NetNewsWire/Frameworks/Articles/Attachment.swift

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

import Foundation

public struct Attachment: Hashable {

	public let attachmentID: String // Calculated
	public let url: String
	public let mimeType: String?
	public let title: String?
	public let sizeInBytes: Int?
	public let durationInSeconds: Int?
	public let hashValue: Int

	public init(attachmentID: String?, url: String, mimeType: String?, title: String?, sizeInBytes: Int?, durationInSeconds: Int?) {

		self.url = url
		self.mimeType = mimeType
		self.title = title
		if let sizeInBytes = sizeInBytes, sizeInBytes > 0 {
			self.sizeInBytes = sizeInBytes
		}
		else {
			self.sizeInBytes = nil
		}
		if let durationInSeconds = durationInSeconds, durationInSeconds > 0 {
			self.durationInSeconds = durationInSeconds
		}
		else {
			self.durationInSeconds = nil
		}

		var s = url
		s += mimeType ?? ""
		s += title ?? ""
		if let sizeInBytes = sizeInBytes {
			s += "\(sizeInBytes)"
		}
		if let durationInSeconds = durationInSeconds {
			s += "\(durationInSeconds)"
		}
		self.hashValue = s.hashValue

		if let attachmentID = attachmentID {
			self.attachmentID = attachmentID
		}
		else {
			self.attachmentID = databaseIDWithString(s)
		}
	}

	public static func ==(lhs: Attachment, rhs: Attachment) -> Bool {

		return lhs.hashValue == rhs.hashValue && lhs.attachmentID == rhs.attachmentID
	}
}