//
//  Folder.swift
//  DataModel
//
//  Created by Brent Simmons on 7/1/17.
//  Copyright © 2017 Ranchero Software, LLC. All rights reserved.
//

import Foundation
import Data

public final class Folder: DisplayNameProvider, UnreadCountProvider {

	public let accountID: String
	var childObjects = [AnyObject]()

	// MARK: - DisplayNameProvider

	public var nameForDisplay: String

	// MARK: - UnreadCountProvider

	public var unreadCount = 0 {
		didSet {
			if unreadCount != oldValue {
				postUnreadCountDidChangeNotification()
			}
		}
	}

	// MARK: - Init

	init(accountID: String, nameForDisplay: String) {
		
		self.accountID = accountID
		self.nameForDisplay = nameForDisplay
		
//		NotificationCenter.default.addObserver(self, selector: #selector(unreadCountDidChange(_:)), name: .UnreadCountDidChange, object: nil)
	}


	// MARK: Notifications
	
//	@objc dynamic public func unreadCountDidChange(_ note: Notification) {
//
//		guard let obj = note.object else {
//			return
//		}
//		let potentialChild = obj as AnyObject
//		if isChild(potentialChild) {
//			updateUnreadCount()
//		}
//	}

//	public var unreadCount = 0 {
//		didSet {
//			if unreadCount != oldValue {
//				postUnreadCountDidChangeNotification()
//			}
//		}
//	}

//	public func updateUnreadCount() {
//		
//		unreadCount = calculateUnreadCount(childObjects)
//	}
}

extension Folder: OPMLRepresentable {

	public func OPMLString(indentLevel: Int) -> String {

		let escapedTitle = nameForDisplay.rs_stringByEscapingSpecialXMLCharacters()
		var s = "<outline text=\"\(escapedTitle)\" title=\"\(escapedTitle)\">\n"
		s = s.rs_string(byPrependingNumberOfTabs: indentLevel)

		var hasAtLeastOneChild = false

		let _ = visitChildren { (oneChild) -> Bool in

			if let oneOPMLObject = oneChild as? OPMLRepresentable {
				s += oneOPMLObject.OPMLString(indentLevel: indentLevel + 1)
				hasAtLeastOneChild = true
			}
			return false
		}

		if !hasAtLeastOneChild {
			s = "<outline text=\"\(escapedTitle)\" title=\"\(escapedTitle)\"/>\n"
			s = s.rs_string(byPrependingNumberOfTabs: indentLevel)
			return s
		}

		s = s + NSString.rs_string(withNumberOfTabs: indentLevel) + "</outline>\n"

		return s
	}
}