DataManager.swift

//
//  DataManager.swift
//  Reminderz
//
//  Created by Cory Bohon on 4/21/16.
//  Copyright © 2016 MartianCraft. All rights reserved.
//

import Foundation

class DataManager {
    
    var storedTodos: Array<TodoItem> = Array()
    
    class var sharedInstance: DataManager {
        struct Static {
            static let instance: DataManager = DataManager()
        }
        
        return Static.instance
    }
    
    init() {
        
        if let data:NSData = NSUserDefaults.standardUserDefaults().objectForKey("todoItems") as? NSData {
            self.storedTodos = NSKeyedUnarchiver.unarchiveObjectWithData(data) as! Array<TodoItem>
            self.saveAndNotify()
        }
    }
    
    func addTodoItem(item: TodoItem) {
        self.storedTodos.append(item)
        self.saveAndNotify()
    }
    
    func removeTodoItem(item: TodoItem) {
        if self.storedTodos.contains(item) {
            if let indexToRemove = self.storedTodos.indexOf(item) {
                self.storedTodos.removeAtIndex(indexToRemove)
                self.saveAndNotify()
            }
        }
    }
    
    func saveAndNotify() {
        
        self.storedTodos.sortInPlace { (todo1: TodoItem, todo2: TodoItem) -> Bool in
            if todo1.todoDueDate.compare(todo2.todoDueDate) == .OrderedDescending {
                return true
            }
            
            return false
        }
        
        let data: NSData = NSKeyedArchiver.archivedDataWithRootObject(self.storedTodos)
        NSUserDefaults.standardUserDefaults().setObject(data, forKey: "todoItems")
        NSNotificationCenter.defaultCenter().postNotificationName("dataAvailable", object: nil)
    }
  }