// FuelBoardLiveActivity.swift — Live Activity shared model.
//
// Compiled into BOTH the app target (to start/update/end the activity) and
// the widget extension (to render it). ActivityKit is iOS-only, so this file
// is deliberately NOT symlinked into FuelBoardTests/Sources — the SPM test
// target runs on macOS where ActivityKit does not exist.
//
// The activity tracks the cheapest station for the fuel + radius configured
// in Settings → Live Activity (INDEPENDENT of the Stations-tab selection).
// Everything dynamic lives in ContentState so updates — including a fuel
// change — apply to the running activity without needing to restart it.
// Tapping the activity opens Apple Maps driving directions (maps://).

import ActivityKit
import Foundation

/// Attributes are fixed at request time. Kept empty: the fuel itself lives in
/// ContentState so a fuel change in Settings updates the running activity
/// in place instead of requiring an end + restart.
struct FuelBoardLiveActivityAttributes: ActivityAttributes {
    public struct ContentState: Codable, Hashable {
        var fuel: FuelType
        var stationID: String
        var stationName: String
        var brand: String
        /// Price in pence per litre (same unit as `FuelStation.prices`).
        var pricePence: Double
        /// Display style at push time (station sign vs pounds & pence) — carried
        /// in the state so the extension renders deterministically instead of
        /// re-reading storage that may not be shared on sideloads.
        var priceDisplayStyle: PriceDisplayStyle
        var distanceKM: Double
        var lat: Double
        var lng: Double
        var updatedAt: Date
    }
}