vds_ios_sample/VDSSample/ViewControllers/LabelViewController.swift

//
//  LabelViewController.swift
//  VDSSample
//
//  Created by Matt Bruce on 8/16/22.
//

import Foundation
import UIKit
import VDS
import VDSColorTokens

class LabelViewController: ModelViewController<DefaultLabelModel>, StoryboardInitable {
    deinit {
        print("\(Self.self) deinit")
    }

    enum PickerType {
        case surface, textSize, fontCategory
    }
    
    static var storyboardId: String = "label"
    static var storyboardName: String = "Components"

    @IBOutlet weak var containerView: UIView!
    @IBOutlet weak var picker: UIPickerView!
    @IBOutlet weak var surfaceLabel: UILabel!
    @IBOutlet weak var textSizeLabel: UILabel!
    @IBOutlet weak var fontCategoryLabel: UILabel!
    @IBOutlet weak var boldswitch: UISwitch!
    @IBOutlet weak var disabledSwitch: UISwitch!
    @IBOutlet weak var textField: UITextField!
    private var isBold: Bool = false

    var label: Label!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        label = Label()
        label.translatesAutoresizingMaskIntoConstraints = false
        containerView.addSubview(label)
        label.topAnchor.constraint(equalTo: containerView.topAnchor, constant: 20).isActive = true
        label.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: 20).isActive = true
        label.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: -20).isActive = true
        label.bottomAnchor.constraint(equalTo: containerView.bottomAnchor, constant: -20).isActive = true
        
        view.addGestureRecognizer(UITapGestureRecognizer(target: self.view, action: #selector(UIView.endEditing(_:))))
        setupPicker()
        setupModel()
    }
    
    func setupModel() {
        var defaultModel = DefaultLabelModel()
        defaultModel.text = "Label Component"
        defaultModel.typograpicalStyle = .FeatureSmall
        set(with: defaultModel)
        
        label
            .handlerPublisher()
            .sink { [weak self] viewModel in
                self?.model = viewModel
            }.store(in: &subscribers)

        //setup UI
        surfaceLabel.text = model.surface.rawValue
        disabledSwitch.isOn = model.disabled
        boldswitch.isOn = isBold
        textField.text = model.text
        
        //set the font
        fontCategory = .feature
        fontCategoryLabel.text = "Feature"
        textSize = .small
        textSizeLabel.text = "Small"
    }
    
    override func updateView(viewModel: DefaultLabelModel) {
        label.set(with: viewModel)
    }
    
    @IBAction func disabledChanged(_ sender: UISwitch) {
        label.isEnabled = !sender.isOn
    }
    
    @IBAction func boldChanged(_ sender: UISwitch) {
        isBold = sender.isOn
        updateLabelStyle()
    }
    
    @IBAction func textDidEnd(_ sender: UITextField) {
        label.text = sender.text?.replacingOccurrences(of: "\\n", with: "\n") ?? "Label Component"
        sender.resignFirstResponder()
    }
       
    @IBAction func surfaceClick(_ sender: Any) {
        pickerType = .surface
    }
    
    @IBAction func textSizeClick(_ sender: Any) {
        pickerType = .textSize
    }
    
    @IBAction func fontCategoryClick(_ sender: Any) {
        pickerType = .fontCategory
    }
    
    //Picker
    var surfacePicker = SurfacePicker()
    var textSizePicker = TextSizePicker()
    var fontCategoryPicker = FontCategoryPicker()
    
    var pickerType: PickerType = .surface {
        didSet {
            func update(object: UIPickerViewDelegate & UIPickerViewDataSource){
                picker.delegate = object
                picker.dataSource = object
            }

            switch pickerType{
            case .surface:
                update(object: surfacePicker)
            case .textSize:
                update(object: textSizePicker)
            case .fontCategory:
                update(object: fontCategoryPicker)
            }
            picker.reloadAllComponents()
            picker.selectRow(0, inComponent: 0, animated: false)
            picker.isHidden = false
        }
    }
        
    private var fontCategory: TypographicalStyle.FontCategory = .feature {
        didSet {
            fontCategoryLabel.text = fontCategory.rawValue
            textSizePicker.items = fontCategory.sizes
            if textSizePicker.items.count > 0 {
                textSize = textSizePicker.items[0]
            } else {
                textSize = nil
            }
            updateLabelStyle()
        }
    }
    
    private var textSize: TypographicalStyle.FontSize? = .large {
        didSet {
            textSizeLabel.text = textSize?.rawValue ?? ""
            updateLabelStyle()
        }
        
    }
    
    func updateLabelStyle(){
        if let style = fontCategory.style(for: textSize, isBold: isBold) {
            label.model.typograpicalStyle = style
        }
    }
    
    func setupPicker(){
        picker.isHidden = true
        surfacePicker.onPickerDidSelect = {  [weak self] item in
            self?.label.surface = item
            self?.containerView.backgroundColor = item.color
            self?.surfaceLabel.text = item.rawValue
        }
        
        textSizePicker.onPickerDidSelect = {  [weak self] item in
            self?.textSize = item
        }

        fontCategoryPicker.onPickerDidSelect = {  [weak self] item in
            self?.fontCategory = item
        }
    }
}