import Cocoa
import StoreKit

final class PremiumPlansWindowController: NSWindowController {
    /// Matches `PremiumPlansViewController.Theme.pageStart` so the window backing fills sheet corners.
    static let paywallSheetBackground = NSColor(srgbRed: 249 / 255, green: 252 / 255, blue: 255 / 255, alpha: 1)

    init() {
        let viewController = PremiumPlansViewController()
        let window = NSWindow(contentViewController: viewController)
        window.title = "Premium Plans"
        // Borderless avoids titled-window chrome: its rounded titlebar frame often leaves dark wedges at
        // the corners when combined with a custom full-bleed paywall (this window is only shown as a sheet).
        window.styleMask = [.borderless, .closable, .resizable]
        window.isOpaque = true
        window.backgroundColor = Self.paywallSheetBackground
        window.setContentSize(NSSize(width: 1160, height: 760))
        window.minSize = NSSize(width: 980, height: 680)
        window.isRestorable = false
        window.center()
        super.init(window: window)
    }

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

private final class PremiumPlansViewController: NSViewController {
    private final class HoverPricingCardView: NSView {
        private let baseBorderColor: NSColor
        private let hoverBorderColor: NSColor
        private var trackingAreaRef: NSTrackingArea?

        init(baseBorderColor: NSColor, hoverBorderColor: NSColor) {
            self.baseBorderColor = baseBorderColor
            self.hoverBorderColor = hoverBorderColor
            super.init(frame: .zero)
            wantsLayer = true
            layer?.cornerRadius = 16
            applyHoverStyle(isHovered: false, animated: false)
        }

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

        override func updateTrackingAreas() {
            super.updateTrackingAreas()
            if let trackingAreaRef {
                removeTrackingArea(trackingAreaRef)
            }
            let options: NSTrackingArea.Options = [.activeInActiveApp, .mouseEnteredAndExited, .inVisibleRect]
            let area = NSTrackingArea(rect: .zero, options: options, owner: self, userInfo: nil)
            addTrackingArea(area)
            trackingAreaRef = area
        }

        override func mouseEntered(with event: NSEvent) {
            super.mouseEntered(with: event)
            applyHoverStyle(isHovered: true, animated: true)
        }

        override func mouseExited(with event: NSEvent) {
            super.mouseExited(with: event)
            applyHoverStyle(isHovered: false, animated: true)
        }

        private func applyHoverStyle(isHovered: Bool, animated: Bool) {
            guard let layer else { return }
            let updates = {
                layer.borderWidth = isHovered ? 2 : 1
                layer.borderColor = (isHovered ? self.hoverBorderColor : self.baseBorderColor).cgColor
                layer.shadowColor = self.hoverBorderColor.withAlphaComponent(0.35).cgColor
                layer.shadowOpacity = isHovered ? 0.22 : 0
                layer.shadowRadius = isHovered ? 14 : 0
                layer.shadowOffset = .init(width: 0, height: -2)
            }

            if animated {
                NSAnimationContext.runAnimationGroup { context in
                    context.duration = 0.16
                    updates()
                }
            } else {
                updates()
            }
        }
    }

    /// Footer text actions: accent color + pointing hand on hover (matches pricing-card tracking behavior).
    private final class FooterLinkButton: NSButton {
        private var trackingAreaRef: NSTrackingArea?
        private var didPushCursor = false

        override func updateTrackingAreas() {
            super.updateTrackingAreas()
            if let trackingAreaRef {
                removeTrackingArea(trackingAreaRef)
            }
            let options: NSTrackingArea.Options = [.activeInActiveApp, .mouseEnteredAndExited, .inVisibleRect]
            let area = NSTrackingArea(rect: .zero, options: options, owner: self, userInfo: nil)
            addTrackingArea(area)
            trackingAreaRef = area
        }

        override func mouseEntered(with event: NSEvent) {
            super.mouseEntered(with: event)
            setHoverVisuals(hovered: true)
            if !didPushCursor {
                NSCursor.pointingHand.push()
                didPushCursor = true
            }
        }

        override func mouseExited(with event: NSEvent) {
            super.mouseExited(with: event)
            setHoverVisuals(hovered: false)
            if didPushCursor {
                NSCursor.pop()
                didPushCursor = false
            }
        }

        override func viewWillMove(toWindow newWindow: NSWindow?) {
            super.viewWillMove(toWindow: newWindow)
            if newWindow == nil, didPushCursor {
                NSCursor.pop()
                didPushCursor = false
            }
            if newWindow == nil {
                setHoverVisuals(hovered: false, animated: false)
            }
        }

        private func setHoverVisuals(hovered: Bool, animated: Bool = true) {
            let color = hovered ? Theme.accent : Theme.secondaryText
            if animated {
                NSAnimationContext.runAnimationGroup { context in
                    context.duration = 0.15
                    self.animator().contentTintColor = color
                }
            } else {
                contentTintColor = color
            }
        }
    }

