import SwiftUI

struct LoginView: View {
    @EnvironmentObject private var session: Session

    @State private var server: String = Session.shared.baseURL?.absoluteString ?? ""
    @State private var username = ""
    @State private var password = ""
    @State private var error: String?
    @State private var busy = false
    @State private var stayLoggedIn = Session.shared.stayLoggedIn

    var body: some View {
        NavigationStack {
            Form {
                Section("Server") {
                    TextField("http://192.168.1.10:8080", text: $server)
                        .textInputAutocapitalization(.never)
                        .autocorrectionDisabled()
                        .keyboardType(.URL)
                }
                Section("Anmeldung") {
                    TextField("Benutzername", text: $username)
                        .textInputAutocapitalization(.never)
                        .autocorrectionDisabled()
                    SecureField("Passwort", text: $password)
                    Toggle("Angemeldet bleiben", isOn: $stayLoggedIn)
                }
                if !stayLoggedIn {
                    Section {
                        Text("Die Anmeldung gilt nur, solange die App geoeffnet ist.")
                            .font(.caption).foregroundStyle(.secondary)
                    }
                }
                if let error {
                    Section { Text(error).foregroundStyle(.red).font(.callout) }
                }
                Section {
                    Button(busy ? "Anmelden…" : "Anmelden") { Task { await login() } }
                        .disabled(busy || server.isEmpty || username.isEmpty)
                }
            }
            .navigationTitle("Vorrania")
        }
    }

    private func login() async {
        error = nil
        busy = true
        defer { busy = false }
        session.setServer(server)
        do {
            let token = try await APIClient.shared.login(username: username, password: password)
            session.store(token: token.accessToken, username: token.username,
                          isAdmin: token.role == "admin", persist: stayLoggedIn)
        } catch {
            self.error = error.localizedDescription
        }
    }
}