import Foundation
import Postbox
import SwiftSignalKit
import TelegramApi

public enum ServerProvidedSuggestion: Equatable {
    case autoarchivePopular
    case newcomerTicks
    case validatePhoneNumber
    case validatePassword
    case setupPassword
    case upgradePremium
    case annualPremium
    case restorePremium
    case xmasPremiumGift
    case setupBirthday
    case todayBirthdays
    case gracePremium
    case starsSubscriptionLowBalance
    case setupPhoto
    case setupLoginEmail
    case setupLoginEmailBlocking
    case link(id: String, url: String, title: ServerSuggestionInfo.Item.Text, subtitle: ServerSuggestionInfo.Item.Text)
    
    init?(string: String) {
        switch string {
        case "AUTOARCHIVE_POPULAR":
            self = .autoarchivePopular
        case "NEWCOMER_TICKS":
            self = .newcomerTicks
        case "VALIDATE_PHONE_NUMBER":
            self = .validatePhoneNumber
        case "VALIDATE_PASSWORD":
            self = .validatePassword
        case "SETUP_PASSWORD":
            self = .setupPassword
        case "PREMIUM_UPGRADE":
            self = .upgradePremium
        case "PREMIUM_ANNUAL":
            self = .annualPremium
        case "PREMIUM_RESTORE":
            self = .restorePremium
        case "PREMIUM_CHRISTMAS":
            self = .xmasPremiumGift
        case "BIRTHDAY_SETUP":
            self = .setupBirthday
        case "BIRTHDAY_CONTACTS_TODAY":
            self = .todayBirthdays
        case "PREMIUM_GRACE":
            self = .gracePremium
        case "STARS_SUBSCRIPTION_LOW_BALANCE":
            self = .starsSubscriptionLowBalance
        case "USERPIC_SETUP":
            self = .setupPhoto
        case "SETUP_LOGIN_EMAIL":
            self = .setupLoginEmail
        case "SETUP_LOGIN_EMAIL_NOSKIP":
            self = .setupLoginEmailBlocking
        default:
            return nil
        }
    }

    public var id: String {
        switch self {
        case .autoarchivePopular:
            return "AUTOARCHIVE_POPULAR"
        case .newcomerTicks:
            return "NEWCOMER_TICKS"
        case .validatePhoneNumber:
            return "VALIDATE_PHONE_NUMBER"
        case .validatePassword:
            return "VALIDATE_PASSWORD"
        case .setupPassword:
            return "SETUP_PASSWORD"
        case .upgradePremium:
            return "PREMIUM_UPGRADE"
        case .annualPremium:
            return "PREMIUM_ANNUAL"
        case .restorePremium:
            return "PREMIUM_RESTORE"
        case .xmasPremiumGift:
            return "PREMIUM_CHRISTMAS"
        case .setupBirthday:
            return "BIRTHDAY_SETUP"
        case .todayBirthdays:
            return "BIRTHDAY_CONTACTS_TODAY"
        case .gracePremium:
            return "PREMIUM_GRACE"
        case .starsSubscriptionLowBalance:
            return "STARS_SUBSCRIPTION_LOW_BALANCE"
        case .setupPhoto:
            return "USERPIC_SETUP"
        case .setupLoginEmail:
            return "SETUP_LOGIN_EMAIL"
        case .setupLoginEmailBlocking:
            return "SETUP_LOGIN_EMAIL_NOSKIP"
        case let .link(id, _, _, _):
            return id
        }
    }
}

private var dismissedSuggestionsPromise = ValuePromise<[AccountRecordId: Set<String>]>([:])
private var dismissedSuggestions: [AccountRecordId: Set<String>] = [:] {
    didSet {
        dismissedSuggestionsPromise.set(dismissedSuggestions)
    }
}

func _internal_getServerProvidedSuggestions(account: Account) -> Signal<[ServerProvidedSuggestion], NoError> {
    let key: PostboxViewKey = .preferences(keys: Set([PreferencesKeys.serverSuggestionInfo()]))
    return combineLatest(account.postbox.combinedView(keys: [key]), dismissedSuggestionsPromise.get())
    |> map { views, dismissedSuggestionsValue -> [ServerProvidedSuggestion] in
        let dismissedSuggestions = dismissedSuggestionsValue[account.id] ?? Set()
        guard let view = views.views[key] as? PreferencesView else {
            return []
        }
        guard let serverSuggestionInfo = view.values[PreferencesKeys.serverSuggestionInfo()]?.get(ServerSuggestionInfo.self) else {
            return []
        }
        
