168 lines
5.7 KiB
Swift
168 lines
5.7 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import SwiftUI
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typealias SessionVerificationViewModelType = StateStoreViewModel<SessionVerificationViewState, SessionVerificationViewAction>
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class SessionVerificationViewModel: SessionVerificationViewModelType, SessionVerificationViewModelProtocol {
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// MARK: - Properties
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// MARK: Private
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private let sessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol
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private var stateMachine: SessionVerificationStateMachine
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// MARK: Public
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var callback: ((SessionVerificationViewModelAction) -> Void)?
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// MARK: - Setup
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init(sessionVerificationControllerProxy: SessionVerificationControllerProxyProtocol,
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initialState: SessionVerificationViewState = SessionVerificationViewState()) {
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self.sessionVerificationControllerProxy = sessionVerificationControllerProxy
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stateMachine = SessionVerificationStateMachine()
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super.init(initialViewState: initialState)
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setupStateMachine()
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sessionVerificationControllerProxy.callbacks
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.receive(on: DispatchQueue.main)
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.sink { [weak self] callback in
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guard let self = self else { return }
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switch callback {
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case .receivedVerificationData(let emojis):
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guard self.stateMachine.state == .requestingVerification else {
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MXLog.warning("[SessionVerificationViewModel] callbacks: Ignoring receivedVerificationData due to invalid state.")
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return
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}
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self.stateMachine.processEvent(.didReceiveChallenge(emojis: emojis))
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case .finished:
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self.stateMachine.processEvent(.didAcceptChallenge)
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case .cancelled:
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self.stateMachine.processEvent(.didCancel)
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case .failed:
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self.stateMachine.processEvent(.didFail)
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}
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}.store(in: &cancellables)
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}
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// MARK: - Public
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override func process(viewAction: SessionVerificationViewAction) async {
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switch viewAction {
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case .start:
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stateMachine.processEvent(.requestVerification)
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case .restart:
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stateMachine.processEvent(.restart)
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case .dismiss:
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callback?(.finished)
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case .cancel:
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guard stateMachine.state == .initial ||
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stateMachine.state == .verified ||
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stateMachine.state == .cancelled else {
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stateMachine.processEvent(.cancel)
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return
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}
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callback?(.finished)
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case .accept:
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stateMachine.processEvent(.acceptChallenge)
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case .decline:
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stateMachine.processEvent(.declineChallenge)
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}
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}
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// MARK: - Private
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private func setupStateMachine() {
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stateMachine.addTransitionHandler { [weak self] context in
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guard let self = self else { return }
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self.state.verificationState = context.toState
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switch (context.fromState, context.event, context.toState) {
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case (.initial, .requestVerification, .requestingVerification):
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self.requestVerification()
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case (.showingChallenge, .acceptChallenge, .acceptingChallenge):
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self.acceptChallenge()
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case (.showingChallenge, .declineChallenge, .decliningChallenge):
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self.declineChallenge()
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case (_, .cancel, .cancelling):
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self.cancelVerification()
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default:
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break
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}
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}
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stateMachine.addErrorHandler { context in
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fatalError("Failed transition with context: \(context)")
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}
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}
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private func requestVerification() {
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Task {
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switch await sessionVerificationControllerProxy.requestVerification() {
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case .success:
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// Need to wait for the callback from the remote
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break
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case .failure:
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stateMachine.processEvent(.didFail)
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}
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}
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}
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private func cancelVerification() {
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Task {
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switch await sessionVerificationControllerProxy.cancelVerification() {
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case .success:
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stateMachine.processEvent(.didCancel)
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case .failure:
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stateMachine.processEvent(.didFail)
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}
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}
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}
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private func acceptChallenge() {
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Task {
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switch await sessionVerificationControllerProxy.approveVerification() {
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case .success:
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// Need to wait for the callback from the remote
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break
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case .failure:
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stateMachine.processEvent(.didFail)
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}
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}
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}
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private func declineChallenge() {
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Task {
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switch await sessionVerificationControllerProxy.declineVerification() {
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case .success:
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stateMachine.processEvent(.didCancel)
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case .failure:
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stateMachine.processEvent(.didFail)
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}
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}
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}
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}
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