Perform valve isolation trace

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// Copyright 2022 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.

using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Security;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI;
using Esri.ArcGISRuntime.UtilityNetworks;

namespace ArcGIS.Samples.PerformValveIsolationTrace
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Perform valve isolation trace",
        category: "Utility network",
        description: "Run a filtered trace to locate operable features that will isolate an area from the flow of network resources.",
        instructions: "Tap on one or more features to use as filter barriers or create and set the configuration's filter barriers by selecting a category. Check or uncheck 'Include Isolated Features'. Tap 'Trace' to run a subnetwork-based isolation trace. Tap 'Reset' to clear filter barriers.",
        tags: new[] { "category comparison", "condition barriers", "filter barriers", "isolated features", "network analysis", "subnetwork trace", "trace configuration", "trace filter", "utility network" })]
    public partial class PerformValveIsolationTrace : ContentPage
    {
        // Feature service for an electric utility network in Naperville, Illinois.
        private const string FeatureServiceUrl = "https://sampleserver7.arcgisonline.com/server/rest/services/UtilityNetwork/NapervilleGas/FeatureServer";
        private const int LineLayerId = 3;
        private const int DeviceLayerId = 0;
        private UtilityNetwork _utilityNetwork;

        // For creating the default trace configuration.
        private const string DomainNetworkName = "Pipeline";
        private const string TierName = "Pipe Distribution System";
        private UtilityTraceConfiguration _configuration;

        // For creating the default starting location.
        private const string NetworkSourceName = "Gas Device";
        private const string AssetGroupName = "Meter";
        private const string AssetTypeName = "Customer";
        private const string GlobalId = "{98A06E95-70BE-43E7-91B7-E34C9D3CB9FF}";
        private UtilityElement _startingLocation;

        private UtilityTraceParameters _parameters;
        private GraphicsOverlay _barrierOverlay;

        // Task completion source for the user selected terminal.
        private TaskCompletionSource<string> _terminalCompletionSource = null;

        public PerformValveIsolationTrace()
        {
            InitializeComponent();
            _ = Initialize();
        }

        private async Task Initialize()
        {
            // As of ArcGIS Enterprise 10.8.1, using utility network functionality requires a licensed user. The following login for the sample server is licensed to perform utility network operations.
            AuthenticationManager.Current.ChallengeHandler = new ChallengeHandler(async (info) =>
            {
                try
                {
                    // WARNING: Never hardcode login information in a production application. This is done solely for the sake of the sample.
                    string sampleServer7User = "viewer01";
                    string sampleServer7Pass = "I68VGU^nMurF";

                    return await AuthenticationManager.Current.GenerateCredentialAsync(info.ServiceUri, sampleServer7User, sampleServer7Pass);
                }
                catch (Exception ex)
                {
                    System.Diagnostics.Debug.WriteLine(ex.Message);
                    return null;
                }
            });

            try
            {
                // Disable the UI.
                FilterOptions.IsVisible = false;

                // Create and load a service geodatabase that matches utility network.
                ServiceGeodatabase serviceGeodatabase = await ServiceGeodatabase.CreateAsync(new Uri(FeatureServiceUrl));

                // Create a map with layers in this utility network.
                MyMapView.Map = new Map(BasemapStyle.ArcGISStreetsNight);
                MyMapView.Map.OperationalLayers.Add(new FeatureLayer(serviceGeodatabase.GetTable(LineLayerId)));
                MyMapView.Map.OperationalLayers.Add(new FeatureLayer(serviceGeodatabase.GetTable(DeviceLayerId)));

                // Create and load the utility network.
                _utilityNetwork = await UtilityNetwork.CreateAsync(new Uri(FeatureServiceUrl), MyMapView.Map);

                // Get a trace configuration from a tier.
                UtilityDomainNetwork domainNetwork = _utilityNetwork.Definition.GetDomainNetwork(DomainNetworkName) ?? throw new ArgumentException(DomainNetworkName);
                UtilityTier tier = domainNetwork.GetTier(TierName) ?? throw new ArgumentException(TierName);
                _configuration = tier.GetDefaultTraceConfiguration();

