//
// SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
// SPDX-License-Identifier: GPL-3.0-or-later
//

import MapKit
import SwiftyGif

protocol BaseChatTableViewCellDelegate: AnyObject {

    func cellWantsToScroll(to message: NCChatMessage)
    func cellWantsToReply(to message: NCChatMessage)
    func cellDidSelectedReaction(_ reaction: NCChatReaction!, for message: NCChatMessage)

    func cellWants(toDownloadFile fileParameter: NCMessageFileParameter, for message: NCChatMessage)
    func cellHasDownloadedImagePreview(withHeight height: CGFloat, for message: NCChatMessage)

    func cellWants(toOpenLocation geoLocationRichObject: GeoLocationRichObject)

    func cellWants(toPlayAudioFile fileParameter: NCMessageFileParameter)
    func cellWants(toPauseAudioFile fileParameter: NCMessageFileParameter)
    func cellWants(toChangeProgress progress: CGFloat, fromAudioFile fileParameter: NCMessageFileParameter)

    func cellWants(toOpenPoll poll: NCMessageParameter)
}

// Common elements
public let chatMessageCellPreviewCornerRadius = 4.0

// Message cell
public let chatMessageCellIdentifier = "chatMessageCellIdentifier"
public let chatGroupedMessageCellIdentifier = "chatGroupedMessageCellIdentifier"
public let chatReplyMessageCellIdentifier = "chatReplyMessageCellIdentifier"
public let chatMessageCellMinimumHeight = 45.0
public let chatGroupedMessageCellMinimumHeight = 25.0

// File cell
public let fileMessageCellIdentifier = "fileMessageCellIdentifier"
public let fileGroupedMessageCellIdentifier = "fileGroupedMessageCellIdentifier"
public let fileMessageCellMinimumHeight = 50.0
public let fileMessageCellFileMaxPreviewHeight = 120.0
public let fileMessageCellFileMaxPreviewWidth = 230.0
public let fileMessageCellMediaFilePreviewHeight = 230.0
public let fileMessageCellMediaFileMaxPreviewWidth = 230.0
public let fileMessageCellVideoPlayIconSize = 48.0

// Location cell
public let locationMessageCellIdentifier = "locationMessageCellIdentifier"
public let locationGroupedMessageCellIdentifier = "locationGroupedMessageCellIdentifier"
public let locationMessageCellMinimumHeight = 50.0
public let locationMessageCellPreviewHeight = 120.0
public let locationMessageCellPreviewWidth = 240.0

// Voice message cell
public let voiceMessageCellIdentifier = "voiceMessageCellIdentifier"
public let voiceGroupedMessageCellIdentifier = "voiceGroupedMessageCellIdentifier"
public let voiceMessageCellPlayerHeight = 52.0

// Poll cell
public let pollMessageCellIdentifier = "pollMessageCellIdentifier"
public let pollGroupedMessageCellIdentifier = "pollGroupedMessageCellIdentifier"

class BaseChatTableViewCell: UITableViewCell, AudioPlayerViewDelegate, ReactionsViewDelegate {

    public weak var delegate: BaseChatTableViewCellDelegate?

    @IBOutlet weak var avatarButton: AvatarButton!
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var dateLabel: UILabel!
    @IBOutlet weak var statusView: UIStackView!
    @IBOutlet weak var messageBodyView: UIView!

    @IBOutlet weak var headerPart: UIView!
    @IBOutlet weak var quotePart: UIView!
    @IBOutlet weak var reactionPart: UIView!
    @IBOutlet weak var referencePart: UIView!

    public var message: NCChatMessage?
    public var messageId: Int = 0

    internal var quotedMessageView: QuotedMessageView?
    internal var reactionView: ReactionsView?
    internal var referenceView: ReferenceView?

    internal var replyGestureRecognizer: DRCellSlideGestureRecognizer?

    // Message cell
    internal var messageTextView: MessageBodyTextView?

