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//
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// SignInView.swift
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// Snail
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//
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import SwiftUI
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/// Вход в два шага: адрес почты → одноразовый код из письма.
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struct SignInView: View {
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@Environment(AuthStore.self) private var auth
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private enum Step {
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case email
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case code
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}
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private enum Field {
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case email
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case code
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}
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/// Длина кода и пауза перед повторной отправкой (совпадают с настройками better-auth по умолчанию).
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private static let codeLength = 6
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private static let resendDelay: TimeInterval = 60
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@AppStorage("lastSignInEmail") private var rememberedEmail = ""
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@State private var step: Step = .email
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@State private var email = ""
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@State private var code = ""
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@State private var isLoading = false
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@State private var errorMessage: String?
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@State private var resendAvailableAt = Date.distantPast
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@FocusState private var focusedField: Field?
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private var trimmedEmail: String {
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email.trimmingCharacters(in: .whitespacesAndNewlines)
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}
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private var isEmailValid: Bool {
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trimmedEmail.wholeMatch(of: /[^@\s]+@[^@\s]+\.[^@\s]+/) != nil
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}
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var body: some View {
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NavigationStack {
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Form {
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switch step {
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case .email:
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emailSection
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case .code:
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codeSection
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}
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}
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.navigationTitle(step == .email ? "Вход" : "Код из письма")
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.scrollDismissesKeyboard(.interactively)
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.disabled(isLoading)
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.animation(.default, value: step)
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.onAppear {
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if email.isEmpty { email = rememberedEmail }
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focusedField = .email
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}
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}
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}
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// MARK: - Шаг 1: почта
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@ViewBuilder
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private var emailSection: some View {
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Section {
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TextField("Электронная почта", text: $email, prompt: Text(verbatim: "name@example.com"))
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.textContentType(.emailAddress)
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.keyboardType(.emailAddress)
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.textInputAutocapitalization(.never)
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.autocorrectionDisabled()
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.submitLabel(.continue)
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.focused($focusedField, equals: .email)
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.onSubmit(sendCode)
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.onChange(of: email) { errorMessage = nil }
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} footer: {
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footer(hint: "Мы отправим на этот адрес одноразовый код для входа.")
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}
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Section {
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Button(action: sendCode) {
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ProgressButtonLabel(title: "Получить код", isLoading: isLoading)
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}
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.disabled(!isEmailValid)
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}
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}
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// MARK: - Шаг 2: код
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@ViewBuilder
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private var codeSection: some View {
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Section {
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TextField("Код", text: $code, prompt: Text(verbatim: String(repeating: "0", count: Self.codeLength)))
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.textContentType(.oneTimeCode)
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.keyboardType(.numberPad)
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.font(.title2.monospacedDigit())
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.focused($focusedField, equals: .code)
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.onChange(of: code) { _, newValue in
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// Оставляем только цифры и отправляем, как только код введён полностью
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// (в том числе при автозаполнении из письма).
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let digits = String(newValue.filter(\.isNumber).prefix(Self.codeLength))
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if digits != newValue {
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code = digits
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return
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}
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if !digits.isEmpty { errorMessage = nil }
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if digits.count == Self.codeLength { verifyCode() }
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}
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} footer: {
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footer(hint: "Код отправлен на \(trimmedEmail). Если письма нет, проверьте папку «Спам».")
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}
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Section {
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Button(action: verifyCode) {
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ProgressButtonLabel(title: "Войти", isLoading: isLoading)
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}
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.disabled(code.count != Self.codeLength)
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TimelineView(.periodic(from: .now, by: 1)) { context in
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let remaining = Int(resendAvailableAt.timeIntervalSince(context.date).rounded(.up))
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Button(action: sendCode) {
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if remaining > 0 {
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Text("Отправить повторно через \(remaining) с")
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} else {
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Text("Отправить код повторно")
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}
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}
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.disabled(remaining > 0)
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}
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Button("Изменить адрес почты") {
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code = ""
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errorMessage = nil
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step = .email
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focusedField = .email
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}
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}
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}
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@ViewBuilder
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private func footer(hint: LocalizedStringKey) -> some View {
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if let errorMessage {
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Label(errorMessage, systemImage: "exclamationmark.circle")
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.foregroundStyle(.red)
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} else {
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Text(hint)
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}
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}
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// MARK: - Действия
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private func sendCode() {
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guard isEmailValid, !isLoading else { return }
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Task {
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await perform {
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try await auth.sendCode(to: trimmedEmail)
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rememberedEmail = trimmedEmail
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resendAvailableAt = .now.addingTimeInterval(Self.resendDelay)
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code = ""
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step = .code
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focusedField = .code
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}
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}
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}
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private func verifyCode() {
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guard code.count == Self.codeLength, !isLoading else { return }
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Task {
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await perform {
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try await auth.signIn(email: trimmedEmail, code: code)
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}
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if errorMessage != nil {
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code = ""
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focusedField = .code
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}
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}
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}
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private func perform(_ action: () async throws -> Void) async {
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isLoading = true
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errorMessage = nil
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defer { isLoading = false }
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do {
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try await action()
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} catch {
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errorMessage = error.localizedDescription
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if case APIError.server(_, "TOO_MANY_ATTEMPTS", _) = error {
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// Код больше не примут — сразу разрешаем запросить новый.
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resendAvailableAt = .distantPast
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}
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AccessibilityNotification.Announcement(error.localizedDescription).post()
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}
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}
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}
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/// Подпись кнопки с индикатором загрузки, не меняющая ширину строки.
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private struct ProgressButtonLabel: View {
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let title: LocalizedStringKey
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let isLoading: Bool
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var body: some View {
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HStack {
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Text(title)
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Spacer()
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if isLoading {
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ProgressView()
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}
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}
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.accessibilityElement(children: .combine)
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.accessibilityValue(isLoading ? Text("Загрузка") : Text(verbatim: ""))
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}
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}
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#Preview {
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SignInView()
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.environment(AuthStore(state: .signedOut))
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}
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