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// Copyright (C) 2021-2023 Apple Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
// BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
#if ENABLE_MEDIA_SESSION_COORDINATOR && HAVE_GROUP_ACTIVITIES
import AVFoundation
import Combine
import Foundation
#if USE_APPLE_INTERNAL_SDK
@_spi(Safari) @_weakLinked import GroupActivities
#else
import GroupActivities
#if compiler(>=6.0)
internal import GroupActivities_SPI
#else
@_implementationOnly import GroupActivities_SPI
#endif
#endif
extension WKGroupSessionState {
fileprivate init(_ state: GroupSession<URLActivity>.State) {
switch state {
case .waiting:
self = .waiting
case .joined:
self = .joined
case .invalidated:
self = .invalidated
@unknown default:
// Unanticipated state value.
assertionFailure()
self = .invalidated
}
}
}
@_objcImplementation
extension WKURLActivity {
// Used to workaround the fact that `@_objcImplementation` does not support stored properties whose size can change
// due to Library Evolution. Do not use this property directly.
@nonobjc
private var backingURLActivity: Any
@nonobjc
final private var urlActivity: URLActivity {
// Safe force-unwrap because `backingURLActivity` is only set once from the initializer with a known type.
// swift-format-ignore: NeverForceUnwrap
backingURLActivity as! URLActivity
}
var fallbackURL: URL? { urlActivity.webpageURL }
@nonobjc
fileprivate convenience init(activity: URLActivity) {
self.init()
self.backingURLActivity = activity as Any
}
#if compiler(<6.0)
@objc
deinit {}
#endif
}
@_objcImplementation
extension WKGroupSession {
@nonobjc
private var groupSession: GroupSession<URLActivity>
@nonobjc
private var backingActivity: WKURLActivity
@nonobjc
private var cancellables: Set<AnyCancellable> = []
@nonobjc
fileprivate convenience init(groupSession: GroupSession<URLActivity>) {
self.init()
self.groupSession = groupSession
self.backingActivity = .init(activity: groupSession.activity)
self.groupSession.$activity
.sink { [unowned self] in self.activityChanged(activity: $0) }
.store(in: &cancellables)
self.groupSession.$state
.sink { [unowned self] in self.stateChanged(state: $0) }
.store(in: &cancellables)
}
var activity: WKURLActivity { backingActivity }
var uuid: UUID { groupSession.id }
var state: WKGroupSessionState {
WKGroupSessionState(groupSession.state)
}
var newActivityCallback: ((WKURLActivity) -> Void)?
var stateChangedCallback: ((WKGroupSessionState) -> Void)?
func join() {
groupSession.join()
}
func leave() {
groupSession.leave()
}
@objc(coordinateWithCoordinator:)
func coordinate(with coordinator: AVPlaybackCoordinator) {
coordinator.coordinateWithSession(groupSession)
}
@nonobjc
private final func activityChanged(activity: URLActivity) {
backingActivity = .init(activity: groupSession.activity)
guard let callback = newActivityCallback else {
return
}
callback(backingActivity)
}
@nonobjc
private final func stateChanged(state: GroupSession<URLActivity>.State) {
guard let callback = stateChangedCallback else {
return
}
callback(.init(state))
}
#if compiler(<6.0)
@objc
deinit {}
#endif
}
@_objcImplementation
extension WKGroupSessionObserver {
@nonobjc
private var incomingSessionsTask: Task<Void, Never>?
var newSessionCallback: ((WKGroupSession) -> Void)?
override init() {
super.init()
incomingSessionsTask = Task { [weak self] in
for await newSession in URLActivity.sessions() {
self?.receivedSession(newSession)
}
}
}
@nonobjc
final private func receivedSession(_ session: GroupSession<URLActivity>) {
guard let callback = newSessionCallback else {
return
}
callback(.init(groupSession: session))
}
#if compiler(<6.0)
@objc
deinit {}
#endif
}
#endif // ENABLE_MEDIA_SESSION_COORDINATOR && HAVE_GROUP_ACTIVITIES
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