//
//  NCRichdocument.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 06/09/18.
//  Copyright © 2018 TWS. All rights reserved.
//
//  Author Marino Faggiana <m.faggiana@twsweb.it>
//
//  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 Foundation

class NCRichdocument: NSObject, WKNavigationDelegate, WKScriptMessageHandler {
    
    @objc static let sharedInstance: NCRichdocument = {
        let instance = NCRichdocument()
        return instance
    }()
    
    var webView: WKWebView?
    var request: URLRequest!
    var viewDetail: CCDetail?
    let appDelegate = UIApplication.shared.delegate as! AppDelegate

    @objc func viewRichDocumentAt(_ link: String, viewDetail: CCDetail) {
        
        self.viewDetail = viewDetail
        
        let contentController = WKUserContentController()
        contentController.add(self, name: "RichDocumentsMobileInterface")
        let configuration = WKWebViewConfiguration()
        configuration.userContentController = contentController
        
        webView = WKWebView(frame: viewDetail.view.bounds, configuration: configuration)
        webView?.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        webView?.navigationDelegate = self
        
        self.request = URLRequest(url: URL(string: link)!)
        self.request.addValue("true", forHTTPHeaderField: "OCS-APIRequest")
        let language = NSLocale.preferredLanguages[0] as String
        self.request.addValue(language, forHTTPHeaderField: "Accept-Language")
        
        let userAgent : String = CCUtility.getUserAgent()
        webView!.customUserAgent = userAgent
        webView!.load(self.request!)
        
        viewDetail.view.addSubview(webView!)
    }
    
    public func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) {
        print("WKScriptMessage");
    }
    
    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!) {
        print("didFinish");
    }
}