Swiftgram/submodules/PremiumUI/Sources/PremiumIntroScreen.swift

import Foundation
import UIKit
import Display
import ComponentFlow
import SwiftSignalKit
import TelegramCore
import TelegramPresentationData
import PresentationDataUtils
import ViewControllerComponent
import AccountContext
import SolidRoundedButtonComponent
import MultilineTextComponent
import PrefixSectionGroupComponent
import BundleIconComponent
import SolidRoundedButtonComponent
import Markdown
import InAppPurchaseManager
import ConfettiEffect
import TextFormat
import InstantPageCache

public enum PremiumSource {
    case settings
    case stickers
    case reactions
    case ads
    case upload
    case groupsAndChannels
    case pinnedChats
    case publicLinks
    case savedGifs
    case savedStickers
    case folders
    case chatsPerFolder
    case accounts
    
    var identifier: String {
        switch self {
            case .settings:
                return "settings"
            case .stickers:
                return "premium_stickers"
            case .reactions:
                return "unique_reactions"
            case .ads:
                return "no_ads"
            case .upload:
                return "more_upload"
            case .groupsAndChannels:
                return "double_limits__channels"
            case .pinnedChats:
                return "double_limits__dialog_pinned"
            case .publicLinks:
                return "double_limits__channels_public"
            case .savedGifs:
                return "double_limits__saved_gifs"
            case .savedStickers:
                return "double_limits__stickers_faved"
            case .folders:
                return "double_limits__dialog_filters"
            case .chatsPerFolder:
                return "double_limits__dialog_filters_chats"
            case .accounts:
                return "double_limits__accounts"
        }
    }
}

private enum PremiumPerk: CaseIterable {
    case doubleLimits
    case moreUpload
    case fasterDownload
    case voiceToText
    case noAds
    case uniqueReactions
    case premiumStickers
    case advancedChatManagement
    case profileBadge
    case animatedUserpics
    
    static var allCases: [PremiumPerk] {
        return [
            .doubleLimits,
            .moreUpload,
            .fasterDownload,
            .voiceToText,
            .noAds,
            .uniqueReactions,
            .premiumStickers,
            .advancedChatManagement,
            .profileBadge,
            .animatedUserpics
        ]
    }
    
    init?(identifier: String) {
        for perk in PremiumPerk.allCases {
            if perk.identifier == identifier {
                self = perk
                return
            }
        }
        return nil
    }
    
    var identifier: String {
        switch self {
            case .doubleLimits:
                return "double_limits"
            case .moreUpload:
                return "more_upload"
            case .fasterDownload:
                return "faster_download"
            case .voiceToText:
                return "voice_to_text"
            case .noAds:
                return "no_ads"
            case .uniqueReactions:
                return "unique_reactions"
            case .premiumStickers:
                return "premium_stickers"
            case .advancedChatManagement:
                return "advanced_chat_management"
            case .profileBadge:
                return "profile_badge"
            case .animatedUserpics:
                return "animated_userpics"
        }
    }
    
    func title(strings: PresentationStrings) -> String {
        switch self {
            case .doubleLimits:
                return strings.Premium_DoubledLimits
            case .moreUpload:
                return strings.Premium_UploadSize
            case .fasterDownload:
                return strings.Premium_FasterSpeed
            case .voiceToText:
                return strings.Premium_VoiceToText
            case .noAds:
                return strings.Premium_NoAds
            case .uniqueReactions:
                return strings.Premium_Reactions
            case .premiumStickers:
                return strings.Premium_Stickers
            case .advancedChatManagement:
                return strings.Premium_ChatManagement
            case .profileBadge:
                return strings.Premium_Badge
            case .animatedUserpics:
                return strings.Premium_Avatar
        }
    }
    
    func subtitle(strings: PresentationStrings) -> String {
        switch self {
            case .doubleLimits:
                return strings.Premium_DoubledLimitsInfo
            case .moreUpload:
                return strings.Premium_UploadSizeInfo
            case .fasterDownload:
                return strings.Premium_FasterSpeedInfo
            case .voiceToText:
                return strings.Premium_VoiceToTextInfo
            case .noAds:
                return strings.Premium_NoAdsInfo
            case .uniqueReactions:
                return strings.Premium_ReactionsInfo
            case .premiumStickers:
                return strings.Premium_StickersInfo
            case .advancedChatManagement:
                return strings.Premium_ChatManagementInfo
            case .profileBadge:
                return strings.Premium_BadgeInfo
            case .animatedUserpics:
                return strings.Premium_AvatarInfo
        }
    }
    
    var iconName: String {
        switch self {
            case .doubleLimits:
                return "Premium/Perk/Limits"
            case .moreUpload:
                return "Premium/Perk/Upload"
            case .fasterDownload:
                return "Premium/Perk/Speed"
            case .voiceToText:
                return "Premium/Perk/Voice"
            case .noAds:
                return "Premium/Perk/NoAds"
            case .uniqueReactions:
                return "Premium/Perk/Reactions"
            case .premiumStickers:
                return "Premium/Perk/Stickers"
            case .advancedChatManagement:
                return "Premium/Perk/Chat"
            case .profileBadge:
                return "Premium/Perk/Badge"
            case .animatedUserpics:
                return "Premium/Perk/Avatar"
        }
    }
}

private struct PremiumIntroConfiguration {
    static var defaultValue: PremiumIntroConfiguration {
        return PremiumIntroConfiguration(perks: [
            .doubleLimits,
            .moreUpload,
            .fasterDownload,
            .voiceToText,
            .noAds,
            .uniqueReactions,
            .premiumStickers,
            .advancedChatManagement,
            .profileBadge,
            .animatedUserpics
        ])
    }
    
    let perks: [PremiumPerk]
    
    fileprivate init(perks: [PremiumPerk]) {
        self.perks = perks
    }
    
    public static func with(appConfiguration: AppConfiguration) -> PremiumIntroConfiguration {
        if let data = appConfiguration.data, let values = data["premium_promo_order"] as? [String] {
            var perks: [PremiumPerk] = []
            for value in values {
                if let perk = PremiumPerk(identifier: value) {
                    if !perks.contains(perk) {
                        perks.append(perk)
                    } else {
                        perks = []
                        break
                    }
                } else {
                    perks = []
                    break
                }
            }
            if perks.count < 4 {
                perks = PremiumIntroConfiguration.defaultValue.perks
            }
            return PremiumIntroConfiguration(perks: perks)
        } else {
            return .defaultValue
        }
    }
}

private final class SectionGroupComponent: Component {
    public final class Item: Equatable {
        public let content: AnyComponentWithIdentity<Empty>
        public let action: () -> Void
        
        public init(_ content: AnyComponentWithIdentity<Empty>, action: @escaping () -> Void) {
            self.content = content
            self.action = action
        }
        
        public static func ==(lhs: Item, rhs: Item) -> Bool {
            if lhs.content != rhs.content {
                return false
            }
            
            return true
        }
    }
    
    public let items: [Item]
    public let backgroundColor: UIColor
    public let selectionColor: UIColor
    public let separatorColor: UIColor
    
