Display route layer

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// Copyright 2025 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
//
//   https://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.

import ArcGIS
import SwiftUI

struct DisplayRouteLayerView: View {
    /// A map with a topographic basemap style.
    @State private var map: Map = {
        // Set the basemap.
        let map = Map(basemapStyle: .arcGISTopographic)

        // Center the map on the United States.
        map.initialViewpoint = Viewpoint(
            latitude: 45.2281, longitude: -122.8309, scale: 57e4
        )

        return map
    }()

    /// The directions for the route.
    @State private var directions = [String]()

    /// A Boolean value indicating whether to show the directions.
    @State private var isShowingDirections = false

    /// The error shown in the error alert.
    @State private var error: Error?

    var body: some View {
        MapView(map: map)
            .task {
                do {
                    // Create a portal item with a portal using the item ID for route data in Portland, OR.
                    let portalItem = PortalItem(
                        portal: .arcGISOnline(connection: .anonymous),
                        id: .portlandRoute
                    )

                    // Create a collection of features using the item.
                    let featureCollection = FeatureCollection(item: portalItem)

                    // Set route directions using the feature collection.
                    try await setRouteDirections(using: featureCollection)

                    // Create a feature collection layer using the feature collection.
                    let featureCollectionLayer = FeatureCollectionLayer(featureCollection: featureCollection)

                    // Add the feature collection layer to the map's operational layers.
                    map.addOperationalLayer(featureCollectionLayer)
                } catch {
                    self.error = error
                }
            }
            .toolbar {
                ToolbarItem(placement: .bottomBar) {
                    Button {
                        isShowingDirections = true
                    } label: {
                        Image(systemName: "arrow.triangle.turn.up.right.diamond")
                    }
                    .disabled(directions.isEmpty)
                    .popover(isPresented: $isShowingDirections) {
                        NavigationStack {
                            List(directions, id: \.self) { direction in
                                Text(direction)
                            }
                            .navigationTitle("Directions")
                            .navigationBarTitleDisplayMode(.inline)
                            .toolbar {
                                ToolbarItem(placement: .confirmationAction) {
                                    Button("Done") {
                                        isShowingDirections = false
                                    }
                                }
                            }
                        }
                        .frame(idealWidth: 320, idealHeight: 528)
                    }
                }
            }
            .errorAlert(presentingError: $error)
    }

    /// Sets the directions for the route using the feature collection's feature table that contains turn by turn directions.
    /// - Parameter featureCollection: The feature collection.
    func setRouteDirections(using featureCollection: FeatureCollection) async throws {
        // Load the feature collection.
        try await featureCollection.load()
        // Make an array of all the feature collection tables.
        let tables = featureCollection.tables
        // Get the table that contains the turn by turn directions.
        let directionsTable = tables.first(where: { $0.tableName == "DirectionPoints" })
        // Create an array of all the features in the table.
        let features = directionsTable?.features()
        // Set the array of directions.
        directions = features?.compactMap { $0.attributes["DisplayText"] } as! [String]
    }
}

private extension PortalItem.ID {
    /// The ID for the route and directions "Portland, OR, USA — Salem, OR, USA" portal item on ArcGIS Online.
    static var portlandRoute: Self { Self("0e3c8e86b4544274b45ecb61c9f41336")! }
}

#Preview {
    DisplayRouteLayerView()
}