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: BaseViewController<Label> {

    lazy var textSizePickerSelectorView = {
        TextSizePickerSelectorView(title: "",
                                   picker: self.picker)
    }()
    
    lazy var textPositionPickerSelectorView = {
        PickerSelectorView(title: TextPosition.left.rawValue,
                            picker: self.picker,
                           items: TextPosition.allCases)
    }()

    lazy var fontCategoryPickerSelectorView = {
        FontCategoryPickerSelectorView(title: "",
                                       picker: self.picker)
    }()
    var lineheightRange = Slider()
    var lineSpacingRange = Slider()
    var baselineOffsetRange = Slider()
    var currentStyle: TextStyle!
    var boldSwitch = Toggle()
    var disabledSwitch = Toggle()
    var textField = TextField()
    private var isBold: Bool = false
    var lineHeightLabel = UILabel().with { $0.translatesAutoresizingMaskIntoConstraints = false; $0.lineBreakMode = .byWordWrapping; $0.numberOfLines = 0}
    override func viewDidLoad() {
        super.viewDidLoad()
        let stack = UIStackView()
        stack.axis = .vertical
        stack.spacing = 10
        stack.addArrangedSubview(component)
        stack.addArrangedSubview(lineHeightLabel)

        addContentTopView(view: stack)

        setupPicker()
        setupModel()
    }
    var defaultLineHeightLabel: UILabel?

    override func allTextFields() -> [TextField]? { [textField] }

    override func setupForm(){
        super.setupForm()  
        addFormRow(label: "Disabled", view: disabledSwitch)
        addFormRow(label: "Bold", view: boldSwitch)
        addFormRow(label: "Surface", view: surfacePickerSelectorView)
        addFormRow(label: "Text Position", view: textPositionPickerSelectorView)
        addFormRow(label: "Font Category", view: fontCategoryPickerSelectorView)
        addFormRow(label: "Text Size", view: textSizePickerSelectorView)
        let view = addFormRow(label: "Line Height", view: lineheightRange)
        addFormRow(label: "Line Spacing", view: lineSpacingRange)
        addFormRow(label: "Baseline Offset", view: baselineOffsetRange)
        defaultLineHeightLabel = view.viewWithTag(1) as? UILabel
        addFormRow(label: "Text", view: textField)
        
        disabledSwitch.onChange = { [weak self] sender in
            self?.component.disabled = sender.isOn
        }

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

        textField
            .textPublisher
            .sink { [weak self] text in
                self?.component.text = text
                self?.lineHeightLabel.text = text
            }.store(in: &subscribers)
        
        lineheightRange.maximumValue = 20.0
        lineheightRange.minimumValue = 0.0
        lineheightRange.value = 2.0
        lineheightRange.publisher(for: .valueChanged).sink(receiveValue: { [weak self] slider in
            guard let self else { return }
            let textStyle = self.component.textStyle
            self.component.textStyle = TextStyle(rawValue: textStyle.rawValue,
                                                 fontFace: textStyle.fontFace,
                                                 pointSize: textStyle.pointSize,
                                                 lineHeight: CGFloat(slider.value),
                                                 letterSpacing: textStyle.letterSpacing)
        }).store(in: &subscribers)

        lineSpacingRange.maximumValue = 80.0
        lineSpacingRange.minimumValue = 0.0
        lineSpacingRange.value = 0.0
        lineSpacingRange.publisher(for: .valueChanged).sink(receiveValue: { [weak self] slider in
            guard let self else { return }
            let textStyle = self.component.textStyle
            self.component.textStyle = TextStyle(rawValue: textStyle.rawValue,
                                                 fontFace: textStyle.fontFace,
                                                 pointSize: textStyle.pointSize,
                                                 lineHeight: textStyle.lineHeight,
                                                 letterSpacing: textStyle.letterSpacing,
                                                 lineSpacing: CGFloat(slider.value),
                                                 baselineOffset: textStyle.baselineOffset
            )
        }).store(in: &subscribers)

        baselineOffsetRange.maximumValue = 100
        baselineOffsetRange.minimumValue = -100
        baselineOffsetRange.value = 0.0
        baselineOffsetRange.publisher(for: .valueChanged).sink(receiveValue: { [weak self] slider in
            guard let self else { return }
            let textStyle = self.component.textStyle
            self.component.textStyle = TextStyle(rawValue: textStyle.rawValue,
                                                 fontFace: textStyle.fontFace,
                                                 pointSize: textStyle.pointSize,
                                                 lineHeight: textStyle.lineHeight,
                                                 letterSpacing: textStyle.letterSpacing,
                                                 lineSpacing: textStyle.lineSpacing,
                                                 baselineOffset: CGFloat(slider.value)
            )
        }).store(in: &subscribers)
        
    }
        
    func setupModel() {
        component.text = "Label Component"
        component.textStyle = .featureSmall
        lineHeightLabel.text = component.text
        lineHeightLabel.font = component.textStyle.font
        
        //setup UI
        surfacePickerSelectorView.text = component.surface.rawValue
        disabledSwitch.isOn = component.disabled
        boldSwitch.isOn = isBold
        textField.text = component.text
        
        //set the font
        fontCategory = .feature
        fontCategoryPickerSelectorView.text = "Feature"
        textSize = .small
        textSizePickerSelectorView.text = "Small"
        updateLabelStyle()
        
    }
    
    override func showDebug(show: Bool) {
        super.showDebug(show: show)
        lineHeightLabel.debugBorder(show: show)
    }

    //Picker
    private var fontCategory: TextStyle.FontCategory = .feature {
        didSet {
            fontCategoryPickerSelectorView.text = fontCategory.rawValue
            textSizePickerSelectorView.items = fontCategory.sizes
            if textSizePickerSelectorView.items.count > 0 {
                textSize = textSizePickerSelectorView.items[0]
            } else {
                textSize = nil
            }
            updateLabelStyle()
        }
    }
    
    private var textSize: TextStyle.FontSize? = .large {
        didSet {
            textSizePickerSelectorView.text = textSize?.rawValue ?? ""
            updateLabelStyle()
        }
        
    }
    
    func updateLabelStyle(){
        if let style = fontCategory.style(for: textSize, isBold: isBold) {
            component.textStyle = style
            currentStyle = style
            let defaultLineHeight = style.font.lineHeight
            lineHeightLabel.font = style.font
            lineheightRange.maximumValue = Float(defaultLineHeight) * 1.50
            lineheightRange.minimumValue = Float(defaultLineHeight) * 0.50
            lineheightRange.value = Float(style.lineHeight)
            defaultLineHeightLabel?.text = "Line Height - d:\(defaultLineHeight) s:\(currentStyle.lineHeight)"
        }
    }

    func setupPicker(){
        surfacePickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.surface = item
            self?.contentTopView.backgroundColor = item.color
        }

        textPositionPickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.component.textPosition = item
        }
        
        textSizePickerSelectorView.onPickerDidSelect = {  [weak self] item in
            self?.textSize = item
        }

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