/*
Copyright (c) 2006 Bob Aman (sporkmonger.com)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

#import "RMUDAnsiTextView.h"

#define DEFAULT_FOREGROUND 30
#define DEFAULT_BACKGROUND 47

id rgb(int r, int g, int b) {
    return [NSColor colorWithDeviceRed: r/255.0 green: g/255.0 blue: b/255.0 alpha: 1.0];
}

id to_num(int n) {
    return [NSNumber numberWithInt: n];
}

@implementation RMUDAnsiTextView
- (void)dealloc
{
  if (ansiColorTable) {
    [ansiColorTable release];
  }
  if (ansiSequenceRegex) {
    [ansiSequenceRegex release];
  }
  [super dealloc];
}
- (void)awakeFromNib
{
  ansiColorTable =
    [NSDictionary dictionaryWithObjectsAndKeys:
      rgb(0, 0, 0), to_num(30),
      rgb(190, 25, 25), to_num(31),
      rgb(60, 190, 60), to_num(32),
      rgb(200, 200, 75), to_num(33),
      rgb(0, 40, 185), to_num(34),
      rgb(170, 60, 190), to_num(35),
      rgb(50, 200, 200), to_num(36),
      rgb(255, 255, 255), to_num(37),
      rgb(255, 255, 255), to_num(39),
      rgb(0, 0, 0), to_num(40),
      rgb(190, 25, 25), to_num(41),
      rgb(60, 190, 60), to_num(42),
      rgb(200, 200, 75), to_num(43),
      rgb(0, 40, 185), to_num(44),
      rgb(170, 60, 190), to_num(45),
      rgb(50, 200, 200), to_num(46),
      rgb(255, 255, 255), to_num(47),
      rgb(255, 255, 255), to_num(49),
      nil];
  currentForegroundColorIndex = DEFAULT_FOREGROUND;
  currentBackgroundColorIndex = DEFAULT_BACKGROUND;
  
  ansiSequenceRegex =
    [AGRegex regexWithPattern:@"\\e\\[(\\d+;)?(\\d+;)?(\\d+;)?(\\d+;)?(\\d+)m"
                      options:0];

  [ansiSequenceRegex retain];
  [ansiColorTable retain];
  [self setFont:[NSFont fontWithName:@"Monaco" size:12.0]];
}
- (BOOL)isOpaque
{
  return YES;
}
- (NSColor *)currentForegroundColor
{
  if (currentForegroundColorIndex == -1) {
    return nil;
  } else {
    return [ansiColorTable objectForKey:to_num(currentForegroundColorIndex)];
  }
}
- (NSColor *)currentBackgroundColor
{
  if (currentBackgroundColorIndex == -1) {
    return nil;
  } else {
    return [ansiColorTable objectForKey:to_num(currentBackgroundColorIndex)];
  }
}
- (void)setAnsiString:(NSString *)ansiString
{
  [self setString:@""];
  [self appendAnsiString:ansiString];
}
- (void)appendAnsiString:(NSString *)ansiString
{
  NSString *remainingAnsiString = [ansiString copy];
  while ([remainingAnsiString length] != 0) {
    AGRegexMatch *match =
      [ansiSequenceRegex findInString:remainingAnsiString];
    if (match) {
      // ANSI sequence present, isolate it, change the current color, then
      // continue.
      NSString *ansiSequence = [[match group] copy];
      int ansiSequenceIndex = [match range].location;
      NSString *beforeSequence =
        [remainingAnsiString substringToIndex:ansiSequenceIndex];
      NSString *afterSequence =
        [remainingAnsiString substringFromIndex:
          (ansiSequenceIndex + [match range].length)];
      NSAttributedString *insertionString =
        [[NSAttributedString alloc]
          initWithString: [beforeSequence copy]
              attributes:
                [NSDictionary dictionaryWithObjectsAndKeys:
                  [self font], NSFontAttributeName,
                  [self currentForegroundColor], NSForegroundColorAttributeName,
                  [self currentBackgroundColor], NSBackgroundColorAttributeName,
                  nil]];
      [[self textStorage] appendAttributedString:insertionString];
      [self handleAnsiSequence:ansiSequence];
      remainingAnsiString = [afterSequence copy];
    } else {
      // No ANSI sequence present, just insert the string with the current
      // color.
      NSAttributedString *insertionString =
        [[NSAttributedString alloc]
          initWithString: [remainingAnsiString copy]
              attributes:
                [NSDictionary dictionaryWithObjectsAndKeys:
                  [self font], NSFontAttributeName,
                  [self currentForegroundColor], NSForegroundColorAttributeName,
                  [self currentBackgroundColor], NSBackgroundColorAttributeName,
                  nil]];
      [[self textStorage] appendAttributedString:insertionString];
      remainingAnsiString = @"";
    }
  }
  [[NSRunLoop currentRunLoop]
    performSelector: @selector(didChangeText)
             target: self
           argument: nil
              order: 0
              modes: [NSArray arrayWithObjects: NSDefaultRunLoopMode, nil]];
}
- (void)handleAnsiSequence:(NSString *)ansiSequence
{
  AGRegexMatch *match = [ansiSequenceRegex findInString:ansiSequence];
  NSMutableArray *options = [NSMutableArray array];
  int i;
  for (i = 1; i < [match count]; i++) {
    NSString *capture = [match groupAtIndex:i];
    if (capture) {
      [options addObject:to_num([capture intValue])];
    }
  }
  for (i = 0; i < [options count]; i++) {
    NSNumber *option = [options objectAtIndex:i];
    if ([[ansiColorTable allKeys] containsObject:option]) {
      int index = [option intValue];
      if ((index == 0) || (index == 39))
        currentForegroundColorIndex = DEFAULT_FOREGROUND;
      if ((index == 0) || (index == 49))
        currentBackgroundColorIndex = DEFAULT_BACKGROUND;
      if ((index >= 30) && (index <= 38))
        currentForegroundColorIndex = index;
      if ((index >= 40) && (index <= 48))
        currentBackgroundColorIndex = index;
    }
  }
  [options release];
}
- (void)didChangeText
{
  [super didChangeText];
  NSClipView *clipView = (NSClipView *)[self superview];
  NSScrollView *scrollView = (NSScrollView *)[clipView superview];
  NSPoint proposedScrollPoint = NSMakePoint(0.0, [self frame].size.height);
  NSPoint scrollPoint = [clipView constrainScrollPoint:proposedScrollPoint];
  [clipView scrollToPoint:scrollPoint];
  [scrollView reflectScrolledClipView:clipView];
}

- (void)clear
{
	[self setAnsiString:@""];
	currentForegroundColorIndex = DEFAULT_FOREGROUND;
	currentBackgroundColorIndex = DEFAULT_BACKGROUND;
}
@end