Organize Library folder a bit. Update Tracker add/edit sheet design.

1 files changed, 0 insertions, 1127 deletions

diff --git a/Hotline/Library/NetSocket/NetSocketNew.swift b/Hotline/Library/NetSocket/NetSocketNew.swift
deleted file mode 100644
index 12f4271..0000000
--- a/Hotline/Library/NetSocket/NetSocketNew.swift
+++ /dev/null
@@ -1,1127 +0,0 @@
-// NetSocket.swift
-// Dustin Mierau • @mierau
-
-import Foundation
-import Network
-
-/// Byte order for multi-byte integer values in binary protocols
-public enum Endian {
-  /// Big-endian (network byte order, most significant byte first)
-  case big
-  /// Little-endian (least significant byte first)
-  case little
-}
-
-/// Delimiter patterns for text-based protocols
-public enum Delimiter {
-  /// Custom single byte delimiter
-  case byte(UInt8)
-  /// Null terminator (0x00)
-  case zeroByte
-  /// Line feed (\n, 0x0A)
-  case lineFeed
-  /// Carriage return + line feed (\r\n, 0x0D 0x0A)
-  case carriageReturnLineFeed
-
-  /// Binary representation of this delimiter
-  var data: Data {
-    switch self {
-    case .byte(let b): return Data([b])
-    case .zeroByte: return Data([0x00])
-    case .lineFeed: return Data([0x0A])
-    case .carriageReturnLineFeed: return Data([0x0D, 0x0A])
-    }
-  }
-}
-
-/// TLS/SSL encryption policy for socket connections
-public struct TLSPolicy: Sendable {
-  /// Create a TLS-enabled policy with optional custom configuration
-  /// - Parameter configure: Optional closure to customize TLS options
-  public static func enabled(_ configure: (@Sendable (NWProtocolTLS.Options) -> Void)? = nil) -> TLSPolicy {
-    TLSPolicy(enabled: true, configure: configure)
-  }
-
-  /// Create a policy with TLS disabled (plaintext connection)
-  public static var disabled: TLSPolicy { TLSPolicy(enabled: false, configure: nil) }
-
-  /// Whether TLS is enabled
-  public let enabled: Bool
-  /// Optional TLS configuration closure
-  public let configure: (@Sendable (NWProtocolTLS.Options) -> Void)?
-}
-
-// MARK: - Errors
-
-/// Errors that can occur during socket operations
-public enum NetSocketError: Error, CustomStringConvertible, Sendable {
-  /// Socket is not yet in ready state
-  case notReady
-  /// Connection has been closed
-  case closed
-  /// Invalid port number provided
-  case invalidPort
-  /// Network operation failed with underlying error
-  case failed(underlying: Error)
-  /// Not enough data available to fulfill read request
-  case insufficientData(expected: Int, got: Int)
-  /// Frame size exceeds configured maximum
-  case framingExceeded(max: Int)
-  /// Failed to decode data
-  case decodeFailed(Error)
-  /// Failed to encode data
-  case encodeFailed(Error)
-
-  public var description: String {
-    switch self {
-    case .notReady: return "Connection not ready."
-    case .closed: return "Connection closed."
-    case .invalidPort: return "Invalid port number."
-    case .failed(let e): return "Network failure: \(e.localizedDescription)"
-    case .insufficientData(let exp, let got): return "Insufficient data: need \(exp), have \(got)."
-    case .framingExceeded(let max): return "Frame length exceeded maximum \(max)."
-    case .decodeFailed(let e): return "Decoding failed: \(e)"
-    case .encodeFailed(let e): return "Encoding failed: \(e)"
-    }
-  }
-}
-
-/// An async/await TCP socket with automatic buffering and framing support
-///
-/// NetSocket provides:
-/// - Async connection management
-/// - Automatic receive buffering with memory compaction
-/// - Type-safe reading/writing of integers, strings, and custom types
-/// - File upload/download with progress tracking
-///
-/// Example usage:
-/// ```swift
-/// let socket = try await NetSocket.connect(host: "example.com", port: 80)
-/// try await socket.write("Hello\n".data(using: .utf8)!)
-/// let response = try await socket.readUntil(delimiter: .lineFeed)
-/// ```
-public actor NetSocket {
-  /// Configuration options for the socket
-  public struct Config: Sendable {
-    /// Size of chunks to receive from network at once (default: 64 KB)
-    public var receiveChunk: Int = 64 * 1024
-    /// Maximum bytes to buffer before disconnecting (default: 8 MB)
-    public var maxBufferBytes: Int = 8 * 1024 * 1024
-    public init() {}
-  }
-
-  // Connection + state
-  private let connection: NWConnection
-  private let queue = DispatchQueue(label: "NetSocket.NWConnection")
-  private var ready = false
-  private var isClosed = false
-  private let connectionID: String  // For logging
-  
-  // Buffer with compaction
-  private var buffer = Data()
-  private var head = 0 // start of unread bytes
-  private let config: Config
-  
-  // Waiters for data/ready
-  private var dataWaiters: [CheckedContinuation<Void, Error>] = []
-  private var readyWaiters: [CheckedContinuation<Void, Error>] = []
-  
-  // MARK: Init
-  
-  private init(connection: NWConnection, config: Config) {
-    self.connection = connection
-    self.config = config
-    // Create a human-readable connection ID for logging
-    if case .hostPort(host: let h, port: let p) = connection.endpoint {
-      self.connectionID = "\(h):\(p)"
-    } else {
-      self.connectionID = "unknown"
-    }
-  }
-  
-  // MARK: Connect
-  
-  /// Connect to a remote host and return a ready socket
-  ///
-  /// This method establishes a TCP connection using Network framework types and waits until
-  /// the connection is in `.ready` state.
