using HMI.Base;
using LiveChartsCore;
using LiveChartsCore.Defaults;
using LiveChartsCore.Drawing;
using LiveChartsCore.Drawing.Layouts;
using LiveChartsCore.Kernel.Sketches;
using LiveChartsCore.SkiaSharpView;
using LiveChartsCore.SkiaSharpView.Drawing;
using LiveChartsCore.SkiaSharpView.Drawing.Geometries;
using LiveChartsCore.SkiaSharpView.Drawing.Layouts;
using LiveChartsCore.SkiaSharpView.Painting;
using LiveChartsCore.SkiaSharpView.SKCharts;
using SkiaSharp;
using System.Collections.ObjectModel;

namespace Plugin.BurnIn
{
    public class SeriesConfig
    {
        public static readonly float FontSize = 12;
        /// <summary>
        /// 数据名
        /// </summary>
        public string Name { get; set; }
        public string YAxesName { get; set; }
        public int YAxesIndex { get; set; }
    }

    public class CustomLegend : SKDefaultLegend
    {

        protected override Layout<SkiaSharpDrawingContext> GetLayout(LiveChartsCore.Chart chart)
        {
            var stackLayout = new StackLayout
            {
                Orientation = ContainerOrientation.Horizontal,
                Padding = new Padding(0, 10, 0, 0),
                HorizontalAlignment = Align.Start,
                VerticalAlignment = Align.Middle,
            };

            foreach (var series in chart.Series.Where(x => x.IsVisibleAtLegend))
            {
                stackLayout.Children.Add(new LegendItem(series));
            }
            return stackLayout;
        }
    }

    public class LegendItem : StackLayout
    {
        public LegendItem(ISeries series)
        {
            Orientation = ContainerOrientation.Horizontal;
            Padding = new Padding(0);
            VerticalAlignment = Align.Start;
            HorizontalAlignment = Align.Middle;
            Opacity = series.IsVisible ? 1 : 0.5f;

            var miniature = (IDrawnElement<SkiaSharpDrawingContext>)series.GetMiniatureGeometry(null);
            Children = new List<IDrawnElement<SkiaSharpDrawingContext>> {
                miniature,
            new LabelGeometry
            {
                Text = series.Name,
                TextSize = SeriesConfig.FontSize,
                Paint = new SolidColorPaint(SKColors.Black){
                    SKTypeface = SKFontManager.Default.MatchCharacter('汉')
                },
                Padding = new Padding(5,0,10,0),
                VerticalAlign = Align.Middle,
                HorizontalAlign = Align.Start
            }};
        }
    }

    public partial class LiveChart : NotifyControl
    {
        private static SKColor[] colors = new SKColor[] {
            //new SKColor(229, 84, 62),
            //new SKColor(72, 143, 239),
            //new SKColor(147, 196, 83),
            new SKColor(255, 0, 0),
            new SKColor(0, 0, 255),
            new SKColor(0, 255, 0),
            new SKColor(76, 184, 210),
            new SKColor(246, 198, 50),
        };

        private DateTime startTime;
        private string configText;
        private bool showLegend;
        private bool enableResize;

        private SolidColorPaint tooltipTextPaint = new SolidColorPaint(SKColors.Black)
        {
            SKTypeface = SKFontManager.Default.MatchCharacter('汉')
        };
        public SolidColorPaint TooltipTextPaint
        {
            get => tooltipTextPaint;
            set
            {
                Set(ref tooltipTextPaint, value);
            }
        }

        private double tooltipTextSize = SeriesConfig.FontSize;
        public double TooltipTextSize
        {
            get => tooltipTextSize;
            set
            {
                Set(ref tooltipTextSize, value);
            }
        }

        private Dictionary<string, SeriesConfig> configCache = new Dictionary<string, SeriesConfig>();

        private Dictionary<string, ISeries> seriesCache = new Dictionary<string, ISeries>();
        private Dictionary<string, List<DateTimePoint>> valueCache = new Dictionary<string, List<DateTimePoint>>();

        private Dictionary<string, double> minValueCache = new Dictionary<string, double>();
        private Dictionary<string, double> maxValueCache = new Dictionary<string, double>();

        private ObservableCollection<ISeries> series = new ObservableCollection<ISeries>();
        public ObservableCollection<ISeries> Series
        {
            get => series;
            set
            {

