using System;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Web.UI;
using HtmlTag = System.Web.UI.HtmlTextWriterTag;
using HtmlAttr = System.Web.UI.HtmlTextWriterAttribute;

namespace Server.Engines.Reports
{
  public class HtmlRenderer
  {
    private const string ShardTitle = "Shard";

    private static readonly string FtpHost = null;

    private static readonly string FtpUsername = null;
    private static readonly string FtpPassword = null;

    private static readonly string FtpStatsDirectory = null;
    private static readonly string FtpStaffDirectory = null;
    private ObjectCollection m_Objects;
    private string m_OutputDirectory;

    private DateTime m_TimeStamp;
    private string m_Title;
    private string m_Type;

    private HtmlRenderer(string outputDirectory)
    {
      m_Type = outputDirectory;
      m_Title = m_Type == "staff" ? "Staff" : "Stats";
      m_OutputDirectory = Path.Combine(Core.BaseDirectory, "output");

      if (!Directory.Exists(m_OutputDirectory))
        Directory.CreateDirectory(m_OutputDirectory);

      m_OutputDirectory = Path.Combine(m_OutputDirectory, outputDirectory);

      if (!Directory.Exists(m_OutputDirectory))
        Directory.CreateDirectory(m_OutputDirectory);
    }

    public HtmlRenderer(string outputDirectory, Snapshot ss, SnapshotHistory history) : this(outputDirectory)
    {
      m_TimeStamp = ss.TimeStamp;

      m_Objects = new ObjectCollection();

      for (int i = 0; i < ss.Children.Count; ++i)
        m_Objects.Add(ss.Children[i]);

      m_Objects.Add(BarGraph.OverTime(history, "General Stats", "Clients", 1, 100, 6));
      m_Objects.Add(BarGraph.OverTime(history, "General Stats", "Items", 24, 9, 1));
      m_Objects.Add(BarGraph.OverTime(history, "General Stats", "Players", 24, 9, 1));
      m_Objects.Add(BarGraph.OverTime(history, "General Stats", "NPCs", 24, 9, 1));
      m_Objects.Add(BarGraph.DailyAverage(history, "General Stats", "Clients"));
      m_Objects.Add(BarGraph.Growth(history, "General Stats", "Clients"));
    }

    public HtmlRenderer(string outputDirectory, StaffHistory history) : this(outputDirectory)
    {
      m_TimeStamp = DateTime.UtcNow;

      m_Objects = new ObjectCollection();

      history.Render(m_Objects);
    }

    public void Render()
    {
      Console.WriteLine("Reports: {0}: Render started", m_Title);

      RenderFull();

      for (int i = 0; i < m_Objects.Count; ++i)
        RenderSingle(m_Objects[i]);

      Console.WriteLine("Reports: {0}: Render complete", m_Title);
    }

    public void Upload()
    {
      if (FtpHost == null)
        return;

      Console.WriteLine("Reports: {0}: Upload started", m_Title);

      string filePath = Path.Combine(m_OutputDirectory, "upload.ftp");

      using (StreamWriter op = new StreamWriter(filePath))
      {
        op.WriteLine("open \"{0}\"", FtpHost);
        op.WriteLine(FtpUsername);
        op.WriteLine(FtpPassword);
        op.WriteLine("cd \"{0}\"", m_Type == "staff" ? FtpStaffDirectory : FtpStatsDirectory);
        op.WriteLine("mput \"{0}\"", Path.Combine(m_OutputDirectory, "*.html"));
        op.WriteLine("mput \"{0}\"", Path.Combine(m_OutputDirectory, "*.css"));
        op.WriteLine("binary");
        op.WriteLine("mput \"{0}\"", Path.Combine(m_OutputDirectory, "*.png"));
        op.WriteLine("disconnect");
        op.Write("quit");
      }

