//
//  CollectionView.swift
//  VDS
//
//  Created by Matt Bruce on 8/25/22.
//

import Foundation
import UIKit
import Combine

open class CollectionView: UICollectionView, ModelHandlerable, ViewProtocol, Resettable {
    
    //--------------------------------------------------
    // MARK: - Combine Properties
    //--------------------------------------------------
    public var subject = PassthroughSubject<Void, Never>()
    public var subscribers = Set<AnyCancellable>()
    
    //--------------------------------------------------
    // MARK: - Properties
    //--------------------------------------------------
    private var initialSetupPerformed = false

    open var surface: Surface = .light { didSet { subject.send() }}
    
    open var disabled: Bool = false { didSet { isEnabled = !disabled } }
        
    open var isEnabled: Bool {
        get { !disabled }
        set {
            if disabled != !newValue {
                disabled = !newValue
            }
            isUserInteractionEnabled = isEnabled
            subject.send()
        }
    }
    
    //--------------------------------------------------
    // MARK: - Initializers
    //--------------------------------------------------
    required public init() {
        super.init(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout())
        initialSetup()
    }
    
    public required init(collectionViewLayout layout: UICollectionViewLayout) {
        super.init(frame: .zero, collectionViewLayout: layout)
        initialSetup()
    }
    
    public override init(frame: CGRect, collectionViewLayout layout: UICollectionViewLayout) {
        super.init(frame: frame, collectionViewLayout: layout)
        initialSetup()
    }

    public required init?(coder: NSCoder) {
        super.init(coder: coder)
        initialSetup()
    }
    
    //--------------------------------------------------
    // MARK: - Setup
    //--------------------------------------------------
    
    open func initialSetup() {
        if !initialSetupPerformed {
            initialSetupPerformed = true
            setupUpdateView()
            setup()
            updateView()
        }
    }
    
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    open func updateView() {
        fatalError("Implement updateView")
    }
        
    open func reset() {
        backgroundColor = .clear
        surface = .light
        disabled = false
    }
    
    // MARK: - ViewProtocol    
    /// Will be called only once.
    open func setup() {
        translatesAutoresizingMaskIntoConstraints = false
        insetsLayoutMarginsFromSafeArea = false
    }
}