//
//  ObservableProcessTransformer.swift
//  Passepartout
//
//  Created by Davide De Rosa on 7/3/22.
//  Copyright (c) 2022 Davide De Rosa. All rights reserved.
//
//  https://github.com/passepartoutvpn
//
//  This file is part of Passepartout.
//
//  Passepartout is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  Passepartout is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with Passepartout.  If not, see <http://www.gnu.org/licenses/>.
//

import Foundation
import Combine

class ObservableProcessTransformer: ObservableObject {
    static let shared = ObservableProcessTransformer()

    private let transformer = ProcessTransformer()
    
    private var subscriptions: Set<AnyCancellable> = []
    
    private init() {
    }

    var isForeground: Bool {
        transformer.isForeground
    }
    
    func toggleForeground() {
        guard transformer.toggleForeground() else {
            return
        }
        objectWillChange.send()
    }
    
    func bringToForeground() {
        guard transformer.bringToForeground() else {
            return
        }
        objectWillChange.send()
    }

    func sendToBackground() {
        guard transformer.sendToBackground() else {
            return
        }
        objectWillChange.send()
    }

    func subscribe(_ block: @escaping () -> Void) {
        objectWillChange
            .sink(receiveValue: block)
            .store(in: &subscriptions)
    }
}