// 
// Copyright 2021 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


class SpaceMenuViewController: UIViewController {
    
    // MARK: - Constants
    
    private enum Constants {
        static let estimatedRowHeight: CGFloat = 64.0
    }
    
    // MARK: Private

    private var theme: Theme!
    private var session: MXSession!
    private var spaceId: String!
    private var viewModel: SpaceMenuViewModelType!
    
    // MARK: Outlets

    @IBOutlet private weak var avatarView: SpaceAvatarView!
    @IBOutlet private weak var titleLabel: UILabel!
    @IBOutlet private weak var subtitleLabel: UILabel!
    @IBOutlet private weak var closeButton: UIButton!
    @IBOutlet private weak var tableView: UITableView!

    // MARK: - Setup
    
    class func instantiate(forSpaceWithId spaceId: String, matrixSession: MXSession, viewModel: SpaceMenuViewModelType!) -> SpaceMenuViewController {
        let viewController = StoryboardScene.SpaceMenuViewController.initialScene.instantiate()
        viewController.session = matrixSession
        viewController.spaceId = spaceId
        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.registerThemeServiceDidChangeThemeNotification()
        self.update(theme: self.theme)
    }
    
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return self.theme.statusBarStyle
    }
    
    override var preferredContentSize: CGSize {
        get {
            return CGSize(width: 300, height: 300)
        }
        set {
            super.preferredContentSize = newValue
        }
    }
    
    // MARK: - IBActions
    
    @IBAction private func closeAction(sender: UIButton) {
        self.viewModel.process(viewAction: .dismiss)
    }
    
    // MARK: - Private
    
    private func update(theme: Theme) {
        self.theme = theme
        
        self.view.backgroundColor = theme.colors.background
        
        self.titleLabel.textColor = theme.colors.primaryContent
        self.titleLabel.font = theme.fonts.title3SB
        self.subtitleLabel.textColor = theme.colors.secondaryContent
        self.subtitleLabel.font = theme.fonts.caption1
        self.closeButton.backgroundColor = theme.roomInputTextBorder
        self.closeButton.tintColor = theme.noticeSecondaryColor
    }
    
    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() {
        guard let space = self.session.spaceService.getSpace(withId: self.spaceId), let summary = space.summary else {
            MXLog.error("[SpaceMenuViewController] setupViews: no space found")
            return
        }
        
        let avatarViewData = AvatarViewData(avatarUrl: summary.avatar, mediaManager: self.session.mediaManager, fallbackImage: .matrixItem(summary.roomId, summary.displayname))

        self.titleLabel.text = space.summary?.displayname
        // TODO: display members instead once done on android
//        self.subtitleLabel.text = space.membersId.count == 1 ? VectorL10n.roomTitleOneMember :
//            VectorL10n.roomTitleMembers("\(space.membersId.count)")
        self.subtitleLabel.text = summary.topic
        self.avatarView.fill(with: avatarViewData)
        
        self.closeButton.layer.masksToBounds = true
        self.closeButton.layer.cornerRadius = self.closeButton.bounds.height / 2
        setupTableView()
    }
    
    private func setupTableView() {
        self.tableView.separatorStyle = .none
        self.tableView.rowHeight = UITableView.automaticDimension
        self.tableView.estimatedRowHeight = Constants.estimatedRowHeight
        self.tableView.allowsSelection = true
        self.tableView.register(cellType: SpaceMenuListViewCell.self)
        self.tableView.tableFooterView = UIView()
    }
}

// MARK: - SlidingModalPresentable

extension SpaceMenuViewController: SlidingModalPresentable {
    
    func allowsDismissOnBackgroundTap() -> Bool {
        return true
    }
    
    func layoutHeightFittingWidth(_ width: CGFloat) -> CGFloat {
        return 300
    }
    
}

// MARK: - UITableViewDataSource

extension SpaceMenuViewController: UITableViewDataSource {
    
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return viewModel.menuItems.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(for: indexPath, cellType: SpaceMenuListViewCell.self)
        
        let viewData = viewModel.menuItems[indexPath.row]
        
        cell.update(theme: self.theme)
        cell.fill(with: viewData)
        
        return cell
    }
}

// MARK: - UITableViewDelegate
extension SpaceMenuViewController: UITableViewDelegate {
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        self.viewModel.process(viewAction: .selectRow(at: indexPath))
    }
}