### Swift Authentication Service Usage Example

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Demonstrates how to use the `AuthService` protocol with a mock implementation. This example showcases asynchronous sign-in using `async/await`, error handling for different `AuthError` cases, and signing out. It also includes an example of observing session changes using Combine publishers.

```swift
// Usage example with mock service
Task {
    let authService = MockAuthService()

    // Sign in with Apple
    do {
        let session = try await authService.signIn(with: .apple)
        print("Signed in as \(session.displayName) via \(session.provider.displayName)")
        // Output: "Signed in as Jamie Rivera via Apple"
    } catch let error as AuthError {
        switch error {
        case .cancelled: print("User cancelled")
        case .failed(let reason): print("Failed: \(reason ?? \"unknown\")")
        case .timedOut: print("Timeout occurred")
        }
    }

    // Sign out
    await authService.signOut()
    print("Signed out successfully")
}

// Observe session changes with Combine
var cancellables = Set<AnyCancellable>()
authService.sessionPublisher
    .sink {
        session in
        if let session = session {
            print("Session active: \(session.displayName)")
        } else {
            print("No active session")
        }
    }
    .store(in: &cancellables)
```

--------------------------------

### RPButton Component Usage Examples in Swift

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Demonstrates various ways to use the RPButton component in Swift with different variants, sizes, and configurations. Includes examples for primary, secondary with icons, destructive, link styles, and disabled states.

```swift
// Usage examples
VStack(spacing: .rpSpaceM) {
    // Primary action button
    RPButton("Continue", variant: .primary, size: .large) {
        print("Primary action")
    }

    // Secondary with icon
    RPButton("Cancel",
             variant: .secondary,
             size: .medium,
             leadingIcon: Image(systemName: "xmark")) {
        print("Cancel action")
    }

    // Destructive action
    RPButton("Delete Account",
             variant: .destructive,
             size: .large) {
        print("Delete action")
    }

    // Link style
    RPButton("Learn More",
             variant: .link,
             size: .small,
             fillsWidth: false) {
        print("Link action")
    }

    // Disabled state
    RPButton("Submit",
             variant: .primary,
             isEnabled: false) {
        print("Won't execute")
    }
}

```

--------------------------------

### RPToast Component Definition and Usage (SwiftUI)

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Defines the RPToast structure for creating toast notifications, including styles and actions. It also includes the RPToastCenter class for managing toast display and provides usage examples for different toast types and scenarios.

```swift
import SwiftUI

public struct RPToast: Identifiable {
    public struct Action {
        public let title: String
        private let handler: () -> Void

        public init(title: String, handler: @escaping () -> Void) {
            self.title = title
            self.handler = handler
        }

        public func perform() { handler() }
    }

    public enum Style {
        case neutral   // Default gray
        case success   // Green/accent color
        case warning   // Orange
        case critical  // Red/danger color
    }

    public let id: UUID
    public let title: String?
    public let message: String
    public let style: Style
    public let action: Action?

    public init(id: UUID = UUID(),
                title: String? = nil,
                message: String,
                style: Style = .neutral,
                action: Action? = nil) {
        self.id = id
        self.title = title
        self.message = message
        self.style = style
        self.action = action
    }
}

// Toast center for managing display
@MainActor
final class RPToastCenter: ObservableObject {
    static let shared = RPToastCenter()
    @Published var currentToast: RPToast?

    func show(_ toast: RPToast, duration: TimeInterval = 3.0) {
        currentToast = toast

        Task {
            try? await Task.sleep(nanoseconds: UInt64(duration * 1_000_000_000))
            if currentToast?.id == toast.id {
                dismiss()
            }
        }
    }

    func dismiss() {
        currentToast = nil
    }
}

// Usage examples
// Success toast
RPToastCenter.shared.show(
    RPToast(
        title: "Success",
        message: "Your changes have been saved",
        style: .success
    ),
    duration: 2.0
)

// Error toast with action
RPToastCenter.shared.show(
    RPToast(
        title: "Connection Error",
        message: "Unable to reach server",
        style: .critical,
        action: RPToast.Action(title: "Retry") {
            print("Retry action")
        }
    ),
    duration: 5.0
)

// Warning toast
RPToastCenter.shared.show(
    RPToast(
        message: "Low battery - save your work",
        style: .warning
    )
)

// Simple info toast
RPToastCenter.shared.show(
    RPToast(message: "Paper copied to clipboard")
)

// Dismiss programmatically
RPToastCenter.shared.dismiss()

