//
//  LibraryOutlineViewDataSource.swift
//  DocHub
//
//  Created by Tristan Juricek on 6/19/14.
//  Copyright (c) 2014 Perforce. All rights reserved.
//

import AppKit
import Foundation

// Loads all libraries and provides areas as subitems of each library.
class LibraryDataSource: NSObject, NSOutlineViewDataSource {
    
    // Our current source list is just the different library connections
    var libraries:Library[] = []
    
    init() {
        super.init()
        updateLibraries()
    }
    
    func updateLibraries() {
        let p4Settings = P4ConnectionSettings.loadAll()
        var libs:Library[] = []
        for p4setting in p4Settings {
            libs.append(P4Library(settings:p4setting))
        }
        libraries = libs
    }
        
    // Return the child item at the specified index of a given item.
    // If item is nil, return the appropriate child item of the root.
    func outlineView(outlineView: NSOutlineView!,
        child index: Int,
        ofItem item: AnyObject!) -> AnyObject! {
        
        if item == nil {
            return libraries[index]
        } else {
            if let library = getLibraryForItem(item!) {
                return library.areas[index]
            }
        }
           
        return nil
    }
    
    func getLibraryForItem(item: AnyObject) -> Library? {
        for library in libraries {            
            if (item is Library ? true : false) && library == (item as Library){
                return library
            }
        }
        return nil
    }
    
    // Returns true if the item is expandable
    func outlineView(outlineView: NSOutlineView!,
        isItemExpandable item: AnyObject!) -> Bool {
 
        // This appears to be a compiler bug requiring a ternary operator
        return (item is Library ? true : false)
    }
    
    // Returns the number of child items encompassed by a given item.
    func outlineView(outlineView: NSOutlineView!,
        numberOfChildrenOfItem item: AnyObject!) -> Int {

        if item == nil {
            return libraries.count
        } else {
            if let library = getLibraryForItem(item!) {
                return library.areas.count
            }
        }

        return 0
    }
    
    // Invoked by outlineView to return the data object associated with the 
    // specified item.
    func outlineView(outlineView: NSOutlineView!,
        objectValueForTableColumn tableColumn: NSTableColumn!,
        byItem item: AnyObject!) -> AnyObject! {
        
        if (item is Library ? true: false) {
            return (item as Library).name
        }
        return "oops"
    }
    
    // Set the data object for a given item in a given column.
    func outlineView(outlineView: NSOutlineView!,
        setObjectValue object: AnyObject!,
        forTableColumn tableColumn: NSTableColumn!,
        byItem item: AnyObject!) {
        
        // no idea what I need to do here
        println("calling setObjectValue \(item)")
    }
}