//
//  CollectionViewStackCell.swift
//  NavigationStackDemo
//
// Copyright (c) 26/02/16 Ramotion Inc. (http://ramotion.com)
//
// 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

// MARK: CollectionViewStackCell

class CollectionViewStackCell: UICollectionViewCell {

    internal var imageView: UIImageView?

    override init(frame: CGRect) {
        super.init(frame: frame)
        imageView = createImageView()
        createShadow()
    }

    required init?(coder _: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    internal override func prepareForReuse() {
        imageView?.image = nil
    }
}

// MARK: configure

extension CollectionViewStackCell {

    fileprivate func createImageView() -> UIImageView {

        let imageView = UIImageView(frame: CGRect.zero)
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.layer.shouldRasterize = true
        contentView.addSubview(imageView)

        contentView.addConstraints([
            createConstraint(imageView, toItem: contentView, attribute: .top),
            createConstraint(imageView, toItem: contentView, attribute: .bottom),
            createConstraint(imageView, toItem: contentView, attribute: .left),
            createConstraint(imageView, toItem: contentView, attribute: .right),
        ])

        return imageView
    }

    fileprivate func createConstraint(_ item: UIImageView, toItem: UIView, attribute: NSLayoutConstraint.Attribute) -> NSLayoutConstraint {
        return NSLayoutConstraint(item: item,
                                  attribute: attribute,
                                  relatedBy: .equal,
                                  toItem: toItem,
                                  attribute: attribute,
                                  multiplier: 1,
                                  constant: 0)
    }

    fileprivate func createShadow() {
        layer.masksToBounds = false
        layer.shadowOpacity = 0.30
        layer.shadowRadius = 10.0
        layer.shadowOffset = CGSize.zero
        layer.shadowPath = UIBezierPath(rect: bounds).cgPath
        layer.shouldRasterize = true
        layer.rasterizationScale = max(UIScreen.main.scale, 2.0)
    }

    fileprivate func addBlurOnImage(_: UIImageView) {

        let blurEffect = UIBlurEffect(style: .dark)
        let blurView = UIVisualEffectView(effect: blurEffect)
        blurView.translatesAutoresizingMaskIntoConstraints = false
        imageView!.insertSubview(blurView, at: 3)

        let vibrancyEffect = UIVibrancyEffect(blurEffect: blurEffect)
        let vibrancyView = UIVisualEffectView(effect: vibrancyEffect)
        vibrancyView.translatesAutoresizingMaskIntoConstraints = false
        blurView.contentView.addSubview(vibrancyView)
    }
}