                Set(ref series, value);
            }
        }

        public ObservableCollection<ICartesianAxis> YAxes { get; set; } = new ObservableCollection<ICartesianAxis>();

        private Axis[] xAxes;
        public Axis[] XAxes
        {
            get => xAxes; set
            {
                Set(ref xAxes, value);
            }
        }

        public DrawMarginFrame DrawMarginFrame => new DrawMarginFrame()
        {
            Fill = new SolidColorPaint(new SKColor(223, 223, 223)),
            Stroke = new SolidColorPaint(new SKColor(180, 180, 180), 1)
        };

        public object Sync { get; } = new object();

        private int CreateYAxis(string name)
        {
            for (int i = 0; i < YAxes.Count; i++)
            {
                if (YAxes[i].Name == name)
                {
                    return i;
                }
            }
            if (YAxes.Count == 0)
            {
                YAxes.Add(new Axis
                {
                    Name = name,
                    MinStep = 1,
                    TextSize = SeriesConfig.FontSize,
                    NameTextSize = SeriesConfig.FontSize,
                    NamePaint = new SolidColorPaint(new SKColor(0, 0, 0))
                    {
                        SKTypeface = SKFontManager.Default.MatchCharacter('汉')
                    },
                    Padding = new Padding(0, 0, 5, 0),
                    LabelsPaint = new SolidColorPaint(new SKColor(0, 0, 0)),
                    SeparatorsPaint = new SolidColorPaint
                    {
                        Color = SKColors.Black.WithAlpha(30),
                        StrokeThickness = 0.5f
                    },
                    TicksPaint = new SolidColorPaint
                    {
                        Color = SKColor.Empty,
                        StrokeThickness = 0
                    },
                });
            }
            else
            {
                YAxes.Add(new Axis
                {
                    Name = name,
                    Position = LiveChartsCore.Measure.AxisPosition.End,
                    MinStep = 1,
                    TextSize = SeriesConfig.FontSize,
                    NameTextSize = SeriesConfig.FontSize,
                    NamePaint = new SolidColorPaint(new SKColor(0, 0, 0))
                    {
                        SKTypeface = SKFontManager.Default.MatchCharacter('汉')
                    },
                    Padding = new Padding(5, 0, 0, 0),
                    LabelsPaint = new SolidColorPaint(new SKColor(0, 0, 0)),
                    TicksPaint = new SolidColorPaint
                    {
                        Color = SKColor.Empty,
                        StrokeThickness = 0
                    },
                    ShowSeparatorLines = false,
                });
            }
            return YAxes.Count - 1;
        }

        public void RefreshConfig(string configStr)
        {
            configText = configStr;
            configCache.Clear();
            seriesCache.Clear();
            valueCache.Clear();
            minValueCache.Clear();
            maxValueCache.Clear();
            Series.Clear();
            YAxes.Clear();
            startTime = DateTime.MinValue;
            try
            {
                string[] arr = configStr.Split(';');
                for (int i = 0; i < arr.Length; i++)
                {
                    var config = arr[i];
                    string[] datas = config.Split(',');
                    var sConfig = new SeriesConfig();
                    if (datas.Length >= 2)
                    {
                        sConfig.YAxesName = datas[1];
                    }
                    else
                    {
                        sConfig.YAxesName = datas[0];
                    }

                    sConfig.Name = datas[0];
                    sConfig.YAxesIndex = CreateYAxis(sConfig.YAxesName);
                    if (!string.IsNullOrEmpty(sConfig.Name))
                    {
                        configCache[sConfig.Name] = sConfig;
                        var values = new List<DateTimePoint>();
                        valueCache[sConfig.Name] = values;

