smart_printer/smart_printer/PaywallView.swift

import Cocoa
import StoreKit

// MARK: - Plan Model

enum PaywallPlan: CaseIterable {
    case monthly
    case yearly
    case lifetime

    var productID: String {
        switch self {
        case .monthly: StoreProductID.monthly
        case .yearly: StoreProductID.yearly
        case .lifetime: StoreProductID.lifetime
        }
    }

    func planCopy(from config: PaywallConfig) -> PaywallConfig.PlanCopy {
        switch self {
        case .monthly: config.plans.monthly
        case .yearly: config.plans.yearly
        case .lifetime: config.plans.lifetime
        }
    }

    func localizedPrice(from product: Product?, config: PaywallConfig) -> String {
        product?.displayPrice ?? config.loadingPrice
    }

    func localizedSubtitle(
        from product: Product?,
        config: PaywallConfig,
        introOffer: Product.SubscriptionOffer? = nil
    ) -> String {
        guard let product else { return config.loadingPrice }
        let copy = planCopy(from: config)
        let price = product.displayPrice

        if self == .yearly, let introOffer, let trialTemplate = copy.trialSubtitleTemplate {
            let duration = config.trialDurationDescription(from: introOffer, lowercase: true)
            return trialTemplate
                .replacingOccurrences(of: "{trial}", with: duration)
                .replacingOccurrences(of: "{price}", with: price)
        }

        return copy.subtitleTemplate.replacingOccurrences(of: "{price}", with: price)
    }

    func localizedCTATitle(
        from product: Product?,
        config: PaywallConfig,
        introOffer: Product.SubscriptionOffer? = nil
    ) -> String {
        guard let product else { return config.loadingCTA }
        let copy = planCopy(from: config)
        let price = product.displayPrice

        if self == .yearly, let introOffer {
            return config.trialCTATitle(from: introOffer)
        }

        return copy.ctaTemplate.replacingOccurrences(of: "{price}", with: price)
    }

    func localizedRenewalDisclosure(
        from product: Product?,
        config: PaywallConfig,
        introOffer: Product.SubscriptionOffer? = nil
    ) -> String {
        switch self {
        case .lifetime:
            return config.lifetimeDisclosure
        case .monthly, .yearly:
            guard let product else { return config.loadingDisclosure }
            let price = product.displayPrice
            let period = product.subscription.map {
                config.subscriptionPeriodDescription(from: $0.subscriptionPeriod)
            } ?? config.messages.periodFallback

            if self == .yearly, let introOffer {
                let trial = config.trialDurationDescription(from: introOffer, lowercase: true)
                return config.trialDisclosureTemplate
                    .replacingOccurrences(of: "{trial}", with: trial)
                    .replacingOccurrences(of: "{price}", with: price)
                    .replacingOccurrences(of: "{period}", with: period)
            }

            return config.subscriptionDisclosureTemplate
                .replacingOccurrences(of: "{price}", with: price)
                .replacingOccurrences(of: "{period}", with: period)
        }
    }
}

// MARK: - StoreKit

enum StoreProductID {
    static let monthly = AppStoreConfig.ProductID.monthly
    static let yearly = AppStoreConfig.ProductID.yearly
    static let lifetime = AppStoreConfig.ProductID.lifetime

    static let all = AppStoreConfig.ProductID.all
}

enum PremiumAccessKind: String {
    case none
    case subscription
    case lifetime
}

enum StoreError: Error {
    case productNotFound
    case failedVerification
}

enum PurchaseOutcome: Sendable {
    case purchased
    case cancelled
    case pending
}

@MainActor
final class StoreManager {
    static let shared = StoreManager()

    private static let cachedPremiumKey = "StoreManager.cachedIsPremium"
    private static let cachedPremiumKindKey = "StoreManager.cachedPremiumAccessKind"

    private(set) var products: [Product] = []
    private(set) var isPremium = UserDefaults.standard.bool(forKey: cachedPremiumKey)
    private(set) var premiumAccessKind: PremiumAccessKind = {
        guard let raw = UserDefaults.standard.string(forKey: cachedPremiumKindKey),
              let kind = PremiumAccessKind(rawValue: raw) else {
            return .none
        }
        return kind
    }()

    var isPro: Bool { isPremium }
    var hasActiveSubscription: Bool { premiumAccessKind == .subscription }
    var hasLifetimeAccess: Bool { premiumAccessKind == .lifetime }
    private(set) var isLoadingProducts = false
    private(set) var productLoadError: String?
    private(set) var isPurchasing = false
    private(set) var isResolvingEntitlements = true
    private(set) var introOfferEligibleByProductID: [String: Bool] = [:]

    private var transactionListener: Task<Void, Never>?
    private var initialEntitlementTask: Task<Void, Never>?
    private var hasStarted = false

    private init() {}

    func start() {
        guard !hasStarted else { return }
        hasStarted = true

        transactionListener = Task { [weak self] in
            for await update in Transaction.updates {
                await self?.handleTransactionUpdate(update)
            }
        }

        initialEntitlementTask = Task { [weak self] in
            guard let self else { return }
            await self.refreshEntitlementsOnly()
            self.isResolvingEntitlements = false
            NotificationCenter.default.post(name: .entitlementsDidResolve, object: nil)
            await self.loadProducts()
            await self.refreshPremiumStatus()
        }
    }

    func ensureEntitlementsResolved() async {
        await initialEntitlementTask?.value
    }

    func product(for plan: PaywallPlan) -> Product? {
        products.first { $0.id == plan.productID }
    }

    func eligibleIntroOffer(for plan: PaywallPlan) -> Product.SubscriptionOffer? {
        guard let product = product(for: plan) else { return nil }
        return eligibleIntroOffer(for: product)
    }

    func eligibleIntroOffer(for product: Product) -> Product.SubscriptionOffer? {
        guard introOfferEligibleByProductID[product.id] == true,
              let offer = product.subscription?.introductoryOffer,
              offer.paymentMode == .freeTrial else {
            return nil
        }
        return offer
    }

    func loadProducts() async {
        isLoadingProducts = true
        productLoadError = nil
        postStoreStateDidChange()
        defer {
            isLoadingProducts = false
            postStoreStateDidChange()
        }

        do {
            let loaded = try await Product.products(for: StoreProductID.all)
            guard !loaded.isEmpty else {
                productLoadError = PaywallConfigService.shared.config.messages.noPlansAvailable
                products = []
                return
            }
            products = loaded.sorted { lhs, rhs in
                productSortOrder(for: lhs.id) < productSortOrder(for: rhs.id)
            }
            productLoadError = nil
            await refreshIntroOfferEligibility()
            NotificationCenter.default.post(name: .storeProductsDidUpdate, object: nil)
        } catch {
            productLoadError = PaywallConfigService.shared.config.messages.plansLoadFailed
            NSLog("Failed to load products: \(error.localizedDescription)")
        }
    }

    @discardableResult
    func purchase(plan: PaywallPlan) async throws -> PurchaseOutcome {
        if products.isEmpty {
            await loadProducts()
        }

        guard let product = product(for: plan) else {
            throw StoreError.productNotFound
        }

        isPurchasing = true
        postStoreStateDidChange()
        defer {
            isPurchasing = false
            postStoreStateDidChange()
        }

        let result = try await product.purchase()

        switch result {
        case .success(let verification):
            let transaction = try checkVerified(verification)
            await transaction.finish()
            applyPremiumStatus(premiumAccessKind(for: transaction.productID))
            await refreshPremiumStatus()
            return .purchased
        case .userCancelled:
            return .cancelled
        case .pending:
            return .pending
        @unknown default:
            return .cancelled
        }
    }

