//
//  BaseGroupTableViewController.swift
//  JiaPeiManage
//
//  Created by Ning.ge on 2023/6/21.
//

import UIKit

import RxSwift
import EmptyKit

class BaseGroupTableViewController: BaseViewController,Refreshable {
    
    var isEmptyDisplay: Bool = true
    var isNotData:Bool = false
    var visibleIndexPath: IndexPath?
    let tableView: UITableView = UITableView(frame: CGRectZero, style: .grouped).then{
        $0.backgroundColor = .db_theme
        $0.showsVerticalScrollIndicator = false
        $0.tableFooterView = UIView()
    }
    
    override func setupConstraints() {
        tableView.snp.makeConstraints { (make) in
            make.edges.equalTo(0)
        }
    }
    
    
    override func viewDidLoad() {
        if isNotData {
            emptyView.loading_imageview.image = UIImage(named: "animation_loading_error_2")
            emptyView.loading_label.text = "暂无数据"
        }
        super.viewDidLoad()
        tableView.ept.dataSource = self
        tableView.ept.delegate = self
        
        view.addSubview(tableView)
        
        showLoadAnimation()
        
        registerNetErrorNotification()
        
    }
    
    //MARK: Public Method
    //防止异常滚动
    func reloadDataWithPreserveScrollPosition() {
        // 记录当前可见的 section 和 row
        if let indexPaths = tableView.indexPathsForVisibleRows,
           let firstIndexPath = indexPaths.first {
            visibleIndexPath = firstIndexPath
        }
        
        // 调用 reloadData()
        tableView.reloadData()
        
        // 手动滚动到之前记录的 section 和 row
        if let indexPath = visibleIndexPath {
            tableView.scrollToRow(at: indexPath, at: .top, animated: false)
        }
    }

    
    func startRefresh() {
        
        self.tableView.setContentOffset(.zero, animated: true)
        DispatchQueue.delay(time: 0.3, action: {
            self.tableView.es.startPullToRefresh()
        })
    }
    
    func registerNetErrorNotification() {
        
        NotificationCenter.default.rx.notification(custom: .netError)
            .subscribe(onNext: {[unowned self] (_) in
                
                self.stopRefresh()
                
                self.showNetErrorView()
                
            })
            .disposed(by: disposeBag)
    }
    
    
    func showNetErrorView() {
        
        if totalItems() > 0 { return }
        
        self.showAnimationView(self.tableView, animationType: .failure)
    }
    
    func showLoadAnimation() {
        self.showAnimationView(self.tableView)
    }
    
    func hideLoadAnimation() {
        self.hideAnimationView(self.tableView)
    }
    
    func stopRefresh() {
        
        guard let isRefreshing = tableView.header?.isRefreshing else { return }
        
        if isRefreshing {
            tableView.es.stopPullToRefresh()
        }
    }
    
    //MARK: Private Method
    func stopLoad() {
        
        guard let isLoading = tableView.footer?.isRefreshing else { return }
        
        if isLoading {
            tableView.es.stopLoadingMore()
        }
    }
}

//MARK: Notification
extension BaseGroupTableViewController {
    
    func totalItems() -> Int {
        
        var totalItems: Int = 0
        
        let sectionCount = self.tableView.numberOfSections
        
        for i in 0 ..< sectionCount {
            
            let items = self.tableView.numberOfRows(inSection: i)
            
            totalItems += items
        }
        
        return totalItems
    }
}

extension BaseGroupTableViewController:EmptyDelegate,EmptyDataSource {
    
    func customViewForEmpty(in view: UIView) -> UIView? {
        
        return EmptyView.loadFromNib()
    }
    
    func emptyShouldAllowScroll(in view: UIView) -> Bool {
        return true
    }
    
    func emptyShouldDisplay(in view: UIView) -> Bool {
        return isEmptyDisplay
    }
}