/*
 author: Onne Gorter
 
 This file is part of AntiRSI.
 
 AntiRSI 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.
 
 AntiRSI 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.
 
 You should have received a copy of the GNU General Public License
 along with AntiRSI; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#import "AntiRSI.h"

#include <math.h>
#include <ApplicationServices/ApplicationServices.h>

extern CFTimeInterval CGSSecondsSinceLastInputEvent(unsigned long eventType);

@implementation AntiRSI

// bindings methods
- (void)setMicro_pause_duration:(float)f
{
	micro_pause_duration = round(f);
	if (s_taking_micro_pause == state) {
		[progress setMaxValue:micro_pause_duration];
		[progress setDoubleValue:micro_pause_taking_t];
	}
}

- (void)setMicro_pause_period:(float)f
{	micro_pause_period = 60 * round(f); }

- (void)setWork_break_duration:(float)f
{   
	work_break_duration = 60 * round(f); 
	if (s_taking_work_break == state) {
		[progress setMaxValue:work_break_duration / 60];
		[progress setDoubleValue:work_break_taking_t / 60 - 0.5];
	}
}

- (void)setWork_break_period:(float)f
{	work_break_period = 60 * round(f); }

- (void)installTimer:(double)interval
{
	if (mtimer != nil) {
		[mtimer invalidate];
		[mtimer autorelease];
	}
	mtimer = [[NSTimer scheduledTimerWithTimeInterval:interval target:self selector:@selector(tick:)
                                             userInfo:nil repeats:YES] retain];
}

- (void)setSample_interval:(NSString *)s
{
	sample_interval = 1;
	if ([s isEqualToString:@"Super Smooth"]) sample_interval = 0.1;
	if ([s isEqualToString:@"Smooth"]) sample_interval = 0.33;
	if ([s isEqualToString:@"Normal"]) sample_interval = 1;
	if ([s isEqualToString:@"Low"]) sample_interval = 2;
	
	[self installTimer:sample_interval];
}

- (void)setDraw_dock_image:(BOOL)b 
{
	draw_dock_image=b;
	if (!b) {
		[NSApp setApplicationIconImage:[NSImage imageNamed:@"AntiRSI"]];
	} else {
		[self drawDockImage];
	}
}

- (void)setBackground:(NSColor *)c
{
	[background autorelease];
	background=[c retain];
	
	// make new darkbackground color
	float r,g,b,a;
	[background getRed:&r green:&g blue:&b alpha:&a];
	[darkbackground autorelease];
	darkbackground=[[NSColor colorWithCalibratedRed:r*0.35 green:g*0.35 blue:b*0.35 alpha:a+0.2] retain];
	
	[self drawDockImage];
}

- (void)setElapsed:(NSColor *)c
{
	[elapsed autorelease];
	elapsed=[c retain];
    [dock_badge setBadgeColor:elapsed];
	[self drawDockImage];
}

- (void)setTaking:(NSColor *)c
{
	[taking autorelease];
	taking=[c retain];
	[self drawDockImage];
}

// end of bindings

- (void)resetTimers;
{
	// set timers to 0
	micro_pause_t = 0;
	work_break_t = 0;
	micro_pause_taking_t = 0;
	work_break_taking_t = 0;
	work_break_taking_cached_t = 0;
	work_break_taking_cached_date = 0;
    session_t = 0;
}

- (void)awakeFromNib
{
	// want transparancy
	[NSColor setIgnoresAlpha:NO];
	
	// initial colors
	elapsed = [[NSColor colorWithCalibratedRed:0.3 green:0.3 blue:0.9 alpha:0.95] retain];
	taking = [[NSColor colorWithCalibratedRed:0.3 green:0.9 blue:0.3 alpha:0.90] retain];
	background = [NSColor colorWithCalibratedRed:0.9 green:0.9 blue:0.9 alpha:0.7];
	
