//
//  NCShare.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 17/07/2019.
//  Copyright © 2019 Marino Faggiana. All rights reserved.
//  Copyright © 2022 Henrik Storch. All rights reserved.
//
//  Author Marino Faggiana <marino.faggiana@nextcloud.com>
//  Author Henrik Storch <henrik.storch@nextcloud.com>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import UIKit
import Parchment
import DropDown
import NextcloudKit
import MarqueeLabel

class NCShare: UIViewController, NCShareNetworkingDelegate, NCSharePagingContent {

    @IBOutlet weak var viewContainerConstraint: NSLayoutConstraint!
    @IBOutlet weak var sharedWithYouByView: UIView!
    @IBOutlet weak var sharedWithYouByImage: UIImageView!
    @IBOutlet weak var sharedWithYouByLabel: UILabel!
    @IBOutlet weak var sharedWithYouByNoteImage: UIImageView!
    @IBOutlet weak var sharedWithYouByNote: MarqueeLabel!
    @IBOutlet weak var searchFieldTopConstraint: NSLayoutConstraint!
    @IBOutlet weak var searchField: UITextField!
    var textField: UITextField? { searchField }

    @IBOutlet weak var tableView: UITableView!

    weak var appDelegate = UIApplication.shared.delegate as? AppDelegate

    public var metadata: tableMetadata?
    public var sharingEnabled = true
    public var height: CGFloat = 0

    var canReshare: Bool {
        guard let metadata = metadata else { return true }
        return ((metadata.sharePermissionsCollaborationServices & NCGlobal.shared.permissionShareShare) != 0)
    }

    var shares: (firstShareLink: tableShare?, share: [tableShare]?) = (nil, nil)

    private var dropDown = DropDown()
    var networking: NCShareNetworking?

    // MARK: - View Life Cycle

    override func viewDidLoad() {
        super.viewDidLoad()

        view.backgroundColor = .systemBackground

        viewContainerConstraint.constant = height
        searchFieldTopConstraint.constant = 10

        searchField.placeholder = NSLocalizedString("_shareLinksearch_placeholder_", comment: "")
        searchField.autocorrectionType = .no

        tableView.dataSource = self
        tableView.delegate = self
        tableView.allowsSelection = false
        tableView.backgroundColor = .systemBackground

        tableView.register(UINib(nibName: "NCShareLinkCell", bundle: nil), forCellReuseIdentifier: "cellLink")
        tableView.register(UINib(nibName: "NCShareUserCell", bundle: nil), forCellReuseIdentifier: "cellUser")

        NotificationCenter.default.addObserver(self, selector: #selector(reloadData), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterReloadDataNCShare), object: nil)

        guard let metadata = metadata else { return }

        if metadata.e2eEncrypted {
            let direcrory = NCManageDatabase.shared.getTableDirectory(account: metadata.account, serverUrl: metadata.serverUrl)
            if NCGlobal.shared.capabilityE2EEApiVersion == NCGlobal.shared.e2eeVersionV12 ||
                (NCGlobal.shared.capabilityE2EEApiVersion == NCGlobal.shared.e2eeVersionV20 && direcrory?.e2eEncrypted ?? false) {
                // searchField.isEnabled = false
                searchFieldTopConstraint.constant = -50
                searchField.isHidden = true
            }
        } else {
            checkSharedWithYou()
        }

        reloadData()

        networking = NCShareNetworking(metadata: metadata, view: self.view, delegate: self)
        if sharingEnabled {
            let isVisible = (self.navigationController?.topViewController as? NCSharePaging)?.page == .sharing
            networking?.readShare(showLoadingIndicator: isVisible)
        }
    }

    func makeNewLinkShare() {
        guard
            let advancePermission = UIStoryboard(name: "NCShare", bundle: nil).instantiateViewController(withIdentifier: "NCShareAdvancePermission") as? NCShareAdvancePermission,
            let navigationController = self.navigationController,
            let metadata = self.metadata else { return }
        self.checkEnforcedPassword(shareType: NCShareCommon.shared.SHARE_TYPE_LINK) { password in
            advancePermission.networking = self.networking
            advancePermission.share = NCTableShareOptions.shareLink(metadata: metadata, password: password)
            advancePermission.metadata = self.metadata
            navigationController.pushViewController(advancePermission, animated: true)
        }
    }

