- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item
- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item
- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item
- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item

- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item

myObject=[NodeObject new];

myObject =[node copy];    // node != nil is checked before

- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item {
return item; }

#import "OutlineController.h"

@implementation OutlineController {

}


//
//  All items are of type Hierarchy !
//

- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item {
    NSInteger  result=0;
    id kValue=[item anObject];

    if (!item) {
        result = [[delegate dictDataSource] count];
    }
    else {
        if ( [kValue isKindOfClass:[NSDictionary class]] ||
             [kValue isKindOfClass:[NSArray class]]) result=[kValue count];
    }

    NSLog(@"nbr of childs %ld",(long)result);
    return result;
}



- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item {
    BOOL  result=NO;
    id kValue=[item anObject];

    if (!item) {
        result = [[delegate dictDataSource] count] > 0 ? YES:NO;
    }
    else {
        if ( [kValue isKindOfClass:[NSDictionary class]] ||
            [kValue isKindOfClass:[NSArray class]]) result=YES;
    }
    NSLog(@"expandable %d",result);
    return result;
}


//
//  The only place items are created is here !
//
- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item {
    id oneObject;
    Hierarchy *hchy;

    //
    // the root is always of type dictionary, and we take the keys as "index"
    if ( !item ) {
        hchy = [Hierarchy new];
        [hchy setComesFromDict:[delegate dictDataSource]];
        [hchy setKey:[[[hchy comesFromDict] allKeys ] objectAtIndex:index] ];
        oneObject =[[hchy comesFromDict] valueForKey:[hchy key]];
        [hchy setAnObject:oneObject];
    }
    else {
        hchy   = [item copy] ;

        if ([[hchy anObject] isKindOfClass:[NSDictionary class] ]) {
            // Case: item comes from dictionary.
            // ( if item is expandable, outlineview will ask for item of index here.
            //   only dictionary or arrays are expandable )

            [hchy setKey:[[[hchy anObject] allKeys] objectAtIndex:index]];
            oneObject =[[hchy anObject] valueForKey:[hchy key]];
            [hchy setAnObject:oneObject];
        } else
        {
            if  ([[hchy anObject] isKindOfClass:[NSArray class] ]) {
                // Case: item comes from anArray
                // fetching array element
                [hchy setComesFromDict:Nil];
                oneObject =[[hchy anObject] objectAtIndex:index];
                [hchy setAnObject:oneObject];

                [hchy setKey:[NSString stringWithFormat:@"%ld",(long)index]];
            }else
            {   // Case: Item is a value
                //
                NSLog(@"single KV pair : %@",[hchy key]);
                ;
            }
        }
    }

    if ( [[hchy anObject] isKindOfClass:[NSArray class] ] ||
        [[hchy anObject] isKindOfClass:[NSDictionary class] ] ) {
        [hchy setValueText:@""];
        [hchy setIsHeader:YES];
    } else
    {
       [hchy setValueText:[hchy anObject]];
    }
    return hchy;
}

- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item {

    return item;
}