//
//  SkeletonCollectionViewProtocols.swift
//  SkeletonView-iOS
//
//  Created by Juanpe Catalán on 06/11/2017.
//  Copyright © 2017 SkeletonView. All rights reserved.
//

import UIKit

public protocol SkeletonCollectionViewDataSource: UICollectionViewDataSource {
    func numSections(in collectionSkeletonView: UICollectionView) -> Int
    func collectionSkeletonView(_ skeletonView: UICollectionView, numberOfItemsInSection section: Int) -> Int
    func collectionSkeletonView(_ skeletonView: UICollectionView, cellIdentifierForItemAt indexPath: IndexPath) -> ReusableCellIdentifier
    func collectionSkeletonView(_ skeletonView: UICollectionView, supplementaryViewIdentifierOfKind: String, at indexPath: IndexPath) -> ReusableCellIdentifier?
    func collectionSkeletonView(_ skeletonView: UICollectionView, skeletonCellForItemAt indexPath: IndexPath) -> UICollectionViewCell?
    func collectionSkeletonView(_ skeletonView: UICollectionView, prepareCellForSkeleton cell: UICollectionViewCell, at indexPath: IndexPath)
    func collectionSkeletonView(_ skeletonView: UICollectionView, prepareViewForSkeleton view: UICollectionReusableView, at indexPath: IndexPath)
}

public extension SkeletonCollectionViewDataSource {
    func collectionSkeletonView(_ skeletonView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        UICollectionView.automaticNumberOfSkeletonItems
    }
    
    func collectionSkeletonView(_ skeletonView: UICollectionView, supplementaryViewIdentifierOfKind: String, at indexPath: IndexPath) -> ReusableCellIdentifier? {
        nil
    }
    
    func numSections(in collectionSkeletonView: UICollectionView) -> Int {
        1
    }
    
    func collectionSkeletonView(_ skeletonView: UICollectionView, skeletonCellForItemAt indexPath: IndexPath) -> UICollectionViewCell? {
        nil
    }

    func collectionSkeletonView(_ skeletonView: UICollectionView, prepareCellForSkeleton cell: UICollectionViewCell, at indexPath: IndexPath) { }

    func collectionSkeletonView(_ skeletonView: UICollectionView, prepareViewForSkeleton view: UICollectionReusableView, at indexPath: IndexPath) { }
}

public protocol SkeletonCollectionViewDelegate: UICollectionViewDelegate { }