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

import UIKit
import VDSCoreTokens

///This is customised button for Pagination view
@objc(PaginationButton)
open class PaginationButton: ButtonBase {
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    /// Type of the PaginationButton
    private var type: Type = .next
    /// Button tint color configuration
    private let buttonTintColorConfiguration = SurfaceColorConfiguration(VDSColor.paletteBlack, VDSColor.paletteWhite)
    /// Button title color configuration
    private let buttonTextColorConfiguration = SurfaceColorConfiguration(VDSColor.paletteBlack, VDSColor.paletteWhite)
    /// Button configuration for iOS 15+
    @available(iOS 15.0, *)
    private var buttonConfiguration: Button.Configuration {
        var configuration = ButtonBase.Configuration.plain()
        configuration.imagePadding = VDSLayout.space2X
        configuration.imagePlacement = type == .next ? .trailing : .leading
        configuration.titleAlignment =  type == .next ? .trailing : .leading
        configuration.contentInsets = .zero
        return configuration
    }
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    /// TextStyle used on the titleLabel.
    open override var textStyle: TextStyle { TextStyle.boldBodySmall }
    /// UIColor used on the titleLabel text.
    open override var textColor: UIColor { buttonTextColorConfiguration.getColor(surface) }
    
    //--------------------------------------------------
    // MARK: - Initializers
    //--------------------------------------------------
    init(type: Type) {
        self.type = type
        super.init()
    }
    
    required public init() {
        super.init()
    }
    
    public required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
    
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    /// Executed on initialization for this View.
    open override func initialSetup() {
        super.initialSetup()
        if #available(iOS 15.0, *) {
            configuration = buttonConfiguration
        } else {
            semanticContentAttribute = type == .next ? .forceRightToLeft : .forceLeftToRight
            imageEdgeInsets = .init(top: 0, left: 0, bottom: 0, right: VDSLayout.space2X)
        }
        contentHorizontalAlignment = type == .next ? .trailing : .leading
    }
    
    /// Used to make changes to the View based off a change events or from local properties.
    open override func updateView() {
        text = type.title
        let color = buttonTintColorConfiguration.getColor(surface)
        setImage(type.image(color), for: .normal)
        tintColor = color
        super.updateView()
    }
}

extension PaginationButton {
    //--------------------------------------------------
    // MARK: - Enum to configure PaginationButton
    //--------------------------------------------------
    enum `Type` {
        case previous, next
        
        var title: String {
            switch self {
            case .next:
                "Next"
            case .previous:
                "Previous"
            }
        }
        
        private var imageSize: CGSize { Icon.Size.xsmall.dimensions }
        
        ///Image for the configuration type
        func image(_ color: UIColor) -> UIImage? {
            switch self {
            case .previous:
                UIImage.image(for: .paginationLeftArrow, color: color, renderingMode: .alwaysTemplate)?.resized(to: imageSize)
            case .next:
                UIImage.image(for: .paginationRightArrow, color: color, renderingMode: .alwaysTemplate)?.resized(to: imageSize)
            }
        }
    }
}