//
//  ImageCell.swift
//  PaiAi
//
//  Created by zhengjianfei on 16/4/9.
//  Copyright © 2016年 FFIB. All rights reserved.
//

import UIKit
import PaiaiDataKit
import PaiaiUIKit

final class ImageCell: UICollectionViewCell, UIScrollViewDelegate {
    @IBOutlet weak var scrollView: UIScrollView!
    var photoImage = UIImageView()

    func setModel(url: String) {
        photoImage.frame = CGRect(x: 0, y: 0, width: width, height: height)
        photoImage.contentMode = .scaleAspectFit
        scrollView.contentSize = size
        scrollView.addSubview(photoImage)
        
        photoImage.setImage(url, placeholder: UIImage.photoPlaceholder)

        let tapGr = UITapGestureRecognizer(target: self, action: #selector(ImageCell.doubleTap(_:)))
        tapGr.numberOfTapsRequired = 2
        scrollView.addGestureRecognizer(tapGr)
    }

    func viewForZooming(in scrollView: UIScrollView) -> UIView? {
        return photoImage
    }
    //MARK zoom
    @objc func doubleTap(_ gr: UITapGestureRecognizer) {
        if scrollView.zoomScale > scrollView.minimumZoomScale {
            scrollView.setZoomScale(scrollView.minimumZoomScale, animated: true)
        } else {
            //Zoom to rect
            let tapPt = gr.location(in: scrollView)
            var zoomRect = CGRect.zero
            zoomRect.size.width = frame.width / scrollView.maximumZoomScale
            zoomRect.size.height = frame.height / scrollView.maximumZoomScale
            zoomRect.origin.x = tapPt.x - zoomRect.width / 2
            zoomRect.origin.y = tapPt.y - zoomRect.height / 2
            if zoomRect.origin.x < 0 {
                zoomRect.origin.x = 0
            } else if zoomRect.maxX > photoImage.frame.maxX {
                let delta = zoomRect.maxX - photoImage.frame.maxX
                zoomRect.origin.x -= delta
            }
            if zoomRect.origin.y < 0 {
                zoomRect.origin.y = 0
            } else if zoomRect.maxY > photoImage.frame.maxY {
                let delta = zoomRect.maxY - photoImage.frame.maxY
                zoomRect.origin.y -= delta
            }
            scrollView.zoom(to: zoomRect, animated: true)
        }
    }

    override func prepareForReuse() {
        super.prepareForReuse()
        scrollView.zoomScale = 1
    }
}