    public init(
        items: [Item],
        backgroundColor: UIColor,
        selectionColor: UIColor,
        separatorColor: UIColor
    ) {
        self.items = items
        self.backgroundColor = backgroundColor
        self.selectionColor = selectionColor
        self.separatorColor = separatorColor
    }
    
    public static func ==(lhs: SectionGroupComponent, rhs: SectionGroupComponent) -> Bool {
        if lhs.items != rhs.items {
            return false
        }
        if lhs.backgroundColor != rhs.backgroundColor {
            return false
        }
        if lhs.selectionColor != rhs.selectionColor {
            return false
        }
        if lhs.separatorColor != rhs.separatorColor {
            return false
        }
        return true
    }
    
    public final class View: UIView {
        private var buttonViews: [AnyHashable: HighlightTrackingButton] = [:]
        private var itemViews: [AnyHashable: ComponentHostView<Empty>] = [:]
        private var separatorViews: [UIView] = []
        
        private var component: SectionGroupComponent?
        
        override init(frame: CGRect) {
            super.init(frame: frame)
        }
        
        required init?(coder: NSCoder) {
            fatalError("init(coder:) has not been implemented")
        }
        
        @objc private func buttonPressed(_ sender: HighlightTrackingButton) {
            guard let component = self.component else {
                return
            }
            
            if let (id, _) = self.buttonViews.first(where: { $0.value === sender }), let item = component.items.first(where: { $0.content.id == id }) {
                item.action()
            }
        }
        
        func update(component: SectionGroupComponent, availableSize: CGSize, state: EmptyComponentState, environment: Environment<Empty>, transition: Transition) -> CGSize {
            let sideInset: CGFloat = 16.0
            
            self.backgroundColor = component.backgroundColor
            
            var size = CGSize(width: availableSize.width, height: 0.0)
            
            var validIds: [AnyHashable] = []
            
            var i = 0
            for item in component.items {
                validIds.append(item.content.id)
                
                let buttonView: HighlightTrackingButton
                let itemView: ComponentHostView<Empty>
                var itemTransition = transition
                
                if let current = self.buttonViews[item.content.id] {
                    buttonView = current
                } else {
                    buttonView = HighlightTrackingButton()
                    buttonView.addTarget(self, action: #selector(self.buttonPressed(_:)), for: .touchUpInside)
                    self.buttonViews[item.content.id] = buttonView
                    self.addSubview(buttonView)
                }
                
                if let current = self.itemViews[item.content.id] {
                    itemView = current
                } else {
                    itemTransition = transition.withAnimation(.none)
                    itemView = ComponentHostView<Empty>()
                    self.itemViews[item.content.id] = itemView
                    self.addSubview(itemView)
                }
                let itemSize = itemView.update(
                    transition: itemTransition,
                    component: item.content.component,
                    environment: {},
                    containerSize: CGSize(width: size.width - sideInset, height: .greatestFiniteMagnitude)
                )
                
                let itemFrame = CGRect(origin: CGPoint(x: 0.0, y: size.height), size: itemSize)
                buttonView.frame = CGRect(origin: itemFrame.origin, size: CGSize(width: availableSize.width, height: itemSize.height + UIScreenPixel))
                itemView.frame = CGRect(origin: CGPoint(x: itemFrame.minX + sideInset, y: itemFrame.minY + floor((itemFrame.height - itemSize.height) / 2.0)), size: itemSize)
                itemView.isUserInteractionEnabled = false
                
                buttonView.highligthedChanged = { [weak buttonView] highlighted in
                    if highlighted {
                        buttonView?.backgroundColor = component.selectionColor
                    } else {
                        UIView.animate(withDuration: 0.3, animations: {
                            buttonView?.backgroundColor = nil
                        })
                    }
                }
                
                size.height += itemSize.height
                
                if i != component.items.count - 1 {
                    let separatorView: UIView
                    if self.separatorViews.count > i {
                        separatorView = self.separatorViews[i]
                    } else {
                        separatorView = UIView()
                        self.separatorViews.append(separatorView)
                        self.addSubview(separatorView)
                    }
                    separatorView.backgroundColor = component.separatorColor
                    
                    separatorView.frame = CGRect(origin: CGPoint(x: itemFrame.minX + sideInset * 2.0 + 30.0, y: itemFrame.maxY), size: CGSize(width: size.width - sideInset * 2.0 - 30.0, height: UIScreenPixel))
                }
                i += 1
            }
            
            var removeIds: [AnyHashable] = []
            for (id, itemView) in self.itemViews {
                if !validIds.contains(id) {
                    removeIds.append(id)
                    itemView.removeFromSuperview()
                }
            }
            for id in removeIds {
                self.itemViews.removeValue(forKey: id)
            }
            
            if self.separatorViews.count > component.items.count - 1 {
                for i in (component.items.count - 1) ..< self.separatorViews.count {
                    self.separatorViews[i].removeFromSuperview()
                }
                self.separatorViews.removeSubrange((component.items.count - 1) ..< self.separatorViews.count)
            }
            
            self.component = component
            
            return size
        }
    }
    
    public func makeView() -> View {
        return View(frame: CGRect())
    }
    
    public func update(view: View, availableSize: CGSize, state: EmptyComponentState, environment: Environment<Empty>, transition: Transition) -> CGSize {
        return view.update(component: self, availableSize: availableSize, state: state, environment: environment, transition: transition)
    }
}


private final class ScrollChildEnvironment: Equatable {
    public let insets: UIEdgeInsets
    
    public init(insets: UIEdgeInsets) {
        self.insets = insets
    }
    
    public static func ==(lhs: ScrollChildEnvironment, rhs: ScrollChildEnvironment) -> Bool {
        if lhs.insets != rhs.insets {
            return false
        }

        return true
    }
}

private final class ScrollComponent<ChildEnvironment: Equatable>: Component {
    public typealias EnvironmentType = ChildEnvironment
    
    public let content: AnyComponent<(ChildEnvironment, ScrollChildEnvironment)>
    public let contentInsets: UIEdgeInsets
    public let contentOffsetUpdated: (_ top: CGFloat, _ bottom: CGFloat) -> Void
    public let contentOffsetWillCommit: (UnsafeMutablePointer<CGPoint>) -> Void
    
    public init(
        content: AnyComponent<(ChildEnvironment, ScrollChildEnvironment)>,
        contentInsets: UIEdgeInsets,
        contentOffsetUpdated: @escaping (_ top: CGFloat, _ bottom: CGFloat) -> Void,
        contentOffsetWillCommit:  @escaping (UnsafeMutablePointer<CGPoint>) -> Void
    ) {
        self.content = content
        self.contentInsets = contentInsets
        self.contentOffsetUpdated = contentOffsetUpdated
        self.contentOffsetWillCommit = contentOffsetWillCommit
    }
    
    public static func ==(lhs: ScrollComponent, rhs: ScrollComponent) -> Bool {
        if lhs.content != rhs.content {
            return false
        }
        if lhs.contentInsets != rhs.contentInsets {
            return false
        }
        
