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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) 2004-12  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.
 *
 *  RScriptEditorLayoutManager.m
 *
 *  Created by Hans-J. Bibiko on 01/03/2012.
 *
 */

#import "RScriptEditorLayoutManager.h"
#import "RScriptEditorTypeSetter.h"
#import "RScriptEditorGlyphGenerator.h"
#import "RScriptEditorTextStorage.h"
#import "PreferenceKeys.h"

@implementation RScriptEditorLayoutManager

static SEL _setfSel;
 
- (id)init
{

    self = [super init];
    
    if (nil == self) return nil;

    // Setup LineFoldingTypesetter
    RScriptEditorTypeSetter *typesetter = [[RScriptEditorTypeSetter alloc] init];
    [self setTypesetter:typesetter];
    [typesetter release];
    
    // Setup LineFoldingGlyphGenerator
    RScriptEditorGlyphGenerator *glyphGenerator = [[RScriptEditorGlyphGenerator alloc] init];
    [self setGlyphGenerator:glyphGenerator];
    [glyphGenerator release];

    [self setBackgroundLayoutEnabled:YES];

    _setfSel = @selector(setLineFoldingEnabled:);

    return self;

}

- (void)dealloc
{
    if(_attributedString) [_attributedString release];
    [super dealloc];
}

- (void)replaceTextStorage:(id)textStorage
{
    if(_attributedString) [_attributedString release];
    _attributedString = [(RScriptEditorTextStorage*)textStorage retain];
    _setfImp  = [_attributedString methodForSelector:_setfSel];
    [(RScriptEditorGlyphGenerator*)[self glyphGenerator] setTextStorage:textStorage];
    [super replaceTextStorage:textStorage];
}

// - (void)drawGlyphsForGlyphRange:(NSRange)glyphsToShow atPoint:(NSPoint)origin
// {
//  // (*_setfImp)(_attributedString, _setfSel, YES);
//  [super drawGlyphsForGlyphRange:glyphsToShow atPoint:origin];
//  // (*_setfImp)(_attributedString, _setfSel, NO);
// }

// - (void)textStorage:(RScriptEditorTextStorage *)str edited:(NSUInteger)editedMask range:(NSRange)newCharRange changeInLength:(NSInteger)delta invalidatedRange:(NSRange)invalidatedCharRange
// {
// 
//  NSUInteger length = [str length];
// //   NSNumber *value;
//  NSRange effectiveRange, range;
//  NSInteger foldIndex;
// 
//  // it's at the end. check if the last char is in foldingAttributeName
//  if ((invalidatedCharRange.location == length) && (invalidatedCharRange.location != 0)) { 
//      // value = [str attribute:foldingAttributeName atIndex:invalidatedCharRange.location - 1 effectiveRange:&effectiveRange];
//      // if (value && [value boolValue]) invalidatedCharRange = NSUnionRange(invalidatedCharRange, effectiveRange);
//      foldIndex = [str foldedForIndicatorAtIndex:invalidatedCharRange.location - 1];
//      effectiveRange = [str foldedRangeAtIndex:foldIndex];
//      effectiveRange.location++;
//      effectiveRange.length-=2;
//      if(foldIndex > -1) invalidatedCharRange = NSUnionRange(invalidatedCharRange, effectiveRange);
//  }
// 
//  if (invalidatedCharRange.location < length) {
//      NSString *string = [str string];
//      NSUInteger start, end;
//      if (delta > 0) {
//          NSUInteger contentsEnd;
//          [string getParagraphStart:NULL end:&end contentsEnd:&contentsEnd forRange:newCharRange];
//          if ((contentsEnd != end) && (invalidatedCharRange.location > 0) 
//              && (NSMaxRange(newCharRange) == end)) { 
//              // there was para sep insertion. extend to both sides
//              if (newCharRange.location <= invalidatedCharRange.location) {
//                  invalidatedCharRange.length = (NSMaxRange(invalidatedCharRange) - (newCharRange.location - 1));
//                  invalidatedCharRange.location = (newCharRange.location - 1);
//              }
// 
//              if ((end < length) && (NSMaxRange(invalidatedCharRange) <= end)) {
//                  invalidatedCharRange.length = ((end + 1) - invalidatedCharRange.location);
//              }
//          }
//      }
// 
//      range = invalidatedCharRange;
// 
//      while ((range.location > 0) || (NSMaxRange(range) < length)) {
//          [string getParagraphStart:&start end:&end contentsEnd:NULL forRange:range];
//          range.location = start;
//          range.length = (end - start);
// 
//          // Extend backward
//          foldIndex = [str foldedForIndicatorAtIndex:range.location];
//          if(foldIndex > -1) {
//              effectiveRange = [str foldedRangeAtIndex:foldIndex];
//              if(effectiveRange.length) {
//                  // value = [str attribute:foldingAttributeName atIndex:range.location longestEffectiveRange:&effectiveRange inRange:NSMakeRange(0, range.location + 1)];
//                  // if (value && [value boolValue] && (effectiveRange.location < range.location)) {
//                  effectiveRange.location++;
//                  if (effectiveRange.location < range.location) {
//                      range.length += (range.location - effectiveRange.location);
//                      range.location = effectiveRange.location;
//                  }
//              }
//          }
//          // Extend forward
//          if (NSMaxRange(range) < length) {
//              // value = [str attribute:foldingAttributeName atIndex:NSMaxRange(range) longestEffectiveRange:&effectiveRange inRange:NSMakeRange(NSMaxRange(range), length - NSMaxRange(range))];
//              // if (value && [value boolValue] && (NSMaxRange(effectiveRange) > NSMaxRange(range))) {
//              foldIndex = [str foldedForIndicatorAtIndex:NSMaxRange(range)];
//              if(foldIndex > -1) {
//                  effectiveRange = [str foldedRangeAtIndex:foldIndex];
//                  if(effectiveRange.length) {
//                      effectiveRange.location++;
//                      effectiveRange.length-=2;
//                      if(NSMaxRange(effectiveRange) > NSMaxRange(range)) {
//                          range.length = NSMaxRange(effectiveRange) - range.location;
//                      }
//                  }
//              }
//          }
// 
//          if (NSEqualRanges(range, invalidatedCharRange)) break;
//          invalidatedCharRange = range;
//      }
//  }
// 
//  [super textStorage:str edited:editedMask range:newCharRange changeInLength:delta invalidatedRange:invalidatedCharRange];
// 
// }

@end