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| 1 | +// |
| 2 | +// Copyright © 2025 Stream.io Inc. All rights reserved. |
| 3 | +// |
| 4 | + |
| 5 | +import Combine |
| 6 | +import Foundation |
| 7 | + |
| 8 | +/// Manages proximity-related functionality for a call, including policy management |
| 9 | +/// and proximity state observation. Only active on phone devices. |
| 10 | +final class ProximityManager: @unchecked Sendable { |
| 11 | + |
| 12 | + @Injected(\.streamVideo) private var streamVideo |
| 13 | + @Injected(\.currentDevice) private var currentDevice |
| 14 | + @Injected(\.proximityMonitor) private var proximityMonitor |
| 15 | + |
| 16 | + /// Whether proximity monitoring is supported on the current device |
| 17 | + var isSupported: Bool { currentDevice.deviceType == .phone } |
| 18 | + |
| 19 | + /// Weak reference to the associated call |
| 20 | + private weak var call: Call? |
| 21 | + /// Thread-safe storage for registered proximity policies |
| 22 | + @Atomic private var policies: [ObjectIdentifier: any ProximityPolicy] = [:] |
| 23 | + |
| 24 | + /// Cancellable for active call observation |
| 25 | + private var activeCallCancellable: AnyCancellable? |
| 26 | + /// Cancellable for proximity state observation |
| 27 | + private var observationCancellable: AnyCancellable? |
| 28 | + |
| 29 | + /// Creates a new proximity manager for the specified call |
| 30 | + /// - Parameter call: Call instance to manage proximity for |
| 31 | + init(_ call: Call) { |
| 32 | + self.call = call |
| 33 | + |
| 34 | + if isSupported { |
| 35 | + activeCallCancellable = streamVideo |
| 36 | + .state |
| 37 | + .$activeCall |
| 38 | + .sinkTask { @MainActor [weak self] in self?.didUpdateActiveCall($0) } |
| 39 | + } |
| 40 | + } |
| 41 | + |
| 42 | + deinit { |
| 43 | + activeCallCancellable?.cancel() |
| 44 | + observationCancellable?.cancel() |
| 45 | + } |
| 46 | + |
| 47 | + // MARK: - Policies |
| 48 | + |
| 49 | + /// Adds a proximity policy to be managed by this instance |
| 50 | + /// - Parameter policy: Policy to add |
| 51 | + /// - Throws: ClientError if call is nil |
| 52 | + func add(_ policy: any ProximityPolicy) throws { |
| 53 | + guard isSupported else { return } |
| 54 | + |
| 55 | + guard let call else { |
| 56 | + throw ClientError("ProximityPolicy identifier:\(policy) cannot be attached while Call is nil.") |
| 57 | + } |
| 58 | + policies[type(of: policy).identifier] = policy |
| 59 | + log.info("ProximityPolicy identifier:\(policy) has been attached on Call id:\(call.callId) type:\(call.callType).") |
| 60 | + } |
| 61 | + |
| 62 | + /// Removes a proximity policy from management |
| 63 | + /// - Parameter policy: Policy to remove |
| 64 | + func remove(_ policy: any ProximityPolicy) { |
| 65 | + guard isSupported else { return } |
| 66 | + |
| 67 | + policies[type(of: policy).identifier] = nil |
| 68 | + |
| 69 | + guard let call else { |
| 70 | + return |
| 71 | + } |
| 72 | + log.info("ProximityPolicy identifier:\(policy) has been removed from Call id:\(call.callId) type:\(call.callType).") |
| 73 | + } |
| 74 | + |
| 75 | + // MARK: - Private Helpers |
| 76 | + |
| 77 | + /// Handles active call changes by starting/stopping proximity observation |
| 78 | + /// - Parameter activeCall: New active call or nil if no active call |
| 79 | + @MainActor |
| 80 | + private func didUpdateActiveCall(_ activeCall: Call?) { |
| 81 | + if |
| 82 | + let activeCall, |
| 83 | + call?.cId == activeCall.cId, |
| 84 | + policies.isEmpty == false, |
| 85 | + observationCancellable == nil { |
| 86 | + proximityMonitor.startObservation() |
| 87 | + observationCancellable = proximityMonitor |
| 88 | + .statePublisher |
| 89 | + .removeDuplicates() |
| 90 | + .sink { [weak self] in self?.didUpdateProximity($0) } |
| 91 | + log.info("Proximity observation has started.") |
| 92 | + } else if |
| 93 | + activeCall == nil, |
| 94 | + observationCancellable != nil |
| 95 | + { |
| 96 | + observationCancellable?.cancel() |
| 97 | + observationCancellable = nil |
| 98 | + proximityMonitor.stopObservation() |
| 99 | + log.info("Proximity observation has stopped.") |
| 100 | + } else { |
| 101 | + /* No-op */ |
| 102 | + } |
| 103 | + } |
| 104 | + |
| 105 | + /// Notifies all registered policies of a proximity state change |
| 106 | + /// - Parameter proximity: New proximity state |
| 107 | + private func didUpdateProximity(_ proximity: ProximityState) { |
| 108 | + guard let call else { |
| 109 | + return |
| 110 | + } |
| 111 | + |
| 112 | + for policy in policies { |
| 113 | + policy.value.didUpdateProximity(proximity, on: call) |
| 114 | + } |
| 115 | + } |
| 116 | +} |
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