// Example Package.swift structure
// swift-tools-version:5.9
import PackageDescription

let package = Package(
    name: "MKS-IPTV-App",
    platforms: [
        .iOS(.v17),
        .macOS(.v14),
        .tvOS(.v17)
    ],
    dependencies: [
        // Add external dependencies here
        .package(url: "https://github.com/apple/swift-log.git", from: "1.0.0")
    ],
    targets: [
        .target(
            name: "IPTVCore",
            dependencies: [
                .product(name: "Logging", package: "swift-log")
            ]
        )
    ]
)

// Model
struct IPTVStream: Codable, Identifiable {
    let id: UUID
    let name: String
    let url: URL
}

// View
struct StreamListView: View {
    @StateObject private var viewModel = StreamListViewModel()
    
    var body: some View {
        List(viewModel.streams) { stream in
            StreamRowView(stream: stream)
        }
    }
}

// ViewModel
@MainActor
class StreamListViewModel: ObservableObject {
    @Published var streams: [IPTVStream] = []
    
    func loadStreams() async {
        // Business logic here
    }
}

actor StreamManager {
    private var activeStreams: [UUID: AVPlayer] = [:]
    
    func createStream(url: URL) async throws -> UUID {
        let streamId = UUID()
        let player = AVPlayer(url: url)
        activeStreams[streamId] = player
        return streamId
    }
}

// Types: PascalCase
class StreamManager { }
struct IPTVConfiguration { }
enum PlaybackState { }

// Variables and functions: camelCase
var currentStream: IPTVStream?
func loadStream(_ url: URL) async throws

// Constants: camelCase
let maxRetryAttempts = 3
let defaultTimeout: TimeInterval = 30

// Private properties: leading underscore (optional)
private var _internalCache: [String: Any] = [:]

/// Loads and prepares an IPTV stream for playback
/// - Parameters:
///   - url: The stream URL to load
///   - metadata: Optional stream metadata
/// - Returns: Unique identifier for the stream session
/// - Throws: `StreamError` if the stream cannot be loaded
func loadStream(
    _ url: URL, 
    metadata: StreamMetadata? = nil
) async throws -> UUID {
    // Implementation
}

enum StreamError: LocalizedError {
    case invalidURL(URL)
    case networkFailure(Error)
    case unsupportedFormat
    
    var errorDescription: String? {
        switch self {
        case .invalidURL(let url):
            return "Invalid stream URL: \(url)"
        case .networkFailure(let error):
            return "Network error: \(error.localizedDescription)"
        case .unsupportedFormat:
            return "Unsupported stream format"
        }
    }
}

// Break down complex views
struct ContentView: View {
    var body: some View {
        NavigationStack {
            PlatformNavigationView {
                MainContentArea()
            }
        }
        .overlay(alignment: .bottom) {
            PlayerControlsOverlay()
        }
    }
}

// Extract subviews
struct MainContentArea: View {
    var body: some View {
        TabView {
            LiveTVView()
                .tabItem { Label("Live TV", systemImage: "tv") }
            
            MoviesView()
                .tabItem { Label("Movies", systemImage: "film") }
        }
    }
}

// Use @StateObject for owned objects
struct ContentView: View {
    @StateObject private var downloadManager = DownloadManager()
    
    var body: some View {
        // View content
    }
}

// Use @ObservedObject for injected dependencies
struct DownloadListView: View {
    @ObservedObject var downloadManager: DownloadManager
    
    var body: some View {
        // View content
    }
}

import XCTest
@testable import IPTVDownloader

@MainActor
final class StreamManagerTests: XCTestCase {
    var streamManager: StreamManager!
    var mockNetworkService: MockNetworkService!
    
    override func setUp() async throws {
        mockNetworkService = MockNetworkService()
        streamManager = StreamManager(networkService: mockNetworkService)
    }
    
    override func tearDown() async throws {
        streamManager = nil
        mockNetworkService = nil
    }
    
    func testStreamLoading() async throws {
        // Given
        let testURL = URL(string: "https://test.stream.url")!
        mockNetworkService.shouldSucceed = true
        
