/*

        File: main.m

    Abstract: Main file.

     Version: 1.2

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

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    In consideration of your agreement to abide by the following terms, and

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    "Apple Software"), to use, reproduce, modify and redistribute the Apple

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    provided that if you redistribute the Apple Software in its entirety and

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    be used to endorse or promote products derived from the Apple Software

    without specific prior written permission from Apple.  Except as

    expressly stated in this notice, no other rights or licenses, express or

    implied, are granted by Apple herein, including but not limited to any

    patent rights that may be infringed by your derivative works or by other

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    The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

    MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

    THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

    FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

    OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

    IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

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    Copyright (C) 2009 Apple Inc. All Rights Reserved.

*/

#import <Cocoa/Cocoa.h>

#import <Quartz/Quartz.h>

#define kSlideShowInterval          3.0

@interface SlideShowApplication : NSApplication <NSApplicationDelegate>

{

@private

    NSMutableArray*             _fileList;

    NSOpenGLContext*            _openGLContext;

    QCRenderer*                 _renderer;

}

@end

@implementation SlideShowApplication

- (id) init

{

    //We need to be our own delegate

    if(self = [super init])

    [self setDelegate:self];

    return self;

}

- (void) applicationDidFinishLaunching:(NSNotification*)aNotification 

{

    NSArray*                        imageFileTypes = [NSImage imageFileTypes];

    GLint                           value = 1;

    NSOpenGLPixelFormatAttribute    attributes[] = {

                                                        NSOpenGLPFAFullScreen,

                                                        NSOpenGLPFAScreenMask, CGDisplayIDToOpenGLDisplayMask(kCGDirectMainDisplay),

                                                        NSOpenGLPFANoRecovery,

                                                        NSOpenGLPFADoubleBuffer,

                                                        NSOpenGLPFAAccelerated,

                                                        NSOpenGLPFADepthSize, 24,

                                                        (NSOpenGLPixelFormatAttribute) 0

                                                    };

    NSOpenGLPixelFormat*            format = [[[NSOpenGLPixelFormat alloc] initWithAttributes:attributes] autorelease];

    NSOpenPanel*                    openPanel;

    NSDirectoryEnumerator*          enumerator;

    NSString*                       basePath;

    NSString*                       subPath;

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5

    QCComposition*                  composition;

    NSArray*                        compositions;

    CGColorSpaceRef                 colorSpace;

#endif

    //Ask the user for a directory of images

    openPanel = [NSOpenPanel openPanel];

    [openPanel setAllowsMultipleSelection:NO];

    [openPanel setCanChooseDirectories:YES];

    [openPanel setCanChooseFiles:NO];

    if([openPanel runModalForDirectory:nil file:nil types:nil] != NSOKButton) {

        NSLog(@"No directory specified");

        [NSApp terminate:nil];

    }

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5

    //Pick up a random transition composition from the repository

    compositions = [[QCCompositionRepository sharedCompositionRepository] compositionsWithProtocols:[NSArray arrayWithObject:QCCompositionProtocolGraphicTransition] andAttributes:nil];

    if(![compositions count]) {

        NSLog(@"No transition compositions available");

        [NSApp terminate:nil];

    }

    composition = [compositions objectAtIndex:(random() % [compositions count])];

#endif

    //Populate an array with all the image files in the directory (no recursivity)

    _fileList = [NSMutableArray new];

    basePath = [[openPanel filenames] objectAtIndex:0];

    enumerator = [[NSFileManager defaultManager] enumeratorAtPath:basePath];

    while(subPath = [enumerator nextObject]) {

        if([[[enumerator fileAttributes] objectForKey:NSFileType] isEqualToString:NSFileTypeDirectory]) {

            [enumerator skipDescendents];

            continue;

        }

        if([imageFileTypes containsObject:[subPath pathExtension]])

        [_fileList addObject:[basePath stringByAppendingPathComponent:subPath]];

    }

    if([_fileList count] < 2) {

        NSLog(@"The directory contain less than 2 image files");

        [NSApp terminate:nil];

    }

    //Capture the main screen

    CGDisplayCapture(kCGDirectMainDisplay);

