//
//  ArticleFetcherType.swift
//  Account
//
//  Created by Maurice Parker on 11/13/19.
//  Copyright © 2019 Ranchero Software, LLC. All rights reserved.
//

import Foundation
import Account

protocol SidebarItemIdentifiable {
	@MainActor var sidebarItemID: SidebarItemIdentifier? { get }
}

enum SidebarItemIdentifier: CustomStringConvertible, Hashable, Equatable {
	
	case smartFeed(String) // String is a unique identifier
	case script(String) // String is a unique identifier
	case feed(String, String) // accountID, feedID
	case folder(String, String) // accountID, folderName
	
	var description: String {
		switch self {
		case .smartFeed(let id):
			return "smartFeed: \(id)"
		case .script(let id):
			return "script: \(id)"
		case .feed(let accountID, let feedID):
			return "feed: \(accountID)_\(feedID)"
		case .folder(let accountID, let folderName):
			return "folder: \(accountID)_\(folderName)"
		}
	}
	
	var userInfo: [AnyHashable: AnyHashable] {
		switch self {
		case .smartFeed(let id):
			return [
				"type": "smartFeed",
				"id": id
			]
		case .script(let id):
			return [
				"type": "script",
				"id": id
			]
		case .feed(let accountID, let feedID):
			return [
				"type": "feed",
				"accountID": accountID,
				"feedID": feedID
			]
		case .folder(let accountID, let folderName):
			return [
				"type": "folder",
				"accountID": accountID,
				"folderName": folderName
			]
		}
	}
	
	init?(userInfo: [AnyHashable: AnyHashable]) {
		guard let type = userInfo["type"] as? String else { return nil }
		
		switch type {
		case "smartFeed":
			guard let id = userInfo["id"] as? String else { return nil }
			self = SidebarItemIdentifier.smartFeed(id)
		case "script":
			guard let id = userInfo["id"] as? String else { return nil }
			self = SidebarItemIdentifier.script(id)
		case "feed":
			guard let accountID = userInfo["accountID"] as? String, let feedID = userInfo["feedID"] as? String else { return nil }
			self = SidebarItemIdentifier.feed(accountID, feedID)
		case "folder":
			guard let accountID = userInfo["accountID"] as? String, let folderName = userInfo["folderName"] as? String else { return nil }
			self = SidebarItemIdentifier.folder(accountID, folderName)
		default:
			return nil
		}
	}

}

extension Feed: SidebarItemIdentifiable {

	var sidebarItemID: SidebarItemIdentifier? {
		guard let accountID = account?.accountID else {
			assertionFailure("Expected feed.account, but got nil.")
			return nil
		}
		return SidebarItemIdentifier.feed(accountID, feedID)
	}
}

extension Folder: SidebarItemIdentifiable {
	
	var sidebarItemID: SidebarItemIdentifier? {
		guard let accountID = account?.accountID else {
			assertionFailure("Expected feed.account, but got nil.")
			return nil
		}
		return SidebarItemIdentifier.folder(accountID, nameForDisplay)
	}
}