319 lines
17 KiB
Swift
319 lines
17 KiB
Swift
import SwiftUI
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/// Alerts tab — enables the cheapest-station proximity alerts. The fuel being
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/// monitored is chosen HERE, independently of the Stations-tab selection:
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/// users can browse any fuel without re-targeting their alerts (and vice
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/// versa). The Live Activity section also lives here — it mirrors this page's
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/// shape (toggle + fuel + distance) so the two "notify me while driving"
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/// surfaces sit together. Geofence plumbing (count, 18-limit) lives in
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/// Settings → Debug; the user-facing page keeps short descriptions that follow
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/// the selected alert type and radius, plus a 0-stations hint.
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struct AlertsView: View {
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@Binding var enabled: Bool
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@Binding var radius: Double // stored in km (monitor + storage)
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@Binding var fuel: FuelType // the fuel alerts monitor for
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@Binding var alertMode: AlertMode
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/// Read-only here: the threshold is edited in Settings → Fuel Savings, where
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/// the fill size and MPG that decide the saving live. Read back so the
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/// alert's own rule is visible without leaving the tab.
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let bestValueThresholdGBP: Double
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let bestValueConfigured: Bool
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@Binding var favouriteDropEnabled: Bool
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@Binding var favouriteDropFuel: FuelType
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/// Whether alerts mirror the Stations-tab search distance (capped at 8 mi).
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@Binding var followsSearch: Bool
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/// Whether the "cheapest nearby" Live Activity is shown on the Lock Screen
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/// / Dynamic Island. Tracks its OWN fuel + radius (below) — independent of
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/// the Stations tab.
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@Binding var liveActivityEnabled: Bool
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/// Fuel the Live Activity tracks (independent of the Stations tab).
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@Binding var liveActivityFuel: FuelType
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/// Search radius (miles, 5/10/15) the Live Activity uses.
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@Binding var liveActivityRadiusMiles: Int
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/// Whether the Live Activity mirrors the Stations-tab search distance.
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@Binding var liveActivityFollowsSearch: Bool
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/// Current Stations-tab search distance (miles) — the value "Follow search"
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/// mirrors.
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let stationLimit: Int
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let distanceUnit: DistanceUnit
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let monitoredCount: Int
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let lastAlert: String?
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let onCheckFavouriteDropNow: () -> Void
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/// The Stations-tab search distance shown in the user's unit, e.g.
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/// "5 miles" or "8 km" — for the "Follow search" rows.
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private var searchInUnitLabel: String {
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let shown = distanceUnit.displayMiles(stationLimit) // stationLimit is always miles
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return String(format: String(localized: "%lld %@", comment: "Distance label"), shown, distanceUnit.label(for: Double(shown)))
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}
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/// A miles value (5/10/15) shown truthfully in the user's unit, e.g.
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/// "5 miles" (miles unit) or "8 km" (km unit) — picker labels must match
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/// what the option really means.
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private func distanceLabel(forMiles miles: Int) -> String {
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let shown = distanceUnit.displayMiles(miles)
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return String(format: String(localized: "%lld %@", comment: "Distance label"), shown, distanceUnit.label(for: Double(shown)))
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}
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/// The distance the geofence actually caps "Follow search" at, in miles
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/// (FuelStore stores the cap in km so the monitor and storage are unit-free).
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private var followSearchCapMiles: Int {
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Int((FuelStore.alertFollowCapKM / FuelSavingsCalculator.kilometresPerMile).rounded())
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}
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/// What the selected alert type actually does. Swapped with the picker so
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/// the copy can never describe the wrong mode.
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private var alertModeDescription: String {
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switch alertMode {
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case .cheapest:
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return String(localized: "Get notified when you're near one of the cheapest stations for your chosen fuel.", comment: "Cheapest station proximity alert description")
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case .bestValue:
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return String(localized: "Get notified when you're near a station that could save you money after travel costs.", comment: "Best Value proximity alert description")
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}
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}
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/// The radius the selected option really monitors, stated in the user's
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/// unit — e.g. "Get alerts when you're within 2 miles of a matching
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/// station." "Follow search" mirrors the Stations-tab distance, which the
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/// geofence caps; said plainly, and only when the search distance really
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/// exceeds the cap, so the sentence never contradicts the picker row.
