Lambda-School-Labs/nutrition-tracker-ios-pt7

//
//  TabBarItemBadgeView.swift
//  Nutrivurv
//
//  Created by Dillon on 8/5/20.
//  Copyright © 2020 Lambda School. All rights reserved.
//
import UIKit


open class TabBarItemBadgeView: UIView {

    
    public static var defaultBadgeColor = UIColor(red: 255.0/255.0, green: 59.0/255.0, blue: 48.0/255.0, alpha: 1.0)

    /// Badge color
    open var badgeColor: UIColor? = defaultBadgeColor {
        didSet {
            imageView.backgroundColor = badgeColor
        }
    }

    /// Badge value, supprot nil, "", "1", "someText". Hidden when nil. Show Little dot style when "".
    open var badgeValue: String? {
        didSet {
            badgeLabel.text = badgeValue
        }
    }


    open var imageView: UIImageView = {
        let imageView = UIImageView.init(frame: CGRect.zero)
        imageView.backgroundColor = .clear
        return imageView
    }()


    open var badgeLabel: UILabel = {
        let badgeLabel = UILabel.init(frame: CGRect.zero)
        badgeLabel.backgroundColor = .clear
        badgeLabel.textColor = .white
        badgeLabel.font = UIFont.systemFont(ofSize: 13.0)
        badgeLabel.textAlignment = .center
        return badgeLabel
    }()

    
    public override init(frame: CGRect) {
        super.init(frame: frame)
        self.addSubview(imageView)
        self.addSubview(badgeLabel)
        self.imageView.backgroundColor = badgeColor
    }
    public required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    open override func layoutSubviews() {
        super.layoutSubviews()
        guard let badgeValue = badgeValue else {
            imageView.isHidden = true
            badgeLabel.isHidden = true
            return
        }

        imageView.isHidden = false
        badgeLabel.isHidden = false

        if badgeValue == "" {
            imageView.frame = CGRect.init(origin: CGPoint.init(x: (bounds.size.width - 8.0) / 2.0, y: (bounds.size.height - 8.0) / 2.0), size: CGSize.init(width: 8.0, height: 8.0))
        } else {
            imageView.frame = bounds
        }
        imageView.layer.cornerRadius = imageView.bounds.size.height / 2.0
        badgeLabel.sizeToFit()
        badgeLabel.center = imageView.center
    }
    
    open override func sizeThatFits(_ size: CGSize) -> CGSize {
        guard let _ = badgeValue else {
            return CGSize.init(width: 18.0, height: 18.0)
        }
        let textSize = badgeLabel.sizeThatFits(CGSize.init(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude))
        return CGSize.init(width: max(18.0, textSize.width + 10.0), height: 18.0)
    }

}