                // Create a trace filter.
                _configuration.Filter = new UtilityTraceFilter();

                // Get a default starting location.
                UtilityNetworkSource networkSource = _utilityNetwork.Definition.GetNetworkSource(NetworkSourceName) ?? throw new ArgumentException(NetworkSourceName);
                UtilityAssetGroup assetGroup = networkSource.GetAssetGroup(AssetGroupName) ?? throw new ArgumentException(AssetGroupName);
                UtilityAssetType assetType = assetGroup.GetAssetType(AssetTypeName) ?? throw new ArgumentException(AssetTypeName);
                Guid globalId = Guid.Parse(GlobalId);
                _startingLocation = _utilityNetwork.CreateElement(assetType, globalId);

                // Create a graphics overlay.
                GraphicsOverlay overlay = new GraphicsOverlay();
                MyMapView.GraphicsOverlays.Add(overlay);

                // Display starting location.
                IEnumerable<ArcGISFeature> elementFeatures = await _utilityNetwork.GetFeaturesForElementsAsync(new List<UtilityElement> { _startingLocation });
                MapPoint startingLocationGeometry = elementFeatures.FirstOrDefault().Geometry as MapPoint;
                Symbol symbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Cross, System.Drawing.Color.LimeGreen, 25d);
                Graphic graphic = new Graphic(startingLocationGeometry, symbol);
                overlay.Graphics.Add(graphic);

                // Create a graphics overlay for barriers.
                _barrierOverlay = new GraphicsOverlay();
                MyMapView.GraphicsOverlays.Add(_barrierOverlay);

                // Create the utility trace parameters.
                _parameters = new UtilityTraceParameters(UtilityTraceType.Isolation, new[] { _startingLocation });

                // Set the starting viewpoint.
                await MyMapView.SetViewpointAsync(new Viewpoint(startingLocationGeometry, 3000));

                // Build the choice list for categories populated with the `Name` property of each `UtilityCategory` in the `UtilityNetworkDefinition`.
                CategoryPicker.ItemsSource = _utilityNetwork.Definition.Categories.ToList();
                CategoryPicker.SelectedItem = _utilityNetwork.Definition.Categories.First();

                // Enable the UI.
                FilterOptions.IsVisible = true;
            }
            catch (Exception ex)
            {
                await Application.Current.MainPage.DisplayAlert(ex.GetType().Name, ex.Message, "OK");
            }
            finally
            {
                LoadingIndicator.IsVisible = false;
            }
        }

        private async void OnTrace(object sender, EventArgs e)
        {
            try
            {
                LoadingIndicator.IsVisible = true;

                // Clear previous selection from the layers.
                MyMapView.Map.OperationalLayers.OfType<FeatureLayer>().ToList().ForEach(layer => layer.ClearSelection());

                if (CategoryPicker.SelectedItem is UtilityCategory category)
                {
                    // NOTE: UtilityNetworkAttributeComparison or UtilityCategoryComparison with Operator.DoesNotExists
                    // can also be used. These conditions can be joined with either UtilityTraceOrCondition or UtilityTraceAndCondition.
                    UtilityCategoryComparison categoryComparison = new UtilityCategoryComparison(category, UtilityCategoryComparisonOperator.Exists);

                    // Add the filter barrier.
                    _configuration.Filter = new UtilityTraceFilter() { Barriers = categoryComparison };
                }

                // Set the include isolated features property.
                _configuration.IncludeIsolatedFeatures = IncludeIsolatedFeatures.IsToggled;

                // Build parameters for isolation trace.
                UtilityTraceParameters parameters = new UtilityTraceParameters(UtilityTraceType.Isolation, new[] { _startingLocation });
                parameters.TraceConfiguration = _configuration;

                // Get the trace result from trace.
                IEnumerable<UtilityTraceResult> traceResult = await _utilityNetwork.TraceAsync(parameters);
                UtilityElementTraceResult elementTraceResult = traceResult?.FirstOrDefault() as UtilityElementTraceResult;

