Tabs (Stations/Favourites/Alerts): favourites with cheapest-first ranking, proximity geofence alerts (favourites priority, 3km default radius, 1h dedup), Always location + background mode

2026-08-11 15:17:26 +01:00
parent 54403ed4b3
commit 60d25164d6
7 changed files with 591 additions and 136 deletions
@@ -0,0 +1,85 @@
+import SwiftUI
+
+/// Favourites tab — starred stations, ranked cheapest-first for the selected
+/// fuel, with the cheapest favourite called out at the top.
+struct FavouritesView: View {
+    let favourites: [FuelStation]
+    let selectedFuel: FuelType
+    let location: Coordinate?
+    let favouriteIDs: Set<String>
+    var onToggleFavourite: (FuelStation) -> Void = { _ in }
+
+    /// Favourites that sell the selected fuel, cheapest first (distance tiebreak).
+    private var ranked: [FuelStation] {
+        let available = favourites.filter { $0.prices[selectedFuel] != nil }
+        return available.sorted { lhs, rhs in
+            let lPrice = lhs.prices[selectedFuel]!
+            let rPrice = rhs.prices[selectedFuel]!
+            if lPrice != rPrice { return lPrice < rPrice }
+            guard let location else { return false }
+            return lhs.distanceKM(to: location.lat, lng2: location.lng) <
+                   rhs.distanceKM(to: location.lat, lng2: location.lng)
+        }
+    }
+
+    private var cheapest: FuelStation? { ranked.first }
+    private var cheapestPrice: Double? { cheapest?.prices[selectedFuel] }
+
+    var body: some View {
+        NavigationStack {
+            List {
+                if favourites.isEmpty {
+                    Section {
+                        VStack(spacing: 10) {
+                            Image(systemName: "star")
+                                .font(.system(size: 40))
+                                .foregroundStyle(.secondary)
+                            Text("No favourites yet")
+                                .font(.headline)
+                            Text("Tap the star on any station in the Stations tab to pin it here, ranked by which is cheapest.")
+                                .font(.caption)
+                                .foregroundStyle(.secondary)
+                                .multilineTextAlignment(.center)
+                        }
+                        .frame(maxWidth: .infinity)
+                        .padding(.vertical, 24)
+                    }
+                } else {
+                    Section {
+                        if let cheapest, let price = cheapestPrice {
+                            HStack(spacing: 10) {
+                                Image(systemName: "crown.fill")
+                                    .foregroundStyle(.yellow)
+                                Text("Cheapest favourite: \(cheapest.name) — \(String(format: "%.1fp", price))")
+                                    .font(.footnote)
+                            }
+                        }
+                    }
+
+                    Section("Favourites — cheapest first") {
+                        ForEach(Array(ranked.enumerated()), id: \.element.id) { index, station in
+                            StationRow(
+                                station: station,
+                                fuel: selectedFuel,
+                                location: location,
+                                cheapestPrice: cheapestPrice,
+                                isTopResult: index == 0,
+                                isFavourite: favouriteIDs.contains(station.id),
+                                onToggleFavourite: { onToggleFavourite(station) }
+                            )
+                        }
+                    }
+
+                    if let cheapest = cheapest {
+                        Section {
+                            Text("\(cheapest.name) is your cheapest favourite for \(selectedFuel.displayName). Add the same stations to the Alerts tab to get pinged when you drive past a cheaper one.")
+                                .font(.caption)
+                                .foregroundStyle(.secondary)
+                        }
+                    }
+                }
+            }
+            .navigationTitle("Favourites")
+        }
+    }
+}