180 lines
7.4 KiB
Swift
180 lines
7.4 KiB
Swift
//
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// MPPositive_PlayerLoadViewModel.swift
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// MusicPlayer
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//
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// Created by Mr.Zhou on 2024/5/9.
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//
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import UIKit
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///播放器管理ViewModel
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class MPPositive_PlayerLoadViewModel: NSObject {
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/// 单曲常规列表
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var songVideos:[MPPositive_SongItemModel]!
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///随机播放列表
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var randomVideos:[MPPositive_SongItemModel]!
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///当前播放音乐ViewModel
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var currentVideo:MPPositive_SongViewModel!{
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willSet{
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DispatchQueue.main.asyncAfter(deadline: .now()) {
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[weak self] in
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guard let self = self else {return}
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if newValue != nil {
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MP_AnalyticsManager.shared.player_b_pvAction(newValue.song.videoId, videoname: newValue.title ?? "", artistname: newValue.song.shortBylineText ?? "")
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if currentVideo != nil {
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//当值变化时通知播放器页面，更新UI
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NotificationCenter.notificationKey.post(notificationName: .positive_player_reload, object: currentVideo)
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}else {
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//当值变化时通知播放器页面，更新UI
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NotificationCenter.notificationKey.post(notificationName: .positive_player_reload)
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}
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}
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}
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}
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}
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///单曲播放队列ViewModel
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var listViewVideos:[MPPositive_SongViewModel]!
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///异步请求组
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var group:DispatchGroup?
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///palyer管理model初始化方法
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/// - Parameters:
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/// - songs: 全部歌曲列表
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/// - firstVideoId: 需要播放的第一首歌
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init(_ songs:[MPPositive_SongItemModel], currentVideoId: String) {
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super.init()
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self.songVideos = songs
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//根据列表生成一份随机播放列表
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self.randomVideos = self.songVideos.shuffled()
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self.listViewVideos = []
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}
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///将选中Video的上1位，下两位项包括本身总计4项Video进行补全转为ViewModel,并播放这首音乐
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func improveData(_ targetVideoId:String, isRandom:Bool = false) {
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//对于选中Video的集合
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var array:[MPPositive_SongItemModel] = []
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if isRandom {
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//获取targetVideoId的索引
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guard let targetIndex = self.randomVideos.firstIndex(where: {$0.videoId == targetVideoId}) else {
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return
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}
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array.append(self.randomVideos[targetIndex])
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//获取上一位
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let previousIndex = targetIndex-1
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if previousIndex >= 0 {
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array.append(self.randomVideos[previousIndex])
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}
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let nextIndex = targetIndex+1
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let lastIndex = targetIndex+2
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if nextIndex < randomVideos.count {
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array.append(self.randomVideos[nextIndex])
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}
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if lastIndex < randomVideos.count {
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array.append(self.randomVideos[lastIndex])
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}
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}else {
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//获取targetVideoId的索引
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guard let targetIndex = self.songVideos.firstIndex(where: {$0.videoId == targetVideoId}) else {
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return
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}
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array.append(self.songVideos[targetIndex])
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//获取上一位
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let previousIndex = targetIndex-1
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if previousIndex >= 0 {
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array.append(self.songVideos[previousIndex])
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}
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let nextIndex = targetIndex+1
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let lastIndex = targetIndex+2
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if nextIndex < songVideos.count {
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array.append(self.songVideos[nextIndex])
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}
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if lastIndex < songVideos.count {
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array.append(self.songVideos[lastIndex])
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}
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}
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//获取完成，优先检索ViewModel，看看是否已存在补完video
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let videoIDs = Set(listViewVideos.map({$0.song.videoId}))
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//比较videoID,去掉已经补完的内容
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array = array.filter({!videoIDs.contains($0.videoId)})
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group = DispatchGroup()
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//去重完毕,对剩下内容补完
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for item in array {
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group?.enter()
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//补全歌词id和相关内容id
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if item.lyricsID == nil || item.relatedID == nil {
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improveDataforLycirsAndRelated(item) {[weak self] (result) in
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item.lyricsID = result.0
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item.relatedID = result.1
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self?.group?.leave()
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}
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}else {
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self.group?.leave()
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}
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group?.enter()
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//判断当前videoID是否进行过下载
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if let resource = getDocumentsFileURL(item.videoId) {
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//下载过，resource直接填入
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item.resourceUrls = [resource]
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//补全完成,转化为ViewModel，并添加进listViewVideos
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listViewVideos.append(.init(item))
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self.group?.leave()
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}else {
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//没有下载过
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//补全资源路径组和封面路径组
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improveDataforResouceAndCover(item) {[weak self] resourceUrls, coverUrls in
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if let resourceUrls = resourceUrls {
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item.resourceUrls = resourceUrls.0
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item.itags = resourceUrls.1
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item.mimeTypes = resourceUrls.2
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}
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item.coverUrls = coverUrls
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//补全完成,转化为ViewModel，并添加进listViewVideos
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self?.listViewVideos.append(.init(item))
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self?.group?.leave()
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}
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}
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}
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group?.notify(queue: .main, execute: {
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[weak self] in
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//确定播放音乐
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self?.currentVideo = self?.listViewVideos.first(where: {$0.song.videoId == targetVideoId})
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//只保留最后四首
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self?.listViewVideos = self?.listViewVideos.suffix(4)
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self?.group = nil
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})
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}
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///重新获取指定歌曲资源
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func remakeImproveData(_ completion:@escaping (() -> Void)) {
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currentVideo.configure()
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completion()
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}
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///移除选中的song，并更新listViewVideos，移除相同index的值
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func removeData(_ targetVideoId:String) {
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let targetIndex = songVideos.firstIndex(where: {$0.videoId == targetVideoId}) ?? 0
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//将选中的音乐移除，同时更新listView
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songVideos = songVideos.filter({$0.videoId != targetVideoId})
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randomVideos = randomVideos.filter({$0.videoId != targetVideoId})
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listViewVideos = listViewVideos.filter({$0.song.videoId != targetVideoId})
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if currentVideo != nil {
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//判断是否当前音乐
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if currentVideo.song.videoId == targetVideoId {
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//判断targetIndex是否大于最大音乐值
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if targetIndex < songVideos.count {
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let videoId = songVideos[targetIndex].videoId ?? ""
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improveData(videoId)
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}else {
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//移除的是原来最后一首音乐，播放新的最后一首音乐
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let videoId = songVideos.last?.videoId ?? ""
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improveData(videoId)
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}
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}
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}
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}
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//判断当前videoId是不是下载过
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private func findVideoIdForDocument(_ videoId:String) -> Bool {
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return MPPositive_DownloadItemModel.fetch(.init(format: "videoId == %@", videoId)).count != 0
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}
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}
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