    @discardableResult
    func restorePurchases() async throws -> Bool {
        isPurchasing = true
        postStoreStateDidChange()
        defer {
            isPurchasing = false
            postStoreStateDidChange()
        }

        try await AppStore.sync()
        await refreshPremiumStatus()
        return isPremium
    }

    func showAlert(title: String, message: String, on window: NSWindow?) {
        let alert = NSAlert()
        alert.messageText = title
        alert.informativeText = message
        alert.alertStyle = .informational
        alert.addButton(withTitle: PaywallConfigService.shared.config.messages.alertOK)
        if let window {
            alert.beginSheetModal(for: window)
        } else {
            alert.runModal()
        }
    }

    func showManageSubscriptions() {
        let urlString = PaywallConfigService.shared.config.urls.manageSubscriptions
        guard let url = URL(string: urlString) else { return }
        NSWorkspace.shared.open(url)
    }

    func showPurchaseError(_ error: Error, on window: NSWindow?) {
        let messages = PaywallConfigService.shared.config.messages
        switch error {
        case StoreError.productNotFound:
            showAlert(title: messages.purchaseFailedTitle, message: messages.productNotFound, on: window)
        case StoreError.failedVerification:
            showAlert(title: messages.purchaseFailedTitle, message: messages.failedVerification, on: window)
        default:
            if let storeKitError = error as? StoreKitError, case .userCancelled = storeKitError {
                return
            }
            showAlert(title: messages.purchaseFailedTitle, message: error.localizedDescription, on: window)
        }
    }

    private func handleTransactionUpdate(_ update: VerificationResult<Transaction>) async {
        do {
            let transaction = try checkVerified(update)
            await transaction.finish()
            await refreshPremiumStatus()
        } catch {
            NSLog("Transaction verification failed: \(error.localizedDescription)")
        }
    }

    func refreshEntitlementsOnly() async {
        applyPremiumStatus(await resolvePremiumAccessKind())
    }

    func refreshPremiumStatus() async {
        await refreshIntroOfferEligibility()
        applyPremiumStatus(await resolvePremiumAccessKind())
    }

    private func applyPremiumStatus(_ kind: PremiumAccessKind) {
        let hasPremium = kind != .none
        let didChange = hasPremium != isPremium || kind != premiumAccessKind
        isPremium = hasPremium
        premiumAccessKind = hasPremium ? kind : .none
        UserDefaults.standard.set(hasPremium, forKey: Self.cachedPremiumKey)
        UserDefaults.standard.set(premiumAccessKind.rawValue, forKey: Self.cachedPremiumKindKey)

        if didChange {
            NotificationCenter.default.post(name: .premiumStatusDidChange, object: nil)
        }
        postStoreStateDidChange()
    }

    private func resolvePremiumAccessKind() async -> PremiumAccessKind {
        if await hasActiveEntitlement(for: StoreProductID.lifetime) {
            return .lifetime
        }
        if await hasActiveEntitlement(for: StoreProductID.monthly) {
            return .subscription
        }
        if await hasActiveEntitlement(for: StoreProductID.yearly) {
            return .subscription
        }
        if await hasEntitlementFromSubscriptionStatus() {
            return .subscription
        }
        return .none
    }

    private func premiumAccessKind(for productID: String) -> PremiumAccessKind {
        if productID == StoreProductID.lifetime {
            return .lifetime
        }
        if productID == StoreProductID.monthly || productID == StoreProductID.yearly {
            return .subscription
        }
        return .none
    }

    private func hasActiveEntitlement(for productID: String) async -> Bool {
        for await result in Transaction.currentEntitlements {
            guard let transaction = try? checkVerified(result) else { continue }
            if transaction.productID == productID, isActivePremiumTransaction(transaction) {
                return true
            }
        }

        guard let result = await Transaction.latest(for: productID),
              let transaction = try? checkVerified(result) else {
            return false
        }
        return isActivePremiumTransaction(transaction)
    }

    private func hasEntitlementFromSubscriptionStatus() async -> Bool {
        for product in products where product.subscription != nil {
            guard StoreProductID.all.contains(product.id) else { continue }
            guard let statuses = try? await product.subscription?.status else { continue }
            for status in statuses {
                switch status.state {
                case .subscribed, .inGracePeriod, .inBillingRetryPeriod:
                    return true
                default:
                    continue
                }
            }
        }
        return false
    }

    private func isActivePremiumTransaction(_ transaction: Transaction) -> Bool {
        guard StoreProductID.all.contains(transaction.productID) else { return false }
        guard transaction.revocationDate == nil else { return false }
        if let expirationDate = transaction.expirationDate {
            return expirationDate > Date()
        }
        return true
    }

    private func checkVerified<T>(_ result: VerificationResult<T>) throws -> T {
        switch result {
        case .unverified:
            throw StoreError.failedVerification
        case .verified(let safe):
            return safe
        }
    }

    private func productSortOrder(for productID: String) -> Int {
        switch productID {
        case StoreProductID.monthly: 0
        case StoreProductID.yearly: 1
        case StoreProductID.lifetime: 2
        default: 99
        }
    }

    private func refreshIntroOfferEligibility() async {
        var eligibility: [String: Bool] = [:]

        for product in products {
            guard let subscription = product.subscription,
                  subscription.introductoryOffer != nil else {
                continue
            }
            let groupID = subscription.subscriptionGroupID
            eligibility[product.id] = await Product.SubscriptionInfo.isEligibleForIntroOffer(for: groupID)
        }

        introOfferEligibleByProductID = eligibility
    }

    private func postStoreStateDidChange() {
        NotificationCenter.default.post(name: .storeStateDidChange, object: nil)
    }
}

extension Notification.Name {
    static let premiumStatusDidChange = Notification.Name("premiumStatusDidChange")
    static let entitlementsDidResolve = Notification.Name("entitlementsDidResolve")
    static let storeProductsDidUpdate = Notification.Name("storeProductsDidUpdate")
    static let storeStateDidChange = Notification.Name("storeStateDidChange")
}

// MARK: - Premium Access

enum PremiumAccess {
    @MainActor
    static func canAccess(_ feature: AppFeature) -> Bool {
        let store = StoreManager.shared
        if store.isResolvingEntitlements {
            return FreeTierManager.canAccess(feature, isPremium: false)
        }
        return FreeTierManager.canAccess(feature, isPremium: store.isPremium)
    }

    @MainActor
    @discardableResult
    static func require(
        feature: AppFeature,
        from window: NSWindow?,
        returnToHomeOnDismiss: Bool = false
    ) -> Bool {
        guard canAccess(feature) else {
            presentPaywallOrLimitAlert(for: feature, from: window, returnToHomeOnDismiss: returnToHomeOnDismiss)
            return false
        }
        return true
    }

    @MainActor
    @discardableResult
    static func require(from window: NSWindow?, returnToHomeOnDismiss: Bool = false) -> Bool {
        require(feature: .documentImport, from: window, returnToHomeOnDismiss: returnToHomeOnDismiss)
    }

    @MainActor
    private static func presentPaywallOrLimitAlert(
        for feature: AppFeature,
        from window: NSWindow?,
        returnToHomeOnDismiss: Bool
    ) {
        if StoreManager.shared.isResolvingEntitlements {
            Task { @MainActor in
                await StoreManager.shared.ensureEntitlementsResolved()
                guard !canAccess(feature) else { return }
                presentPaywallOrLimitAlert(for: feature, from: window, returnToHomeOnDismiss: returnToHomeOnDismiss)
            }
            return
        }

        guard let viewController = mainViewController(from: window) else { return }
        viewController.presentPaywall(returnToHomeOnDismiss: returnToHomeOnDismiss)
    }

    @MainActor
    static func mainViewController(from window: NSWindow?) -> ViewController? {
        if let viewController = window?.contentViewController as? ViewController {
            return viewController
        }
        if let viewController = NSApp.keyWindow?.contentViewController as? ViewController {
            return viewController
        }
        for appWindow in NSApp.windows where appWindow.canBecomeMain {
            if let viewController = appWindow.contentViewController as? ViewController {
                return viewController
            }
        }
        return nil
    }
}

// MARK: - Left Panel

private final class PaywallLeftPanelView: NSView, AppearanceRefreshable {
    private let gradientLayer = CAGradientLayer()

    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        wantsLayer = true
        gradientLayer.startPoint = CGPoint(x: 0.5, y: 1)
        gradientLayer.endPoint = CGPoint(x: 0.5, y: 0)
        layer?.insertSublayer(gradientLayer, at: 0)
        refreshAppearance()
    }

    func refreshAppearance() {
        gradientLayer.colors = AppTheme.paywallLeftGradientColors.map(\.cgColor)
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }

    override func layout() {
        super.layout()
        gradientLayer.frame = bounds
        let mask = CAShapeLayer()
        mask.path = CGPath(
            roundedRect: bounds,
            cornerWidth: 20,
            cornerHeight: 20,
            transform: nil
        )
        layer?.mask = mask
    }
}

// MARK: - Badge

private final class PaywallBadgeView: NSView {
    private let label: NSTextField

    init(text: String, iconName: String, background: NSColor, foreground: NSColor) {
        label = NSTextField(labelWithString: text)
        super.init(frame: .zero)
        translatesAutoresizingMaskIntoConstraints = false
        wantsLayer = true
        layer?.backgroundColor = background.cgColor
        layer?.cornerRadius = 10
        layer?.masksToBounds = true

        let icon = NSImageView()
        icon.translatesAutoresizingMaskIntoConstraints = false
        if let image = NSImage(systemSymbolName: iconName, accessibilityDescription: nil) {
            let config = NSImage.SymbolConfiguration(pointSize: 9, weight: .semibold)
            icon.image = image.withSymbolConfiguration(config)
        }
        icon.contentTintColor = foreground

        label.font = AppTheme.semiboldFont(size: 10)
        label.textColor = foreground
        label.translatesAutoresizingMaskIntoConstraints = false

        addSubview(icon)
        addSubview(label)

