/*

     File: NotesDocument.m

 Abstract: Class representing our document format.

  Version: 1.0

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 */

#import "NotesDocument.h"

#import "Note.h"

NSString *kFileExtension = @"notes";    // our document's extension

// the text wrapper

static NSString *TextFileName = @"Text.txt";

static NSStringEncoding TextFileEncoding = NSUTF8StringEncoding;

// the image wrapper

static NSString *ImageFileName = @"Image.png";

@interface NotesDocument ()

@property (nonatomic, strong) NSFileWrapper *textFileWrapper;

@property (nonatomic, strong) NSFileWrapper *imageFileWrapper;

@end

#pragma mark -

@implementation NotesDocument

// read contents

- (BOOL)loadFromContents:(id)contents ofType:(NSString *)typeName error:(NSError **)outError

{

    _note = [[Note alloc] init];

    NSFileWrapper *fileWrapper = (NSFileWrapper *)contents;

    self.textFileWrapper = [[fileWrapper fileWrappers] objectForKey:TextFileName];

    NSData *textData = [self.textFileWrapper regularFileContents];

    self.note.notes = [[NSString alloc] initWithData:textData encoding:TextFileEncoding];

    self.imageFileWrapper = [[fileWrapper fileWrappers] objectForKey:ImageFileName];

    NSData *imageData = [self.imageFileWrapper regularFileContents];

    self.note.image = [UIImage imageWithData:imageData];

    return YES;

}

// save contents

- (id)contentsForType:(NSString *)typeName error:(NSError **)outError

{

    NSFileWrapper *contentsFileWrapper = [[NSFileWrapper alloc] initDirectoryWithFileWrappers:nil];

    // write out the note text

    NSData *textData = [self.note.notes dataUsingEncoding:TextFileEncoding];

    self.textFileWrapper = [[NSFileWrapper alloc] initRegularFileWithContents:textData];

    [self.textFileWrapper setPreferredFilename:TextFileName];

    [contentsFileWrapper addFileWrapper:self.textFileWrapper];

    // write out the image data

    NSData *imageData = UIImagePNGRepresentation(self.note.image);

    self.imageFileWrapper = [[NSFileWrapper alloc] initRegularFileWithContents:imageData];

    [self.imageFileWrapper setPreferredFilename:ImageFileName];

    [contentsFileWrapper addFileWrapper:self.imageFileWrapper];

    return contentsFileWrapper;

}

@end