ScheduleViewController.swift

//
//  FirstViewController.swift
//  FOSSAsia
//
//  Created by Jurvis Tan on 29/1/16.
//  Copyright © 2016 FossAsia. All rights reserved.
//

import UIKit
import MGSwipeTableCell

class ScheduleViewController: EventsBaseViewController, SwipeToFavoriteCellPresentable, TableViewRefreshable {
    var refreshControl : UIRefreshControl!

    // Constants for Storyboard/VC
    struct StoryboardConstants {
        static let storyboardName = "ScheduleVC"
        static let viewControllerId = String(describing: ScheduleViewController.self)
    }

    lazy var filteredEvents: [EventViewModel] = self.allEvents
    var filterString: String? = nil {
        didSet {
            if filterString == nil || filterString!.isEmpty {
                filteredEvents = self.allEvents
            } else {
                let filterPredicate = NSPredicate(format: "self contains[c] %@", argumentArray: [filterString!])
                filteredEvents = allEvents.filter({filterPredicate.evaluate(with: $0.eventName) })
            }
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        viewModel?.delegate = self
        DispatchQueue.main.async {
            self.refreshControl = UIRefreshControl()
            self.refreshControl.attributedTitle = NSAttributedString(string: "Pull to refresh")
            self.refreshControl.addTarget(self, action: #selector(ScheduleViewController.refreshData(_:)), for: .valueChanged)
            self.tableView.addSubview(self.refreshControl)
        }
    }

    class func scheduleViewControllerFor(_ schedule: ScheduleViewModel) -> ScheduleViewController {
        let storyboard = UIStoryboard(name: ScheduleViewController.StoryboardConstants.storyboardName, bundle: nil)

        let viewController = storyboard.instantiateViewController(withIdentifier: ScheduleViewController.StoryboardConstants.viewControllerId) as! ScheduleViewController
        viewController.viewModel = schedule

        return viewController
    }

    @objc func refreshData(_ sender: AnyObject) {
        viewModel?.refresh()
    }
}

extension ScheduleViewController: UISearchResultsUpdating {
    func updateSearchResults(for searchController: UISearchController) {
        guard searchController.isActive else {
            return
        }
        filterString = searchController.searchBar.text
    }
}

extension ScheduleViewController {
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: EventsBaseViewController.kEventCellReuseIdentifier, for: indexPath) as! EventCell
        let eventViewModel = allEvents[(indexPath as NSIndexPath).row]
        cell.configure(withPresenter: eventViewModel)
        cell.delegate = self

        return cell
    }
}

// MARK: - SwipeToFavoriteCellPresentable Conformance
extension ScheduleViewController {
    func favoriteEvent(_ indexPath: IndexPath) {
        weak var me = self
        let eventViewModel = me!.eventViewModelForIndexPath(indexPath)
        eventViewModel.favoriteEvent { (eventViewModel, error) -> Void in
            if error == nil {
                self.tableView.reloadData()
            }
        }
    }

    func swipeTableCell(_ cell: MGSwipeTableCell!, swipeButtonsFor direction: MGSwipeDirection, swipeSettings: MGSwipeSettings!, expansionSettings: MGSwipeExpansionSettings!) -> [AnyObject]! {
        swipeSettings.transition = .border
        expansionSettings.buttonIndex = 0

        weak var me = self
        let eventViewModel = me!.eventViewModelForIndexPath(me!.tableView.indexPath(for: cell)!)

        if direction == .leftToRight {
            expansionSettings.fillOnTrigger = false
            expansionSettings.threshold = 2

            let faveButton = MGSwipeButton(title: "", icon: (eventViewModel.isFavorite ? UIImage(named: "cell_favorite_selected") : UIImage(named: "cell_favorite")), backgroundColor: Colors.favoriteOrangeColor!) { (sender: MGSwipeTableCell!) -> Bool in
                if let sessionCell = sender as? EventCell {
                    UIView.animate(withDuration: 0.3, animations: { () -> Void in
                        if (eventViewModel.isFavorite) {
                            sessionCell.favoriteImage.transform = CGAffineTransform(scaleX: 0.1, y: 0.1)
                            sessionCell.favoriteImage.alpha = 0.0
                        } else {
                            sessionCell.favoriteImage.transform = CGAffineTransform.identity
                            sessionCell.favoriteImage.alpha = 1.0
                        }
                        }, completion: { (done) -> Void in
                            if done {
                                self.favoriteEvent(me!.tableView.indexPath(for: cell)!)
                            }
                    })
                }
                return true
            }

            faveButton.setPadding(CGFloat(20))
            cell.leftButtons = [faveButton]

            return [faveButton]
        }
        return nil
    }
}