	//initial values
	micro_pause_period = 4*60;
	micro_pause_duration = 13;
	work_break_period = 50*60;
	work_break_duration = 8*60;
	sample_interval = 1;
	
	// set current state
	state = s_normal;
    [self resetTimers];
	
	// initialize dock image
	dock_image = [[NSImage alloc] initWithSize:NSMakeSize(128,128)];
	[dock_image setCacheMode:NSImageCacheNever];
	original_dock_image = [NSImage imageNamed:@"AntiRSI"];
	draw_dock_image_q = YES;
    dock_badge = [[CTBadge systemBadge] retain];
    [dock_badge setBadgeColor:elapsed];
	
	// setup main window that will show either micropause or workbreak
	main_window = [[NSWindow alloc] initWithContentRect:[view frame]
											  styleMask:NSBorderlessWindowMask
												backing:NSBackingStoreBuffered defer:YES];
	[main_window setBackgroundColor:[NSColor clearColor]];
	[main_window setLevel:NSStatusWindowLevel];
	[main_window setAlphaValue:0.85];
	[main_window setOpaque:NO];
	[main_window setHasShadow:NO];
	[main_window setMovableByWindowBackground:YES];
	[main_window center];
	[main_window setContentView:view];
    NSTimeZone *utcZone = [NSTimeZone timeZoneForSecondsFromGMT:0];
    [reset_session_time setTimeZone:utcZone];
    [progress setEnabled:NO];
    NSFont *myriad = [NSFont fontWithName: @"Myriad" size: 40];
    if (myriad) [status setFont: myriad];
	
	// initialze history filter
	h0 = 0;
	h1 = 0;
	h2 = 0;
	
	// initialize ticks
	date = [NSDate timeIntervalSinceReferenceDate];
	
	// set background now
	[self setBackground:background];
	
	// create initial values
	NSUserDefaultsController *dc = [NSUserDefaultsController sharedUserDefaultsController];
	NSMutableDictionary* initial = [NSMutableDictionary dictionaryWithObjectsAndKeys:
        [NSNumber numberWithFloat:4], @"micro_pause_period",
        [NSNumber numberWithFloat:13], @"micro_pause_duration",
        [NSNumber numberWithFloat:50], @"work_break_period",
        [NSNumber numberWithFloat:8], @"work_break_duration",
        @"Smooth", @"sample_interval",
        [NSNumber numberWithBool:YES], @"draw_dock_image",
        [NSNumber numberWithBool:YES], @"draw_dock_badge",
        [NSNumber numberWithBool:NO], @"lock_focus",
        [NSNumber numberWithBool:NO], @"reset_session_timer_daily",
        [NSNumber numberWithBool:NO], @"reset_session_timer_after",
        [NSCalendarDate dateWithYear:2000 month:1 day:1 hour:6 minute:0 second:0 timeZone:utcZone], @"reset_session_timer_time",
        [NSNumber numberWithInt:8], @"reset_session_timer_after_hours",
        [NSArchiver archivedDataWithRootObject:elapsed], @"elapsed",
        [NSArchiver archivedDataWithRootObject:taking], @"taking",
        [NSArchiver archivedDataWithRootObject:background], @"background",
        nil];
    [[NSUserDefaults standardUserDefaults] registerDefaults:initial];
	[dc setInitialValues:initial];

