// 
// Copyright 2020 New Vector Ltd
//
// 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 Foundation

/// InviteFriendsPresenter enables to share current user contact to someone else
@objcMembers
final class InviteFriendsPresenter: NSObject {
    
    // MARK: - Constants
    
    // MARK: - Properties
    
    // MARK: Private
    
    private weak var presentingViewController: UIViewController?
    private weak var sourceView: UIView?
    
    // MARK: - Public
    
    func present(for userId: String,
                 from viewController: UIViewController,
                 sourceView: UIView?,
                 animated: Bool) {
        
        self.presentingViewController = viewController
        self.sourceView = sourceView
        
        self.shareInvite(from: userId)
    }
    
    func dismiss(animated: Bool, completion: (() -> Void)?) {
        self.presentingViewController?.dismiss(animated: animated, completion: completion)
    }
    
    // MARK: - Private
    
    private func shareInvite(from userId: String) {
        
        let shareText = self.buildShareText(with: userId)
        
        // Set up activity view controller
        let activityItems: [Any] = [ shareText ]
        let activityViewController = UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
        
        self.present(activityViewController, animated: true)
    }
    
    private func buildShareText(with userId: String) -> String {
        let userMatrixToLink: String = MXTools.permalinkToUser(withUserId: userId)
        return VectorL10n.inviteFriendsShareText(AppInfo.current.displayName, userMatrixToLink)
    }
    
    private func present(_ viewController: UIViewController, animated: Bool) {
        
        // Configure source view when view controller is presented with a popover
        if let sourceView = self.sourceView, let popoverPresentationController = viewController.popoverPresentationController {
            popoverPresentationController.sourceView = sourceView
            popoverPresentationController.sourceRect = sourceView.bounds
        }
        
        self.presentingViewController?.present(viewController, animated: animated, completion: nil)
        
        Analytics.shared.trackScreen(.inviteFriends, duration: nil)
    }
}