    /// Purchase CTAs: fill/border/shadow + pointing hand on hover.
    private final class PlanPurchaseHoverButton: NSButton {
        private var trackingAreaRef: NSTrackingArea?
        private var didPushCursor = false
        private let isPrimaryStyle: Bool

        private static let primaryFill = NSColor(srgbRed: 189 / 255, green: 52 / 255, blue: 255 / 255, alpha: 1)
        private static let primaryFillHover = NSColor(srgbRed: 205 / 255, green: 88 / 255, blue: 255 / 255, alpha: 1)

        init(planId: String, title: String, isPrimaryStyle: Bool, target: AnyObject?, action: Selector) {
            self.isPrimaryStyle = isPrimaryStyle
            super.init(frame: .zero)
            identifier = NSUserInterfaceItemIdentifier(planId)
            self.title = title
            self.target = target
            self.action = action
            isBordered = false
            bezelStyle = .rounded
            font = .systemFont(ofSize: 14, weight: .semibold)
            wantsLayer = true
            layer?.cornerRadius = 12
            focusRingType = .none
            translatesAutoresizingMaskIntoConstraints = false
            applyBaseStyle(hovered: false)
        }

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

        override var isEnabled: Bool {
            didSet {
                if !isEnabled {
                    applyBaseStyle(hovered: false, animated: true)
                    if didPushCursor {
                        NSCursor.pop()
                        didPushCursor = false
                    }
                }
            }
        }

        override func updateTrackingAreas() {
            super.updateTrackingAreas()
            if let trackingAreaRef {
                removeTrackingArea(trackingAreaRef)
            }
            let options: NSTrackingArea.Options = [.activeInActiveApp, .mouseEnteredAndExited, .inVisibleRect]
            let area = NSTrackingArea(rect: .zero, options: options, owner: self, userInfo: nil)
            addTrackingArea(area)
            trackingAreaRef = area
        }

        override func mouseEntered(with event: NSEvent) {
            super.mouseEntered(with: event)
            guard isEnabled else { return }
            applyBaseStyle(hovered: true, animated: true)
            if !didPushCursor {
                NSCursor.pointingHand.push()
                didPushCursor = true
            }
        }

        override func mouseExited(with event: NSEvent) {
            super.mouseExited(with: event)
            applyBaseStyle(hovered: false, animated: true)
            if didPushCursor {
                NSCursor.pop()
                didPushCursor = false
            }
        }

        override func viewWillMove(toWindow newWindow: NSWindow?) {
            super.viewWillMove(toWindow: newWindow)
            if newWindow == nil, didPushCursor {
                NSCursor.pop()
                didPushCursor = false
            }
            if newWindow == nil {
                applyBaseStyle(hovered: false, animated: false)
            }
        }

        private func applyBaseStyle(hovered: Bool, animated: Bool = true) {
            let updates = {
                if self.isPrimaryStyle {
                    self.layer?.backgroundColor = (hovered ? Self.primaryFillHover : Self.primaryFill).cgColor
                    self.layer?.borderColor = Theme.accent.cgColor
                    self.layer?.borderWidth = hovered ? 2 : 1
                    self.contentTintColor = .white
                    self.layer?.shadowColor = Self.primaryFill.cgColor
                    self.layer?.shadowOpacity = hovered ? 0.28 : 0
                    self.layer?.shadowRadius = hovered ? 12 : 0
                    self.layer?.shadowOffset = CGSize(width: 0, height: -2)
                } else {
                    let baseFill = Theme.mutedButtonFill
                    let hoverFill = baseFill.blended(withFraction: 0.22, of: Theme.accent) ?? baseFill
                    self.layer?.backgroundColor = (hovered ? hoverFill : baseFill).cgColor
                    self.layer?.borderColor = (hovered ? Theme.accent : Theme.divider).cgColor
                    self.layer?.borderWidth = hovered ? 2 : 1
                    self.contentTintColor = Theme.primaryText
                    self.layer?.shadowColor = Theme.accent.withAlphaComponent(0.35).cgColor
                    self.layer?.shadowOpacity = hovered ? 0.18 : 0
                    self.layer?.shadowRadius = hovered ? 10 : 0
                    self.layer?.shadowOffset = CGSize(width: 0, height: -2)
                }
            }
            if animated {
                NSAnimationContext.runAnimationGroup { context in
                    context.duration = 0.16
                    updates()
                }
            } else {
                updates()
            }
        }
    }

    /// Close control: subtle lift + accent tint on hover.
    private final class PremiumCloseHoverButton: NSButton {
        private var trackingAreaRef: NSTrackingArea?
        private var didPushCursor = false

        init(target: AnyObject?, action: Selector) {
            super.init(frame: .zero)
            self.target = target
            self.action = action
            isBordered = false
            wantsLayer = true
            layer?.cornerRadius = 15
            bezelStyle = .regularSquare
            image = NSImage(systemSymbolName: "xmark", accessibilityDescription: "Close")
            imageScaling = .scaleProportionallyDown
            focusRingType = .none
            translatesAutoresizingMaskIntoConstraints = false
            applyStyle(hovered: false, animated: false)
        }

