Trace utility network

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// Copyright 2023 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 TraceUtilityNetworkView: View {
    /// The view model for the sample.
    @StateObject var model = Model()

    var body: some View {
        MapViewReader { mapViewProxy in
            MapView(
                map: model.map,
                viewpoint: .initialViewpoint,
                graphicsOverlays: [model.points]
            )
            .onSingleTapGesture { screenPoint, mapPoint in
                model.lastSingleTap = (screenPoint, mapPoint)
            }
            .selectionColor(.yellow)
            .onDisappear {
                ArcGISEnvironment.authenticationManager.arcGISCredentialStore.removeAll()
            }
            .overlay(alignment: .center) {
                if model.tracingActivity == .traceRunning,
                   let type = model.pendingTraceParameters?.traceType {
                    VStack {
                        Text("Running \(String(describing: type)) trace...")
                        ProgressView()
                            .progressViewStyle(.circular)
                    }
                    .padding(6)
                    .background(.thinMaterial)
                    .cornerRadius(10)
                }
            }
            .overlay(alignment: .top) {
                if let hint = model.hint {
                    Text(hint)
                        .frame(maxWidth: .infinity)
                        .padding(.vertical, 6)
                        .background(.thinMaterial, ignoresSafeAreaEdges: .horizontal)
                }
            }
            .task {
                await model.setup()
            }
            .task(id: model.lastSingleTap?.mapPoint) {
                guard case .settingPoints = model.tracingActivity,
                      let lastSingleTap = model.lastSingleTap else {
                    return
                }
                if let feature = try? await mapViewProxy.identifyLayers(
                    screenPoint: lastSingleTap.screenPoint,
                    tolerance: 10
                ).first?.geoElements.first as? ArcGISFeature {
                    model.add(feature, at: lastSingleTap.mapPoint)
                }
            }
            .task(id: model.tracingActivity) {
                model.updateUserHint()
                if model.tracingActivity == .traceRunning {
                    do {
                        try await model.trace()
                        model.tracingActivity = .traceCompleted
                    } catch {
                        model.tracingActivity = .traceFailed(description: error.localizedDescription)
                    }
                }
            }
            .toolbar {
                ToolbarItemGroup(placement: .bottomBar) {
                    traceMenu
                }
            }
        }
    }
}

extension TraceUtilityNetworkView {
    /// The trace types supported for this sample.
    var supportedTraceTypes: [UtilityTraceParameters.TraceType] {
        return [.connected, .subnetwork, .upstream, .downstream]
    }
}

private extension Viewpoint {
    /// The initial viewpoint to be displayed when the sample is first opened.
    static var initialViewpoint: Viewpoint {
        .init(
            boundingGeometry: Envelope(
                xRange: (-9813547.35557238)...(-9813185.0602376),
                yRange: (5129980.36635111)...(5130215.41254146)
            )
        )
    }
}

#Preview {
    NavigationStack {
        TraceUtilityNetworkView()
    }
}