        var items: [ServerProvidedSuggestion] = []
        for item in serverSuggestionInfo.legacyItems {
            if let value = ServerProvidedSuggestion(string: item) {
                items.append(value)
            }
        }
        for item in serverSuggestionInfo.items {
            switch item.action {
            case let .link(url):
                items.append(.link(
                    id: item.id,
                    url: url,
                    title: item.title,
                    subtitle: item.text
                ))
            }
        }
        
        return items.filter({ !dismissedSuggestions.contains($0.id) })
    }
    |> distinctUntilChanged
}

func _internal_getServerDismissedSuggestions(account: Account) -> Signal<[String], NoError> {
    let key: PostboxViewKey = .preferences(keys: Set([PreferencesKeys.serverSuggestionInfo()]))
    return combineLatest(account.postbox.combinedView(keys: [key]), dismissedSuggestionsPromise.get())
    |> map { views, dismissedSuggestionsValue -> [String] in
        let dismissedSuggestions = dismissedSuggestionsValue[account.id] ?? Set()
        guard let view = views.views[key] as? PreferencesView else {
            return []
        }
        guard let serverSuggestionInfo = view.values[PreferencesKeys.serverSuggestionInfo()]?.get(ServerSuggestionInfo.self) else {
            return []
        }
        var items: [String] = serverSuggestionInfo.dismissedIds
        items.append(contentsOf: dismissedSuggestions)
        return items
    }
    |> distinctUntilChanged
}

func _internal_dismissServerProvidedSuggestion(account: Account, suggestion: String) -> Signal<Never, NoError> {
    if let _ = dismissedSuggestions[account.id] {
        dismissedSuggestions[account.id]?.insert(suggestion)
    } else {
        dismissedSuggestions[account.id] = Set([suggestion])
    }
    if suggestion == ServerProvidedSuggestion.setupLoginEmailBlocking.id {
        return .complete()
    }
    return account.network.request(Api.functions.help.dismissSuggestion(peer: .inputPeerEmpty, suggestion: suggestion))
    |> `catch` { _ -> Signal<Api.Bool, NoError> in
        return .single(.boolFalse)
    }
    |> ignoreValues
}


public enum PeerSpecificServerProvidedSuggestion: String {
    case convertToGigagroup = "CONVERT_GIGAGROUP"
}

func _internal_getPeerSpecificServerProvidedSuggestions(postbox: Postbox, peerId: PeerId) -> Signal<[PeerSpecificServerProvidedSuggestion], NoError> {
    return postbox.peerView(id: peerId)
    |> map { view in
        if let cachedData = view.cachedData as? CachedChannelData {
            return cachedData.pendingSuggestions.compactMap { item -> PeerSpecificServerProvidedSuggestion? in
                return PeerSpecificServerProvidedSuggestion(rawValue: item)
            }
        }
        return []
    }
    |> distinctUntilChanged
}

func _internal_dismissPeerSpecificServerProvidedSuggestion(account: Account, peerId: PeerId, suggestion: PeerSpecificServerProvidedSuggestion) -> Signal<Never, NoError> {
    return account.postbox.loadedPeerWithId(peerId)
    |> mapToSignal { peer -> Signal<Never, NoError> in
        guard let inputPeer = apiInputPeer(peer) else {
            return .never()
        }
        return account.network.request(Api.functions.help.dismissSuggestion(peer: inputPeer, suggestion: suggestion.rawValue))
        |> `catch` { _ -> Signal<Api.Bool, NoError> in
            return .single(.boolFalse)
        }
        |> mapToSignal { a -> Signal<Never, NoError> in
            return account.postbox.transaction { transaction in
                transaction.updatePeerCachedData(peerIds: [peerId]) { (_, current) -> CachedPeerData? in
                    var updated = current
                    if let cachedData = current as? CachedChannelData {
                        var pendingSuggestions = cachedData.pendingSuggestions
                        pendingSuggestions.removeAll(where: { $0 == suggestion.rawValue })
                        updated = cachedData.withUpdatedPendingSuggestions(pendingSuggestions)
                    }
                    return updated
                }
            } |> ignoreValues
        }
    }
}