TaskListViewController.swift

import UIKit

final class TaskListViewController: UIViewController, InfoPresenterProtocol, ActivityIndicatorProtocol {

    @IBOutlet weak var collectionView: UICollectionView!
    var model: TaskListModelInput!
    var imagePicker: ImagePickerInput!
    private var collectionDataSource: TaskListCollectionViewDataSource!
    private var selectedTask: TaskDataType?
    
    override func viewDidLoad() {
        super.viewDidLoad()

        collectionDataSource = TaskListCollectionViewDataSource(view: collectionView, controller: self, card: model.card)
        collectionView.collectionViewLayout = TaskListCollectionViewFlowLayout()
        collectionView.reloadData()
    }

    // MARK: - Navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {}
    
    @IBAction func unwind(segue: UIStoryboardSegue) {}

}

// MARK: - TaskListModelOutput
extension TaskListViewController: TaskListModelOutput {
    
    func didUpdate(task: TaskDataType) {
        selectedTask = nil
        hideActivityIndicator()
        show(title: "Task did update", message: "\(task)")
    }
    
}

// MARK: - TaskListViewControllerInput
extension TaskListViewController: TaskListViewControllerInput {
    
    func imagePickerDidFinish(with image: UIImage?) {
        guard let `image` = image,
            let data = UIImageJPEGRepresentation(image, 1.0),
            let task = selectedTask else { return }
        showActivityIndicator()
        model.upload(image: data, for: task)
    }
    
    func startTask() {
        show(error: "Start task")
    }
    
    func doLaterTask() {
        collectionDataSource.showTask = false
        collectionView.performBatchUpdates({
            collectionView.deleteItems(at: [IndexPath(item: 0, section: TaskListSection.description.rawValue)])
        }, completion: nil)
    }
    
    func didSelect(task: TaskDataType) {
        selectedTask = task
        
        imagePicker.show(on: self)
    }
    
}