	// bind to defauls controller
	[self bind:@"micro_pause_period" toObject:dc withKeyPath:@"values.micro_pause_period" options:nil];
	[self bind:@"micro_pause_duration" toObject:dc withKeyPath:@"values.micro_pause_duration" options:nil];
	[self bind:@"work_break_period" toObject:dc withKeyPath:@"values.work_break_period" options:nil];
	[self bind:@"work_break_duration" toObject:dc withKeyPath:@"values.work_break_duration" options:nil];
	[self bind:@"sample_interval" toObject:dc withKeyPath:@"values.sample_interval" options:nil];
	[self bind:@"draw_dock_image" toObject:dc withKeyPath:@"values.draw_dock_image" options:nil];
    [self bind:@"draw_dock_badge" toObject:dc withKeyPath:@"values.draw_dock_badge" options:nil];
	[self bind:@"lock_focus" toObject:dc withKeyPath:@"values.lock_focus" options:nil];
    [self bind:@"reset_session_timer_daily" toObject:dc withKeyPath:@"values.reset_session_timer_daily" options:nil];
    [self bind:@"reset_session_timer_after" toObject:dc withKeyPath:@"values.reset_session_timer_after" options:nil];
    [self bind:@"reset_session_timer_time" toObject:dc withKeyPath:@"values.reset_session_timer_time" options:nil];
    [self bind:@"reset_session_timer_after_hours" toObject:dc withKeyPath:@"values.reset_session_timer_after_hours" options:nil];
	NSDictionary* unarchive = [NSDictionary dictionaryWithObject:NSUnarchiveFromDataTransformerName forKey:@"NSValueTransformerName"];
	[self bind:@"elapsed" toObject:dc withKeyPath:@"values.elapsed" options:unarchive];
	[self bind:@"taking" toObject:dc withKeyPath:@"values.taking" options:unarchive];
	[self bind:@"background" toObject:dc withKeyPath:@"values.background" options:unarchive];
    
    // watch for timer changes
    [dc addObserver:self forKeyPath:@"values.reset_session_timer_time" options:0 context:NULL];
    
	// alert every binding
	[dc revert:self];

	// start the timer
	[self installTimer:sample_interval];
	
	// about dialog
	[version setStringValue:[NSString stringWithFormat:@"Version %@", sVersion]]; 
}

- (void)computeResetSessionDate;
{
    NSTimeZone *systemZone = [NSTimeZone systemTimeZone];
    NSCalendarDate *today = [NSCalendarDate calendarDate];
    NSCalendarDate *reset = [NSCalendarDate dateWithTimeIntervalSinceReferenceDate:[reset_session_timer_time timeIntervalSinceReferenceDate]];
    [reset setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
    reset = [NSCalendarDate dateWithYear:[today yearOfCommonEra]
                                   month:[today monthOfYear]
                                     day:[today dayOfMonth]
                                    hour:[reset hourOfDay]
                                  minute:[reset minuteOfHour]
                                  second:0
                                timeZone:systemZone];
    if ([today compare:reset] != NSOrderedAscending)
        reset = [reset dateByAddingYears:0 months:0 days:1 hours:0 minutes:0 seconds:0];
    reset_session_date = [reset timeIntervalSinceReferenceDate];
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context;
{
    if ([keyPath isEqualToString:@"values.reset_session_timer_time"])
        [self computeResetSessionDate];
}

// tick every second and update status
- (void)tick:(NSTimer *)timer
{
	// calculate time since last tick
	NSTimeInterval new_date = [NSDate timeIntervalSinceReferenceDate];
	NSTimeInterval tick_time = new_date - date;
	date = new_date;

    if (reset_session_timer_daily && date >= reset_session_date) {
        [self resetSession:nil];
        [self computeResetSessionDate];
        return;
    }
    
	// check if we are still on track of normal time, otherwise we might have slept or something
	if (tick_time > work_break_duration) {
		// set timers to 0
		micro_pause_t = 0;
		work_break_t = 0;
		micro_pause_taking_t = micro_pause_duration;
		work_break_taking_t = work_break_duration;
		if (s_normal != state) {
			[self endBreak];
		}
		// and do stuff on next tick
		return;
	}
	
	// just did a whole micropause beyond normal time
	if (tick_time > micro_pause_duration && s_taking_work_break != state) {
		// set micro_pause timers to 0
		micro_pause_t = 0;
		micro_pause_taking_t = micro_pause_duration;
		if (s_normal != state) {
			[self endBreak];
		}
		// and do stuff on next tick
		return;
	}
	