        return true
    }
    
    public final class View: UIScrollView, UIScrollViewDelegate {
        private var component: ScrollComponent<ChildEnvironment>?
        private let contentView: ComponentHostView<(ChildEnvironment, ScrollChildEnvironment)>
                
        override init(frame: CGRect) {
            self.contentView = ComponentHostView()
            
            super.init(frame: frame)
            
            if #available(iOSApplicationExtension 11.0, iOS 11.0, *) {
                self.contentInsetAdjustmentBehavior = .never
            }
            self.delegate = self
            self.showsVerticalScrollIndicator = false
            self.showsHorizontalScrollIndicator = false
            self.canCancelContentTouches = true
                        
            self.addSubview(self.contentView)
        }
        
        public override func touchesShouldCancel(in view: UIView) -> Bool {
            return true
        }
        
        private var ignoreDidScroll = false
        public func scrollViewDidScroll(_ scrollView: UIScrollView) {
            guard let component = self.component, !self.ignoreDidScroll else {
                return
            }
            let topOffset = scrollView.contentOffset.y
            let bottomOffset = max(0.0, scrollView.contentSize.height - scrollView.contentOffset.y - scrollView.frame.height)
            component.contentOffsetUpdated(topOffset, bottomOffset)
        }
        
        public func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
            guard let component = self.component, !self.ignoreDidScroll else {
                return
            }
            component.contentOffsetWillCommit(targetContentOffset)
        }
        
        required init?(coder: NSCoder) {
            fatalError("init(coder:) has not been implemented")
        }
                
        func update(component: ScrollComponent<ChildEnvironment>, availableSize: CGSize, state: EmptyComponentState, environment: Environment<ChildEnvironment>, transition: Transition) -> CGSize {
            let contentSize = self.contentView.update(
                transition: transition,
                component: component.content,
                environment: {
                    environment[ChildEnvironment.self]
                    ScrollChildEnvironment(insets: component.contentInsets)
                },
                containerSize: CGSize(width: availableSize.width, height: .greatestFiniteMagnitude)
            )
            transition.setFrame(view: self.contentView, frame: CGRect(origin: .zero, size: contentSize), completion: nil)
            
            if self.contentSize != contentSize {
                self.ignoreDidScroll = true
                self.contentSize = contentSize
                self.ignoreDidScroll = false
            }
            if self.scrollIndicatorInsets != component.contentInsets {
                self.scrollIndicatorInsets = component.contentInsets
            }
            
            self.component = component
            
            return availableSize
        }
    }
    
    public func makeView() -> View {
        return View(frame: CGRect())
    }
    
    public func update(view: View, availableSize: CGSize, state: EmptyComponentState, environment: Environment<ChildEnvironment>, transition: Transition) -> CGSize {
        return view.update(component: self, availableSize: availableSize, state: state, environment: environment, transition: transition)
    }
}

final class PerkComponent: CombinedComponent {
    public let iconName: String
    public let iconBackgroundColors: [UIColor]
    public let title: String
    public let titleColor: UIColor
    public let subtitle: String
    public let subtitleColor: UIColor
    public let arrowColor: UIColor
    
    public init(
        iconName: String,
        iconBackgroundColors: [UIColor],
        title: String,
        titleColor: UIColor,
        subtitle: String,
        subtitleColor: UIColor,
        arrowColor: UIColor
    ) {
        self.iconName = iconName
        self.iconBackgroundColors = iconBackgroundColors
        self.title = title
        self.titleColor = titleColor
        self.subtitle = subtitle
        self.subtitleColor = subtitleColor
        self.arrowColor = arrowColor
    }
    
    public static func ==(lhs: PerkComponent, rhs: PerkComponent) -> Bool {
        if lhs.iconName != rhs.iconName {
            return false
        }
        if lhs.iconBackgroundColors != rhs.iconBackgroundColors {
            return false
        }
        if lhs.title != rhs.title {
            return false
        }
        if lhs.titleColor != rhs.titleColor {
            return false
        }
        if lhs.subtitle != rhs.subtitle {
            return false
        }
        if lhs.subtitleColor != rhs.subtitleColor {
            return false
        }
        if lhs.arrowColor != rhs.arrowColor {
            return false
        }
        return true
    }
    
    static var body: Body {
        let iconBackground = Child(RoundedRectangle.self)
        let icon = Child(BundleIconComponent.self)
        let title = Child(Text.self)
        let subtitle = Child(MultilineTextComponent.self)
        let arrow = Child(BundleIconComponent.self)

        return { context in
            let component = context.component
            
            let sideInset: CGFloat = 16.0
            let iconTopInset: CGFloat = 15.0
            let textTopInset: CGFloat = 9.0
            let textBottomInset: CGFloat = 9.0
            let spacing: CGFloat = 3.0
            let iconSize = CGSize(width: 30.0, height: 30.0)
            
            let iconBackground = iconBackground.update(
                component: RoundedRectangle(
                    colors: component.iconBackgroundColors,
                    cornerRadius: 7.0,
                    gradientDirection: .vertical),
                availableSize: iconSize, transition: context.transition
            )
            
            let icon = icon.update(
                component: BundleIconComponent(
                    name: component.iconName,
                    tintColor: .white
                ),
                availableSize: iconSize,
                transition: context.transition
            )
            
            let arrow = arrow.update(
                component: BundleIconComponent(
                    name: "Item List/DisclosureArrow",
                    tintColor: component.arrowColor
                ),
                availableSize: context.availableSize,
                transition: context.transition
            )
            
            let title = title.update(
                component: Text(
                    text: component.title,
                    font: Font.regular(17.0),
                    color: component.titleColor
                ),
                availableSize: CGSize(width: context.availableSize.width - iconBackground.size.width - sideInset * 2.83, height: context.availableSize.height),
                transition: context.transition
            )
            
            let subtitle = subtitle.update(
                component: MultilineTextComponent(
                    text: .plain(
                        NSAttributedString(
                            string: component.subtitle,
                            font: Font.regular(13),
                            textColor: component.subtitleColor
                        )
                    ),
                    maximumNumberOfLines: 0,
                    lineSpacing: 0.1
                ),
                availableSize: CGSize(width: context.availableSize.width - iconBackground.size.width - sideInset * 2.83, height: context.availableSize.height),
                transition: context.transition
            )
            
            let iconPosition = CGPoint(x: iconBackground.size.width / 2.0, y: iconTopInset + iconBackground.size.height / 2.0)
            context.add(iconBackground
                .position(iconPosition)
            )
            
            context.add(icon
                .position(iconPosition)
            )
            
            context.add(title
                .position(CGPoint(x: iconBackground.size.width + sideInset + title.size.width / 2.0, y: textTopInset + title.size.height / 2.0))
            )
            
            context.add(subtitle
                .position(CGPoint(x: iconBackground.size.width + sideInset + subtitle.size.width / 2.0, y: textTopInset + title.size.height + spacing + subtitle.size.height / 2.0))
            )
            
