/*

 Copyright (C) 2014 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 */

#import "AAPLImage.h"

@interface AAPLImage ()

- (instancetype) initWithRecord:(CKRecord *)record isOnServer:(BOOL)onServer;

@end

#pragma mark -

@implementation AAPLImage

// Designated initializer

- (instancetype) initWithRecord:(CKRecord *)record isOnServer:(BOOL)onServer

{

    NSAssert([[record recordType] isEqual:AAPLImageRecordType], @"Wrong type for image record");

    self = [super init];

    if (self != nil)

    {

        _onServer = onServer;

        _record = record;

        // Loads thumbnail

        NSURL *thumbFileURL = [_record[AAPLImageThumbnailKey] fileURL];

        NSData *thumbImageData = [NSData dataWithContentsOfURL:thumbFileURL];

        _thumbnail = [[UIImage alloc] initWithData:thumbImageData];

        // Loads full size

        NSURL *fullFileURL = [_record[AAPLImageFullsizeKey] fileURL];

        NSData *fullImageData = [NSData dataWithContentsOfURL:fullFileURL];

        _fullImage = [[UIImage alloc] initWithData:fullImageData];

    }

    return self;

}

// Creates an AAPLImage from a UIImage (photo was taken from camera or photo library)

- (instancetype) initWithImage:(UIImage *)image

{    

    CGImageRef CGRawImage = image.CGImage;

    CGImageRef cropped = NULL;

    if(CGImageGetHeight(CGRawImage) > CGImageGetWidth(CGRawImage))

    {

        // Crops from top and bottom evenly

        size_t maxDimen = CGImageGetWidth(CGRawImage);

        size_t offset = (CGImageGetHeight(CGRawImage) - CGImageGetWidth(CGRawImage)) / 2;

        cropped = CGImageCreateWithImageInRect(image.CGImage, CGRectMake(0, offset, maxDimen, maxDimen));

    }

    else if(CGImageGetHeight(CGRawImage) <= CGImageGetWidth(CGRawImage))

    {

        // Crops from left and right evenly

        size_t maxDimen = CGImageGetHeight(CGRawImage);

        size_t offset = (CGImageGetWidth(CGRawImage) - CGImageGetHeight(CGRawImage)) / 2;

        cropped = CGImageCreateWithImageInRect(image.CGImage, CGRectMake(offset, 0, maxDimen, maxDimen));

    }

    // Resizes image to be 1500 x 1500 px and saves it to a temporary file

    UIGraphicsBeginImageContext(CGSizeMake(1500, 1500));

    [[UIImage imageWithCGImage:cropped scale:image.scale orientation:image.imageOrientation] drawInRect:CGRectMake(0,0,1500,1500)];

    UIImage *fullImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    NSString *path = [NSTemporaryDirectory() stringByAppendingString:@"toUploadFull.tmp"];

    NSData *imageData = UIImageJPEGRepresentation(fullImage,0.5);

    [imageData writeToFile:path atomically:YES];

    NSURL *fullURL = [NSURL fileURLWithPath:path];

    // Resizes thumbnail to be 200 x 200 px and then saves to different temp file

    UIGraphicsBeginImageContext(CGSizeMake(200, 200));

    [[UIImage imageWithCGImage:cropped scale:image.scale orientation:image.imageOrientation] drawInRect:CGRectMake(0,0,200,200)];

    UIImage *thumbImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    path = [NSTemporaryDirectory() stringByAppendingString:@"toUploadThumb.tmp"];

    imageData = UIImageJPEGRepresentation(thumbImage,0.5);

    [imageData writeToFile:path atomically:YES];

    NSURL *thumbURL = [NSURL fileURLWithPath:path];

    // Cleans up memory that ARC won't touch

    CGImageRelease(cropped);

    // Creates Image record type with two assets, full sized image and thumbnail sized image

    CKRecord *newImageRecord = [[CKRecord alloc] initWithRecordType:AAPLImageRecordType];

    newImageRecord[AAPLImageFullsizeKey] = [[CKAsset alloc] initWithFileURL:fullURL];

    newImageRecord[AAPLImageThumbnailKey] = [[CKAsset alloc] initWithFileURL:thumbURL];

    // Calls designated initalizer, this is a new image so it is not on the server

    return [self initWithRecord:newImageRecord isOnServer:NO];

}

// Creates an AAPLImage from a CKRecord that has been fetched

- (instancetype) initWithRecord:(CKRecord *)record

{

    return [self initWithRecord:record isOnServer:YES];

}

@end