    // File cell
    internal var filePreviewImageView: UIImageView?
    internal var filePreviewImageViewHeightConstraint: NSLayoutConstraint?
    internal var filePreviewImageViewWidthConstraint: NSLayoutConstraint?
    internal var fileActivityIndicator: MDCActivityIndicator?
    internal var filePreviewActivityIndicator: MDCActivityIndicator?
    internal var filePreviewPlayIconImageView: UIImageView?
    internal var fileControllerWrapper: NCChatFileControllerWrapper?

    // Location cell
    internal var locationPreviewImageView: UIImageView?
    internal var locationMapSnapshooter: MKMapSnapshotter?
    internal var locationPreviewImageViewHeightConstraint: NSLayoutConstraint?
    internal var locationPreviewImageViewWidthConstraint: NSLayoutConstraint?

    // Audio cell
    internal var audioPlayerView: AudioPlayerView?

    // Poll cell
    internal var pollMessageView: PollMessageView?

    override func awakeFromNib() {
        super.awakeFromNib()

        self.commonInit()
    }

    func commonInit() {
        self.headerPart.isHidden = false
        self.quotePart.isHidden = true
        self.referencePart.isHidden = true
        self.reactionPart.isHidden = true
    }

    override func prepareForReuse() {
        super.prepareForReuse()

        self.message = nil
        self.avatarButton.cancelCurrentRequest()
        self.avatarButton.setImage(nil, for: .normal)

        self.quotedMessageView?.avatarView.cancelCurrentRequest()
        self.quotedMessageView?.avatarView.image = nil

        self.titleLabel.text = ""
        self.dateLabel.text = ""

        self.headerPart.isHidden = false
        self.quotePart.isHidden = true
        self.referencePart.isHidden = true
        self.reactionPart.isHidden = true

        self.statusView.isHidden = false
        self.statusView.subviews.forEach { $0.removeFromSuperview() }

        self.referenceView?.prepareForReuse()

        self.prepareForReuseMessageCell()
        self.prepareForReuseFileCell()
        self.prepareForReuseLocationCell()
        self.prepareForReuseAudioCell()
        self.prepareForReusePollCell()

        if let replyGestureRecognizer {
            self.removeGestureRecognizer(replyGestureRecognizer)
            self.replyGestureRecognizer = nil
        }
    }

    // swiftlint:disable:next cyclomatic_complexity
    public func setup(for message: NCChatMessage, withLastCommonReadMessage lastCommonRead: Int) {
        self.message = message
        self.messageId = message.messageId

        self.avatarButton.setActorAvatar(forMessage: message)
        self.avatarButton.menu = self.getDeferredUserMenu()
        self.avatarButton.showsMenuAsPrimaryAction = true

        let date = Date(timeIntervalSince1970: TimeInterval(message.timestamp))
        self.dateLabel.text = NCUtils.getTime(fromDate: date)

        let messageActor = message.actor
        let titleLabel = messageActor.attributedDisplayName

        if let lastEditActorDisplayName = message.lastEditActorDisplayName, message.lastEditTimestamp > 0 {
            var editedString = ""

            if message.lastEditActorId == message.actorId, message.lastEditActorType == "users" {
                editedString = NSLocalizedString("edited", comment: "A message was edited")
                editedString = " (\(editedString))"
            } else {
                editedString = NSLocalizedString("edited by", comment: "A message was edited by ...")
                editedString = " (\(editedString) \(lastEditActorDisplayName))"
            }

            let editedAttributedString = editedString.withTextColor(.tertiaryLabel)

            titleLabel.append(editedAttributedString)
        }

        self.titleLabel.attributedText = titleLabel

        let activeAccount = NCDatabaseManager.sharedInstance().activeAccount()
        var shouldShowDeliveryStatus = false
        var shouldShowReadStatus = false

        if let room = NCDatabaseManager.sharedInstance().room(withToken: message.token, forAccountId: activeAccount.accountId) {
            shouldShowDeliveryStatus = NCDatabaseManager.sharedInstance().roomHasTalkCapability(kCapabilityChatReadStatus, for: room)

            if let roomCapabilities = NCDatabaseManager.sharedInstance().roomTalkCapabilities(for: room) {
                shouldShowReadStatus = !(roomCapabilities.readStatusPrivacy)
            }
        }