        NSLayoutConstraint.activate([
            heightAnchor.constraint(equalToConstant: 20),

            icon.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 8),
            icon.centerYAnchor.constraint(equalTo: centerYAnchor),
            icon.widthAnchor.constraint(equalToConstant: 12),
            icon.heightAnchor.constraint(equalToConstant: 12),

            label.leadingAnchor.constraint(equalTo: icon.trailingAnchor, constant: 4),
            label.centerYAnchor.constraint(equalTo: centerYAnchor),
            label.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -8),
        ])
    }

    func updateText(_ text: String) {
        label.stringValue = text
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }
}

// MARK: - Feature Row

private final class PaywallFeatureRow: NSView, AppearanceRefreshable {
    private let label: NSTextField

    init(text: String) {
        label = NSTextField.themeLabel(text, style: .primary, font: AppTheme.regularFont(size: 14))
        super.init(frame: .zero)
        translatesAutoresizingMaskIntoConstraints = false

        let checkContainer = NSView()
        checkContainer.translatesAutoresizingMaskIntoConstraints = false
        checkContainer.wantsLayer = true
        checkContainer.layer?.backgroundColor = AppTheme.green.cgColor
        checkContainer.layer?.cornerRadius = 10
        checkContainer.layer?.masksToBounds = true

        let checkIcon = NSImageView()
        checkIcon.translatesAutoresizingMaskIntoConstraints = false
        if let image = NSImage(systemSymbolName: "checkmark", accessibilityDescription: nil) {
            let config = NSImage.SymbolConfiguration(pointSize: 9, weight: .bold)
            checkIcon.image = image.withSymbolConfiguration(config)
        }
        checkIcon.contentTintColor = .white

        label.translatesAutoresizingMaskIntoConstraints = false

        addSubview(checkContainer)
        checkContainer.addSubview(checkIcon)
        addSubview(label)

        NSLayoutConstraint.activate([
            heightAnchor.constraint(equalToConstant: 28),

            checkContainer.leadingAnchor.constraint(equalTo: leadingAnchor),
            checkContainer.centerYAnchor.constraint(equalTo: centerYAnchor),
            checkContainer.widthAnchor.constraint(equalToConstant: 20),
            checkContainer.heightAnchor.constraint(equalToConstant: 20),

            checkIcon.centerXAnchor.constraint(equalTo: checkContainer.centerXAnchor),
            checkIcon.centerYAnchor.constraint(equalTo: checkContainer.centerYAnchor),
            checkIcon.widthAnchor.constraint(equalToConstant: 12),
            checkIcon.heightAnchor.constraint(equalToConstant: 12),

            label.leadingAnchor.constraint(equalTo: checkContainer.trailingAnchor, constant: 12),
            label.centerYAnchor.constraint(equalTo: centerYAnchor),
            label.trailingAnchor.constraint(equalTo: trailingAnchor),
        ])
    }

    func updateText(_ text: String) {
        label.stringValue = text
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }

    func refreshAppearance() {
        label.refreshThemeLabelColor()
    }
}

// MARK: - Plan Card

private final class PaywallPlanCard: NSControl, AppearanceRefreshable {
    var onSelect: (() -> Void)?

    private let plan: PaywallPlan
    private let titleLabel = NSTextField(labelWithString: "")
    private let subtitleLabel = NSTextField(labelWithString: "")
    private let priceLabel = NSTextField(labelWithString: "")
    private var badgeView: PaywallBadgeView?
    private var trialBadgeView: PaywallBadgeView?
    private var hoverTracker: HoverTracker?
    private var isHovered = false

    var isChosen: Bool = false {
        didSet { updateAppearance() }
    }

    init(plan: PaywallPlan) {
        self.plan = plan
        super.init(frame: .zero)
        translatesAutoresizingMaskIntoConstraints = false
        wantsLayer = true
        layer?.cornerRadius = 12
        layer?.masksToBounds = false

        let config = PaywallConfigService.shared.config
        titleLabel.stringValue = plan.planCopy(from: config).title
        titleLabel.font = AppTheme.semiboldFont(size: 15)
        titleLabel.translatesAutoresizingMaskIntoConstraints = false

        subtitleLabel.stringValue = config.loadingPrice
        subtitleLabel.font = AppTheme.regularFont(size: 11)
        subtitleLabel.themeLabelStyle = .secondary
        subtitleLabel.textColor = AppTheme.textSecondary
        subtitleLabel.translatesAutoresizingMaskIntoConstraints = false

        priceLabel.stringValue = config.loadingPrice
        priceLabel.font = AppTheme.semiboldFont(size: 15)
        priceLabel.alignment = .right
        priceLabel.translatesAutoresizingMaskIntoConstraints = false

        addSubview(titleLabel)
        addSubview(subtitleLabel)
        addSubview(priceLabel)

        NSLayoutConstraint.activate([
            heightAnchor.constraint(equalToConstant: 86),

            titleLabel.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 16),
            titleLabel.topAnchor.constraint(equalTo: topAnchor, constant: 24),

            subtitleLabel.leadingAnchor.constraint(equalTo: titleLabel.leadingAnchor),
            subtitleLabel.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 3),
            subtitleLabel.trailingAnchor.constraint(lessThanOrEqualTo: priceLabel.leadingAnchor, constant: -12),

            priceLabel.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -16),
            priceLabel.centerYAnchor.constraint(equalTo: centerYAnchor),
        ])

        if plan == .lifetime, let badgeText = plan.planCopy(from: config).badge {
            let badge = PaywallBadgeView(
                text: badgeText,
                iconName: "star.fill",
                background: AppTheme.paywallGold,
                foreground: AppTheme.paywallGoldText
            )
            badgeView = badge
            addSubview(badge)
            NSLayoutConstraint.activate([
                badge.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -12),
                badge.topAnchor.constraint(equalTo: topAnchor, constant: 8),
            ])
        }

        applyCardShadow()
        updateAppearance()

        hoverTracker = HoverTracker(view: self) { [weak self] hovering in
            self?.setHovered(hovering)
        }
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }

    func updateDisplay(
        product: Product?,
        config: PaywallConfig,
        introOffer: Product.SubscriptionOffer? = nil
    ) {
        titleLabel.stringValue = plan.planCopy(from: config).title
        subtitleLabel.stringValue = plan.localizedSubtitle(from: product, config: config, introOffer: introOffer)
        priceLabel.stringValue = plan.localizedPrice(from: product, config: config)
        updateLifetimeBadge(config: config)
        updateTrialBadge(introOffer: introOffer)
    }

    private func updateLifetimeBadge(config: PaywallConfig) {
        guard plan == .lifetime else { return }
        if let badgeText = plan.planCopy(from: config).badge {
            if let badgeView {
                badgeView.updateText(badgeText)
                badgeView.isHidden = false
            }
        } else {
            badgeView?.isHidden = true
        }
    }

    private func updateTrialBadge(introOffer: Product.SubscriptionOffer?) {
        guard plan == .yearly else { return }

        if let introOffer {
            let text = PaywallConfigService.shared.config.trialBadgeText(from: introOffer)
            if let trialBadgeView {
                trialBadgeView.updateText(text)
                trialBadgeView.isHidden = false
            } else {
                let badge = PaywallBadgeView(
                    text: text,
                    iconName: "calendar",
                    background: AppTheme.paywallPink,
                    foreground: AppTheme.paywallPinkText
                )
                trialBadgeView = badge
                addSubview(badge)
                NSLayoutConstraint.activate([
                    badge.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -12),
                    badge.topAnchor.constraint(equalTo: topAnchor, constant: 8),
                ])
            }
        } else {
            trialBadgeView?.isHidden = true
        }
    }

    func refreshAppearance() {
        updateAppearance()
        subtitleLabel.refreshThemeLabelColor()
        if isHovered {
            applyHoverLift(true)
        }
    }

    private func setHovered(_ hovering: Bool) {
        isHovered = hovering
        applyHoverLift(hovering)
        updateAppearance()
    }

    private func updateAppearance() {
        let titleColor = isChosen && plan == .yearly ? AppTheme.green : AppTheme.paywallAccent
        titleLabel.textColor = titleColor
        priceLabel.textColor = titleColor

        layer?.backgroundColor = AppTheme.paywallTrustBackground.cgColor

        if isChosen {
            layer?.borderWidth = 2
            layer?.borderColor = AppTheme.green.cgColor
        } else if isHovered {
            layer?.borderWidth = 2
            let hoverBorder = AppTheme.paywallBorder.blended(withFraction: 0.35, of: AppTheme.paywallAccent)
                ?? AppTheme.paywallBorder
            layer?.borderColor = hoverBorder.cgColor
        } else {
            layer?.borderWidth = 1.5
            layer?.borderColor = AppTheme.paywallBorder.cgColor
        }
    }

    override func mouseUp(with event: NSEvent) {
        guard bounds.contains(convert(event.locationInWindow, from: nil)) else { return }
        onSelect?()
    }

    override func resetCursorRects() {
        addCursorRect(bounds, cursor: .pointingHand)
    }
}

