Add route files, show overview

CHDataManagement/Workouts/RoutePreviewView.swift

@@ -0,0 +1,87 @@
+import SwiftUI
+import CoreLocation
+
+
+struct RoutePreviewView: View {
+
+    private let iconSize: CGFloat = 150
+
+    @ObservedObject
+    var file: FileResource
+
+    @State
+    var overview: RouteOverview?
+
+    @State
+    var message: String?
+
+    @State
+    var elevation: [ElevationSample] = []
+
+    var body: some View {
+        VStack {
+            Image(systemSymbol: .map)
+                .resizable()
+                .aspectRatio(contentMode:.fit)
+                .frame(width: iconSize)
+            if let message {
+                Text(message)
+                    .font(.title)
+            } else if let overview {
+                if let start = overview.start {
+                    if let end = overview.end {
+                        Text("\(start.formatted()) - \(end.formatted()) (\(overview.duration.timeString))")
+                    } else {
+                        Text(start.formatted())
+                    }
+                }
+                Text(String(format: "%.2f km (%.0f m ascended)", overview.distance / 1000, overview.ascendedElevation))
+                Text("\(Int(overview.energy)) kcal")
+                if !elevation.isEmpty {
+                    ElevationGraph(samples: elevation)
+                        .frame(width: 500, height: 200)
+                        .padding()
+                }
+            } else {
+                Text("Loading route overview...")
+                    .font(.title)
+                ProgressView()
+                    .progressViewStyle(.circular)
+            }
+        }
+        .foregroundStyle(.secondary)
+        .onAppear { loadOverview() }
+    }
+
+    private func loadOverview() {
+        guard overview == nil && message == nil else {
+            return
+        }
+        Task {
+            guard let data = file.dataContent() else {
+                DispatchQueue.main.async {
+                    self.message = "Failed to get file data"
+                }
+                return
+            }
+            let route: WorkoutData
+            do {
+                route = try WorkoutData(data: data)
+            } catch {
+                DispatchQueue.main.async {
+                    self.message = "Failed to decode route: \(error)"
+                }
+                return
+            }
+
+            let overview = route.overview
+
+            let elevations = route.locations.map { ElevationSample(timestamp: $0.timestamp, altitude: $0.altitude) }
+
+            DispatchQueue.main.async {
+                self.overview = overview
+                self.elevation = elevations
+            }
+        }
+    }
+}