        // This check is just a workaround to fix the issue with the deleted parents returned by the API.
        if let parent = message.parent {
            self.showQuotePart()

            let quoteString = parent.parsedMarkdownForChat()?.string ?? ""
            self.quotedMessageView?.messageLabel.text = quoteString
            self.quotedMessageView?.actorLabel.attributedText = parent.actor.attributedDisplayName
            self.quotedMessageView?.highlighted = parent.isMessage(from: activeAccount.userId)
            self.quotedMessageView?.avatarView.setActorAvatar(forMessage: parent)
        }

        if message.isGroupMessage, message.parent == nil {
            self.headerPart.isHidden = true
        }

        // When `setDeliveryState` is not called, we still need to make sure the placeholder view is removed
        self.statusView.subviews.forEach { $0.removeFromSuperview() }

        if message.isDeleting {
            self.setDeliveryState(to: .deleting)
        } else if message.sendingFailed {
            self.setDeliveryState(to: .failed)
        } else if message.isTemporary {
            self.setDeliveryState(to: .sending)
        } else if message.isMessage(from: activeAccount.userId), shouldShowDeliveryStatus {
            if lastCommonRead >= message.messageId, shouldShowReadStatus {
                self.setDeliveryState(to: .read)
            } else {
                self.setDeliveryState(to: .sent)
            }
        } else if message.isSilent {
            self.setDeliveryState(to: .silent)
        }

        let reactionsArray = message.reactionsArray()

        if !reactionsArray.isEmpty {
            self.showReactionsPart()
            self.reactionView?.updateReactions(reactions: reactionsArray)
        }

        if message.containsURL() {
            self.showReferencePart()

            message.getReferenceData { message, referenceDataRaw, url in
                guard let cellMessage = self.message,
                      let referenceMessage = message,
                      cellMessage.isSameMessage(referenceMessage)
                else { return }

                if referenceDataRaw == nil, let deckCard = cellMessage.deckCard() {
                    // In case we were unable to retrieve reference data (for example if the user has no permissions)
                    // but the message is a shared deck card, we use the shared information to show the deck view
                    self.referenceView?.update(for: deckCard)
                } else if let referenceData = referenceDataRaw as? [String: [String: AnyObject]], let url {
                    self.referenceView?.update(for: referenceData, and: url)
                }
            }
        }

        if message.isReplyable, !message.isDeleting {
            self.addSlideToReplyGestureRecognizer(for: message)
        }

        if message.isVoiceMessage {
            // Audio message
            self.setupForAudioCell(with: message)
        } else if message.poll != nil {
            // Poll message
            self.setupForPollCell(with: message)
        } else if message.file() != nil {
            // File message
            self.setupForFileCell(with: message, with: activeAccount)
        } else if message.geoLocation() != nil {
            // Location message
            self.setupForLocationCell(with: message)
        } else {
            // Normal text message
            self.setupForMessageCell(with: message)
        }

        if message.isDeletedMessage {
            self.statusView.isHidden = true
            self.messageTextView?.textColor = .tertiaryLabel
        }

