using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Web.Mvc;
using System.Web.UI.DataVisualization.Charting;
using System.Web.UI.WebControls;
using LeafWeb.Core.Charter;
using LeafWeb.Core.Entities;
using LeafWeb.Core.Parsers;
using LeafWeb.Web.Charter;

namespace LeafWeb.Web.Controllers
{
	public class LeafCharterController : ControllerBase
	{
		public ActionResult Index(int leafInputId)
		{
			var hasLeafOutputFile =
				DataService
				.GetLeafInput(leafInputId)?
				.OutputFiles?
				.FirstOrDefault(f => f.IsLeafChartFile) != null;

			return View(leafInputId);
		}

	    public ActionResult LeafCharts(int leafInputId)
	    {
		    var leafOutputFile = 
				DataService
				.GetLeafInput(leafInputId)?
				.OutputFiles?
				.FirstOrDefault(f => f.IsLeafChartFile);

		    if (leafOutputFile == null)
			    throw new ArgumentOutOfRangeException(); // TODO: break

		    var curveData = GetCurveData(leafOutputFile.Contents);

			var charts = GetChartBitmaps(curveData).ToList();

		    var combinedChart = CombineBitmaps(charts);

		    foreach (var chart in charts) chart.Dispose(); // cleanup

			using (var ms = new MemoryStream())
		    {
				combinedChart.Save(ms, ImageFormat.Png);
			    ms.Seek(0, SeekOrigin.Begin);
				return File(ms.ToArray(), "image/png", "mychart.png");
			}
		}

		private CurveData[] GetCurveData(byte[] fileContents)
		{
			LeafGasComparison[] leafGasComparisons;
			using (var parser = new LeafGasComparisonParser(fileContents))
				leafGasComparisons = parser.Parse();

			return CurveDataConverter.Convert(leafGasComparisons).ToArray();
		}

		private IEnumerable<Bitmap> GetChartBitmaps(CurveData[] curveData)
		{
			var charts = LeafWebCharter.ProduceCharts(curveData[0]);
			
			foreach (var chart in charts)
			{
				// http://stackoverflow.com/a/336396/99492
				var ms = new MemoryStream(); // this gets attached to the bmp, dispose of it later
				chart.SaveImage(ms, ChartImageFormat.Bmp);
				ms.Seek(0, SeekOrigin.Begin);
				yield return new Bitmap(ms);
			}
		}

		private Bitmap CombineBitmaps(IList<Bitmap> bitmaps, int columnCount = 2)
		{
			var cellWidth = bitmaps[0].Width;
			var cellHeight = bitmaps[0].Height;
			var width = cellWidth * 2;
			var height = cellHeight * bitmaps.Count / 2;

			var combinedBitmap = new Bitmap(width, height);
			using (var g = Graphics.FromImage(combinedBitmap))
			{
				var currentCol = 0;
				var currentRow = 0;
				foreach (var image in bitmaps)
				{
					g.DrawImage(image, currentCol * cellWidth, currentRow * cellHeight);

					currentCol = (currentCol + 1)%columnCount;
					currentRow += currentCol == 0 ? 1 : 0;
				}
			}
			return combinedBitmap;
		}

		public ActionResult ChartSample()
		{
			var chart = new Chart
			{
				BackColor = Color.FromArgb(255, 255, 255),
				Width = Unit.Pixel(250),
				Height = Unit.Pixel(2500)
			};

			var series = new Series
			{
				ChartArea = "ca1",
				ChartType = SeriesChartType.Line
			};

			//series.Font = new Font("Verdana", 8.25f, FontStyle.Regular);

			var myRandom = new Random();

			for (int i = 0; i < 100; i++)
			{
				var dp = new DataPoint();
				dp.AxisLabel = String.Format("{0}-{1}", i, Guid.NewGuid().ToString().Substring(0, 4));
				dp.YValues = new double[] { myRandom.Next(5, 100) };
				series.Points.Add(dp);
			}


			chart.Series.Add(series);

			var area = new ChartArea("ca1");
			area.Area3DStyle.Enable3D = false;
			area.AxisX.Interval = 1;
			//area.BackColor = Color.Transparent;
			//var labelStyle = new LabelStyle();
			//labelStyle.Enabled = true;
			//labelStyle.Font = new Font("Arial", 3f);
			area.AxisX.LabelStyle.Font = new Font("Verdana", 8.25f, FontStyle.Underline);//Why does it recognize the style but not the font!!!???

			chart.ChartAreas.Add(area);

			using (var ms = new MemoryStream())
			{
				chart.SaveImage(ms, ChartImageFormat.Png);
				ms.Seek(0, SeekOrigin.Begin);

				return File(ms.ToArray(), "image/png", "mychart.png");
			}
		}
	}
}