mvm_core_ui/MVMCoreUI/Molecules/StandardHeaderView.swift

//
//  StandardHeaderView.swift
//  MVMCoreUI
//
//  Created by Scott Pfeil on 2/12/19.
//  Copyright © 2019 Verizon Wireless. All rights reserved.
//

import UIKit

public class StandardHeaderView: ViewConstrainingView {
    let headlineLabel = Label.commonLabelH2(true)
    let messageLabel = Label.commonLabelB2(true)
    var separatorView: SeparatorView?
    var spaceBetweenLabels: NSLayoutConstraint?
    var leftConstraintTitle: NSLayoutConstraint?
    var rightConstraintTitle: NSLayoutConstraint?
    var leftConstraintMessage: NSLayoutConstraint?
    var rightConstraintMessage: NSLayoutConstraint?
    private var heightConstraint: NSLayoutConstraint?
    
    public override func updateView(_ size: CGFloat) {
        super.updateView(size)
        headlineLabel.updateView(size)
        messageLabel.updateView(size)
        separatorView?.updateView(size)
        setSpacing()
    }
    
    public override func setupView() {
        super.setupView()
        if separatorView == nil {
            translatesAutoresizingMaskIntoConstraints = false
            backgroundColor = .clear
            clipsToBounds = true
            
            addSubview(headlineLabel)
            addSubview(messageLabel)
            
            headlineLabel.setContentHuggingPriority(UILayoutPriority.required, for: NSLayoutConstraint.Axis.vertical)
            messageLabel.setContentHuggingPriority(UILayoutPriority.required, for: NSLayoutConstraint.Axis.vertical)
            setContentHuggingPriority(UILayoutPriority.required, for: NSLayoutConstraint.Axis.vertical)
            
            topPin = headlineLabel.topAnchor.constraint(equalTo: topAnchor, constant: PaddingFive)
            topPin?.isActive = true

            spaceBetweenLabels = messageLabel.topAnchor.constraint(equalTo: headlineLabel.bottomAnchor, constant: PaddingTwo)
            spaceBetweenLabels?.isActive = true
            
            leftConstraintTitle = headlineLabel.leftAnchor.constraint(equalTo: leftAnchor)
            leftConstraintTitle?.isActive = true
            
            rightConstraintTitle = rightAnchor.constraint(equalTo: headlineLabel.rightAnchor)
            rightConstraintTitle?.isActive = true

            leftConstraintMessage = messageLabel.leftAnchor.constraint(equalTo: leftAnchor)
            leftConstraintMessage?.isActive = true
            
            rightConstraintMessage = rightAnchor.constraint(equalTo: messageLabel.rightAnchor)
            rightConstraintMessage?.isActive = true
            
            bottomPin = bottomAnchor.constraint(equalTo: messageLabel.bottomAnchor, constant: PaddingDefaultVerticalSpacing)
            bottomPin?.isActive = true
            
            heightConstraint = heightAnchor.constraint(equalToConstant: 0)
            heightConstraint?.priority = UILayoutPriority(rawValue: 950)
            
            if let separatorView = SeparatorView.separatorAdd(to: self, position: SeparatorPositionBot, withHorizontalPadding: 0) {
                separatorView.setAsHeavy()
                separatorView.isHidden = true
                addSubview(separatorView)
                self.separatorView = separatorView
            }
        }
    }
    
    public func setSpacing() {
        if headlineLabel.hasText && messageLabel.hasText {
            spaceBetweenLabels?.constant = PaddingTwo
            show()
        } else if headlineLabel.hasText || messageLabel.hasText {
            spaceBetweenLabels?.constant = 0
            show()
        } else {
            hide()
        }
    }
    
    public override func show() {
        super.show()
        heightConstraint?.isActive = false
        layoutIfNeeded()
    }

    public override func hide() {
        super.hide()
        heightConstraint?.isActive = true
        layoutIfNeeded()
    }
    
    public override func setLeftPinConstant(_ constant: CGFloat) {
        leftConstraintTitle?.constant = constant
        leftConstraintMessage?.constant = constant
        separatorView?.leftPin?.constant = constant
    }
    
    public override func setRightPinConstant(_ constant: CGFloat) {
        rightConstraintTitle?.constant = constant
        rightConstraintMessage?.constant = constant
        separatorView?.rightPin?.constant = constant
    }
    
    open override func setWithJSON(_ json: [AnyHashable: Any]?, delegateObject: DelegateObject?, additionalData: [AnyHashable: Any]?) {
        super.setWithJSON(json, delegateObject: delegateObject, additionalData: additionalData)
        if let colorString = json?.optionalStringForKey(KeyBackgroundColor) {
            backgroundColor = .mfGet(forHex: colorString)
        }
        if let colorString = json?.optionalStringForKey("contentColor") {
            let color = UIColor.mfGet(forHex: colorString)
            headlineLabel.textColor = color
            messageLabel.textColor = color
            separatorView?.backgroundColor = color
        }
        
        let headlineJSON = json?.optionalDictionaryForKey("headline")
        headlineLabel.setWithJSON(headlineJSON, delegateObject: delegateObject, additionalData: additionalData)
        let bodyJSON = json?.optionalDictionaryForKey("body")
        messageLabel.setWithJSON(bodyJSON, delegateObject: delegateObject, additionalData: additionalData)
        let separatorJSON = json?.optionalDictionaryForKey("separator")
        separatorView?.setWithJSON(separatorJSON, delegateObject: delegateObject, additionalData: additionalData)
        
        if separatorView?.isHidden ?? true {
            bottomPin?.constant = 0
        } else {
            bottomPin?.constant = PaddingDefaultVerticalSpacing
        }
    }
}