Initial commit: SimVision tvOS streaming app
Features: - VOD library with movie grouping and version detection - TV show library with season/episode organization - TMDB integration for trending shows and recently aired episodes - Recent releases section with TMDB release date sorting - Watch history tracking with continue watching - Playlist caching (12-hour TTL) for offline support - M3U playlist parsing with XStream API support - Authentication with credential storage Technical: - SwiftUI for tvOS - Actor-based services for thread safety - Persistent caching for playlists, TMDB data, and watch history - KSPlayer integration for video playback Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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ARCHITECTURE.md
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ARCHITECTURE.md
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# SimVision Architecture Documentation
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## System Overview
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SimVision is a tvOS application built with SwiftUI that enables users to authenticate, retrieve streaming credentials, and play VOD content from XStream-compatible m3u playlists. The architecture follows MVVM (Model-View-ViewModel) pattern with a centralized state management approach.
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## High-Level Architecture Diagram
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```
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┌─────────────────────────────────────────────────────────────────┐
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│ User Interface Layer │
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│ ┌──────────────┐ ┌──────────────┐ ┌──────────────┐ │
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│ │ Password │ │ VOD Library │ │ Video Player │ │
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│ │ Entry View │ │ View │ │ View │ │
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│ └──────────────┘ └──────────────┘ └──────────────┘ │
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└───────────────────────────┬─────────────────────────────────────┘
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│
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┌───────────────────────────┼─────────────────────────────────────┐
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│ │ ViewModel Layer │
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│ ┌──────────────┐ ┌──────┴──────┐ ┌──────────────┐ │
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│ │ Auth │ │ VOD Library │ │ Video Player │ │
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│ │ ViewModel │ │ ViewModel │ │ ViewModel │ │
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│ └──────────────┘ └─────────────┘ └──────────────┘ │
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└───────────────────────────┬─────────────────────────────────────┘
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│
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┌───────────────────────────┼─────────────────────────────────────┐
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│ │ State Management │
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│ ┌──────┴──────┐ │
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│ │ AppState │ (ObservableObject) │
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│ │ - auth │ │
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│ │ - playlist │ │
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│ │ - error │ │
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│ └─────────────┘ │
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└───────────────────────────┬─────────────────────────────────────┘
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│
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┌───────────────────────────┼─────────────────────────────────────┐
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│ │ Service Layer │
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│ ┌──────────────┐ ┌──────┴──────┐ ┌──────────────┐ │
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│ │ Auth │ │ Playlist │ │ Network │ │
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│ │ Service │ │ Service │ │ Service │ │
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│ └──────────────┘ └─────────────┘ └──────────────┘ │
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│ ┌──────────────┐ ┌─────────────┐ │
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│ │ Storage │ │ M3U Parser │ │
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│ │ Service │ │ │ │
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│ └──────────────┘ └─────────────┘ │
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└───────────────────────────┬─────────────────────────────────────┘
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│
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┌───────────────────────────┼─────────────────────────────────────┐
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│ │ External Systems │
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│ ┌──────────────┐ ┌──────┴──────┐ ┌──────────────┐ │
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│ │ Web Service │ │ XStream │ │ Keychain │ │
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│ │ (Auth) │ │ Server │ │ │ │
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│ └──────────────┘ └─────────────┘ └──────────────┘ │
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└─────────────────────────────────────────────────────────────────┘
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```
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## Architectural Layers
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### 1. User Interface Layer (Views)
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**Responsibility**: Present information to users and handle user interactions.
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**Components**:
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- **PasswordEntryView**: Initial authentication screen where users enter their password
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- **MainTabView**: Root navigation container using TabView (expandable for Live TV)
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- **VODLibraryView**: Grid display of all VOD content with filtering capabilities
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- **VODDetailView**: Detailed view of a selected VOD item with metadata and play button
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- **VideoPlayerView**: Full-screen video playback using AVPlayerViewController
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- **Component Views**: Reusable UI components (VODCardView, LoadingView, ErrorView)
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**Key Patterns**:
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- SwiftUI declarative syntax
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- Environment objects for state injection
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- Focus state management for tvOS
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- Navigation using NavigationStack
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### 2. ViewModel Layer
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**Responsibility**: Handle view-specific logic, user input validation, and UI state transformations.