            let size = CGSize(width: context.availableSize.width, height: textTopInset + title.size.height + spacing + subtitle.size.height + textBottomInset)
            context.add(arrow
                .position(CGPoint(x: context.availableSize.width - 7.0 - arrow.size.width / 2.0, y: size.height / 2.0))
            )
        
            return size
        }
    }
}


private final class PremiumIntroScreenContentComponent: CombinedComponent {
    typealias EnvironmentType = (ViewControllerComponentContainer.Environment, ScrollChildEnvironment)
    
    let context: AccountContext
    
    init(context: AccountContext) {
        self.context = context
    }
    
    static func ==(lhs: PremiumIntroScreenContentComponent, rhs: PremiumIntroScreenContentComponent) -> Bool {
        if lhs.context !== rhs.context {
            return false
        }
    
        return true
    }
    
    final class State: ComponentState {
        private let context: AccountContext
        
        private var disposable: Disposable?
        var configuration = PremiumIntroConfiguration.defaultValue
        
        init(context: AccountContext) {
            self.context = context
            
            super.init()
            
            self.disposable = (context.account.postbox.preferencesView(keys: [PreferencesKeys.appConfiguration])
            |> map { view -> AppConfiguration in
                let appConfiguration: AppConfiguration = view.values[PreferencesKeys.appConfiguration]?.get(AppConfiguration.self) ?? AppConfiguration.defaultValue
                return appConfiguration
            }
            |> take(1)
            |> deliverOnMainQueue).start(next: { [weak self] appConfiguration in
                if let strongSelf = self {
                    strongSelf.configuration = PremiumIntroConfiguration.with(appConfiguration: appConfiguration)
                    strongSelf.updated(transition: .immediate)
                }
            })
        }
        
        deinit {
            self.disposable?.dispose()
        }
    }
    
    func makeState() -> State {
        return State(context: self.context)
    }
    
    static var body: Body {
        let overscroll = Child(Rectangle.self)
        let fade = Child(RoundedRectangle.self)
        let text = Child(MultilineTextComponent.self)
        let section = Child(SectionGroupComponent.self)
        let infoBackground = Child(RoundedRectangle.self)
        let infoTitle = Child(MultilineTextComponent.self)
        let infoText = Child(MultilineTextComponent.self)
        let termsText = Child(MultilineTextComponent.self)
        
        return { context in
            let sideInset: CGFloat = 16.0
            
            let scrollEnvironment = context.environment[ScrollChildEnvironment.self].value
            let environment = context.environment[ViewControllerComponentContainer.Environment.self].value
            let state = context.state
            
            let theme = environment.theme
            let strings = environment.strings
            
            let availableWidth = context.availableSize.width
            let sideInsets = sideInset * 2.0 + environment.safeInsets.left + environment.safeInsets.right
            var size = CGSize(width: context.availableSize.width, height: 0.0)
            
            let overscroll = overscroll.update(
                component: Rectangle(color: theme.list.plainBackgroundColor),
                availableSize: CGSize(width: context.availableSize.width, height: 1000),
                transition: context.transition
            )
            context.add(overscroll
                .position(CGPoint(x: overscroll.size.width / 2.0, y: -overscroll.size.height / 2.0))
            )
            
            let fade = fade.update(
                component: RoundedRectangle(
                    colors: [
                        theme.list.plainBackgroundColor,
                        theme.list.blocksBackgroundColor
                    ],
                    cornerRadius: 0.0,
                    gradientDirection: .vertical
                ),
                availableSize: CGSize(width: availableWidth, height: 300),
                transition: context.transition
            )
            context.add(fade
                .position(CGPoint(x: fade.size.width / 2.0, y: fade.size.height / 2.0))
            )
            
            size.height += 183.0 + 10.0 + environment.navigationHeight - 56.0
            
            let textColor = theme.list.itemPrimaryTextColor
            let titleColor = theme.list.itemPrimaryTextColor
            let subtitleColor = theme.list.itemSecondaryTextColor
            let arrowColor = theme.list.disclosureArrowColor
            
            let textFont = Font.regular(15.0)
            let boldTextFont = Font.semibold(15.0)
            
            let markdownAttributes = MarkdownAttributes(body: MarkdownAttributeSet(font: textFont, textColor: textColor), bold: MarkdownAttributeSet(font: boldTextFont, textColor: textColor), link: MarkdownAttributeSet(font: textFont, textColor: textColor), linkAttribute: { _ in
                return nil
            })
            let text = text.update(
                component: MultilineTextComponent(
                    text: .markdown(
                        text: strings.Premium_Description,
                        attributes: markdownAttributes
                    ),
                    horizontalAlignment: .center,
                    maximumNumberOfLines: 0,
                    lineSpacing: 0.2
                ),
                environment: {},
                availableSize: CGSize(width: availableWidth - sideInsets, height: 240.0),
                transition: context.transition
            )
            context.add(text
                .position(CGPoint(x: size.width / 2.0, y: size.height + text.size.height / 2.0))
            )
            size.height += text.size.height
            size.height += 21.0
            
            let gradientColors: [(UIColor, UIColor)] = [
                (UIColor(rgb: 0xF28528), UIColor(rgb: 0xEF7633)),
                (UIColor(rgb: 0xEA5F43), UIColor(rgb: 0xE7504E)),
                (UIColor(rgb: 0xDE4768), UIColor(rgb: 0xD54D82)),
                (UIColor(rgb: 0xDE4768), UIColor(rgb: 0xD54D82)),
                (UIColor(rgb: 0xC654A8), UIColor(rgb: 0xBE5AC2)),
                (UIColor(rgb: 0xAF62E9), UIColor(rgb: 0xA668FF)),
                (UIColor(rgb: 0x9674FF), UIColor(rgb: 0x8C7DFF)),
                (UIColor(rgb: 0x9674FF), UIColor(rgb: 0x8C7DFF)),
                (UIColor(rgb: 0x7B88FF), UIColor(rgb: 0x7091FF)),
                (UIColor(rgb: 0x609DFF), UIColor(rgb: 0x56A5FF))
            ]
            
            var items: [SectionGroupComponent.Item] = []
            
            var i = 0
            for perk in state.configuration.perks {
                let iconBackgroundColors = gradientColors[i]
                items.append(SectionGroupComponent.Item(
                    AnyComponentWithIdentity(
                        id: perk.identifier,
                        component: AnyComponent(
                            PerkComponent(
                                iconName: perk.iconName,
                                iconBackgroundColors: [
                                    iconBackgroundColors.0,
                                    iconBackgroundColors.1
                                ],
                                title: perk.title(strings: strings),
                                titleColor: titleColor,
                                subtitle: perk.subtitle(strings: strings),
                                subtitleColor: subtitleColor,
                                arrowColor: arrowColor
                            )
                        )
                    ),
                    action: {
                        