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

        override func updateTrackingAreas() {
            super.updateTrackingAreas()
            if let trackingAreaRef {
                removeTrackingArea(trackingAreaRef)
            }
            let options: NSTrackingArea.Options = [.activeInActiveApp, .mouseEnteredAndExited, .inVisibleRect]
            let area = NSTrackingArea(rect: .zero, options: options, owner: self, userInfo: nil)
            addTrackingArea(area)
            trackingAreaRef = area
        }

        override func mouseEntered(with event: NSEvent) {
            super.mouseEntered(with: event)
            applyStyle(hovered: true, animated: true)
            if !didPushCursor {
                NSCursor.pointingHand.push()
                didPushCursor = true
            }
        }

        override func mouseExited(with event: NSEvent) {
            super.mouseExited(with: event)
            applyStyle(hovered: false, animated: true)
            if didPushCursor {
                NSCursor.pop()
                didPushCursor = false
            }
        }

        override func viewWillMove(toWindow newWindow: NSWindow?) {
            super.viewWillMove(toWindow: newWindow)
            if newWindow == nil, didPushCursor {
                NSCursor.pop()
                didPushCursor = false
            }
            if newWindow == nil {
                applyStyle(hovered: false, animated: false)
            }
        }

        private func applyStyle(hovered: Bool, animated: Bool) {
            let updates = {
                self.layer?.backgroundColor = (hovered
                    ? NSColor.white.withAlphaComponent(0.98)
                    : NSColor.white.withAlphaComponent(0.92)).cgColor
                self.layer?.borderColor = (hovered ? Theme.accent.withAlphaComponent(0.45) : Theme.divider).cgColor
                self.layer?.borderWidth = hovered ? 1.5 : 1
                self.contentTintColor = hovered ? Theme.accent : Theme.secondaryText
                self.layer?.shadowColor = Theme.accent.withAlphaComponent(0.25).cgColor
                self.layer?.shadowOpacity = hovered ? 0.2 : 0
                self.layer?.shadowRadius = hovered ? 8 : 0
                self.layer?.shadowOffset = CGSize(width: 0, height: -1)
            }
            if animated {
                NSAnimationContext.runAnimationGroup { context in
                    context.duration = 0.15
                    updates()
                }
            } else {
                updates()
            }
        }
    }

    /// Shown until StoreKit returns localized `Product.displayPrice` (never use hardcoded currency amounts).
    private static let unloadedPricePlaceholder = "—"

    private struct Plan {
        let id: String
        let title: String
        let subtitle: String
        let period: String
        let billedPill: String
        let billedLine: String
        let crossedPrice: String?
        let savingsText: String?
        let features: [String]
        let iconName: String
        let iconTint: NSColor
        let highlight: Bool
    }

    private enum Theme {
        static let pageStart = NSColor(srgbRed: 249 / 255, green: 252 / 255, blue: 255 / 255, alpha: 1)
        static let pageEnd = NSColor(srgbRed: 238 / 255, green: 244 / 255, blue: 255 / 255, alpha: 1)
        static let cardBackground = NSColor.white
        static let primaryText = NSColor(srgbRed: 27 / 255, green: 38 / 255, blue: 79 / 255, alpha: 1)
        static let secondaryText = NSColor(srgbRed: 108 / 255, green: 120 / 255, blue: 157 / 255, alpha: 1)
        static let cardBorder = NSColor(srgbRed: 198 / 255, green: 216 / 255, blue: 255 / 255, alpha: 1)
        static let accent = NSColor(srgbRed: 55 / 255, green: 128 / 255, blue: 255 / 255, alpha: 1)
        static let accentHover = NSColor(srgbRed: 38 / 255, green: 108 / 255, blue: 232 / 255, alpha: 1)
        static let mutedButtonFill = NSColor(srgbRed: 238 / 255, green: 243 / 255, blue: 252 / 255, alpha: 1)
        static let bottomStrip = NSColor(srgbRed: 244 / 255, green: 248 / 255, blue: 255 / 255, alpha: 1)
        static let divider = NSColor(srgbRed: 218 / 255, green: 228 / 255, blue: 247 / 255, alpha: 1)
        static let successText = NSColor(srgbRed: 21 / 255, green: 154 / 255, blue: 220 / 255, alpha: 1)
        static let iconTint = NSColor(srgbRed: 47 / 255, green: 136 / 255, blue: 255 / 255, alpha: 1)
    }

    private enum FeatureListMetrics {
        static let spacing = CGFloat(10)
        static let edgeInsets = NSEdgeInsets(top: 21, left: 37, bottom: 21, right: 0)
    }

    private let subscriptionStore = SubscriptionStore.shared
    private var planPriceFields: [String: (price: NSTextField, period: NSTextField)] = [:]
    private var planPurchaseButtons: [String: NSButton] = [:]
    private var subscriptionPrimaryFooterButton: NSButton?
    private var premiumCloseButton: NSButton?
    private var subscriptionStatusObservation: NSObjectProtocol?

