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

import Foundation

// Threading rules:
// * Main-thread only
// * Except: may be created on background thread by StatusesTable.
// Which is safe, because at creation time it’t not yet shared,
// and it won’t be mutated ever on a background thread.

public final class ArticleStatus: Hashable {
	
	public enum Key: String {
		case read = "read"
		case starred = "starred"
	}
	
	public let articleID: String
	public let dateArrived: Date

	public var read = false
	public var starred = false

	public init(articleID: String, read: Bool, starred: Bool, dateArrived: Date) {
		self.articleID = articleID
		self.read = read
		self.starred = starred
		self.dateArrived = dateArrived
	}

	public convenience init(articleID: String, read: Bool, dateArrived: Date) {
		self.init(articleID: articleID, read: read, starred: false, dateArrived: dateArrived)
	}

	public func boolStatus(forKey key: ArticleStatus.Key) -> Bool {
		switch key {
		case .read:
			return read
		case .starred:
			return starred
		}
	}
	
	public func setBoolStatus(_ status: Bool, forKey key: ArticleStatus.Key) {
		switch key {
		case .read:
			read = status
		case .starred:
			starred = status
		}
	}

	// MARK: - Hashable

	public func hash(into hasher: inout Hasher) {
		hasher.combine(articleID)
	}

	// MARK: - Equatable

	public static func ==(lhs: ArticleStatus, rhs: ArticleStatus) -> Bool {
		return lhs.articleID == rhs.articleID && lhs.dateArrived == rhs.dateArrived && lhs.read == rhs.read && lhs.starred == rhs.starred
	}
}

public extension Set where Element == ArticleStatus {
	
	func articleIDs() -> Set<String> {
		return Set<String>(map { $0.articleID })
	}
}

public extension Array where Element == ArticleStatus {
	
	func articleIDs() -> [String] {		
		return map { $0.articleID }
	}
}