//
/*
 * Copyright (c) 2022 BWI GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import SwiftUI
import UIKit


class PermalinkQRCodeScannerController: NSObject {
    
  @objc static func createFromSwiftUIView() -> UIViewController {
    return UIHostingController(rootView: PermalinkQRCodeScanner())
  }
    
}

struct PermalinkQRCodeScanner: View {
    @Environment(\.presentationMode) var presentationMode
    @State var qrCode: String = ""
    @State var scanCompleted = false
    @State var showInvalidCodeAlert = false
    
    var body: some View {
        NavigationView {
            ScannerView(qrCode: $qrCode, scanCompleted: $scanCompleted)
                .navigationTitle(BWIL10n.roomRecentsScanQrCode)
                .navigationBarTitleDisplayMode(.inline)
                .toolbar {
                    ToolbarItem(placement: .navigationBarLeading) {
                        Button {
                            presentationMode.wrappedValue.dismiss()
                        } label: {
                            Text(VectorL10n.close)
                                .foregroundColor(Color(ThemeService.shared().theme.tintColor))
                        }
                    }
                }
                .alert(isPresented: $showInvalidCodeAlert) {
                    Alert(
                        title: Text(BWIL10n.roomRecentsScanFailedTitle),
                        message: Text(BWIL10n.roomRecentsScanFailedMessage),
                        dismissButton: .default(Text(VectorL10n.ok)) {
                            DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
                                presentationMode.wrappedValue.dismiss()
                            }
                        }
                    )
                }
        }
        .onChange(of: scanCompleted) { newValue in
            if newValue {
                checkQRCode()
            }
        }
    }
    
    private func checkQRCode() {
        let permalinkURL = AppConfigService.shared.permalinkUrl() ?? BWIBuildSettings.shared.clientPermalinkBaseUrl
        if !permalinkURL.isEmpty && qrCode.hasPrefix(permalinkURL) {
            presentationMode.wrappedValue.dismiss()
            DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
                if let url = NSURLComponents(string: qrCode)?.url {
                    AppDelegate.theDelegate().handleUniversalLinkURL(url)
                }
            }
        } else {
            showInvalidCodeAlert = true
        }
    }

}