ViewController.swift

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

import Cocoa

class ViewController: NSViewController, NSTableViewDataSource, NSTableViewDelegate {
    
    @IBOutlet var tableView: NSTableView!
    @IBOutlet var todoNameField: NSTextField!
    @IBOutlet var todoDueDatePicker: NSDatePicker!
    
    let dateFormatter: NSDateFormatter = NSDateFormatter()

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        self.todoDueDatePicker.dateValue = NSDate()
        self.todoNameField.becomeFirstResponder()
        
        self.dateFormatter.timeStyle = .ShortStyle
        self.dateFormatter.dateStyle = .ShortStyle
        
        self.tableView.setDelegate(self)
        self.tableView.setDataSource(self)
        
        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(updateData(_:)), name: "dataAvailable", object: nil)
    }

    @IBAction func saveButtonClicked(sender: NSButton) {
        
        if self.todoNameField.stringValue.characters.count > 0 {
            let todoItem: TodoItem = TodoItem()
            todoItem.setTodo(self.todoNameField.stringValue, dueDate: self.todoDueDatePicker.dateValue)
            DataManager.sharedInstance.addTodoItem(todoItem)
            
            self.todoNameField.stringValue = ""
            self.todoDueDatePicker.dateValue = NSDate()
        } else {
            let alertView: NSAlert = NSAlert()
            alertView.alertStyle = .InformationalAlertStyle
            alertView.messageText = "Todo name is invalid"
            alertView.informativeText = "The name field must have a value before adding the todo to the list."
            alertView.runModal()
        }
    }
    
    // Table View Delegate and Data Source 
    func numberOfRowsInTableView(tableView: NSTableView) -> Int {
        return DataManager.sharedInstance.storedTodos.count
    }
    
    func tableView(tableView: NSTableView, viewForTableColumn tableColumn: NSTableColumn?, row: Int) -> NSView? {
        
        if let todoItem:TodoItem = DataManager.sharedInstance.storedTodos[row] {
            
            var stringValue: String = ""
            var cellIdentifier: String = ""
            
            if tableColumn?.identifier == "itemColumn" {
                stringValue = todoItem.todoName
                cellIdentifier = "nameCell"
            } else if tableColumn?.identifier == "dueDateColumn" {
                stringValue = self.dateFormatter.stringFromDate(todoItem.todoDueDate)
                cellIdentifier = "dateCell"
            }
            
            if let cell = tableView.makeViewWithIdentifier(cellIdentifier, owner: nil) as? NSTableCellView {
                cell.textField?.stringValue = stringValue
                
                let currentDate: NSDate = NSDate()
                if !todoItem.todoDueDate.earlierDate(currentDate).isEqualToDate(currentDate) {
                    cell.alphaValue = 0.25
                }
                
                return cell
            }
        }
        
        return nil
    }
    
    func updateData(sender: NSNotification) {
        self.tableView.reloadData()
    }
    
    // Keyboard shortcuts
    override func keyDown(theEvent: NSEvent) {
        interpretKeyEvents([theEvent])
    }
    
    override func deleteBackward(sender: AnyObject?) {
        let selectedRow: Int = self.tableView.selectedRow
        if selectedRow == -1 {
            return
        }
        
        DataManager.sharedInstance.removeTodoItem(DataManager.sharedInstance.storedTodos[selectedRow])
    }
}