//
//  PQPhotoAlbumController.swift
//  PQSpeed
//
//  Created by SanW on 2020/8/31.
//  Copyright © 2020 BytesFlow. All rights reserved.
//

import Photos
import UIKit
/// 相册集
open class PQPhotoAlbumController: PQBaseViewController {
    public  var selectedHandle: ((_ selectedData: PQUploadModel?) -> Void)? // 选中/取消选中的回调
    public var isTopShow: Bool = false // 是否显示在顶部

    public var categoryH: CGFloat = cDefaultMargin * 26  // 相簿高度
    public var albaumsData: [PQUploadModel] = Array<PQUploadModel>.init()
    public let itemSize = CGSize(width: ((cScreenWidth - cDefaultMargin) / 3) * UIScreen.main.scale, height: ((cScreenWidth - cDefaultMargin) / 3) * UIScreen.main.scale)
    var catagerySelectedIndex: IndexPath = IndexPath(item: 0, section: 0) // 更多图库选择
    lazy  public var imageManager: PHCachingImageManager = {
        PHCachingImageManager()
    }()

    lazy public  var albaumCollectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        layout.sectionInset = UIEdgeInsets.zero
        layout.itemSize = CGSize(width: view.frame.width, height: cDefaultMargin * 8 )
        layout.minimumLineSpacing = 0
        layout.minimumInteritemSpacing = 0
        let albaumCollectionView = UICollectionView(frame: CGRect(x: 0, y: isTopShow ? 0 : (albaumView.frame.height - categoryH), width: albaumView.frame.width, height: isTopShow ? 0 : categoryH - 300), collectionViewLayout: layout)
        albaumCollectionView.showsVerticalScrollIndicator = false
        albaumCollectionView.register(PQAssetCategoryCell.self, forCellWithReuseIdentifier: "PQAssetCategoryCell")
        albaumCollectionView.delegate = self
        albaumCollectionView.dataSource = self
        if #available(iOS 11.0, *) {
            albaumCollectionView.contentInsetAdjustmentBehavior = .never
        } else {
            automaticallyAdjustsScrollViewInsets = false
        }
        albaumCollectionView.backgroundColor = UIColor.white
        return albaumCollectionView
    }()

    lazy  public var emptyRemindView: PQEmptyRemindView = {
        let remindView = PQEmptyRemindView(frame: albaumCollectionView.bounds)
        remindView.isHidden = true
        albaumCollectionView.addSubview(remindView)
        remindView.backgroundColor = PQBFConfig.shared.styleBackGroundColor
        remindView.fullRefreshBloc = { [weak self] _, _ in
            if self?.emptyRemindView.refreshBtn.currentTitle == "授予权限" {
                openAppSetting()
            } else if self?.emptyRemindView.refreshBtn.currentTitle == "刷新" {
                self?.albaumsData.removeAll()
                self?.loadPhotoData()
            }
        }
        remindView.remindLab.textColor = UIColor.hexColor(hexadecimal: "#999999")
        remindView.refreshBtn.setTitle("授予权限", for: .normal)
        let anthorEmptyData = PQEmptyModel()
        anthorEmptyData.title = "挑选相册素材"
        anthorEmptyData.summary = "要挑选相册素材，请先授予相册使用权限"
        anthorEmptyData.emptyImage = "icon_authorError"
        anthorEmptyData.isRefreshHidden = false
        anthorEmptyData.refreshBgColor = UIColor.hexColor(hexadecimal: PQBFConfig.shared.styleColor.rawValue)
        remindView.emptyData = anthorEmptyData
        return remindView
    }()

    lazy  public var albaumView: UIView = {
        let albaumView = UIView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height))
        let ges = UITapGestureRecognizer(target: self, action: #selector(gesTagClick))
        albaumView.addGestureRecognizer(ges)
        return albaumView
    }()

    open override func viewDidLoad() {
        super.viewDidLoad()
        
        // Do any additional setup after loading the view.
        view.backgroundColor = UIColor.init(red: 0, green: 0, blue: 0, alpha: 0.7)
        hiddenNavigation()
        loadPhotoData()
    }

    open override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        PHPhotoLibrary.shared().register(self)
    }

    open override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        PHPhotoLibrary.shared().unregisterChangeObserver(self)
    }
}

extension PQPhotoAlbumController {
    /// 修改view frame
    /// - Parameter frame: <#frame description#>
    /// - Returns: <#description#>
    public func updateViewFrame(frame: CGRect) {
        view.frame = frame
        view.isHidden = true
        view.addSubview(albaumView)
        view.addSubview(albaumCollectionView)
    }

    func loadPhotoData() {
        DispatchQueue.global().async { [weak self] in
            let allPhotos = PHAsset.fetchAssets(with: creaFetchOptions)
            if allPhotos.count > 0 {
                let tempData = PQUploadModel()
                tempData.title = "全部"
                tempData.categoryList = allPhotos
                self?.albaumsData.insert(tempData, at: 0)
                self?.updateItems(indexPath: IndexPath(item: 0, section: 0))
            }
            DispatchQueue.main.async { [weak self] in
                self?.emptyRemindView.isHidden = allPhotos.count > 0
            }
            let smartAlbums = PHAssetCollection.fetchAssetCollections(with: .smartAlbum, subtype: .albumRegular, options: nil)
            smartAlbums.enumerateObjects { [weak self] assCollection, _, _ in
                if assCollection.localizedTitle != "最近删除" {
                    self?.convertCollection(collection: assCollection)
                }
            }
            let userCollections = PHCollectionList.fetchTopLevelUserCollections(with: nil)
            userCollections.enumerateObjects { [weak self] assCollection, index, point in
                BFLog(message: "userCollections == \(assCollection),index = \(index),point = \(point)")
                if assCollection is PHAssetCollection {
                    if assCollection.localizedTitle != "最近删除" {
                        self?.convertCollection(collection: assCollection as? PHAssetCollection)
                    }
                }
            }
        }
    }