-  ///
-  /// - Parameters:
-  ///   - host: Network framework host (e.g., `.name("example.com", nil)` or `.ipv4(...)`)
-  ///   - port: Network framework port
-  ///   - tls: TLS policy (default: enabled with default settings)
-  ///   - config: Socket configuration (default: standard settings)
-  /// - Returns: A connected and ready `NetSocket`
-  /// - Throws: Network errors or connection failures
-  public static func connect(host: NWEndpoint.Host, port: NWEndpoint.Port, tls: TLSPolicy = .enabled(), config: Config = .init()) async throws -> NetSocket {
-    let parameters = NWParameters.tcp
-    if tls.enabled {
-      let tlsOptions = NWProtocolTLS.Options()
-      tls.configure?(tlsOptions)
-      parameters.defaultProtocolStack.applicationProtocols.insert(tlsOptions, at: 0)
-    }
-
-    let conn = NWConnection(host: host, port: port, using: parameters)
-    let socket = NetSocket(connection: conn, config: config)
-    try await socket.start()
-    return socket
-  }
-
-  /// Convenience wrapper to connect using string hostname and integer port
-  public static func connect(host: String, port: UInt16, tls: TLSPolicy = .enabled(), config: Config = .init()) async throws -> NetSocket {
-    guard let nwPort = NWEndpoint.Port(rawValue: port) else {
-      throw NetSocketError.invalidPort
-    }
-    return try await self.connect(host: .name(host, nil), port: nwPort, tls: tls, config: config)
-  }
-  
-  // MARK: Close
-
-  /// Close the connection gracefully
-  ///
-  /// Performs a graceful shutdown of the underlying network connection (e.g., TCP FIN)
-  /// and wakes all pending read/write operations with a `NetSocketError.closed` error.
-  /// This method is idempotent - subsequent calls are ignored.
-  ///
-  /// Use `forceClose()` for immediate non-graceful termination (e.g., TCP RST).
-  public func close() {
-    guard !isClosed else { return }
-    isClosed = true
-    connection.cancel()
-    resumeDataWaiters()
-    resumeReadyWaiters(with: .failure(NetSocketError.closed))
-  }
-
-  /// Force close the connection immediately (non-graceful)
-  ///
-  /// Performs an immediate non-graceful shutdown of the underlying network connection
-  /// (e.g., TCP RST). Use this when you need to terminate the connection immediately
-  /// without waiting for graceful closure. For normal shutdown, use `close()` instead.
-  ///
-  /// This method is idempotent - subsequent calls are ignored.
-  public func forceClose() {
-    guard !isClosed else { return }
-    isClosed = true
-    connection.forceCancel()
-    resumeDataWaiters()
-    resumeReadyWaiters(with: .failure(NetSocketError.closed))
-  }
-
-  // MARK: Send Data
-
-  /// Write raw data to the socket
-  ///
-  /// Sends data and waits for confirmation that it has been processed by the network stack.
-  ///
-  /// - Parameter data: Raw bytes to send
-  /// - Throws: `NetSocketError` if connection is not ready or send fails
-  @discardableResult
-  public func write(_ data: Data) async throws -> Int {
-    try await ensureReady()
-    return try await withCheckedThrowingContinuation { (cont: CheckedContinuation<Int, Error>) in
-      connection.send(content: data, completion: .contentProcessed { error in
-        if let error { cont.resume(throwing: NetSocketError.failed(underlying: error)) }
-        else { cont.resume(returning: data.count) }
-      })
-    }
-  }
-
-  /// Write a fixed-width integer to the socket
-  ///
-  /// - Parameters:
-  ///   - value: The integer value to write
-  ///   - endian: Byte order (default: big-endian)
-  /// - Throws: `NetSocketError` if write fails
-  @discardableResult
-  public func write<T: FixedWidthInteger>(_ value: T, endian: Endian = .big) async throws -> Int {
-    var v = value
-    switch endian {
-    case .big: v = T(bigEndian: value)
-    case .little: v = T(littleEndian: value)
-    }
-    var copy = v
-    let size = MemoryLayout<T>.size
-    let bytes = withUnsafePointer(to: &copy) {
-      Data(bytes: $0, count: size)
-    }
-    try await write(bytes)
-    return bytes.count
-  }
-  
-  /// Write a boolean as a single byte (0 or 1)
-  /// - Parameter value: Boolean value
-  @discardableResult
-  public func write(_ value: Bool) async throws -> Int {
-    return try await write(UInt8(value ? 0x01 : 0x00))
-  }
-  
-  /// Write a Float as its IEEE 754 bit pattern
-  /// - Parameters:
-  ///   - value: Float value
-  ///   - endian: Byte order (default: big-endian)
-  @discardableResult
-  public func write(_ value: Float, endian: Endian = .big) async throws -> Int {
-    return try await write(value.bitPattern, endian: endian)
-  }
-  
-  /// Write a Double as its IEEE 754 bit pattern
-  /// - Parameters:
-  ///   - value: Double value
-  ///   - endian: Byte order (default: big-endian)
-  @discardableResult
-  public func write(_ value: Double, endian: Endian = .big) async throws -> Int {
-    return try await write(value.bitPattern, endian: endian)
-  }
-
-  /// Write a string to the socket, optionally length-prefixed
-  ///
-  /// - Parameters:
-  ///   - string: String to write
-  ///   - encoding: Text encoding (default: UTF-8)
-  ///   - allowLossyConversion: Allow lossy encoding if necessary (default: false)
-  /// - Throws: `NetSocketError` if encoding fails or write fails
-  @discardableResult
-  public func write(_ string: String, encoding: String.Encoding = .utf8, allowLossyConversion: Bool = false) async throws -> Int {
-    guard let data = string.data(using: encoding, allowLossyConversion: allowLossyConversion) else {
-      throw NetSocketError.encodeFailed(NSError(domain: "StringEncoding", code: -1))
-    }
-    return try await write(data)
-  }
-
-  // MARK: Receive Data
-
-  /// Read data until a delimiter is found
-  ///
-  /// Searches the buffer for the delimiter pattern and returns all data up to (and optionally including)
-  /// the delimiter. The delimiter is always consumed from the stream.