// MARK: - Footer Link

private final class PaywallFooterLink: NSButton, AppearanceRefreshable {
    private var hoverTracker: HoverTracker?
    private var isHovered = false

    init(title: String) {
        super.init(frame: .zero)
        updateTitle(title)
        isBordered = false
        bezelStyle = .inline
        font = AppTheme.regularFont(size: 11)
        translatesAutoresizingMaskIntoConstraints = false
        refreshAppearance()

        hoverTracker = HoverTracker(view: self) { [weak self] hovering in
            self?.isHovered = hovering
            self?.refreshAppearance()
        }
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }

    func updateTitle(_ title: String) {
        self.title = title
        invalidateIntrinsicContentSize()
        needsDisplay = true
    }

    func refreshAppearance() {
        contentTintColor = isHovered ? AppTheme.textPrimary : AppTheme.textSecondary
    }

    override func resetCursorRects() {
        addCursorRect(bounds, cursor: .pointingHand)
    }
}

// MARK: - Footer Trust Item

private final class PaywallTrustItemView: NSView, AppearanceRefreshable {
    private let iconContainer = NSView()
    private let icon = NSImageView()
    private let titleLabel: NSTextField
    private let subtitleLabel: NSTextField

    init(iconName: String, title: String, subtitle: String) {
        titleLabel = NSTextField.themeLabel(title, style: .primary, font: AppTheme.semiboldFont(size: 11))
        subtitleLabel = NSTextField.themeLabel(subtitle, style: .secondary, font: AppTheme.regularFont(size: 9))
        super.init(frame: .zero)
        translatesAutoresizingMaskIntoConstraints = false

        iconContainer.translatesAutoresizingMaskIntoConstraints = false
        iconContainer.wantsLayer = true
        iconContainer.layer?.cornerRadius = 10
        iconContainer.layer?.masksToBounds = true

        icon.translatesAutoresizingMaskIntoConstraints = false
        if let image = NSImage(systemSymbolName: iconName, accessibilityDescription: nil) {
            let config = NSImage.SymbolConfiguration(pointSize: 11, weight: .semibold)
            icon.image = image.withSymbolConfiguration(config)
        }

        titleLabel.lineBreakMode = .byTruncatingTail
        titleLabel.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
        titleLabel.translatesAutoresizingMaskIntoConstraints = false

        subtitleLabel.lineBreakMode = .byTruncatingTail
        subtitleLabel.maximumNumberOfLines = 2
        subtitleLabel.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
        subtitleLabel.translatesAutoresizingMaskIntoConstraints = false

        addSubview(iconContainer)
        iconContainer.addSubview(icon)
        addSubview(titleLabel)
        addSubview(subtitleLabel)

        NSLayoutConstraint.activate([
            heightAnchor.constraint(equalToConstant: Self.preferredHeight),

            iconContainer.leadingAnchor.constraint(equalTo: leadingAnchor),
            iconContainer.topAnchor.constraint(equalTo: topAnchor),
            iconContainer.widthAnchor.constraint(equalToConstant: 20),
            iconContainer.heightAnchor.constraint(equalToConstant: 20),

            icon.centerXAnchor.constraint(equalTo: iconContainer.centerXAnchor),
            icon.centerYAnchor.constraint(equalTo: iconContainer.centerYAnchor),
            icon.widthAnchor.constraint(equalToConstant: 12),
            icon.heightAnchor.constraint(equalToConstant: 12),

            titleLabel.leadingAnchor.constraint(equalTo: iconContainer.trailingAnchor, constant: 8),
            titleLabel.topAnchor.constraint(equalTo: topAnchor, constant: 1),
            titleLabel.trailingAnchor.constraint(equalTo: trailingAnchor),

            subtitleLabel.leadingAnchor.constraint(equalTo: titleLabel.leadingAnchor),
            subtitleLabel.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 2),
            subtitleLabel.trailingAnchor.constraint(equalTo: trailingAnchor),
            subtitleLabel.bottomAnchor.constraint(equalTo: bottomAnchor),
        ])

        setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
        setContentHuggingPriority(.defaultLow, for: .horizontal)
        setContentHuggingPriority(.required, for: .vertical)
        setContentCompressionResistancePriority(.required, for: .vertical)
        refreshAppearance()
    }

    fileprivate static let preferredHeight: CGFloat = 34

    func update(iconName: String, title: String, subtitle: String) {
        titleLabel.stringValue = title
        subtitleLabel.stringValue = subtitle
        if let image = NSImage(systemSymbolName: iconName, accessibilityDescription: nil) {
            let symbolConfig = NSImage.SymbolConfiguration(pointSize: 11, weight: .semibold)
            icon.image = image.withSymbolConfiguration(symbolConfig)
        }
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }

    func refreshAppearance() {
        iconContainer.layer?.backgroundColor = AppTheme.paywallTrustIconBackground.cgColor
        icon.contentTintColor = AppTheme.paywallIconAccent
        titleLabel.refreshThemeLabelColor()
        subtitleLabel.refreshThemeLabelColor()
    }
}

// MARK: - Products Error

private final class PaywallProductsErrorView: NSView, AppearanceRefreshable {
    var onRetry: (() -> Void)?

    private let messageLabel = NSTextField(wrappingLabelWithString: "")
    private let retryButton = PaywallFooterLink(title: "")

    init() {
        super.init(frame: .zero)
        translatesAutoresizingMaskIntoConstraints = false

        messageLabel.font = AppTheme.regularFont(size: 12)
        messageLabel.textColor = AppTheme.textSecondary
        messageLabel.alignment = .center
        messageLabel.maximumNumberOfLines = 3
        messageLabel.lineBreakMode = .byWordWrapping
        messageLabel.cell?.wraps = true
        messageLabel.cell?.isScrollable = false
        messageLabel.translatesAutoresizingMaskIntoConstraints = false

        retryButton.target = self
        retryButton.action = #selector(retryTapped)

        addSubview(messageLabel)
        addSubview(retryButton)

        NSLayoutConstraint.activate([
            messageLabel.leadingAnchor.constraint(equalTo: leadingAnchor),
            messageLabel.trailingAnchor.constraint(equalTo: trailingAnchor),
            messageLabel.topAnchor.constraint(equalTo: topAnchor),

            retryButton.centerXAnchor.constraint(equalTo: centerXAnchor),
            retryButton.topAnchor.constraint(equalTo: messageLabel.bottomAnchor, constant: 8),
            retryButton.bottomAnchor.constraint(equalTo: bottomAnchor),
        ])
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }

    func update(message: String, isRetrying: Bool) {
        let messages = PaywallConfigService.shared.config.messages
        messageLabel.stringValue = message
        retryButton.isHidden = false
        retryButton.isEnabled = !isRetrying
        retryButton.updateTitle(isRetrying ? messages.retrying : messages.retry)
    }

    func refreshAppearance() {
        messageLabel.textColor = AppTheme.textSecondary
        retryButton.refreshAppearance()
    }

    @objc private func retryTapped() {
        onRetry?()
    }
}

// MARK: - Close Button

private final class PaywallCloseButton: NSButton, AppearanceRefreshable {
    private var hoverTracker: HoverTracker?
    private var isHovered = false

    init() {
        super.init(frame: .zero)
        isBordered = false
        bezelStyle = .inline
        translatesAutoresizingMaskIntoConstraints = false
        wantsLayer = true
        layer?.cornerRadius = 15
        layer?.borderWidth = 1.5
        if let image = NSImage(systemSymbolName: "xmark", accessibilityDescription: "Close") {
            let config = NSImage.SymbolConfiguration(pointSize: 12, weight: .semibold)
            self.image = image.withSymbolConfiguration(config)
        }
        refreshAppearance()

        hoverTracker = HoverTracker(view: self) { [weak self] hovering in
            self?.setHovered(hovering)
        }
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }

    func refreshAppearance() {
        updateAppearance()
    }

    private func setHovered(_ hovering: Bool) {
        isHovered = hovering
        animateHover {
            updateAppearance()
            layer?.transform = hovering
                ? CATransform3DMakeScale(1.06, 1.06, 1)
                : CATransform3DIdentity
        }
    }

    private func updateAppearance() {
        if isHovered {
            layer?.backgroundColor = AppTheme.elevatedBackground.cgColor
            layer?.borderColor = AppTheme.paywallAccent.withAlphaComponent(0.45).cgColor
            contentTintColor = AppTheme.textPrimary
        } else {
            layer?.backgroundColor = AppTheme.paywallTrustBackground.cgColor
            layer?.borderColor = AppTheme.paywallBorder.cgColor
            contentTintColor = AppTheme.textSecondary
        }
    }

    override func resetCursorRects() {
        addCursorRect(bounds, cursor: .pointingHand)
    }
}

