SideStore/AltStore/Settings/PatreonViewController.swift

//
//  PatreonViewController.swift
//  AltStore
//
//  Created by Riley Testut on 9/5/19.
//  Copyright © 2019 Riley Testut. All rights reserved.
//

import UIKit
import SafariServices
import AuthenticationServices

import AltStoreCore
import Roxas

final class PatreonViewController: UICollectionViewController
{
    private var prototypeAboutHeader: AboutPatreonHeaderView!
    
    override func viewDidLoad()
    {
        super.viewDidLoad()
        
        let aboutHeaderNib = UINib(nibName: "AboutPatreonHeaderView", bundle: nil)
        self.prototypeAboutHeader = aboutHeaderNib.instantiate(withOwner: nil, options: nil)[0] as? AboutPatreonHeaderView
        
        self.collectionView.register(aboutHeaderNib, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: "AboutHeader")
        self.collectionView.reloadData()
    }
    
    override func viewWillAppear(_ animated: Bool)
    {
        super.viewWillAppear(animated)
        self.collectionView.reloadData()
    }
    
    override func viewDidLayoutSubviews()
    {
        super.viewDidLayoutSubviews()
        
        let layout = self.collectionViewLayout as! UICollectionViewFlowLayout
        
        var itemWidth = (self.collectionView.bounds.width - (layout.sectionInset.left + layout.sectionInset.right + layout.minimumInteritemSpacing)) / 2
        itemWidth.round(.down)
        
        // TODO: if the intention here is to hide the cells, we should just modify the data source. @JoeMatt
        layout.itemSize = CGSize(width: 0, height: 0)
    }
}

private extension PatreonViewController
{
    func prepare(_ headerView: AboutPatreonHeaderView)
    {
        headerView.layoutMargins = self.view.layoutMargins
        headerView.supportButton.addTarget(self, action: #selector(PatreonViewController.openPatreonURL(_:)), for: .primaryActionTriggered)
        headerView.twitterButton.addTarget(self, action: #selector(PatreonViewController.openTwitterURL(_:)), for: .primaryActionTriggered)
        headerView.instagramButton.addTarget(self, action: #selector(PatreonViewController.openInstagramURL(_:)), for: .primaryActionTriggered)
    }
}

private extension PatreonViewController
{
    @objc func openPatreonURL(_ sender: UIButton)
    {
        let patreonURL = URL(string: "https://www.patreon.com/SideStoreIO")!
        
        let safariViewController = SFSafariViewController(url: patreonURL)
        safariViewController.preferredControlTintColor = self.view.tintColor
        self.present(safariViewController, animated: true, completion: nil)
    }
    
    @objc func openTwitterURL(_ sender: UIButton)
    {
        let twitterURL = URL(string: "https://twitter.com/sidestoreio")!
        
        let safariViewController = SFSafariViewController(url: twitterURL)
        safariViewController.preferredControlTintColor = self.view.tintColor
        self.present(safariViewController, animated: true, completion: nil)
    }
    
    @objc func openInstagramURL(_ sender: UIButton)
    {
        let twitterURL = URL(string: "https://instagram.com/sidestore.io")!
        
        let safariViewController = SFSafariViewController(url: twitterURL)
        safariViewController.preferredControlTintColor = self.view.tintColor
        self.present(safariViewController, animated: true, completion: nil)
    }
}

extension PatreonViewController
{
    override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView
    {
        let headerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "AboutHeader", for: indexPath) as! AboutPatreonHeaderView
        self.prepare(headerView)
        return headerView
    }
}

extension PatreonViewController: UICollectionViewDelegateFlowLayout
{
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize
    {
        let widthConstraint = self.prototypeAboutHeader.widthAnchor.constraint(equalToConstant: collectionView.bounds.width)
        NSLayoutConstraint.activate([widthConstraint])
        defer { NSLayoutConstraint.deactivate([widthConstraint]) }
        
        self.prepare(self.prototypeAboutHeader)
        return self.prototypeAboutHeader.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
    }
}