.swift

//
//  ContentView.swift
//  RoutingDemo
//
//  Created by Mohammad Azam on 1/13/21.
//

import SwiftUI

extension View {
    func toAnyView() -> AnyView {
        return AnyView(self)
    }
}

enum Route {
    case detail(String)
    case aboutUs
    case addCountry
}

class Navigator {
    static func navigate<T: View>(_ route: Route, content: () -> T) -> AnyView {
        
        switch route {
            case .detail(let country):
            
                return
                    NavigationLink(
                        destination: DetailView(country: country)) {
                        content()
                    }.toAnyView()
            
            case .aboutUs:
                return Text("About Us").toAnyView()
            
            case .addCountry:
                return Text("Add Country").toAnyView()
                    
            
        }
    }
}


struct ContentView: View {
    
    let countries = ["Pakistan", "United States", "Canada", "Iceland", "Thailand", "England", "Australia"]
    
    var body: some View {
        NavigationView {
            VStack {
                
                Button(action: {}, label: {
                    Navigator.navigate(.detail("USA"), content: {
                        Text("GO")
                    })
                })
                
                List(countries, id: \.self) { country in
                    Navigator.navigate(.detail(country), content: {
                        Text(country)
                    })
                }.listStyle(PlainListStyle())
                
                .navigationTitle("Countries")
            }
        }
    }
}

struct DetailView: View {
    
    let country: String
    
    var body: some View {
        Text(country)
            .font(.largeTitle)
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}