      ProcessStartInfo psi = new ProcessStartInfo();

      psi.FileName = "ftp";
      psi.Arguments = $"-i -s:\"{filePath}\"";

      psi.CreateNoWindow = true;
      psi.WindowStyle = ProcessWindowStyle.Hidden;
      //psi.UseShellExecute = true;

      try
      {
        Process p = Process.Start(psi);

        p.WaitForExit();
      }
      catch
      {
      }

      Console.WriteLine("Reports: {0}: Upload complete", m_Title);

      try
      {
        File.Delete(filePath);
      }
      catch
      {
      }
    }

    public void RenderFull()
    {
      string filePath = Path.Combine(m_OutputDirectory, "reports.html");

      using (StreamWriter op = new StreamWriter(filePath))
      {
        using (HtmlTextWriter html = new HtmlTextWriter(op, "\t"))
        {
          RenderFull(html);
        }
      }

      string cssPath = Path.Combine(m_OutputDirectory, "styles.css");

      if (File.Exists(cssPath))
        return;

      using (StreamWriter css = new StreamWriter(cssPath))
      {
        css.WriteLine("body { background-color: #FFFFFF; font-family: verdana, arial; font-size: 11px; }");
        css.WriteLine("a { color: #28435E; }");
        css.WriteLine("a:hover { color: #4878A9; }");
        css.WriteLine("td.header { background-color: #9696AA; font-weight: bold; font-size: 12px; }");
        css.WriteLine("td.lentry { background-color: #D7D7EB; width: 10%; }");
        css.WriteLine("td.rentry { background-color: #FFFFFF; width: 90%; }");
        css.WriteLine("td.entry { background-color: #FFFFFF; }");
        css.WriteLine("td { font-size: 11px; }");
        css.Write(".tbl-border { background-color: #46465A; }");
      }
    }

    public void RenderFull(HtmlTextWriter html)
    {
      html.RenderBeginTag(HtmlTag.Html);

      html.RenderBeginTag(HtmlTag.Head);

      html.RenderBeginTag(HtmlTag.Title);
      html.Write("{0} Statistics", ShardTitle);
      html.RenderEndTag();

      html.AddAttribute("rel", "stylesheet");
      html.AddAttribute(HtmlAttr.Type, "text/css");
      html.AddAttribute(HtmlAttr.Href, "styles.css");
      html.RenderBeginTag(HtmlTag.Link);
      html.RenderEndTag();

      html.RenderEndTag();

      html.RenderBeginTag(HtmlTag.Body);

      for (int i = 0; i < m_Objects.Count; ++i)
      {
        RenderDirect(m_Objects[i], html);
        html.Write("<br><br>");
      }

      html.RenderBeginTag(HtmlTag.Center);
      TimeZone tz = TimeZone.CurrentTimeZone;
      bool isDaylight = tz.IsDaylightSavingTime(m_TimeStamp);
      TimeSpan utcOffset = tz.GetUtcOffset(m_TimeStamp);

      html.Write("Snapshot taken at {0:d} {0:t}. All times are {1}.", m_TimeStamp, tz.StandardName);
      html.RenderEndTag();

      html.RenderEndTag();

      html.RenderEndTag();
    }

    public static string SafeFileName(string name)
    {
      return name.ToLower().Replace(' ', '_');
    }

    public void RenderSingle(PersistableObject obj)
    {
      string filePath = Path.Combine(m_OutputDirectory, SafeFileName(FindNameFrom(obj)) + ".html");

      using (StreamWriter op = new StreamWriter(filePath))
      {
        using (HtmlTextWriter html = new HtmlTextWriter(op, "\t"))
        {
          RenderSingle(obj, html);
        }
      }
    }

    private string FindNameFrom(PersistableObject obj)
    {
      if (obj is Report report)
        return report.Name;
      if (obj is Chart chart)
        return chart.Name;

      return "Invalid";
    }

    public void RenderSingle(PersistableObject obj, HtmlTextWriter html)
    {
      html.RenderBeginTag(HtmlTag.Html);

