Music_Player3/relax.offline.mp3.music/MP/MPPositive/Models/ViewModels/LoadViewModels/MPPositive_BrowseLoadViewModel.swift

//
//  MPPositive_LoadMusicModel.swift
//  MusicPlayer
//
//  Created by Mr.Zhou on 2024/4/25.
//

import UIKit
///b面音乐数据管理load
class MPPositive_BrowseLoadViewModel: NSObject {
    static let shared = MPPositive_BrowseLoadViewModel()
    ///预览模块数据组(通过网络请求刷新)
    var browseModuleLists:[MPPositive_BrowseModuleListViewModel] = []
    //是否发起过埋点
    private var isAction:Bool = false
    override init() {
        super.init()
        //当网络请求工具触发browse请求闭包时
        MP_NetWorkManager.shared.browseRequestStateBlock = {
            [weak self] (lists,isCompleted) in
            guard let self = self else {return}
            if isAction == false {
                if (lists.first?.items.count ?? 0) != 0 {
                    print("B面预览数据成功拉取")
                    //加载完毕后
                    MP_AnalyticsManager.shared.home_b_module_showsucces_actionAction()
                }else {
                    print("B面预览数据拉取失败")
                    //没有数据
                    MP_AnalyticsManager.shared.home_b_module_showfailure_errorAction("No Datas")
                }
                isAction = true
            }
            DispatchQueue.main.async {
                [weak self] in
                guard let self = self else {return}
                //配置预览模块数据
                browseModuleLists.append(contentsOf: lists)
                //移除为空的数据
                browseModuleLists = browseModuleLists.filter{($0.items.count != 0)}
                //通知首页刷新UI
                NotificationCenter.notificationKey.post(notificationName: .positive_browses_reload)
            }
            if isCompleted == true {
                //将视频移动到最后
                DispatchQueue.main.async{
                    [weak self] in
                    guard let self = self else {
                        return
                    }
                    //查找目标院所索引
                    if let index = browseModuleLists.firstIndex(where: {$0.items.first?.browseItem.pageType == "MUSIC_PAGE_TYPE_ARTIST"}) {
                        // 移除目标元素
                        let removedElement = browseModuleLists.remove(at: index)
                        //添加到第二位
                        browseModuleLists.insert(removedElement, at: 1)
                    }
                    // 查找目标元素的索引
                    if let index = browseModuleLists.firstIndex(where: {$0.items.first?.browseItem.pageType == "MUSIC_VIDEO_TYPE_OMV"}) {
                        // 移除目标元素
                        let removedElement = browseModuleLists.remove(at: index)
                        // 将目标元素添加到数组的最后
                        browseModuleLists.append(removedElement)
                    }
                    NotificationCenter.notificationKey.post(notificationName: .positive_browses_reload)
                    //将加载完毕的数据移入缓存
                    if browseModuleLists.count != 0 {
                        cacheResponseData(browseModuleLists)
                    }
                }
            }
        }
        //当网络请求工具触发error闭包时
        MP_NetWorkManager.shared.browseRequestErrorBlock = {
            [weak self] in
            guard let self = self else {return}
            //当前因为某原因导致网络请求数据失败，现在从缓存中获取数据
            guard let array = chachedData() else {
                //并没有缓存数据
                NotificationCenter.notificationKey.post(notificationName: .netWork_error_deal)
                return
            }
            //有缓存数据
            browseModuleLists = array
            //通知首页刷新UI
            NotificationCenter.notificationKey.post(notificationName: .positive_browses_reload)
        }
    }
    ///刷新预览数据
    func reloadBrowseLists() {
        //清空预览模块数据
        browseModuleLists.removeAll()
        //调用网络请求工具的预览请求
        MP_NetWorkManager.shared.requestBrowseDatas()
        //同步更新gride
        MPPositive_GridLoadViewModel.shared.reloadGrides()
    }
    ///缓存预览数据
    private func cacheResponseData(_ array: [MPPositive_BrowseModuleListViewModel]) {
        guard browseModuleLists.count != 0 else {
            print("Home Browse数据未加载，无法缓存")
            return
        }
        //将数据转为jsonData
        do{
            let jsonData = try JSONEncoder().encode(array)
            //使用UserDefaults存入缓存数据
            UserDefaults.standard.set(jsonData, forKey: "HomeBrowse")
            print("已经将Home Browse数据缓存")
        }catch{
            //转为jsonData失败
            print("Home Browse数据转为Data失败，失败原因\(error)")
        }
    }
    //读取预览数据
    private func chachedData() -> [MPPositive_BrowseModuleListViewModel]? {
        guard let cacheData = UserDefaults.standard.data(forKey: "HomeBrowse") else {
            print("获取Home Browse缓存数据失败")
            return nil
        }
        //将cacheData转为[MPPositive_BrowseModuleListViewModel]
        do {
            let array:[MPPositive_BrowseModuleListViewModel] = try JSONDecoder().decode([MPPositive_BrowseModuleListViewModel].self, from: cacheData)
            print("已经将Home Browse缓存数据取出")
            return array
        } catch {
            //转为jsonData失败
            print("获取Home Browse缓存数据失败，失败原因\(error)")
            return nil
        }
    }
}