230 lines
8.9 KiB
Swift
230 lines
8.9 KiB
Swift
import AppIntents
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import SwiftUI
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/// Siri / Shortcuts surface for "cheapest [fuel] near me".
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///
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/// Design (see skill reference `siri-app-intents-scope.md`):
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/// - App Intents (iOS 16+), no entitlements/capabilities/Info.plist keys.
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/// - Cached-data-first: answers from the full-UK dump saved in the app-group
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/// defaults by the normal app fetch, SCOPED to the app's saved search radius
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/// (5/10/15 mi) so "near me" really means near me. The dialog ALWAYS labels
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/// data age ("as of 6:30 AM") — silent stale answers are a trust killer for
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/// fuel prices. The fresh-data path (relay baseURL is LAN-only) is a P0
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/// dependency; until it lands, off-LAN answers use whatever the phone
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/// last fetched at home.
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/// - Location: last-known location fallback (background CoreLocation from a
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/// Siri-launched process is slow/unreliable).
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/// - Phrases stay literal/boring for App Store review; `\.applicationName`
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/// appears in EVERY phrase (iOS 26 metadata-processor requirement —
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/// without it the metadata exports ZERO utterances).
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/// - Fuel case labels use UK speech ("Petrol", "Super Unleaded") so Siri's
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/// phrase matching maps how people actually ask; the app UI's own
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/// FuelType.displayName ("Unleaded") is unaffected.
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// MARK: - Fuel parameter
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extension FuelType: AppEnum {
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static var typeDisplayRepresentation: TypeDisplayRepresentation = "Fuel"
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static var caseDisplayRepresentations: [FuelType: DisplayRepresentation] = [
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.e10: "Petrol",
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.e5: "Super Unleaded",
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.diesel: "Diesel",
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]
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}
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// MARK: - Intent
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struct CheapestFuelIntent: AppIntent {
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static var title: LocalizedStringResource = "Cheapest Fuel Near Me"
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static var description = IntentDescription(
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"Finds the cheapest station selling a fuel near you, using the latest cached prices."
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)
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@Parameter(title: "Fuel")
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var fuel: FuelType
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/// Plain construction — Siri resolves the fuel parameter from the
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/// utterance. Defaults to petrol if the parameter is unresolved.
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init() {
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self.fuel = .e10
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}
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/// Fixed-fuel construction for the per-fuel App Shortcuts: the fuel word
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/// becomes literal phrase text so Siri matches "unleaded"/"petrol"/
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/// "diesel" directly instead of resolving the parameter (which was flaky
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/// on-device — "cheapest diesel" matched, "cheapest unleaded" didn't).
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init(fuel: FuelType) {
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self.fuel = fuel
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}
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func perform() async throws -> some IntentResult & ProvidesDialog & ShowsSnippetView & ReturnsValue<String> {
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let stations = FuelStore.loadStations()
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guard !stations.isEmpty else {
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let dialog = "I don't have any price data yet. Open FuelBoard once to download the latest prices, then ask me again."
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return .result(
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value: "No price data yet",
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dialog: IntentDialog(stringLiteral: dialog),
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view: CheapestFuelMessage(text: "No price data yet — open FuelBoard to download prices.")
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)
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}
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guard let coordinate = FuelStore.loadLocationWithDate()?.coordinate else {
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let dialog = "I don't know your location yet. Open FuelBoard and allow location access, then ask me again."
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return .result(
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value: "Location unavailable",
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dialog: IntentDialog(stringLiteral: dialog),
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view: CheapestFuelMessage(text: "Location unavailable — open FuelBoard to share your location.")
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)
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}
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// Scope to the app's saved search radius (5/10/15 mi, default 5) so
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// "near me" really means near me — the UK-wide minimum can be hundreds
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// of miles away.
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let radiusMiles = Double(FuelStore.loadStationLimit())
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guard let station = SiriCheapestLookup.cheapest(
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in: stations,
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fuel: fuel,
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fromLat: coordinate.lat,
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lng: coordinate.lng,
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withinMiles: radiusMiles
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), let price = station.prices[fuel] else {
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let fuelName = fuel.displayName.lowercased()
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let radiusText = radiusMiles == 1 ? "1 mile" : "\(Int(radiusMiles)) miles"
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return .result(
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value: "No \(fuelName) stations within \(radiusText)",
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dialog: IntentDialog(stringLiteral: "I couldn't find any station selling \(fuelName) within \(radiusText) of you."),
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view: CheapestFuelMessage(text: "No \(fuelName) stations within \(radiusText).")
