import SwiftUI

struct LoginView: View {
    @ObservedObject var auth: AuthStore
    @ObservedObject var settings: SettingsStore
    @State private var username = ""
    @State private var password = ""
    @State private var server = ""
    @State private var serverError: String?
    var body: some View {
        NavigationStack {
            Form {
                Section {
                    Text("Sign in to Hope").font(.title2.bold())
                    Text("Use the account provided by your server administrator. Hermes is managed by your server.")
                        .foregroundStyle(.secondary)
                }
                Section("Account") {
                    TextField("Username", text: $username).textContentType(.username)
                        .textInputAutocapitalization(.never).autocorrectionDisabled()
                    SecureField("Password", text: $password).textContentType(.password)
                    Button("Sign in") {
                        let suppliedPassword = password
                        password = ""
                        Task { await auth.login(username: username, password: suppliedPassword) }
                    }
                    .disabled(auth.isBusy || username.isEmpty || password.isEmpty)
                    if auth.isBusy { ProgressView("Signing in…") }
                    if let error = auth.error { Text(error).foregroundStyle(.red) }
                }
                Section("Server") {
                    TextField("HTTPS server address", text: $server).keyboardType(.URL)
                        .textInputAutocapitalization(.never).autocorrectionDisabled()
                    Button("Save server address") {
                        switch ServerConfig.parse(server) {
                        case .success(let config): settings.serverURL = config.baseURL.absoluteString
                        case .failure(let error): serverError = error.localizedDescription
                        }
                    }.disabled(auth.isBusy)
                    if let serverError { Text(serverError).foregroundStyle(.red) }
                    Text("Connections use HTTPS and secure WebSockets. A private server certificate may require an installed, trusted CA on this iPhone.")
                        .font(.footnote).foregroundStyle(.secondary)
                }
            }
            .navigationTitle("Hope")
            .onAppear { server = settings.serverURL }
        }
    }
}

struct AuthenticationRoot: View {
    @ObservedObject var settings: SettingsStore
    @State private var auth: AuthStore
    @State private var replacement: Task<Void, Never>?
    init(settings: SettingsStore) {
        self.settings = settings
        _auth = State(initialValue: Self.makeAuth(settings))
    }
    private static func makeAuth(_ settings: SettingsStore) -> AuthStore {
        guard case .success(let config) = ServerConfig.parse(settings.serverURL) else { preconditionFailure("Invalid configured origin") }
        #if DEBUG
        if ProcessInfo.processInfo.arguments.contains("--ui-testing"), !ProcessInfo.processInfo.arguments.contains("--live-testing") {
            return AuthStore(config: config, tokens: MemoryTokenStore(), fixture: true)
        }
        #endif
        return AuthStore(config: config)
    }
    var body: some View {
        RootContent(settings: settings, auth: auth)
            .task(id: auth.config.baseURL) { await auth.restore() }
            .onChange(of: settings.serverURL) { _, _ in
                guard !auth.fixture else { return }
                guard replacement == nil else { return }
                replacement = Task { @MainActor in
                    await auth.logout { await auth.disconnectAccount?() }
                    guard !Task.isCancelled else { return }
                    // Read latest origin after teardown; intermediate edits never
                    // restore credentials or connect an intermediate account.
                    auth = Self.makeAuth(settings)
                    replacement = nil
                }
            }
    }
}
private struct RootContent: View {
    @ObservedObject var settings: SettingsStore
    @ObservedObject var auth: AuthStore
    var body: some View {
        if let user = auth.user {
            ConversationView(settings: settings, auth: auth, user: user, bearerToken: auth.token ?? "")
                .id(auth.config.baseURL.absoluteString + ":" + user.id)

        } else {
            LoginView(auth: auth, settings: settings)
        }
    }
}