// MARK: - CTA Button

private final class PaywallCTAButton: NSButton, AppearanceRefreshable {
    private var hoverTracker: HoverTracker?

    init() {
        super.init(frame: .zero)
        isBordered = false
        wantsLayer = true
        layer?.cornerRadius = 12
        font = AppTheme.semiboldFont(size: 15)
        translatesAutoresizingMaskIntoConstraints = false
        refreshAppearance()

        hoverTracker = HoverTracker(view: self) { [weak self] hovering in
            self?.setHovered(hovering)
        }
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }

    func refreshAppearance() {
        layer?.backgroundColor = AppTheme.paywallCTABackground.cgColor
        contentTintColor = AppTheme.paywallCTAForeground
    }

    private func setHovered(_ hovering: Bool) {
        let base = AppTheme.paywallCTABackground
        let color = hovering ? base.blended(withFraction: 0.12, of: .black) ?? base : base
        animateHover {
            layer?.backgroundColor = color.cgColor
            layer?.transform = hovering
                ? CATransform3DMakeScale(1.02, 1.02, 1)
                : CATransform3DIdentity
        }
    }

    override func resetCursorRects() {
        addCursorRect(bounds, cursor: .pointingHand)
    }
}

// MARK: - Main Paywall Card

final class PaywallView: NSView, AppearanceRefreshable {
    var onClose: (() -> Void)?

    private var selectedPlan: PaywallPlan = .yearly
    private var planCards: [PaywallPlan: PaywallPlanCard] = [:]
    private let ctaButton = PaywallCTAButton()
    private let renewalDisclosureLabel = NSTextField(wrappingLabelWithString: "")
    private let continueFreePlanLink = PaywallFooterLink(title: "")
    private let manageSubscriptionLink = PaywallFooterLink(title: "")
    private let restoreLink = PaywallFooterLink(title: "")
    private let privacyLink = PaywallFooterLink(title: "")
    private let termsLink = PaywallFooterLink(title: "")
    private let supportLink = PaywallFooterLink(title: "")
    private let premiumCloseButton = PaywallCloseButton()
    private var primaryFooterLinkCell: NSView?
    private var leftPanelTitle: NSTextField!
    private var rightTitle: NSTextField!
    private var rightSubtitle: NSTextField!
    private var featuresStack: NSStackView!
    private var featureRows: [PaywallFeatureRow] = []
    private var trustItemViews: [PaywallTrustItemView] = []
    private var trustStack: NSStackView!
    private var productsErrorView: PaywallProductsErrorView!
    private var plansStack: NSStackView!
    private var plansStackHeightConstraint: NSLayoutConstraint!
    private var productsErrorHeightConstraint: NSLayoutConstraint!
    private var storeObservers: [NSObjectProtocol] = []

    init() {
        super.init(frame: .zero)
        translatesAutoresizingMaskIntoConstraints = false
        wantsLayer = true
        layer?.cornerRadius = 0
        setup()
        observeStoreUpdates()
        refreshConfigDisplay()
        refreshProductDisplay()
        refreshAppearance()
    }

    deinit {
        storeObservers.forEach { NotificationCenter.default.removeObserver($0) }
    }

    private func observeStoreUpdates() {
        let center = NotificationCenter.default
        storeObservers = [
            center.addObserver(forName: .storeProductsDidUpdate, object: nil, queue: .main) { [weak self] _ in
                self?.refreshProductDisplay()
            },
            center.addObserver(forName: .storeStateDidChange, object: nil, queue: .main) { [weak self] _ in
                self?.refreshProductDisplay()
            },
            center.addObserver(forName: .premiumStatusDidChange, object: nil, queue: .main) { [weak self] _ in
                self?.refreshProductDisplay()
            },
            center.addObserver(forName: .paywallConfigDidUpdate, object: nil, queue: .main) { [weak self] _ in
                self?.refreshConfigDisplay()
                self?.refreshProductDisplay()
            },
        ]
    }

    private var paywallConfig: PaywallConfig {
        PaywallConfigService.shared.config
    }

    private func refreshConfigDisplay() {
        let config = paywallConfig

        leftPanelTitle?.stringValue = config.leftPanelTitle
        rightTitle?.stringValue = config.rightTitle
        rightSubtitle?.stringValue = config.rightSubtitle

        syncFeatureRows(with: config.features)
        syncTrustItems(with: config.trustItems)

        continueFreePlanLink.updateTitle(config.footer.continueFree)
        manageSubscriptionLink.updateTitle(config.footer.manageSubscription)
        restoreLink.updateTitle(config.footer.restorePurchase)
        privacyLink.updateTitle(config.footer.privacyPolicy)
        termsLink.updateTitle(config.footer.termsOfService)
        supportLink.updateTitle(config.footer.support)
    }

    private func syncFeatureRows(with features: [String]) {
        guard let featuresStack else { return }

        while featureRows.count < features.count {
            let row = PaywallFeatureRow(text: "")
            featureRows.append(row)
            featuresStack.addArrangedSubview(row)
        }

        while featureRows.count > features.count {
            let row = featureRows.removeLast()
            featuresStack.removeArrangedSubview(row)
            row.removeFromSuperview()
        }

        for (index, text) in features.enumerated() {
            featureRows[index].updateText(text)
        }
    }

    private func syncTrustItems(with items: [PaywallConfig.TrustItem]) {
        for (index, item) in items.enumerated() where index < trustItemViews.count {
            trustItemViews[index].update(
                iconName: item.icon,
                title: item.title,
                subtitle: item.subtitle
            )
        }
    }

    private func refreshProductDisplay() {
        let store = StoreManager.shared
        let config = paywallConfig
        for (plan, card) in planCards {
            let product = store.product(for: plan)
            card.updateDisplay(
                product: product,
                config: config,
                introOffer: store.eligibleIntroOffer(for: plan)
            )
        }
        ctaButton.title = selectedPlan.localizedCTATitle(
            from: store.product(for: selectedPlan),
            config: config,
            introOffer: store.eligibleIntroOffer(for: selectedPlan)
        )
        updateRenewalDisclosure(
            selectedPlan.localizedRenewalDisclosure(
                from: store.product(for: selectedPlan),
                config: config,
                introOffer: store.eligibleIntroOffer(for: selectedPlan)
            )
        )
        refreshTrustItemsForSelectedPlan()
        refreshProductsErrorState()
        refreshPurchaseState()
    }

    private func refreshProductsErrorState() {
        let store = StoreManager.shared
        let hasLoadFailure = store.productLoadError != nil && store.products.isEmpty
        let isRetrying = hasLoadFailure && store.isLoadingProducts

        productsErrorView.isHidden = !hasLoadFailure
        plansStack.isHidden = hasLoadFailure
        plansStackHeightConstraint.constant = hasLoadFailure ? 0 : plansAreaHeight
        productsErrorHeightConstraint.constant = hasLoadFailure ? productsErrorAreaHeight : 0

        if hasLoadFailure, let error = store.productLoadError {
            productsErrorView.update(message: error, isRetrying: isRetrying)
        }
    }

    private var plansAreaHeight: CGFloat {
        let cardHeight: CGFloat = 86
        let spacing: CGFloat = 12
        let planCount = CGFloat(PaywallPlan.allCases.count)
        return planCount * cardHeight + max(0, planCount - 1) * spacing
    }

    private var productsErrorAreaHeight: CGFloat { 86 }

    private func refreshPurchaseState() {
        let store = StoreManager.shared
        let hasProductLoadFailure = store.productLoadError != nil && store.products.isEmpty
        let isProductReady = store.product(for: selectedPlan) != nil
        let isBusy = store.isPurchasing || store.isLoadingProducts
        let isDisabled = isBusy || !isProductReady || hasProductLoadFailure
        ctaButton.isEnabled = !isDisabled
        ctaButton.alphaValue = isDisabled ? 0.65 : 1
        refreshPrimaryFooterLink()
    }

    private func refreshPrimaryFooterLink() {
        let store = StoreManager.shared
        let showContinue = !store.isPro
        let showManage = store.hasActiveSubscription

