparable, DateTime>(
                            sciChart.XAxis.VisibleRange.Min, sciChart.XAxis.VisibleRange.Max,
                            sciChart.YAxis.VisibleRange.Min, sciChart.YAxis.VisibleRange.Max, DateTime.Now));
                        System.Diagnostics.Debug.Write("#");

                    }
                }
                catch (Exception ex)
                {
                    CONTEXT.WriteLog(ex);
                }
            }
        }

        PlotViewModel _viewModel;

        /// <summary>
        /// 撤销至上一次的视图
        /// </summary>
        private void Undo_Last_View_Range()
        {
            sciChart.XAxis.AutoRange = Abt.Controls.SciChart.Visuals.Axes.AutoRange.Never;
            sciChart.YAxis.AutoRange = Abt.Controls.SciChart.Visuals.Axes.AutoRange.Never;
            if (_rangeHistory.Count > 0)
            {
                try
                {
                    _skipUndo = true;
                    var s1 = (Abt.Controls.SciChart.IRange)sciChart.XAxis.VisibleRange.Clone();
                    s1.Min = _rangeHistory[_rangeHistory.Count - 1].Item1;
                    s1.Max = _rangeHistory[_rangeHistory.Count - 1].Item2;
                    sciChart.XAxis.VisibleRange = s1;
                    var s2 = (Abt.Controls.SciChart.IRange)sciChart.YAxis.VisibleRange.Clone();
                    s2.Min = _rangeHistory[_rangeHistory.Count - 1].Item3;
                    s2.Max = _rangeHistory[_rangeHistory.Count - 1].Item4;
                    sciChart.YAxis.VisibleRange = s2;
                    sciChart.YAxis.InvalidateElement();
                    sciChart.XAxis.InvalidateElement();
                    _rangeHistory.RemoveAt(_rangeHistory.Count - 1);
                }
                catch (Exception ex)
                {
                    CONTEXT.WriteLog(ex);
                }
                finally
                {
                    _skipUndo = false;
                }
            }
        }

        /// <summary>
        /// 鼠标双击事件的定义
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void sciChart_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            if (e.ChangedButton == MouseButton.Right)
            {
                //右键双击，恢复1:1的视图
                this.sciChart.ZoomExtents();
            }
            else if (e.ChangedButton == MouseButton.Left)
            {
                //左键双击，恢复至上一次的视图比例
                Undo_Last_View_Range();
            }
        }

        /// <summary>
        /// 显示全部数据
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void showAllButton_Click(object sender, RoutedEventArgs e)
        {
            this.sciChart.ZoomExtents();
        }
    }
}