/*

     File: Controller.m

 Abstract: Controller for the Cache demo. On launch it creates the  folder of default demo images and opens it.  The creation of the demo images involves some NSBitmapImageRep usage, using a single image as the template and creating copies labelled with an incrementing number to differentiate them. The Controller also implements open: to enable opening any folder.

  Version: 1.0

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 */

#import "Controller.h"

#import "Images.h"

@implementation Controller

/* This method returns the folder where the standard demo images are stored. Although this may be a folder in the app bundle, in interest of keeping the sample code distribution small, we just ship one image which is replicated in a temporary location. The temporary folder is kept around and will be reused by further runs of the app by the same user during the same boot session. 

This method will return nil if the standard demo folder cannot be found and cannot be recreated.

One interesting part of the method is the way in which it reads the demo image, and creates additional ones. 

*/

- (NSString *)standardDemoImageFolder {

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSString *demoImageFolder = [NSTemporaryDirectory() stringByAppendingPathComponent:@"com.apple.examples.Cache.DemoImages"];

    BOOL isDir;

    if ([fileManager fileExistsAtPath:demoImageFolder isDirectory:&isDir] && isDir) return demoImageFolder; // Use existing folder as-is

    if (![fileManager createDirectoryAtPath:demoImageFolder withIntermediateDirectories:YES attributes:nil error:NULL]) return nil;

    // At this point we created the demo image folder, so now create the demo images

    // First load the "template" demo image as an NSBitmapImageRep

    NSURL *demoImageURL = [[NSBundle mainBundle] URLForResource:@"DemoImage" withExtension:@"jpg"];

    NSBitmapImageRep *demoImage = demoImageURL ? [NSBitmapImageRep imageRepWithContentsOfURL:demoImageURL] : nil;

    if (!demoImage) return nil;

    NSSize pixelSize = NSMakeSize([demoImage pixelsWide], [demoImage pixelsHigh]);

    // Create a new NSBitmapImageRep for drawing in; make sure it has the same size, resolution, and colorspace as the original

    NSBitmapImageRep *updatedImage = [[[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL pixelsWide:pixelSize.width pixelsHigh:pixelSize.height bitsPerSample:8 samplesPerPixel:4 hasAlpha:YES isPlanar:NO colorSpaceName:NSCalibratedRGBColorSpace bytesPerRow:0 bitsPerPixel:0] autorelease];

    updatedImage = [updatedImage bitmapImageRepByRetaggingWithColorSpace:[demoImage colorSpace]];

    [updatedImage setSize:[demoImage size]];

    // Now "focus" on the new NSBitmapImageRep to we can draw on it. Note that although we create many images, we just reuse the same scratch NSBitmapImageRep

    NSGraphicsContext *savedContext = [NSGraphicsContext currentContext];

    [NSGraphicsContext setCurrentContext:[NSGraphicsContext graphicsContextWithBitmapImageRep:updatedImage]];

    // Text attributes to use

    NSDictionary *textAttributes = [NSDictionary dictionaryWithObjectsAndKeys:[NSFont systemFontOfSize:120.0], NSFontAttributeName, [NSColor whiteColor], NSForegroundColorAttributeName, nil];

    BOOL success = YES;

#define DemoImageCount 80

    NSInteger cnt = 0;

    while (success && cnt < DemoImageCount) {

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    // Draw the template image

        [demoImage draw];

    // And then the current image number

    [[NSString stringWithFormat:@"%03ld", (long)cnt] drawAtPoint:NSMakePoint(10.0, 10.0) withAttributes:textAttributes];

    // Create a JPEG for it and save it out

    NSData *JPEGRep = [updatedImage representationUsingType:NSJPEGFileType properties:nil];

    if (JPEGRep) {

        NSURL *outputURL = [[NSURL fileURLWithPath:demoImageFolder isDirectory:YES] URLByAppendingPathComponent:[NSString stringWithFormat:@"Image%03ld.jpg", (long)cnt]];

        success = [JPEGRep writeToURL:outputURL options:0 error:NULL];

    }

    [pool drain];

    cnt++;

    }

    // Restore graphics context

    [NSGraphicsContext setCurrentContext:savedContext];

    return success ? demoImageFolder : nil;

}

/* If the app is launched by dragging an image folder to the app icon, use that as the source of demo images.

*/

- (BOOL)application:(NSApplication *)theApplication openFile:(NSString *)filename {

    BOOL isDirectory;

    if ([[NSFileManager defaultManager] fileExistsAtPath:filename isDirectory:&isDirectory] && isDirectory) {

        NSError *error;

        Images *demo = [[Images alloc] initWithContentsOfFolder:filename error:&error];

        if (demo) {

            [demo release];

        openedOne = YES;

            return YES;

        } else {

            [NSApp presentError:error];

            return NO;

        }

    } else {

        return NO;

    }

}

/* This method checks to see if the app was opened by opening a folder; if not, it goes ahead and opens the demo folder of images. (And if the demo folder fails to open, then it puts up an open panel.)

*/

- (void)applicationDidFinishLaunching:(NSNotification *)notification {

    if (!openedOne) {

    NSString *demoPath = [self standardDemoImageFolder];

    if (demoPath) {

        [self application:NSApp openFile:demoPath];

    } else {

        [self open:nil];

    }

    }

}

- (IBAction)open:(id)sender {

    NSOpenPanel *openPanel = [NSOpenPanel openPanel];

    [openPanel setCanChooseFiles:NO];

    [openPanel setCanChooseDirectories:YES];

    [openPanel setAllowedFileTypes:[NSArray arrayWithObject:(NSString *)kUTTypeDirectory]];

    if ([openPanel runModal] == NSOKButton) {

        NSURL *url = [openPanel URL];

        if ([url isFileURL]) {

            NSString *path = [url path];

            if (path) {

                [self application:NSApp openFile:path];

            } else {

                NSBeep();

            }

        }

    }

}

@end