//
//  SegmentedReliefButton.swift
//  App
//
//  Created by James Magahern on 8/14/20.
//

import UIKit

class SegmentedReliefButton: ReliefButton
{
    var children: [ReliefButton] = [] {
        willSet { children.forEach { $0.removeFromSuperview() } }
        didSet  { children.forEach { addSubview($0) }; setNeedsLayout() }
    }
    
    init(children: [ReliefButton]) {
        super.init()
        self.children = children
    }
    
    override var isHighlighted: Bool {
        didSet {}
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func sizeThatFits(_ size: CGSize) -> CGSize {
        let width: CGFloat = children.reduce(0.0) { (result, button) -> CGFloat in
            return result + button.sizeThatFits(size).width
        }
        
        return CGSize(width: width, height: size.height)
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        backgroundView.frame = bounds
        shadowView.frame = bounds
        
        var buttonRect = CGRect(origin: .zero, size: CGSize(width: 0, height: bounds.height))
        for child in children {
            child.shadowView.isHidden = true
            child.backgroundView.layer.borderWidth = 0
            bringSubviewToFront(child)
            
            let childSize = child.sizeThatFits(bounds.size)
            buttonRect.size = CGSize(width: childSize.width, height: bounds.height)
            child.frame = buttonRect
            
            buttonRect.origin.x += buttonRect.width
        }
    }
}