using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;
using System.Windows.Markup;
using System.Xaml.Schema;

namespace DataManager
{
    public partial class NavChart : Form
    {
        private string fundId;
        private DataTable nav;
        private DataTable indexNav;
        private DateTime oldestPriceDate = new DateTime(2000,1,1);
        private DateTime latestPriceDate = DateTime.Today;


        public NavChart(string fundId, DataTable nav)
        {
            InitializeComponent();

            this.fundId = fundId;
            this.nav = nav;

            InitializeData();
        }

        private void InitializeData()
        {
            dtpStartDate.Checked = true;
            if (nav != null && nav.Rows.Count > 0)
            {
                oldestPriceDate = DateTime.Parse(nav.Select("", "price_date")[0]["price_date"].ToString());

                if (oldestPriceDate <= new DateTime(1990, 1, 1)) oldestPriceDate = new DateTime(1990, 1, 1);

                latestPriceDate = DateTime.Parse(nav.Select("", "price_date")[nav.Rows.Count - 1]["price_date"].ToString());

                dtpStartDate.Value = oldestPriceDate;
            }
                
            dtpEndDate.Checked = true;
            dtpEndDate.Value = DateTime.Today;

            cmbTimePeriod.SelectedIndex = 0;

            cmbBenchmark.DataSource = DataAccess.Get_dm_fund_benchmark(fundId);
            cmbBenchmark.DisplayMember = "index_short_name";
            cmbBenchmark.ValueMember = "index_id";
            cmbBenchmark.SelectedIndex = 0; 

            chtNav.ChartAreas[0].AxisX.MajorGrid.LineColor = Color.LightGray;
            chtNav.ChartAreas[0].AxisY.MajorGrid.LineColor = Color.Gray;
            chtNav.ChartAreas[0].AxisY.MinorGrid.Enabled = true;
            chtNav.ChartAreas[0].AxisY.MinorGrid.LineColor = Color.LightGray;
            chtNav.ChartAreas[0].AxisY.MinorGrid.LineDashStyle = ChartDashStyle.Dot;
            chtNav.ChartAreas[0].AxisY2.MinorGrid.Enabled = false;
            chtNav.ChartAreas[0].AxisY2.MajorGrid.LineColor = Color.LightGray;

            // Y 轴最大最小值自适应
            chtNav.ChartAreas[0].AxisY.IsStartedFromZero = false;
            chtNav.ChartAreas[0].AxisY2.IsStartedFromZero = false;

            Series seriesFund = chtNav.Series[0];
            seriesFund.ChartType = SeriesChartType.Line;
            seriesFund.MarkerStyle = MarkerStyle.Circle;
            seriesFund.LegendText = "分红再投净值";
            BindChartData(nav, seriesFund);

            Series seriesIndex = chtNav.Series[1];
            seriesIndex.ChartType = SeriesChartType.Line;
            seriesIndex.YAxisType = AxisType.Secondary;
            seriesIndex.LegendText = cmbBenchmark.GetItemText(cmbBenchmark.SelectedItem);
            string indexId = cmbBenchmark.SelectedValue.ToString();
            indexNav = DataAccess.Get_Nav(indexId, oldestPriceDate, latestPriceDate);
            BindChartData(indexNav, seriesIndex);

        }

        private DataTable FilterDate(DataTable data, DateTime startDate, DateTime endDate)
        {
            DataTable dt = null;

            if (startDate > endDate)
            {
                MessageBox.Show("起始日不能大于截止日哦");
                return null;
            }

            if (data != null && data.Rows.Count > 0)
            {

                string expression = "price_date <= #" + endDate.ToString() + "# and price_date >= #" + startDate.ToString() + "#";
                DataRow[] rows = data.Select(expression, "price_date");

                if (rows != null && rows.Length > 0)
                    dt = rows.CopyToDataTable();
            }

            return dt;
        }

        private void BindChartData(DataTable data, Series series)
        {
            if (data != null && data.Rows.Count > 0)
                series.Points.DataBind(data.AsEnumerable(), "price_date", "cumulative_nav", "");

        }


        // 这个事件不好用，但Value_Changed会深度死机
        private void dtpEndDate_Leave(object sender, EventArgs e)
        {

        }

        private void btnDateChanged_Click(object sender, EventArgs e)
        {
            DateTime startDate = dtpStartDate.Value;
            if (dtpStartDate.Checked == false) startDate = DateTime.MinValue;
            
            DateTime endDate = dtpEndDate.Value;
            if (dtpEndDate.Checked == false) endDate = DateTime.MaxValue;

            BindChartData(FilterDate(nav, startDate, endDate), chtNav.Series["fund"]);
            BindChartData(FilterDate(indexNav, startDate, endDate), chtNav.Series["index"]);
        }

        private void cmbTimePeriod_SelectedIndexChanged(object sender, EventArgs e)
        {
            DateTime startDate = new DateTime();
            DateTime endDate = DateTime.Today;

            switch (cmbTimePeriod.SelectedIndex)
            {
                case 0:
                    startDate = oldestPriceDate;
                    break;
                case 1:
                    startDate = endDate.AddMonths(-3);
                    break;
                case 2:
                    startDate = endDate.AddYears(-1);
                    break;
                case 3:
                    startDate = endDate.AddYears(-2);
                    break;
                case 4:
                    startDate = endDate.AddYears(-3);
                    break;
                case 5:
                    startDate = endDate.AddYears(-5);
                    break;
                case 6:
                    startDate = endDate.AddYears(-10);
                    break;
                default:
                    startDate = oldestPriceDate;
                    break;
            }

            dtpStartDate.Value = startDate;
            dtpEndDate.Value = endDate;

            BindChartData(FilterDate(nav, startDate, endDate), chtNav.Series["fund"]);
            BindChartData(FilterDate(indexNav, startDate, endDate), chtNav.Series["index"]);
        }

        private void cmbBenchmark_SelectedIndexChanged(object sender, EventArgs e)
        {
            string indexId = cmbBenchmark.SelectedValue.ToString();

            if(indexId.Length != 10) return;

            indexNav = DataAccess.Get_Nav(indexId, oldestPriceDate, latestPriceDate);

            DateTime startDate = DateTime.Parse(dtpStartDate.Text);
            DateTime endDate = DateTime.Parse(dtpEndDate.Text);

            chtNav.Series["index"].LegendText = cmbBenchmark.GetItemText(cmbBenchmark.SelectedItem); ;

            BindChartData(FilterDate(indexNav, startDate, endDate), chtNav.Series["index"]);

        }
    }
}