// 
// Copyright 2020-2024 New Vector Ltd.
//
// SPDX-License-Identifier: AGPL-3.0-only
// Please see LICENSE in the repository root for full details.
//

import UIKit
import Reusable
import ReadMoreTextView

class RoomInfoBasicView: UIView {
    
    private enum TopicTextViewConstants {
        static let font = UIFont.systemFont(ofSize: 15)
        static let defaultNumberOfLines = 4
        static let moreLessTextPadding = UIEdgeInsets(top: 16, left: 16, bottom: 16, right: 16)
    }

    @IBOutlet private weak var mainStackView: UIStackView!
    @IBOutlet private weak var avatarContainerView: UIView!
    @IBOutlet private weak var avatarImageView: MXKImageView!
    @IBOutlet private weak var badgeImageView: UIImageView!
    @IBOutlet private weak var presenceIndicatorView: PresenceIndicatorView! {
        didSet {
            presenceIndicatorView.delegate = self
        }
    }
    @IBOutlet private weak var roomNameStackView: UIStackView!
    @IBOutlet private weak var roomNameLabel: UILabel!
    @IBOutlet private weak var roomAddressLabel: UILabel!
    @IBOutlet private weak var topicContainerView: UIView!
    @IBOutlet private weak var topicTitleLabel: UILabel! {
        didSet {
            topicTitleLabel.text = VectorL10n.roomDetailsTopic
        }
    }
    @IBOutlet private weak var roomTopicTextView: ReadMoreTextView! {
        didSet {
            roomTopicTextView.contentInset = .zero
            roomTopicTextView.textContainerInset = .zero
            roomTopicTextView.textContainer.lineFragmentPadding = 0
            roomTopicTextView.readMoreTextPadding = TopicTextViewConstants.moreLessTextPadding
            roomTopicTextView.readLessTextPadding = TopicTextViewConstants.moreLessTextPadding
            roomTopicTextView.shouldTrim = true
            roomTopicTextView.maximumNumberOfLines = TopicTextViewConstants.defaultNumberOfLines
            roomTopicTextView.onSizeChange = { _ in
                self.roomTopicTextView.textAlignment = .left
                self.onTopicSizeChange?(self)
            }
        }
    }
    @IBOutlet private weak var securityContainerView: UIView!
    @IBOutlet private weak var securityTitleLabel: UILabel!
    @IBOutlet private weak var securityInformationLabel: UILabel!
    
    private var pillImageView: UIImageView?
    private var roomDisplayName: String?
    private var isRoomFederated: Bool = false
    
    /// Block to be invoked when topic text view changes its content size.
    var onTopicSizeChange: ((RoomInfoBasicView) -> Void)?
    
    /// Force to update topic text view trimming.
    func updateTrimmingOnTopic() {
        roomTopicTextView.setNeedsUpdateTrim()
        let currentValue = roomTopicTextView.shouldTrim
        roomTopicTextView.shouldTrim = !currentValue
        roomTopicTextView.shouldTrim = currentValue
        roomTopicTextView.textAlignment = .left
    }
    
    func configure(withViewData viewData: RoomInfoBasicViewData) {
        let avatarImage = AvatarGenerator.generateAvatar(forMatrixItem: viewData.roomId, withDisplayName: viewData.roomDisplayName)
        
        avatarImageView.contentMode = .scaleAspectFill

        // bwi: update room avatar
        if let avatarUrl = viewData.avatarUrl {
            if !avatarUrl.isEmpty {
                avatarImageView.enableInMemoryCache = true
                
                avatarImageView.setImageURI(avatarUrl,
                                            withType: nil,
                                            andImageOrientation: .up,
                                            toFitViewSize: avatarImageView.frame.size,
                                            with: MXThumbnailingMethodScale,
                                            previewImage: avatarImage,
                                            mediaManager: viewData.mediaManager)
            } else {
                avatarImageView.image = avatarImage
            }
        } else {
            avatarImageView.image = avatarImage
        }

        if BWIBuildSettings.shared.bwiUseCustomPersonalNotesAvatar {
            if let session = AppDelegate.theDelegate().mxSessions.first as? MXSession {
                let service = PersonalNotesDefaultService(mxSession: session)
                if let personalNotesRoomId = service.personalNotesRoomId(), personalNotesRoomId == viewData.roomId {
                    avatarImageView.image = UIImage(named: service.avatarImageUrl())
                }
            }
        }
        
        // bwi: 5216 - federation
        if BWIBuildSettings.shared.isFederationEnabled && viewData.isFederated {
            isRoomFederated = true
            self.roomDisplayName = viewData.roomDisplayName
            // add imageview for the pill if it doesn't exist
            if pillImageView == nil {
                let imageView = FederationIconHelper.shared.getFederatedIconImageView(avatarFrame: avatarImageView.frame)
                pillImageView = imageView
                pillImageView?.contentMode = .scaleAspectFit
                avatarContainerView.addSubview(imageView)
            }
            
            pillImageView?.image = FederationIconHelper.shared.federationBadgeImage()
            roomNameLabel.attributedText = FederationIconHelper.shared.roomNameWithFederationPill(roomDisplayName: viewData.roomDisplayName, font: roomNameLabel.font)
        } else {
            roomNameLabel.text = viewData.roomDisplayName
            isRoomFederated = false
            pillImageView?.image = nil
        }
        
