CategoryCell.swift

//
//  CategoryCell.swift
//  AppStore
//
//  Created by Tihomir Videnov on 11/6/16.
//  Copyright © 2016 Tihomir Videnov. All rights reserved.
//

import UIKit

class CategoryCell: UICollectionViewCell, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
    
    var appCategory: AppCategory? {
        didSet {
            if let name = appCategory?.name {
                nameLabel.text = name
            }
            appsCollectionView.reloadData()
        }
    }
    var featuredAppsController: FeaturedAppsController?
    
    fileprivate let cellId = "cellId"

    override init(frame: CGRect){
        super.init(frame: frame)
        setupViews()
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    let nameLabel: UILabel = {
        let label = UILabel()
        //label.text = "Best New Apps"
        label.font = UIFont.systemFont(ofSize: 16)
        label.translatesAutoresizingMaskIntoConstraints = false
        return label
    }()
    
    let appsCollectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .horizontal
        let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
        collectionView.backgroundColor = .clear
        collectionView.translatesAutoresizingMaskIntoConstraints = false
        return collectionView
    }()
    
    let dividerLine: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(white: 0.4, alpha: 0.4)
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()
    
    func setupViews() {
        
        backgroundColor = .clear
        
        addSubview(appsCollectionView)
        addSubview(dividerLine)
        addSubview(nameLabel)
        
        appsCollectionView.dataSource = self
        appsCollectionView.delegate = self
        
        appsCollectionView.register(AppCell.self, forCellWithReuseIdentifier: cellId)
        
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-14-[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": nameLabel]))
        
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": appsCollectionView]))
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[nameLabel(30)][v0][v1(0.5)]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": appsCollectionView, "v1": dividerLine, "nameLabel": nameLabel]))
        
        
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-14-[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": dividerLine]))
        
        
    }
    
    //MARK:- CollectionView functions
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        if let count = appCategory?.apps?.count {
        return count
        }
        return 0
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! AppCell
        cell.app = appCategory?.apps?[indexPath.row]
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: 100, height: frame.height - 32)
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        return UIEdgeInsetsMake(0, 14, 0, 14)
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        if let app = appCategory?.apps?[indexPath.item] {
        featuredAppsController?.showAppDetailFor(app: app)
        }
 
    }
    
}