﻿using Esri.ArcGISRuntime.Controls;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Layers;
using System;
using System.Collections.Generic;
using Windows.UI.Popups;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

namespace ArcGISRuntime.Samples.Store.Samples
{
	/// <summary>
	/// This sample demonstrates the Stretch raster function.
	/// </summary>
	/// <title>Stretch</title>
	/// <category>Dynamic Service Layers</category>
	public sealed partial class Stretch : Page
	{
		public Stretch()
		{
			this.InitializeComponent();
			MyMapView.Map.InitialViewpoint =
				new Viewpoint(new Envelope(-8844874, 5401062, -8828990, 5420947, SpatialReference.Create(3857)));
		}

		private void ApplyButton_Click(object sender, RoutedEventArgs e)
		{
			try
			{
				ArcGISImageServiceLayer imageLayer = MyMapView.Map.Layers["ImageServiceLayer"] as ArcGISImageServiceLayer;
				RenderingRule renderingRule = new RenderingRule();
				renderingRule.VariableName = "Raster";

				Dictionary<string, object> rasterParams = new Dictionary<string, object>();

				string[] strArray = BandIDsTextBox.Text.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

				if (strArray.Length == 1 || strArray.Length == 2 || strArray.Length > 3)
				{
					ValidBandIdsTextBlock.Visibility = Visibility.Visible;
					return;
				}
				else
					ValidBandIdsTextBlock.Visibility = Visibility.Collapsed;

				renderingRule.RasterFunctionName = "Stretch";
				renderingRule.VariableName = "Raster";

				int stretchType = 0;
				if (StandardDevCheckBox.IsChecked.Value)
					stretchType = 3;
				else if (HistogramCheckBox.IsChecked.Value)
					stretchType = 4;
				else if (MinMaxCheckBox.IsChecked.Value)
					stretchType = 5;

				rasterParams.Add("StretchType", stretchType);
				rasterParams.Add("NumberOfStandardDeviations",
					string.IsNullOrEmpty(StnDevTextBox.Text) ? 1 : double.Parse(StnDevTextBox.Text));

				double[][] statistics = new double[3][] { 
					new double[4] { 0.2, 222.46, 99.35, 1.64 }, 
					new double[4] { 5.56, 100.345, 45.4, 3.96 }, 
					new double[4] { 0, 352.37, 172.284, 2 } };
				rasterParams.Add("Statistics", statistics);

				double[] gamma = new double[] { 1.25, 2, 3.95 };
				rasterParams.Add("Gamma", gamma);


				int[] numArray = new int[strArray.Length];
				for (int i = 0; i < strArray.Length; i++)
				{
					numArray[i] = int.Parse(strArray[i]);
				}

				imageLayer.BandIds = numArray.Length < 1 ? null : numArray;


				renderingRule.RasterFunctionArguments = rasterParams;
				imageLayer.RenderingRule = renderingRule;
			}
			catch (Exception ex)
			{
				var _x = new MessageDialog(ex.Message, "Sample Error").ShowAsync();
			}
		}
	}
}