    // 转化处理获取到的相簿
   public func convertCollection(collection: PHAssetCollection?) {
        if collection == nil {
            return
        }
        DispatchQueue.global().async { [weak self] in
            var options: PHFetchOptions = creaFetchOptions
            if collection?.localizedTitle == "最近项目" || collection?.localizedTitle == "最近添加" {
                options = modiFetchOptions
            }
            let assetsFetchResult = PHAsset.fetchAssets(in: collection!, options: options)
            if assetsFetchResult.count > 0 {
                let tempData = PQUploadModel()
                tempData.assetCollection = collection
                tempData.title = collection?.localizedTitle
                tempData.categoryList = assetsFetchResult
                if tempData.categoryList.count > 0 {
                    if tempData.title == "视频" {
                        self?.albaumsData.insert(tempData, at: 1)
                        self?.updateItems(indexPath: IndexPath(item: 1, section: 0))
                    } else {
                        self?.albaumsData.append(tempData)
                        self?.updateItems(indexPath: IndexPath(item: (self?.albaumsData.count ?? 1) - 1, section: 0))
                    }
                }
                BFLog(message: "assetsFetchResult = \(assetsFetchResult)")
            }
        }
    }

    /// 更新数据源
    /// - Parameter indexPath: <#indexPath description#>
    /// - Returns: <#description#>
    public  func updateItems(indexPath _: IndexPath) {
        DispatchQueue.main.async { [weak self] in
            self?.albaumCollectionView.reloadData()
//            UIView.performWithoutAnimation {[weak self] in
//                self?.albaumCollectionView.performBatchUpdates({
//                    self?.albaumCollectionView.insertItems(at: [indexPath])
//                }) {(isSuccess) in
//
//                }
//            }
        }
    }

    /// 点击隐藏view
    /// - Returns: <#description#>
    @objc  public  func gesTagClick() {
        if selectedHandle != nil {
            selectedHandle!(nil)
        }
        albaumCollectionView.reloadData()
        dismissCategoryView()
    }

    @objc  public func dismissCategoryView() {
        if isTopShow {
            UIView.animate(withDuration: 0.3, animations: {
                self.albaumCollectionView.frame = CGRect(x: 0, y: 0, width: cScreenWidth, height: 0)
                self.albaumView.alpha = 0
            }) { _ in
                self.albaumView.isHidden = true
                self.view.isHidden = true
            }
        } else {
            albaumCollectionView.dismissViewAnimate { [weak self] _ in
                self?.view.isHidden = true
            }
        }
    }

    @objc  public func showCategoryView() {
        if isTopShow {
            view.isHidden = false
            albaumView.isHidden = false
            albaumView.alpha = 0
//            view.bringSubviewToFront(albaumView)
            UIView.animate(withDuration: 0.3, animations: {
                self.albaumCollectionView.frame = CGRect(x: 0, y: 0, width: cScreenWidth, height: self.categoryH)
                self.albaumView.alpha = 1
            }) { _ in
            }
            albaumCollectionView.reloadData()
        } else {
            view.isHidden = false
            albaumCollectionView.showViewAnimate()
        }
    }
}

extension PQPhotoAlbumController: UICollectionViewDelegate, UICollectionViewDataSource, UIScrollViewDelegate {
    public func collectionView(_: UICollectionView, numberOfItemsInSection _: Int) -> Int {
        return albaumsData.count
    }

    public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = PQAssetCategoryCell.assetCategoryCell(collectionView: collectionView, indexPath: indexPath)
        let itemData = albaumsData[indexPath.item]
        let asset = itemData.categoryList.object(at: 0)
        cell.representedAssetIdentifier = asset.localIdentifier
        if itemData.image == nil {
            imageManager.requestImage(for: asset, targetSize: itemSize, contentMode: .aspectFill, options: nil) { image, info in
                if info?.keys.contains("PHImageResultIsDegradedKey") ?? false, "\(info?["PHImageResultIsDegradedKey"] ?? "0")" == "0", cell.representedAssetIdentifier == asset.localIdentifier {
                    itemData.image = image
                    cell.uploadData = itemData
                }
            }
        } else {
            cell.uploadData = itemData
        }
        cell.isSelected = indexPath == catagerySelectedIndex
        return cell
    }

    public func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        if selectedHandle != nil {
            selectedHandle!(albaumsData[indexPath.item])
        }
        catagerySelectedIndex = indexPath
        collectionView.reloadData()
        dismissCategoryView()
    }

    public func scrollViewDidScroll(_ scrollView: UIScrollView) {
        if (!isTopShow && (scrollView.contentOffset.y < -cDefaultMargin * 7)) || (isTopShow && scrollView.contentOffset.y > ((scrollView.contentSize.height - scrollView.frame.height) + cDefaultMargin * 10)) {
            if selectedHandle != nil {
                selectedHandle!(nil)
            }
            dismissCategoryView()
        }
    }
}

extension PQPhotoAlbumController: PHPhotoLibraryChangeObserver {
    public func photoLibraryDidChange(_: PHChange) {
        DispatchQueue.main.sync {
            // Check each of the three top-level fetches for changes.
            albaumsData.removeAll()
            loadPhotoData()
        }
    }
}