//
//  CollectionViewCell.swift
//  MVMCoreUI
//
//  Created by Scott Pfeil on 4/6/20.
//  Copyright © 2020 Verizon Wireless. All rights reserved.
//

import Foundation

/// A base collection view cell with basic mvm functionality.
open class CollectionViewCell: UICollectionViewCell, MoleculeViewProtocol, MVMCoreViewProtocol {

    // Convenience helpers
    open var molecule: MoleculeViewProtocol?
    public let containerHelper = ContainerHelper()
    open var model: CollectionItemModelProtocol?

    private var initialSetupPerformed = false

    // MARK: - Inits
    public override init(frame: CGRect) {
        super.init(frame: .zero)
        initialSetup()
    }
    
    public required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        initialSetup()
    }
    
    private func initialSetup() {
        if !initialSetupPerformed {
            initialSetupPerformed = true
            setupView()
        }
    }
    
    // MARK: - MVMCoreViewProtocol
    open func setupView() {
        isAccessibilityElement = false
        contentView.isAccessibilityElement = false
        insetsLayoutMarginsFromSafeArea = false
        contentView.insetsLayoutMarginsFromSafeArea = false
        contentView.preservesSuperviewLayoutMargins = false
        MVMCoreUIUtility.setMarginsFor(self, leading: 0, top: 0, trailing: 0, bottom: 0)
    }
    
    open func updateView(_ size: CGFloat) {
        if let model = model as? ContainerModelProtocol {
            containerHelper.updateViewMargins(contentView, model: model, size: size)
        }
        (molecule as? MVMCoreViewProtocol)?.updateView(size)
    }
    
    open func reset() {
        molecule?.reset()
        backgroundColor = .white
    }
    
    // MARK: - MoleculeViewProtocol
    open func set(with model: MoleculeModelProtocol, _ delegateObject: MVMCoreUIDelegateObject?, _ additionalData: [AnyHashable: Any]?) {
        guard let model = model as? CollectionItemModelProtocol else { return }
        self.model = model

        if let moleculeModel = model as? MoleculeModelProtocol,
            let backgroundColor = moleculeModel.backgroundColor {
            self.backgroundColor = backgroundColor.uiColor
        }
        
        // align if needed.
        if let model = model as? ContainerModelProtocol {
            containerHelper.set(with: model, for: molecule as? MVMCoreUIViewConstrainingProtocol)
        }
    }
    
    /// Convenience function. Adds a molecule to the view.
    open func addMolecule(_ molecule: MoleculeViewProtocol) {
        contentView.addSubview(molecule)
        containerHelper.constrainView(molecule)
        self.molecule = molecule
    }
}