```

--------------------------------

### Adaptive Content View Implementation (SwiftUI)

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Demonstrates how to use the AdaptiveLayoutContext within a SwiftUI View to dynamically adapt the layout based on the detected breakpoint. It uses a GeometryReader to get layout information and switches between different view structures (VStack, LazyVGrid) for compact, medium, and expanded breakpoints.

```swift
// Usage in SwiftUI views
struct AdaptiveContentView: View {
    @Environment(\.adaptiveLayoutContext) private var layout

    var body: some View {
        GeometryReader { proxy in
            let context = AdaptiveLayoutContext.resolve(
                proxy: proxy,
                horizontalSizeClass: .regular, // Example values, these would typically come from environment
                verticalSizeClass: .regular
            )

            Group {
                switch context.breakpoint {
                case .compact:
                    // Single column layout for iPhone
                    VStack(spacing: 12) {
                        ForEach(items) { item in // Assuming 'items' is defined elsewhere
                            ItemCard(item: item) // Assuming 'ItemCard' is defined elsewhere
                        }
                    }
                case .medium:
                    // Two column layout for iPad portrait
                    LazyVGrid(columns: [
                        GridItem(.flexible()),
                        GridItem(.flexible())
                    ], spacing: 16) {
                        ForEach(items) { item in
                            ItemCard(item: item)
                        }
                    }
                case .expanded:
                    // Three column layout for iPad landscape
                    LazyVGrid(columns: [
                        GridItem(.flexible()),
                        GridItem(.flexible()),
                        GridItem(.flexible())
                    ], spacing: 20) {
                        ForEach(items) { item in
                            ItemCard(item: item)
                        }
                    }
                }
            }
            .adaptiveContentContainer()
            .environment(\.adaptiveLayoutContext, context)
        }
    }
}

```

--------------------------------

### SwiftUI Color Token System

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Defines a color token system for SwiftUI applications with support for light and dark modes. It uses a TokenStore to map token names to hex color values. Usage examples demonstrate applying these colors to Text and Button elements.

```swift
import SwiftUI

public enum RPColorToken: String {
    case primary = "rpColorPrimary"
    case primaryAlt = "rpColorPrimaryAlt"
    case accent = "rpColorAccent"
    case danger = "rpColorDanger"
    case surface = "rpColorSurface"
    case surfaceAlt = "rpColorSurfaceAlt"
    case textPrimary = "rpColorTextPrimary"
    case textInverse = "rpColorTextInverse"
}

extension Color {
    static func rp(_ token: RPColorToken, scheme: ColorScheme) -> Color {
        let key = scheme == .dark ? "(token.rawValue)Dark" : token.rawValue
        let hex: String = TokenStore.shared.value(for: key) ?? "#CCCCCC"
        return Color(hex: hex)
    }

    // Convenience accessors
    static var rpPrimary: Color { rp(.primary, scheme: .current) }
    static var rpPrimaryAlt: Color { rp(.primaryAlt, scheme: .current) }
    static var rpAccent: Color { rp(.accent, scheme: .current) }
    static var rpDanger: Color { rp(.danger, scheme: .current) }
    static var rpTextPrimary: Color { rp(.textPrimary, scheme: .current) }
    static var rpTextInverse: Color { rp(.textInverse, scheme: .current) }
    static var rpSurface: Color { rp(.surface, scheme: .current) }
    static var rpSurfaceAlt: Color { rp(.surfaceAlt, scheme: .current) }
}

// Usage examples
Text("Primary Text")
    .foregroundColor(.rpPrimary)

Button("Action") { } 
    .background(Color.rpAccent)

VStack {
    Text("Content")
}
.background(Color.rpSurface)
.foregroundColor(.rpTextPrimary)

// Danger state
Text("Error Message")
    .foregroundColor(.rpDanger)
```

--------------------------------

### SwiftUI Spacing Token System

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Provides a spacing token system in SwiftUI using CGFloat values for consistent layout margins and spacing. It defines various predefined spacing constants from xxs to xxl. Usage examples demonstrate applying these spacing tokens to VStack and HStack elements.

```swift
import SwiftUI

public enum RPSpaceToken: CGFloat {
    case xxs = 4
    case xs = 8
    case s = 12
    case m = 16
    case l = 24
    case xl = 32
    case xxl = 48
}

extension CGFloat {
    static var rpSpaceXXS: CGFloat { RPSpaceToken.xxs.rawValue }
    static var rpSpaceXS: CGFloat { RPSpaceToken.xs.rawValue }
    static var rpSpaceS: CGFloat { RPSpaceToken.s.rawValue }
    static var rpSpaceM: CGFloat { RPSpaceToken.m.rawValue }
    static var rpSpaceL: CGFloat { RPSpaceToken.l.rawValue }
    static var rpSpaceXL: CGFloat { RPSpaceToken.xl.rawValue }
    static var rpSpaceXXL: CGFloat { RPSpaceToken.xxl.rawValue }
}

// Usage examples
VStack(spacing: .rpSpaceM) {
    Text("Item 1")
    Text("Item 2")
    Text("Item 3")
}
.padding(.rpSpaceL)

HStack(spacing: .rpSpaceS) {
    Image(systemName: "star.fill")
    Text("Featured")
}
.padding(.horizontal, .rpSpaceXL)
.padding(.vertical, .rpSpaceM)
```