                    }
                ))
                i += 1
            }
            
            let section = section.update(
                component: SectionGroupComponent(
                    items: items,
                    backgroundColor: environment.theme.list.itemBlocksBackgroundColor,
                    selectionColor: environment.theme.list.itemHighlightedBackgroundColor,
                    separatorColor: environment.theme.list.itemBlocksSeparatorColor
                ),
                environment: {},
                availableSize: CGSize(width: availableWidth - sideInsets, height: .greatestFiniteMagnitude),
                transition: context.transition
            )
            
//
            
//            let section = section.update(
//                component: SectionGroupComponent(
//                    items: [
//                        SectionGroupComponent.Item(
//                            AnyComponentWithIdentity(
//                                id: "limits",
//                                component: AnyComponent(
//                                    PerkComponent(
//                                        iconName: "Premium/Perk/Limits",
//                                        iconBackgroundColors: [
//                                            UIColor(rgb: 0xF28528),
//                                            UIColor(rgb: 0xEF7633)
//                                        ],
//                                        title: strings.Premium_DoubledLimits,
//                                        titleColor: titleColor,
//                                        subtitle: strings.Premium_DoubledLimitsInfo,
//                                        subtitleColor: subtitleColor,
//                                        arrowColor: arrowColor
//                                    )
//                                )
//                            ),
//                            action: {
//
//                            }
//                        ),
//                        SectionGroupComponent.Item(
//                            AnyComponentWithIdentity(
//                                id: "upload",
//                                component: AnyComponent(
//                                    PerkComponent(
//                                        iconName: "Premium/Perk/Upload",
//                                        iconBackgroundColors: [
//                                            UIColor(rgb: 0xEA5F43),
//                                            UIColor(rgb: 0xE7504E)
//                                        ],
//                                        title: strings.Premium_UploadSize,
//                                        titleColor: titleColor,
//                                        subtitle: strings.Premium_UploadSizeInfo,
//                                        subtitleColor: subtitleColor,
//                                        arrowColor: arrowColor
//                                    )
//                                )
//                            ),
//                            action: {
//
//                            }
//                        ),
//                        SectionGroupComponent.Item(
//                            AnyComponentWithIdentity(
//                                id: "speed",
//                                component: AnyComponent(
//                                    PerkComponent(
//                                        iconName: "Premium/Perk/Speed",
//                                        iconBackgroundColors: [
//                                            UIColor(rgb: 0xDE4768),
//                                            UIColor(rgb: 0xD54D82)
//                                        ],
//                                        title: strings.Premium_FasterSpeed,
//                                        titleColor: titleColor,
//                                        subtitle: strings.Premium_FasterSpeedInfo,
//                                        subtitleColor: subtitleColor,
//                                        arrowColor: arrowColor
//                                    )
//                                )
//                            ),
//                            action: {
//
//                            }
//                        ),
//                        SectionGroupComponent.Item(
//                            AnyComponentWithIdentity(
//                                id: "voice",
//                                component: AnyComponent(
//                                    PerkComponent(
//                                        iconName: "Premium/Perk/Voice",
//                                        iconBackgroundColors: [
//                                            UIColor(rgb: 0xDE4768),
//                                            UIColor(rgb: 0xD54D82)
//                                        ],
//                                        title: strings.Premium_VoiceToText,
//                                        titleColor: titleColor,
//                                        subtitle: strings.Premium_VoiceToTextInfo,
//                                        subtitleColor: subtitleColor,
//                                        arrowColor: arrowColor
//                                    )
//                                )
//                            ),
//                            action: {
//
//                            }
//                        ),
//                        SectionGroupComponent.Item(
//                            AnyComponentWithIdentity(
//                                id: "noAds",
//                                component: AnyComponent(
//                                    PerkComponent(
//                                        iconName: "Premium/Perk/NoAds",
//                                        iconBackgroundColors: [
//                                            UIColor(rgb: 0xC654A8),
//                                            UIColor(rgb: 0xBE5AC2)
//                                        ],
//                                        title: strings.Premium_NoAds,
//                                        titleColor: titleColor,
//                                        subtitle: strings.Premium_NoAdsInfo,
//                                        subtitleColor: subtitleColor,
//                                        arrowColor: arrowColor
//                                    )
//                                )
//                            ),
//                            action: {
//
//                            }
//                        ),
//                        SectionGroupComponent.Item(
//                            AnyComponentWithIdentity(
//                                id: "reactions",
//                                component: AnyComponent(
//                                    PerkComponent(
//                                        iconName: "Premium/Perk/Reactions",
//                                        iconBackgroundColors: [
//                                            UIColor(rgb: 0xAF62E9),
//                                            UIColor(rgb: 0xA668FF)
//                                        ],
//                                        title: strings.Premium_Reactions,
//                                        titleColor: titleColor,
//                                        subtitle: strings.Premium_ReactionsInfo,
//                                        subtitleColor: subtitleColor,
//                                        arrowColor: arrowColor
//                                    )
//                                )
//                            ),
//                            action: {
//
//                            }
//                        ),
//                        SectionGroupComponent.Item(
//                            AnyComponentWithIdentity(
//                                id: "stickers",
//                                component: AnyComponent(
//                                    PerkComponent(
//                                        iconName: "Premium/Perk/Stickers",
//                                        iconBackgroundColors: [
//                                            UIColor(rgb: 0x9674FF),
//                                            UIColor(rgb: 0x8C7DFF)
//                                        ],
//                                        title: strings.Premium_Stickers,
//                                        titleColor: titleColor,
//                                        subtitle: strings.Premium_StickersInfo,
//                                        subtitleColor: subtitleColor,
//                                        arrowColor: arrowColor
//                                    )
//                                )
//                            ),
//                            action: {
//
//                            }
//                        ),
//                        SectionGroupComponent.Item(
//                            AnyComponentWithIdentity(
//                                id: "chat",
//                                component: AnyComponent(
//                                    PerkComponent(
//                                        iconName: "Premium/Perk/Chat",
//                                        iconBackgroundColors: [
//                                            UIColor(rgb: 0x9674FF),
//                                            UIColor(rgb: 0x8C7DFF)
//                                        ],
//                                        title: strings.Premium_ChatManagement,
//                                        titleColor: titleColor,
//                                        subtitle: strings.Premium_ChatManagementInfo,
//                                        subtitleColor: subtitleColor,
//                                        arrowColor: arrowColor
//                                    )
//                                )
//                            ),
//                            action: {
//
//                            }
//                        ),
//                        SectionGroupComponent.Item(
//                            AnyComponentWithIdentity(
//                                id: "badge",
//                                component: AnyComponent(
//                                    PerkComponent(
//                                        iconName: "Premium/Perk/Badge",
//                                        iconBackgroundColors: [
//                                            UIColor(rgb: 0x7B88FF),
//                                            UIColor(rgb: 0x7091FF)
//                                        ],
//                                        title: strings.Premium_Badge,
//                                        titleColor: titleColor,
//                                        subtitle: strings.Premium_BadgeInfo,
//                                        subtitleColor: subtitleColor,
//                                        arrowColor: arrowColor
//                                    )
//                                )
//                            ),
//                            action: {
//
//                            }
//                        ),
//                        SectionGroupComponent.Item(
//                            AnyComponentWithIdentity(
//                                id: "avatar",
//                                component: AnyComponent(
//                                    PerkComponent(
//                                        iconName: "Premium/Perk/Avatar",
//                                        iconBackgroundColors: [
//                                            UIColor(rgb: 0x609DFF),
//                                            UIColor(rgb: 0x56A5FF)
//                                        ],
//                                        title: strings.Premium_Avatar,
//                                        titleColor: titleColor,
//                                        subtitle: strings.Premium_AvatarInfo,
//                                        subtitleColor: subtitleColor,
//                                        arrowColor: arrowColor
//                                    )
//                                )
//                            ),
//                            action: {
//
//                            }
//                        ),
//                    ],
//                    backgroundColor: environment.theme.list.itemBlocksBackgroundColor,
//                    selectionColor: environment.theme.list.itemHighlightedBackgroundColor,
//                    separatorColor: environment.theme.list.itemBlocksSeparatorColor
//                ),
//                environment: {},
//                availableSize: CGSize(width: availableWidth - sideInsets, height: .greatestFiniteMagnitude),
//                transition: context.transition
//            )
            context.add(section
                .position(CGPoint(x: availableWidth / 2.0, y: size.height + section.size.height / 2.0))
                .clipsToBounds(true)
                .cornerRadius(10.0)
            )
            size.height += section.size.height
            size.height += 23.0
            
