//
//  NCViewerRichdocument.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 06/09/18.
//  Copyright © 2018 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
import NCCommunication

class NCViewerRichdocument: UIViewController, WKNavigationDelegate, WKScriptMessageHandler, NCSelectDelegate {
    
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    var webView = WKWebView()
    var bottomConstraint : NSLayoutConstraint?
    var documentController: UIDocumentInteractionController?
    
    var link: 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()
             
        let config = WKWebViewConfiguration()
        config.websiteDataStore = WKWebsiteDataStore.nonPersistent()
        let contentController = config.userContentController
        contentController.add(self, name: "RichDocumentsMobileInterface")
        
        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")
                
        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(self.grabFocus), name: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterRichdocumentGrabFocus), 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)
        
        //
        navigationItem.rightBarButtonItem = UIBarButtonItem.init(image: UIImage(named: "more")!.image(color: NCBrandColor.shared.label, size: 25), style: .plain, target: self, action: #selector(self.openMenuMore))
        
        navigationItem.hidesBackButton = true
        navigationController?.navigationBar.prefersLargeTitles = false
        navigationItem.title = metadata.fileNameView
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)

        if let navigationController = self.navigationController {
            if !navigationController.viewControllers.contains(self) {
                let functionJS = "OCA.RichDocuments.documentsMain.onClose()"
                webView.evaluateJavaScript(functionJS) { (result, error) in
                    print("close")
                }
            }
        }
  
        //
        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: NSNotification.Name(rawValue: NCGlobal.shared.notificationCenterRichdocumentGrabFocus), 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.init(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 == "RichDocumentsMobileInterface") {
            
            if message.body as? String == "close" {
                viewUnload()
            }
            
            if message.body as? String == "insertGraphic" {
                
                let storyboard = UIStoryboard(name: "NCSelect", bundle: nil)
                let navigationController = storyboard.instantiateInitialViewController() as! UINavigationController
                let viewController = navigationController.topViewController as! NCSelect
                
                viewController.delegate = self
                viewController.typeOfCommandView = .select
                viewController.enableSelectFile = true
                viewController.includeImages = true
                viewController.type = ""
                
                self.present(navigationController, animated: true, completion: nil)
            }
            
            if message.body as? String == "share" {
                NCFunctionCenter.shared.openShare(ViewController: self, metadata: metadata, indexPage: 2)
            }
            
            if let param = message.body as? Dictionary<AnyHashable,Any> {
                
                if param["MessageName"] as? String == "downloadAs" {
                    if let values = param["Values"] as? Dictionary<AnyHashable,Any> {
                        guard let type = values["Type"] as? String else { return }
                        guard let urlString = values["URL"] as? String else { return }
                        guard let url = URL(string: urlString) else { return }
                        let fileNameLocalPath = CCUtility.getDirectoryUserData() + "/" + metadata.fileNameWithoutExt
                    
                        NCUtility.shared.startActivityIndicator(backgroundView: view, blurEffect: true)
                        
                        NCCommunication.shared.download(serverUrlFileName: url, fileNameLocalPath: fileNameLocalPath, requestHandler: { (_) in
                            
                        }, taskHandler: { (_) in
                            
                        }, progressHandler: { (_) in
                            
                        }, completionHandler: { (account, etag, date, lenght, allHeaderFields, error, errorCode, errorDescription) in
                            
                            NCUtility.shared.stopActivityIndicator()
                            
                            if errorCode == 0 && account == self.metadata.account {
                                
                                var item = fileNameLocalPath
                                
                                if let allHeaderFields = allHeaderFields {
                                    if let disposition = allHeaderFields["Content-Disposition"] as? String {
                                        let components = disposition.components(separatedBy: "filename=")
                                        if let filename = components.last?.replacingOccurrences(of: "\"", with: "") {
                                            item = CCUtility.getDirectoryUserData() + "/" + filename
                                            _ = NCUtilityFileSystem.shared.moveFile(atPath: fileNameLocalPath, toPath: item)
                                        }
                                    }
                                }
                                
