LeCountdown/LeCountdown/ContentView.swift

//
//  ContentView.swift
//  LeCountdown
//
//  Created by Laurent Morvillier on 20/01/2023.
//

import SwiftUI
import CoreData

struct ContentView: View {
    @Environment(\.managedObjectContext) private var viewContext

    @FetchRequest(
        sortDescriptors: [NSSortDescriptor(keyPath: \Countdown.order, ascending: true)],
        animation: .default)
    private var countdowns: FetchedResults<Countdown>
    
    fileprivate let itemSpacing: CGFloat = 10.0

    @State private var isShowingNewCountdown = false
    
    private var columns: [GridItem] = [
        GridItem(spacing: 10.0),
        GridItem(spacing: 10.0),
    ]
    
    var body: some View {
        
        NavigationStack {
            
            LazyVGrid(
                columns: columns,
                spacing: itemSpacing
            ) {
                
                ForEach(countdowns) { item in
                    NavigationLink {
                        Text("Item at \(item.order)")
                    } label: {
                        Text(item.duration.minuteSecond)
                            .aspectRatio(contentMode: .fill)
                            .frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity)
                            .aspectRatio(1, contentMode: .fit)
                            .background(Color(red: 0.9, green: 0.95, blue: 1.0))
                            .cornerRadius(40.0)
                    }.onAppear {
                        
                    }
                }
                
            }.padding(itemSpacing)
            .navigationTitle("Youpi")
            .sheet(isPresented: self.$isShowingNewCountdown, content: {
                NewCountdownView(isPresented: $isShowingNewCountdown)       .environment(\.managedObjectContext, viewContext)
            })
            .toolbar {
                ToolbarItemGroup(placement: .bottomBar) {
                    Button {
                        self.isShowingNewCountdown = true
                    } label: {
                        Image(systemName: "plus")
                    }
                }
            }
        }
        
    }

}

private let itemFormatter: DateFormatter = {
    let formatter = DateFormatter()
    formatter.dateStyle = .short
    formatter.timeStyle = .medium
    return formatter
}()

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