element-ios/Riot/Modules/Room/CreationModal/RoomCreationEventsModal/RoomCreationEventsModalViewController.swift

// File created from ScreenTemplate
// $ createScreen.sh Modal2/RoomCreation RoomCreationEventsModal
/*
 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 UIKit

final class RoomCreationEventsModalViewController: UIViewController {
    
    // MARK: - Constants
    
    private enum Constants {
        static let defaultStyleCellReuseIdentifier = "default"
    }
    
    // MARK: - Properties
    
    // MARK: Outlets

    @IBOutlet private weak var mainTableView: UITableView!
    @IBOutlet private weak var roomAvatarImageView: MXKImageView! {
        didSet {
            roomAvatarImageView.layer.cornerRadius = roomAvatarImageView.frame.width/2
        }
    }
    @IBOutlet private weak var roomNameLabel: UILabel!
    @IBOutlet private weak var roomInfoLabel: UILabel!
    @IBOutlet private weak var closeButton: UIButton!
    
    // MARK: Private

    private var viewModel: RoomCreationEventsModalViewModelType!
    private var theme: Theme!
    private var errorPresenter: MXKErrorPresentation!
    private var activityPresenter: ActivityIndicatorPresenter!

    // MARK: - Setup
    
    class func instantiate(with viewModel: RoomCreationEventsModalViewModelType) -> RoomCreationEventsModalViewController {
        let viewController = StoryboardScene.RoomCreationEventsModalViewController.initialScene.instantiate()
        viewController.viewModel = viewModel
        viewController.theme = ThemeService.shared().theme
        return viewController
    }
    
    // MARK: - Life cycle
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // Do any additional setup after loading the view.
        
        self.setupViews()
        self.activityPresenter = ActivityIndicatorPresenter()
        self.errorPresenter = MXKErrorAlertPresentation()
        
        self.registerThemeServiceDidChangeThemeNotification()
        self.update(theme: self.theme)
        
        self.viewModel.viewDelegate = self

        self.viewModel.process(viewAction: .loadData)
        
        roomNameLabel.text = viewModel.roomName
        roomInfoLabel.text = viewModel.roomInfo
        viewModel.setAvatar(in: roomAvatarImageView)
    }

    override var preferredStatusBarStyle: UIStatusBarStyle {
        return self.theme.statusBarStyle
    }
    
    // MARK: - Private
    
    private func update(theme: Theme) {
        self.theme = theme
        
        self.view.backgroundColor = theme.backgroundColor
        self.mainTableView.backgroundColor = theme.backgroundColor
        
        if let navigationBar = self.navigationController?.navigationBar {
            theme.applyStyle(onNavigationBar: navigationBar)
        }

        // TODO: Set view colors here
        theme.applyStyle(onButton: self.closeButton)
        
        roomNameLabel.textColor = theme.textPrimaryColor
        roomInfoLabel.textColor = theme.textSecondaryColor
        
        self.mainTableView.reloadData()
    }
    
    private func registerThemeServiceDidChangeThemeNotification() {
        NotificationCenter.default.addObserver(self, selector: #selector(themeDidChange), name: .themeServiceDidChangeTheme, object: nil)
    }
    
    @objc private func themeDidChange() {
        self.update(theme: ThemeService.shared().theme)
    }
    
    private func setupViews() {
        self.mainTableView.separatorStyle = .none
        self.mainTableView.tableFooterView = UIView()
    }

    private func render(viewState: RoomCreationEventsModalViewState) {
        switch viewState {
        case .loading:
            self.renderLoading()
        case .loaded:
            self.renderLoaded()
        case .error(let error):
            self.render(error: error)
        }
    }
    
    private func renderLoading() {
//        self.activityPresenter.presentActivityIndicator(on: self.view, animated: true)
    }
    
    private func renderLoaded() {
        self.activityPresenter.removeCurrentActivityIndicator(animated: true)

    }
    
    private func render(error: Error) {
        self.activityPresenter.removeCurrentActivityIndicator(animated: true)
        self.errorPresenter.presentError(from: self, forError: error, animated: true, handler: nil)
    }

    // MARK: - Actions

    @IBAction private func closeButtonTapped(_ sender: Any) {
        self.viewModel.process(viewAction: .close)
    }

}


// MARK: - RoomCreationEventsModalViewModelViewDelegate

extension RoomCreationEventsModalViewController: RoomCreationEventsModalViewModelViewDelegate {

    func roomCreationEventsModalViewModel(_ viewModel: RoomCreationEventsModalViewModelType, didUpdateViewState viewSate: RoomCreationEventsModalViewState) {
        self.render(viewState: viewSate)
    }
}

// MARK: - SlidingModalPresentable

extension RoomCreationEventsModalViewController: SlidingModalPresentable {
    
    func allowsDismissOnBackgroundTap() -> Bool {
        return true
    }
    
    func layoutHeightFittingWidth(_ width: CGFloat) -> CGFloat {
        return mainTableView.contentSize.height + 80
        // TODO: Fix hard-coded
//        return 500
    }
    
}

// MARK: - UITableViewDataSource

extension RoomCreationEventsModalViewController: UITableViewDataSource {
    
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return viewModel.numberOfRows
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let viewModel = viewModel.rowViewModel(at: indexPath) else {
            return UITableViewCell(style: .default, reuseIdentifier: nil)
        }
        
        var cell: UITableViewCell! = tableView.dequeueReusableCell(withIdentifier: Constants.defaultStyleCellReuseIdentifier)
        if cell == nil {
            cell = UITableViewCell(style: .default, reuseIdentifier: Constants.defaultStyleCellReuseIdentifier)
        }
        if let title = viewModel.title {
            let mutableTitle = NSMutableAttributedString(attributedString: title)
            mutableTitle.setAttributes([
                NSAttributedString.Key.font: UIFont.systemFont(ofSize: 16),
                NSAttributedString.Key.foregroundColor: theme.textSecondaryColor
            ], range: NSRange(location: 0, length: mutableTitle.length))
            cell.textLabel?.attributedText = mutableTitle
        } else {
            cell.textLabel?.attributedText = nil
        }
        
        cell.textLabel?.numberOfLines = 0
        cell.backgroundColor = theme.backgroundColor
        cell.contentView.backgroundColor = .clear
        cell.tintColor = theme.tintColor
        cell.selectionStyle = .none
        return cell
    }
    
}

// MARK: - UITableViewDelegate

extension RoomCreationEventsModalViewController: UITableViewDelegate {
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        
    }
    
}