            let textSideInset: CGFloat = 16.0
            let textPadding: CGFloat = 13.0
            
            let infoTitle = infoTitle.update(
                component: MultilineTextComponent(
                    text: .plain(
                        NSAttributedString(string: strings.Premium_AboutTitle.uppercased(), font: Font.regular(14.0), textColor: environment.theme.list.freeTextColor)
                    ),
                    horizontalAlignment: .natural,
                    maximumNumberOfLines: 0,
                    lineSpacing: 0.2
                ),
                environment: {},
                availableSize: CGSize(width: availableWidth - sideInsets, height: .greatestFiniteMagnitude),
                transition: context.transition
            )
            context.add(infoTitle
                .position(CGPoint(x: sideInset + environment.safeInsets.left + textSideInset + infoTitle.size.width / 2.0, y: size.height + infoTitle.size.height / 2.0))
            )
            size.height += infoTitle.size.height
            size.height += 3.0
            
            let infoText = infoText.update(
                component: MultilineTextComponent(
                    text: .markdown(
                        text: strings.Premium_AboutText,
                        attributes: markdownAttributes
                    ),
                    horizontalAlignment: .natural,
                    maximumNumberOfLines: 0,
                    lineSpacing: 0.2
                ),
                environment: {},
                availableSize: CGSize(width: availableWidth - sideInsets - textSideInset * 2.0, height: .greatestFiniteMagnitude),
                transition: context.transition
            )
            
            let infoBackground = infoBackground.update(
                component: RoundedRectangle(
                    color: environment.theme.list.itemBlocksBackgroundColor,
                    cornerRadius: 10.0
                ),
                environment: {},
                availableSize: CGSize(width: availableWidth - sideInsets, height: infoText.size.height + textPadding * 2.0),
                transition: context.transition
            )
            context.add(infoBackground
                .position(CGPoint(x: size.width / 2.0, y: size.height + infoBackground.size.height / 2.0))
            )
            context.add(infoText
                .position(CGPoint(x: sideInset + environment.safeInsets.left + textSideInset + infoText.size.width / 2.0, y: size.height + textPadding + infoText.size.height / 2.0))
            )
            size.height += infoBackground.size.height
            size.height += 6.0
            
            let termsFont = Font.regular(13.0)
            let termsTextColor = environment.theme.list.freeTextColor
            let termsMarkdownAttributes = MarkdownAttributes(body: MarkdownAttributeSet(font: termsFont, textColor: termsTextColor), bold: MarkdownAttributeSet(font: termsFont, textColor: termsTextColor), link: MarkdownAttributeSet(font: termsFont, textColor: environment.theme.list.itemAccentColor), linkAttribute: { contents in
                return (TelegramTextAttributes.URL, contents)
            })
                                                             
            let termsText = termsText.update(
                component: MultilineTextComponent(
                    text: .markdown(
                        text: strings.Premium_Terms,
                        attributes: termsMarkdownAttributes
                    ),
                    horizontalAlignment: .natural,
                    maximumNumberOfLines: 0,
                    lineSpacing: 0.0,
                    highlightColor: environment.theme.list.itemAccentColor.withAlphaComponent(0.3),
                    highlightAction: { attributes in
                        if let _ = attributes[NSAttributedString.Key(rawValue: TelegramTextAttributes.URL)] {
                            return NSAttributedString.Key(rawValue: TelegramTextAttributes.URL)
                        } else {
                            return nil
                        }
                    },
                    tapAction: { attributes, _ in
                        if let url = attributes[NSAttributedString.Key(rawValue: TelegramTextAttributes.URL)] as? String,
                           let controller = environment.controller() as? PremiumIntroScreen, let navigationController = controller.navigationController as? NavigationController {
                            let context = controller.context
                            let signal: Signal<ResolvedUrl, NoError>?
                            switch url {
                                case "terms":
                                    signal = cachedTermsPage(context: context)
                                case "privacy":
                                    signal = cachedPrivacyPage(context: context)
                                default:
                                    signal = nil
                            }
                            if let signal = signal {
                                let _ = (signal
                                |> deliverOnMainQueue).start(next: { resolvedUrl in
                                    context.sharedContext.openResolvedUrl(resolvedUrl, context: context, urlContext: .generic, navigationController: navigationController, forceExternal: false, openPeer: { peer, navigation in
                                    }, sendFile: nil, sendSticker: nil, requestMessageActionUrlAuth: nil, joinVoiceChat: nil, present: { [weak controller] c, arguments in
                                        controller?.push(c)
                                    }, dismissInput: {}, contentContext: nil)
                                })
                            }
                        }
                    }
                ),
                environment: {},
                availableSize: CGSize(width: availableWidth - sideInsets - textSideInset * 2.0, height: .greatestFiniteMagnitude),
                transition: context.transition
            )
            context.add(termsText
                .position(CGPoint(x: sideInset + environment.safeInsets.left + textSideInset + termsText.size.width / 2.0, y: size.height + termsText.size.height / 2.0))
            )
            size.height += termsText.size.height
            size.height += 10.0
            size.height += scrollEnvironment.insets.bottom
            
            return size
        }
    }
}

private class BlurredRectangle: Component {
    let color: UIColor

    init(color: UIColor) {
        self.color = color
    }

    static func ==(lhs: BlurredRectangle, rhs: BlurredRectangle) -> Bool {
        if !lhs.color.isEqual(rhs.color) {
            return false
        }
        return true
    }

    final class View: UIView {
        private let background: NavigationBackgroundNode

        init() {
            self.background = NavigationBackgroundNode(color: .clear)