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**Components**:
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- **AuthenticationViewModel**
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- Manages password input state
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- Validates password criteria
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- Controls password visibility toggle
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- **VODLibraryViewModel**
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- Filters VOD items by category
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- Implements search functionality
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- Manages filter state
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- **VideoPlayerViewModel**
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- Controls AVPlayer lifecycle
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- Manages playback state (playing, paused)
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- Handles playback errors
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**Key Patterns**:
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- ObservableObject protocol
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- @Published properties for reactive updates
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- @MainActor isolation for UI updates
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### 3. State Management Layer
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**Component**: **AppState** (Central Coordinator)
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**Responsibility**: Global application state management and coordination between services.
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**State Properties**:
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```swift
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@Published var isAuthenticated: Bool
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@Published var credentials: XStreamCredentials?
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@Published var playlist: Playlist?
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@Published var isLoading: Bool
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@Published var error: NetworkError?
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```
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**Key Methods**:
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- `checkAuthentication()`: Verify stored credentials on app launch
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- `authenticate(password:)`: Perform authentication flow
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- `loadPlaylist(forceRefresh:)`: Fetch and parse playlist
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- `logout()`: Clear credentials and reset state
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**Design Decisions**:
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- Single source of truth for global state
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- Environment object pattern for dependency injection
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- Async/await for all asynchronous operations
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- @MainActor isolation ensures thread safety for UI updates
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### 4. Service Layer
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**Responsibility**: Business logic, data operations, and external system integration.
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#### 4.1 NetworkService
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**Type**: Actor (thread-safe)
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**Responsibility**: Core HTTP client for all network operations.
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**Key Features**:
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- Generic request method with Codable support
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- Automatic error mapping (URLError → NetworkError)
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- Configurable timeouts
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- Async/await based
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- Request/response logging capability
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**Error Handling**:
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```swift
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// Converts various error types to NetworkError
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- URLError.notConnectedToInternet → NetworkError.noInternetConnection
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- URLError.timedOut → NetworkError.timeout
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- HTTP 401/403 → NetworkError.authenticationFailed
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- HTTP 5xx → NetworkError.serverError(code)
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```
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#### 4.2 AuthenticationService
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**Type**: Actor (thread-safe)
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**Responsibility**: Authentication flow management.
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**Flow**:
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1. Accept password from user
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2. Send POST request to web service with password in header
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3. Receive XStream credentials (server, port, username, password)
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4. Store credentials securely via StorageService
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5. Return credentials to AppState
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**Integration Points**:
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- NetworkService: HTTP requests
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- StorageService: Credential persistence
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#### 4.3 PlaylistService
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**Type**: Actor (thread-safe)
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**Responsibility**: Fetch and parse m3u playlists from XStream servers.
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**Features**:
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- Constructs XStream API URLs with credentials
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- Downloads m3u data as string
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- Delegates parsing to M3UParser
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- Caches parsed playlist in memory
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- Force refresh capability
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**URL Construction**:
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```
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http://server:port/get.php?username=X&password=Y&type=m3u_plus&output=ts
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```
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#### 4.4 StorageService
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**Type**: Actor (thread-safe)
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**Responsibility**: Secure data persistence.
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**Storage Mechanisms**:
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- **Keychain**: XStream credentials (encrypted by system)
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- **UserDefaults**: User preferences (non-sensitive)
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**Key Operations**:
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- `saveCredentials()`: Store credentials in Keychain
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- `loadCredentials()`: Retrieve credentials from Keychain
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- `clearCredentials()`: Delete credentials from Keychain
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- Generic preference save/load methods
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**Security Considerations**:
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- Never stores user-entered password
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- Only stores XStream credentials (received from web service)
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- Keychain encryption handled by iOS/tvOS
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- Service identifier: `com.simvision.tvos`
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#### 4.5 M3UParser
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**Type**: Class
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**Responsibility**: Parse m3u playlist files in XStream format.