      html.RenderBeginTag(HtmlTag.Head);

      html.RenderBeginTag(HtmlTag.Title);
      html.Write("{0} Statistics - {1}", ShardTitle, FindNameFrom(obj));
      html.RenderEndTag();

      html.AddAttribute("rel", "stylesheet");
      html.AddAttribute(HtmlAttr.Type, "text/css");
      html.AddAttribute(HtmlAttr.Href, "styles.css");
      html.RenderBeginTag(HtmlTag.Link);
      html.RenderEndTag();

      html.RenderEndTag();

      html.RenderBeginTag(HtmlTag.Body);

      html.RenderBeginTag(HtmlTag.Center);

      RenderDirect(obj, html);

      html.Write("<br>");

      TimeZone tz = TimeZone.CurrentTimeZone;
      bool isDaylight = tz.IsDaylightSavingTime(m_TimeStamp);
      TimeSpan utcOffset = tz.GetUtcOffset(m_TimeStamp);

      html.Write("Snapshot taken at {0:d} {0:t}. All times are {1}.", m_TimeStamp, tz.StandardName);
      html.RenderEndTag();

      html.RenderEndTag();

      html.RenderEndTag();
    }

    public void RenderDirect(PersistableObject obj, HtmlTextWriter html)
    {
      if (obj is Report report)
        RenderReport(report, html);
      else if (obj is BarGraph graph)
        RenderBarGraph(graph, html);
      else if (obj is PieChart chart)
        RenderPieChart(chart, html);
    }

    private void RenderPieChart(PieChart chart, HtmlTextWriter html)
    {
      PieChartRenderer pieChart = new PieChartRenderer(Color.White);

      pieChart.ShowPercents = chart.ShowPercents;

      string[] labels = new string[chart.Items.Count];
      string[] values = new string[chart.Items.Count];

      for (int i = 0; i < chart.Items.Count; ++i)
      {
        ChartItem item = chart.Items[i];

        labels[i] = item.Name;
        values[i] = item.Value.ToString();
      }

      pieChart.CollectDataPoints(labels, values);

      Bitmap bmp = pieChart.Draw();

      string fileName = chart.FileName + ".png";
      bmp.Save(Path.Combine(m_OutputDirectory, fileName), ImageFormat.Png);

      html.Write("<!-- ");

      html.AddAttribute(HtmlAttr.Href, "#");
      html.AddAttribute(HtmlAttr.Onclick,
        $"javascript:window.open('{SafeFileName(FindNameFrom(chart))}.html','ChildWindow','width={bmp.Width + 30},height={bmp.Height + 80},resizable=no,status=no,toolbar=no')");
      html.RenderBeginTag(HtmlTag.A);
      html.Write(chart.Name);
      html.RenderEndTag();

      html.Write(" -->");

      html.AddAttribute(HtmlAttr.Cellpadding, "0");
      html.AddAttribute(HtmlAttr.Cellspacing, "0");
      html.AddAttribute(HtmlAttr.Border, "0");
      html.RenderBeginTag(HtmlTag.Table);

      html.RenderBeginTag(HtmlTag.Tr);
      html.AddAttribute(HtmlAttr.Class, "tbl-border");
      html.RenderBeginTag(HtmlTag.Td);

      html.AddAttribute(HtmlAttr.Width, "100%");
      html.AddAttribute(HtmlAttr.Cellpadding, "4");
      html.AddAttribute(HtmlAttr.Cellspacing, "1");
      html.RenderBeginTag(HtmlTag.Table);

      html.RenderBeginTag(HtmlTag.Tr);

      html.AddAttribute(HtmlAttr.Colspan, "10");
      html.AddAttribute(HtmlAttr.Width, "100%");
      html.AddAttribute(HtmlAttr.Align, "center");
      html.AddAttribute(HtmlAttr.Class, "header");
      html.RenderBeginTag(HtmlTag.Td);
      html.Write(chart.Name);
      html.RenderEndTag();
      html.RenderEndTag();

