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class AppPersistentContainer {
    
    static let sharedInstance = AppPersistentContainer()

    lazy var container: NSPersistentContainer = {
        self.deleteCoreDataFiles()
        let container = NSPersistentContainer(name: "CozyDen")
        loadPersistentStore(container:container, shouldDeleteAndRetry: true)
        container.viewContext.automaticallyMergesChangesFromParent = true
        
        return container
    }()
    
    private func loadPersistentStore(container: NSPersistentContainer, shouldDeleteAndRetry: Bool) {
        container.loadPersistentStores(completionHandler: { [unowned self]  (storeDescription, error) in
            if let error = error as NSError? {
                if (shouldDeleteAndRetry) {
                    print("Unresolved error \(error), \(error.userInfo)")
                    print("Deleting Core Data Files...")
                    self.deleteCoreDataFiles()
                    self.loadPersistentStore(container: container, shouldDeleteAndRetry: false)
                    return
                }
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
    }
    
    private func deleteCoreDataFiles() {
        let directoryURL = NSPersistentContainer.defaultDirectoryURL()
        let fileManager = FileManager()
        do {
            let contents = try fileManager.contentsOfDirectory(atPath: directoryURL.path)
            for path in contents {
                let fileURL = directoryURL.appendingPathComponent(path)
                do {
                    try fileManager.removeItem(atPath: fileURL.path)
                }
                catch {
                    print("Error deleting file \(fileURL)")
                }
            }
        }
        catch {
            print("Error deleting core data files")
        }
    }
}