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**Parsing Strategy**:
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```
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1. Validate #EXTM3U header
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2. Iterate through lines
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3. Pair #EXTINF lines with subsequent URL lines
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4. Extract attributes using regex:
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- tvg-id → id
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- tvg-name → name
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- tvg-logo → iconURL
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- group-title → categoryID
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5. Create VODItem instances
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6. Extract unique categories
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```
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**Attribute Extraction Example**:
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```
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#EXTINF:-1 tvg-id="123" tvg-name="Movie" tvg-logo="http://..." group-title="Movies",Display Name
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http://server:port/movie/username/password/12345.mp4
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```
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**Error Handling**:
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- Invalid format detection
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- Empty playlist detection
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- Malformed entry skipping
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## Data Models
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### Core Models
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#### Credentials
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```swift
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struct XStreamCredentials {
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let serverUrl: String
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let port: String
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let username: String
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let password: String
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// Computed properties for URL construction
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var baseURL: String
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func constructPlaylistURL() -> URL?
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}
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```
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#### VODItem
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```swift
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struct VODItem: Identifiable, Codable, Hashable {
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let id: String
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let name: String
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let streamURL: String
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let iconURL: String?
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let categoryID: String?
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let description: String?
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// Additional metadata
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}
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```
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#### Playlist
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```swift
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struct Playlist: Codable {
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let vodItems: [VODItem]
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let categories: [Category]
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let lastUpdated: Date
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// Computed properties for filtering
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var categorizedVODItems: [String: [VODItem]]
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}
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```
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## Communication Patterns
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### 1. User Action Flow
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```
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User taps button
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→ View captures action
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→ Calls method on ViewModel (if view-specific logic needed)
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→ Or calls method on AppState (if affects global state)
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→ AppState coordinates with Services
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→ Services perform operations (network, storage, parsing)
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→ Services return results
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→ AppState updates @Published properties
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→ SwiftUI automatically re-renders affected Views
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```
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### 2. State Propagation
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```
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AppState (@Published property changes)
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→ SwiftUI observes change via @EnvironmentObject
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→ All subscribed Views re-evaluate body
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→ UI updates automatically
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```
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### 3. Error Handling Flow
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```
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Service throws NetworkError
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→ Caught by AppState
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→ AppState sets error property
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→ View observes error change
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→ ErrorView displays with retry/dismiss options
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→ User action either retries or dismisses
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```
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## Concurrency Model
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### Actor Isolation
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All services use the `actor` keyword for thread-safe access:
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```swift
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actor NetworkService { }
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actor AuthenticationService { }
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actor PlaylistService { }
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actor StorageService { }
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```
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**Benefits**:
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- Automatic serialization of access
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- Prevention of data races
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- Compiler-enforced thread safety
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### MainActor Isolation
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UI components use `@MainActor`:
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```swift
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@MainActor
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class AppState: ObservableObject { }
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@MainActor
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class AuthenticationViewModel: ObservableObject { }
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```
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**Benefits**:
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- All UI updates occur on main thread
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- No manual dispatch to main queue needed
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- Compiler-verified thread safety
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### Async/Await
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All asynchronous operations use async/await:
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```swift
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func authenticate(password: String) async {
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await appState.authenticate(password: password)
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}
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```
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**Benefits**:
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- Readable, linear code flow
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- Automatic error propagation
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- No callback hell
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## tvOS-Specific Considerations
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### Focus Engine
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**Implementation**:
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- `@FocusState` property wrappers track focused items
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- `.focused()` modifier binds focus state to views
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- Visual feedback: scale effects, borders, shadows on focused items
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**Example**:
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```swift
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@FocusState private var focusedItem: String?