    // Shared with you by ...
    func checkSharedWithYou() {
        guard let appDelegate = self.appDelegate, let metadata = metadata, !metadata.ownerId.isEmpty, metadata.ownerId != appDelegate.userId else { return }

        if !canReshare {
            searchField.isEnabled = false
            searchField.placeholder = NSLocalizedString("_share_reshare_disabled_", comment: "")
        }

        searchFieldTopConstraint.constant = 65
        sharedWithYouByView.isHidden = false
        sharedWithYouByLabel.text = NSLocalizedString("_shared_with_you_by_", comment: "") + " " + metadata.ownerDisplayName
        sharedWithYouByImage.image = NCUtility.shared.loadUserImage(
            for: metadata.ownerId,
            displayName: metadata.ownerDisplayName,
            userBaseUrl: appDelegate)
        sharedWithYouByLabel.accessibilityHint = NSLocalizedString("_show_profile_", comment: "")

        let shareAction = UITapGestureRecognizer(target: self, action: #selector(openShareProfile))
        sharedWithYouByImage.addGestureRecognizer(shareAction)
        let shareLabelAction = UITapGestureRecognizer(target: self, action: #selector(openShareProfile))
        sharedWithYouByLabel.addGestureRecognizer(shareLabelAction)

        if !metadata.note.isEmpty {
            searchFieldTopConstraint.constant = 95
            sharedWithYouByNoteImage.isHidden = false
            sharedWithYouByNoteImage.image = NCUtility.shared.loadImage(named: "note.text", color: .gray)
            sharedWithYouByNote.isHidden = false
            sharedWithYouByNote.text = metadata.note
            sharedWithYouByNote.textColor = .label
            sharedWithYouByNote.trailingBuffer = sharedWithYouByNote.frame.width
        } else {
            sharedWithYouByNoteImage.isHidden = true
            sharedWithYouByNote.isHidden = true
        }

        let fileName = appDelegate.userBaseUrl + "-" + metadata.ownerId + ".png"

        if NCManageDatabase.shared.getImageAvatarLoaded(fileName: fileName) == nil {
            let fileNameLocalPath = String(CCUtility.getDirectoryUserData()) + "/" + fileName
            let etag = NCManageDatabase.shared.getTableAvatar(fileName: fileName)?.etag

            NextcloudKit.shared.downloadAvatar(
                user: metadata.ownerId,
                fileNameLocalPath: fileNameLocalPath,
                sizeImage: NCGlobal.shared.avatarSize,
                avatarSizeRounded: NCGlobal.shared.avatarSizeRounded,
                etag: etag) { _, imageAvatar, _, etag, error in
                    if error == .success, let etag = etag, let imageAvatar = imageAvatar {
                        NCManageDatabase.shared.addAvatar(fileName: fileName, etag: etag)
                        self.sharedWithYouByImage.image = imageAvatar
                    } else if error.errorCode == NCGlobal.shared.errorNotModified, let imageAvatar = NCManageDatabase.shared.setAvatarLoaded(fileName: fileName) {
                        self.sharedWithYouByImage.image = imageAvatar
                    }
                }
        }
    }

    // MARK: - Notification Center

    @objc func openShareProfile() {
        guard let metadata = metadata else { return }
        self.showProfileMenu(userId: metadata.ownerId)
    }

    // MARK: -

    @objc func reloadData() {
        if let metadata = metadata {
            shares = NCManageDatabase.shared.getTableShares(metadata: metadata)
        }
        tableView.reloadData()
    }

    // MARK: - IBAction

    @IBAction func searchFieldDidEndOnExit(textField: UITextField) {
        guard let searchString = textField.text, !searchString.isEmpty else { return }
        if searchString.contains("@"), !NCUtility.shared.isValidEmail(searchString) { return }
        networking?.getSharees(searchString: searchString)
    }

    func checkEnforcedPassword(shareType: Int, completion: @escaping (String?) -> Void) {
        guard NCGlobal.shared.capabilityFileSharingPubPasswdEnforced,
              shareType == NCShareCommon.shared.SHARE_TYPE_LINK || shareType == NCShareCommon.shared.SHARE_TYPE_EMAIL
        else { return completion(nil) }

        self.present(UIAlertController.password(titleKey: "_enforce_password_protection_", completion: completion), animated: true)
    }

    // MARK: - NCShareNetworkingDelegate

    func readShareCompleted() {
        NotificationCenter.default.postOnMainThread(name: NCGlobal.shared.notificationCenterReloadDataNCShare)
    }

    func shareCompleted() {
        NotificationCenter.default.postOnMainThread(name: NCGlobal.shared.notificationCenterReloadDataNCShare)
    }

    func unShareCompleted() {
        self.reloadData()
    }

    func updateShareWithError(idShare: Int) {
        self.reloadData()
    }

    func getSharees(sharees: [NKSharee]?) {

        guard let sharees = sharees, let appDelegate = appDelegate else { return }

        dropDown = DropDown()
        let appearance = DropDown.appearance()