                        var ls = new LineSeries<DateTimePoint>
                        {
                            Name = sConfig.Name,
                            Values = values,
                            ScalesYAt = sConfig.YAxesIndex,
                            Fill = null,
                            GeometryFill = null,
                            GeometryStroke = null,
                            LineSmoothness = 0,
                            Stroke = new SolidColorPaint(GetColor(i)) { StrokeThickness = 0.8f },
                        };
                        seriesCache[sConfig.Name] = ls;
                        Series.Add(ls);
                    }
                }
                if (showLegend)
                {
                    chart.LegendPosition = LiveChartsCore.Measure.LegendPosition.Top;
                    chart.Legend = new CustomLegend();
                }
                chart.TooltipTextPaint = new SolidColorPaint(SKColors.Black)
                {
                    SKTypeface = SKFontManager.Default.MatchCharacter('汉')
                };
            }
            catch (Exception ex)
            {

            }
        }

        public LiveChart(string configStr, bool showLegend = true, bool enableResize = false)
        {
            DataContext = this;
            this.showLegend = showLegend;
            this.enableResize = enableResize;

            var xAxis = new DateTimeAxis(TimeSpan.FromSeconds(10), Formatter)
            {
                Padding = new Padding(0),
                TextSize = SeriesConfig.FontSize,
                NameTextSize = SeriesConfig.FontSize,
                CustomSeparators = GetSeparators(),
                AnimationsSpeed = TimeSpan.FromMilliseconds(0),
                SeparatorsPaint = new SolidColorPaint(SKColors.Black.WithAlpha(30)),
            };

            XAxes = new Axis[] { xAxis };
            InitializeComponent();
            RefreshConfig(configStr);
        }

        private double[] GetSeparators()
        {
            if (valueCache.Count <= 0)
            {
                return new double[] { DateTime.Now.Ticks };
            }
            if (valueCache.Values.First().Count <= 5)
            {
                //return new double[] { now.Ticks };
                return valueCache.Values.First().Select(e => (double)e.DateTime.Ticks).ToArray();
            }
            var now = valueCache.Values.First().Last().DateTime;

            var step = (now - startTime).TotalSeconds / 6;

            return
            new double[] {
                now.AddSeconds(-5*step).Ticks,
                now.AddSeconds(-4*step).Ticks,
                now.AddSeconds(-3*step).Ticks,
                now.AddSeconds(-2*step).Ticks,
                now.AddSeconds(-step).Ticks,
            };
        }

        private static string Formatter(DateTime date)
        {
            //var secsAgo = (DateTime.Now - date).TotalSeconds;
            //return secsAgo < 1
            //    ? "now"
            //    : $"{secsAgo:N0}s ago";
            return date.ToString("HH:mm:ss");
        }

        private void RefreshChart()
        {
            XAxes[0].CustomSeparators = GetSeparators();
        }

        private double GetMaxByName(string name)
        {
            return maxValueCache.ContainsKey(name) ? maxValueCache[name] : double.MinValue;
        }

        private double GetMinByName(string name)
        {
            return minValueCache.ContainsKey(name) ? minValueCache[name] : double.MaxValue;
        }

        //public void AddData(string name, double value)
        //{
        //    var now = DateTime.Now;
        //    if (valueCache.ContainsKey(name))
        //    {
        //        var config = configCache[name];
        //        valueCache[name].Add(new DateTimePoint(now, value));


        //        minValueCache[config.YAxesName] = Math.Min(GetMinByName(config.YAxesName), value);
        //        maxValueCache[config.YAxesName] = Math.Max(GetMaxByName(config.YAxesName), value);

        //        YAxes[config.YAxesIndex].MinLimit = minValueCache[config.YAxesName] - 1;
        //        YAxes[config.YAxesIndex].MaxLimit = maxValueCache[config.YAxesName] + 1;

