OvalButtonWithShadow

//
//  CoveOvalButton.swift
//  cove-ios
//
//  Created by Josip Rezic on 14/08/2019.
//

import cove_ios_styling
import SnapKit

final class CoveOvalButton: UIButton {

    static let defaultHeight = 60.0
    static let defaultWidth = 207.0

    private let style: CoveOvalButtonStyle

    override var bounds: CGRect {
        didSet {
            roundCorners()
        }
    }

    override var isEnabled: Bool {
        didSet {
            updateStyling()
        }
    }

    override var isHighlighted: Bool {
        didSet {
            updateStyling()
        }
    }

    init(style: CoveOvalButtonStyle) {
        self.style = style
        super.init(frame: .zero)
        updateStyling()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func setTitle(_ title: String?, for state: UIControl.State) {
        super.setTitle(title?.uppercased(), for: state)
    }

    private func updateStyling() {
        setupUI(textColor: style.titleColor, font: style.font)
        setTitleColor(style.titleColorDisabled, for: .disabled)

        roundCorners()
        setBackgroundColor()
        addBorder()
        addShadow()
    }

    private func roundCorners() {
        layer.cornerRadius = frame.height / 2.0
    }

    private func setBackgroundColor() {
        if isEnabled {
            backgroundColor = isHighlighted ? style.backgroundColorHighlighted : style.backgroundColor
        } else {
            backgroundColor = style.backgroundColorDisabled
        }
    }

    private func addShadow() {
        layer.shadowColor = Style.Color.defaultShadow.cgColor
        layer.shadowOffset = CGSize(width: 0, height: 10)
        layer.shadowOpacity = 1.0
        layer.shadowRadius = 10.0
        layer.masksToBounds = false
    }

    private func addBorder() {
        if isEnabled {
            addBorder(color: style.borderColor, width: style.borderWidth)
        } else {
            addBorder(color: style.borderColorDisabled, width: style.borderWidthDisabled)
        }
    }

    private func addBorder(color: UIColor, width: CGFloat = 1.0) {
        layer.borderColor = color.cgColor
        layer.borderWidth = width
    }
}