    private let plans: [Plan] = [
        Plan(
            id: "weekly",
            title: "Weekly",
            subtitle: "Flexible and commitment-free",
            period: "/ week",
            billedPill: "",
            billedLine: "",
            crossedPrice: nil,
            savingsText: nil,
            features: [
                "All premium features",
                "Perfect for short-term goals",
                "Cancel anytime"
            ],
            iconName: "paperplane.fill",
            iconTint: Theme.iconTint,
            highlight: false
        ),
        Plan(
            id: "monthly",
            title: "Monthly",
            subtitle: "Balanced for regular productivity",
            period: "/ month",
            billedPill: "",
            billedLine: "",
            crossedPrice: nil,
            savingsText: nil,
            features: [
                "All premium features",
                "Best value for regular users",
                "Priority support"
            ],
            iconName: "bolt.fill",
            iconTint: Theme.accent,
            highlight: true
        ),
        Plan(
            id: "yearly",
            title: "Yearly",
            subtitle: "Best value for long-term users",
            period: "/ year",
            billedPill: "3 days free trial",
            billedLine: "",
            crossedPrice: nil,
            savingsText: nil,
            features: [
                "All premium features",
                "Lowest effective monthly cost",
                "Ideal for long-term use"
            ],
            iconName: "crown.fill",
            iconTint: Theme.successText,
            highlight: false
        )
    ]

    private let pageGradient = CAGradientLayer()

    deinit {
        if let subscriptionStatusObservation {
            NotificationCenter.default.removeObserver(subscriptionStatusObservation)
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        subscriptionStatusObservation = NotificationCenter.default.addObserver(
            forName: .subscriptionStatusDidChange,
            object: nil,
            queue: .main
        ) { [weak self] _ in
            Task { @MainActor in
                await self?.subscriptionStore.loadProducts()
                self?.applyStorePricing()
                self?.updateSubscriptionPrimaryFooter()
                self?.updatePremiumCloseButtonVisibility()
            }
        }
        Task { @MainActor in
            await loadStoreProducts()
        }
    }

    override func viewDidLayout() {
        super.viewDidLayout()
        pageGradient.frame = view.bounds
    }

    override func loadView() {
        view = NSView()
        view.wantsLayer = true
        pageGradient.colors = [Theme.pageStart.cgColor, Theme.pageEnd.cgColor]
        pageGradient.startPoint = CGPoint(x: 0, y: 1)
        pageGradient.endPoint = CGPoint(x: 1, y: 0)
        view.layer?.addSublayer(pageGradient)
        setupLayout()
    }

    private func setupLayout() {
        let closeButton = PremiumCloseHoverButton(target: self, action: #selector(didTapClose))

        let crownIcon = NSImageView()
        crownIcon.translatesAutoresizingMaskIntoConstraints = false
        crownIcon.symbolConfiguration = NSImage.SymbolConfiguration(pointSize: 18, weight: .semibold)
        crownIcon.image = NSImage(systemSymbolName: "crown.fill", accessibilityDescription: nil)
        crownIcon.contentTintColor = NSColor(srgbRed: 254 / 255, green: 214 / 255, blue: 92 / 255, alpha: 1)

        let title = NSTextField(labelWithString: "Upgrade to Pro")
        title.font = .systemFont(ofSize: 40, weight: .semibold)
        title.textColor = Theme.primaryText
        title.alignment = .center

        let subtitle = NSTextField(labelWithString: "Unlock unlimited access to premium tools and boost your productivity.")
        subtitle.font = .systemFont(ofSize: 14, weight: .regular)
        subtitle.textColor = Theme.secondaryText
        subtitle.alignment = .center

        let cardsRow = NSStackView(views: plans.map(makePricingCard(_:)))
        cardsRow.orientation = .horizontal
        cardsRow.spacing = 14
        cardsRow.alignment = .top
        cardsRow.distribution = .fillEqually
        cardsRow.translatesAutoresizingMaskIntoConstraints = false
        for card in cardsRow.arrangedSubviews {
            card.heightAnchor.constraint(equalTo: cardsRow.heightAnchor).isActive = true
        }

        let trustRow = makeTrustRow()
        let footerRow = makeFooterRow()

        let root = NSStackView(views: [crownIcon, title, subtitle, cardsRow, trustRow, footerRow])
        root.orientation = .vertical
        root.spacing = 18
        root.alignment = .centerX
        root.translatesAutoresizingMaskIntoConstraints = false

        view.addSubview(root)
        view.addSubview(closeButton)
        NSLayoutConstraint.activate([
            root.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 24),
            root.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -24),
            root.topAnchor.constraint(equalTo: view.topAnchor, constant: 20),
            root.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -16),
            closeButton.topAnchor.constraint(equalTo: view.topAnchor, constant: 14),
            closeButton.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -14),
            closeButton.widthAnchor.constraint(equalToConstant: 30),
            closeButton.heightAnchor.constraint(equalToConstant: 30),
            cardsRow.widthAnchor.constraint(equalTo: root.widthAnchor),
            cardsRow.heightAnchor.constraint(equalToConstant: 420),
            trustRow.widthAnchor.constraint(equalTo: root.widthAnchor),
            footerRow.widthAnchor.constraint(equalTo: root.widthAnchor),
            crownIcon.heightAnchor.constraint(equalToConstant: 20)
        ])
        premiumCloseButton = closeButton
        updatePremiumCloseButtonVisibility()
    }

