//
//  ListUnordered.swift
//  VDS
//
//  Created by Vasavi Kanamarlapudi on 16/10/24.
//

import Foundation
import UIKit
import VDSCoreTokens

/// List unordered breaks up related content into distinct phrases or sentences, which improves scannability.
/// This component should be used when the text items don’t need to be in numeric order.
@objcMembers
@objc(VDSListUnordered)
open class ListUnordered: View {
 
    //--------------------------------------------------
    // 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: - Enums
    //--------------------------------------------------
    /// Enum that represents the size availble for the component.
    public enum Size: String, DefaultValuing, CaseIterable {
        case large
        case medium
        case small
        case micro

        public static var defaultValue: Self { .large }
        
        /// TextStyle relative to Size.
        public var textStyle: TextStyle.StandardStyle {
            switch self {
            case .large:
                return .bodyLarge
            case .medium:
                return .bodyMedium
            case .small:
                return .bodySmall
            case .micro:
                return .micro
            }
        }
    }
    
    /// Enum that represents the type of spacing available for the component.
    public enum Spacing: String, CaseIterable {
        case standard, compact
    }
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    /// Size of the component. The default size is Large.
    open var size: Size = .defaultValue { didSet { setNeedsUpdate() } }
            
    /// Spacing type of the component.
    open var spacing: Spacing = .standard { didSet { setNeedsUpdate() } }
    
    /// Lead-in text that shows as the top text for the component. This is optional.
    open var leadInText: String?

    /// Array of unordered list items to show for the component.
    open var unorderedList: [ListUnorderedItemModel] = [] { didSet { setNeedsUpdate() }}

    //--------------------------------------------------
    // MARK: - Configuration Properties
    //--------------------------------------------------
    // It can be used for Glyph level 1.
    private var disc = "•"
    
    // It can be used for Glyph Level 2.
    private var endash = "–"
    
    // Spacing between unordered list items.
    private var spaceBetweenItems: CGFloat {
        switch (size, spacing) {
        case (.large, .standard):
            return VDSLayout.space4X
        case (.medium, .standard), (.small, .standard), (.micro, .standard):
            return VDSLayout.space3X
        case (.large, .compact):
            return VDSLayout.space2X
        case (.medium, .compact), (.small, .compact), (.micro, .compact):
            return VDSLayout.space1X
        }
    }
    
    // Padding that can be used in an item between the glyph and the item text.
    private var padding: CGFloat {
        switch (size, spacing) {
        case (.large, .standard), (.large, .compact):
            return VDSLayout.space3X
        case (.medium, .standard), (.small, .standard), (.micro, .standard), (.medium, .compact), (.small, .compact), (.micro, .compact):
            return VDSLayout.space2X
        }
    }
    
    private let textColorConfiguration = SurfaceColorConfiguration(VDSColor.elementsPrimaryOnlight, VDSColor.elementsPrimaryOndark)
    
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    private lazy var listStackView = UIStackView().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.axis = .vertical
        $0.distribution = .fill
        $0.spacing = VDSLayout.space3X
        $0.backgroundColor = .clear
    }
    
    private lazy var itemStackView = UIStackView().with {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.axis = .horizontal
        $0.alignment = .leading
        $0.distribution = .fill
        $0.spacing = padding
        $0.backgroundColor = .clear
    }
    
    internal var symbolLabel = Label().with {
        $0.isAccessibilityElement = true
        $0.numberOfLines = 1
        $0.sizeToFit()
    }
    
    internal var textLabel = Label().with {
        $0.isAccessibilityElement = true
        $0.lineBreakMode = .byWordWrapping
    }
    
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    /// Called once when a view is initialized and is used to Setup additional UI or other constants and config.texturations.
    open override func setup() {
        super.setup()
        
        // add stackview
        addSubview(listStackView)
        listStackView.pinToSuperView()
    }
    
    open override func setDefaults() {
        super.setDefaults()
        leadInText = nil
        unorderedList = []
    }
    
    /// Resets to default settings.
    open override func reset() {
        symbolLabel.reset()
        textLabel.reset()
        super.reset()
    }
    
    /// Used to make changes to the View based off a change events or from local properties.
    open override func updateView() {
        super.updateView()
        if leadInText != nil {
            textLabel.text = leadInText
            textLabel.textStyle = size.textStyle.regular
            textLabel.textColor = textColorConfiguration.getColor(surface)
            textLabel.surface = surface
            listStackView.addArrangedSubview(textLabel)
        }
    }
    
    //--------------------------------------------------
    // MARK: - Private Methods
    //--------------------------------------------------
   
}