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

import UIKit
import Pachyderm
import Gifu

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

class AttachmentView: UIImageView, GIFAnimatable {
    
    var delegate: AttachmentViewDelegate?
    
    var attachment: Attachment!
    var gifData: Data?
    
    public lazy var animator: Animator? = Animator(withDelegate: self)
    
    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() {
        ImageCache.attachments.get(attachment.url) { (data) in
            guard let data = data else { return }
            DispatchQueue.main.async {
                if self.attachment.url.pathExtension == "gif" {
                    self.animate(withGIFData: data)
                    self.gifData = data
                } else {
                    self.image = UIImage(data: data)
                }
            }
        }
    }
    
    override func display(_ layer: CALayer) {
        updateImageIfNeeded()
    }
    
    @objc func imagePressed() {
        if image != nil {
            delegate?.showLargeAttachment(for: self)
        }
    }

}