                                if type == "print" {
                                    let pic = UIPrintInteractionController.shared
                                    let printInfo = UIPrintInfo.printInfo()
                                    printInfo.outputType = UIPrintInfo.OutputType.general
                                    printInfo.orientation = UIPrintInfo.Orientation.portrait
                                    printInfo.jobName = "Document"
                                    pic.printInfo = printInfo
                                    pic.printingItem = URL(fileURLWithPath: item)
                                    pic.present(from: CGRect.zero, in: self.view, animated: true, completionHandler: { (pci, completed, error) in })
                                } else {
                                    self.documentController = UIDocumentInteractionController()
                                    self.documentController?.url = URL(fileURLWithPath: item)
                                    self.documentController?.presentOptionsMenu(from: CGRect.zero, in: self.view, animated: true)
                                }
                            } else {
                                
                                NCContentPresenter.shared.messageNotification("_error_", description: errorDescription, delay: NCGlobal.shared.dismissAfterSecond, type: NCContentPresenter.messageType.error, errorCode: errorCode)
                            }
                        })
                    }
                } else if param["MessageName"] as? String == "fileRename" {
                    if let values = param["Values"] as? Dictionary<AnyHashable,Any> {
                        guard let newName = values["NewName"] as? String else {
                            return
                        }
                        metadata.fileName = newName
                        metadata.fileNameView = newName
                    }
                } else if param["MessageName"] as? String == "hyperlink" {
                    if let values = param["Values"] as? Dictionary<AnyHashable,Any> {
                        guard let urlString = values["Url"] as? String else {
                            return
                        }
                        if let url = URL(string: urlString) {
                            UIApplication.shared.open(url)
                        }
                    }
                }
            }
            
            if message.body as? String == "documentLoaded" {
                print("documentLoaded")
            }
            
            if message.body as? String == "paste" {
                // ?
            }
        }
    }
    
    //MARK: -

    @objc func grabFocus() {
    
        let functionJS = "OCA.RichDocuments.documentsMain.postGrabFocus()"
        webView.evaluateJavaScript(functionJS) { (result, error) in }
    }
    
    //MARK: -
    
    func dismissSelect(serverUrl: String?, metadata: tableMetadata?, type: String, items: [Any], overwrite: Bool, copy: Bool, move: Bool) {
        
        if serverUrl != nil && metadata != nil {
            
            let path = CCUtility.returnFileNamePath(fromFileName: metadata!.fileName, serverUrl: serverUrl!, urlBase: appDelegate.urlBase, account: metadata!.account)!
            
            NCCommunication.shared.createAssetRichdocuments(path: path) { (account, url, errorCode, errorDescription) in
                if errorCode == 0 && account == self.appDelegate.account {
                    let functionJS = "OCA.RichDocuments.documentsMain.postAsset('\(metadata!.fileNameView)', '\(url!)')"
                    self.webView.evaluateJavaScript(functionJS, completionHandler: { (result, error) in })
                } else if errorCode != 0 {
                    NCContentPresenter.shared.messageNotification("_error_", description: errorDescription, delay: NCGlobal.shared.dismissAfterSecond, type: NCContentPresenter.messageType.error, errorCode: NCGlobal.shared.errorInternalError)
                } else {
                    print("[LOG] It has been changed user during networking process, error.")
                }
            }
        }
    }
    
    func select(_ metadata: tableMetadata!, serverUrl: String!) {
        
        let path = CCUtility.returnFileNamePath(fromFileName: metadata!.fileName, serverUrl: serverUrl!, urlBase: appDelegate.urlBase, account: metadata!.account)!
        
        NCCommunication.shared.createAssetRichdocuments(path: path) { (account, url, errorCode, errorDescription) in
            if errorCode == 0 && account == self.appDelegate.account {
                let functionJS = "OCA.RichDocuments.documentsMain.postAsset('\(metadata.fileNameView)', '\(url!)')"
                self.webView.evaluateJavaScript(functionJS, completionHandler: { (result, error) in })
            } else if errorCode != 0 {
                NCContentPresenter.shared.messageNotification("_error_", description: errorDescription, delay: NCGlobal.shared.dismissAfterSecond, type: NCContentPresenter.messageType.error, errorCode: NCGlobal.shared.errorInternalError)
            } else {
                print("[LOG] It has been changed user during networking process, error.")
            }
        }
    }
    
    //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 NCViewerRichdocument : 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])
        }
    }
}