        appearance.backgroundColor = .systemBackground
        appearance.cornerRadius = 10
        appearance.shadowColor = UIColor(white: 0.5, alpha: 1)
        appearance.shadowOpacity = 0.9
        appearance.shadowRadius = 25
        appearance.animationduration = 0.25
        appearance.textColor = .darkGray
        appearance.setupMaskedCorners([.layerMaxXMaxYCorner, .layerMinXMaxYCorner])

        for sharee in sharees {
            var label = sharee.label
            if sharee.shareType == NCShareCommon.shared.SHARE_TYPE_CIRCLE {
                label += " (\(sharee.circleInfo), \(sharee.circleOwner))"
            }
            dropDown.dataSource.append(label)
        }

        dropDown.anchorView = searchField
        dropDown.bottomOffset = CGPoint(x: 0, y: searchField.bounds.height)
        dropDown.width = searchField.bounds.width
        dropDown.direction = .bottom

        dropDown.cellNib = UINib(nibName: "NCSearchUserDropDownCell", bundle: nil)
        dropDown.customCellConfiguration = { (index: Index, _, cell: DropDownCell) -> Void in
            guard let cell = cell as? NCSearchUserDropDownCell else { return }
            let sharee = sharees[index]
            cell.setupCell(sharee: sharee, baseUrl: appDelegate)
        }

        dropDown.selectionAction = { index, _ in
            let sharee = sharees[index]
            guard
                let advancePermission = UIStoryboard(name: "NCShare", bundle: nil).instantiateViewController(withIdentifier: "NCShareAdvancePermission") as? NCShareAdvancePermission,
                let navigationController = self.navigationController,
                let metadata = self.metadata else { return }
            self.checkEnforcedPassword(shareType: sharee.shareType) { password in
                let shareOptions = NCTableShareOptions(sharee: sharee, metadata: metadata, password: password)
                advancePermission.share = shareOptions
                advancePermission.networking = self.networking
                advancePermission.metadata = metadata
                navigationController.pushViewController(advancePermission, animated: true)
            }
        }

        dropDown.show()
    }
}

// MARK: - UITableViewDelegate

extension NCShare: UITableViewDelegate {

    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        if indexPath.section == 0, indexPath.row == 0 {
            // internal cell has description
            return 90
        }
        return 70
    }
}

// MARK: - UITableViewDataSource

extension NCShare: UITableViewDataSource {

    func numberOfSections(in tableView: UITableView) -> Int {
        return 2
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        guard let metadata = self.metadata else { return 0}
        var numRows = shares.share?.count ?? 0
        if section == 0 {
            if metadata.e2eEncrypted && NCGlobal.shared.capabilityE2EEApiVersion == NCGlobal.shared.e2eeVersionV12 {
                numRows = 1
            } else {
                // don't allow link creation if reshare is disabled
                numRows = shares.firstShareLink != nil || canReshare ? 2 : 1
            }
        }
        return numRows
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        // Setup default share cells
        guard indexPath.section != 0 else {
            guard let cell = tableView.dequeueReusableCell(withIdentifier: "cellLink", for: indexPath) as? NCShareLinkCell, let metadata = self.metadata
            else { return UITableViewCell() }
            cell.delegate = self
            if metadata.e2eEncrypted && NCGlobal.shared.capabilityE2EEApiVersion == NCGlobal.shared.e2eeVersionV12 {
                cell.tableShare = shares.firstShareLink
            } else {
                if indexPath.row == 0 {
                    cell.isInternalLink = true
                } else if shares.firstShareLink?.isInvalidated != true {
                    cell.tableShare = shares.firstShareLink
                }
            }
            cell.setupCellUI()
            return cell
        }

        guard let appDelegate = appDelegate, let tableShare = shares.share?[indexPath.row] else { return UITableViewCell() }

        // LINK
        if tableShare.shareType == NCShareCommon.shared.SHARE_TYPE_LINK {
            if let cell = tableView.dequeueReusableCell(withIdentifier: "cellLink", for: indexPath) as? NCShareLinkCell {
                cell.indexPath = indexPath
                cell.tableShare = tableShare
                cell.delegate = self
                cell.setupCellUI()
                return cell
            }
        } else {
        // USER / GROUP etc.
            if let cell = tableView.dequeueReusableCell(withIdentifier: "cellUser", for: indexPath) as? NCShareUserCell {
                cell.indexPath = indexPath
                cell.tableShare = tableShare
                cell.delegate = self
                cell.setupCellUI(userId: appDelegate.userId)
                let fileName = appDelegate.userBaseUrl + "-" + tableShare.shareWith + ".png"
                NCOperationQueue.shared.downloadAvatar(user: tableShare.shareWith, dispalyName: tableShare.shareWithDisplayname, fileName: fileName, cell: cell, view: tableView, cellImageView: cell.fileAvatarImageView)
                return cell
            }
        }

        return UITableViewCell()
    }
}