        NotificationCenter.default.addObserver(self, selector: #selector(didChangeIsDownloading(notification:)), name: NSNotification.Name.NCChatFileControllerDidChangeIsDownloading, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(didChangeDownloadProgress(notification:)), name: NSNotification.Name.NCChatFileControllerDidChangeDownloadProgress, object: nil)
    }

    func addSlideToReplyGestureRecognizer(for message: NCChatMessage) {
        if let action = DRCellSlideAction(forFraction: 0.2) {
            action.behavior = .pullBehavior
            action.activeColor = .label
            action.inactiveColor = .placeholderText
            action.activeBackgroundColor = self.backgroundColor
            action.inactiveBackgroundColor = self.backgroundColor
            action.icon = UIImage(systemName: "arrowshape.turn.up.left")

            action.willTriggerBlock = { [unowned self] _, _ -> Void in
                self.delegate?.cellWantsToReply(to: message)
            }

            action.didChangeStateBlock = { _, active -> Void in
                if active {
                    // Actuate `Peek` feedback (weak boom)
                    AudioServicesPlaySystemSound(1519)
                }
            }

            let replyGestureRecognizer = DRCellSlideGestureRecognizer()
            self.replyGestureRecognizer = replyGestureRecognizer

            replyGestureRecognizer.leftActionStartPosition = 80
            replyGestureRecognizer.addActions(action)

            self.addGestureRecognizer(replyGestureRecognizer)
        }
    }

    func setDeliveryState(to deliveryState: ChatMessageDeliveryState) {
        self.statusView.subviews.forEach { $0.removeFromSuperview() }

        if deliveryState == .sending || deliveryState == .deleting {
            let activityIndicator = MDCActivityIndicator(frame: .init(x: 0, y: 0, width: 20, height: 20))

            activityIndicator.radius = 7.0
            activityIndicator.cycleColors = [.systemGray2]
            activityIndicator.startAnimating()
            activityIndicator.heightAnchor.constraint(equalToConstant: 20).isActive = true

            self.statusView.addArrangedSubview(activityIndicator)

        } else if deliveryState == .failed {
            let errorView = UIImageView(frame: .init(x: 0, y: 0, width: 20, height: 20))
            let errorImage = UIImage(systemName: "exclamationmark.circle")?.withTintColor(.red).withRenderingMode(.alwaysOriginal)

            errorView.image = errorImage
            errorView.contentMode = .scaleAspectFit
            errorView.heightAnchor.constraint(equalToConstant: 20).isActive = true

            self.statusView.addArrangedSubview(errorView)

        } else if deliveryState == .silent {
            let silentView = UIImageView(frame: .init(x: 0, y: 0, width: 20, height: 20))
            var silentImage = UIImage(systemName: "bell.slash")?.withTintColor(.systemGray2).withRenderingMode(.alwaysOriginal)
            silentImage = silentImage?.withConfiguration(UIImage.SymbolConfiguration(textStyle: .subheadline))

            silentView.image = silentImage
            silentView.contentMode = .center
            silentView.heightAnchor.constraint(equalToConstant: 20).isActive = true

            self.statusView.addArrangedSubview(silentView)

        } else if deliveryState == .sent || deliveryState == .read {
            var checkImageName = "check"

            if deliveryState == .read {
                checkImageName = "check-all"
            }

            let checkImage = UIImage(named: checkImageName)?.withRenderingMode(.alwaysTemplate)
            let checkView = UIImageView(frame: .init(x: 0, y: 0, width: 20, height: 20))

            checkView.image = checkImage
            checkView.contentMode = .scaleAspectFit
            checkView.tintColor = .systemGray2
            checkView.accessibilityIdentifier = "MessageSent"
            checkView.heightAnchor.constraint(equalToConstant: 20).isActive = true

            self.statusView.addArrangedSubview(checkView)
        }
    }

    // MARK: - QuotePart

    func showQuotePart() {
        self.quotePart.isHidden = false

        if self.quotedMessageView == nil {
            let quotedMessageView = QuotedMessageView()
            self.quotedMessageView = quotedMessageView

            quotedMessageView.translatesAutoresizingMaskIntoConstraints = false

            self.quotePart.addSubview(quotedMessageView)