      html.RenderBeginTag(HtmlTag.Tr);

      html.AddAttribute(HtmlAttr.Colspan, "10");
      html.AddAttribute(HtmlAttr.Width, "100%");
      html.AddAttribute(HtmlAttr.Align, "center");
      html.AddAttribute(HtmlAttr.Class, "entry");
      html.RenderBeginTag(HtmlTag.Td);

      html.AddAttribute(HtmlAttr.Width, bmp.Width.ToString());
      html.AddAttribute(HtmlAttr.Height, bmp.Height.ToString());
      html.AddAttribute(HtmlAttr.Src, fileName);
      html.RenderBeginTag(HtmlTag.Img);
      html.RenderEndTag();

      html.RenderEndTag();
      html.RenderEndTag();

      html.RenderEndTag();
      html.RenderEndTag();
      html.RenderEndTag();
      html.RenderEndTag();

      bmp.Dispose();
    }

    private void RenderBarGraph(BarGraph graph, HtmlTextWriter html)
    {
      BarGraphRenderer barGraph = new BarGraphRenderer(Color.White);

      barGraph.RenderMode = graph.RenderMode;

      barGraph._regions = graph.Regions;
      barGraph.SetTitles(graph.xTitle, null);

      if (graph.yTitle != null)
        barGraph.VerticalLabel = graph.yTitle;

      barGraph.FontColor = Color.Black;
      barGraph.ShowData = graph.Interval == 1;
      barGraph.VerticalTickCount = graph.Ticks;

      string[] labels = new string[graph.Items.Count];
      string[] values = new string[graph.Items.Count];

      for (int i = 0; i < graph.Items.Count; ++i)
      {
        ChartItem item = graph.Items[i];

        labels[i] = item.Name;
        values[i] = item.Value.ToString();
      }

      barGraph._interval = graph.Interval;
      barGraph.CollectDataPoints(labels, values);

      Bitmap bmp = barGraph.Draw();

      string fileName = graph.FileName + ".png";
      bmp.Save(Path.Combine(m_OutputDirectory, fileName), ImageFormat.Png);

      html.Write("<!-- ");

      html.AddAttribute(HtmlAttr.Href, "#");
      html.AddAttribute(HtmlAttr.Onclick,
        $"javascript:window.open('{SafeFileName(FindNameFrom(graph))}.html','ChildWindow','width={bmp.Width + 30},height={bmp.Height + 80},resizable=no,status=no,toolbar=no')");
      html.RenderBeginTag(HtmlTag.A);
      html.Write(graph.Name);
      html.RenderEndTag();

      html.Write(" -->");

      html.AddAttribute(HtmlAttr.Cellpadding, "0");
      html.AddAttribute(HtmlAttr.Cellspacing, "0");
      html.AddAttribute(HtmlAttr.Border, "0");
      html.RenderBeginTag(HtmlTag.Table);

      html.RenderBeginTag(HtmlTag.Tr);
      html.AddAttribute(HtmlAttr.Class, "tbl-border");
      html.RenderBeginTag(HtmlTag.Td);

      html.AddAttribute(HtmlAttr.Width, "100%");
      html.AddAttribute(HtmlAttr.Cellpadding, "4");
      html.AddAttribute(HtmlAttr.Cellspacing, "1");
      html.RenderBeginTag(HtmlTag.Table);

      html.RenderBeginTag(HtmlTag.Tr);

      html.AddAttribute(HtmlAttr.Colspan, "10");
      html.AddAttribute(HtmlAttr.Width, "100%");
      html.AddAttribute(HtmlAttr.Align, "center");
      html.AddAttribute(HtmlAttr.Class, "header");
      html.RenderBeginTag(HtmlTag.Td);
      html.Write(graph.Name);
      html.RenderEndTag();
      html.RenderEndTag();

      html.RenderBeginTag(HtmlTag.Tr);

