MasterViewController.swift

//  Copyright © 2018 ObjectBox. All rights reserved.

import UIKit
import ObjectBox

class MasterViewController: UITableViewController {

    lazy var noteBox: Box<Note> = Services.instance.noteBox
    var noteBoxObserver: Observer?
    lazy var authorBox: Box<Author> = Services.instance.authorBox
    var authorBoxObserver: Observer?

    override func viewDidLoad() {
        super.viewDidLoad()

        clearsSelectionOnViewWillAppear = true
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        noteBoxObserver = noteBox.subscribe {
            self.tableView.reloadData()
        }
        
        authorBoxObserver = authorBox.subscribe {
            self.tableView.reloadData()
        }
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        
        noteBoxObserver = nil
        authorBoxObserver = nil
    }

    @IBAction func replaceWithDemoData(_ sender: Any?) {
        try! Services.instance.replaceWithDemoData()
        tableView.reloadData()
    }
}

// MARK: - Table View

extension MasterViewController {

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = super.tableView(tableView, cellForRowAt: indexPath)

        if indexPath.section == 0 {
            if indexPath.row == 0 {
                cell.detailTextLabel?.text = "\(try! noteBox.count())"
            } else if indexPath.row == 1 {
                cell.detailTextLabel?.text = "\(try! authorBox.count())"
            }
        }

        return cell
    }
}

// MARK: - Segues

extension MasterViewController {

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "showNotes" {
            let controller = segue.destination as! NotesOverviewViewController
            controller.filterBy(authorId: nil)
        } else if segue.identifier == "createNote" {
            let controller = (segue.destination as! UINavigationController).topViewController as! NoteEditingViewController
            controller.mode = .draft
            controller.note = Note()
        }
    }

    @IBAction func unwindFromDraftingNote(segue: UIStoryboardSegue) {
        // no op
    }
    
}