-  ///
-  /// - Parameters:
-  ///   - delimiter: Binary delimiter pattern to search for
-  ///   - maxBytes: Maximum bytes to read before throwing (default: no limit)
-  ///   - includeDelimiter: Whether to include delimiter in result (default: false)
-  /// - Returns: Data read from stream
-  /// - Throws: `NetSocketError.framingExceeded` if max bytes exceeded, or connection errors
-  public func read(past delimiter: Data, maxBytes: Int? = nil, includeDelimiter: Bool = false) async throws -> Data {
-    while true {
-      try Task.checkCancellation()
-      if let r = search(delimiter: delimiter) {
-        let consumeLen = r.upperBound - head
-        let data = try await read(consumeLen)
-        return includeDelimiter ? data : data.dropLast(delimiter.count)
-      }
-      if let maxBytes, availableBytes >= maxBytes {
-        throw NetSocketError.framingExceeded(max: maxBytes)
-      }
-      try await waitForData()
-      guard !isClosed || availableBytes > 0 else { throw NetSocketError.closed }
-    }
-  }
-
-  /// Read exactly N bytes from the socket
-  ///
-  /// Waits for data to arrive if buffer doesn't contain enough bytes yet. The internal buffer
-  /// is automatically compacted after reading to prevent unbounded memory growth.
-  ///
-  /// - Parameter count: Number of bytes to read
-  /// - Returns: Exactly `count` bytes
-  /// - Throws: `NetSocketError.insufficientData` if connection closes before enough data arrives
-  public func read(_ count: Int) async throws -> Data {
-    try await self.ensureReadable(count)
-    let start = self.head
-    let end = self.head + count
-    let slice = self.buffer[start..<end]
-    self.head = end
-    self.compactIfNeeded()
-    return Data(slice)
-  }
-  
-  /// Read a fixed-width integer from the socket
-  ///
-  /// - Parameters:
-  ///   - type: Integer type to read
-  ///   - endian: Byte order (default: big-endian)
-  /// - Returns: The integer value
-  /// - Throws: `NetSocketError` if insufficient data or connection closed
-  public func read<T: FixedWidthInteger>(_ type: T.Type = T.self, endian: Endian = .big) async throws -> T {
-    let size = MemoryLayout<T>.size
-    let data = try await self.read(size)
-    let value: T = data.withUnsafeBytes { raw in
-      raw.load(as: T.self)
-    }
-    switch endian {
-    case .big: return T(bigEndian: value)
-    case .little: return T(littleEndian: value)
-    }
-  }
-
-  /// Read a fixed-length string
-  ///
-  /// - Parameters:
-  ///   - length: Number of bytes to read
-  ///   - encoding: Text encoding (default: UTF-8)
-  /// - Returns: Decoded string
-  /// - Throws: `NetSocketError` if decoding fails or insufficient data
-  public func read(_ length: Int, encoding: String.Encoding = .utf8) async throws -> String {
-    let data = try await self.read(length)
-    guard let s = String(data: data, encoding: encoding) else {
-      throw NetSocketError.decodeFailed(NSError())
-    }
-    return s
-  }
-
-  /// Read a string until a delimiter is found
-  ///
-  /// - Parameters:
-  ///   - delimiter: Delimiter pattern to search for
-  ///   - maxBytes: Maximum bytes to read before throwing (default: no limit)
-  ///   - includeDelimiter: Whether to include delimiter in result (default: false)
-  /// - Returns: String read from stream (delimiter consumed but not included unless specified)
-  /// - Throws: `NetSocketError` if decoding fails, max bytes exceeded, or connection closed
-  public func read(until delimiter: Delimiter, maxBytes: Int? = nil, includeDelimiter: Bool = false) async throws -> String {
-    let bytes = try await read(past: delimiter.data, maxBytes: maxBytes, includeDelimiter: includeDelimiter)
-    guard let s = String(data: bytes, encoding: .utf8) else { throw NetSocketError.decodeFailed(NSError()) }
-    return s
-  }
-
-  /// Read exactly N bytes with progress callbacks
-  ///
-  /// Like `read(_:)`, but reads in chunks and reports progress after each chunk.