            NSLayoutConstraint.activate([
                quotedMessageView.leftAnchor.constraint(equalTo: self.messageBodyView.leftAnchor),
                quotedMessageView.rightAnchor.constraint(equalTo: self.quotePart.rightAnchor, constant: -10),
                quotedMessageView.topAnchor.constraint(equalTo: self.quotePart.topAnchor),
                quotedMessageView.bottomAnchor.constraint(equalTo: self.quotePart.bottomAnchor)
            ])

            let quoteTap = UITapGestureRecognizer(target: self, action: #selector(quoteTapped(_:)))
            quotedMessageView.addGestureRecognizer(quoteTap)
        }
    }

    @objc func quoteTapped(_ sender: UITapGestureRecognizer?) {
        if let parent = self.message?.parent {
            self.delegate?.cellWantsToScroll(to: parent)
        }
    }

    // MARK: - ReferencePart

    func showReferencePart() {
        self.referencePart.isHidden = false

        if self.referenceView == nil {
            let referenceView = ReferenceView()
            self.referenceView = referenceView

            referenceView.translatesAutoresizingMaskIntoConstraints = false

            self.referencePart.addSubview(referenceView)

            NSLayoutConstraint.activate([
                referenceView.leftAnchor.constraint(equalTo: self.messageBodyView.leftAnchor),
                referenceView.rightAnchor.constraint(equalTo: self.referencePart.rightAnchor, constant: -10),
                referenceView.topAnchor.constraint(equalTo: self.referencePart.topAnchor),
                referenceView.bottomAnchor.constraint(equalTo: self.referencePart.bottomAnchor, constant: -5)
            ])
        }
    }

    // MARK: - ReactionsPart

    func showReactionsPart() {
        self.reactionPart.isHidden = false

        if self.reactionView == nil {
            let flowLayout = UICollectionViewFlowLayout()
            flowLayout.scrollDirection = .horizontal

            let reactionView = ReactionsView(frame: .init(x: 0, y: 0, width: 50, height: 40), collectionViewLayout: flowLayout)
            reactionView.reactionsDelegate = self
            self.reactionView = reactionView

            reactionView.translatesAutoresizingMaskIntoConstraints = false

            self.reactionPart.addSubview(reactionView)

            NSLayoutConstraint.activate([
                reactionView.leftAnchor.constraint(equalTo: self.messageBodyView.leftAnchor),
                reactionView.rightAnchor.constraint(equalTo: self.reactionPart.rightAnchor, constant: -10),
                reactionView.topAnchor.constraint(equalTo: self.reactionPart.topAnchor),
                reactionView.bottomAnchor.constraint(equalTo: self.reactionPart.bottomAnchor, constant: -10)
            ])
        }
    }

    // MARK: - ReactionsView Delegate

    func didSelectReaction(reaction: NCChatReaction) {
        if let message = self.message {
            self.delegate?.cellDidSelectedReaction(reaction, for: message)
        }
    }

    // MARK: - Avatar User Menu

    func getDeferredUserMenu() -> UIMenu? {
        guard let message = self.message else { return nil }

        let activeAccount = NCDatabaseManager.sharedInstance().activeAccount()

        if message.actorType != "users" || message.actorId == activeAccount.userId {
            return nil
        }

        // Use an uncached provider so local time is not cached
        let deferredMenuElement = UIDeferredMenuElement.uncached { completion in
            self.getMenuUserAction(for: message) { items in
                completion(items)
            }
        }

        return UIMenu(title: message.actorDisplayName, children: [deferredMenuElement])
    }

    func getMenuUserAction(for message: NCChatMessage, completionBlock: @escaping ([UIMenuElement]) -> Void) {
        let activeAccount = NCDatabaseManager.sharedInstance().activeAccount()