	// get idle time in seconds
	CFTimeInterval idle_time = CGSSecondsSinceLastInputEvent(kCGAnyInputEventType);
    // CFTimeInterval cgs_idle_time = idle_time;
    // from other people's reverse engineering of this function, on MDD G4s this can return a large positive number when input is in progress
    if (idle_time >= 18446744000.0) {
        idle_time = 0;
    } else if (CGEventSourceSecondsSinceLastEventType != NULL) {
		CGEventType eventTypes[] = { kCGEventLeftMouseDown, kCGEventLeftMouseUp, kCGEventRightMouseDown, kCGEventRightMouseUp, kCGEventMouseMoved, kCGEventLeftMouseDragged, kCGEventRightMouseDragged, kCGEventKeyDown, kCGEventKeyUp, kCGEventFlagsChanged, kCGEventScrollWheel, kCGEventTabletPointer, kCGEventTabletProximity, kCGEventOtherMouseDown, kCGEventOtherMouseUp, kCGEventOtherMouseDragged, kCGEventNull };
        CFTimeInterval event_idle_time;
        idle_time = DBL_MAX;
        for (CGEventType *eventType = eventTypes ; *eventType != kCGEventNull ; eventType++) {
            event_idle_time = CGEventSourceSecondsSinceLastEventType(kCGEventSourceStateCombinedSessionState, *eventType);
            if (event_idle_time < idle_time) idle_time = event_idle_time;
        }
    }
    // NSLog(@"CGEventSource %.2f, CGS %.2f", idle_time, cgs_idle_time);
    
    if (reset_session_timer_after && idle_time > reset_session_timer_after_hours * 3600) {
        [self resetSession:nil];
        return;
    }
    
	// calculate slack, this gives a sort of 3 history filtered idea.
	BOOL slack = (h2 + h1 + h0 > 15);
	
	// if new event comes in history bumps up
	if (h0 >= idle_time || idle_time < sample_interval) {
		h2 = h1;
		h1 = h0;
	}
	h0 = idle_time;
	
	switch (state) {
		case s_normal:
			// idle_time needs to be at least 0.3 * micro_pause_duration before kicking in
			// but we cut the user some slack based on previous idle_times
			if (idle_time <= micro_pause_duration * 0.3 && !slack) {
				micro_pause_t += tick_time;
				work_break_t += tick_time;
                if (idle_time < 1) {
                    session_t += tick_time;
                }
				micro_pause_taking_t = 0;
				if (work_break_taking_t > 0) {
					work_break_taking_cached_t = work_break_taking_t;
					work_break_taking_cached_date = date;
				}
				work_break_taking_t = 0;
			} else if (micro_pause_t > 0) {
			// oke, leaway is over, increase micro_pause_taking_t unless micro_pause is already over
				//micro_pause_t stays put
				work_break_t += tick_time;
				micro_pause_taking_t += tick_time;
				work_break_taking_t = 0;
			}
			
			// if micro_pause_taking_t is above micro_pause_duration, then micro pause is over, 
			// if still idleing workbreak_taking_t kicks in unless it is already over
			if (micro_pause_taking_t >= micro_pause_duration && work_break_t > 0) {
				work_break_taking_t += tick_time;
				micro_pause_t = 0;
			}
			
			// if work_break_taking_t is above work_break_duration, then work break is over
			if (work_break_taking_t >= work_break_duration) {
				micro_pause_t = 0;
				work_break_t = 0;
				// micro_pause_taking_t stays put
				// work_break_taking_t stays put
			}
		
			// if user needs to take a micro pause
			if (micro_pause_t >= micro_pause_period) {
				// anticipate next workbreak by not issuing this micro_pause ...
				if (work_break_t > work_break_period - (micro_pause_period / 2)) {
					work_break_t = work_break_period;
					[self doWorkBreak];
				} else {
					[self doMicroPause];
				}
			}
			