-  /// Useful for downloading large amounts of data where you want to update UI progress.
-  ///
-  /// Example:
-  /// ```swift
-  /// let data = try await socket.read(1_000_000) { current, total in
-  ///   print("Progress: \(current)/\(total)")
-  /// }
-  /// ```
-  ///
-  /// - Parameters:
-  ///   - count: Number of bytes to read
-  ///   - chunkSize: Size of chunks to read at a time (default: 8192)
-  ///   - progress: Optional callback with (bytesReceived, totalBytes)
-  /// - Returns: Exactly `count` bytes
-  /// - Throws: `NetSocketError` if connection closes before enough data arrives
-  public func read(
-    _ count: Int,
-    chunkSize: Int = 8192,
-    progress: (@Sendable (Int, Int) -> Void)? = nil
-  ) async throws -> Data {
-    var data = Data()
-    data.reserveCapacity(count)
-    var received = 0
-
-    while received < count {
-      try Task.checkCancellation()
-      let toRead = min(chunkSize, count - received)
-      let chunk = try await read(toRead)
-      data.append(chunk)
-      received += chunk.count
-      progress?(received, count)
-    }
-
-    return data
-  }
-  
-  // MARK: Peek Data
-  
-  public var availableBytes: Int { self.buffer.count - self.head }
-
-  public func peek(_ count: Int) -> Data? {
-    guard self.availableBytes >= count else {
-      return nil
-    }
-    
-    let slice = self.buffer[self.head..<(self.head + count)]
-    return Data(slice) // Don't advance head
-  }
-  
-  public func peek(upto count: Int) -> Data {
-    let amount = min(self.availableBytes, count)
-    guard amount > 0 else {
-      return Data()
-    }
-    
-    let slice = self.buffer[self.head..<(self.head + amount)]
-    return Data(slice)
-  }
-  
-  public func peek(awaiting count: Int) async throws -> Data {
-    try await self.ensureReadable(count)
-    let slice = self.buffer[self.head..<(self.head + count)]
-    return Data(slice) // Don't advance head
-  }
-  
-  // MARK: Skip Data
-  
-  /// Skip/discard exactly N bytes from the stream without allocating memory
-  public func skip(_ count: Int) async throws {
-    guard count > 0 else { return }
-    try await self.ensureReadable(count)
-    self.head += count
-    self.compactIfNeeded()
-  }
-  
-  /// Skip until delimiter is found (discards delimiter too)
-  public func skip(past delimiter: Data) async throws {
-    while true {
-      try Task.checkCancellation()
-      if let r = self.search(delimiter: delimiter) {
-        self.head = r.upperBound  // Skip to end of delimiter
-        self.compactIfNeeded()
-        return
-      }
-      try await self.waitForData()
-      guard !self.isClosed else {
-        throw NetSocketError.closed
-      }
-    }
-  }
-  
-  // MARK: Files
-  
-  /// Upload a file from a URL, yielding progress as an AsyncSequence.
-  ///
-  /// Iterating this sequence drives the transfer. Each yielded value reports
-  /// the total bytes sent so far and the known total. Cancel the consuming
-  /// task to cancel the transfer.
-  ///
-  /// This method handles opening and closing the file handle automatically.
-  ///
-  /// - Parameters:
-  ///   - url: File URL to upload.
-  ///   - chunkSize: Size of each read chunk.
-  /// - Returns: An `AsyncThrowingStream` of `FileProgress` updates.
-  func writeFile(from url: URL, chunkSize: Int = 256 * 1024) -> AsyncThrowingStream<FileProgress, Error> {
-    // This stream wrapper manages the FileHandle's lifetime.
-    return AsyncThrowingStream(bufferingPolicy: .bufferingOldest(1)) { continuation in
-      // Capture self (the actor) to use in detached task
-      let actor = self
-      
-      // Open file on a background thread (file I/O is blocking)
-      let task = Task.detached {
-        let fh: FileHandle
-        let total: Int
-        
-        // 1. Open file and get length (blocking I/O, done off-actor)
-        do {
-          total = Int(try NetSocket.fileLength(at: url))
-          fh = try FileHandle(forReadingFrom: url)
-        } catch {
-          continuation.finish(throwing: NetSocketError.failed(underlying: error))
-          return
-        }
-        
-        // 2. Now switch to the actor context to call the actor-isolated method
-        let stream = await actor.writeFile(
-          from: fh,
-          length: total,
-          chunkSize: chunkSize
-        )
-        
-        // 3. Forward all elements from the underlying stream to our stream
-        do {
-          for try await progress in stream {
-            try Task.checkCancellation() // Exit early if cancelled
-            continuation.yield(progress)
-          }
-          try? fh.close()
-          continuation.finish()
-        } catch is CancellationError {
-          try? fh.close()
-          continuation.finish()
-        } catch {
-          try? fh.close()
-          continuation.finish(throwing: error)
-        }
-      }
-      
-      // If the *consumer* cancels the stream, we cancel our managing task.
