MasterViewController.swift

//
//  MasterViewController.swift
//  swift01
//
//  Created by  on 2020/8/18.
//  Copyright © 2020 admin. All rights reserved.
//

import UIKit

class MasterViewController: UITableViewController {
    let dataSource = MainTableViewDataSource()
    
    var detailViewController: DetailViewController? = nil
    var objects = [Any]()


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        navigationItem.leftBarButtonItem = editButtonItem

        setupNotificationObservers()
        
        let addButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(insertNewObject(_:)))
        navigationItem.rightBarButtonItem = addButton
        if let split = splitViewController {
            let controllers = split.viewControllers
            detailViewController = (controllers[controllers.count-1] as! UINavigationController).topViewController as? DetailViewController
        }
    }

    override func viewWillAppear(_ animated: Bool) {
        clearsSelectionOnViewWillAppear = splitViewController!.isCollapsed
        super.viewWillAppear(animated)
    }

    @objc
    func insertNewObject(_ sender: Any) {
        objects.insert(NSDate(), at: 0)
        let indexPath = IndexPath(row: 0, section: 0)
        tableView.insertRows(at: [indexPath], with: .automatic)
    }

    // MARK: - Segues

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "showDetail" {
            if let indexPath = tableView.indexPathForSelectedRow {
//                let object = objects[indexPath.row] as! NSDate
                let object = dreams[indexPath.row] 
                let controller = (segue.destination as! UINavigationController).topViewController as! DetailViewController
                controller.detailItem = object
                controller.navigationItem.leftBarButtonItem = splitViewController?.displayModeButtonItem
                controller.navigationItem.leftItemsSupplementBackButton = true
                detailViewController = controller
            }
        }
    }

    // MARK: - Table View

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//        return objects.count
        return dreams.count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
//        let object = objects[indexPath.row] as! NSDate
//        cell.textLabel!.text = object.description
        let dream: Dream
        dream = dreams[indexPath.row]
        cell.textLabel!.text = dream.description
        
        return cell
    }

    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        // Return false if you do not want the specified item to be editable.
        return true
    }

    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            objects.remove(at: indexPath.row)
            tableView.deleteRows(at: [indexPath], with: .fade)
        } else if editingStyle == .insert {
            // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
        }
    }


}

extension MasterViewController {
    fileprivate func setupNotificationObservers() {
        NotificationCenter.default.addObserver(self, selector: #selector(reloadTableView(_:)), name: .dataRetrieved, object: nil)
    }
    
    fileprivate func removeNotificationObserver() {
        NotificationCenter.default.removeObserver(self, name: .dataRetrieved, object: nil)
    }
    
    @objc fileprivate func reloadTableView(_ notification: Notification) {
        DispatchQueue.main.async { [unowned self] in
            
            print("====",self.dreams)
            self.tableView.reloadData()
        }
    }
    
    var dreams : [Dream] {
        return ApplicationData.DatabaseData.read()
    }
}