import SwiftUI
import Combine

class MyDatabase: BindableObject {
    let didChange = PassthroughSubject<MyDatabase, Never>()

    var contacts: [Contact] = [
        Contact(id: 1, name: "Anna"), Contact(id: 2, name: "Beto"),
        Contact(id: 3, name: "Jack"), Contact(id: 4, name: "Sam")
    ] {
        didSet {
            didChange.send(self)
        }
    }

    struct Contact {
        var id: Int
        var name: String
    }
}

struct ContactsList: View {
    @EnvironmentObject private var database: MyDatabase

    var body: some View {
        NavigationView {
            List($database.contacts.identified(by: \.value.id)) { contact in
                NavigationButton(destination: ContactDetail(contact: contact)) {
                    Text(verbatim: contact.value.name)
                }
            }
            .navigationBarTitle(Text("Contacts"))
        }
    }
}

struct ContactDetail: View {
    @Binding var contact: MyDatabase.Contact

    var body: some View {
        VStack {
        	TextField($contact[\.name])
                .textFieldStyle(.roundedBorder)
                .font(.title)
                .padding()
            Spacer()
        }
        .navigationBarTitle(Text("Edit"), displayMode: .inline)
    }
}