/*

     File: MyDocument.m

 Abstract: Document object to manage a collection of text snippets; the snippets may be displayed in one or two windows:

 * A window managed by a DisplayController window controller which is solely for display purposes;

 * Optionally, a window managed by an EditController window controller, which is used for editing the snippets. 

  Version: 1.1

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 */

#import "MyDocument.h"

#import "DisplayController.h"

#import "EditController.h"

#import "Step.h"

@implementation MyDocument

@synthesize displayController;

#pragma mark -

#pragma mark Services methods

/*

 Service items apply to the display controller.

 */

-(NSString *)textForCurrentSelectionAndAdvance {

    return [displayController textForCurrentSelectionAndAdvance];

}

- (void)rewind {

    [displayController rewind];

}

- (void)moveUpOneLine {

    [displayController moveUpOneLine];

}

- (void)moveDownOneLine {

    [displayController moveDownOneLine];

}

- (void)createNewStep:(NSPasteboard *)pboard userData:(NSString *)data error:(NSString **)error {

    NSArray *newSteps = [pboard readObjectsForClasses:[NSArray arrayWithObject:[Step class]] options:[NSDictionary dictionary]];

    if ([newSteps count] != 1) {

        *error = NSLocalizedString(@"Couldn't create a step", @"Service error message");

        return;

    }

    Step *newStep = [newSteps objectAtIndex:0];    

    NSUInteger currentStepCount = [self countOfSteps];    

    newStep.tableSummary = [NSString stringWithFormat:@"Step %d", currentStepCount];

    newStep.undoManager = [self undoManager];

    [self insertObject:newStep inStepsAtIndex:currentStepCount];    

    [self editSteps:nil];

}

#pragma mark -

#pragma mark Reading and writing file

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError {

    NSArray *newSteps = [NSKeyedUnarchiver unarchiveObjectWithData:data];

    self.steps = newSteps;

    return YES;

}

- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError {

    return [NSKeyedArchiver archivedDataWithRootObject:steps];

}

#pragma mark -

#pragma mark Managing window controllers

- (void)makeWindowControllers {

    // Create the display controller and keep a reference to it.

    DisplayController *aDisplayController = [[DisplayController alloc] initWithWindowNibName:@"Display"];

    [aDisplayController setShouldCloseDocument:YES];

    [aDisplayController showWindow:self];

    [self addWindowController:aDisplayController];

    self.displayController = aDisplayController;

    [aDisplayController release];

}

- (EditController *)editController {

    /*

     If an edit controller exists, it's the second object in window controllers array.  If there's only one item in the array, create a new edit controller.

     */

    EditController *editController = nil;

    NSArray *myWindowControllers = [self windowControllers];

    if ([myWindowControllers count] == 1) {

        editController = [[EditController alloc] initWithWindowNibName:@"Edit"];

        [self addWindowController:editController];

        [editController release];

        // Position the edit window atop the display window.

        NSRect frame = [[displayController window] frame];

        NSPoint topLeft = frame.origin;

        topLeft.y += [[[displayController window] contentView] frame].size.height;

        [[editController window] setFrameTopLeftPoint:topLeft];

    }

    else {

        editController = [myWindowControllers objectAtIndex:1];

    }

    return editController;

}    

- (IBAction)editSteps:sender {

    [self.editController showWindow:self];

}

#pragma mark -

#pragma mark Steps accessors

- (NSUInteger)countOfSteps {

    return [steps count];

}

- (id)objectInStepsAtIndex:(NSUInteger)idx {

    return [steps objectAtIndex:idx];

}

- (void)insertObject:(id)anObject inStepsAtIndex:(NSUInteger)idx {

    [[[self undoManager] prepareWithInvocationTarget:self] removeObjectFromStepsAtIndex:idx];        

    [steps insertObject:anObject atIndex:idx];

}

- (void)removeObjectFromStepsAtIndex:(NSUInteger)idx {

    id anObject = [self objectInStepsAtIndex:idx];

    [[[self undoManager] prepareWithInvocationTarget:self] insertObject:anObject inStepsAtIndex:idx];    

    [steps removeObjectAtIndex:idx];

}

- (void)replaceObjectInStepsAtIndex:(unsigned int)idx withObject:(id)anObject {

    id oldObject = [self objectInStepsAtIndex:idx];

    [[[self undoManager] prepareWithInvocationTarget:self] replaceObjectInStepsAtIndex:idx withObject:oldObject];

    [steps replaceObjectAtIndex:idx withObject:anObject];

}

- (NSArray *)steps {

    return steps;

}

- (void)setSteps:(NSArray *)aSteps {

    if (steps != aSteps) {

        [steps release];

        steps = [aSteps mutableCopy];

    }

}

#pragma mark -

#pragma mark Object lifecycle

- init {

    if (self = [super init]) {

        steps = [[NSMutableArray alloc] init];

    }

    return self;    

}

- (void)dealloc {

    [steps release];

    [super dealloc];

}

@end