#import "AboutBox.h"

@implementation AboutBox

static AboutBox *sharedInstance = nil;

+ (AboutBox *)sharedInstance

{

    return sharedInstance ? sharedInstance : [[self alloc] init];

}

- (id)init 

{

    if (sharedInstance) {

        [self dealloc];

    } else {

        sharedInstance = [super init];

    }

    return sharedInstance;

}

- (IBAction)showPanel:(id)sender

{

    if (!appNameField)

    {

        NSWindow *theWindow;

        NSString *creditsPath;

        NSAttributedString *creditsString;

        NSString *appName;

        NSString *versionString;

        NSString *copyrightString;

        NSDictionary *infoDictionary;

        CFBundleRef localInfoBundle;

        NSDictionary *localInfoDict;

        if (![NSBundle loadNibNamed:@"AboutBox" owner:self])

        {

            // int NSRunCriticalAlertPanel(NSString *title, 

            //      NSString *msg, NSString *defaultButton, 

            //      NSString *alternateButton, NSString *otherButton, ...);

            NSLog( @"Failed to load AboutBox.nib" );

            NSBeep();

            return;

        }

        theWindow = [appNameField window];

        // Get the info dictionary (Info.plist)

        infoDictionary = [[NSBundle mainBundle] infoDictionary];

        // Get the localized info dictionary (InfoPlist.strings)

        localInfoBundle = CFBundleGetMainBundle();

        localInfoDict = (NSDictionary *)

                        CFBundleGetLocalInfoDictionary( localInfoBundle );

        // Setup the app name field

        appName = [localInfoDict objectForKey:@"CFBundleName"];

        [appNameField setStringValue:appName];

        // Set the about box window title

        [theWindow setTitle:[NSString stringWithFormat:@"About %@", appName]];

        // Setup the version field

        versionString = [infoDictionary objectForKey:@"CFBundleVersion"];

        [versionField setStringValue:[NSString stringWithFormat:@"Version %@", 

                                                          versionString]];

        // Setup our credits

        creditsPath = [[NSBundle mainBundle] pathForResource:@"About" 

                                             ofType:@"rtf"];

        creditsString = [[NSAttributedString alloc] initWithPath:creditsPath 

                                                    documentAttributes:nil];

        [notesField replaceCharactersInRange:NSMakeRange( 0, 0 ) 

                      withRTF:[creditsString RTFFromRange:

                               NSMakeRange( 0, [creditsString length] ) 

                                             documentAttributes:nil]];

        [self hiliteAndActivateURLs:notesField];

        // Setup the copyright field

        copyrightString = [localInfoDict objectForKey:@"NSHumanReadableCopyright"];

        [copyrightField setStringValue:copyrightString];

        // Setup the window

        [theWindow setExcludedFromWindowsMenu:YES];

        [theWindow setMenu:nil];

        [theWindow center];

    }

    // Show the window

    [[appNameField window] makeKeyAndOrderFront:nil];

}

- (void)hiliteAndActivateURLs:(NSTextView*)textView 

{

    NSTextStorage* textStorage=[textView textStorage];

    NSString* string=[textStorage string];

    NSRange searchRange=NSMakeRange(0, [string length]);

    NSRange foundRange;

    [textStorage beginEditing];

    do 

    {

        //We assume that all URLs start with http://

        foundRange=[string rangeOfString:@"http://" options:0 range:searchRange];

        if (foundRange.length > 0) 

        { //Did we find a URL?

            NSURL* theURL;

            NSDictionary* linkAttributes;

            NSRange endOfURLRange;

            //Restrict the searchRange so that it won't find the same string again

            searchRange.location=foundRange.location+foundRange.length;

            searchRange.length = [string length]-searchRange.location;

            //We assume the URL ends with whitespace

            endOfURLRange=[string rangeOfCharacterFromSet:

                [NSCharacterSet whitespaceAndNewlineCharacterSet]

                options:0 range:searchRange];

            //The URL could also end at the end of the text.  The next line fixes it in case it does

            if (endOfURLRange.location==0) 

            endOfURLRange.location=[string length]-1;

            //Set foundRange's length to the length of the URL

            foundRange.length = endOfURLRange.location-foundRange.location+1;

            //grab the URL from the text

            theURL=[NSURL URLWithString:[string substringWithRange:foundRange]];

            //Make the link attributes

            linkAttributes= [NSDictionary dictionaryWithObjectsAndKeys: theURL, NSLinkAttributeName,

                [NSNumber numberWithInt:NSSingleUnderlineStyle], NSUnderlineStyleAttributeName,

                [NSColor blueColor], NSForegroundColorAttributeName,

                NULL];

            //Finally, apply those attributes to the URL in the text

            [textStorage addAttributes:linkAttributes range:foundRange];

        }

    } 

    while (foundRange.length!=0); //repeat the do block until it no longer finds anything

    //*****************************************

    //Here we go again to look for mailto: URLs

    //*****************************************

    searchRange=NSMakeRange(0, [string length]);

    do 

    {

        //We assume that all URLs start with http://

        foundRange=[string rangeOfString:@"mailto:" options:0 range:searchRange];

        if (foundRange.length > 0) 

        { //Did we find a URL?

            NSURL* theURL;

            NSDictionary* linkAttributes;

            NSRange endOfURLRange;

            //Restrict the searchRange so that it won't find the same string again

            searchRange.location=foundRange.location+foundRange.length;

            searchRange.length = [string length]-searchRange.location;

            //We assume the URL ends with whitespace

            endOfURLRange=[string rangeOfCharacterFromSet:

                [NSCharacterSet whitespaceAndNewlineCharacterSet]

                options:0 range:searchRange];

            //The URL could also end at the end of the text.  The next line fixes it in case it does

            if (endOfURLRange.location==0) 

            endOfURLRange.location=[string length]-1;

            //Set foundRange's length to the length of the URL

            foundRange.length = endOfURLRange.location-foundRange.location+1;

            //grab the URL from the text

            theURL=[NSURL URLWithString:[string substringWithRange:foundRange]];

            //Make the link attributes

            linkAttributes= [NSDictionary dictionaryWithObjectsAndKeys: theURL, NSLinkAttributeName,

                [NSNumber numberWithInt:NSSingleUnderlineStyle], NSUnderlineStyleAttributeName,

                [NSColor blueColor], NSForegroundColorAttributeName,

                NULL];

            //Finally, apply those attributes to the URL in the text

            [textStorage addAttributes:linkAttributes range:foundRange];

        }

    } 

    while (foundRange.length!=0); //repeat the do block until it no longer finds anything

    [textStorage endEditing];

}

- (BOOL)textView:(NSTextView*)textView clickedOnLink:(id)link 

atIndex:(unsigned)charIndex {

     BOOL success;

     success=[[NSWorkspace sharedWorkspace] openURL: link];

     return success;

}

@end