import SwiftUI
import FirebaseAuth
import FirebaseFirestore
import Firebase

struct ContentView: View {

    // login e registro
    @State private var email = ""
    @State private var password = ""
    @State private var nomeUsuario = ""

    // controle telas e autenticação
    @State private var usuarioLogado = false
    @State private var botaoRegistrar = false
    @State private var botaoLogout = false

    var body: some View {

        VStack (spacing:15)  {

            // Verifica se usuário está logado
            if !usuarioLogado {

                VStack (spacing:15) {

                    Text("Citie")
                        .font(.largeTitle)

                    TextField("E-mail", text: $email)
                        .autocapitalization()
                        .keyboardType(.emailAddress)
                        .textFieldStyle(.roundedBorder)
                        .multilineTextAlignment(.center)

                    if botaoRegistrar == true {
                        TextField("Usuário", text: $nomeUsuario)
                            .autocapitalization()
                            .textFieldStyle(.roundedBorder)
                            .multilineTextAlignment(.center)
                    }

                    SecureField("Senha", text: $password)
                        .textFieldStyle(.roundedBorder)
                        .multilineTextAlignment(.center)

                    if botaoRegistrar == true {
                        Button("Registrar") {
                            registrar()
                        }
                        .bold()
                        .frame(width:200, height:40)
                        .background(.blue)
                        .foregroundColor(.white)
                        .cornerRadius(10)
                        .shadow(color: .gray, radius: 5)

                        Button("Tenho usuário. Fazer login.") {
                            botaoRegistrar = false
                        }

                    } else {

                        Button("Login") {
                            login()
                        }
                        .bold()
                        .frame(width:200, height:40)
                        .background(.blue)
                        .foregroundColor(.white)
                        .cornerRadius(10)
                        .shadow(color: .gray, radius: 5)

                        Button("Não tenho usuário. Criar Conta.") {
                            botaoRegistrar = true
                        }

                    }
                }
                        .padding()
                        .onAppear{
                            Auth.auth().addStateDidChangeListener {
                                auth, user in
                                if user != nil {
                                    usuarioLogado = true
                                }
                            }
                        }

            }

            else {

                AppPrincipal()

                // acionar esse state no perfil do usuario.
                if botaoLogout {
                    Button("logout")
                    {
                        if logout() == "ok" {
                            usuarioLogado = false
                            email = ""
                            password = ""
                        }
                    }
                }

            }

        }
        .padding()
    }

        func registrar() {
            Auth.auth().createUser(withEmail: email, password: password)  { result, error in
                if error != nil {
                    print(error!.localizedDescription)
                }

                registrarFirestore()

            }
        }

        func registrarFirestore(){
            guard let uid = Auth.auth().currentUser?.uid else { return }
            let userData = ["nomeUsuario":nomeUsuario, "email": email, "uid": uid]
            Firestore.firestore().collection("users")
                .document(uid).setData(userData) { err in
                    if let err = err {
                        print(err)
                        return
                    }
                }
        }

        func login(){
            Auth.auth().signIn(withEmail: email, password: password) { result, error in
                if error != nil {
                    print(error!.localizedDescription)
                }

            }
        }

        func logout() -> String {
            try?
            Auth.auth().signOut()
            return "ok"
        }

    }

#Preview {
    ContentView()
}