-      continuation.onTermination = { @Sendable _ in
-        task.cancel()
-      }
-    }
-  }
-  
-  /// Upload a file from an open FileHandle, yielding progress as an AsyncSequence.
-  ///
-  /// Iterating this sequence drives the transfer. Each yielded value reports
-  /// the total bytes sent so far and the known total. Cancel the consuming
-  /// task to cancel the transfer.
-  ///
-  /// **Note:** The caller is responsible for opening and closing the `fileHandle`.
-  ///
-  /// - Parameters:
-  ///   - fileHandle: Open `FileHandle` for reading.
-  ///   - length: Exact number of bytes to send (total file size).
-  ///   - chunkSize: Size of each read chunk.
-  /// - Returns: An `AsyncThrowingStream` of `FileProgress` updates.
-  func writeFile(from fileHandle: FileHandle, length: Int, chunkSize: Int = 256 * 1024) -> AsyncThrowingStream<FileProgress, Error> {
-    precondition(length >= 0, "length must be >= 0")
-    
-    if length == 0 {
-      return AsyncThrowingStream { continuation in
-        continuation.yield(.init(sent: 0, total: 0, bytesPerSecond: 0, estimatedTimeRemaining: 0))
-        continuation.finish()
-      }
-    }
-    
-    return AsyncThrowingStream(bufferingPolicy: .bufferingOldest(1)) { continuation in
-      let task = Task { [weak self] in
-        guard let self else {
-          continuation.finish()
-          return
-        }
-        
-        var estimator = TransferRateEstimator(total: Int(length))
-        
-        do {
-          try await self.ensureReady()
-          
-          while estimator.transferred < length {
-            try Task.checkCancellation()
-            
-            let toRead = Int(min(chunkSize, length - estimator.transferred))
-            
-            // Read from disk
-            guard let chunk = try fileHandle.read(upToCount: toRead), !chunk.isEmpty else {
-              if estimator.transferred < length {
-                throw NetSocketError.failed(underlying: NSError(
-                  domain: "NetSocket", code: 9001,
-                  userInfo: [NSLocalizedDescriptionKey: "File read ended prematurely. Expected \(length) bytes, got \(estimator.transferred)."]
-                ))
-              }
-              break
-            }
-            
-            // Write to network
-            try await self.write(chunk)
-            
-            // Update estimator and yield progress
-            let progress = estimator.update(bytes: chunk.count)
-            continuation.yield(progress)
-          }
-          
-          continuation.finish()
-        } catch {
-          continuation.finish(throwing: error)
-        }
-      }
-      
-      continuation.onTermination = { @Sendable _ in
-        task.cancel()
-      }
-    }
-  }
-  
-  /// Receive a file of known length and yield progress updates as an AsyncSequence.
-  ///
-  /// Iterating this sequence drives the transfer. Each yielded value reports
-  /// the total bytes written so far and the known total. Cancel the consuming
-  /// task to cancel the transfer.
-  ///
-  /// - Parameters:
-  ///   - fileHandle: Open `FileHandle` for writing (caller must close).
-  ///   - length: Exact number of bytes expected.
-  ///   - chunkSize: Size of each read chunk.
-  /// - Returns: An `AsyncThrowingStream` of `FileProgress` updates.
-  func receiveFile(to fileHandle: FileHandle, length: Int, chunkSize: Int = 256 * 1024) -> AsyncThrowingStream<FileProgress, Error> {
-    precondition(length >= 0, "length must be >= 0")
-    
-    if length == 0 {
-      return AsyncThrowingStream { continuation in
-        continuation.yield(.init(sent: 0, total: 0, bytesPerSecond: 0, estimatedTimeRemaining: 0))
-        continuation.finish()
-      }
-    }
-    
-    return AsyncThrowingStream(bufferingPolicy: .bufferingOldest(1)) { continuation in
-      let task = Task { [weak self] in
-        guard let self else {
-          continuation.finish()
-          return
-        }
-        
-        var estimator = TransferRateEstimator(total: length)
-        
-        do {
-          var remaining: Int = length
-          
-          while remaining > 0 {
-            try Task.checkCancellation()
-            let n = min(chunkSize, remaining)
-            
-            let chunk = try await self.read(n)
-            try fileHandle.write(contentsOf: chunk)
-            
-            let chunkSize = Int(chunk.count)
-            remaining -= chunkSize
-            let progress = estimator.update(bytes: chunkSize)
-            continuation.yield(progress)
-          }
-          
-          continuation.finish()
-        } catch {
-          continuation.finish(throwing: error)
-        }
-      }
-      
-      continuation.onTermination = { @Sendable _ in
-        task.cancel()
-      }
-    }
-  }
-  
-  /// Download a file of known length and write it to disk in chunks
-  ///
-  /// This method does **not** read a length prefix. The caller must provide the expected
-  /// file size (e.g., from protocol metadata). The file is streamed directly to disk to
-  /// avoid loading it entirely into memory.
-  ///
-  /// Supports atomic writes: when enabled, data is written to a temporary `.part` file and
-  /// renamed on success. If an error occurs, the temporary file is automatically cleaned up.
