GBA002/Delta/Database/Model/Human/Game.swift

//
//  Game.swift
//  Delta
//
//  Created by Riley Testut on 10/3/15.
//  Copyright © 2015 Riley Testut. All rights reserved.
//

import Foundation

import DeltaCore

@objc(Game)
public class Game: _Game, GameProtocol
{
    public var fileURL: URL {
        var fileURL: URL!
        
        self.managedObjectContext?.performAndWait {
            fileURL = DatabaseManager.gamesDirectoryURL.appendingPathComponent(self.filename)
        }
        
        return fileURL
    }
}

extension Game
{
    override public func prepareForDeletion()
    {
        super.prepareForDeletion()
        
        guard let managedObjectContext = self.managedObjectContext else { return }
        
        // If a game with the same identifier is also currently being inserted, Core Data is more than likely resolving a conflict by deleting the previous instance
        // In this case, we make sure we DON'T delete the game file + misc other Core Data relationships, or else we'll just lose all that data
        guard !managedObjectContext.insertedObjects.contains(where: { ($0 as? Game)?.identifier == self.identifier }) else { return }
        
        guard FileManager.default.fileExists(atPath: self.fileURL.path) else { return }
        
        do
        {
            try FileManager.default.removeItem(at: self.fileURL)
        }
        catch
        {
            print(error)
        }
        
        for collection in self.gameCollections where collection.games.count == 1
        {
            // Once this game is deleted, collection will have 0 games, so we should delete it
            managedObjectContext.delete(collection)
        }
        
        // Manually cascade deletion since SaveState.fileURL references Game, and so we need to ensure we delete SaveState's before Game
        // Otherwise, we crash when accessing SaveState.game since it is nil
        for saveState in self.saveStates
        {
            managedObjectContext.delete(saveState)
        }
        
        if managedObjectContext.hasChanges
        {
            managedObjectContext.saveWithErrorLogging()
        }
    }
}