//
//  CustomEmojiImageView.swift
//  Tusker
//
//  Created by Shadowfacts on 10/11/20.
//  Copyright © 2020 Shadowfacts. All rights reserved.
//

import SwiftUI
import Pachyderm

struct CustomEmojiImageView: View {
    let emoji: Emoji
    @State private var request: ImageCache.Request?
    @State private var image: UIImage?
    
    var body: some View {
        imageView
            .onAppear(perform: self.loadImage)
            .onDisappear(perform: self.cancelRequest)
    }
    
    @ViewBuilder
    private var imageView: some View {
        if let image = image {
            Image(uiImage: image)
                .renderingMode(.original)
                .resizable()
                .aspectRatio(contentMode: .fit)
        } else {
            Image(systemName: "smiley.fill")
        }
    }
    
    private func loadImage() {
        request = ImageCache.emojis.get(emoji.url) { (data) in
            if let data = data, let image = UIImage(data: data) {
                DispatchQueue.main.async {
                    self.request = nil
                    self.image = image
                }
            } else {
                DispatchQueue.main.async {
                    self.request = nil
                }
            }
        }
    }
    
    private func cancelRequest() {
        request?.cancel()
    }
}

//struct CustomEmojiImageView_Previews: PreviewProvider {
//    static var previews: some View {
//        CustomEmojiImageView()
//    }
//}