--------------------------------

### SwiftUI Font Token System

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Implements a font token system for SwiftUI applications with support for Dynamic Type. It defines various font styles and weights, making it easy to apply consistent typography. Usage examples show how to set font styles on Text views.

```swift
import SwiftUI

public enum RPFontToken: String {
    case headingL = "rpFontHeadingL"  // 28pt semibold
    case headingM = "rpFontHeadingM"  // 22pt semibold
    case bodyL = "rpFontBodyL"        // 17pt regular
    case bodyM = "rpFontBodyM"        // 15pt regular
    case caption = "rpFontCaption"    // 13pt regular
}

extension Font {
    static var rpHeadingL: Font { .system(size: 28, weight: .semibold, design: .default) }
    static var rpHeadingM: Font { .system(size: 22, weight: .semibold, design: .default) }
    static var rpBodyL: Font { .system(size: 17, weight: .regular, design: .default) }
    static var rpBodyM: Font { .system(size: 15, weight: .regular, design: .default) }
    static var rpCaption: Font { .system(size: 13, weight: .regular, design: .default) }
}

// Usage examples
Text("Large Heading")
    .font(.rpHeadingL)

Text("Medium Heading")
    .font(.rpHeadingM)

Text("Body text with regular weight")
    .font(.rpBodyL)

Text("Smaller body text")
    .font(.rpBodyM)

Text("Caption or metadata")
    .font(.rpCaption)
    .foregroundColor(.secondary)
```

--------------------------------

### SwiftUI App Entry Point Initialization

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Initializes the main SwiftUI application, demonstrating dependency injection for authentication and interface providers. It supports both default initialization with mock services and custom initialization for testing or production environments.

```swift
import SwiftUI

@main
@MainActor
struct RollingPaperApp: App {
    @StateObject private var interfaceProvider: InterfaceProvider
    private let authService: AuthService

    // Default initialization with mock service
    init() {
        self.init(authService: MockAuthService())
    }

    // Custom initialization for testing or production Firebase
    init(authService: AuthService) {
        let provider = InterfaceProvider()
        _interfaceProvider = StateObject(wrappedValue: provider)
        self.authService = authService
    }

    var body: some Scene {
        WindowGroup {
            AppNavigationView(authService: authService)
                .environmentObject(interfaceProvider)
                .interface(interfaceProvider)
        }
    }
}

// Launch the app with custom configuration
@main
struct CustomRollingPaperApp: App {
    var body: some Scene {
        WindowGroup {
            RollingPaperApp(authService: MockAuthService(
                configuration: MockAuthServiceConfiguration(
                    latencyRange: 0.3...0.8,
                    failureProbability: 0.10,
                    cancellationProbability: 0.05,
                    simulatedNames: [
                        .apple: ["Test User", "Demo User"],
                        .google: ["Sample User"]
                    ]
                )
            ))
        }
    }
}
```

