using System;
using System.ComponentModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using LiveCharts;
using LiveCharts.Defaults;
using LiveCharts.Wpf;
using Wpf.Annotations;

namespace Wpf.CartesianChart.Financial
{
    public partial class OhclExample : UserControl, INotifyPropertyChanged
    {
        private string[] _labels;

        public OhclExample()
        {
            InitializeComponent();

            SeriesCollection = new SeriesCollection
            {
                new OhlcSeries()
                {
                    Values = new ChartValues<OhlcPoint>
                    {
                        new OhlcPoint(32, 35, 30, 32),
                        new OhlcPoint(33, 38, 31, 37),
                        new OhlcPoint(35, 42, 30, 40),
                        new OhlcPoint(37, 40, 35, 38),
                        new OhlcPoint(35, 38, 32, 33)
                    }
                },
                new LineSeries
                {
                    Values = new ChartValues<double> {30, 32, 35, 30, 28},
                    Fill = Brushes.Transparent
                }
            };

            //based on https://github.com/beto-rodriguez/Live-Charts/issues/166 
            //The Ohcl point X property is zero based indexed.
            //this means the first point is 0, second 1, third 2.... and so on
            //then you can use the Axis.Labels properties to map the chart X with a label in the array.
            //for more info see (mapped labels section) 
            //http://lvcharts.net/#/examples/v1/labels-wpf?path=WPF-Components-Labels
            
            Labels = new []
            {
                DateTime.Now.ToString("dd MMM"),
                DateTime.Now.AddDays(1).ToString("dd MMM"),
                DateTime.Now.AddDays(2).ToString("dd MMM"),
                DateTime.Now.AddDays(3).ToString("dd MMM"),
                DateTime.Now.AddDays(4).ToString("dd MMM"),
            };

            DataContext = this;
        }

        public SeriesCollection SeriesCollection { get; set; }

        public string[] Labels
        {
            get { return _labels; }
            set
            {
                _labels = value;
                OnPropertyChanged("Labels");
            }
        }

        private void UpdateAllOnClick(object sender, RoutedEventArgs e)
        {
            var r = new Random();

            foreach (var point in SeriesCollection[0].Values.Cast<OhlcPoint>())
            {
                point.Open = r.Next((int) point.Low, (int) point.High);
                point.Close = r.Next((int) point.Low, (int) point.High);
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string propertyName = null)
        {
            if (PropertyChanged != null) PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}