// MIT License
//
// Copyright (c) 2017-2019 MessageKit
//
// 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.
//
// 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

/// An object is responsible for
/// sizing and configuring cells for given `IndexPath`s.
open class CellSizeCalculator {
  // MARK: Lifecycle

  public init() { }

  // MARK: Open

  /// Used to configure the layout attributes for a given cell.
  ///
  /// - Parameters:
  /// - attributes: The attributes of the cell.
  /// The default does nothing
  open func configure(attributes _: UICollectionViewLayoutAttributes) { }

  /// Used to size an item at a given `IndexPath`.
  ///
  /// - Parameters:
  /// - indexPath: The `IndexPath` of the item to be displayed.
  /// The default return .zero
  open func sizeForItem(at _: IndexPath) -> CGSize { .zero }

  // MARK: Public

  /// The layout object for which the cell size calculator is used.
  public weak var layout: UICollectionViewFlowLayout?
}