--------------------------------

### Swift Mock Authentication Service Implementation

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Implements a mock authentication service using Swift's Combine framework. It simulates user sign-in and sign-out processes with configurable latency, failure rates, and cancellation probabilities. Dependencies include Combine and Foundation. It takes an optional configuration and persistence object, returning a UserSession upon successful sign-in or throwing an AuthError.

```swift
import Combine
import Foundation

struct MockAuthServiceConfiguration: Sendable {
    let latencyRange: ClosedRange<TimeInterval>
    let failureProbability: Double
    let cancellationProbability: Double
    let simulatedNames: [AuthProvider: [String]]

    static let standard = MockAuthServiceConfiguration(
        latencyRange: 0.5...1.2,          // Random delay between 500ms-1200ms
        failureProbability: 0.15,         // 15% chance of failure
        cancellationProbability: 0.05,    // 5% chance of cancellation
        simulatedNames: [
            .apple: ["Jamie Rivera", "Chris Han", "Minseo Kim", "Alex Garcia"],
            .google: ["Jordan Chen", "Taylor Singh", "Yuna Lee", "Owen Park"]
        ]
    )
}

@MainActor
final class MockAuthService: AuthService {
    @Published private var session: UserSession?

    var currentSession: UserSession? { session }
    var sessionPublisher: AnyPublisher<UserSession?, Never> {
        $session.eraseToAnyPublisher()
    }

    private let configuration: MockAuthServiceConfiguration
    private let persistence: SessionPersistence

    init(configuration: MockAuthServiceConfiguration? = nil,
         persistence: SessionPersistence? = nil) {
        self.configuration = configuration ?? .standard
        self.persistence = persistence ?? UserDefaultsSessionPersistence()
        self._session = Published(initialValue: self.persistence.loadSession())
    }

    func signIn(with provider: AuthProvider) async throws -> UserSession {
        // Simulate network latency
        let delay = Double.random(in: configuration.latencyRange)
        try await Task.sleep(nanoseconds: UInt64(delay * 1_000_000_000))

        // Simulate random failures
        let outcome = Double.random(in: 0...1)
        if outcome < configuration.failureProbability {
            throw AuthError.failed()
        }
        if outcome < configuration.failureProbability + configuration.cancellationProbability {
            throw AuthError.cancelled
        }

        // Create successful session
        let names = configuration.simulatedNames[provider] ?? []
        let displayName = names.randomElement() ?? "\(provider.displayName) User"
        let session = UserSession(displayName: displayName, provider: provider)

        self.session = session
        persistence.save(session: session)
        return session
    }

    func signOut() async {
        session = nil
        persistence.clear()
    }
}

// Usage with custom configuration
let quickAuthService = MockAuthService(
    configuration: MockAuthServiceConfiguration(
        latencyRange: 0.1...0.3,        // Fast responses for testing
        failureProbability: 0.0,        // Never fail
        cancellationProbability: 0.0,   // Never cancel
        simulatedNames: [
            .apple: ["Test User"],
            .google: ["Test User"]
        ]
    )
)

Task {
    let session = try await quickAuthService.signIn(with: .google)
    print("Quick login: \(session.displayName)")
}

```

--------------------------------

### Swift Navigation Coordinator with Deep Link Support

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

This Swift code defines a navigation system for an application, including route definitions, a coordinator class for managing navigation state, and deep link handling. It leverages Combine and SwiftUI for reactive programming and UI updates. Dependencies include Combine and SwiftUI frameworks.

```swift
import Combine
import SwiftUI

// Define application routes
enum AppRoute: Hashable {
    case launch
    case auth
    case home
    case paper(PaperRoute)
}

enum PaperRoute: Hashable {
    case create
    case detail(id: String)
    case share(id: String)
}

// Navigation coordinator
final class NavigationCoordinator: ObservableObject {
    @Published var path: [AppRoute] = []
    @Published var presentedPaperRoute: PaperRoute? // Note: This property seems unused in the provided snippet.

    func navigate(to route: AppRoute) {
        path.append(route)
    }

    func reset(to route: AppRoute) {
        path = [route]
    }

    func handle(deepLink url: URL) {
        // Assuming DeepLinkParser is defined elsewhere and returns an AppRoute or nil
        guard let route = DeepLinkParser.parse(url: url) else { return }
        switch route {
        case .launch:
            path = []
        case .auth:
            path = [.auth]
        case .home:
            path = [.home]
        case .paper(let paperRoute):
            path = [.home, .paper(paperRoute)]
        }
    }
}

// Placeholder for DeepLinkParser (must be implemented separately)
class DeepLinkParser {
    static func parse(url: URL) -> AppRoute? {
        // Example parsing logic - replace with actual implementation
        if url.host == "paper" {
            if let id = url.pathComponents.last {
                return .paper(.detail(id: id))
            }
        }
        return nil
    }
}

// Usage example (within a SwiftUI View context)
struct ContentView: View {
    @StateObject var coordinator = NavigationCoordinator()

    var body: some View {
        NavigationView {
            HomeView()
                .navigationDestination(for: AppRoute.self) {
                    route in
                    switch route {
                    case .auth:
                        AuthView()
                    case .home:
                        HomeView()
                    case .paper(let paperRoute):
                        PaperView(route: paperRoute)
                    case .launch:
                        // Handle launch route if necessary, potentially by dismissing presented views
                        EmptyView() // Or some launch screen view
                    }
                }
        }
        .environmentObject(coordinator) // Make coordinator available throughout the environment
        .onOpenURL {
            url in
            coordinator.handle(deepLink: url)
        }
    }
}

// Placeholder views (must be defined separately)
struct HomeView: View {
    var body: some View { Text("Home View") }
}
struct AuthView: View {
    var body: some View { Text("Auth View") }
}
struct PaperView: View {
    let route: PaperRoute
    var body: some View { Text("Paper View: \(route.description)") } // Improved description for PaperRoute
}

extension PaperRoute: CustomStringConvertible {
    var description: String {
        switch self {
        case .create:
            return "Create"
        case .detail(let id):
            return "Detail (ID: \(id))"
        case .share(let id):
            return "Share (ID: \(id))"
        }
    }
}

/*
// Example of how to use the coordinator outside the NavigationView setup:

// Navigate to specific paper
// coordinator.navigate(to: .paper(.detail(id: "paper-123")))

// Reset to home
// coordinator.reset(to: .home)

// Handle deep link (example URL)
// let url = URL(string: "rollingpaper://paper/paper-456")!
// coordinator.handle(deepLink: url)
*/

