//
//  TextLink.swift
//  VDS
//
//  Created by Matt Bruce on 11/1/22.
//

import Foundation
import UIKit
import VDSColorTokens
import VDSFormControlsTokens
import Combine

@objc(VDSTextLink)
open class TextLink: Control, Buttonable {
    
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    private var heightConstraint: NSLayoutConstraint?
    private var label = Label()
    
    //--------------------------------------------------
    // MARK: - Properties
    //--------------------------------------------------
    open var text: String? { didSet { didChange() } }
        
    open var size: ButtonSize = .large { didSet { didChange() }}
        
    public var availableSizes: [ButtonSize] { [.large, .small] }

    private var height: CGFloat {
        switch size {
        case .large:
            return 44
        case .small:
            return 32
        }
    }

    //--------------------------------------------------
    // MARK: - Initializers
    //--------------------------------------------------
    required public init() {
        super.init(frame: .zero)
        initialSetup()
    }
    
    public override init(frame: CGRect) {
        super.init(frame: .zero)
        initialSetup()
    }
    
    public required init?(coder: NSCoder) {
        super.init(coder: coder)
        initialSetup()
    }
    
    //--------------------------------------------------
    // MARK: - Public Functions
    //--------------------------------------------------
    open override func initialSetup() {
        super.initialSetup()
    }
    
    open override func setup() {
        super.setup()
        
        addSubview(label)
        
        //add tapGesture to self
        publisher(for: UITapGestureRecognizer()).sink { [weak self] _ in
            self?.sendActions(for: .touchUpInside)
        }.store(in: &subscribers)

        //pin stackview to edges
        label.pinToSuperView()
        label.numberOfLines = 1
        label.preferredMaxLayoutWidth = 0
        heightConstraint = heightAnchor.constraint(equalToConstant: height)
        heightConstraint?.isActive = true
    }

    open override func reset() {
        super.reset()
        label.reset()
        size = .large
        text = nil
        
        accessibilityCustomActions = []
        accessibilityTraits = .staticText
    }
    
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    override open var intrinsicContentSize: CGSize {
        return CGSize(width: label.intrinsicContentSize.width, height: height)
    }
    
    open override func updateView() {
        label.surface = surface
        label.disabled = disabled
        label.typograpicalStyle = size == .large ? TypographicalStyle.BodyLarge : TypographicalStyle.BodySmall
        label.text = text ?? ""
        label.attributes = [UnderlineLabelAttribute(location: 0, length: label.text!.count)]
        heightConstraint?.constant = height
    }

}