//
//  FeedListViewController.swift
//  Evergreen
//
//  Created by Brent Simmons on 11/1/17.
//  Copyright © 2017 Ranchero Software. All rights reserved.
//

import Cocoa
import RSTree

final class FeedListViewController: NSViewController {

	@IBOutlet var outlineView: NSOutlineView!
	private let treeControllerDelegate = FeedListTreeControllerDelegate()
	lazy var treeController: TreeController = {
		TreeController(delegate: treeControllerDelegate)
	}()

}

// MARK: - NSOutlineViewDataSource

extension FeedListViewController: NSOutlineViewDataSource {

	func outlineView(_ outlineView: NSOutlineView, numberOfChildrenOfItem item: Any?) -> Int {
		
		return nodeForItem(item as AnyObject?).numberOfChildNodes
	}

	func outlineView(_ outlineView: NSOutlineView, child index: Int, ofItem item: Any?) -> Any {

		return nodeForItem(item as AnyObject?).childNodes![index]
	}

	func outlineView(_ outlineView: NSOutlineView, isItemExpandable item: Any) -> Bool {

		return nodeForItem(item as AnyObject?).canHaveChildNodes
	}

	private func nodeForItem(_ item: AnyObject?) -> Node {

		if item == nil {
			return treeController.rootNode
		}
		return item as! Node
	}
}