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import Foundation
import UIKit
import CoreData

class TableFetchedResultsControllerDelegate: NSObject, NSFetchedResultsControllerDelegate {
    let tableView:UITableView
    
    init(tableView:UITableView) {
        self.tableView = tableView
    }
    public func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
        switch(type) {
        case .insert:
            if let newIndexPath = newIndexPath {
                tableView .insertRows(at: [newIndexPath], with: .fade)
            }
        case .delete:
            if let indexPath = indexPath {
                tableView .deleteRows(at: [indexPath], with: .fade)
            }
        case .update:
            if let indexPath = indexPath {
                tableView.reloadRows(at: [indexPath], with: .fade)
            }
        case .move:
            if let indexPath = indexPath {
                tableView .deleteRows(at: [indexPath], with: .fade)
            }
            if let newIndexPath = newIndexPath {
                tableView .insertRows(at: [newIndexPath], with: .fade)
            }
        }
        
    }
    
    public func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange sectionInfo: NSFetchedResultsSectionInfo, atSectionIndex sectionIndex: Int, for type: NSFetchedResultsChangeType) {
        
        switch(type) {
        case .insert:
            tableView.insertSections(IndexSet(integer: sectionIndex), with: .fade)
        case .delete:
            tableView.deleteSections(IndexSet(integer: sectionIndex), with: .fade)
        default:
            break
        }
        
    }
    
    public func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
        tableView.beginUpdates()
    }
    
    public func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
        tableView.endUpdates()
    }
}