    private func updatePremiumCloseButtonVisibility() {
        premiumCloseButton?.isHidden = !subscriptionStore.isProActive
    }

    private func makePricingCard(_ plan: Plan) -> NSView {
        let card = HoverPricingCardView(baseBorderColor: Theme.cardBorder, hoverBorderColor: Theme.accent)
        card.translatesAutoresizingMaskIntoConstraints = false
        card.layer?.backgroundColor = Theme.cardBackground.cgColor

        let iconWell = NSView()
        iconWell.translatesAutoresizingMaskIntoConstraints = false
        iconWell.wantsLayer = true
        iconWell.layer?.cornerRadius = 10
        iconWell.layer?.backgroundColor = Theme.bottomStrip.cgColor
        iconWell.widthAnchor.constraint(equalToConstant: 24).isActive = true
        iconWell.heightAnchor.constraint(equalToConstant: 24).isActive = true

        let icon = NSImageView()
        icon.translatesAutoresizingMaskIntoConstraints = false
        icon.symbolConfiguration = NSImage.SymbolConfiguration(pointSize: 11, weight: .bold)
        icon.image = NSImage(systemSymbolName: plan.iconName, accessibilityDescription: nil)
        icon.contentTintColor = plan.iconTint
        iconWell.addSubview(icon)
        NSLayoutConstraint.activate([
            icon.centerXAnchor.constraint(equalTo: iconWell.centerXAnchor),
            icon.centerYAnchor.constraint(equalTo: iconWell.centerYAnchor)
        ])

        let titleLabel = NSTextField(labelWithString: plan.title)
        titleLabel.font = .systemFont(ofSize: 20, weight: .semibold)
        titleLabel.textColor = Theme.primaryText
        titleLabel.alignment = .center

        let subtitleLabel = NSTextField(labelWithString: plan.subtitle)
        subtitleLabel.font = .systemFont(ofSize: 12, weight: .regular)
        subtitleLabel.textColor = Theme.secondaryText
        subtitleLabel.alignment = .center

        let topRightTag = pillLabel(text: plan.billedPill, tint: Theme.bottomStrip, textColor: Theme.iconTint)
        topRightTag.isHidden = plan.billedPill.isEmpty
        topRightTag.font = .systemFont(ofSize: 10, weight: .bold)

        let priceLabel = NSTextField(labelWithString: Self.unloadedPricePlaceholder)
        priceLabel.font = .systemFont(ofSize: 18, weight: .semibold)
        priceLabel.textColor = Theme.primaryText

        let periodLabel = NSTextField(labelWithString: plan.period)
        periodLabel.font = .systemFont(ofSize: 13, weight: .medium)
        periodLabel.textColor = Theme.secondaryText

        let priceRow = NSStackView(views: [priceLabel, periodLabel])
        priceRow.orientation = .horizontal
        priceRow.spacing = 4
        priceRow.alignment = .firstBaseline

        let billingLabel = NSTextField(labelWithString: plan.billedLine)
        billingLabel.font = .systemFont(ofSize: 13, weight: .medium)
        billingLabel.textColor = Theme.secondaryText

        let inlinePriceInfo = inlinePriceInfoLabel(oldPrice: plan.crossedPrice, newPrice: plan.savingsText)

        let divider = NSBox()
        divider.boxType = .separator
        divider.translatesAutoresizingMaskIntoConstraints = false
        divider.borderColor = Theme.divider

        let featuresStack = NSStackView(views: plan.features.map(makeFeatureRow(_:)))
        featuresStack.orientation = .vertical
        featuresStack.spacing = FeatureListMetrics.spacing
        featuresStack.alignment = .leading
        featuresStack.edgeInsets = FeatureListMetrics.edgeInsets

        let selectButton = PlanPurchaseHoverButton(
            planId: plan.id,
            title: "Get \(plan.title)",
            isPrimaryStyle: plan.highlight,
            target: self,
            action: #selector(didTapSelectPlan)
        )
        planPurchaseButtons[plan.id] = selectButton
        planPriceFields[plan.id] = (priceLabel, periodLabel)
        selectButton.heightAnchor.constraint(equalToConstant: 50).isActive = true

        var contentViews: [NSView] = [iconWell, titleLabel, subtitleLabel, priceRow]
        if !plan.billedLine.isEmpty {
            contentViews.append(billingLabel)
        }
        if plan.crossedPrice != nil, plan.savingsText != nil {
            contentViews.append(inlinePriceInfo)
        }
        contentViews.append(contentsOf: [divider, featuresStack])