        // When
        let streamId = try await streamManager.loadStream(testURL)
        
        // Then
        XCTAssertNotNil(streamId)
        XCTAssertTrue(mockNetworkService.loadStreamCalled)
    }
}

import XCTest

final class IPTVAppUITests: XCTestCase {
    var app: XCUIApplication!
    
    override func setUp() {
        continueAfterFailure = false
        app = XCUIApplication()
        app.launchEnvironment["TESTING"] = "1"
        app.launch()
    }
    
    func testDownloadFlow() throws {
        // Navigate to Downloads
        app.tabBars.buttons["Downloads"].tap()
        
        // Verify empty state
        XCTAssertTrue(app.staticTexts["No Downloads"].exists)
        
        // Test download initiation
        // (Implementation depends on UI flow)
    }
}

#if DEBUG
class MockStreamService: StreamServiceProtocol {
    var shouldSucceed = true
    var loadStreamCalled = false
    var mockStreams: [IPTVStream] = []
    
    func loadStream(_ url: URL) async throws -> UUID {
        loadStreamCalled = true
        
        if !shouldSucceed {
            throw StreamError.networkFailure(URLError(.networkConnectionLost))
        }
        
        return UUID()
    }
    
    func fetchStreams() async throws -> [IPTVStream] {
        return mockStreams
    }
}
#endif

// Debug preprocessor macros
#if DEBUG
let isDebugBuild = true
let logLevel: LogLevel = .debug
let apiBaseURL = URL(string: "https://dev-api.example.com")!
#else
let isDebugBuild = false
let logLevel: LogLevel = .error
let apiBaseURL = URL(string: "https://api.example.com")!
#endif

// Set in Xcode Scheme → Run → Environment Variables
TESTING=1              // Enable testing mode
DEBUG_NETWORKING=1     // Verbose network logging
MOCK_STREAMS=1         // Use mock stream data
LOG_LEVEL=DEBUG        // Set logging level

// Set in Xcode Scheme → Run → Arguments Passed On Launch
-com.apple.CoreData.SQLDebug 1    // Core Data SQL logging
-com.apple.CoreData.Logging.stderr 1    // Core Data error logging

#if DEBUG
extension URLSession {
    static let debug: URLSession = {
        let config = URLSessionConfiguration.default
        config.protocolClasses = [NetworkLoggingProtocol.self]
        return URLSession(configuration: config)
    }()
}

class NetworkLoggingProtocol: URLProtocol {
    override func startLoading() {
        print("🌐 Network Request: \(request.url?.absoluteString ?? "Unknown")")
        // Log request details
    }
}
#endif

#if DEBUG
import os

class MemoryMonitor {
    private let logger = Logger(subsystem: "com.mks.iptv", category: "memory")
    
    func logMemoryUsage() {
        let info = mach_task_basic_info()
        var count = mach_msg_type_number_t(MemoryLayout<mach_task_basic_info>.size)/4
        
        let kerr: kern_return_t = withUnsafeMutablePointer(to: &info) {
            $0.withMemoryRebound(to: integer_t.self, capacity: 1) {
                task_info(mach_task_self_,
                         task_flavor_t(MACH_TASK_BASIC_INFO),
                         $0,
                         &count)
            }
        }
        
        if kerr == KERN_SUCCESS {
            let memoryUsage = Float(info.resident_size) / 1024.0 / 1024.0
            logger.debug("Memory usage: \(memoryUsage, format: .fixed(precision: 2)) MB")
        }
    }
}
#endif

import os

struct Logger {
    private let logger: os.Logger
    
    init(subsystem: String, category: String) {
        self.logger = os.Logger(subsystem: subsystem, category: category)
    }
    
    func debug(_ message: String, metadata: [String: Any] = [:]) {
        #if DEBUG
        let metadataString = metadata.map { "\($0.key)=\($0.value)" }.joined(separator: ", ")
        logger.debug("\(message) [\(metadataString)]")
        #endif
    }
    
    func error(_ message: String, error: Error? = nil) {
        logger.error("\(message) \(error?.localizedDescription ?? "")")
    }
}