//
//  FeedView.swift
//  tst
//
//  Created by Vitaly Takmazov on 10.12.2019.
//  Copyright © 2019 com.juick. All rights reserved.
//

import SwiftUI

struct FeedView: View {
    @ObservedObject var messageFetcher : MessageFetcher
    
    let title: String
    
    init(_ title: String, url: String) {
        self.title = title
        messageFetcher = MessageFetcher(url: url)
    }
    
    private var stateContent: AnyView {
        switch messageFetcher.state {
        case .loading:
            return AnyView(
                ProgressView()
            )
        case .fetched(let result):
            switch result {
            case .failure(let error):
                return AnyView(
                    Text(error.localizedDescription)
                )
            case .success(let root):
                return AnyView(
                    List(root) { (message: Message) in
                        MessageView(message: message)
                    }
                )
            }
        }
    }
    
    var body: some View {
        NavigationView {
            stateContent
                .navigationBarTitle(Text(title), displayMode: .inline)
        }
    }
}

struct FeedView_Previews: PreviewProvider {
    static var previews: some View {
        FeedView("Discover", url: "https://api.juick.com/messages")
    }
}