//
//  AudioContainerViewModel.swift
//  Mastodon
//
//  Created by sxiaojian on 2021/3/9.
//

import CoreDataStack
import Foundation
import UIKit

class AudioContainerViewModel {
    
//    static func configure(
//        cell: StatusCell,
//        audioAttachment: Attachment,
//        audioService: AudioPlaybackService
//    ) {
//        guard let duration = audioAttachment.meta?.original?.duration else { return }
//        let audioView = cell.statusView.audioView
//        audioView.timeLabel.text = duration.asString(style: .positional)
//
//        audioView.playButton.publisher(for: .touchUpInside)
//            .sink { [weak audioService] _ in
//                guard let audioService = audioService else { return }
//                if audioAttachment === audioService.attachment {
//                    if audioService.isPlaying() {
//                        audioService.pause()
//                    } else {
//                        audioService.resume()
//                    }
//                    if audioService.currentTimeSubject.value == 0 {
//                        audioService.playAudio(audioAttachment: audioAttachment)
//                    }
//                } else {
//                    audioService.playAudio(audioAttachment: audioAttachment)
//                }
//            }
//            .store(in: &cell.disposeBag)
//        audioView.slider.maximumValue = Float(duration)
//        audioView.slider.publisher(for: .valueChanged)
//            .sink { [weak audioService] slider in
//                guard let audioService = audioService else { return }
//                let slider = slider as! UISlider
//                let time = TimeInterval(slider.value)
//                audioService.seekToTime(time: time)
//            }
//            .store(in: &cell.disposeBag)
//        observePlayer(cell: cell, audioAttachment: audioAttachment, audioService: audioService)
//        if audioAttachment != audioService.attachment {
//            configureAudioView(audioView: audioView, audioAttachment: audioAttachment, playbackState: .stopped)
//        }
//    }
//
//    static func observePlayer(
//        cell: StatusCell,
//        audioAttachment: Attachment,
//        audioService: AudioPlaybackService
//    ) {
//        let audioView = cell.statusView.audioView
//        var lastCurrentTimeSubject: TimeInterval?
//        audioService.currentTimeSubject
//            .throttle(for: 0.008, scheduler: DispatchQueue.main, latest: true)
//            .compactMap { [weak audioService] time -> TimeInterval? in
//                defer {
//                    lastCurrentTimeSubject = time
//                }
//                guard audioAttachment === audioService?.attachment else { return nil }
//                // guard let duration = audioAttachment.meta?.original?.duration else { return nil }
//
//                if let lastCurrentTimeSubject = lastCurrentTimeSubject, time != 0.0 {
//                    guard abs(time - lastCurrentTimeSubject) < 0.5 else { return nil } // debounce
//                }
//
//                guard !audioView.slider.isTracking else { return nil }
//                return TimeInterval(time)
//            }
//            .sink(receiveValue: { time in
//                audioView.timeLabel.text = time.asString(style: .positional)
//                audioView.slider.setValue(Float(time), animated: true)
//            })
//            .store(in: &cell.disposeBag)
//        audioService.playbackState
//            .receive(on: DispatchQueue.main)
//            .sink(receiveValue: { playbackState in
//                if audioAttachment === audioService.attachment {
//                    configureAudioView(audioView: audioView, audioAttachment: audioAttachment, playbackState: playbackState)
//                } else {
//                    configureAudioView(audioView: audioView, audioAttachment: audioAttachment, playbackState: .stopped)
//                }
//            })
//            .store(in: &cell.disposeBag)
//    }

    static func configureAudioView(
        audioView: AudioContainerView,
        audioAttachment: MastodonAttachment,
        playbackState: PlaybackState
    ) {
        fatalError()
//        switch playbackState {
//        case .stopped:
//            audioView.playButton.isSelected = false
//            audioView.slider.isUserInteractionEnabled = false
//            audioView.slider.setValue(0, animated: false)
//        case .paused:
//            audioView.playButton.isSelected = false
//            audioView.slider.isUserInteractionEnabled = true
//        case .playing, .readyToPlay:
//            audioView.playButton.isSelected = true
//            audioView.slider.isUserInteractionEnabled = true
//        default:
//            assertionFailure()
//        }
//        guard let duration = audioAttachment.meta?.original?.duration else { return }
//        audioView.timeLabel.text = duration.asString(style: .positional)
    }
}