    CGDisplayHideCursor(kCGDirectMainDisplay);

    //Create the fullscreen OpenGL context on the main screen (double-buffered with color and depth buffers)

    _openGLContext = [[NSOpenGLContext alloc] initWithFormat:format shareContext:nil];

    if(_openGLContext == nil) {

        NSLog(@"Cannot create OpenGL context");

        [NSApp terminate:nil];

    }

    [_openGLContext setFullScreen];

    [_openGLContext setValues:&value forParameter:kCGLCPSwapInterval];

    //Create the QuartzComposer Renderer with that OpenGL context and the transition composition file

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5

    colorSpace = CGDisplayCopyColorSpace(kCGDirectMainDisplay);

    _renderer = [[QCRenderer alloc] initWithCGLContext:[_openGLContext CGLContextObj] pixelFormat:[format CGLPixelFormatObj] colorSpace:colorSpace composition:composition];

    CGColorSpaceRelease(colorSpace);

#else

    _renderer = [[QCRenderer alloc] initWithOpenGLContext:_openGLContext pixelFormat:format file:[[NSBundle mainBundle] pathForResource:@"Transition" ofType:@"qtz"]];

#endif

    if(_renderer == nil) {

        NSLog(@"Cannot create QCRenderer");

        [NSApp terminate:nil];

    }

    //Run first transition ASAP

    [self performSelector:@selector(_performTransition:) withObject:nil afterDelay:0.0];

}

- (void) _performTransition:(id)param

{

    double                  time;

    NSImage*                image;

    //Load the next image

    image = [[NSImage alloc] initWithData:[NSData dataWithContentsOfFile:[_fileList objectAtIndex:0]]];

    if(image == nil)

    NSLog(@"Cannot load image file at path: %@", [_fileList objectAtIndex:0]);

    [_fileList removeObjectAtIndex:0];

    //Set transition source image (just get it from the previous destination image)

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5

    [_renderer setValue:[_renderer valueForInputKey:QCCompositionInputDestinationImageKey] forInputKey:QCCompositionInputSourceImageKey];

#else

    [_renderer setValue:[_renderer valueForInputKey:@"destination"] forInputKey:@"source"];

#endif

    //Set transition destination image (the new image)

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5

    [_renderer setValue:image forInputKey:QCCompositionInputDestinationImageKey];

#else

    [_renderer setValue:image forInputKey:@"destination"];

#endif

    //Release next image

    [image release];

    //Render transition - FIXME: do that from a runloop timer to avoid blocking the application and have accurate timing

    for(time = 0.0; time < 1.0; time += 0.01) {

        if(![_renderer renderAtTime:time arguments:nil])

        NSLog(@"Rendering failed at time %.3fs", time);

        [_openGLContext flushBuffer];

    }

    if(![_renderer renderAtTime:1.0 arguments:nil]) //This is necessary to make sure the last image rendered is at time 1.0 exactly (otherwise, we might have visual garbage)

    NSLog(@"Rendering failed at time %.3fs", time);

    [_openGLContext flushBuffer];

    //Schedule next transition

    if([_fileList count])

    [self performSelector:@selector(_performTransition:) withObject:nil afterDelay:kSlideShowInterval];

}

- (void) sendEvent:(NSEvent*)event

{

    //If the user pressed the [Esc] key, we need to exit

    if(([event type] == NSKeyDown) && ([event keyCode] == 0x35))

    [NSApp terminate:nil];

    [super sendEvent:event];

}

- (void) applicationWillTerminate:(NSNotification*)aNotification 

{

    //Destroy the renderer

    [_renderer release];

    //Destroy the OpenGL context

    [_openGLContext clearDrawable];

    [_openGLContext release];

    //Release main screen

    if(CGDisplayIsCaptured(kCGDirectMainDisplay)) {

        CGDisplayShowCursor(kCGDirectMainDisplay);

        CGDisplayRelease(kCGDirectMainDisplay);

    }

    //Release file list

    [_fileList release];

}

@end

int main(int argc, const char *argv[])

{

    return NSApplicationMain(argc, argv);

}