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: ModelScrollViewController<DefaultLabelModel> {

    enum PickerType {
        case surface, textSize, fontCategory
    }
    var surfacePickerSelectorView = PickerSelectorView(title: "")
    var textSizePickerSelectorView = PickerSelectorView(title: "")
    var fontCategoryPickerSelectorView = PickerSelectorView(title: "")
    var boldSwitch = UISwitch()
    var disabledSwitch = UISwitch()
    var textField = TextField()
    private var isBold: Bool = false

    var label = Label()

    override func viewDidLoad() {
        super.viewDidLoad()
        addContentTopView(view: label)

        setupForm()
        setupPicker()
        setupModel()
    }
    
    func setupForm(){
        addFormRow(label: "Disabled", view: disabledSwitch)
        addFormRow(label: "Bold", view: boldSwitch)
        addFormRow(label: "Surface", view: surfacePickerSelectorView)
        addFormRow(label: "Font Category", view: fontCategoryPickerSelectorView)
        addFormRow(label: "Text Size", view: textSizePickerSelectorView)
        addFormRow(label: "Text", view: textField)

        disabledSwitch
            .publisher(for: .valueChanged)
            .sink { [weak self] sender in
                self?.label.disabled = sender.isOn
            }.store(in: &subscribers)

        boldSwitch
            .publisher(for: .valueChanged)
            .sink { [weak self] sender in
                self?.isBold = sender.isOn
                self?.updateLabelStyle()
            }.store(in: &subscribers)

        surfacePickerSelectorView.button
            .publisher(for: .touchUpInside)
            .sink { [weak self] _ in
                self?.pickerType = .surface
            }.store(in: &subscribers)

        fontCategoryPickerSelectorView.button
            .publisher(for: .touchUpInside)
            .sink { [weak self] _ in
                self?.pickerType = .fontCategory
            }.store(in: &subscribers)

        textSizePickerSelectorView.button
            .publisher(for: .touchUpInside)
            .sink { [weak self] _ in
                self?.pickerType = .textSize
            }.store(in: &subscribers)

        textField
            .textPublisher
            .sink { [weak self] text in
                self?.label.text = text
            }.store(in: &subscribers)
    }
    
    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
        surfacePickerSelectorView.text = model.surface.rawValue
        disabledSwitch.isOn = model.disabled
        boldSwitch.isOn = isBold
        textField.text = model.text
        
        //set the font
        fontCategory = .feature
        fontCategoryPickerSelectorView.text = "Feature"
        textSize = .small
        textSizePickerSelectorView.text = "Small"
    }
    
    override func updateView(viewModel: DefaultLabelModel) {
        label.set(with: viewModel)
    }
      
    //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 {
            fontCategoryPickerSelectorView.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 {
            textSizePickerSelectorView.text = textSize?.rawValue ?? ""
            updateLabelStyle()
        }
        
    }
    
    func updateLabelStyle(){
        if let style = fontCategory.style(for: textSize, isBold: isBold) {
            label.typograpicalStyle = style
        }
    }
    
    func setupPicker(){
        surfacePicker.onPickerDidSelect = {  [weak self] item in
            self?.label.surface = item
            self?.contentTopView.backgroundColor = item.color
            self?.surfacePickerSelectorView.text = item.rawValue
        }
        
        textSizePicker.onPickerDidSelect = {  [weak self] item in
            self?.textSize = item
        }

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