        continueFreePlanLink.isHidden = !showContinue
        manageSubscriptionLink.isHidden = !showManage
        premiumCloseButton.isHidden = !store.isPro
        primaryFooterLinkCell?.isHidden = !showContinue && !showManage
        primaryFooterLinkCell?.needsLayout = true
        primaryFooterLinkCell?.layoutSubtreeIfNeeded()
    }

    private func refreshTrustItemsForSelectedPlan() {
        guard trustItemViews.count > 1, paywallConfig.trustItems.count > 1 else { return }

        let cancelItem = paywallConfig.trustItems[1]
        if selectedPlan == .lifetime {
            let item = paywallConfig.lifetimeTrustItem
            trustItemViews[1].update(
                iconName: item.icon,
                title: item.title,
                subtitle: item.subtitle
            )
        } else {
            trustItemViews[1].update(
                iconName: cancelItem.icon,
                title: cancelItem.title,
                subtitle: cancelItem.subtitle
            )
        }
    }

    func refreshStoreState() {
        refreshProductDisplay()
    }

    override func layout() {
        super.layout()
        let width = renewalDisclosureLabel.bounds.width
        guard width > 0, renewalDisclosureLabel.preferredMaxLayoutWidth != width else { return }
        renewalDisclosureLabel.preferredMaxLayoutWidth = width
        renewalDisclosureLabel.invalidateIntrinsicContentSize()
    }

    private func updateRenewalDisclosure(_ text: String) {
        renewalDisclosureLabel.stringValue = text
        renewalDisclosureLabel.invalidateIntrinsicContentSize()
        needsLayout = true
    }

    func refreshAppearance() {
        layer?.backgroundColor = AppTheme.paywallBackground.cgColor
        leftPanelTitle?.refreshThemeLabelColor()
        rightTitle?.refreshThemeLabelColor()
        rightSubtitle?.refreshThemeLabelColor()
        renewalDisclosureLabel.textColor = AppTheme.textSecondary
        trustStack?.layer?.backgroundColor = AppTheme.paywallTrustBackground.cgColor
        trustStack?.layer?.borderColor = AppTheme.paywallBorder.cgColor
        ctaButton.refreshAppearance()
        subviews.forEach { $0.refreshAppearanceRecursively() }
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }

    private func setup() {
        let leftPanel = makeLeftPanel()
        let rightPanel = makeRightPanel()

        premiumCloseButton.target = self
        premiumCloseButton.action = #selector(premiumCloseTapped)
        premiumCloseButton.isHidden = true

        addSubview(leftPanel)
        addSubview(rightPanel)
        addSubview(premiumCloseButton)

        NSLayoutConstraint.activate([
            leftPanel.leadingAnchor.constraint(equalTo: leadingAnchor),
            leftPanel.topAnchor.constraint(equalTo: topAnchor),
            leftPanel.bottomAnchor.constraint(equalTo: bottomAnchor),
            leftPanel.widthAnchor.constraint(equalToConstant: 320),

            rightPanel.leadingAnchor.constraint(equalTo: leftPanel.trailingAnchor),
            rightPanel.trailingAnchor.constraint(equalTo: trailingAnchor),
            rightPanel.topAnchor.constraint(equalTo: topAnchor),
            rightPanel.bottomAnchor.constraint(equalTo: bottomAnchor),

            premiumCloseButton.topAnchor.constraint(equalTo: topAnchor, constant: 16),
            premiumCloseButton.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -16),
            premiumCloseButton.widthAnchor.constraint(equalToConstant: 30),
            premiumCloseButton.heightAnchor.constraint(equalToConstant: 30),
        ])
    }

    private func makeLeftPanel() -> NSView {
        let panel = PaywallLeftPanelView()
        panel.translatesAutoresizingMaskIntoConstraints = false
        let config = paywallConfig

        let title = NSTextField.themeLabel(
            config.leftPanelTitle,
            style: .primary,
            font: AppTheme.semiboldFont(size: 22)
        )
        title.maximumNumberOfLines = 2
        title.translatesAutoresizingMaskIntoConstraints = false
        leftPanelTitle = title

        let featuresStack = NSStackView()
        featuresStack.orientation = .vertical
        featuresStack.spacing = 6
        featuresStack.alignment = .leading
        featuresStack.translatesAutoresizingMaskIntoConstraints = false
        self.featuresStack = featuresStack

        for feature in config.features {
            let row = PaywallFeatureRow(text: feature)
            featureRows.append(row)
            featuresStack.addArrangedSubview(row)
        }

        panel.addSubview(title)
        panel.addSubview(featuresStack)

        NSLayoutConstraint.activate([
            title.leadingAnchor.constraint(equalTo: panel.leadingAnchor, constant: 28),
            title.trailingAnchor.constraint(equalTo: panel.trailingAnchor, constant: -20),
            title.topAnchor.constraint(equalTo: panel.topAnchor, constant: 48),

            featuresStack.leadingAnchor.constraint(equalTo: title.leadingAnchor),
            featuresStack.trailingAnchor.constraint(equalTo: panel.trailingAnchor, constant: -20),
            featuresStack.topAnchor.constraint(equalTo: title.bottomAnchor, constant: 28),
        ])

        return panel
    }

    private func makeRightPanel() -> NSView {
        let panel = NSView()
        panel.translatesAutoresizingMaskIntoConstraints = false
        let config = paywallConfig

        let title = NSTextField.themeLabel(
            config.rightTitle,
            style: .primary,
            font: AppTheme.semiboldFont(size: 26)
        )
        title.alignment = .center
        title.translatesAutoresizingMaskIntoConstraints = false
        rightTitle = title

        let subtitle = NSTextField.themeLabel(
            config.rightSubtitle,
            style: .secondary,
            font: AppTheme.regularFont(size: 13)
        )
        subtitle.alignment = .center
        subtitle.maximumNumberOfLines = 2
        subtitle.translatesAutoresizingMaskIntoConstraints = false
        rightSubtitle = subtitle

        let plansStack = NSStackView()
        plansStack.orientation = .vertical
        plansStack.spacing = 12
        plansStack.translatesAutoresizingMaskIntoConstraints = false
        self.plansStack = plansStack

        let plansAreaView = NSView()
        plansAreaView.translatesAutoresizingMaskIntoConstraints = false

        let productsErrorView = PaywallProductsErrorView()
        productsErrorView.isHidden = true
        productsErrorView.onRetry = { [weak self] in
            self?.retryProductLoad()
        }
        self.productsErrorView = productsErrorView

        for plan in PaywallPlan.allCases {
            let card = PaywallPlanCard(plan: plan)
            card.isChosen = plan == selectedPlan
            card.onSelect = { [weak self] in self?.selectPlan(plan) }
            planCards[plan] = card
            plansStack.addArrangedSubview(card)
        }

        ctaButton.title = selectedPlan.localizedCTATitle(
            from: StoreManager.shared.product(for: selectedPlan),
            config: config,
            introOffer: StoreManager.shared.eligibleIntroOffer(for: selectedPlan)
        )
        ctaButton.target = self
        ctaButton.action = #selector(purchaseTapped)
        ctaButton.translatesAutoresizingMaskIntoConstraints = false

        renewalDisclosureLabel.font = AppTheme.regularFont(size: 10)
        renewalDisclosureLabel.textColor = AppTheme.textSecondary
        renewalDisclosureLabel.alignment = .center
        renewalDisclosureLabel.maximumNumberOfLines = 3
        renewalDisclosureLabel.lineBreakMode = .byWordWrapping
        renewalDisclosureLabel.cell?.wraps = true
        renewalDisclosureLabel.cell?.isScrollable = false
        renewalDisclosureLabel.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
        renewalDisclosureLabel.setContentHuggingPriority(.defaultLow, for: .horizontal)
        renewalDisclosureLabel.setContentHuggingPriority(.required, for: .vertical)
        renewalDisclosureLabel.translatesAutoresizingMaskIntoConstraints = false
        updateRenewalDisclosure(
            selectedPlan.localizedRenewalDisclosure(
                from: StoreManager.shared.product(for: selectedPlan),
                config: config,
                introOffer: StoreManager.shared.eligibleIntroOffer(for: selectedPlan)
            )
        )

        let trustRow = makeTrustRow()
        let footerLinks = makeFooterLinks()

        let footerSpacer = NSView()
        footerSpacer.translatesAutoresizingMaskIntoConstraints = false
        footerSpacer.setContentHuggingPriority(.defaultLow, for: .vertical)
        footerSpacer.setContentCompressionResistancePriority(.defaultLow, for: .vertical)

        plansAreaView.addSubview(plansStack)
        plansAreaView.addSubview(productsErrorView)

        plansStackHeightConstraint = plansStack.heightAnchor.constraint(equalToConstant: plansAreaHeight)
        productsErrorHeightConstraint = productsErrorView.heightAnchor.constraint(equalToConstant: 0)

        panel.addSubview(title)
        panel.addSubview(subtitle)
        panel.addSubview(plansAreaView)
        panel.addSubview(trustRow)
        panel.addSubview(ctaButton)
        panel.addSubview(renewalDisclosureLabel)
        panel.addSubview(footerSpacer)
        panel.addSubview(footerLinks)

