FlickrPhotosViewController

//
//  FlickerPhotosViewController.swift
//  MyFlicker1
//
//  Created by דקל איפרגן on 10/01/2019.
//  Copyright © 2019 Dekel. All rights reserved.
//

import UIKit



class FlickerPhotosViewController: UICollectionViewController {

    private let reuseIdentifier = "FlickerCell"
    private let sectionInset = UIEdgeInsets(top: 50.0, left: 20.0, bottom: 50.0, right: 20.0)
    private var searches:[FlickrSearchResults] = []
    private let flickr = Flickr()


    override func viewDidLoad() {
        super.viewDidLoad()

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Register cell classes
        self.collectionView!.register(UICollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)

        // Do any additional setup after loading the view.
    }

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using [segue destinationViewController].
        // Pass the selected object to the new view controller.
    }
    */

    // MARK: UICollectionViewDataSource

    override func numberOfSections(in collectionView: UICollectionView) -> Int {

        return searches.count
    }


    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

        return searches[section].searchResults.count
    }

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath)

        // Configure the cell
        cell.backgroundColor = .black
        return cell
    }

    // MARK: UICollectionViewDelegate

    /*
    // Uncomment this method to specify if the specified item should be highlighted during tracking
    override func collectionView(_ collectionView: UICollectionView, shouldHighlightItemAt indexPath: IndexPath) -> Bool {
        return true
    }
    */

    /*
    // Uncomment this method to specify if the specified item should be selected
    override func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
        return true
    }
    */

    /*
    // Uncomment these methods to specify if an action menu should be displayed for the specified item, and react to actions performed on the item
    override func collectionView(_ collectionView: UICollectionView, shouldShowMenuForItemAt indexPath: IndexPath) -> Bool {
        return false
    }

    override func collectionView(_ collectionView: UICollectionView, canPerformAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) -> Bool {
        return false
    }

    override func collectionView(_ collectionView: UICollectionView, performAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) {

    }
    */

}



private extension FlickerPhotosViewController{
    func photo(for indexPath: IndexPath) -> FlickrPhoto{
        return searches[indexPath.section].searchResults[indexPath.row]
    }
}

extension FlickerPhotosViewController : UITextFieldDelegate {
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        //1
        let activityIndicator = UIActivityIndicatorView(style: .gray)
        activityIndicator.frame = textField.bounds
        activityIndicator.startAnimating()

        flickr.searchFlickr(for: textField.text!){
            searchResults in
            activityIndicator.removeFromSuperview()

            switch searchResults{
            case .error(let error):
                //2
                print("error searching: \(error)")
                //3
            case .results(let results):
                print("found \(results.searchResults.count) matching \(results.searchTerm)")
                self.searches.insert(results, at: 0)
                //4
                self.collectionView?.reloadData()

            }
        }
        textField.text = nil
        textField.resignFirstResponder()
        return true
    }
}