            super.init(frame: CGRect())

            self.addSubview(self.background.view)
        }

        required init?(coder aDecoder: NSCoder) {
            preconditionFailure()
        }

        func update(component: BlurredRectangle, availableSize: CGSize, transition: Transition) -> CGSize {
            transition.setFrame(view: self.background.view, frame: CGRect(origin: CGPoint(), size: availableSize))
            self.background.updateColor(color: component.color, transition: .immediate)
            self.background.update(size: availableSize, cornerRadius: 0.0, transition: .immediate)

            return availableSize
        }
    }

    func makeView() -> View {
        return View()
    }

    func update(view: View, availableSize: CGSize, state: EmptyComponentState, environment: Environment<Empty>, transition: Transition) -> CGSize {
        return view.update(component: self, availableSize: availableSize, transition: transition)
    }
}

private final class PremiumIntroScreenComponent: CombinedComponent {
    typealias EnvironmentType = ViewControllerComponentContainer.Environment
    
    let context: AccountContext
    let updateInProgress: (Bool) -> Void
    let completion: () -> Void
    
    init(context: AccountContext, updateInProgress: @escaping (Bool) -> Void, completion: @escaping () -> Void) {
        self.context = context
        self.updateInProgress = updateInProgress
        self.completion = completion
    }
        
    static func ==(lhs: PremiumIntroScreenComponent, rhs: PremiumIntroScreenComponent) -> Bool {
        if lhs.context !== rhs.context {
            return false
        }
        return true
    }
    
    final class State: ComponentState {
        private let context: AccountContext
        private let updateInProgress: (Bool) -> Void
        private let completion: () -> Void
        
        var topContentOffset: CGFloat?
        var bottomContentOffset: CGFloat?
        
        var inProgress = false
        var premiumProduct: InAppPurchaseManager.Product?
        private var disposable: Disposable?
        private var paymentDisposable = MetaDisposable()
        private var activationDisposable = MetaDisposable()
        
        init(context: AccountContext, updateInProgress: @escaping (Bool) -> Void, completion: @escaping () -> Void) {
            self.context = context
            self.updateInProgress = updateInProgress
            self.completion = completion
            
            super.init()
            
            if let inAppPurchaseManager = context.sharedContext.inAppPurchaseManager {
                self.disposable = (inAppPurchaseManager.availableProducts
                |> deliverOnMainQueue).start(next: { [weak self] products in
                    if let strongSelf = self {
                        strongSelf.premiumProduct = products.first
                        strongSelf.updated(transition: .immediate)
                    }
                })
            }
        }
        
        deinit {
            self.disposable?.dispose()
            self.paymentDisposable.dispose()
            self.activationDisposable.dispose()
        }
        
        func buy() {
            guard let inAppPurchaseManager = self.context.sharedContext.inAppPurchaseManager,
                  let premiumProduct = self.premiumProduct, !self.inProgress else {
                return
            }
            
            self.inProgress = true
            self.updateInProgress(true)
            self.updated(transition: .immediate)
            
            self.paymentDisposable.set((inAppPurchaseManager.buyProduct(premiumProduct, account: self.context.account)
            |> deliverOnMainQueue).start(next: { [weak self] status in
                if let strongSelf = self, case let .purchased(transactionId) = status {
                    strongSelf.activationDisposable.set((strongSelf.context.engine.payments.assignAppStoreTransaction(transactionId: transactionId)
                    |> deliverOnMainQueue).start(error: { _ in
                        
                    }, completed: { [weak self] in
                        if let strongSelf = self {
                            strongSelf.completion()
                        }
                    }))
                }
            }, error: { [weak self] _ in
                if let strongSelf = self {
                    strongSelf.inProgress = false
                    strongSelf.updateInProgress(false)
                    strongSelf.updated(transition: .immediate)
                }
            }))
        }
    }
    
    func makeState() -> State {
        return State(context: self.context, updateInProgress: self.updateInProgress, completion: self.completion)
    }
    
    static var body: Body {
        let background = Child(Rectangle.self)
        let scrollContent = Child(ScrollComponent<EnvironmentType>.self)
        let star = Child(PremiumStarComponent.self)
        let topPanel = Child(BlurredRectangle.self)
        let topSeparator = Child(Rectangle.self)
        let title = Child(Text.self)
        let bottomPanel = Child(BlurredRectangle.self)
        let bottomSeparator = Child(Rectangle.self)
        let button = Child(SolidRoundedButtonComponent.self)
        
        return { context in
            let environment = context.environment[EnvironmentType.self].value
            let state = context.state
            
            let background = background.update(component: Rectangle(color: environment.theme.list.blocksBackgroundColor), environment: {}, availableSize: context.availableSize, transition: context.transition)
            
            var starIsVisible = true
            if let topContentOffset = state.topContentOffset, topContentOffset >= 123.0 {
                starIsVisible = false
            }
                
            let star = star.update(
                component: PremiumStarComponent(isVisible: starIsVisible),
                availableSize: CGSize(width: min(390.0, context.availableSize.width), height: 220.0),
                transition: context.transition
            )
            
            let topPanel = topPanel.update(
                component: BlurredRectangle(
                    color: environment.theme.rootController.navigationBar.blurredBackgroundColor
                ),
                availableSize: CGSize(width: context.availableSize.width, height: environment.navigationHeight),
                transition: context.transition
            )
            
            let topSeparator = topSeparator.update(
                component: Rectangle(
                    color: environment.theme.rootController.navigationBar.separatorColor
                ),
                availableSize: CGSize(width: context.availableSize.width, height: UIScreenPixel),
                transition: context.transition
            )
            
            let title = title.update(
                component: Text(
                    text: environment.strings.Premium_Title,
                    font: Font.bold(28.0),
                    color: environment.theme.rootController.navigationBar.primaryTextColor
                ),
                availableSize: context.availableSize,
                transition: context.transition
            )
            
            let sideInset: CGFloat = 16.0
            let button = button.update(
                component: SolidRoundedButtonComponent(
                    title: environment.strings.Premium_SubscribeFor(state.premiumProduct?.price ?? "—").string,
                    theme: SolidRoundedButtonComponent.Theme(
                        backgroundColor: UIColor(rgb: 0x8878ff),
                        backgroundColors: [
                            UIColor(rgb: 0x0077ff),
                            UIColor(rgb: 0x6b93ff),
                            UIColor(rgb: 0x8878ff),
                            UIColor(rgb: 0xe46ace)
                        ],
                        foregroundColor: .white
                    ),
                    height: 50.0,
                    cornerRadius: 10.0,
                    gloss: true,
                    isLoading: state.inProgress,
                    action: {
                        state.buy()
                    }
                ),
                availableSize: CGSize(width: context.availableSize.width - sideInset * 2.0 - environment.safeInsets.left - environment.safeInsets.right, height: 50.0),
                transition: context.transition)
            
