//
//  CountDownService.swift
//  HealthyZG
//
//  Created by 林 on 2020/8/11.
//  Copyright © 2020 Lin. All rights reserved.
//

import RxSwift

class CountDownService {
    
    /// 仅用来做token刷新倒计时
    static let shared = CountDownService(countDownTime: 1800)
    
    private var disposeBag = DisposeBag()
    private var time = 0
    private var countDownTime: Int
    
    var timer: DispatchSourceTimer?
    var currentTime = PublishSubject<Int>()

    init(countDownTime: Int) {
        self.countDownTime = countDownTime
        time = countDownTime
    }
    
    func cancelTimer() {
        timer?.cancel()
        timer = nil
    }
    
    func startTimer() {
        time += 1

        if timer == nil {
            let queue = DispatchQueue.global()
            timer = DispatchSource.makeTimerSource(queue: queue)
            timer?.schedule(deadline: .now(), repeating: .seconds(1))
        }
        
        timer?.setEventHandler(handler: { [weak self] in
            guard let `self` = self else { return }
            self.countDown()
        })
        timer?.resume()
    }
    
    func countDown() {
        time -= 1
        if time == 0 {
            cancelTimer()
            currentTime.onNext(time)
            time = countDownTime
        } else {
            currentTime.onNext(time)
        }
    }
}

// MARK: - Token刷新倒计时
extension CountDownService {
    func tokenRefreshCountDown() {

    }
    
    func tokenRefreshStop() {
        cancelTimer()
        time = countDownTime
    }
}