//
//  HotQuoteViewController.swift
//  MTP2_iOS
//
//  Created by Handy_Cao on 2020/10/30.
//  Copyright © 2020 Muchinfo. All rights reserved.
//

import UIKit
import WHToast
import SwiftyAttributes
import GTMRefresh

/// 热卖商品视图容器控制类
class HotQuoteViewController: BaseViewController {
    
    // MARK: - 属性列表
    /// 位置按钮
    @IBOutlet weak var location: UIButton!
    /// 商品数据集合视图
    @IBOutlet weak var collectionView: UICollectionView! {
        didSet {
            if collectionView.responds(to: #selector(setter: UICollectionView.isPrefetchingEnabled)) {
                collectionView.isPrefetchingEnabled = false
            }
            /// 设置约束
            collectionView.setCollectionViewLayout(flowLayout, animated: true)
        }
    }
    /// 数据显示集合视图约束
    lazy var flowLayout: UICollectionViewFlowLayout = {
        /// 最小行间距，默认是0
        $0.minimumLineSpacing = 0
        /// 最小左右间距，默认是10
        $0.minimumInteritemSpacing = 0
        /// 区域内间距，默认是 UIEdgeInsetsMake(0, 0, 0, 0)
        $0.sectionInset = UIEdgeInsets(top: 0.0, left: 0, bottom: 0, right: 0)
        /// 水平滚动
        $0.scrollDirection = .vertical
        return $0
    } (UICollectionViewFlowLayout())
    
    /// GoodsCellIdentifier
    let GoodsCellIdentifier = "Goods_Cell"
    /// 商品数据信息
    var goods: [MoGoodsInfo] = [] {
        didSet {
            /// 刷新数据
            collectionView.reloadData()
            /// 是否隐藏按钮
            self.noDataButton.isHidden = goods.count != 0
            if goods.count > 0 {
                /// 等待UI操作完成，也就是tableView刷新完之后执行
                DispatchQueue.main.async { [weak self] in
                    if self?.visibleGoodsCodes.count != 0 { self?.shouldSubscriptGoodsCodes = self?.visibleGoodsCodes }
                }
            }
        }
    }
    /// 省份信息
    var geographics: [MoGeographicPosition] = []
    /// 市区信息
    var city: MoGeographic? {
        didSet {
            self.location.setTitle(city?.pathname ?? "全部", for: .normal)
            /// 查询商品
            self.requestQueryHotGoods(self.city)
        }
    }

    // MARK: - 生命周期
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        /// UI界面初始化
        buildView()
    }
    
    override func didMove(toParent parent: UIViewController?) {
        super.didMove(toParent: parent)
        
        if let _ = parent {
            /// 数据初始化
            initData()
        } else {
            noDataButton.isHidden = true
        }
        
        /// 侦听行情推送广播
        MTP2BusinessCore.shared.broadcastManager?.addBroadcastListener(owner: self, action: .ReceiveTradeQuote) { [weak self] in
            guard let quoteGoodsInfos = $0.object as? [(goodsHqCode: String, exchHqCode: String)],
                let weakSelf = self else { return }
            
            /// 有数据
            if quoteGoodsInfos.count != 0 {
                /// 待刷新行
                var refreshIndexPaths = [IndexPath]()
                DispatchQueue.main.async {
                    for (index, cell) in weakSelf.collectionView.visibleCells.enumerated() {
                        if quoteGoodsInfos.first(where: { $0.goodsHqCode == (cell as? GoodsCell)?.model?.goodscode }) != nil {
                            let indexPath = IndexPath(row: index, section: 0)
                            if refreshIndexPaths.firstIndex(of: indexPath) == nil {
                                /// 记录待刷新行
                                /// 判断是否在可见区域
                                if weakSelf.collectionView.indexPathsForVisibleItems.firstIndex(of: indexPath) != nil {
                                    refreshIndexPaths.append(indexPath)
                                }
                            }
                        }
                    }
                }
                
                /// 刷新行情列表
                if refreshIndexPaths.count > 0 {
                    DispatchQueue.main.async {
                        weakSelf.collectionView.reloadItems(at: refreshIndexPaths)
                    }
                }
            }
        }
    }
    
    deinit {
        /// 清除广播侦听
        MTP2BusinessCore.shared.broadcastManager?.removeBroadcastListener(owner: self, forName: .ReceiveTradeQuote)
    }
    
