//
//  ViewController.swift
//  BasicTunnel-iOS
//
//  Created by Davide De Rosa on 2/11/17.
//  Copyright (c) 2018 Davide De Rosa. All rights reserved.
//
//  https://github.com/keeshux
//
//  This file is part of TunnelKit.
//
//  TunnelKit 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.
//
//  TunnelKit 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 TunnelKit.  If not, see <http://www.gnu.org/licenses/>.
//
//  This file incorporates work covered by the following copyright and
//  permission notice:
//
//      Copyright (c) 2018-Present Private Internet Access
//
//      Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
//
//      The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
//      THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//

import UIKit
import TunnelKit

private let appGroup = "group.com.algoritmico.ios.demo.BasicTunnel"

private let tunnelIdentifier = "com.algoritmico.ios.demo.BasicTunnel.Extension"

private let ca = OpenVPN.CryptoContainer(pem: """
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
""")

private let clientCertificate = OpenVPN.CryptoContainer(pem: """
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
""")

private let clientKey = OpenVPN.CryptoContainer(pem: """
-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
""")

extension ViewController {
    private func makeConfiguration() -> OpenVPNTunnelProvider.Configuration {
        let server = textServer.text!
        let domain = textDomain.text!
        
        let hostname = ((domain == "") ? server : [server, domain].joined(separator: "."))
        let port = UInt16(textPort.text!)!

        var sessionBuilder = OpenVPN.ConfigurationBuilder()
        sessionBuilder.ca = ca
        sessionBuilder.cipher = .aes128cbc
        sessionBuilder.digest = .sha1
        sessionBuilder.compressionFraming = .compLZO
        sessionBuilder.renegotiatesAfter = nil
        sessionBuilder.hostname = hostname
        let socketType: SocketType = switchTCP.isOn ? .tcp : .udp
        sessionBuilder.endpointProtocols = [EndpointProtocol(socketType, port)]
        sessionBuilder.clientCertificate = clientCertificate
        sessionBuilder.clientKey = clientKey
        var builder = OpenVPNTunnelProvider.ConfigurationBuilder(sessionConfiguration: sessionBuilder.build())
        builder.mtu = 1350
        builder.shouldDebug = true
        builder.masksPrivateData = false
        
        return builder.build()
    }
}

class ViewController: UIViewController, URLSessionDataDelegate {
    @IBOutlet var textUsername: UITextField!
    
    @IBOutlet var textPassword: UITextField!
    
    @IBOutlet var textServer: UITextField!
    
    @IBOutlet var textDomain: UITextField!
    
    @IBOutlet var textPort: UITextField!
    
    @IBOutlet var switchTCP: UISwitch!
    
    @IBOutlet var buttonConnection: UIButton!

    @IBOutlet var textLog: UITextView!

    //
    
    let vpn = StandardVPNProvider(bundleIdentifier: tunnelIdentifier)
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        textServer.text = "es"
        textDomain.text = "lazerpenguin.com"
        textPort.text = "443"
        switchTCP.isOn = false
        textUsername.text = ""
        textPassword.text = ""
        
        NotificationCenter.default.addObserver(
            self,
            selector: #selector(VPNStatusDidChange(notification:)),
            name: .VPNDidChangeStatus,
            object: nil
        )
        
        vpn.prepare(completionHandler: nil)

        //
        
        testFetchRef()
    }
    
    @IBAction func connectionClicked(_ sender: Any) {
        switch vpn.status {
        case .disconnected:
            connect()
            
        case .connected, .connecting, .disconnecting:
            disconnect()
        }
    }
    
    @IBAction func tcpClicked(_ sender: Any) {
    }
    
    func connect() {
        let credentials = OpenVPN.Credentials(textUsername.text!, textPassword.text!)
        let proto = try! makeConfiguration().generatedTunnelProtocol(
            withBundleIdentifier: tunnelIdentifier,
            appGroup: appGroup,
            credentials: credentials
        )
        let cfg = NetworkExtensionVPNConfiguration(protocolConfiguration: proto, onDemandRules: [])
        vpn.reconnect(configuration: cfg) { (error) in
            if let error = error {
                print("configure error: \(error)")
                return
            }
        }
    }
    
    func disconnect() {
        vpn.disconnect(completionHandler: nil)
    }

    @IBAction func displayLog() {
        vpn.requestDebugLog(fallback: { "" }) { (log) in
            self.textLog.text = log
        }
    }
    
    func updateButton() {
        switch vpn.status {
        case .connected, .connecting:
            buttonConnection.setTitle("Disconnect", for: .normal)
            
        case .disconnected:
            buttonConnection.setTitle("Connect", for: .normal)
            
        case .disconnecting:
            buttonConnection.setTitle("Disconnecting", for: .normal)
        }
    }
    
    @objc private func VPNStatusDidChange(notification: NSNotification) {
        print("VPNStatusDidChange: \(vpn.status)")
        updateButton()
    }
    
    private func testFetchRef() {
//        let keychain = Keychain(group: ViewController.APP_GROUP)
//        let username = "foo"
//        let password = "bar"
//        
//        guard let _ = try? keychain.set(password: password, for: username) else {
//            print("Couldn't set password")
//            return
//        }
//        guard let passwordReference = try? keychain.passwordReference(for: username) else {
//            print("Couldn't get password reference")
//            return
//        }
//        guard let fetchedPassword = try? Keychain.password(for: username, reference: passwordReference) else {
//            print("Couldn't fetch password")
//            return
//        }
//
//        print("\(username) -> \(password)")
//        print("\(username) -> \(fetchedPassword)")
    }
}