//
//  NCViewerNextcloudText.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 12/12/19.
//  Copyright © 2019 Marino Faggiana. All rights reserved.
//
//  Author Marino Faggiana <marino.faggiana@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 WebKit

class NCViewerNextcloudText: UIViewController, WKNavigationDelegate, WKScriptMessageHandler {

    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    var webView = WKWebView()
    var bottomConstraint: NSLayoutConstraint?

    var link: String = ""
    var editor: String = ""
    var metadata: tableMetadata = tableMetadata()
    var imageIcon: UIImage?

    // MARK: - View Life Cycle

    required init?(coder: NSCoder) {
        super.init(coder: coder)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationItem.rightBarButtonItem = UIBarButtonItem(image: UIImage(named: "more")!.image(color: NCBrandColor.shared.label, size: 25), style: .plain, target: self, action: #selector(self.openMenuMore))

        navigationController?.navigationBar.prefersLargeTitles = false
        navigationItem.title = metadata.fileNameView

        let config = WKWebViewConfiguration()
        config.websiteDataStore = WKWebsiteDataStore.nonPersistent()
        let contentController = config.userContentController
        contentController.add(self, name: "DirectEditingMobileInterface")

        webView = WKWebView(frame: CGRect.zero, configuration: config)
        webView.navigationDelegate = self
        view.addSubview(webView)

        webView.translatesAutoresizingMaskIntoConstraints = false
        webView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0).isActive = true
        webView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0).isActive = true
        webView.topAnchor.constraint(equalTo: view.topAnchor, constant: 0).isActive = true
        bottomConstraint = webView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0)
        bottomConstraint?.isActive = true

        var request = URLRequest(url: URL(string: link)!)
        request.addValue("true", forHTTPHeaderField: "OCS-APIRequest")
        let language = NSLocale.preferredLanguages[0] as String
        request.addValue(language, forHTTPHeaderField: "Accept-Language")

        if editor == NCGlobal.shared.editorOnlyoffice {
            webView.customUserAgent = NCUtility.shared.getCustomUserAgentOnlyOffice()
        } else {
            webView.customUserAgent = CCUtility.getUserAgent()
        }

        webView.load(request)
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        appDelegate.activeViewController = self

        //
        NotificationCenter.default.addObserver(self, selector: #selector(favoriteFile(_:)), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterFavoriteFile), object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(viewUnload), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterMenuDetailClose), object: nil)

        NotificationCenter.default.addObserver(self, selector: #selector(keyboardDidShow), name: UIResponder.keyboardDidShowNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        if let navigationController = self.navigationController {
            if !navigationController.viewControllers.contains(self) {
            }
        }

        //
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterFavoriteFile), object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterMenuDetailClose), object: nil)

        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardDidShowNotification, object: nil)
        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
    }

    @objc func viewUnload() {

        navigationController?.popViewController(animated: true)
    }

    // MARK: - NotificationCenter

    @objc func favoriteFile(_ notification: NSNotification) {

        if let userInfo = notification.userInfo as NSDictionary? {
            if let ocId = userInfo["ocId"] as? String, let metadata = NCManageDatabase.shared.getMetadataFromOcId(ocId) {

                if metadata.ocId == self.metadata.ocId {
                    self.metadata = metadata
                }
            }
        }
    }

    @objc func keyboardDidShow(notification: Notification) {

        guard let info = notification.userInfo else { return }
        guard let frameInfo = info[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else { return }
        let keyboardFrame = frameInfo.cgRectValue
        let height = keyboardFrame.size.height
        bottomConstraint?.constant = -height
    }

    @objc func keyboardWillHide(notification: Notification) {

        bottomConstraint?.constant = 0
    }

    // MARK: - Action

    @objc func openMenuMore() {
        if imageIcon == nil { imageIcon = UIImage(named: "file_txt") }
        NCViewer.shared.toggleMenu(viewController: self, metadata: metadata, webView: true, imageIcon: imageIcon)
    }

    // MARK: -

    public func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {

        if message.name == "DirectEditingMobileInterface" {

            if message.body as? String == "close" {
                viewUnload()
            }

            if message.body as? String == "share" {
                NCFunctionCenter.shared.openShare(viewController: self, metadata: metadata, indexPage: .sharing)
            }

            if message.body as? String == "loading" {
                print("loading")
            }

            if message.body as? String == "loaded" {
                print("loaded")
            }

            if message.body as? String == "paste" {
                self.paste(self)
            }
        }
    }

    // MARK: -

    public func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
        if let serverTrust = challenge.protectionSpace.serverTrust {
            completionHandler(Foundation.URLSession.AuthChallengeDisposition.useCredential, URLCredential(trust: serverTrust))
        } else {
            completionHandler(URLSession.AuthChallengeDisposition.useCredential, nil)
        }
    }

    public func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
        print("didStartProvisionalNavigation")
    }

    public func webView(_ webView: WKWebView, didReceiveServerRedirectForProvisionalNavigation navigation: WKNavigation!) {
        print("didReceiveServerRedirectForProvisionalNavigation")
    }

    public func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
        NCUtility.shared.stopActivityIndicator()
    }
}

extension NCViewerNextcloudText: UINavigationControllerDelegate {

    override func didMove(toParent parent: UIViewController?) {
        super.didMove(toParent: parent)

        if parent == nil {
            NotificationCenter.default.postOnMainThread(name: NCGlobal.shared.notificationCenterReloadDataSourceNetworkForced, userInfo: ["serverUrl": self.metadata.serverUrl])
        }
    }
}