    // MARK: - 数据初始化
    /// 数据初始化
    fileprivate func initData() {
        /// 查询热门商品信息
        requestQueryHotGoods(self.city)
    }
    
    /// UI界面初始化
    fileprivate func buildView() {
        /// 异常
        guard let accountManager = MTP2BusinessCore.shared.accountManager else {
            return
        }
        /// loding......
        addLoadingView()
        /// 赋值省市区信息
        self.geographics = accountManager.geographics ?? []
        /// 添加下拉刷新控件
        self.collectionView.gtm_addRefreshHeaderView(refreshHeader: DefaultGTMRefreshHeader()) {
            /// 重置请求条件
            self.initData()
        }
    }
    
    // MARK: - 接口请求    
    /// 获取热门商品数据信息
    fileprivate func requestQueryHotGoods(_ city: MoGeographic?) {
        /// 异常
        guard let goodsManager = MTP2BusinessCore.shared.goodsManager else {
            return
        }
        /// 目标省份
        let descProvinceID = (city == nil || city?.divisionlevel != "province") ? nil : city?.autoid
        /// 目标城市
        let descCityID = (city == nil || city?.divisionlevel != "city") ? nil : city?.autoid
        /// startAnimating
        self._anim?.startAnimating()
        
        /// 发送请求
        goodsManager.requestQueryTopGoods(goodsManager.getMarketIDs(.TRADEMODE_LISTING_SELECT), descProvinceID, descCityID) { (isComplete, error, topGoods) in
            DispatchQueue.main.async {
                /// stopAnimating
                self._anim?.stopAnimating()
                /// endRefreshing
                self.collectionView.endRefreshing()
                if isComplete {
                    /// 数据获取成功
                    self.goods = topGoods ?? []
                } else {
                    self.goods = []
                    /// toast
                    WHToast.showError(withMessage: "数据获取失败，原因：\(error?.retMsg ?? "未知错误")", duration: 1.0, finishHandler: {})
                }
            }
        }
    }
    
    // MARK: - 交互相关
    /// onButtonPressed
    /// - Parameter sender: sender
    @IBAction fileprivate func onButtonPressed(_ sender: UIButton) {
        switch sender {
        case location: /// 位置
            let geographicPickView = GeographicPickView(nibName: "GeographicPickView", bundle: nil)
            geographicPickView.modalTransitionStyle = .coverVertical
            geographicPickView.modalPresentationStyle = .overFullScreen
            geographicPickView.callback = { (_ takeInfo: MoGeographic?, _ isSure: Bool) in
                self.city = takeInfo
            }
            self.present(geographicPickView, animated: true, completion: {})
        default:
            break
        }
    }
    
    // MARK: - 订阅行情相关
    var uuid: String = UUID().uuidString
    
    var shouldSubscriptGoodsCodes: Set<String>? {
        didSet {
            guard let quoteSubscriptManager = MTP2BusinessCore.shared.quoteSubscriptManager else { return }
            quoteSubscriptManager.updateQuoteSubcriptGoods(uuid: uuid, goodsCode: shouldSubscriptGoodsCodes ?? [])
        }
    }
    
    var visibleGoodsCodes: Set<String> {
        var goodsCodes = Set<String>()
        self.collectionView.visibleCells.forEach { (cell) in
            if let quoteCell = cell as? GoodsCell, let goodsCode = quoteCell.model?.goodscode {
                goodsCodes.insert(goodsCode)
            }
        }
        return goodsCodes
    }
    
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
        if segue.identifier == "ShowGoodsDetail" {
            /// 商品详情
            (segue.destination as? GoodsDetailViewController)?.model = (sender as? GoodsCell)?.model
        }
    }

}

// MARK: - UIScrollViewDelegate
extension HotQuoteViewController: UIScrollViewDelegate {
    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        if visibleGoodsCodes.count != 0 { shouldSubscriptGoodsCodes = visibleGoodsCodes }
    }
}

// MARK: - UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout
extension HotQuoteViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return self.goods.count
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: GoodsCellIdentifier, for: indexPath) as! GoodsCell
        cell.model = self.goods[indexPath.item]
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: collectionView.width/2, height: ((collectionView.width/2)*0.9)+80.0)
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
     
    }
}