//===----------------------------------------------------------------------===//
// Copyright © 2026 Apple Inc. and the container project authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//===----------------------------------------------------------------------===//

#if os(macOS)

/// Represents a single client connection on the server side.
///
/// The server creates one `XPCServerSession` per accepted client connection.
/// Handlers that need to associate state with a connection (e.g. resource
/// tracking for automatic cleanup) receive the session as a parameter and
/// may register disconnect handlers via `onDisconnect(_:)`.
public actor XPCServerSession {
    private var disconnectHandlers: [@Sendable () async -> Void] = []

    public init() {}

    /// Register a handler to be called when the client connection closes.
    public func onDisconnect(_ handler: @Sendable @escaping () async -> Void) {
        disconnectHandlers.append(handler)
    }

    func fireDisconnect() async {
        for handler in disconnectHandlers { await handler() }
    }
}

extension XPCServerSession: Hashable {
    public nonisolated static func == (lhs: XPCServerSession, rhs: XPCServerSession) -> Bool {
        lhs === rhs
    }

    public nonisolated func hash(into hasher: inout Hasher) {
        hasher.combine(ObjectIdentifier(self))
    }
}

#endif
