/*

     File: EditingViewController.m

 Abstract: The table view controller responsible for editing a field of data -- either text or a date.

  Version: 1.5

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 */

#import "EditingViewController.h"

@interface EditingViewController ()

@property (nonatomic, weak) IBOutlet UITextField *textField;

@property (nonatomic, weak) IBOutlet UIDatePicker *datePicker;

@property (nonatomic, readonly, getter=isEditingDate) BOOL editingDate;

@end

#pragma mark -

@implementation EditingViewController

{

    BOOL _hasDeterminedWhetherEditingDate;

    BOOL _editingDate;

}

#pragma mark - View lifecycle

- (void)viewDidLoad

{

    // Set the title to the user-visible name of the field.

    self.title = self.editedFieldName;

}

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    // Configure the user interface according to state.

    if (self.editingDate) {

        self.textField.hidden = YES;

        self.datePicker.hidden = NO;

        NSDate *date = [self.editedObject valueForKey:self.editedFieldKey];

        if (date == nil) {

            date = [NSDate date];

        }

        self.datePicker.date = date;

    }

    else {

        self.textField.hidden = NO;

        self.datePicker.hidden = YES;

        self.textField.text = [self.editedObject valueForKey:self.editedFieldKey];

        self.textField.placeholder = self.title;

        [self.textField becomeFirstResponder];

    }

}

#pragma mark - Save and cancel operations

- (IBAction)save:(id)sender

{

    // Set the action name for the undo operation.

    NSUndoManager * undoManager = [[self.editedObject managedObjectContext] undoManager];

    [undoManager setActionName:[NSString stringWithFormat:@"%@", self.editedFieldName]];

    // Pass current value to the edited object, then pop.

    if (self.editingDate) {

        [self.editedObject setValue:self.datePicker.date forKey:self.editedFieldKey];

    }

    else {

        [self.editedObject setValue:self.textField.text forKey:self.editedFieldKey];

    }

    [self.navigationController popViewControllerAnimated:YES];

}

- (IBAction)cancel:(id)sender

{

    // Don't pass current value to the edited object, just pop.

    [self.navigationController popViewControllerAnimated:YES];

}

#pragma mark - Manage whether editing a date

- (void)setEditedFieldKey:(NSString *)editedFieldKey

{

    if (![_editedFieldKey isEqualToString:editedFieldKey]) {

        _hasDeterminedWhetherEditingDate = NO;

        _editedFieldKey = editedFieldKey;

    }

}

- (BOOL)isEditingDate

{

    if (_hasDeterminedWhetherEditingDate == YES) {

        return _editingDate;

    }

    NSEntityDescription *entity = [self.editedObject entity];

    NSAttributeDescription *attribute = [entity attributesByName][self.editedFieldKey];

    NSString *attributeClassName = [attribute attributeValueClassName];

    if ([attributeClassName isEqualToString:@"NSDate"]) {

        _editingDate = YES;

    }

    else {

        _editingDate = NO;

    }

    _hasDeterminedWhetherEditingDate = YES;

    return _editingDate;

}

@end