-  ///
-  /// - Parameters:
-  ///   - url: Destination file URL
-  ///   - length: Exact number of bytes to read (must match what's on the wire)
-  ///   - chunkSize: Chunk size for reading/writing (default: 256 KB)
-  ///   - overwrite: Whether to overwrite existing file (default: true)
-  ///   - atomic: Write to temporary file and rename on success (default: true)
-  ///   - progress: Optional progress callback
-  /// - Returns: Total bytes written (equals `length` on success)
-  /// - Throws: File I/O or network errors. On atomic writes, partial files are cleaned up.
-  ///
-  /// Example:
-  /// ```swift
-  /// // Hotline protocol: file size comes from transaction header
-  /// let transaction = try await socket.receive(HotlineTransaction.self)
-  /// try await socket.receiveFile(
-  ///     to: destinationURL,
-  ///     length: transaction.fileSize
-  /// )
-  /// ```
-  @discardableResult
-  func receiveFile(
-    to url: URL,
-    length: Int,
-    chunkSize: Int = 256 * 1024,
-    overwrite: Bool = true,
-    atomic: Bool = true,
-    progress: (@Sendable (FileProgress) -> Void)? = nil
-  ) async throws -> Int {
-    precondition(length >= 0, "length must be >= 0")
-        
-    // Fast path: nothing to do
-    if length == 0 {
-      if overwrite { try? FileManager.default.removeItem(at: url) }
-      FileManager.default.createFile(atPath: url.path, contents: Data(), attributes: nil)
-      return 0
-    }
-    
-    // Prepare destination (optionally atomic)
-    let fm = FileManager.default
-    let dir = url.deletingLastPathComponent()
-    let tmp = atomic ? dir.appendingPathComponent(".\(url.lastPathComponent).part-\(UUID().uuidString)") : url
-    
-    if overwrite { try? fm.removeItem(at: tmp) }
-    if overwrite, !atomic { try? fm.removeItem(at: url) }
-    
-    // Create and open the file for writing
-    fm.createFile(atPath: tmp.path, contents: nil, attributes: nil)
-    let fh = try FileHandle(forWritingTo: tmp)
-    defer { try? fh.close() }
-    
-    var remaining: Int = length
-    var written: Int = 0
-    
-    do {
-      while remaining > 0 {
-        try Task.checkCancellation()
-        let n = Int(min(chunkSize, remaining))
-        let chunk = try await self.read(n)
-        try fh.write(contentsOf: chunk)
-        remaining -= n
-        written += Int(n)
-        progress?(.init(sent: written, total: length))
-      }
-    } catch {
-      // Cleanup partial file on failure if we were writing atomically
-      if atomic { try? fm.removeItem(at: tmp) }
-      throw error
-    }
-    
-    // Atomically move into place if requested
-    if atomic {
-      if overwrite { try? fm.removeItem(at: url) }
-      try fm.moveItem(at: tmp, to: url)
-    }
-    
-    return written
-  }
-  
-  // MARK: Internals
-  
-  private func start() async throws {
-    self.connection.stateUpdateHandler = { state in
-      Task { [weak self] in
-        guard let self else { return }
-        switch state {
-        case .ready:
-          await self.setReady()
-          await self.resumeReadyWaiters(with: .success(()))
-        case .failed(let error):
-          await self.failAllWaiters(NetSocketError.failed(underlying: error))
-          await self.setClosed()
-        case .waiting(let error):
-          // bubble as transient failure for awaiters; reconnect logic could live here
-          await self.resumeReadyWaiters(with: .failure(NetSocketError.failed(underlying: error)))
-        case .cancelled:
-          await self.failAllWaiters(NetSocketError.closed)
-          await self.setClosed()
-        default:
-          break
-        }
-      }
-    }
-    
-    // Kick off receive loop after .start
-    self.connection.start(queue: queue)
-    try await self.waitUntilReady()
-    self.startReceiveLoop()
-  }
-  
-  private func startReceiveLoop() {
-    @Sendable func loop(_ connection: NWConnection, chunk: Int, owner: NetSocket, connID: String) {
-      print("NetSocket[\(connID)]: Calling connection.receive(\(chunk)) to request more data...")
-      
-      connection.receive(minimumIncompleteLength: 1, maximumLength: chunk) { [weak owner] data, _, isComplete, error in
-        print("NetSocket[\(connID)]: Receive callback - data: \(data?.count ?? 0) bytes, isComplete: \(isComplete), error: \(String(describing: error))")
-        Task {
-          guard let o = owner else {
-            return
-          }
-          
-          if let error {
-            await o.handleReceiveError(error)
-            return
-          }
-          if let data, !data.isEmpty {
-            await o.append(data, connID: connID)
-          }
-          if isComplete {
-            print("NetSocket[\(connID)]: EOF from peer.")
