import Foundation

/// Presentation-only notices derived from existing station metadata.
///
/// These do not alter `FuelStation`, persistence, filtering, sorting, or
/// navigation. They are intentionally small and reusable so additional
/// informational station notices can be added later from the UI layer.
enum StationNotice: Identifiable, Equatable {
    case membershipRequired

    var id: String {
        switch self {
        case .membershipRequired: return "membershipRequired"
        }
    }

    var title: String {
        switch self {
        case .membershipRequired: return "Membership required"
        }
    }

    var symbolName: String {
        switch self {
        case .membershipRequired: return "creditcard.fill"
        }
    }

    static func notices(for station: FuelStation) -> [StationNotice] {
        isCostco(station) ? [.membershipRequired] : []
    }

    static func isCostco(_ station: FuelStation) -> Bool {
        containsCostcoToken(station.brand) || containsCostcoToken(station.name)
    }

    private static func containsCostcoToken(_ value: String) -> Bool {
        let tokens = value.uppercased().split { !$0.isLetter && !$0.isNumber }
        return tokens.contains("COSTCO")
    }
}