//
//  InstanceTableViewCell.swift
//  Tusker
//
//  Created by Shadowfacts on 9/15/19.
//  Copyright © 2019 Shadowfacts. All rights reserved.
//

import UIKit
import Pachyderm

protocol InstanceTableViewCellDelegate {
    func didSelectInstance(_ instance: Instance)
    func didSelectInstance(_ instance: InstanceSelector.Instance)
}

class InstanceTableViewCell: UITableViewCell {

    var delegate: InstanceTableViewCellDelegate?
    
    @IBOutlet weak var thumbnailImageView: UIImageView!
    @IBOutlet weak var domainLabel: UILabel!
    @IBOutlet weak var adultLabel: UILabel!
    @IBOutlet weak var descriptionLabel: ContentLabel!
    
    var instance: Instance?
    var selectorInstance: InstanceSelector.Instance?
    
    var thumbnailURL: URL?
    
    override func awakeFromNib() {
        super.awakeFromNib()
        
        thumbnailImageView.layer.masksToBounds = true
        thumbnailImageView.layer.cornerRadius = 5
        
        adultLabel.layer.masksToBounds = true
        adultLabel.layer.cornerRadius = 0.5 * adultLabel.bounds.height
    }
    
    func updateUI(instance: InstanceSelector.Instance) {
        self.selectorInstance = instance
        self.instance = nil
        
        domainLabel.text = instance.domain
        adultLabel.isHidden = instance.category != .adult
        descriptionLabel.setTextFromHtml(instance.description)
        updateThumbnail(url: instance.proxiedThumbnailURL)
    }
    
    func updateUI(instance: Instance) {
        self.instance = instance
        self.selectorInstance = nil

        domainLabel.text = URLComponents(string: instance.uri)?.host ?? instance.uri
        adultLabel.isHidden = true
        descriptionLabel.setTextFromHtml(instance.description)
        
        if let thumbnail = instance.thumbnail {
            updateThumbnail(url: thumbnail)
        } else {
            thumbnailImageView.image = nil
        }
    }
    
    private func updateThumbnail(url: URL) {
        thumbnailImageView.image = nil
        thumbnailURL = url
        ImageCache.attachments.get(url) { (data) in
            guard self.thumbnailURL == url, let data = data, let image = UIImage(data: data) else { return }
            DispatchQueue.main.async {
                self.thumbnailImageView.image = image
            }
        }
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        if selected, let delegate = delegate {
            if let instance = instance {
                delegate.didSelectInstance(instance)
            } else if let instance = selectorInstance {
                delegate.didSelectInstance(instance)
            }
        }
    }
    
}