/*

 File: ICTakePictureHandler.m

 Abstract: ICTakePictureHandler 

 Version: 1.0

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 */ 

#import "ICTakePictureHandler.h"

static ICTakePictureHandler * gICTakePictureHandler = NULL;

@implementation ICTakePictureHandler

// ---------------------------------------------------------------------------------------------------------------------

+ (ICTakePictureHandler*)sharedTakePictureHandler

{

    // return global gICTakePictureHandler...

    if (NULL == gICTakePictureHandler)

    {

        gICTakePictureHandler = [[ICTakePictureHandler alloc] init];

    }

    return gICTakePictureHandler;

}

// ---------------------------------------------------------------------------------------------------------------------

static void TakePictureNotificationCallback(ICAHeader* pbPtr)

{

    // TakePictureNotificationCallback gets called when there's an Image Capture event notification

    ICTakePictureHandler * handler = (ICTakePictureHandler*)pbPtr->refcon;

    if (handler)

        [handler takePictureNotification: (ICAExtendedRegisterEventNotificationPB*)pbPtr];

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)showUI: (ICAObject)deviceObject

{

    // load the nib

    if (NULL == mWindow)

    {

        [NSBundle loadNibNamed: @"TakePicture"

                         owner: self];

    }

    // save the device object - we need it for the take picture...

    mDeviceObject = deviceObject;

    // "full screen"

    NSRect screenRect = [[NSScreen mainScreen] visibleFrame];

    [mWindow setFrame: screenRect

              display: NO];

    [mWindow makeKeyAndOrderFront: self];

    // register for notifications...

    OSErr err;

    ICARegisterEventNotificationPB pb = {};

    pb.header.refcon = (UInt32)self;                    // set the refcon so we can dispatch back to 'self'

    pb.notifyProc    = TakePictureNotificationCallback; // global callback proc

    pb.object        = 0;                               // 0 = all objects

    pb.notifyType    = 0;                               // 0 = all types

    err = ICARegisterEventNotification(&pb, NULL);

    // ... error handling ...

}

// ---------------------------------------------------------------------------------------------------------------------

static void ICIgnore(ICAHeader* pbPtr)

{

}

// ---------------------------------------------------------------------------------------------------------------------

- (IBAction)takePicture: (id)sender

{

    ICAObjectSendMessagePB  pb = {};

    OSErr                   err;

    // send the take picture command

    pb.header.refcon        = (UInt32)self;

    // ... to the device object

    pb.object               = mDeviceObject;

    // messageType is kICAMessageCameraCaptureNewImage

    pb.message.messageType  = kICAMessageCameraCaptureNewImage;

    // asynchronous call - ICIgnore will get called when call completes

    err = ICAObjectSendMessage(&pb, ICIgnore);

}

// ---------------------------------------------------------------------------------------------------------------------

- (IBAction)closeWindow: (id)sender

{

    // un-register for notifications...

    OSErr err;

    ICARegisterEventNotificationPB pb = {};

    pb.header.refcon = (UInt32)self;                    // set the refcon so we can dispatch back to 'self'

    pb.notifyProc    = NULL;                            // NULL = unregister

    pb.object        = 0;                               // 0 = all objects

    pb.notifyType    = 0;                               // 0 = all types

    err = ICARegisterEventNotification(&pb, NULL);

    // close the window

    [mWindow close];

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)takePictureNotification: (ICAExtendedRegisterEventNotificationPB*)pbPtr

{

    if (kExtendedNotificationPB == pbPtr->extd)

    {

        switch (pbPtr->eventType)

        {

            case kICAEventDeviceRemoved:                    // device removed : if it's our mDeviceObject - close window

                if (pbPtr->deviceObject == mDeviceObject)

                {

                    [self closeWindow: self];

                }

                break;

            case kICAEventObjectAdded:                      // picture was takenn & saved, download it...

                [self downloadObject: pbPtr->object];

                break;

            default:

                break;

        }

    }

}

// ---------------------------------------------------------------------------------------------------------------------

static void ICADownloadFileCallback (ICAHeader* pbHeader)

{

    // we use the refcon to get back to the ICAHandler

    ICTakePictureHandler * obj = (ICTakePictureHandler*)pbHeader->refcon;

    if (obj)

        [obj downloadFileCallback: (ICADownloadFilePB*) pbHeader];

}

// ---------------------------------------------------------------------------------------------------------------------

- (void) downloadFileCallback: (ICADownloadFilePB*)pbPtr

{

    if (noErr != pbPtr->header.err)

    {

        // handle error

    } else

    {

        UInt8 * path[512];

        OSErr   err = FSRefMakePath(&mDownloadedFile, (UInt8 *)path, 512);

        if (noErr != err)

        {

            // ... error handling ...

        } else

        {

            // image was downloaded - create a new image and update the UI

            NSString * fileName  = [NSString stringWithUTF8String: (const char *)path];

            NSImage *  image = [[NSImage alloc] initWithContentsOfFile: fileName];

            [mImageView setImage: image];

            [image release];

        }

    }

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)downloadObject: (ICAObject)object

{

    OSErr               err;

    ICADownloadFilePB   pb = {};

    FSRef               tmpFolder;

    // create a FSRef for the downlaod folder - in this case it's /tmp

    FSPathMakeRef((const UInt8 *)"/tmp/", &tmpFolder, NULL);

    pb.header.refcon = (UInt32)self;

    pb.object        = object;

    // as flags: delete after download - we don't want to fill up the memory card...

    pb.flags         = kDeleteAfterDownload;

    pb.dirFSRef      =  &tmpFolder;

    // pass mDownloadedFile - that way we'll get the actual filename (Image Capture may add a ' 1' or ' 2' if there's 

    // a file naming conflict

    pb.fileFSRef     = &mDownloadedFile;

    // asynchronous call - callback proc will get called when call completes

    err = ICADownloadFile(&pb, ICADownloadFileCallback);

    if (noErr != err)

    {

        // handle error

    }

}

@end