                // Select all the features from the result.
                if (elementTraceResult?.Elements?.Count > 0)
                {
                    foreach (FeatureLayer layer in MyMapView.Map.OperationalLayers.OfType<FeatureLayer>())
                    {
                        IEnumerable<UtilityElement> elements = elementTraceResult.Elements.Where(element => element.NetworkSource.Name == layer.FeatureTable.TableName);
                        IEnumerable<Feature> features = await _utilityNetwork.GetFeaturesForElementsAsync(elements);
                        layer.SelectFeatures(features);
                    }
                }
            }
            catch (Exception ex)
            {
                await Application.Current.MainPage.DisplayAlert(ex.GetType().Name, ex.Message, "OK");
            }
            finally
            {
                LoadingIndicator.IsVisible = false;
            }
        }

        private void OnReset(object sender, EventArgs e)
        {
            _parameters.Barriers.Clear();
            _barrierOverlay.Graphics.Clear();
            foreach (FeatureLayer layer in MyMapView.Map.OperationalLayers.OfType<FeatureLayer>())
            {
                layer.ClearSelection();
            }
        }

        private async Task<UtilityTerminal> GetTerminalAsync(IEnumerable<UtilityTerminal> terminals)
        {
            // Load the terminals into a DisplayActionSheet and await the user's selection.
            var terminalArray = terminals.Select(x => x.Name).ToArray();
            string choice = await Application.Current.MainPage.DisplayActionSheet("Choose junction.", "Cancel", null, terminalArray);
            if (terminalArray.Contains(choice))
            {
                return terminals.Single(x => x.Name == choice);
            }
            else
            {
                throw new OperationCanceledException();
            }
        }

        private void Terminal_Selected(object sender, EventArgs e)
        {
            _terminalCompletionSource.TrySetResult(TerminalPicker.SelectedItem as string);
        }

        private async void OnGeoViewTapped(object sender, Esri.ArcGISRuntime.Maui.GeoViewInputEventArgs e)
        {
            try
            {
                LoadingIndicator.IsVisible = true;

                // Identify the feature to be used.
                IEnumerable<IdentifyLayerResult> identifyResult = await MyMapView.IdentifyLayersAsync(e.Position, 10.0, false);
                ArcGISFeature feature = identifyResult?.FirstOrDefault()?.GeoElements?.FirstOrDefault() as ArcGISFeature;
                if (feature == null) { return; }

                // Create element from the identified feature.
                UtilityElement element = _utilityNetwork.CreateElement(feature);

                if (element.NetworkSource.SourceType == UtilityNetworkSourceType.Junction)
                {
                    // Select terminal for junction feature.
                    IEnumerable<UtilityTerminal> terminals = element.AssetType.TerminalConfiguration?.Terminals;
                    if (terminals?.Count() > 1)
                    {
                        element.Terminal = await GetTerminalAsync(terminals);
                    }
                }
                else if (element.NetworkSource.SourceType == UtilityNetworkSourceType.Edge)
                {
                    // Compute how far tapped location is along the edge feature.
                    if (feature.Geometry is Polyline line)
                    {
                        // Remove elevation data, FractionAlong only supports 2D lines.
                        line = line.RemoveZ() as Polyline;
                        double fraction = line.FractionAlong(e.Location, -1);

                        // Check for rare edge case where the fraction is invalid.
                        if (double.IsNaN(fraction)) { return; }

                        // Set the fraction of the utility element.
                        element.FractionAlongEdge = fraction;
                    }
                }

                // Check whether starting location or barrier is added to update the right collection and symbology.
                _parameters.Barriers.Add(element);
                Symbol symbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.X, System.Drawing.Color.OrangeRed, 25d);

                // Add a graphic for the new utility element.
                Graphic traceLocationGraphic = new Graphic(feature.Geometry as MapPoint ?? e.Location, symbol);
                _barrierOverlay.Graphics.Add(traceLocationGraphic);
            }
            catch (OperationCanceledException)
            {
                return;
            }
            catch (Exception ex)
            {
                await Application.Current.MainPage.DisplayAlert(ex.GetType().Name, ex.Message, "OK");
            }
            finally
            {
                LoadingIndicator.IsVisible = false;
            }
        }
    }
}