      html.AddAttribute(HtmlAttr.Colspan, "10");
      html.AddAttribute(HtmlAttr.Width, "100%");
      html.AddAttribute(HtmlAttr.Align, "center");
      html.AddAttribute(HtmlAttr.Class, "entry");
      html.RenderBeginTag(HtmlTag.Td);

      html.AddAttribute(HtmlAttr.Width, bmp.Width.ToString());
      html.AddAttribute(HtmlAttr.Height, bmp.Height.ToString());
      html.AddAttribute(HtmlAttr.Src, fileName);
      html.RenderBeginTag(HtmlTag.Img);
      html.RenderEndTag();

      html.RenderEndTag();
      html.RenderEndTag();

      html.RenderEndTag();
      html.RenderEndTag();
      html.RenderEndTag();
      html.RenderEndTag();

      bmp.Dispose();
    }

    private void RenderReport(Report report, HtmlTextWriter html)
    {
      html.AddAttribute(HtmlAttr.Width, report.Width);
      html.AddAttribute(HtmlAttr.Cellpadding, "0");
      html.AddAttribute(HtmlAttr.Cellspacing, "0");
      html.AddAttribute(HtmlAttr.Border, "0");
      html.RenderBeginTag(HtmlTag.Table);

      html.RenderBeginTag(HtmlTag.Tr);
      html.AddAttribute(HtmlAttr.Class, "tbl-border");
      html.RenderBeginTag(HtmlTag.Td);

      html.AddAttribute(HtmlAttr.Width, "100%");
      html.AddAttribute(HtmlAttr.Cellpadding, "4");
      html.AddAttribute(HtmlAttr.Cellspacing, "1");
      html.RenderBeginTag(HtmlTag.Table);

      html.RenderBeginTag(HtmlTag.Tr);
      html.AddAttribute(HtmlAttr.Colspan, "10");
      html.AddAttribute(HtmlAttr.Width, "100%");
      html.AddAttribute(HtmlAttr.Align, "center");
      html.AddAttribute(HtmlAttr.Class, "header");
      html.RenderBeginTag(HtmlTag.Td);
      html.Write(report.Name);
      html.RenderEndTag();
      html.RenderEndTag();

      bool isNamed = false;

      for (int i = 0; i < report.Columns.Count && !isNamed; ++i)
        isNamed = report.Columns[i].Name != null;

      if (isNamed)
      {
        html.RenderBeginTag(HtmlTag.Tr);

        for (int i = 0; i < report.Columns.Count; ++i)
        {
          ReportColumn column = report.Columns[i];

          html.AddAttribute(HtmlAttr.Class, "header");
          html.AddAttribute(HtmlAttr.Width, column.Width);
          html.AddAttribute(HtmlAttr.Align, column.Align);
          html.RenderBeginTag(HtmlTag.Td);

          html.Write(column.Name);

          html.RenderEndTag();
        }

        html.RenderEndTag();
      }

      for (int i = 0; i < report.Items.Count; ++i)
      {
        ReportItem item = report.Items[i];

        html.RenderBeginTag(HtmlTag.Tr);

        for (int j = 0; j < item.Values.Count; ++j)
        {
          if (!isNamed && j == 0)
            html.AddAttribute(HtmlAttr.Width, report.Columns[j].Width);

          html.AddAttribute(HtmlAttr.Align, report.Columns[j].Align);
          html.AddAttribute(HtmlAttr.Class, "entry");
          html.RenderBeginTag(HtmlTag.Td);

          if (item.Values[j].Format == null)
            html.Write(item.Values[j].Value);
          else
            html.Write(int.Parse(item.Values[j].Value).ToString(item.Values[j].Format));

          html.RenderEndTag();
        }

        html.RenderEndTag();
      }

      html.RenderEndTag();
      html.RenderEndTag();
      html.RenderEndTag();
      html.RenderEndTag();
    }
  }
}