-            await o.handleEOF()
-            return
-          }
-          loop(connection, chunk: chunk, owner: o, connID: connID)
-        }
-      }
-    }
-    loop(connection, chunk: self.config.receiveChunk, owner: self, connID: connectionID)
-  }
-  
-  private func handleReceiveError(_ error: Error) {
-    self.isClosed = true
-    self.failAllWaiters(NetSocketError.failed(underlying: error))
-  }
-  
-  private func handleEOF() {
-    self.isClosed = true
-    let waiters = self.dataWaiters
-    self.dataWaiters.removeAll()
-    for w in waiters {
-      w.resume()
-    } // wake so readers can observe closure
-  }
-  
-  private func setReady() {
-    self.ready = true
-  }
-  
-  private func setClosed() {
-    self.isClosed = true
-  }
-  
-  private func ensureReady() async throws {
-    if self.isClosed {
-      throw NetSocketError.closed
-    }
-    if !self.ready {
-      try await self.waitUntilReady()
-    }
-  }
-  
-  private func ensureReadable(_ count: Int) async throws {
-    try await self.ensureReady()
-    while self.availableBytes < count {
-      try Task.checkCancellation()
-      if self.isClosed {
-        throw NetSocketError.insufficientData(expected: count, got: self.availableBytes)
-      }
-      try await self.waitForData()
-    }
-  }
-  
-  private func waitForData() async throws {
-    try Task.checkCancellation()
-    try await withCheckedThrowingContinuation { (cont: CheckedContinuation<Void, Error>) in
-      if self.isClosed {
-        cont.resume()
-        return
-      }
-      self.dataWaiters.append(cont)
-    }
-  }
-  
-  private func compactIfNeeded() {
-    // Avoid unbounded memory as head advances
-    if self.head > 64 * 1024 && self.head > self.buffer.count / 2 {
-      self.buffer.removeSubrange(0..<self.head)
-      self.head = 0
-    }
-  }
-  
-  private func search(delimiter: Data) -> Range<Int>? {
-    guard !delimiter.isEmpty, availableBytes >= delimiter.count else { return nil }
-    let hay = buffer[head..<buffer.count]
-    
-    // Fast path for single-byte delimiters
-    if delimiter.count == 1, let byte = delimiter.first {
-      if let idx = hay.firstIndex(of: byte) {
-        let pos = head + hay.distance(from: hay.startIndex, to: idx)
-        return pos..<(pos + 1)
-      }
-      return nil
-    }
-    
-    // General case
-    if let r = hay.firstRange(of: delimiter) {
-      let lower = head + hay.distance(from: hay.startIndex, to: r.lowerBound)
-      let upper = head + hay.distance(from: hay.startIndex, to: r.upperBound)
-      return lower..<upper
-    }
-    
-    return nil
-  }
-  
-  private static func fileLength(at url: URL) throws -> Int64 {
-    let values = try url.resourceValues(forKeys: [.isRegularFileKey, .fileSizeKey])
-    guard values.isRegularFile == true else {
-      throw NetSocketError.failed(underlying: NSError(
-        domain: "NetSocket", code: 1001,
-        userInfo: [NSLocalizedDescriptionKey: "Not a regular file: \(url.path)"]
-      ))
-    }
-    if let s = values.fileSize { return Int64(s) }
-    let attrs = try FileManager.default.attributesOfItem(atPath: url.path)
-    if let n = attrs[.size] as? NSNumber {
-      return n.int64Value
-    }
-    throw NetSocketError.failed(underlying: NSError(
-      domain: "NetSocket", code: 1002,
-      userInfo: [NSLocalizedDescriptionKey: "Unable to determine file size for \(url.lastPathComponent)"]
-    ))
-  }
-  
-  private func waitUntilReady() async throws {
-    guard !self.ready else { return }
-    try await withCheckedThrowingContinuation { (cont: CheckedContinuation<Void, Error>) in
-      self.readyWaiters.append(cont)
-    }
-  }
-  
-  private func resumeReadyWaiters(with result: Result<Void, Error>) {
-    let waiters = self.readyWaiters
-    self.readyWaiters.removeAll()
-    for w in waiters {
-      switch result {
-      case .success: w.resume()
-      case .failure(let e): w.resume(throwing: e)
-      }
-    }
-  }
-  
-  private func failAllWaiters(_ error: Error) {
-    self.resumeReadyWaiters(with: .failure(error))
-    let waiters = self.dataWaiters
-    self.dataWaiters.removeAll()
-    for w in waiters {
-      w.resume(throwing: error)
-    }
-  }
-  
-  private func append(_ data: Data, connID: String) {
-    print("NetSocket[\(connID)]: Received \(data.count) bytes from network, buffer now has \(buffer.count - head + data.count) available")
-    buffer.append(data)
-    if buffer.count - head > config.maxBufferBytes {
-      // Hard stop: drop connection rather than OOM'ing.
-      isClosed = true
-      connection.cancel()
-      failAllWaiters(NetSocketError.framingExceeded(max: config.maxBufferBytes))
-      return
-    }
-    resumeDataWaiters()
-  }
-  
-  private func resumeDataWaiters() {
-    let waiters = dataWaiters
-    dataWaiters.removeAll()
-    for w in waiters { w.resume() }
-  }
-}
-
-// MARK: - Utilities
-
-private extension Data {
-  mutating func appendInteger<T: FixedWidthInteger>(_ value: T, endian: Endian) throws {
-    var v = value
-    switch endian {
-    case .big: v = T(bigEndian: value)
-    case .little: v = T(littleEndian: value)
-    }
-    var copy = v
-    withUnsafePointer(to: &copy) { ptr in
-      self.append(contentsOf: UnsafeRawBufferPointer(start: ptr, count: MemoryLayout<T>.size))
-    }
-  }
-}
-
-// MARK: - NetSocketEncodable
-
-/// Protocol for types that can encode themselves to binary data
-///
-/// Types conforming to `NetSocketEncodable` produce binary data that can be sent over
-/// a socket. Unlike writing field-by-field to the socket, encodable types build complete
-/// binary messages that are sent in a single write operation for efficiency.
