//
// Copyright 2022 New Vector Ltd
//
// 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
//
// http://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.
//

import Combine
import SwiftUI

typealias AuthenticationStartScreenViewModelType = StateStoreViewModel<AuthenticationStartScreenViewState, AuthenticationStartScreenViewAction>

class AuthenticationStartScreenViewModel: AuthenticationStartScreenViewModelType, AuthenticationStartScreenViewModelProtocol {
    private let appSettings: AppSettings
    private var actionsSubject: PassthroughSubject<AuthenticationStartScreenViewModelAction, Never> = .init()
    
    var actions: AnyPublisher<AuthenticationStartScreenViewModelAction, Never> {
        actionsSubject.eraseToAnyPublisher()
    }

    init(appSettings: AppSettings) {
        self.appSettings = appSettings
        super.init(initialViewState: AuthenticationStartScreenViewState())
        if !ProcessInfo.processInfo.isiOSAppOnMac {
            appSettings.$qrCodeLoginEnabled
                .weakAssign(to: \.state.isQRCodeLoginEnabled, on: self)
                .store(in: &cancellables)
        }
    }

    override func process(viewAction: AuthenticationStartScreenViewAction) {
        switch viewAction {
        case .loginManually:
            actionsSubject.send(.loginManually)
        case .loginWithQR:
            actionsSubject.send(.loginWithQR)
        case .reportProblem:
            actionsSubject.send(.reportProblem)
        }
    }
}