/*

 * Copyright (C) 2009 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#import "WebWindowAnimation.h"

#import "WebKitSystemInterface.h"

#import <wtf/Assertions.h>

static const CGFloat slowMotionFactor = 10.;

static NSTimeInterval WebWindowAnimationDurationFromDuration(NSTimeInterval duration)

{

    return ([[NSApp currentEvent] modifierFlags] & NSShiftKeyMask) ? duration * slowMotionFactor : duration;        

}

static NSRect scaledRect(NSRect _initialFrame, NSRect _finalFrame, double factor)

{

    NSRect currentRect = _initialFrame;

    currentRect.origin.x += (NSMinX(_finalFrame) - NSMinX(_initialFrame)) * factor;

    currentRect.origin.y += (NSMinY(_finalFrame) - NSMinY(_initialFrame)) * factor;

    currentRect.size.width += (NSWidth(_finalFrame) - NSWidth(_initialFrame)) * factor;

    currentRect.size.height += (NSHeight(_finalFrame) - NSHeight(_initialFrame)) * factor;

    return currentRect;

}

static CGFloat squaredDistance(NSPoint point1, NSPoint point2)

{

    CGFloat deltaX = point1.x - point2.x;

    CGFloat deltaY = point1.y - point2.y;

    return deltaX * deltaX + deltaY * deltaY;

}

@implementation WebWindowScaleAnimation

- (id)init

{

    self = [super init];

    if (!self)

        return nil;

#ifndef BUILDING_ON_TIGER

    [self setAnimationBlockingMode:NSAnimationNonblockingThreaded];

#endif

    [self setFrameRate:60.];

    return self;

}

- (id)initWithHintedDuration:(NSTimeInterval)duration window:(NSWindow *)window initalFrame:(NSRect)initialFrame finalFrame:(NSRect)finalFrame

{

    self = [self init];

    if (!self)

        return nil;

    _hintedDuration = duration;

    _window = window;

    _initialFrame = initialFrame;

    _finalFrame = finalFrame;

    _realFrame = [window frame];

    return self;

}

- (void) dealloc

{

    [_subAnimation release];

    [super dealloc];

}

- (void)setDuration:(NSTimeInterval)duration

{

    [super setDuration:WebWindowAnimationDurationFromDuration(duration)];

}

- (void)setWindow:(NSWindow *)window

{

    _window = window;

}

- (float)currentValue

{

    return 0.5 - 0.5 * cos(M_PI * (1 - [self currentProgress]));

}

- (NSRect)currentFrame

{

    return scaledRect(_finalFrame, _initialFrame, [self currentValue]);

}

- (void)setCurrentProgress:(NSAnimationProgress)progress

{

    if (!_window)

        return;

    [super setCurrentProgress:progress];

    NSRect currentRect = [self currentFrame];

#ifndef BUILDING_ON_TIGER

    WKWindowSetScaledFrame(_window, currentRect, _realFrame);

#else

    [_window setFrame:currentRect display:YES];

#endif

    [_subAnimation setCurrentProgress:progress];

}

- (void)setSubAnimation:(NSAnimation *)animation

{

    id oldAnimation = _subAnimation;

    _subAnimation = [animation retain];

    [oldAnimation release];

}

- (NSTimeInterval)additionalDurationNeededToReachFinalFrame

{

    static const CGFloat maxAdditionalDuration = 1.0;

    static const CGFloat speedFactor = 0.0001;

    CGFloat maxDist = squaredDistance(_initialFrame.origin, _finalFrame.origin);

    CGFloat dist;

    dist = squaredDistance(NSMakePoint(NSMaxX(_initialFrame), NSMinY(_initialFrame)), NSMakePoint(NSMaxX(_finalFrame), NSMinY(_finalFrame)));

    if (dist > maxDist)

        maxDist = dist;

    dist = squaredDistance(NSMakePoint(NSMaxX(_initialFrame), NSMaxY(_initialFrame)), NSMakePoint(NSMaxX(_finalFrame), NSMaxY(_finalFrame)));

    if (dist > maxDist)

        maxDist = dist;

    dist = squaredDistance(NSMakePoint(NSMinX(_initialFrame), NSMinY(_initialFrame)), NSMakePoint(NSMinX(_finalFrame), NSMinY(_finalFrame)));

    if (dist > maxDist)

        maxDist = dist;

    return MIN(sqrt(maxDist) * speedFactor, maxAdditionalDuration);    

}

- (void)startAnimation

{

    // Compute extra time

    if (_hintedDuration)

        [self setDuration:_hintedDuration + [self additionalDurationNeededToReachFinalFrame]];

    [super startAnimation];

}

- (void)stopAnimation

{

    _window = nil;

    [super stopAnimation];

    [_subAnimation stopAnimation];

}

@end

@implementation WebWindowFadeAnimation

- (id)init

{

    self = [super init];

    if (!self)

        return nil;

#ifndef BUILDING_ON_TIGER

    [self setAnimationBlockingMode:NSAnimationNonblockingThreaded];

#endif

    [self setFrameRate:60];

    [self setAnimationCurve:NSAnimationEaseInOut];

    return self;

}

- (id)initWithDuration:(NSTimeInterval)duration window:(NSWindow *)window initialAlpha:(CGFloat)initialAlpha finalAlpha:(CGFloat)finalAlpha

{

    self = [self init];

    if (!self)

        return nil;    

    _window = window;

    _initialAlpha = initialAlpha;

    _finalAlpha = finalAlpha;

    return self;

}

- (void)setDuration:(NSTimeInterval)duration

{

    [super setDuration:WebWindowAnimationDurationFromDuration(duration)];

}

- (CGFloat)currentAlpha

{

    return MAX(0.0, MIN(1.0, _initialAlpha + [self currentValue] * (_finalAlpha - _initialAlpha)));

}

- (void)setCurrentProgress:(NSAnimationProgress)progress

{

    if (_isStopped)

        return;

    ASSERT(_window);

    [super setCurrentProgress:progress];

#ifndef BUILDING_ON_TIGER

    WKWindowSetAlpha(_window, [self currentAlpha]);

#else

    [_window setAlphaValue:[self currentAlpha]];

#endif

}

- (void)setWindow:(NSWindow*)window

{

    _window = window;

}

- (void)stopAnimation

{

    // This is relevant when we are a sub animation of a scale animation.

    // In this case we are hosted in the animated thread of the parent

    // and even after [super stopAnimation], the parent might call

    // setCurrrentProgress.

    _isStopped = YES;

    [super stopAnimation];

}

@end