//
//  ComposeAttachmentView.swift
//  Tusker
//
//  Created by Shadowfacts on 1/10/19.
//  Copyright © 2019 Shadowfacts. All rights reserved.
//

import UIKit
import Photos
import AVFoundation

protocol ComposeMediaViewDelegate {
    func didRemoveMedia(_ mediaView: ComposeMediaView)
}

class ComposeMediaView: UIView {

    var delegate: ComposeMediaViewDelegate?
    
    @IBOutlet weak var imageView: UIImageView!
    @IBOutlet weak var descriptionTextView: UITextView!
    @IBOutlet weak var placeholderLabel: UILabel!
    
    var attachment: CompositionAttachment!
    
    static func create() -> ComposeMediaView {
        return UINib(nibName: "ComposeMediaView", bundle: nil).instantiate(withOwner: nil, options: nil).first as! ComposeMediaView
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        
        imageView.layer.masksToBounds = true
        imageView.layer.cornerRadius = 10 // 0.1 * imageView.frame.width
        
        descriptionTextView.delegate = self
    }
    
    func update(attachment: CompositionAttachment) {
        self.attachment = attachment
        
        switch attachment {
        case let .image(image):
            imageView.image = image
        case let .asset(asset):
            let size = CGSize(width: 80, height: 80)
            PHImageManager.default().requestImage(for: asset, targetSize: size, contentMode: .aspectFill, options: nil) { (image, _) in
                guard self.attachment == attachment else { return }
                self.imageView.image = image
            }
        case let .video(url):
            let asset = AVURLAsset(url: url)
            let imageGenerator = AVAssetImageGenerator(asset: asset)
            if let cgImage = try? imageGenerator.copyCGImage(at: .zero, actualTime: nil) {
                imageView.image = UIImage(cgImage: cgImage)
            }
        }
    }
    
    // MARK: - Interaction
    
    @IBAction func removePressed(_ sender: Any) {
        delegate?.didRemoveMedia(self)
    }
    
}

extension ComposeMediaView: UITextViewDelegate {
    func textViewDidChange(_ textView: UITextView) {
        placeholderLabel.isHidden = !descriptionTextView.text.isEmpty
    }
}