#import "MyDocument.h"

/*
 -- MyDocument.h --
 #import <Cocoa/Cocoa.h>

 @interface MyDocument : NSDocument
 {
    IBOutlet NSTextField *textField;
    NSString *loadedStringValue;
 }

 - (IBAction)changeText:(id)sender;

 @end
*/

@implementation MyDocument

- (NSString *)windowNibName
{
    return @"MyDocument";
}

- (void)updateDocumentInterfaceIfNeeded
{
    // if textField outlet == nil, this is being called from readFromData: ofType: error:
    // if textField outlet != nil, this is being called from windowControllerDidLoadNib: OR readFromData: ofType: error: when reverting a document where windowControllerDidLoadNib: has already been called.
    // if loadedStringValue == nil, this is being called from windowControllerDidLoadNib: when creating a new document

    if (textField && loadedStringValue)
    {
        [textField setStringValue:loadedStringValue];

        [loadedStringValue release];
        loadedStringValue = nil;
    }
}

- (void)windowControllerDidLoadNib:(NSWindowController *)aController
{
    [super windowControllerDidLoadNib:aController];

    [self updateDocumentInterfaceIfNeeded];
}

// save the textfield's string value
- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError
{
    if (outError)
    {
        *outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
    }

    NSMutableData *mutableData = [[NSMutableData alloc] init];
    NSKeyedArchiver *keyedArchiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:mutableData];

    [keyedArchiver encodeObject:[textField stringValue]
                         forKey:@"ZGStringValue"];

    [keyedArchiver finishEncoding];
    [keyedArchiver release];

    return [mutableData autorelease];
}

// load the textfield's string value
- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError
{
    if (outError)
    {
        *outError = [NSError errorWithDomain:NSOSStatusErrorDomain code:unimpErr userInfo:NULL];
    }
    NSKeyedUnarchiver *keyedUnarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];

    loadedStringValue = [[keyedUnarchiver decodeObjectForKey:@"ZGStringValue"] copy];

    [self updateDocumentInterfaceIfNeeded];

    [keyedUnarchiver release];

    return YES;
}

+ (BOOL)autosavesInPlace
{
    return YES;
}

// textFields sent action when user hits enter after entering text into it
// this marks that the document has been edited
- (IBAction)changeText:(id)sender
{
    [self updateChangeCount:NSChangeDone];
}

@end