//
//  ContentView.swift
//  Leganto
//
//  Created by Louis Hollingworth on 2023-05-21.
//

import SwiftUI
import CoreData

struct ContentView: View {
    @Environment(\.managedObjectContext) var moc
    @FetchRequest(sortDescriptors: [SortDescriptor(\.name)], animation: .default) var feeds: FetchedResults<Feed>
    
    @State private var showAddScreen = false

    var body: some View {
        NavigationView {
            List {
                ForEach(feeds) { item in
                    NavigationLink {
                        FeedView(feedURL: URL(string: item.url!)!, feedName: item.name!)
                    } label: {
                        HStack {
                            if Genre(rawValue: item.genre) == .news {
                                Image(systemName: "newspaper")
                            } else if Genre(rawValue: item.genre) == .technology {
                                Image(systemName: "laptopcomputer")
                            } else {
                                Image(systemName: "doc")
                            }
                            
                            Text(item.name!)
                        }
                    }
                }
                .onDelete(perform: deleteItems)
            }
                .navigationTitle("feeds")
                .toolbar {
                    ToolbarItem {
                        Button(action: {
                            showAddScreen.toggle()
                        }) {
                            Label("add", systemImage: "plus")
                        }
                    }
                }
                .sheet(isPresented: $showAddScreen) {
                    AddFeed()
                }
        }
    }
    
    func deleteItems(offsets: IndexSet) {
        withAnimation {
            offsets.map { feeds[$0] }.forEach(moc.delete)
            
            do {
                try moc.save()
            } catch {
                let err = error as NSError
                fatalError("Unresolved error \(err), \(err.userInfo)")
            }
        }
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
            .environment(\.managedObjectContext, DataController.preview.container.viewContext)
    }
}