```

--------------------------------

### Swift Authentication ViewModel with Combine and SwiftUI

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Manages authentication states, handles sign-in/sign-out operations, and provides user feedback. It uses Combine for session observation and includes a timeout mechanism for network requests. Dependencies include Combine and Foundation. Inputs are `AuthProvider` and `AuthService`, outputs are `State` and `Feedback`.

```swift
import Combine
import Foundation

@MainActor
final class AuthViewModel: ObservableObject {
    enum State: Equatable {
        case signedOut
        case loading(AuthProvider)
        case authenticated(UserSession)
        case failure(AuthProvider, AuthError)

        var isAuthenticated: Bool {
            if case .authenticated = self { return true }
            return false
        }
    }

    struct Feedback: Identifiable, Equatable {
        enum Kind { case success, failure }
        let id = UUID()
        let kind: Kind
        let title: String?
        let message: String
        let timestamp: Date
    }

    @Published private(set) var state: State
    @Published private(set) var isProcessing: Bool = false
    @Published private(set) var feedback: Feedback?

    private let service: AuthService
    private let timeoutInterval: TimeInterval
    private var cancellables = Set<AnyCancellable>()

    init(service: AuthService, timeoutInterval: TimeInterval = 8) {
        self.service = service
        self.timeoutInterval = timeoutInterval
        self.state = service.currentSession.map { .authenticated($0) } ?? .signedOut

        // Observe session changes
        service.sessionPublisher
            .receive(on: RunLoop.main)
            .sink { [weak self] session in
                guard let self = self else { return }
                if let session = session {
                    self.state = .authenticated(session)
                } else if case .failure = self.state {
                    // Keep failure state visible
                } else {
                    self.state = .signedOut
                }
            }
            .store(in: &cancellables)
    }

    func signIn(with provider: AuthProvider) async {
        guard !isProcessing else { return }

        state = .loading(provider)
        isProcessing = true
        feedback = nil

        // Start timeout timer
        let timeoutTask = Task {
            try? await Task.sleep(nanoseconds: UInt64(timeoutInterval * 1_000_000_000))
            await MainActor.run {
                if self.isProcessing {
                    self.handleTimeout(provider: provider)
                }
            }
        }

        do {
            let session = try await service.signIn(with: provider)
            timeoutTask.cancel()
            isProcessing = false
            state = .authenticated(session)
            feedback = Feedback(
                kind: .success,
                title: "Login Successful",
                message: "Welcome, \(session.displayName)!",
                timestamp: Date()
            )
        } catch let error as AuthError {
            timeoutTask.cancel()
            isProcessing = false
            state = .failure(provider, error)
            feedback = Feedback(
                kind: .failure,
                title: "Login Failed",
                message: error.errorDescription ?? "Unknown error",
                timestamp: Date()
            )
        }
    }

    func signOut() async {
        guard !isProcessing else { return }
        isProcessing = true
        await service.signOut()
        isProcessing = false
        state = .signedOut
    }

    private func handleTimeout(provider: AuthProvider) {
        isProcessing = false
        state = .failure(provider, .timedOut)
        feedback = Feedback(
            kind: .failure,
            title: "Connection Timeout",
            message: "The request took too long",
            timestamp: Date()
        )
    }
}

// Usage in SwiftUI
struct AuthView: View {
    @StateObject private var viewModel: AuthViewModel

    init(authService: AuthService) {
        _viewModel = StateObject(wrappedValue: AuthViewModel(service: authService))
    }

    var body: some View {
        VStack {
            if case .loading(let provider) = viewModel.state {
                ProgressView("Signing in with \(provider.displayName)..." )
            } else {
                Button("Sign in with Apple") {
                    Task { await viewModel.signIn(with: .apple) }
                }
                Button("Sign in with Google") {
                    Task { await viewModel.signIn(with: .google) }
                }
            }
        }
        .alert(item: $viewModel.feedback) { feedback in
            Alert(
                title: Text(feedback.title ?? ""),
                message: Text(feedback.message),
                dismissButton: .default(Text("OK"))
            )
        }
    }
}