        NSLayoutConstraint.activate([
            title.leadingAnchor.constraint(equalTo: panel.leadingAnchor, constant: 28),
            title.topAnchor.constraint(equalTo: panel.topAnchor, constant: 40),
            title.trailingAnchor.constraint(equalTo: panel.trailingAnchor, constant: -28),

            subtitle.leadingAnchor.constraint(equalTo: title.leadingAnchor),
            subtitle.trailingAnchor.constraint(equalTo: panel.trailingAnchor, constant: -28),
            subtitle.topAnchor.constraint(equalTo: title.bottomAnchor, constant: 6),

            plansAreaView.leadingAnchor.constraint(equalTo: title.leadingAnchor),
            plansAreaView.trailingAnchor.constraint(equalTo: panel.trailingAnchor, constant: -28),
            plansAreaView.topAnchor.constraint(equalTo: subtitle.bottomAnchor, constant: 24),
            plansAreaView.heightAnchor.constraint(equalToConstant: plansAreaHeight),

            plansStack.leadingAnchor.constraint(equalTo: plansAreaView.leadingAnchor),
            plansStack.trailingAnchor.constraint(equalTo: plansAreaView.trailingAnchor),
            plansStack.topAnchor.constraint(equalTo: plansAreaView.topAnchor),
            plansStackHeightConstraint,

            productsErrorView.leadingAnchor.constraint(equalTo: plansAreaView.leadingAnchor),
            productsErrorView.trailingAnchor.constraint(equalTo: plansAreaView.trailingAnchor),
            productsErrorView.topAnchor.constraint(equalTo: plansAreaView.topAnchor),
            productsErrorHeightConstraint,

            trustRow.leadingAnchor.constraint(equalTo: plansAreaView.leadingAnchor),
            trustRow.trailingAnchor.constraint(equalTo: plansAreaView.trailingAnchor),
            trustRow.topAnchor.constraint(equalTo: plansAreaView.bottomAnchor, constant: 18),

            ctaButton.leadingAnchor.constraint(equalTo: plansAreaView.leadingAnchor),
            ctaButton.trailingAnchor.constraint(equalTo: plansAreaView.trailingAnchor),
            ctaButton.topAnchor.constraint(equalTo: trustRow.bottomAnchor, constant: 16),
            ctaButton.heightAnchor.constraint(equalToConstant: 48),

            renewalDisclosureLabel.leadingAnchor.constraint(equalTo: plansAreaView.leadingAnchor),
            renewalDisclosureLabel.trailingAnchor.constraint(equalTo: plansAreaView.trailingAnchor),
            renewalDisclosureLabel.topAnchor.constraint(equalTo: ctaButton.bottomAnchor, constant: 10),

            footerSpacer.leadingAnchor.constraint(equalTo: panel.leadingAnchor),
            footerSpacer.trailingAnchor.constraint(equalTo: panel.trailingAnchor),
            footerSpacer.topAnchor.constraint(equalTo: renewalDisclosureLabel.bottomAnchor, constant: 16),
            footerSpacer.bottomAnchor.constraint(equalTo: footerLinks.topAnchor),

            footerLinks.leadingAnchor.constraint(equalTo: panel.leadingAnchor, constant: 28),
            footerLinks.trailingAnchor.constraint(equalTo: panel.trailingAnchor, constant: -28),
            footerLinks.bottomAnchor.constraint(equalTo: panel.bottomAnchor, constant: -16),
        ])

        return panel
    }

    private func makeTrustRow() -> NSView {
        let config = paywallConfig
        trustItemViews = config.trustItems.map { item in
            PaywallTrustItemView(
                iconName: item.icon,
                title: item.title,
                subtitle: item.subtitle
            )
        }

        let trustStack = NSStackView(views: trustItemViews)
        trustStack.orientation = .horizontal
        trustStack.distribution = .fillEqually
        trustStack.spacing = 16
        trustStack.alignment = .top
        trustStack.translatesAutoresizingMaskIntoConstraints = false
        trustStack.wantsLayer = true
        trustStack.layer?.cornerRadius = 12
        trustStack.layer?.borderWidth = 1.5
        trustStack.layer?.masksToBounds = true
        trustStack.edgeInsets = NSEdgeInsets(top: 12, left: 14, bottom: 12, right: 14)
        trustStack.translatesAutoresizingMaskIntoConstraints = false
        trustStack.setContentHuggingPriority(.required, for: .vertical)
        trustStack.setContentCompressionResistancePriority(.required, for: .vertical)
        trustStack.heightAnchor.constraint(
            equalToConstant: PaywallTrustItemView.preferredHeight + trustStack.edgeInsets.top + trustStack.edgeInsets.bottom
        ).isActive = true
        self.trustStack = trustStack

        return trustStack
    }

    private func makeFooterLinks() -> NSView {
        let container = NSView()
        container.translatesAutoresizingMaskIntoConstraints = false
        container.setContentHuggingPriority(.required, for: .vertical)
        container.setContentCompressionResistancePriority(.required, for: .vertical)
        let config = paywallConfig

        let separator = NSView()
        separator.translatesAutoresizingMaskIntoConstraints = false
        separator.wantsLayer = true
        separator.layer?.backgroundColor = AppTheme.paywallBorder.cgColor

        continueFreePlanLink.updateTitle(config.footer.continueFree)
        continueFreePlanLink.target = self
        continueFreePlanLink.action = #selector(continueWithFreePlanTapped)

        manageSubscriptionLink.updateTitle(config.footer.manageSubscription)
        manageSubscriptionLink.target = self
        manageSubscriptionLink.action = #selector(manageSubscriptionTapped)

        let primaryCell = makePrimaryFooterLinkCell()
        primaryFooterLinkCell = primaryCell
        refreshPrimaryFooterLink()

        restoreLink.updateTitle(config.footer.restorePurchase)
        restoreLink.target = self
        restoreLink.action = #selector(restoreTapped)

        privacyLink.updateTitle(config.footer.privacyPolicy)
        privacyLink.target = self
        privacyLink.action = #selector(privacyPolicyTapped)

        termsLink.updateTitle(config.footer.termsOfService)
        termsLink.target = self
        termsLink.action = #selector(termsOfServiceTapped)

        supportLink.updateTitle(config.footer.support)
        supportLink.target = self
        supportLink.action = #selector(supportTapped)

        let linkCells = [
            primaryCell,
            makeFooterLinkCell(link: restoreLink),
            makeFooterLinkCell(link: privacyLink),
            makeFooterLinkCell(link: termsLink),
            makeFooterLinkCell(link: supportLink),
        ]

        let linksStack = NSStackView(views: linkCells)
        linksStack.orientation = .horizontal
        linksStack.spacing = 0
        linksStack.alignment = .centerY
        linksStack.distribution = .fillEqually
        linksStack.translatesAutoresizingMaskIntoConstraints = false

        container.addSubview(separator)
        container.addSubview(linksStack)
        NSLayoutConstraint.activate([
            separator.leadingAnchor.constraint(equalTo: container.leadingAnchor),
            separator.trailingAnchor.constraint(equalTo: container.trailingAnchor),
            separator.topAnchor.constraint(equalTo: container.topAnchor),
            separator.heightAnchor.constraint(equalToConstant: 1),

            linksStack.leadingAnchor.constraint(equalTo: container.leadingAnchor),
            linksStack.trailingAnchor.constraint(equalTo: container.trailingAnchor),
            linksStack.topAnchor.constraint(equalTo: separator.bottomAnchor, constant: 10),
            linksStack.bottomAnchor.constraint(equalTo: container.bottomAnchor),
        ])

        return container
    }

    private func makePrimaryFooterLinkCell() -> NSView {
        let cell = NSView()
        cell.translatesAutoresizingMaskIntoConstraints = false
        cell.setContentHuggingPriority(.required, for: .vertical)
        cell.setContentCompressionResistancePriority(.required, for: .vertical)

        for link in [continueFreePlanLink, manageSubscriptionLink] {
            cell.addSubview(link)
            NSLayoutConstraint.activate([
                link.centerXAnchor.constraint(equalTo: cell.centerXAnchor),
                link.centerYAnchor.constraint(equalTo: cell.centerYAnchor),
                link.topAnchor.constraint(equalTo: cell.topAnchor),
                link.bottomAnchor.constraint(equalTo: cell.bottomAnchor),
            ])
        }

