import CodexBarCoreimport Foundation struct Sub2APIProviderImplementation: ProviderImplementation {    let id: UsageProvider = .sub2api     @MainActor    func presentation(context _: ProviderPresentationContext) -> ProviderPresentation {        ProviderPresentation { _ in "api" }    }     @MainActor    func observeSettings(_ settings: SettingsStore) {        _ = settings.sub2APIAPIKey        _ = settings.sub2APIBaseURL        _ = settings.tokenAccountsData(for: .sub2api)    }     @MainActor    func isAvailable(context: ProviderAvailabilityContext) -> Bool {        Sub2APISettingsReader.apiKey(environment: context.environment) != nil &&            Sub2APISettingsReader.baseURL(environment: context.environment) != nil    }     @MainActor    func settingsFields(context: ProviderSettingsContext) -> [ProviderSettingsFieldDescriptor] {        [            ProviderSettingsFieldDescriptor(                id: "sub2api-api-key",                title: "Fallback API key",                subtitle: "Used when no group API key account is selected.",                kind: .secure,                placeholder: "sk-…",                binding: context.stringBinding(\.sub2APIAPIKey),                actions: [],                isVisible: nil,                onActivate: nil),            ProviderSettingsFieldDescriptor(                id: "sub2api-base-url",                title: "Base URL",                subtitle: "Base URL of your sub2api instance. HTTPS is required except for local loopback testing.",                kind: .plain,                placeholder: "https://sub2api.example.com",                binding: context.stringBinding(\.sub2APIBaseURL),                actions: [],                isVisible: nil,                onActivate: nil),        ]    }     @MainActor    func appendUsageMenuEntries(context: ProviderMenuUsageContext, entries: inout [ProviderMenuEntry]) {        guard let usage = context.snapshot?.sub2APIUsage else { return }        if let balance = usage.balance {            entries.append(.text(                "\(L("Balance")): \(UsageFormatter.currencyString(balance, currencyCode: usage.unit))",                .primary))        }        if let today = usage.today {            entries.append(.text("\(L("Today")): \(self.totalsText(today, unit: usage.unit))", .secondary))        }        if let total = usage.total {            entries.append(.text("\(L("Total")): \(self.totalsText(total, unit: usage.unit))", .secondary))        }    }     private func totalsText(_ totals: Sub2APIUsageDetails.Totals, unit: String) -> String {        "\(UsageFormatter.tokenCountString(totals.requests)) \(L("requests")) · " +            "\(UsageFormatter.tokenCountString(totals.totalTokens)) \(L("tokens")) · " +            UsageFormatter.currencyString(totals.actualCostUSD, currencyCode: unit)    }}