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private var alertRadiusDescription: String {
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switch alertChoice.wrappedValue {
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case .followSearch:
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let capped = stationLimit > followSearchCapMiles
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let label = distanceLabel(forMiles: capped ? followSearchCapMiles : stationLimit)
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if capped {
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return String(format: String(localized: "Get alerts when you're within %@ of a matching station (your search distance is capped for reliable alerts).", comment: "Proximity alert radius description, follow search capped"), label)
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}
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return String(format: String(localized: "Get alerts when you're within %@ of a matching station.", comment: "Proximity alert radius description"), label)
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case .fixed(let value):
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let label = String(format: String(localized: "%lld %@", comment: "Distance label"), value, distanceUnit.label(for: Double(value)))
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return String(format: String(localized: "Get alerts when you're within %@ of a matching station.", comment: "Proximity alert radius description"), label)
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}
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}
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private enum AlertRadiusChoice: Hashable {
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case followSearch
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case fixed(Int)
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}
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/// The radius picker works in the user's chosen unit; the stored value
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/// stays km so ProximityMonitor and persistence never change. Options are
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/// snapped to the nearest picker value so any stored radius still selects.
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/// "Follow search" mirrors the Stations-tab distance (capped at 8 miles).
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private var alertChoice: Binding<AlertRadiusChoice> {
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Binding(
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get: {
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if followsSearch { return .followSearch }
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let inUnit = distanceUnit.fromKM(radius)
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let snapped = FuelStore.alertRadiusOptions
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.min(by: { abs(Double($0) - inUnit) < abs(Double($1) - inUnit) }) ?? 3
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return .fixed(snapped)
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},
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set: { choice in
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switch choice {
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case .followSearch:
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followsSearch = true
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case .fixed(let value):
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followsSearch = false
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radius = distanceUnit.toKM(Double(value))
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}
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}
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)
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}
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private enum LADistanceChoice: Hashable {
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case followSearch
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case fixed(Int)
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}
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private var laChoice: Binding<LADistanceChoice> {
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Binding(
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get: {
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if liveActivityFollowsSearch { return .followSearch }
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return .fixed(liveActivityRadiusMiles)
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},
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set: { choice in
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switch choice {
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case .followSearch:
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liveActivityFollowsSearch = true
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case .fixed(let miles):
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liveActivityFollowsSearch = false
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liveActivityRadiusMiles = miles
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}
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}
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)
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}
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/// The radius currently selected, in the user's unit — shown by the disabled
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/// row in place of the picker.
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private var alertRadiusValueLabel: String {
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switch alertChoice.wrappedValue {
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case .followSearch:
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return String(format: String(localized: "Follow search (%@)", comment: "Follow current station search distance option"), searchInUnitLabel)
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case .fixed(let value):
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return String(format: String(localized: "%lld %@", comment: "Distance label"), value, distanceUnit.label(for: Double(value)))
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}
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}
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private var laDistanceValueLabel: String {
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switch laChoice.wrappedValue {
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case .followSearch:
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return String(format: String(localized: "Follow search (%@)", comment: "Follow current station search distance option"), searchInUnitLabel)
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case .fixed(let miles):
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return distanceLabel(forMiles: miles)
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}
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}
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/// An option row that belongs to a toggle. When the toggle is off the control
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/// is replaced by a dimmed, static value row: `.disabled` is not enough here
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/// because an inline-style picker in a List still expands its options when
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/// tapped while disabled.
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@ViewBuilder
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private func optionRow<Content: View>(_ title: String,
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value: String,
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isEnabled: Bool,
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@ViewBuilder picker: () -> Content) -> some View {
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if isEnabled {
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picker()
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} else {
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HStack {
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Text(title)
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Spacer()
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Text(value)
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}
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.foregroundStyle(.tertiary)
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}
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}
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var body: some View {
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NavigationStack {
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List {
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Section {
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Toggle(String(localized: "Cheapest favourite", comment: "Favourite price-drop alert toggle"), isOn: $favouriteDropEnabled)
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optionRow(String(localized: "Fuel", comment: "Fuel picker title"),
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value: favouriteDropFuel.displayName,
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isEnabled: favouriteDropEnabled) {
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Picker(String(localized: "Fuel", comment: "Fuel picker title"), selection: $favouriteDropFuel) {
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ForEach(FuelType.allCases) { fuel in
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Text(fuel.displayName).tag(fuel)
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}
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}
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}
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Button(String(localized: "Check now", comment: "Manual favourite price-drop check button"), action: onCheckFavouriteDropNow)
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.disabled(!favouriteDropEnabled)
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.allowsHitTesting(favouriteDropEnabled)
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Text(String(localized: "Get notified when a different favourite becomes the cheapest, or your cheapest favourite drops in price.", comment: "Favourite price alerts section description"))
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.font(.footnote)
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.foregroundStyle(.secondary)
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} header: {
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Text(String(localized: "Favourite price alerts", comment: "Favourite price alerts section title"))
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}
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Section {
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Toggle(String(localized: "Cheapest station", comment: "Proximity alert toggle"), isOn: $enabled)
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optionRow(String(localized: "Alert type", comment: "Proximity alert type picker title"),
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value: alertMode.displayName,
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isEnabled: enabled) {
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Picker(String(localized: "Alert type", comment: "Proximity alert type picker title"), selection: $alertMode) {
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ForEach(AlertMode.allCases.filter { mode in mode != .bestValue || bestValueConfigured }) { mode in
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Text(mode.displayName).tag(mode)
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}
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}
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}
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if !bestValueConfigured {
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Text(String(localized: "Set up Best Value first so Best Value alerts can account for your fill size, MPG and travel cost.", comment: "Best Value alert unavailable hint"))
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.font(.footnote)
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.foregroundStyle(.secondary)
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}
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Text(alertModeDescription)
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.font(.footnote)
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.foregroundStyle(.secondary)
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if alertMode == .bestValue {
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// The threshold is edited in Settings → Fuel Savings: it
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// labels station rows BEST VALUE as well as gating this
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// alert, so it lives with the fill size and MPG that
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// produce the saving. Read back here, not offered twice.
