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

import UIKit
import Pachyderm
import WebKit

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

class AttachmentView: UIImageView {
    
    var delegate: AttachmentViewDelegate?
    
    var attachment: Attachment!
    
    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 {
                // TODO: error icon
                return
            }
            
            // TODO: better way of detecting gifs
            if self.attachment.url.pathExtension == "gif" {
                DispatchQueue.main.async {
                    // I hate this; this is awful
                    let webView = WKWebView(frame: self.bounds)
                    webView.isUserInteractionEnabled = false
                    webView.backgroundColor = .clear
                    webView.isOpaque = false
                    webView.load(data, mimeType: "image/gif", characterEncodingName: "utf-8", baseURL: self.attachment.url)
                    self.addSubview(webView)
                }
            } else {
                DispatchQueue.main.async {
                    self.image = UIImage(data: data)
                }
            }
        }
    }
    
    @objc func imagePressed() {
        if image != nil {
            delegate?.showLargeAttachment(for: self)
        }
    }
    
}