        //        RefreshChart();
        //    }
        //    if (startTime == DateTime.MinValue)
        //    {
        //        startTime = now;
        //    }
        //}

        private SKColor GetColor(int index)
        {
            if (index >= colors.Length)
            {
                return colors[index % colors.Length];
            }
            return colors[index];
        }

        private void AddNewSeries(string name, string YName)
        {
            var config = new SeriesConfig
            {
                Name = name,
                YAxesName = YName,
                YAxesIndex = CreateYAxis(YName)
            };
            configCache[name] = config;

            var values = new List<DateTimePoint>();
            valueCache[name] = values;

            var ls = new LineSeries<DateTimePoint>
            {
                Name = name,
                Values = values,
                ScalesYAt = config.YAxesIndex,
                Fill = null,
                GeometryFill = null,
                GeometryStroke = null,
                LineSmoothness = 0,
                Stroke = new SolidColorPaint(GetColor(Series.Count)) { StrokeThickness = 0.8f },
            };
            seriesCache[Name] = ls;
            Series.Add(ls);
        }

        public void AddDynamicData(string name, string YName, DateTime now, double value)
        {
            if (!valueCache.ContainsKey(name))
            {
                AddNewSeries(name, YName);
            }

            var config = configCache[name];
            valueCache[name].Add(new DateTimePoint(now, value));


            minValueCache[config.YAxesName] = Math.Min(GetMinByName(config.YAxesName), value);
            maxValueCache[config.YAxesName] = Math.Max(GetMaxByName(config.YAxesName), value);

            YAxes[config.YAxesIndex].MinLimit = minValueCache[config.YAxesName] - 1;
            YAxes[config.YAxesIndex].MaxLimit = maxValueCache[config.YAxesName] + 1;

            RefreshChart();


            if (startTime == DateTime.MinValue)
            {
                startTime = now;
            }
        }

        public void AddData(string name, DateTime now, double value)
        {
            if (valueCache.ContainsKey(name))
            {
                var config = configCache[name];
                valueCache[name].Add(new DateTimePoint(now, value));


                minValueCache[config.YAxesName] = Math.Min(GetMinByName(config.YAxesName), value);
                maxValueCache[config.YAxesName] = Math.Max(GetMaxByName(config.YAxesName), value);

                YAxes[config.YAxesIndex].MinLimit = minValueCache[config.YAxesName] - 1;
                YAxes[config.YAxesIndex].MaxLimit = maxValueCache[config.YAxesName] + 1;

                RefreshChart();
            }
            if (startTime == DateTime.MinValue)
            {
                startTime = now;
            }
        }

        public void Clear()
        {
            RefreshConfig(configText);
        }

        public bool CanHandle(string name)
        {
            return configCache.ContainsKey(name);
        }

        public List<double> GetSingleData(string name)
        {
            if (valueCache.ContainsKey(name))
            {
                return valueCache[name].Select(d => d.Value.Value).ToList();
            }
            return null;
        }

        private void UserControl_Loaded(object sender, System.Windows.RoutedEventArgs e)
        {
            //refreshTimer.Start();
            //timer?.Start();
        }

        private void UserControl_Unloaded(object sender, System.Windows.RoutedEventArgs e)
        {
            //timer?.Stop();
        }

        private void UserControl_SizeChanged(object sender, System.Windows.SizeChangedEventArgs e)
        {
            if (enableResize)
            {
                var size = FontSizeConverter.CountFontSize(12, ActualHeight, 92);
                foreach (var y in YAxes)
                {
                    y.TextSize = size;
                    y.NameTextSize = size;
                }

                foreach (var x in XAxes)
                {
                    x.TextSize = size;
                    x.NameTextSize = size;
                }
                TooltipTextSize = size;
                //TooltipTextPaint = new SolidColorPaint(SKColors.Black)
                //{
                //    SKTypeface = SKFontManager.Default.MatchCharacter('汉')
                //};
            }
        }
    }
}