//
//  DocHubLocation.swift
//  DocHub
//
//  Created by Tristan Juricek on 6/24/14.
//  Copyright (c) 2014 Perforce. All rights reserved.
//

import AppKit
import Foundation

// Tracks the current location of "where" we are in the application
class DocHubLocation : NSObject {
    
    let libraryObserver = PropertyObserver<Library>()
    let areaObserver = PropertyObserver<Area>()
    let directoryObserver = PropertyObserver<Directory>()
    let fileObserver = PropertyObserver<File>()
    
    var library:Library? {
        willSet(newLib) {
            area = nil
            directory = nil
            file = nil
        }
        didSet {
            if let lib = library {
                libraryObserver.fire(lib)
            }
        }
    }
    var area:Area? {
        willSet(newArea) {
            directory = nil
            file = nil
        }
        didSet {
            if let ar = area {
                areaObserver.fire(ar)
            }
        }
    }
    var directory:Directory? {
        willSet(newDir) {
            file = nil
        }
        didSet {
            if let dir = directory {
                directoryObserver.fire(dir)
            }
        }
    }
    var file:File? {
        didSet {
            if let ff = file {
                fileObserver.fire(ff)
            }
        }
    }
    
    var directoryCount:Int {
        var count = 0
        var dir = directory
        if dir {
            count++
            while dir?.parent {
                count++
            }
        }
        return count
    }
    
    func directoryAt(index:Int) -> DirectoryLike? {
        if area == nil {
            return nil
        }
        
        if index == 0 {
            return area!
        }
        
        var idx = index - 1
        var dir = directory
        
        while idx > 0 && dir {
            idx--
            dir = dir!.parent
        }
        
        return dir
    }
}