			// if user needs to take a work break
			if (work_break_t >= work_break_period) {
				// stop micro_pause stuff
				micro_pause_t = 0;
				micro_pause_taking_t = micro_pause_duration;
				// and display window
				[self doWorkBreak];
			}
		break;

		// taking a micro pause with window
		case s_taking_micro_pause:
			// continue updating timers
			micro_pause_taking_t += tick_time;
			work_break_t += tick_time;
			
			// if we don't break, or interrupt the break, reset it
			if (idle_time < 1 && !slack) {
				micro_pause_taking_t = 0;
                session_t += tick_time;
			}
				
			// update window
            [self updateBreakWindowDuration:micro_pause_duration progress:micro_pause_taking_t
                                  nextBreak:work_break_period - work_break_t];

			// check if we done enough
			if (micro_pause_taking_t > micro_pause_duration) {
				micro_pause_t = 0;
				[self endBreak];
			}
		
			// if workbreak must be run ...
			if (work_break_t >= work_break_period) {
				// stop micro_pause stuff
				micro_pause_t = 0;
				micro_pause_taking_t = micro_pause_duration;
				// and display window
				[self doWorkBreak];
			} else {
                double slip = (micro_pause_duration - micro_pause_taking_t) - (int)(micro_pause_duration - micro_pause_taking_t);
                [self installTimer: slip < 0.1 ? 1 : slip];
            }
			break;
		
		// taking a work break with window
		case s_taking_work_break:
			// increase work_break_taking_t
			if (idle_time >= 2 || work_break_taking_t < 3) {
				work_break_taking_t += tick_time;
			} else if (idle_time < 1) {
                session_t += tick_time;
            }
			
			// draw window
            [self updateBreakWindowDuration:work_break_duration progress:work_break_taking_t
                                  nextBreak:work_break_period + work_break_duration - work_break_taking_t];

			// and check if we done enough
			if (work_break_taking_t > work_break_duration) {
				micro_pause_t = 0;
				micro_pause_taking_t = micro_pause_duration;
				work_break_t = 0;
				work_break_taking_t = work_break_duration;
				[self endBreak];
			} else {
                double slip = (work_break_duration - work_break_taking_t) - (int)(work_break_duration - work_break_taking_t);
                [self installTimer: slip < 0.1 ? 1 : slip];
            }
			break;
	}
	
	// draw dock image
	if (draw_dock_image) [self drawDockImage];
}

// dock image
- (NSMenu *)applicationDockMenu:(NSApplication *)sender;
{
    [session_time_item setTitle:[self sessionTimeString]];
    return dock_menu;
}

// draw the dock icon
- (void)drawDockImage
{
	[dock_image lockFocus];
	
	// clear all
	[[NSColor clearColor] set];  
	NSRectFill(NSMakeRect(0,0,127,127));
	
	NSBezierPath* p;
	float end;
	
	//draw background circle
	[darkbackground set];
	p =[NSBezierPath bezierPathWithOvalInRect:NSMakeRect(6,6,115,115)];
	[p setLineWidth:4];
	[p stroke];
	
	//fill
	[background set];
	[[NSBezierPath bezierPathWithOvalInRect:NSMakeRect(8,8,111,111)] fill];
	
	//put dot in middle
	[darkbackground set];
	[[NSBezierPath bezierPathWithOvalInRect:NSMakeRect(59,59,9,9)] fill];

	// reuse this one
	p = [NSBezierPath bezierPath];

	// draw work_break
	[elapsed set];
	end = 360 - (360.0 / work_break_period * work_break_t - 90);
	if (end <= 90) end=90.1;
	[p appendBezierPathWithArcWithCenter:NSMakePoint(63.5, 63.5) radius:40 startAngle:90 endAngle:end clockwise:YES];
	[p setLineWidth:22];
	[p stroke];
	
	// draw work break taking
	[taking set];
	[p removeAllPoints];
	end = 360 - (360.0 / work_break_duration * work_break_taking_t - 90);
	if (end <= 90) end=90.1;
	[p appendBezierPathWithArcWithCenter:NSMakePoint(63.5, 63.5) radius:40 startAngle:90 endAngle:end clockwise:YES];
	[p setLineWidth:18];
	[p stroke];
	
