/// Copyright (c) 2020 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import UIKit
import Alamofire

public class PickFlavorViewController: UIViewController {
  // MARK: - Instance Properties
  public var flavors: [Flavor] = []
  private let flavorFactory = FlavorFactory()

  // MARK: - Outlets
  @IBOutlet var contentView: UIView!
  @IBOutlet var collectionView: UICollectionView!
  @IBOutlet var iceCreamView: IceCreamView!
  @IBOutlet var label: UILabel!

  // MARK: - View Lifecycle
  public override func viewDidLoad() {
    super.viewDidLoad()

    loadFlavors()
  }

  private func loadFlavors() {
    // TO-DO: Implement this
    //get request and download a plist 
    Alamofire.request("https://www.raywenderlich.com/downloads/Flavors.plist",
                      method: .get,
                      encoding: PropertyListEncoding(format: .xml, options: 0))
      .responsePropertyList { [weak self] response in
        
        guard let self = self else { return }
        
        guard response.result.isSuccess,
          let dictionaryArray = response.result.value as? [[String:String]]
          else {
            return
        }
        self.flavors = self.flavorFactory.flavors(from: dictionaryArray)
        
        self.collectionView.reloadData()
        self.selectFirstFlavor()
    }
  }

  private func selectFirstFlavor() {
    guard let flavor = flavors.first else {
      return
    }
    update(with: flavor)
  }
}

// MARK: - FlavorAdapter
extension PickFlavorViewController: FlavorAdapter {
  public func update(with flavor: Flavor) {
    iceCreamView.update(with: flavor)
    label.text = flavor.name
  }
}

// MARK: - UICollectionViewDataSource
extension PickFlavorViewController: UICollectionViewDataSource {
  private struct CellIdentifiers {
    static let scoop = "ScoopCell"
  }

  public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return flavors.count
  }

  public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: CellIdentifiers.scoop, for: indexPath) as! ScoopCell
    let flavor = flavors[indexPath.row]
    cell.update(with: flavor)
    return cell
  }
}

// MARK: - UICollectionViewDelegate
extension PickFlavorViewController: UICollectionViewDelegate {
  public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let flavor = flavors[indexPath.row]
    update(with: flavor)
  }
}