```

--------------------------------

### Swift Authentication Service Protocol and Models

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Defines the core authentication service protocol (`AuthService`) with methods for signing in and out, and observing session changes. It also includes models for authentication providers (`AuthProvider`), user sessions (`UserSession`), and potential authentication errors (`AuthError`). This provides a clear contract for any authentication implementation and defines the data structures involved.

```swift
import Combine
import Foundation

// Define authentication service protocol
protocol AuthService: AnyObject {
    var currentSession: UserSession? { get }
    var sessionPublisher: AnyPublisher<UserSession?, Never> { get }

    @discardableResult
    func signIn(with provider: AuthProvider) async throws -> UserSession
    func signOut() async
}

// Authentication models
enum AuthProvider: String, Codable {
    case apple
    case google

    var displayName: String {
        switch self {
        case .apple: return "Apple"
        case .google: return "Google"
        }
    }
}

struct UserSession: Codable, Equatable, Sendable {
    let id: UUID
    let displayName: String
    let provider: AuthProvider
    let createdAt: Date
}

enum AuthError: Error, LocalizedError {
    case cancelled
    case failed(reason: String? = nil)
    case timedOut

    var errorDescription: String? {
        switch self {
        case .cancelled: return "User cancelled login"
        case .failed(let reason): return "Login failed: \(reason ?? \"Unknown error\")"
        case .timedOut: return "Login request timed out"
        }
    }
}
```

--------------------------------

### SwiftUI Interface Provider for Theme and Accessibility State

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Manages global theme (color scheme) and accessibility states (reduce motion, dynamic type) in a SwiftUI application. It utilizes Combine for observing accessibility changes and can be observed by views using @EnvironmentObject. Dependencies include SwiftUI and Combine.

```swift
import SwiftUI
import Combine

@MainActor
final class InterfaceProvider: ObservableObject {
    @Published var colorScheme: ColorScheme = .light
    @Published var reduceMotion: Bool = UIAccessibility.isReduceMotionEnabled
    @Published var dynamicType: DynamicTypeSize = .medium

    private var cancellables = Set<AnyCancellable>()

    init() {
        observeAccessibilityChanges()
    }

    func set(colorScheme: ColorScheme) {
        self.colorScheme = colorScheme
    }

    func set(reduceMotion: Bool) {
        self.reduceMotion = reduceMotion
    }

    func set(dynamicType: DynamicTypeSize) {
        self.dynamicType = dynamicType
    }

    private func observeAccessibilityChanges() {
        NotificationCenter.default
            .publisher(for: UIAccessibility.reduceMotionStatusDidChangeNotification)
            .map { _ in UIAccessibility.isReduceMotionEnabled }
            .sink { [weak self] isEnabled in
                self?.reduceMotion = isEnabled
            }
            .store(in: &cancellables)
    }
}

// Usage in app initialization
@main
struct MyApp: App {
    @StateObject private var interfaceProvider = InterfaceProvider()

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(interfaceProvider)
                .preferredColorScheme(interfaceProvider.colorScheme)
        }
    }
}

// Usage in views
struct SettingsView: View {
    @EnvironmentObject var interfaceProvider: InterfaceProvider

    var body: some View {
        VStack {
            Picker("Theme", selection: $interfaceProvider.colorScheme) {
                Text("Light").tag(ColorScheme.light)
                Text("Dark").tag(ColorScheme.dark)
            }

            Toggle("Reduce Motion", isOn: $interfaceProvider.reduceMotion)

            Text("Current type size: \(interfaceProvider.dynamicType.description)")
        }
    }
}

// Access in view modifiers
extension View {
    func adaptiveAnimation(_ animation: Animation) -> some View {
        modifier(AdaptiveAnimationModifier(animation: animation))
    }
}

private struct AdaptiveAnimationModifier: ViewModifier {
    @EnvironmentObject var interfaceProvider: InterfaceProvider
    let animation: Animation

    func body(content: Content) -> some View {
        content.animation(
            interfaceProvider.reduceMotion ? nil : animation,
            value: UUID()
        )
    }
}

