//
//  PaginationCellItem.swift
//  VDS
//
//  Created by Bandaru, Krishna Kishore on 05/03/24.
//

import UIKit
import VDSCoreTokens

///This is customised view for Pagination cell item
final class PaginationCellItem: UICollectionViewCell {
    
    ///Identifier for the PaginationCellItem
    static let identifier: String = String(describing: PaginationCellItem.self)

    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    ///Text color configuration for the element
    private let textColorConfiguration = SurfaceColorConfiguration(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark)
    ///Pagination index label
    private var indexLabel: Label = Label().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.textAlignment = .center
        $0.isAccessibilityElement = false
        $0.numberOfLines = 1
    }
    
    //--------------------------------------------------
    // MARK: - Initializers
    //--------------------------------------------------
    override init(frame: CGRect) {
        super.init(frame: frame)
        setUp()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setUp()
    }
    
    ///Configuring the cell with default setup
    private func setUp() {
        let containerView = View()
        containerView.translatesAutoresizingMaskIntoConstraints = false
        containerView.addSubview(indexLabel)
        contentView.addSubview(containerView)
        containerView.pinToSuperView()
        indexLabel.pinToSuperView()
        indexLabel.widthGreaterThanEqualTo(VDSLayout.space5X)
        contentView.backgroundColor = .clear
        containerView.backgroundColor = .clear
        indexLabel.backgroundColor = .clear
    }
    
    ///Updating UI based on selected index, current index along with surface
    func update(_ selectedIndex: Int, currentIndex: Int, surface: Surface) {
        indexLabel.textStyle = selectedIndex == currentIndex ? .boldBodySmall : .bodySmall
        indexLabel.text = "\(currentIndex + 1)"
        indexLabel.textColor = textColorConfiguration.getColor(surface)
    }
}