-///
-/// Example:
-/// ```swift
-/// struct MyMessage: NetSocketEncodable {
-///   let id: UInt32
-///   let name: String
-///
-///   func encode(endian: Endian) throws -> Data {
-///     var data = Data()
-///     // Encode fields to data...
-///     return data
-///   }
-/// }
-///
-/// try await socket.send(message)
-/// ```
-public protocol NetSocketEncodable: Sendable {
-  /// Encode this value to binary data
-  ///
-  /// Implementations should build a complete binary message and return it as Data.
-  /// The data will be sent to the socket in a single write operation.
-  ///
-  /// - Parameter endian: Byte order for multi-byte values
-  /// - Returns: Encoded binary data ready to send
-  /// - Throws: Encoding errors
-  func encode(endian: Endian) throws -> Data
-}
-
-/// Protocol for types that can decode themselves directly from a socket stream
-///
-/// Types conforming to `NetSocketDecodable` read field-by-field directly from the socket
-/// using async reads. This enables true streaming without buffering entire messages.
-///
-/// **Important**: If decoding throws after consuming some bytes (e.g., validation fails),
-/// the socket will be left with those bytes consumed. In practice, this usually means the
-/// connection should be closed. For most protocols this is acceptable since decode errors
-/// indicate corrupt data or protocol violations.
-///
-/// Example:
-/// ```swift
-/// struct MyMessage: NetSocketDecodable {
-///   let id: UInt32
-///   let name: String
-///
-///   init(from socket: NetSocket, endian: Endian) async throws {
-///     self.id = try await socket.read(UInt32.self, endian: endian)
-///     let nameLen = try await socket.read(UInt16.self, endian: endian)
-///     let nameData = try await socket.readExactly(Int(nameLen))
-///     guard let name = String(data: nameData, encoding: .utf8) else {
-///       throw NetSocketError.decodeFailed(NSError())
-///     }
-///     self.name = name
-///   }
-/// }
-///
-/// let message = try await socket.receive(MyMessage.self)
-/// ```
-public protocol NetSocketDecodable: Sendable {
-  /// Decode a value by reading directly from the socket stream
-  ///
-  /// This initializer should read all necessary fields from the socket using
-  /// methods like `read(_:endian:)`, `readExactly(_:)`, `readString(length:)`, etc.
-  ///
-  /// The socket handles waiting for data to arrive, so you can read field by field
-  /// without worrying about buffering.
-  ///
-  /// - Parameters:
-  ///   - socket: Socket to read from
-  ///   - endian: Byte order for multi-byte values
-  /// - Throws: Network errors, insufficient data, or custom decoding errors
-  init(from socket: NetSocket, endian: Endian) async throws
-}
-
-public extension NetSocket {
-  /// Send an encodable value to the socket
-  ///
-  /// The type encodes itself to binary data, which is then sent in a single write operation.
-  ///
-  /// Example:
-  /// ```swift
-  /// struct MyMessage: NetSocketEncodable {
-  ///   let id: UInt32
-  ///   let name: String
-  ///
-  ///   func encode(endian: Endian) throws -> Data {
-  ///     var data = Data()
-  ///     // Build binary message...
-  ///     return data
-  ///   }
-  /// }
-  ///
-  /// try await socket.send(message)
-  /// ```
-  ///
-  /// - Parameters:
-  ///   - value: Value conforming to NetSocketEncodable
-  ///   - endian: Byte order (default: big-endian)
-  /// - Throws: Encoding or network errors
-  func send<T: NetSocketEncodable>(_ value: T, endian: Endian = .big) async throws {
-    let data = try value.encode(endian: endian)
-    try await self.write(data)
-  }
-
-  /// Receive and decode a value directly from the socket stream (no length prefix)
-  ///
-  /// The type reads field-by-field from the socket as needed, enabling true streaming
-  /// without buffering entire messages. Useful for protocols where message size isn't
-  /// known upfront or for progressive decoding.
-  ///
-  /// Example:
-  /// ```swift
-  /// struct ServerEntry: NetSocketDecodable {
-  ///   let id: UInt32
-  ///   let name: String
-  ///
-  ///   init(from socket: NetSocket, endian: Endian) async throws {
-  ///     self.id = try await socket.read(UInt32.self, endian: endian)
-  ///     // Read variable-length string...
-  ///   }
-  /// }
-  ///
-  /// let entry = try await socket.receive(ServerEntry.self)
-  /// ```
-  ///
-  /// - Parameters:
-  ///   - type: Type conforming to NetSocketDecodable
-  ///   - endian: Byte order (default: big-endian)
-  /// - Returns: Decoded value
-  /// - Throws: Decoding or network errors
-  func receive<T: NetSocketDecodable>(_ type: T.Type, endian: Endian = .big) async throws -> T {
-    return try await T(from: self, endian: endian)
-  }
-}