```

--------------------------------

### Adaptive Layout Context Resolution and Breakpoint Handling (Swift)

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Defines an AdaptiveLayoutContext to represent the current layout state based on screen width, idiom, and orientation. It includes a static method `resolve` to determine the breakpoint and device characteristics from a GeometryProxy. This context is crucial for making adaptive UI decisions.

```swift
import SwiftUI

struct AdaptiveLayoutContext: Equatable {
    enum Breakpoint: Equatable {
        case compact   // < 600pt width
        case medium    // 600pt - 900pt width
        case expanded  // > 900pt width
    }

    let breakpoint: Breakpoint
    let idiom: UIUserInterfaceIdiom
    let isLandscape: Bool
    let width: CGFloat
    let height: CGFloat

    var isPad: Bool { idiom == .pad }
    var isPhone: Bool { idiom == .phone }

    static func resolve(
        proxy: GeometryProxy,
        horizontalSizeClass: UserInterfaceSizeClass?,
        verticalSizeClass: UserInterfaceSizeClass?
    ) -> AdaptiveLayoutContext {
        let size = proxy.size
        let width = size.width
        let height = size.height
        let isLandscape = width > height
        let idiom = UIDevice.current.userInterfaceIdiom

        let breakpoint: Breakpoint
        switch width {
        case ..<600: breakpoint = .compact
        case 600..<900: breakpoint = .medium
        default: breakpoint = .expanded
        }

        return AdaptiveLayoutContext(
            breakpoint: breakpoint,
            idiom: idiom,
            isLandscape: isLandscape,
            width: width,
            height: height
        )
    }

    var columnVisibilityPreference: NavigationSplitViewVisibility {
        switch breakpoint {
        case .compact: return .detailOnly
        case .medium: return .doubleColumn
        case .expanded: return .all
        }
    }
}

```

--------------------------------

### Implement Haptic Feedback System in Swift

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Provides an accessibility-aware haptic feedback system using UIKit. It supports various feedback types like impact, notification, and selection, and allows for custom intensity. The system respects accessibility settings like reduced motion.

```swift
import UIKit

public enum RPHapticFeedback {
    case impact(UIImpactFeedbackGenerator.FeedbackStyle)
    case notification(UINotificationFeedbackGenerator.FeedbackType)
    case selection
    case custom(intensity: CGFloat)

    var requiresStrongFeedback: Bool {
        switch self {
        case .notification, .custom: return true
        default: return false
        }
    }
}

public protocol RPHapticTriggering {
    func trigger(_ feedback: RPHapticFeedback)
    func prepare()
}

public final class RPHapticEngine: RPHapticTriggering {
    public static let shared = RPHapticEngine()

    public var isEnabled: Bool = true
    public var allowStrongFeedback: Bool = !UIAccessibility.isReduceMotionEnabled

    private let impactGenerator = UIImpactFeedbackGenerator(style: .medium)
    private let notificationGenerator = UINotificationFeedbackGenerator()
    private let selectionGenerator = UISelectionFeedbackGenerator()

    public func prepare() {
        guard isEnabled else { return }
        impactGenerator.prepare()
        notificationGenerator.prepare()
        selectionGenerator.prepare()
    }

    public func trigger(_ feedback: RPHapticFeedback) {
        guard isEnabled else { return }

        switch feedback {
        case .impact(let style):
            let resolvedStyle = allowStrongFeedback ? style : .medium
            UIImpactFeedbackGenerator(style: resolvedStyle).impactOccurred()

        case .notification(let type):
            guard allowStrongFeedback || !feedback.requiresStrongFeedback else { return }
            notificationGenerator.notificationOccurred(type)

        case .selection:
            selectionGenerator.selectionChanged()

        case .custom(let intensity):
            guard allowStrongFeedback || intensity < 1 else { return }
            UIImpactFeedbackGenerator(style: .medium)
                .impactOccurred(intensity: max(0, min(1, intensity)))
        }
    }
}

// Usage examples
let haptics = RPHapticEngine.shared

// Prepare for immediate feedback
haptics.prepare()

// Button tap
haptics.trigger(.impact(.light))

// Selection change in picker
haptics.trigger(.selection)

// Success notification
haptics.trigger(.notification(.success))

// Error notification
haptics.trigger(.notification(.error))

// Warning notification
haptics.trigger(.notification(.warning))

// Custom intensity (0.0 - 1.0)
haptics.trigger(.custom(intensity: 0.5))

// Heavy impact for important actions
haptics.trigger(.impact(.heavy))

// Disable haptics
haptics.isEnabled = false
haptics.trigger(.selection)  // No effect