        roomNameLabel.numberOfLines = 0

        badgeImageView.image = nil
        if BWIBuildSettings.shared.showMatrixIDinRoomInfoScreen {
            roomAddressLabel.text = viewData.mainRoomAlias
            roomAddressLabel.isHidden = roomAddressLabel.text?.isEmpty ?? true
        } else {
            roomAddressLabel.text = nil
            roomAddressLabel.isHidden = true
        }
        roomTopicTextView.text = viewData.roomTopic
        topicContainerView.isHidden = roomTopicTextView.text?.isEmpty ?? true
        securityTitleLabel.text = VectorL10n.securitySettingsTitle
        securityInformationLabel.text = viewData.isDirect ?
            VectorL10n.roomParticipantsSecurityInformationRoomEncryptedForDm :
        BWIL10n.roomParticipantsSecurityInformationRoomEncrypted
        securityContainerView.isHidden = !viewData.isEncrypted
        if let directUserId = viewData.directUserId {
            presenceIndicatorView.configure(userId: directUserId, presence: viewData.directUserPresence)
        } else {
            presenceIndicatorView.stopListeningPresenceUpdates()
        }
        updateRoomNameLabelPosition()
        updateBadgeImageViewPosition(isPresenceDisplayed: viewData.directUserPresence != .unknown)
    }
       
    
    // bwi
    private func updateRoomNameLabelPosition() {
        let margins = self.layoutMarginsGuide
        roomNameLabel.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
        roomNameLabel.trailingAnchor.constraint(equalTo: margins.trailingAnchor).isActive = true
    }
    
    private func updateBadgeImageViewPosition(isPresenceDisplayed: Bool) {
        guard badgeImageView.image != nil else {
            badgeImageView.isHidden = true
            return
        }

        badgeImageView.isHidden = false
        // Update badge position if it doesn't match expectation.
        // If presence is displayed, badge should be in the name stack.
        let isBadgeInRoomNameStackView = roomNameStackView.arrangedSubviews.contains(badgeImageView)
        switch (isPresenceDisplayed, isBadgeInRoomNameStackView) {
        case (true, false):
            badgeImageView.removeFromSuperview()
            roomNameStackView.insertArrangedSubview(badgeImageView, at: 0)
        case (false, true):
            roomNameStackView.removeArrangedSubview(badgeImageView)
            avatarContainerView.addSubview(badgeImageView)
            badgeImageView.trailingAnchor.constraint(equalTo: avatarContainerView.trailingAnchor).isActive = true
            badgeImageView.bottomAnchor.constraint(equalTo: avatarContainerView.bottomAnchor).isActive = true
        case (_, _):
            break
        }
    }
}

extension RoomInfoBasicView: NibLoadable {}

extension RoomInfoBasicView: Themable {
    
    func update(theme: Theme) {
        backgroundColor = theme.headerBackgroundColor
        roomNameLabel.textColor = theme.textPrimaryColor
        roomAddressLabel.textColor = theme.textSecondaryColor
        topicTitleLabel.textColor = theme.textSecondaryColor
        roomTopicTextView.textColor = theme.textPrimaryColor
        roomTopicTextView.linkTextAttributes = [
            NSAttributedString.Key.font: TopicTextViewConstants.font,
            NSAttributedString.Key.foregroundColor: theme.tintColor
        ]
        let mutableReadMore = NSMutableAttributedString(string: "… ", attributes: [
            NSAttributedString.Key.font: TopicTextViewConstants.font,
            NSAttributedString.Key.foregroundColor: theme.textPrimaryColor
        ])
        let attributedMore = NSAttributedString(string: VectorL10n.more, attributes: [
            NSAttributedString.Key.font: TopicTextViewConstants.font,
            NSAttributedString.Key.foregroundColor: theme.tintColor
        ])
        mutableReadMore.append(attributedMore)
        roomTopicTextView.attributedReadMoreText = mutableReadMore
        
        let mutableReadLess = NSMutableAttributedString(string: " ")
        let attributedLess = NSAttributedString(string: VectorL10n.less, attributes: [
            NSAttributedString.Key.font: TopicTextViewConstants.font,
            NSAttributedString.Key.foregroundColor: theme.tintColor
        ])
        mutableReadLess.append(attributedLess)
        roomTopicTextView.attributedReadLessText = mutableReadLess
        
        securityTitleLabel.textColor = theme.textSecondaryColor
        securityInformationLabel.textColor = theme.textPrimaryColor
        presenceIndicatorView.borderColor = theme.headerBackgroundColor
        
        // bwi: 5216 - federation
        if BWIBuildSettings.shared.isFederationEnabled && isRoomFederated {
            if pillImageView != nil {
                pillImageView?.image = FederationIconHelper.shared.federationBadgeImage()
            }
            if let roomDisplayName = self.roomDisplayName {
                roomNameLabel.attributedText = FederationIconHelper.shared.roomNameWithFederationPill(roomDisplayName: roomDisplayName, font: roomNameLabel.font)
            }
        }
    }
    
}

extension RoomInfoBasicView: PresenceIndicatorViewDelegate {
    func presenceIndicatorViewDidUpdateVisibility(_ presenceIndicatorView: PresenceIndicatorView, isHidden: Bool) {
        updateRoomNameLabelPosition()
        updateBadgeImageViewPosition(isPresenceDisplayed: !isHidden)
    }
}