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

        let column = NSStackView(views: contentViews + [verticalFlex, selectButton])
        column.orientation = .vertical
        column.spacing = 10
        column.alignment = .centerX
        column.distribution = .fill
        column.translatesAutoresizingMaskIntoConstraints = false
        card.addSubview(column)
        card.addSubview(topRightTag)

        NSLayoutConstraint.activate([
            divider.widthAnchor.constraint(equalTo: column.widthAnchor),
            featuresStack.widthAnchor.constraint(equalTo: column.widthAnchor),
            column.leadingAnchor.constraint(equalTo: card.leadingAnchor, constant: 18),
            column.trailingAnchor.constraint(equalTo: card.trailingAnchor, constant: -18),
            column.topAnchor.constraint(equalTo: card.topAnchor, constant: 14),
            column.bottomAnchor.constraint(equalTo: card.bottomAnchor, constant: -12),
            selectButton.widthAnchor.constraint(equalTo: column.widthAnchor),
            topRightTag.topAnchor.constraint(equalTo: card.topAnchor, constant: 12),
            topRightTag.trailingAnchor.constraint(equalTo: card.trailingAnchor, constant: -12)
        ])

        return card
    }

    private func makeFeatureRow(_ text: String) -> NSView {
        let icon = NSImageView()
        icon.translatesAutoresizingMaskIntoConstraints = false
        icon.symbolConfiguration = NSImage.SymbolConfiguration(pointSize: 11, weight: .bold)
        icon.image = NSImage(systemSymbolName: "checkmark.circle.fill", accessibilityDescription: nil)
        icon.contentTintColor = Theme.iconTint
        icon.widthAnchor.constraint(equalToConstant: 14).isActive = true

        let label = NSTextField(labelWithString: text)
        label.font = .systemFont(ofSize: 14, weight: .medium)
        label.textColor = Theme.primaryText

        let row = NSStackView(views: [icon, label])
        row.orientation = .horizontal
        row.spacing = FeatureListMetrics.spacing
        row.alignment = .centerY
        row.distribution = .fill
        return row
    }

    private func inlinePriceInfoLabel(oldPrice: String?, newPrice: String?) -> NSTextField {
        guard let oldPrice, let newPrice else {
            return NSTextField(labelWithString: "")
        }
        let full = NSMutableAttributedString()
        let oldAttributes: [NSAttributedString.Key: Any] = [
            .font: NSFont.systemFont(ofSize: 12, weight: .semibold),
            .foregroundColor: Theme.secondaryText,
            .strikethroughStyle: NSUnderlineStyle.single.rawValue
        ]
        let newAttributes: [NSAttributedString.Key: Any] = [
            .font: NSFont.systemFont(ofSize: 12, weight: .bold),
            .foregroundColor: Theme.successText
        ]
        full.append(NSAttributedString(string: "\(oldPrice)  ", attributes: oldAttributes))
        full.append(NSAttributedString(string: newPrice, attributes: newAttributes))
        let label = NSTextField(labelWithAttributedString: full)
        return label
    }

    private func pillLabel(text: String, tint: NSColor, textColor: NSColor) -> NSTextField {
        let pill = NSTextField(labelWithString: text)
        pill.font = .systemFont(ofSize: 10, weight: .semibold)
        pill.textColor = textColor
        pill.alignment = .center
        pill.wantsLayer = true
        pill.layer?.backgroundColor = tint.cgColor
        pill.layer?.cornerRadius = 9
        pill.translatesAutoresizingMaskIntoConstraints = false
        pill.heightAnchor.constraint(equalToConstant: 18).isActive = true
        pill.widthAnchor.constraint(greaterThanOrEqualToConstant: 95).isActive = true
        return pill
    }

    private func makeTrustRow() -> NSView {
        let badges = NSStackView(views: [
            trustBadge(icon: "shield.fill", title: "Secure Payments", subtitle: "Your payment is 100% secure."),
            trustBadge(icon: "arrow.counterclockwise", title: "Cancel Anytime", subtitle: "No commitment, cancel anytime."),
            trustBadge(icon: "headphones", title: "24/7 Support", subtitle: "We're here to help you anytime."),
            trustBadge(icon: "lock.fill", title: "Privacy First", subtitle: "Your data is safe with us.")
        ])
        badges.orientation = .horizontal
        badges.alignment = .centerY
        badges.distribution = .fillEqually
        badges.spacing = 12
        badges.edgeInsets = NSEdgeInsets(top: 0, left: 8, bottom: 0, right: 8)
        badges.translatesAutoresizingMaskIntoConstraints = false
        badges.wantsLayer = true
        badges.layer?.backgroundColor = Theme.bottomStrip.cgColor
        badges.layer?.borderColor = Theme.divider.cgColor
        badges.layer?.borderWidth = 1
        badges.layer?.cornerRadius = 10
        badges.setHuggingPriority(.defaultLow, for: .horizontal)
        badges.heightAnchor.constraint(equalToConstant: 72).isActive = true
        return badges
    }