        return cell
    }

    private func makeFooterLinkCell(link: PaywallFooterLink) -> NSView {
        let cell = NSView()
        cell.translatesAutoresizingMaskIntoConstraints = false
        cell.setContentHuggingPriority(.required, for: .vertical)
        cell.setContentCompressionResistancePriority(.required, for: .vertical)

        cell.addSubview(link)
        NSLayoutConstraint.activate([
            link.centerXAnchor.constraint(equalTo: cell.centerXAnchor),
            link.centerYAnchor.constraint(equalTo: cell.centerYAnchor),
            link.topAnchor.constraint(equalTo: cell.topAnchor),
            link.bottomAnchor.constraint(equalTo: cell.bottomAnchor),
        ])

        return cell
    }

    private func selectPlan(_ plan: PaywallPlan) {
        selectedPlan = plan
        for (key, card) in planCards {
            card.isChosen = key == plan
        }
        ctaButton.title = plan.localizedCTATitle(
            from: StoreManager.shared.product(for: plan),
            config: paywallConfig,
            introOffer: StoreManager.shared.eligibleIntroOffer(for: plan)
        )
        updateRenewalDisclosure(
            plan.localizedRenewalDisclosure(
                from: StoreManager.shared.product(for: plan),
                config: paywallConfig,
                introOffer: StoreManager.shared.eligibleIntroOffer(for: plan)
            )
        )
        refreshTrustItemsForSelectedPlan()
        refreshPurchaseState()
    }

    private func retryProductLoad() {
        Task { @MainActor in
            refreshProductsErrorState()
            refreshPurchaseState()
            await StoreManager.shared.loadProducts()
            refreshStoreState()
        }
    }

    @objc private func purchaseTapped() {
        Task { @MainActor in
            refreshPurchaseState()
            do {
                let outcome = try await StoreManager.shared.purchase(plan: selectedPlan)
                refreshStoreState()
                switch outcome {
                case .purchased, .cancelled:
                    break
                case .pending:
                    let messages = paywallConfig.messages
                    StoreManager.shared.showAlert(
                        title: messages.pendingPurchaseTitle,
                        message: messages.pendingPurchaseMessage,
                        on: window
                    )
                }
            } catch {
                refreshPurchaseState()
                StoreManager.shared.showPurchaseError(error, on: window)
            }
        }
    }

    @objc private func restoreTapped() {
        Task { @MainActor in
            refreshPurchaseState()
            do {
                let restored = try await StoreManager.shared.restorePurchases()
                refreshStoreState()
                if !restored {
                    let messages = paywallConfig.messages
                    StoreManager.shared.showAlert(
                        title: messages.restoreNotFoundTitle,
                        message: messages.restoreNotFoundMessage,
                        on: window
                    )
                }
            } catch {
                refreshPurchaseState()
                StoreManager.shared.showPurchaseError(error, on: window)
            }
        }
    }

    @objc private func continueWithFreePlanTapped() {
        onClose?()
    }

    @objc private func premiumCloseTapped() {
        onClose?()
    }

    @objc private func manageSubscriptionTapped() {
        StoreManager.shared.showManageSubscriptions()
    }

    @objc private func privacyPolicyTapped() {
        openExternalLink(paywallConfig.urls.privacy)
    }

    @objc private func termsOfServiceTapped() {
        openExternalLink(paywallConfig.urls.terms)
    }

    @objc private func supportTapped() {
        openExternalLink(paywallConfig.urls.support)
    }

    private func openExternalLink(_ urlString: String) {
        guard let url = URL(string: urlString) else { return }
        NSWorkspace.shared.open(url)
    }
}

// MARK: - Overlay Presenter

final class PaywallOverlayView: NSView, AppearanceRefreshable {
    var onDismiss: (() -> Void)?

    private let paywallView: PaywallView
    private let blurView = NSVisualEffectView()
    private let backdrop = NSView()
    private let pattern = WavePatternView()
    private var acceptsHitTesting = false

    init() {
        paywallView = PaywallView()
        super.init(frame: .zero)
        translatesAutoresizingMaskIntoConstraints = false
        setup()
        refreshAppearance()
    }

    func refreshAppearance() {
        backdrop.layer?.backgroundColor = AppTheme.paywallOverlayBackdrop.cgColor
        blurView.material = AppSettings.darkModeEnabled ? .hudWindow : .underWindowBackground
        pattern.refreshAppearance()
        paywallView.refreshAppearance()
    }

    func refreshStoreState() {
        paywallView.refreshStoreState()
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) { nil }

    override func hitTest(_ point: NSPoint) -> NSView? {
        guard acceptsHitTesting else { return nil }
        return super.hitTest(point)
    }

    private func setup() {
        blurView.translatesAutoresizingMaskIntoConstraints = false
        blurView.material = .underWindowBackground
        blurView.blendingMode = .withinWindow
        blurView.state = .active

        backdrop.translatesAutoresizingMaskIntoConstraints = false
        backdrop.wantsLayer = true
        backdrop.layer?.backgroundColor = NSColor(calibratedWhite: 0.15, alpha: 0.22).cgColor

        pattern.translatesAutoresizingMaskIntoConstraints = false
        pattern.alphaValue = 0.35

        paywallView.translatesAutoresizingMaskIntoConstraints = false
        paywallView.onClose = { [weak self] in self?.dismiss() }

        addSubview(blurView)
        addSubview(backdrop)
        backdrop.addSubview(pattern)
        addSubview(paywallView)

        NSLayoutConstraint.activate([
            blurView.leadingAnchor.constraint(equalTo: leadingAnchor),
            blurView.trailingAnchor.constraint(equalTo: trailingAnchor),
            blurView.topAnchor.constraint(equalTo: topAnchor),
            blurView.bottomAnchor.constraint(equalTo: bottomAnchor),

            backdrop.leadingAnchor.constraint(equalTo: leadingAnchor),
            backdrop.trailingAnchor.constraint(equalTo: trailingAnchor),
            backdrop.topAnchor.constraint(equalTo: topAnchor),
            backdrop.bottomAnchor.constraint(equalTo: bottomAnchor),

            pattern.leadingAnchor.constraint(equalTo: backdrop.leadingAnchor),
            pattern.trailingAnchor.constraint(equalTo: backdrop.trailingAnchor),
            pattern.topAnchor.constraint(equalTo: backdrop.topAnchor),
            pattern.bottomAnchor.constraint(equalTo: backdrop.bottomAnchor),

            paywallView.leadingAnchor.constraint(equalTo: leadingAnchor),
            paywallView.trailingAnchor.constraint(equalTo: trailingAnchor),
            paywallView.topAnchor.constraint(equalTo: topAnchor),
            paywallView.bottomAnchor.constraint(equalTo: bottomAnchor),
        ])
    }

    func present(in parent: NSView) {
        guard superview == nil else { return }
        if let window = parent.window,
           let windowFrameView = window.contentView?.superview {
            windowFrameView.addSubview(self)
            NSLayoutConstraint.activate([
                leadingAnchor.constraint(equalTo: windowFrameView.leadingAnchor),
                trailingAnchor.constraint(equalTo: windowFrameView.trailingAnchor),
                topAnchor.constraint(equalTo: windowFrameView.topAnchor),
                bottomAnchor.constraint(equalTo: windowFrameView.bottomAnchor),
            ])
        } else {
            parent.addSubview(self)
            NSLayoutConstraint.activate([
                leadingAnchor.constraint(equalTo: parent.leadingAnchor),
                trailingAnchor.constraint(equalTo: parent.trailingAnchor),
                topAnchor.constraint(equalTo: parent.topAnchor),
                bottomAnchor.constraint(equalTo: parent.bottomAnchor),
            ])
        }
        alphaValue = 1
        acceptsHitTesting = true
        paywallView.refreshStoreState()

        Task { @MainActor in
            if StoreManager.shared.isResolvingEntitlements {
                await StoreManager.shared.ensureEntitlementsResolved()
                paywallView.refreshStoreState()
            }
            if StoreManager.shared.products.isEmpty, !StoreManager.shared.isLoadingProducts {
                await StoreManager.shared.loadProducts()
                paywallView.refreshStoreState()
            }
        }

        Task { @MainActor in
            await PaywallConfigService.shared.refreshFromRemote()
        }
    }

    func dismiss() {
        acceptsHitTesting = false
        NSAnimationContext.runAnimationGroup({ context in
            context.duration = 0.15
            animator().alphaValue = 0
        }, completionHandler: { [weak self] in
            self?.removeFromSuperview()
            self?.onDismiss?()
        })
    }
}