//
//  GroupDetailMemeberView.swift
//  Paiai_iOS
//
//  Created by FFIB on 2019/2/18.
//  Copyright © 2019 FFIB. All rights reserved.
//

import UIKit

class GroupDetailMemeberView: UIView {
    var avatars = [String]() {
        didSet {
            constructViewHierarchy()
            activateConstraints()
        }
    }
    
    private var imageViews = [UIImageView]()
    private var visiableMembersCount = 0
    private var space: CGFloat = 0
    
    override func didMoveToWindow() {
        visiableMembersCount = Int((width - 6) / 46)
        space = (width - CGFloat(40 * visiableMembersCount)) / CGFloat(visiableMembersCount + 1)
    }
    
    func constructViewHierarchy() {
        imageViews.forEach { $0.removeFromSuperview() }
        imageViews.removeAll()
        
        
        for avatar in avatars {
            let imageView = UIImageView()
            
            imageView.cornerRadius = 5
            imageView.setImage(avatar, placeholder: UIImage.defaultAvatar)
            
            addSubview(imageView)
            imageViews.append(imageView)
        }
    }
    
    func activateConstraints() {
        var last: UIImageView?
        for imageView in imageViews {
            imageView.translatesAutoresizingMaskIntoConstraints = false
            
            NSLayoutConstraint.activate([
                imageView.widthAnchor.constraint(equalToConstant: 40),
                imageView.heightAnchor.constraint(equalToConstant: 40),
                imageView.centerYAnchor.constraint(equalTo: centerYAnchor),
                imageView.leadingAnchor.constraint(equalTo: last?.trailingAnchor ?? leadingAnchor, constant: space)
            ])
            
            last = imageView
        }
    }
}