Add KML layer with network links

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// Copyright 2024 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 AddKMLLayerWithNetworkLinksView: View {
    /// A scene with the current air traffic in parts of Europe.
    @State private var scene: ArcGIS.Scene = {
        let scene = Scene(basemapStyle: .arcGISImagery)

        // Creates a KML dataset from a remote KMZ file.
        let kmlDataset = KMLDataset(url: .radarKMZFile)

        // Creates a KML layer from the dataset and adds it to the scene's operational layers.
        let kmlLayer = KMLLayer(dataset: kmlDataset)
        scene.addOperationalLayer(kmlLayer)

        // Sets the viewpoint to be initially centered on the data coverage.
        scene.initialViewpoint = Viewpoint(latitude: 50.472421, longitude: 8.150526, scale: 1e7)

        return scene
    }()

    /// The messages from the KML dataset's network links.
    @State private var networkLinkMessages: [String] = []

    /// A Boolean value indicating whether network link messages popover is showing.
    @State private var isShowingMessages = false

    var body: some View {
        SceneView(scene: scene)
            .toolbar {
                ToolbarItem(placement: .bottomBar) {
                    Button("Network Link Messages") {
                        isShowingMessages = true
                    }
                    .popover(isPresented: $isShowingMessages) { [networkLinkMessages] in
                        MessagesList(messages: networkLinkMessages)
                            .presentationDetents([.fraction(0.5), .large])
                            .frame(idealWidth: 320, idealHeight: 380)
                    }
                }
            }
            .task {
                // Listens for new KML network link messages.
                let kmlLayer = scene.operationalLayers.first as! KMLLayer

                for await (_, message) in kmlLayer.dataset.networkLinkMessages {
                    networkLinkMessages.append(message)
                }
            }
    }

    /// A list of KML network link messages.
    private struct MessagesList: View {
        /// The messages to show in the list.
        let messages: [String]

        /// The action to dismiss the view.
        @Environment(\.dismiss) private var dismiss

        var body: some View {
            NavigationStack {
                List(messages, id: \.self) { message in
                    Text(message)
                }
                .navigationTitle("Network Link Messages")
                .navigationBarTitleDisplayMode(.inline)
                .toolbar {
                    ToolbarItem(placement: .confirmationAction) {
                        Button("Done") { dismiss() }
                    }
                }
            }
        }
    }
}

private extension URL {
    /// The web URL to the "radar" KMZ file containing network links for the current air traffic in parts of Europe.
    static var radarKMZFile: URL {
        URL(string: "https://www.arcgis.com/sharing/rest/content/items/600748d4464442288f6db8a4ba27dc95/data")!
    }
}

#Preview {
    AddKMLLayerWithNetworkLinksView()
}