//
//  RankingTableViewCell.swift
//  PhotoRank
//
//  Created by Shadowfacts on 8/29/19.
//  Copyright © 2019 Shadowfacts. All rights reserved.
//

import UIKit
import Photos

class RankingTableViewCell: UITableViewCell {
    
    @IBOutlet weak var assetImageView: UIImageView!
    @IBOutlet weak var scoreLabel: UILabel!
    @IBOutlet weak var favoriteButton: UIButton!
    
    var assetIdentifier: String?
    
    override func awakeFromNib() {
        super.awakeFromNib()
        
        assetImageView.layer.masksToBounds = true
        assetImageView.layer.cornerRadius = 8
    }

    func updateUI(asset: PHAsset, score: Int) {
        self.assetIdentifier = asset.localIdentifier
        
        PhotosHelper.requestThumbnail(for: asset, targetSize: assetImageView.bounds.size) { (image) in
            guard self.assetIdentifier == asset.localIdentifier else { return }
            self.assetImageView.image = image
        }
        
        scoreLabel.text = "Score: \(score)"
        
        updateFavoriteButton(favorited: asset.isFavorite)
    }
    
    private func updateFavoriteButton(favorited: Bool) {
        let name = favorited ? "heart.fill" : "heart"
        let image = UIImage(systemName: name)
        favoriteButton.setImage(image, for: .normal)
    }
    
    @IBAction func favoriteButtonPressed() {
        let generator = UINotificationFeedbackGenerator()
        generator.prepare()

        guard let assetIdentifier = assetIdentifier else {
            generator.notificationOccurred(.error)
            return
        }
        let result = PHAsset.fetchAssets(withLocalIdentifiers: [assetIdentifier], options: nil)
        guard result.count == 1 else {
            generator.notificationOccurred(.error)
            return
        }
        let asset = result.object(at: 0)
        

        PHPhotoLibrary.shared().performChanges({
            let request = PHAssetChangeRequest(for: asset)
            request.isFavorite = !asset.isFavorite
        }) { (success, error) in
            if success {
                generator.notificationOccurred(.success)
                DispatchQueue.main.async {
                    guard self.assetIdentifier == assetIdentifier else { return }
                    self.updateFavoriteButton(favorited: !asset.isFavorite)
                }
            } else {
                generator.notificationOccurred(.error)
                print("Error ocurred changing favorite: \(String(describing: error))")
            }
        }
    }
    
}