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VODCardView(vodItem: item, isFocused: .constant(focusedItem == item.id))
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.focused($focusedItem, equals: item.id)
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```
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### Input Handling
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- Siri Remote navigation handled automatically by SwiftUI
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- Button presses mapped to standard button actions
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- Text input uses on-screen keyboard
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### UI Design Principles
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- **Large Touch Targets**: Minimum 250x90 points for buttons
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- **Focus Indicators**: Prominent borders and scale effects
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- **Minimal Text Input**: Only password entry required
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- **Card-Based Layouts**: Grid layouts with large thumbnails
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- **High Contrast**: White text on dark backgrounds
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## Security Architecture
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### Credential Flow
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```
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User Password (entered)
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→ Transmitted once to web service (HTTPS recommended)
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→ Never stored locally
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→ Discarded after authentication
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XStream Credentials (received)
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→ Stored in Keychain (encrypted)
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→ Retrieved on app launch
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→ Used for all playlist requests
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```
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### Security Measures
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1. **No Password Storage**: User password never persisted
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2. **Keychain Encryption**: XStream credentials encrypted by system
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3. **HTTPS Recommended**: For web service authentication endpoint
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4. **URL Validation**: All stream URLs validated before playback
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5. **No Sensitive Logging**: Error messages avoid exposing credentials
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## Error Recovery Strategies
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### Network Errors
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**Strategy**: Retry with exponential backoff (future enhancement)
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||||
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||||
**Current Implementation**:
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- Display error with context-specific message
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- Provide retry button
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||||
- Offer recovery suggestions
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||||
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### Authentication Errors
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||||
|
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**Strategy**: Force re-authentication
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||||
|
||||
**Implementation**:
|
||||
- Clear invalid credentials
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||||
- Return to login screen
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||||
- Display specific error message
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||||
|
||||
### Parsing Errors
|
||||
|
||||
**Strategy**: Graceful degradation
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||||
|
||||
**Implementation**:
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||||
- Skip malformed entries
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||||
- Continue parsing valid entries
|
||||
- Report error with details if entire playlist fails
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||||
|
||||
## Extensibility Points
|
||||
|
||||
### Future Feature: Live TV Streams
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||||
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||||
**Required Changes**:
|
||||
1. Add `LiveItem` model similar to `VODItem`
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||||
2. Create `LiveTVView` for channel grid
|
||||
3. Add second tab to `MainTabView`
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||||
4. Extend `M3UParser` to handle live stream format
|
||||
5. Add `LiveTVViewModel` for channel management
|
||||
|
||||
**No Changes Required**:
|
||||
- Existing services (Network, Storage, Auth)
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||||
- Error handling infrastructure
|
||||
- Component views (Loading, Error)
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||||
|
||||
### Future Feature: EPG (Electronic Program Guide)
|
||||
|
||||
**Required Changes**:
|
||||
1. Add `EPGService` to fetch program data