            let bottomPanelPadding: CGFloat = 12.0
            let bottomInset: CGFloat = environment.safeInsets.bottom > 0.0 ? environment.safeInsets.bottom + 5.0 : bottomPanelPadding
            let bottomPanel = bottomPanel.update(
                component: BlurredRectangle(
                    color: environment.theme.rootController.tabBar.backgroundColor
                ),
                availableSize: CGSize(width: context.availableSize.width, height: bottomPanelPadding + button.size.height + bottomInset),
                transition: context.transition
            )
            
            let bottomSeparator = bottomSeparator.update(
                component: Rectangle(
                    color: environment.theme.rootController.tabBar.separatorColor
                ),
                availableSize: CGSize(width: context.availableSize.width, height: UIScreenPixel),
                transition: context.transition
            )
            
            let scrollContent = scrollContent.update(
                component: ScrollComponent<EnvironmentType>(
                    content: AnyComponent(PremiumIntroScreenContentComponent(
                        context: context.component.context
                    )),
                    contentInsets: UIEdgeInsets(top: environment.navigationHeight, left: 0.0, bottom: bottomPanel.size.height, right: 0.0),
                    contentOffsetUpdated: { [weak state] topContentOffset, bottomContentOffset in
                        state?.topContentOffset = topContentOffset
                        state?.bottomContentOffset = bottomContentOffset
                        Queue.mainQueue().justDispatch {
                            state?.updated(transition: .immediate)
                        }
                    },
                    contentOffsetWillCommit: { targetContentOffset in
                        if targetContentOffset.pointee.y < 100.0 {
                            targetContentOffset.pointee = CGPoint(x: 0.0, y: 0.0)
                        } else if targetContentOffset.pointee.y < 123.0 {
                            targetContentOffset.pointee = CGPoint(x: 0.0, y: 123.0)
                        }
                    }
                ),
                environment: { environment },
                availableSize: context.availableSize,
                transition: context.transition
            )
            
            let topInset: CGFloat = environment.navigationHeight - 56.0
            
            context.add(background
                .position(CGPoint(x: context.availableSize.width / 2.0, y: context.availableSize.height / 2.0))
            )
            
            context.add(scrollContent
                .position(CGPoint(x: context.availableSize.width / 2.0, y: context.availableSize.height / 2.0))
            )
                        
            let topPanelAlpha: CGFloat
            let titleOffset: CGFloat
            let titleScale: CGFloat
            let titleOffsetDelta = (topInset + 160.0) - (environment.statusBarHeight + (environment.navigationHeight - environment.statusBarHeight) / 2.0)
 
            if let topContentOffset = state.topContentOffset {
                topPanelAlpha = min(20.0, max(0.0, topContentOffset - 95.0)) / 20.0
                let topContentOffset = topContentOffset + max(0.0, min(1.0, topContentOffset / titleOffsetDelta)) * 10.0
                titleOffset = topContentOffset
                let fraction = max(0.0, min(1.0, titleOffset / titleOffsetDelta))
                titleScale = 1.0 - fraction * 0.36
            } else {
                topPanelAlpha = 0.0
                titleScale = 1.0
                titleOffset = 0.0
            }
            
            context.add(star
                .position(CGPoint(x: context.availableSize.width / 2.0, y: topInset + star.size.height / 2.0 - 30.0 - titleOffset * titleScale))
                .scale(titleScale)
            )
            
            context.add(topPanel
                .position(CGPoint(x: context.availableSize.width / 2.0, y: topPanel.size.height / 2.0))
                .opacity(topPanelAlpha)
            )
            context.add(topSeparator
                .position(CGPoint(x: context.availableSize.width / 2.0, y: topPanel.size.height))
                .opacity(topPanelAlpha)
            )
            
            context.add(title
                .position(CGPoint(x: context.availableSize.width / 2.0, y: max(topInset + 160.0 - titleOffset, environment.statusBarHeight + (environment.navigationHeight - environment.statusBarHeight) / 2.0)))
                .scale(titleScale)
            )
            
            let bottomPanelAlpha: CGFloat
            if let bottomContentOffset = state.bottomContentOffset {
                bottomPanelAlpha = min(16.0, bottomContentOffset) / 16.0
            } else {
                bottomPanelAlpha = 1.0
            }
            
            context.add(bottomPanel
                .position(CGPoint(x: context.availableSize.width / 2.0, y: context.availableSize.height - bottomPanel.size.height / 2.0))
                .opacity(bottomPanelAlpha)
            )
            context.add(bottomSeparator
                .position(CGPoint(x: context.availableSize.width / 2.0, y: context.availableSize.height - bottomPanel.size.height))
                .opacity(bottomPanelAlpha)
            )
            context.add(button
                .position(CGPoint(x: context.availableSize.width / 2.0, y: context.availableSize.height - bottomPanel.size.height + bottomPanelPadding + button.size.height / 2.0))
            )
            
            return context.availableSize
        }
    }
}

public final class PremiumIntroScreen: ViewControllerComponentContainer {
    fileprivate let context: AccountContext
    
    private var didSetReady = false
    private let _ready = Promise<Bool>()
    public override var ready: Promise<Bool> {
        return self._ready
    }
    
    public init(context: AccountContext, modal: Bool = true, reference: String? = nil, source: PremiumSource? = nil) {
        self.context = context
            
        var updateInProgressImpl: ((Bool) -> Void)?
        var completionImpl: (() -> Void)?
        super.init(context: context, component: PremiumIntroScreenComponent(
            context: context,
            updateInProgress: { inProgress in
                updateInProgressImpl?(inProgress)
            },
            completion: {
                completionImpl?()
            }
        ), navigationBarAppearance: .transparent)
        
        let presentationData = context.sharedContext.currentPresentationData.with { $0 }
        
        if modal {
            let cancelItem = UIBarButtonItem(title: presentationData.strings.Common_Cancel, style: .plain, target: self, action: #selector(self.cancelPressed))
            self.navigationItem.setLeftBarButton(cancelItem, animated: false)
            self.navigationPresentation = .modal
        } else {
            self.navigationPresentation = .modalInLargeLayout
        }
        
        updateInProgressImpl = { [weak self] inProgress in
            if let strongSelf = self {
                strongSelf.navigationItem.leftBarButtonItem?.isEnabled = !inProgress
                strongSelf.view.disablesInteractiveTransitionGestureRecognizer = inProgress
                strongSelf.view.disablesInteractiveModalDismiss = inProgress
            }
        }
        
        completionImpl = { [weak self] in
            if let strongSelf = self {
                strongSelf.view.addSubview(ConfettiView(frame: strongSelf.view.bounds))
                Queue.mainQueue().after(2.0, {
                    self?.dismiss()
                })
            }
        }
    }
    
    required public init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    @objc private func cancelPressed() {
        self.dismiss()
    }
    
    public override func containerLayoutUpdated(_ layout: ContainerViewLayout, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, transition: transition)
        
        if !self.didSetReady {
            if let view = self.node.hostView.findTaggedView(tag: PremiumStarComponent.View.Tag()) as? PremiumStarComponent.View {
                self.didSetReady = true
                self._ready.set(view.ready)
            }
        }
    }
}