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/*
 *  R.app : a Cocoa front end to: "R A Computer Language for Statistical Data Analysis"
 *  
 *  R.app Copyright notes:
 *                     Copyright (C) 2004-5  The R Foundation
 *                     written by Stefano M. Iacus and Simon Urbanek
 *
 *                  
 *  R Copyright notes:
 *                     Copyright (C) 1995-1996   Robert Gentleman and Ross Ihaka
 *                     Copyright (C) 1998-2001   The R Development Core Team
 *                     Copyright (C) 2002-2004   The R Foundation
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  A copy of the GNU General Public License is available via WWW at
 *  http://www.gnu.org/copyleft/gpl.html.  You can also obtain it by
 *  writing to the Free Software Foundation, Inc., 59 Temple Place,
 *  Suite 330, Boston, MA  02111-1307  USA.
 */

#import "RGUI.h"
#import "SelectList.h"

static SelectList *sharedController = nil;

@implementation SelectList

BOOL IsSelectList;

- (id)init
{
    self = [super init];
    if (self) {
        sharedController = self;
        [listDataSource setTarget: self];
        totalItems = 0;
        listItem = 0;
        result = -1;
        title = nil;
        running = NO;
    }
    
    return self;
}

+ (SelectList*) sharedController
{
    return sharedController;
}

- (void)dealloc {
    [super dealloc];
}

/* These two routines are needed to update the SelectList TableView */
- (NSInteger)numberOfRowsInTableView: (NSTableView *)tableView
{
    return totalItems;
}

- (id)tableView: (NSTableView *)tableView objectValueForTableColumn: (NSTableColumn *)tableColumn row: (NSInteger)row
{
    if (row<totalItems) {
        if([[tableColumn identifier] isEqualToString:@"item"])
            return listItem[row];
    }
    return nil; 
}

- (id) window
{
    return SelectListWindow;
}

- (void) reloadData
{
    [listDataSource reloadData];
}

- (void) resetListItems
{
    if (!totalItems || !listItem) return;
    int i=0;
    while (i<totalItems) {
        [listItem[i] release];
        i++;
    }
    free(listItem);
    totalItems=0;
}

- (int) selectList: (int) count withNames: (char**) item status: (BOOL*) stat multiple: (BOOL) multiple title: (NSString*) ttl
{
    NSAutoreleasePool *pool = nil;
    int i=0, k=0;
    title = ttl;
    result = -1;
    
    [listDataSource setAllowsMultipleSelection: multiple];

    if (totalItems) [self resetListItems];
    if (count<1)
        return 0;   
    
    listItem = (NSString**) malloc(sizeof(NSString*) * count);
    while (i<count) {
        listItem[i] =[[NSString alloc] initWithUTF8String: item[i]];
        i++;
    }
    totalItems = count;
    [listDataSource deselectAll:self];
    [listDataSource reloadData]; // make sure we have all data loaded before proceeding with the selection

    pool = [[NSAutoreleasePool alloc] init];    
    
    if (stat)
        for(i=0; i<totalItems; i++){
            if(stat[i]){
                k++;
                [listDataSource selectRowIndexes:[NSIndexSet indexSetWithIndex:i] 
                            byExtendingSelection:(k!=1)?YES:NO];
            }
        };
    
    [[self window] setTitle:title];
    running = YES;
    { /* try to be smart - resize the window such that the all items are visible (with an upper limit) */
        NSRect rw = [[self window] frame];
        NSRect rf = [listDataSource visibleRect];
        NSRect rr = [listDataSource frameOfCellAtColumn:0 row:0];
        NSRect rl = [listDataSource frameOfCellAtColumn:0 row:1];

        float nonTableH = rw.size.height - rf.size.height;
        float showCount = ((float)((count>20)?20:count));
        
        if (count==1) rl.origin.y = rr.origin.y + rr.size.height + 1.0; // rl will be bogus if there is just 1 entry, so we need to fake it
        
        rw.size.height = nonTableH + rr.origin.y + (rl.origin.y-rr.origin.y)*showCount - 1.0;

        [[self window] setFrame:rw display:YES];
    }
    [self show];
    [NSApp runModalForWindow:[self window]];
    
    if (result == 1) {
        NSIndexSet *rows =  [listDataSource selectedRowIndexes];            
        NSUInteger current_index = [rows firstIndex];
        
        if(current_index == NSNotFound)
            return 0;
        
        if (stat) {
            memset(stat, 0, sizeof(BOOL)*count);
            while (current_index != NSNotFound) {
                stat[current_index] = YES;
                current_index = [rows indexGreaterThanIndex: current_index];
            }
        }
    }
    
    [pool release];
    [self resetListItems];
    
    return result;
}

- (int) count
{
    return totalItems;
}

- (void) show
{
    [listDataSource reloadData];
    [[self window] makeKeyAndOrderFront:self];
}


- (IBAction)returnSelected:(id)sender
{
    result = 1;
    
    [[self window] performClose: sender];

}

- (BOOL)windowShouldClose:(id)sender{
    
    if(running){
        [NSApp stopModal];
        running = NO;
    }
    return YES; 
}

- (IBAction)cancelSelection:(id)sender
{
    result = 0;

    [[self window] performClose: sender];
}

@end