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Text(String(format: String(localized: "Minimum saving %@ — change in Settings, Fuel Savings.", comment: "Best Value alert threshold read-back"), FuelSavingsFormat.money(bestValueThresholdGBP)))
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.font(.footnote)
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.foregroundStyle(.secondary)
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}
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optionRow(String(localized: "Fuel", comment: "Fuel picker title"),
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value: fuel.displayName,
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isEnabled: enabled) {
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Picker(String(localized: "Fuel", comment: "Fuel picker title"), selection: $fuel) {
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ForEach(FuelType.allCases) { fuel in
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Text(fuel.displayName).tag(fuel)
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}
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}
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}
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optionRow(String(localized: "Radius", comment: "Alert radius picker title"),
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value: alertRadiusValueLabel,
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isEnabled: enabled) {
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Picker(String(localized: "Radius", comment: "Alert radius picker title"), selection: alertChoice) {
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Text(String(format: String(localized: "Follow search (%@)", comment: "Follow current station search distance option"), searchInUnitLabel)).tag(AlertRadiusChoice.followSearch)
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ForEach(FuelStore.alertRadiusOptions, id: \.self) { value in
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Text(String(format: String(localized: "%lld %@", comment: "Distance label"), value, distanceUnit.label(for: Double(value)))).tag(AlertRadiusChoice.fixed(value))
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}
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}
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}
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Text(alertRadiusDescription)
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.font(.footnote)
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.foregroundStyle(.secondary)
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if enabled && monitoredCount == 0 {
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Text(String(localized: "No stations monitored yet — open the Stations tab to load prices first.", comment: "No monitored stations hint"))
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.font(.footnote)
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.foregroundStyle(.secondary)
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}
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Text(String(localized: "Background alerts depend on when your iPhone allows them; each station alerts at most once an hour.", comment: "Proximity alerts background limitation note"))
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.font(.footnote)
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.foregroundStyle(.secondary)
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} header: {
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Text(String(localized: "Proximity alerts", comment: "Proximity alerts section title"))
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}
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if enabled, let lastAlert {
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Section(String(localized: "Last alert", comment: "Last alert section title")) {
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Label(lastAlert, systemImage: "bell.badge.fill")
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.font(.footnote)
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}
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}
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Section {
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Toggle(String(localized: "Cheapest station", comment: "Live Activity toggle"), isOn: $liveActivityEnabled)
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optionRow(String(localized: "Fuel", comment: "Fuel picker title"),
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value: liveActivityFuel.displayName,
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isEnabled: liveActivityEnabled) {
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Picker(String(localized: "Fuel", comment: "Fuel picker title"), selection: $liveActivityFuel) {
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ForEach(FuelType.allCases) { fuel in
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Text(fuel.displayName).tag(fuel)
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}
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}
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}
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optionRow(String(localized: "Distance", comment: "Distance picker title"),
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value: laDistanceValueLabel,
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isEnabled: liveActivityEnabled) {
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Picker(String(localized: "Distance", comment: "Distance picker title"), selection: laChoice) {
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Text(String(format: String(localized: "Follow search (%@)", comment: "Follow current station search distance option"), searchInUnitLabel)).tag(LADistanceChoice.followSearch)
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ForEach(FuelStore.stationRadiusOptions, id: \.self) { miles in
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Text(distanceLabel(forMiles: miles)).tag(LADistanceChoice.fixed(miles))
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}
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}
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}
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if liveActivityFollowsSearch {
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Text(String(localized: "Uses the same distance as your station search.", comment: "Live Activity distance description, follow search"))
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.font(.footnote)
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.foregroundStyle(.secondary)
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}
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Text(String(localized: "See the cheapest nearby station on your Lock Screen and Dynamic Island, with updates as you travel.", comment: "Live Activity section description"))
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.font(.footnote)
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.foregroundStyle(.secondary)
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} header: {
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Text(String(localized: "Live Activity", comment: "Live Activity section title"))
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}
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}
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.navigationTitle(String(localized: "Alerts", comment: "Alerts tab title"))
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}
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}
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}
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