        NCAPIController.sharedInstance().getUserActions(forUser: message.actorId, using: activeAccount) { userActionsRaw, error in
            guard error == nil,
                  let userActionsDict = userActionsRaw as? [String: AnyObject],
                  let userActions = userActionsDict["actions"] as? [[String: String]],
                  let userId = userActionsDict["userId"] as? String
            else {
                let errorAction = UIAction(title: NSLocalizedString("No actions available", comment: "")) { _ in }
                errorAction.attributes = .disabled
                completionBlock([errorAction])

                return
            }

            var menuItems: [UIMenuElement] = []

            for userAction in userActions {
                guard let appId = userAction["appId"],
                      let title = userAction["title"],
                      let link = userAction["hyperlink"],
                      let linkEncoded = link.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
                else { continue }

                if appId == "spreed" {
                    let talkAction = UIAction(title: title, image: UIImage(named: "talk-20")?.withRenderingMode(.alwaysTemplate)) { _ in
                        NotificationCenter.default.post(name: NSNotification.Name.NCChatViewControllerTalkToUserNotification, object: self, userInfo: ["actorId": userId])
                    }

                    menuItems.append(talkAction)
                    continue
                }

                let otherAction = UIAction(title: title) { _ in
                    if let actionUrl = URL(string: linkEncoded) {
                        UIApplication.shared.open(actionUrl)
                    }
                }

                if appId == "profile" {
                    otherAction.image = UIImage(systemName: "person")
                } else if appId == "email" {
                    otherAction.image = UIImage(systemName: "envelope")
                } else if appId == "timezone" {
                    otherAction.image = UIImage(systemName: "clock")
                } else if appId == "social" {
                    otherAction.image = UIImage(systemName: "heart")
                }

                menuItems.append(otherAction)
            }

            completionBlock(menuItems)
        }
    }

    // MARK: - File status / activity indicator

    func clearFileStatusView() {
            self.fileActivityIndicator?.stopAnimating()
            self.fileActivityIndicator?.removeFromSuperview()
            self.fileActivityIndicator = nil
    }

    func addActivityIndicator(with progress: Float) {
        self.clearFileStatusView()

        let fileActivityIndicator = MDCActivityIndicator(frame: .init(x: 0, y: 0, width: 20, height: 20))
        self.fileActivityIndicator = fileActivityIndicator

        fileActivityIndicator.radius = 7
        fileActivityIndicator.cycleColors = [.systemGray2]

        if progress > 0 {
            fileActivityIndicator.indicatorMode = .determinate
            fileActivityIndicator.setProgress(progress, animated: false)
        }

        fileActivityIndicator.startAnimating()
        fileActivityIndicator.heightAnchor.constraint(equalToConstant: 20).isActive = true
        self.statusView.addArrangedSubview(fileActivityIndicator)
    }

    // MARK: - File notifications

    @objc func didChangeIsDownloading(notification: Notification) {
        DispatchQueue.main.async {
            // Make sure this notification is really for this cell
            guard let fileParameter = self.message?.file(),
                  let receivedStatus = NCChatFileStatus.getStatus(from: notification, for: fileParameter)
            else { return }

            if receivedStatus.isDownloading, self.fileActivityIndicator == nil {
                // Immediately show an indeterminate indicator as long as we don't have a progress value
                self.addActivityIndicator(with: 0)
            } else if !receivedStatus.isDownloading, self.fileActivityIndicator != nil {
                self.clearFileStatusView()
            }
        }
    }

    @objc func didChangeDownloadProgress(notification: Notification) {
        DispatchQueue.main.async {
            // Make sure this notification is really for this cell
            guard let fileParameter = self.message?.file(),
                  let receivedStatus = NCChatFileStatus.getStatus(from: notification, for: fileParameter)
            else { return }

            if self.fileActivityIndicator != nil {
                // Switch to determinate-mode and show progress
                if receivedStatus.canReportProgress {
                    self.fileActivityIndicator?.indicatorMode = .determinate
                    self.fileActivityIndicator?.setProgress(Float(receivedStatus.downloadProgress), animated: true)
                }
            } else {
                // Make sure we have an activity indicator added to this cell
                self.addActivityIndicator(with: Float(receivedStatus.downloadProgress))
            }
        }
    }
}