    private func makeFooterRow() -> NSView {
        let primary = footerActionCell(
            title: subscriptionPrimaryFooterTitle(),
            action: #selector(didTapPrimaryFooterSubscriptionAction),
            showsTrailingDivider: true
        )
        subscriptionPrimaryFooterButton = primary.button

        let entries: [(text: String, action: Selector)] = [
            ("Restore Purchase", #selector(didTapRestorePurchases)),
            ("Privacy Policy", #selector(didTapFooterPrivacyPolicy)),
            ("Terms of Use", #selector(didTapFooterTermsOfServices)),
            ("Support", #selector(didTapFooterSupport))
        ]

        let cells = [primary.container] + entries.enumerated().map { index, entry in
            footerActionCell(title: entry.text, action: entry.action, showsTrailingDivider: index < entries.count - 1).container
        }

        let links = NSStackView(views: cells)
        links.orientation = .horizontal
        links.distribution = .fillEqually
        links.spacing = 0
        links.alignment = .centerY
        links.translatesAutoresizingMaskIntoConstraints = false
        return links
    }

    private func footerActionCell(title: String, action: Selector, showsTrailingDivider: Bool) -> (container: NSView, button: NSButton) {
        let container = NSView()
        container.translatesAutoresizingMaskIntoConstraints = false

        let button = FooterLinkButton(title: title, target: self, action: action)
        button.isBordered = false
        button.bezelStyle = .rounded
        button.font = .systemFont(ofSize: 12, weight: .medium)
        button.contentTintColor = Theme.secondaryText
        button.focusRingType = .none
        button.translatesAutoresizingMaskIntoConstraints = false
        container.addSubview(button)

        var constraints: [NSLayoutConstraint] = [
            button.centerXAnchor.constraint(equalTo: container.centerXAnchor),
            button.centerYAnchor.constraint(equalTo: container.centerYAnchor)
        ]

        if showsTrailingDivider {
            let divider = footerDivider()
            container.addSubview(divider)
            constraints.append(contentsOf: [
                divider.trailingAnchor.constraint(equalTo: container.trailingAnchor),
                divider.centerYAnchor.constraint(equalTo: container.centerYAnchor)
            ])
        }

        NSLayoutConstraint.activate(constraints)
        return (container, button)
    }

    private enum PrimaryFooterSubscriptionTitle {
        static let manage = "Manage Subscription"
        static let continueFree = "Continue with free plan"
    }

    private func subscriptionPrimaryFooterTitle() -> String {
        subscriptionStore.isProActive ? PrimaryFooterSubscriptionTitle.manage : PrimaryFooterSubscriptionTitle.continueFree
    }

    private func updateSubscriptionPrimaryFooter() {
        subscriptionPrimaryFooterButton?.title = subscriptionPrimaryFooterTitle()
    }

    private func trustBadge(icon: String, title: String, subtitle: String) -> NSView {
        let image = NSImageView()
        image.translatesAutoresizingMaskIntoConstraints = false
        image.symbolConfiguration = NSImage.SymbolConfiguration(pointSize: 12, weight: .semibold)
        image.image = NSImage(systemSymbolName: icon, accessibilityDescription: nil)
        image.contentTintColor = Theme.primaryText

        let titleLabel = NSTextField(labelWithString: title)
        titleLabel.font = .systemFont(ofSize: 12, weight: .bold)
        titleLabel.textColor = Theme.primaryText
        let subtitleLabel = NSTextField(labelWithString: subtitle)
        subtitleLabel.font = .systemFont(ofSize: 10, weight: .medium)
        subtitleLabel.textColor = Theme.secondaryText

        let textStack = NSStackView(views: [titleLabel, subtitleLabel])
        textStack.orientation = .vertical
        textStack.spacing = 2
        textStack.alignment = .leading

        let stack = NSStackView(views: [image, textStack])
        stack.orientation = .horizontal
        stack.spacing = 8
        stack.alignment = .leading
        stack.edgeInsets = NSEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
        stack.wantsLayer = true
        stack.layer?.backgroundColor = NSColor.clear.cgColor
        return stack
    }

    private func footerDivider() -> NSBox {
        let divider = NSBox()
        divider.boxType = .separator
        divider.borderColor = Theme.divider
        divider.translatesAutoresizingMaskIntoConstraints = false
        divider.widthAnchor.constraint(equalToConstant: 1).isActive = true
        divider.heightAnchor.constraint(equalToConstant: 14).isActive = true
        return divider
    }

    @objc private func didTapSelectPlan(_ sender: NSButton) {
        guard let planKey = sender.identifier?.rawValue else { return }
        Task { await purchasePlan(planKey: planKey) }
    }

    @objc private func didTapPrimaryFooterSubscriptionAction(_ sender: NSButton) {
        let userTappedManage = (sender.title == PrimaryFooterSubscriptionTitle.manage)
        Task { @MainActor [weak self] in
            guard let self else { return }
            await subscriptionStore.refreshEntitlements(deep: true)
            updateSubscriptionPrimaryFooter()
            let active = subscriptionStore.isProActive
            if active || userTappedManage {
                guard let url = URL(string: "https://apps.apple.com/account/subscriptions") else { return }
                NSWorkspace.shared.open(url)
                return
            }
            // Non-pro: dismiss paywall and return to the home (dashboard) window.
            dismissPremiumSheetFromParentIfNeeded()
        }
    }

