/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    Defines a table view cell used in the `DreamListViewController` to

                display a summary of a dream. Note that this cell uses a `MultiPaneLayout` 

                to layout its content.

*/

import UIKit

/// A table view cell that displays a summary of a `Dream`.

class DreamCell: UITableViewCell {

    // MARK: Properties

    static let reuseIdentifier = "\(DreamCell.self)"

    var content = UILabel()

    var accessories = [UIImageView]()

    var dream: Dream! {

        didSet {

            // Update the UI when the `dream` changes.

            accessories = (0..<dream.numberOfCreatures).map { _ in

                let imageView = UIImageView(image: dream.creature.image)

                imageView.contentMode = .scaleAspectFit

                return imageView

            }

            content.text = dream.description

            for subview in contentView.subviews {

                subview.removeFromSuperview()

            }

            addSubviews()

            setNeedsLayout()

        }

    }

    // MARK: Initialization

    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {

        super.init(style: style, reuseIdentifier: reuseIdentifier)

        addSubviews()

    }

    required init?(coder aDecoder: NSCoder) {

        fatalError("\(#function) has not been implemented")

    }

    // MARK: Layout

    private func addSubviews() {

        let multiPaneLayout = MultiPaneLayout(content: content, accessories: accessories)

        for view in multiPaneLayout.contents {

            contentView.addSubview(view)

        }

    }

    override func layoutSubviews() {

        super.layoutSubviews()

        /*

            This is the intersection between the UIKit view code and this sample's

            value based layout system.

        */

        var multiPaneLayout = MultiPaneLayout(content: content, accessories: accessories)

        multiPaneLayout.layout(in: contentView.bounds)

    }

}