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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.
 *
 *  Created by Simon Urbanek on 5/11/05.
 *  $Id: RTextView.m 4196 2007-03-23 13:35:40Z urbaneks $
 */

#import "RTextView.h"

#import "RGUI.h"

#define kTALinked @"RTVLinkedChar"
#define TAVal @""

BOOL RTextView_autoCloseBrackets = YES;

@interface RTextView (Private)
BOOL console;
@end

@implementation RTextView

/* we don't need custom init, but in case it's necessary just uncomment this
- (id) initWithCoder: (NSCoder*) coder
{
    self = [super initWithCoder:coder];
    if (self) {
    }
    return self;
}
*/

- (void) awakeFromNib
{
    SLog(@"RTextView: awakeFromNib %@", self);
    console = NO;
}

- (void)keyDown:(NSEvent *)theEvent
{
    NSString *rc = [theEvent charactersIgnoringModifiers];
    NSString *cc = [theEvent characters];
    unsigned int modFlags = [theEvent modifierFlags];
    SLog(@"RTextView: keyDown: %@ *** \"%@\" %d", theEvent, rc, modFlags);
    if ([rc isEqual:@"."] && (modFlags&(NSShiftKeyMask|NSControlKeyMask|NSAlternateKeyMask|NSCommandKeyMask))==NSControlKeyMask) {
        SLog(@" - send complete: to self");
        [self complete:self];
        return;
    }
    if ([rc isEqual:@"="]) {
        int mf = modFlags&(NSShiftKeyMask|NSControlKeyMask|NSAlternateKeyMask|NSCommandKeyMask);
        if ( mf ==NSControlKeyMask) {
            [self insertText:@"<-"];
            return;
        }
        if ( mf == NSAlternateKeyMask ) {
            [self insertText:@"!="];
            return;
        }
    }
    if ([rc isEqual:@"-"] && (modFlags&(NSShiftKeyMask|NSControlKeyMask|NSAlternateKeyMask|NSCommandKeyMask))==NSAlternateKeyMask) {
        [self insertText:@" <- "];
        return;
    }
    if (cc && [cc length]==1 && RTextView_autoCloseBrackets) {
        unsigned int ck = [cc characterAtIndex:0];
        NSString *complement = nil;
        switch (ck) {
            case '{':
                complement = @"}";
            case '(':
                if (!complement) complement = @")";
            case '[':
                if (!complement) complement = @"]";
                SLog(@"RTextView: open bracket chracter %c", ck);
                [super keyDown:theEvent];
                {
                    NSRange r = [self selectedRange];
                    if (r.location != NSNotFound) {
                        // NSAttributedString *as = [[NSAttributedString alloc] initWithString:complement attributes:
                        // [NSDictionary dictionaryWithObject:TAVal forKey:kTALinked]];
                        NSTextStorage *ts = [self textStorage];
                        [self replaceCharactersInRange:r withString:complement];
                        r.length=1;
                        [ts addAttribute:kTALinked value:TAVal range:r];
                        r.length=0;
                        [self setSelectedRange:r];
                    }
                    return;
                }
                    
                case '}':
                case ')':
                case ']':
                {
                    NSRange r = [self selectedRange];
                    if (r.location != NSNotFound && r.length == 0) {
                        NSTextStorage *ts = [self textStorage];
                        id attr = nil;
                        @try {
                            attr = [ts attribute:kTALinked atIndex:r.location effectiveRange:0];
                        }
                        @catch (id ue) {}
                        if (attr) {
                            unsigned int cuc = [[ts string] characterAtIndex:r.location];
                            SLog(@"RTextView: encountered linked character '%c', while writing '%c'", cuc, ck);
                            if (cuc == ck) {
                                r.length = 1;
                                SLog(@"RTextView: selecting linked character for removal on type");
                                [self setSelectedRange:r];
                            }
                        }
                    }
                }
                    SLog(@"RTextView: closing bracket chracter %c", ck);
        }
    }
    if ((modFlags&(NSControlKeyMask|NSAlternateKeyMask|NSCommandKeyMask))==NSControlKeyMask) {
        if ([rc isEqual:@"{"]) {
            
        } else if ([rc isEqual:@"}"]) {
            
        }
    }
    [super keyDown:theEvent];
}

- (void) setConsoleMode: (BOOL) isConsole {
    console = isConsole;
    SLog(@"RTextView: set console flag to %@ (%@)", isConsole?@"yes":@"no", self);
}

@end