//
//  BreadcrumbItem.swift
//  VDS
//
//  Created by Kanamarlapudi, Vasavi on 05/03/24.
//

import Foundation
import VDSColorTokens
import VDSFormControlsTokens
import Combine

/// A Breadcrumb Item contains href(link) and selected flag.
/// Breadcrumb links to its respective page if it is not disabled.
/// Breadcrumb contains text with a separator by default, highlights text in bold without a separator if selected.
@objc (VDSBreadcrumbItem)
open class BreadcrumbItem: ButtonBase {
   
    //--------------------------------------------------
    // MARK: - Initializers
    //--------------------------------------------------
    required public init() {
        super.init(frame: .zero)
    }
    
    public override init(frame: CGRect) {
        super.init(frame: .zero)
    }
    
    public required init?(coder: NSCoder) {
        super.init(coder: coder)
    }
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    /// The Breadcrumb link to links to its respective page.
    open var link: String? { didSet { setNeedsUpdate() } }
    
    /// TextStyle used on the titleLabel.
    open override var textStyle: TextStyle { isSelected ? TextStyle.boldBodySmall : TextStyle.bodySmall }
        
    /// If true, it will be rendered as selected.
    open var selectable: Bool = false {
        didSet {
            //update selected state
            if selectable{
                isSelected = true
            } else {
                isSelected = false
            }
            setNeedsUpdate()
        }
    }
    
    /// UIColor used on the titleLabel text.
    open override var textColor: UIColor {
        textColorConfiguration.getColor(self)
    }
        
    /// The natural size for the receiving view, considering only properties of the view itself.
    open override var intrinsicContentSize: CGSize {
        return titleLabel?.intrinsicContentSize ?? super.intrinsicContentSize
    }
           
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    var separator = " /"
    
    private var textColorConfiguration = ControlColorConfiguration().with {
        $0.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark, forState: .normal)
        $0.setSurfaceColors(VDSColor.interactiveActiveOnlight, VDSColor.interactiveActiveOndark, forState: .highlighted)
        $0.setSurfaceColors(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark, forState: .selected)
    }
          
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    /// Called once when a view is initialized and is used to Setup additional UI or other constants and configurations.
    open override func setup() {
        super.setup()
        isAccessibilityElement = true
        accessibilityTraits = .button
        accessibilityLabel = "Breadcrumb"
    }

    /// Used to make changes to the View based off a change events or from local properties.
    open override func updateView() {
        //always call last so the label is rendered
        if (text != nil) {
            var newText: String = text ?? ""
            if isSelected {
                if newText.contains(separator) {
                    let result = newText.dropLast(2)
                    newText = String(result)
                }
            } else {
                if !newText.contains(separator) {
                    newText = (text ?? "") + separator
                }
            }
            print("newText:\(newText), isSelected: \(isSelected)")
            text = newText
            if let titleLabel {
                titleLabel.text = text
            }
        }
        super.updateView()

    }

    /// Resets to default settings.
    open override func reset() {
        super.reset()
        shouldUpdateView = false
        text = nil
        link = nil
        accessibilityCustomActions = []
        isAccessibilityElement = true
        accessibilityTraits = .button
        shouldUpdateView = true
        setNeedsUpdate()
    }
}