57 lines
3.2 KiB
Swift
57 lines
3.2 KiB
Swift
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import Foundation
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enum SystemPlayerAction { case play, pause, next, previous, seek, volume }
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@MainActor
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final class SystemPlayerTransport {
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private var busy = false
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func send(_ action: SystemPlayerAction, value: Double? = nil, sessionID: String) async throws -> MediaState {
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guard !busy else { throw BridgeError.message("Предыдущая команда ещё выполняется.") }
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busy = true
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defer { busy = false }
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let saved = try SystemPlayerCredentials.load(sessionID)
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let client = BridgeClient(saved, timeout: 5)
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defer { client.close() }
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return try await Self.execute(action, value: value, client: client) {
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let current = try SystemPlayerCredentials.load(sessionID)
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guard current.endpoint == saved.endpoint, current.fingerprint == saved.fingerprint, current.token == saved.token else {
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throw BridgeError.unauthorized
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}
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}
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}
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static func execute(_ action: SystemPlayerAction, value: Double? = nil, client: BridgeClient,
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validate: () throws -> Void = {}) async throws -> MediaState {
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let state = try await client.state()
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try validate()
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let command = try command(action, value: value, state: state)
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do { try await client.command(command) }
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catch {
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if error is URLError { throw BridgeError.message("Результат команды неизвестен. Откройте плеер перед повтором.") }
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throw error
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}
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do { return try await client.state() }
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catch {
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if case BridgeError.unauthorized = error { throw error }
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throw BridgeError.message("Команда выполнена, но новый трек не получен. Откройте приложение для обновления.")
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}
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}
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static func command(_ action: SystemPlayerAction, value: Double?, state: MediaState) throws -> Command {
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switch action {
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case .play where state.hasSession && state.capabilities.play: return Command(type: "play", value: nil)
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case .pause where state.hasSession && state.capabilities.pause: return Command(type: "pause", value: nil)
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case .next where state.hasSession && state.capabilities.next: return Command(type: "next", value: nil)
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case .previous where state.hasSession && state.capabilities.previous: return Command(type: "previous", value: nil)
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case .seek where state.hasSession && state.capabilities.seek && state.maxSeekSeconds > state.minSeekSeconds:
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guard let value, value.isFinite else { throw BridgeError.message("Некорректная позиция трека.") }
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return Command(type: "seek", value: min(state.maxSeekSeconds, max(state.minSeekSeconds, state.startSeconds + value)))
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case .volume where state.volume != nil:
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guard let value, value.isFinite else { throw BridgeError.message("Некорректная громкость.") }
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return Command(type: "volume", value: min(1, max(0, value)))
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default: throw BridgeError.message("Плеер на ПК не поддерживает эту команду.")
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}
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}
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}
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