//
//  UIScrollViewExt.swift
//  PaiAi
//
//  Created by mac on 16/8/10.
//  Copyright © 2016年 FFIB. All rights reserved.
//

import UIKit

extension UIScrollView {

    func buildImageViews(_ imagenames: [String], width: CGFloat, height: CGFloat, spacing: CGFloat, topSpcing: CGFloat, block: setBlock) {
        self.subviews.forEach {$0.removeFromSuperview()}
        var lastImageView: UIImageView? = nil
        imagenames.forEach {
            let imageView = UIImageView().useAutoLayout()
            if  $0.hasPrefix("http") {
                    imageView.setImageWithNullableURL($0, placeholderImage: defaultAvatar)
            } else if !$0.isEmpty {
                imageView.image = UIImage(named: $0)
            } else {
                imageView.image = defaultAvatar
            }

            imageView.cornerRadius = 4
            self.addSubview(imageView)
            block(imageView)
            if lastImageView == nil {
                NSLayoutConstraint.constraints(withVisualFormat: "H:|-\(spacing)-[img(\(width))]", options: [], metrics: nil, views: ["img": imageView]).autolayoutInstall()
                NSLayoutConstraint.constraints(withVisualFormat: "V:|-\(topSpcing)-[img(\(height))]-0-|", options: [], metrics: nil, views: ["img": imageView]).autolayoutInstall()
            } else {
                NSLayoutConstraint.constraints(withVisualFormat: "H:[last]-\(spacing)-[img(\(width))]", options: [], metrics: nil, views: ["img": imageView, "last": lastImageView!]).autolayoutInstall()
                NSLayoutConstraint.constraints(withVisualFormat: "V:|-\(topSpcing)-[img(\(height))]-\(topSpcing)-|", options: [], metrics: nil, views: ["img": imageView]).autolayoutInstall()
            }
            lastImageView = imageView
        }
        if lastImageView != nil {
            NSLayoutConstraint.constraints(withVisualFormat: "H:[img(\(width))]-\(spacing)-|", options: [], metrics: nil, views: ["img": lastImageView!]).autolayoutInstall()
        }
    }
}