    @objc private func didTapRestorePurchases() {
        Task { await restorePurchases() }
    }

    @objc private func didTapFooterPrivacyPolicy() {
        AppLegalURLs.openInSafari(AppLegalURLs.privacyPolicy)
    }

    @objc private func didTapFooterTermsOfServices() {
        AppLegalURLs.openInSafari(AppLegalURLs.termsOfUse)
    }

    @objc private func didTapFooterSupport() {
        AppLegalURLs.openInSafari(AppLegalURLs.support)
    }

    private func loadStoreProducts() async {
        await subscriptionStore.refreshEntitlements(deep: true)
        await subscriptionStore.loadProducts()
        applyStorePricing()
        updateSubscriptionPrimaryFooter()
        updatePremiumCloseButtonVisibility()
    }

    private func applyStorePricing() {
        for plan in plans {
            guard let fields = planPriceFields[plan.id] else { continue }
            guard let product = subscriptionStore.product(forPlanKey: plan.id) else {
                fields.price.stringValue = Self.unloadedPricePlaceholder
                continue
            }
            fields.price.stringValue = product.displayPrice
            if let period = product.subscription?.subscriptionPeriod {
                fields.period.stringValue = periodSuffix(for: period)
            }
        }
    }

    private func periodSuffix(for period: Product.SubscriptionPeriod) -> String {
        let value = period.value
        switch period.unit {
        case .day: return value == 1 ? "/ day" : "/ \(value) days"
        case .week: return value == 1 ? "/ week" : "/ \(value) weeks"
        case .month: return value == 1 ? "/ month" : "/ \(value) months"
        case .year: return value == 1 ? "/ year" : "/ \(value) years"
        @unknown default: return ""
        }
    }

    private func setPurchasing(_ isPurchasing: Bool) {
        for button in planPurchaseButtons.values {
            button.isEnabled = !isPurchasing
        }
    }

    private func purchasePlan(planKey: String) async {
        setPurchasing(true)
        defer { setPurchasing(false) }
        do {
            let completed = try await subscriptionStore.purchase(planKey: planKey)
            guard completed else { return }
            AppRatingCoordinator.shared.scheduleReviewAfterSubscriptionPurchase()
            let alert = NSAlert()
            alert.messageText = "You're subscribed"
            alert.informativeText = "Thank you — Pro features are now available."
            alert.alertStyle = .informational
            alert.addButton(withTitle: "OK")
            if let window = view.window {
                alert.beginSheetModal(for: window) { [weak self] _ in
                    self?.dismissPremiumSheetFromParentIfNeeded()
                }
            } else {
                alert.runModal()
                dismissPremiumSheetFromParentIfNeeded()
            }
        } catch {
            await MainActor.run {
                self.presentPurchaseError(error)
            }
        }
    }

    private func restorePurchases() async {
        setPurchasing(true)
        defer { setPurchasing(false) }
        do {
            try await subscriptionStore.restorePurchases()
            let active = subscriptionStore.isProActive
            let alert = NSAlert()
            if active {
                alert.messageText = "Purchases restored"
                alert.informativeText = "Your subscription is active."
            } else {
                alert.messageText = "No subscription found"
                alert.informativeText = "There was nothing to restore for this Apple ID."
            }
            alert.alertStyle = .informational
            alert.addButton(withTitle: "OK")
            if let window = view.window {
                alert.beginSheetModal(for: window) { [weak self] _ in
                    if active {
                        self?.dismissPremiumSheetFromParentIfNeeded()
                    }
                }
            } else {
                alert.runModal()
                if active {
                    dismissPremiumSheetFromParentIfNeeded()
                }
            }
        } catch {
            await MainActor.run {
                self.presentPurchaseError(error)
            }
        }
    }

    private func presentPurchaseError(_ error: Error) {
        let alert = NSAlert()
        alert.messageText = "Something went wrong"
        if let localized = error as? LocalizedError {
            var parts: [String] = []
            if let description = localized.errorDescription {
                parts.append(description)
            }
            if let recovery = localized.recoverySuggestion {
                parts.append(recovery)
            }
            alert.informativeText = parts.isEmpty ? error.localizedDescription : parts.joined(separator: "\n\n")
        } else {
            alert.informativeText = error.localizedDescription
        }
        alert.alertStyle = .warning
        alert.addButton(withTitle: "OK")
        if let window = view.window {
            alert.beginSheetModal(for: window)
        } else {
            alert.runModal()
        }
    }

    private func dismissPremiumSheetFromParentIfNeeded() {
        guard let sheet = view.window, let parent = sheet.sheetParent else { return }
        parent.endSheet(sheet)
    }

    @objc private func didTapClose() {
        guard let window = view.window else { return }
        if let parent = window.sheetParent {
            parent.endSheet(window)
            return
        }
        window.close()
    }
}