//
//  AttachmentView.swift
//  Tusker
//
//  Created by Shadowfacts on 8/31/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit
import MastodonKit

protocol AttachmentViewDelegate {
    func showLargeAttachment(for attachmentView: AttachmentView)
}

class AttachmentView: UIImageView {
    
    var delegate: AttachmentViewDelegate?
    
    var attachment: Attachment!
    
    var task: URLSessionDataTask?
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }
    
    convenience init(frame: CGRect, attachment: Attachment) {
        self.init(frame: frame)
        self.attachment = attachment
        loadImage()
    }
    
    func commonInit() {
        contentMode = .scaleAspectFill
        layer.masksToBounds = true
        isUserInteractionEnabled = true
        addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(imagePressed)))
    }
    
    func loadImage() {
        guard let url = URL(string: attachment.url) else { fatalError("Invalid URL: \(attachment.url)") }
        task = URLSession.shared.dataTask(with: url) { data, response, error in
            guard error == nil, let data = data, let image = UIImage(data: data) else { return }
            DispatchQueue.main.async {
                self.image = image
            }
        }
        task!.resume()
    }
    
    @objc func imagePressed() {
        if image != nil {
            delegate?.showLargeAttachment(for: self)
        }
    }

}