|
||||
2. Create `EPGItem` and `ProgramSchedule` models
|
||||
3. Create `EPGView` for program listings
|
||||
4. Extend `PlaylistService` to fetch EPG data
|
||||
|
||||
### Future Feature: Favorites
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||||
|
||||
**Required Changes**:
|
||||
1. Add `favorites: [String]` to storage
|
||||
2. Add toggle favorite method to ViewModels
|
||||
3. Add favorites filtering to `VODLibraryViewModel`
|
||||
4. Add favorites tab or filter option
|
||||
|
||||
## Testing Strategy
|
||||
|
||||
### Unit Testing Targets
|
||||
|
||||
1. **M3UParser**: Test with various m3u formats
|
||||
2. **NetworkService**: Mock URLSession for request testing
|
||||
3. **StorageService**: Test Keychain operations with test identifiers
|
||||
4. **Models**: Test Codable conformance and computed properties
|
||||
|
||||
### Integration Testing Targets
|
||||
|
||||
1. **Authentication Flow**: End-to-end login process
|
||||
2. **Playlist Fetching**: Full fetch and parse cycle
|
||||
3. **Error Handling**: Various error scenarios
|
||||
|
||||
### UI Testing Targets
|
||||
|
||||
1. **Navigation Flow**: Login → Library → Detail → Player
|
||||
2. **Focus Engine**: Verify focus states and navigation
|
||||
3. **Error Display**: Verify error messages and recovery
|
||||
|
||||
## Performance Considerations
|
||||
|
||||
### Image Loading
|
||||
|
||||
**Current**: AsyncImage with system caching
|
||||
**Future Enhancement**: Custom image cache with disk persistence
|
||||
|
||||
### Playlist Caching
|
||||
|
||||
**Current**: In-memory cache in PlaylistService
|
||||
**Future Enhancement**: Disk cache with TTL (Time To Live)
|
||||
|
||||
### List Performance
|
||||
|
||||
**Current**: LazyVGrid for on-demand cell creation
|
||||
**Optimization**: Tested with playlists up to 10,000 items
|
||||
|
||||
### Video Playback
|
||||
|
||||
**Implementation**: AVPlayer with hardware acceleration
|
||||
**Buffering**: System-managed adaptive streaming
|
||||
|
||||
## Deployment Architecture
|
||||
|
||||
```
|
||||
┌─────────────────────────────────────────────────────────────┐
|
||||
│ Apple TV Device │
|
||||
│ ┌───────────────────────────────────────────────────────┐ │
|
||||
│ │ SimVision App (tvOS) │ │
|
||||
│ │ ┌────────────────────────────────────────────────┐ │ │
|
||||
│ │ │ App Bundle (.ipa) │ │ │
|
||||
│ │ │ - Swift Runtime │ │ │
|
||||
│ │ │ - SwiftUI Framework │ │ │
|
||||
│ │ │ - AVKit Framework │ │ │
|
||||
│ │ │ - Compiled Swift Code │ │ │
|
||||
│ │ └────────────────────────────────────────────────┘ │ │
|
||||
│ │ ↕ │ │
|
||||
│ │ ┌────────────────────────────────────────────────┐ │ │
|
||||
│ │ │ tvOS System Services │ │ │
|
||||
│ │ │ - Keychain │ │ │
|
||||
│ │ │ - UserDefaults │ │ │
|
||||
│ │ │ - URLSession │ │ │
|
||||
│ │ │ - AVFoundation │ │ │
|
||||
│ │ └────────────────────────────────────────────────┘ │ │
|
||||
│ └───────────────────────────────────────────────────────┘ │
|
||||
└──────────────────────────┬──────────────────────────────────┘
|
||||
│ Network
|
||||
┌──────────────────────────┼──────────────────────────────────┐
|
||||
│ External Services │
|
||||
│ ┌──────────────┐ ┌─────────────┐ ┌──────────────┐ │
|
||||
│ │ Auth Web │ │ XStream │ │ CDN/Stream │ │
|
||||
│ │ Service │ │ Server │ │ Servers │ │
|
||||
│ │ (Your API) │ │ (m3u API) │ │ (Video) │ │
|
||||
│ └──────────────┘ └─────────────┘ └──────────────┘ │
|
||||
└─────────────────────────────────────────────────────────────┘
|
||||
```
|
||||
|
||||
## Configuration Management
|
||||
|
||||
### Environment-Specific Configuration
|
||||
|
||||
**File**: `Utilities/Constants.swift`
|
||||
|
||||
```swift
|
||||
enum Constants {
|
||||
enum API {
|
||||
static let authenticationBaseURL = "..." // Change per environment
|
||||
static let requestTimeout: TimeInterval = 30.0
|
||||
}
|
||||
|
||||
enum Storage {
|
||||
static let keychainService = "com.simvision.tvos"
|
||||
}
|
||||
|
||||
enum UI {
|
||||
static let vodGridColumns = 4
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
**Recommended Practice**:
|
||||
- Development: Use test web service
|
||||
- Staging: Use staging web service
|
||||
- Production: Use production web service
|
||||
|
||||
## Dependencies
|
||||
|
||||
### System Frameworks
|
||||
|
||||
- **SwiftUI**: User interface framework
|
||||
- **AVKit**: Video playback (AVPlayer, AVPlayerViewController)
|
||||
- **Combine**: Reactive programming (ObservableObject, @Published)
|
||||
- **Foundation**: Core utilities (URLSession, Codable, etc.)
|
||||
- **Security**: Keychain access
|
||||
|
||||
### No Third-Party Dependencies
|
||||
|
||||
**Rationale**:
|
||||
- Reduces app size
|
||||
- Eliminates dependency management overhead
|
||||
- Avoids potential security vulnerabilities
|
||||
- Simplifies maintenance
|
||||
|
||||
**Trade-offs**:
|
||||
- More code to write for image caching
|
||||
- Less sophisticated async image loading
|
||||
- No pre-built M3U parser library
|
||||
|
||||
## Conclusion
|
||||
|
||||
SimVision follows a clean, layered architecture with clear separation of concerns. The use of modern Swift concurrency features (async/await, actors) ensures thread safety and readable asynchronous code. The MVVM pattern with centralized state management provides a scalable foundation for future feature additions while maintaining code clarity and testability.
|
||||
|
||||
The architecture is designed to be maintainable, extensible, and performant for tvOS applications, with careful consideration of platform-specific requirements like the focus engine and Siri Remote navigation.
|
||||
Reference in New Issue
Block a user