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)
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}
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let distanceKM = station.distanceKM(to: coordinate.lat, lng2: coordinate.lng)
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let distanceText = FuelStore.loadDistanceUnit().format(distanceKM)
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let priceText = String(format: "£%.3f", price / 100)
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let freshness = SiriCheapestLookup.freshnessLabel(
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updated: FuelStore.loadDataUpdated(),
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lastRefresh: FuelStore.loadLastRefresh()
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)
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let summary = "\(station.name): \(priceText), \(distanceText)"
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let freshnessClause = freshness.isEmpty ? "" : " — prices \(freshness)"
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let dialog = "The cheapest \(fuel.displayName.lowercased()) near you is \(station.name) at \(priceText), \(distanceText) away\(freshnessClause)."
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return .result(
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value: summary,
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dialog: IntentDialog(stringLiteral: dialog),
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view: CheapestFuelCard(
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stationName: station.name,
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fuelName: fuel.displayName,
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price: priceText,
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distance: distanceText,
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freshness: freshness
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)
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)
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}
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}
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// MARK: - Snippets
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/// Price card shown in Shortcuts / Siri results.
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struct CheapestFuelCard: View {
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let stationName: String
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let fuelName: String
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let price: String
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let distance: String
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let freshness: String
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var body: some View {
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HStack(spacing: 14) {
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Image(systemName: "fuelpump.fill")
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.font(.title2)
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.foregroundStyle(.tint)
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VStack(alignment: .leading, spacing: 2) {
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Text(stationName)
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.font(.headline)
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.lineLimit(1)
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Text("\(fuelName) · \(distance)")
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.font(.subheadline)
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.foregroundStyle(.secondary)
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if !freshness.isEmpty {
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Text(freshness)
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.font(.caption)
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.foregroundStyle(.tertiary)
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}
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}
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Spacer(minLength: 8)
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Text(price)
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.font(.title2.bold())
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.monospacedDigit()
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}
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.padding(12)
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}
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}
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/// Fallback message card for the no-data / no-location / no-station cases.
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struct CheapestFuelMessage: View {
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let text: String
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var body: some View {
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HStack(spacing: 10) {
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Image(systemName: "info.circle")
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.foregroundStyle(.secondary)
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Text(text)
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.font(.subheadline)
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}
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.padding(12)
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}
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}
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// MARK: - App Shortcuts
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struct FuelBoardShortcuts: AppShortcutsProvider {
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static var appShortcuts: [AppShortcut] {
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// Generic parameterized shortcut — matches whatever fuel word Siri
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// resolves. Parameter resolution is flaky on-device ("cheapest diesel"
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// matched, "cheapest unleaded" didn't), which is why the fixed-fuel
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// entries below carry the fuel word as LITERAL phrase text.
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AppShortcut(
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intent: CheapestFuelIntent(),
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phrases: [
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"Ask \(.applicationName) what's the cheapest \(\.$fuel) near me",
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],
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shortTitle: "Cheapest Fuel",
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systemImageName: "fuelpump"
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)
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AppShortcut(
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intent: CheapestFuelIntent(fuel: .e10),
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phrases: [
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"Ask \(.applicationName) for the cheapest unleaded near me",
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"Ask \(.applicationName) for the cheapest petrol near me",
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"Find the cheapest petrol near me \(.applicationName)",
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],
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shortTitle: "Cheapest Petrol",
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systemImageName: "fuelpump"
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)
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AppShortcut(
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intent: CheapestFuelIntent(fuel: .e5),
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phrases: [
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"Ask \(.applicationName) for the cheapest premium near me",
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"Ask \(.applicationName) for the cheapest super unleaded near me",
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"Find the cheapest super unleaded near me \(.applicationName)",
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],
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shortTitle: "Cheapest Super Unleaded",
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systemImageName: "fuelpump"
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)
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AppShortcut(
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intent: CheapestFuelIntent(fuel: .diesel),
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phrases: [
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"Ask \(.applicationName) for the cheapest diesel near me",
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"Find the cheapest diesel near me \(.applicationName)",
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"Cheapest diesel near me \(.applicationName)",
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],
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shortTitle: "Cheapest Diesel",
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systemImageName: "fuelpump"
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)
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}
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}
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