```

--------------------------------

### Implement Session Persistence using UserDefaults and JSON in Swift

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

A session persistence mechanism that leverages UserDefaults for storage and JSON encoding/decoding for data serialization. It supports loading, saving, and clearing user session data, with customizable storage keys and date formatting.

```swift
import Foundation

protocol SessionPersistence {
    func loadSession() -> UserSession?
    func save(session: UserSession?)
    func clear()
}

final class UserDefaultsSessionPersistence: SessionPersistence {
    private enum Constants {
        static let storageKey = "auth.mock.session"
    }

    private let userDefaults: UserDefaults
    private let key: String
    private let encoder: JSONEncoder
    private let decoder: JSONDecoder

    init(userDefaults: UserDefaults = .standard,
         key: String = Constants.storageKey) {
        self.userDefaults = userDefaults
        self.key = key
        self.encoder = JSONEncoder()
        self.encoder.dateEncodingStrategy = .iso8601
        self.decoder = JSONDecoder()
        self.decoder.dateDecodingStrategy = .iso8601
    }

    func loadSession() -> UserSession? {
        guard let data = userDefaults.data(forKey: key) else { return nil }
        return try? decoder.decode(UserSession.self, from: data)
    }

    func save(session: UserSession?) {
        guard let session else {
            userDefaults.removeObject(forKey: key)
            return
        }
        guard let data = try? encoder.encode(session) else { return }
        userDefaults.set(data, forKey: key)
    }

    func clear() {
        userDefaults.removeObject(forKey: key)
    }
}

// Usage examples
let persistence = UserDefaultsSessionPersistence()

// Save session
let session = UserSession(
    id: UUID(),
    displayName: "John Doe",
    provider: .apple,
    createdAt: Date()
)
persistence.save(session: session)

// Load session
if let loadedSession = persistence.loadSession() {
    print("Restored session for \(loadedSession.displayName)")
} else {
    print("No saved session")
}

// Clear session
persistence.clear()

// Custom storage key
let customPersistence = UserDefaultsSessionPersistence(
    userDefaults: .standard,
    key: "custom.auth.key"
)

```

--------------------------------

### Adaptive Padding and Max Width Modifier (SwiftUI)

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Implements a ViewModifier, `AdaptiveContentContainerModifier`, that applies adaptive padding and maximum width based on the current breakpoint. This modifier helps to ensure consistent spacing and content centering across different screen sizes. It also includes a convenience extension function `adaptiveContentContainer()` for easier application.

```swift
// Adaptive padding modifier
extension View {
    func adaptiveContentContainer() -> some View {
        modifier(AdaptiveContentContainerModifier())
    }
}

private struct AdaptiveContentContainerModifier: ViewModifier {
    @Environment(\.adaptiveLayoutContext) private var layout

    func body(content: Content) -> some View {
        let (horizontalPadding, verticalPadding, maxWidth): (CGFloat, CGFloat, CGFloat?) = {
            switch layout.breakpoint {
            case .compact: return (16, 20, nil)
            case .medium: return (24, 24, 720)
            case .expanded: return (32, 32, 960)
            }
        }()

        return content
            .padding(.horizontal, horizontalPadding)
            .padding(.vertical, verticalPadding)
            .frame(maxWidth: maxWidth, alignment: .center)
            .frame(maxWidth: .infinity, alignment: .center)
    }
}

```

--------------------------------

### RPButton Component Definition in Swift

Source: https://context7.com/gmini9999/rollingpaper/llms.txt

Defines the RPButton struct in Swift, including its enum types for variants and sizes. This component allows for customizable button appearances and actions within a SwiftUI application.

```swift
import SwiftUI

public enum RPButtonVariant {
    case primary      // Filled with primary color
    case secondary    // Outlined with border
    case tertiary     // Text only with subtle border
    case destructive  // Filled with danger color
    case link         // Underlined text style
}

public enum RPButtonSize {
    case large   // 52pt height, 22pt font
    case medium  // 44pt height, 15pt font
    case small   // 36pt height, 15pt font
}

public struct RPButton: View {
    private let title: String
    private let variant: RPButtonVariant
    private let size: RPButtonSize
    private let leadingIcon: Image?
    private let trailingIcon: Image?
    private let isEnabled: Bool
    private let fillsWidth: Bool
    private let action: () -> Void

    public init(_ title: String,
                variant: RPButtonVariant = .primary,
                size: RPButtonSize = .large,
                leadingIcon: Image? = nil,
                trailingIcon: Image? = nil,
                isEnabled: Bool = true,
                fillsWidth: Bool = true,
                action: @escaping () -> Void) {
        self.title = title
        self.variant = variant
        self.size = size
        self.leadingIcon = leadingIcon
        self.trailingIcon = trailingIcon
        self.isEnabled = isEnabled
        self.fillsWidth = fillsWidth
        self.action = action
    }

    public var body: some View {
        Button(action: action) {
            HStack(spacing: size.iconSpacing) {
                if let leadingIcon { leadingIcon }
                Text(title).font(size.font).lineLimit(1)
                if let trailingIcon { trailingIcon }
            }
            .padding(.horizontal, size.horizontalPadding)
            .padding(.vertical, size.verticalPadding)
            .frame(maxWidth: fillsWidth ? .infinity : nil)
        }
        .buttonStyle(RPButtonStyle(variant: variant, size: size, isEnabled: isEnabled))
        .disabled(!isEnabled)
    }
}

```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.