	// draw micro pause
	[elapsed set];
	[p removeAllPoints];
	end = 360 - (360.0 / micro_pause_period * micro_pause_t - 90);
	if (end <= 90) end = 90.1;
	[p appendBezierPathWithArcWithCenter:NSMakePoint(63.5, 63.5) radius:17 startAngle:90 endAngle:end clockwise:YES];
	[p setLineWidth:22];
	[p stroke];
	
	// draw micro pause taking
	[taking set];
	[p removeAllPoints];
	end = 360 - (360.0 / micro_pause_duration * micro_pause_taking_t - 90);
	if (end <= 90) end = 90.1;
	[p appendBezierPathWithArcWithCenter:NSMakePoint(63.5, 63.5) radius:17 startAngle:90 endAngle:end clockwise:YES];
	[p setLineWidth:18];
	[p stroke];
	
    // draw session time
    if (draw_dock_badge) {
        static NSImage *badge = nil;
        static int badge_session_minutes = -1;
        int session_minutes = (int)session_t / 60;
        if (badge_session_minutes != session_minutes) {
            if (badge != nil) [badge release];
            badge = [[dock_badge badgeOverlayImageForString: [NSString stringWithFormat:@"%d:%02d", session_minutes / 60, session_minutes % 60] insetX: 3 y: 3] retain];
            badge_session_minutes = session_minutes;
        }
        [badge compositeToPoint:NSZeroPoint operation:NSCompositeSourceOver];
    }
    
	[dock_image unlockFocus];

	// and set it in the dock check draw_dock_image one last time ...
	if (draw_dock_image_q) [NSApp setApplicationIconImage:dock_image];
}

// done with micro pause or work break
- (void)endBreak
{
	[main_window orderOut:NULL];
	state = s_normal;
	// reset time interval to user's choice
	[self installTimer:sample_interval];
}

// display micro_pause window with appropriate widgets and progress bar
- (void)doMicroPause
{
	micro_pause_taking_t = 0;
	[status setStringValue:@"Micro Pause"];
	[progress setMaxValue:micro_pause_duration];
	[progress setDoubleValue:micro_pause_taking_t];
    [progress setWarningValue: 1];
    [progress setCriticalValue: micro_pause_duration];
	[postpone setHidden:YES];
	state = s_taking_micro_pause;
	[self tick: nil];
	[main_window center];
	[main_window orderFrontRegardless];
}

// display work_break window with appropriate widgets and progress bar
- (void)doWorkBreak
{
	work_break_taking_t = 0;
	// incase you were already having an implicit work break and clicked the take work break now button
	// not more then 20 seconds ago we took a natural break longer then 0.2 * normal work break duration 
	if (date - work_break_taking_cached_date < 20 && work_break_taking_cached_t > work_break_duration * 0.2) {
		work_break_taking_t = work_break_taking_cached_t;
	} 
	[status setStringValue:@"Work Break"];
	[progress setMaxValue:work_break_duration / 60];
	[progress setDoubleValue:work_break_taking_t / 60 - 0.5];
    [progress setWarningValue: 0];
    [progress setCriticalValue: 0.4];
	[postpone setHidden:NO];
	state = s_taking_work_break;
    [self tick: nil];
	[main_window center];
	[main_window orderFrontRegardless];
}

- (NSString *)sessionTimeString;
{
    return [NSString stringWithFormat:@"Session: %d:%02d:%02d", (int)session_t / 3600,
        ((int)session_t / 60) % 60, lrint(session_t) % 60];
}

- (void)updateBreakWindowDuration:(double)duration progress:(double)progress_t nextBreak:(double)nextBreak;
{
    // progress
    [progress setDoubleValue:duration >= 60 ? (progress_t / 60 - 0.5) : progress_t];
    
    // time left
    double timeLeft = duration - progress_t;
	[time setStringValue:[NSString stringWithFormat:@"%d:%02d", (int)timeLeft / 60, lrint(timeLeft) % 60]];
    
    // cumulative typing time in this session (e.g. today)
    [session_time setStringValue:[self sessionTimeString]];
    
    // next break
	int minutes = round(nextBreak / 60.0);
	
	// nice hours, minutes ... 
	if (minutes > 60) {
		[next_break setStringValue:[NSString stringWithFormat:@"next break in %d:%02d hours", 
			minutes / 60, minutes % 60]];
	} else {
		[next_break setStringValue:[NSString stringWithFormat:@"next break in %d minutes", minutes]];
	}

    // if user likes to be interrupted
    if (lock_focus) {
        [NSApp activateIgnoringOtherApps:YES];
        [main_window makeKeyAndOrderFront:self];
    }
}

// goto website
- (IBAction)gotoWebsite:(id)sender
{
	[[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:sURL]];
}

// check for update
- (IBAction)checkForUpdate:(id)sender
{
	NSString *latest_version =
	[NSString stringWithContentsOfURL: [NSURL URLWithString:sLatestVersionURL]];
	
	if (latest_version == Nil) latest_version = @"";
	latest_version = [latest_version stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
	
	if ([latest_version length] == 0) {
		NSRunInformationalAlertPanel(
			@"Unable to Determine",
			@"Unable to determine the latest AntiRSI version number.",
			@"Ok", nil, nil);
	} else if ([latest_version compare:sVersion] == NSOrderedDescending) {
		int r = NSRunInformationalAlertPanel(
			@"New Version",
			[NSString stringWithFormat:@"A new version (%@) of AntiRSI is available; would you like to go to the website now?", latest_version],
			@"Goto Website", @"Cancel", nil);
		if (r == NSOKButton) {
			[[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:sURL]];
		}
    } else {
    	NSRunInformationalAlertPanel(
			@"No Update Available", 
			@"This is the latest version of AntiRSI.", 
			@"OK", nil, nil);
    }
}

// stop work break and postpone by 10 minutes
- (IBAction)postpone:(id)sender
{
	if (s_taking_work_break == state) {
		micro_pause_t = 0;
		micro_pause_taking_t = 0;
		work_break_taking_t = 0;
		work_break_taking_cached_t = 0;
		work_break_t -= 10*60; // decrease with 10 minutes
		if (work_break_t < 0) work_break_t = 0;
		[self endBreak];
	}
}

- (IBAction)breakNow:(id)sender
{
	[self doWorkBreak];
}

- (IBAction)resetSession:(id)sender;
{
    if (s_normal != state) {
        [self endBreak];
    }
    [self resetTimers];
}

// validate menu items
- (BOOL)validateMenuItem:(NSMenuItem *)anItem
{
	if ([anItem action] == @selector(breakNow:) && state == s_normal)
		return YES;
	
	if ([anItem action] == @selector(postpone:) && state == s_taking_work_break)
		return YES;

    if ([anItem action] == @selector(resetSession:))
		return YES;

	if ([anItem action] == @selector(gotoWebsite:))
		return YES;

    if ([anItem action] == @selector(checkForUpdate:))
		return YES;

	return NO;
}

// we are delegate of NSApplication, so we can restore the icon on quit.
- (void)applicationWillTerminate:(NSNotification *)aNotification
{
	// make sure timer doesn't tick once more ...
	draw_dock_image_q = NO;
	[mtimer invalidate];
	[mtimer autorelease];
	mtimer = nil;
	[dock_image release];
	// stupid fix for icon beeing restored ... it is not my fault,
	// the dock or NSImage or setApplicationIconImage seem to be caching or taking
	// snapshot or something ... !
	[NSApp setApplicationIconImage:original_dock_image];
	[NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.1]];
	[NSApp setApplicationIconImage:original_dock_image];

}

@end

