/*

     File: APLMasterViewController.m

 Abstract: UITableViewController subclass for managing the table and other UI.

  Version: 2.2

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 */

#import "APLMasterViewController.h"

@interface APLMasterViewController () <UIActionSheetDelegate>

/*

 These outlets to the buttons use a `strong` reference instead of `weak` because we want

 to keep the buttons around even if they're not inside a view.

 */

@property (nonatomic, strong) IBOutlet UIBarButtonItem *editButton;

@property (nonatomic, strong) IBOutlet UIBarButtonItem *cancelButton;

@property (nonatomic, strong) IBOutlet UIBarButtonItem *deleteButton;

@property (nonatomic, strong) IBOutlet UIBarButtonItem *addButton;

// A simple array of strings for the data model.

@property (nonatomic, strong) NSMutableArray *dataArray;

@end

#pragma mark -

@implementation APLMasterViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    /*

     This option is also selected in the storyboard. Usually it is better to configure a table view in a xib/storyboard, but we're redundantly configuring this in code to demonstrate how to do that.

     */

    self.tableView.allowsMultipleSelectionDuringEditing = YES;

    // populate the data array with some example objects

    self.dataArray = [NSMutableArray new];

    NSString *itemFormatString = NSLocalizedString(@"Item %d", @"Format string for item");

    for (unsigned int itemNumber = 1; itemNumber <= 12; itemNumber++)

    {

        NSString *itemName = [NSString stringWithFormat:itemFormatString, itemNumber];

        [self.dataArray addObject:itemName];

    }

    // make our view consistent

    [self updateButtonsToMatchTableState];

}

#pragma mark - UITableViewDelegate

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

    return self.dataArray.count;

}

- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath

{

    // Update the delete button's title based on how many items are selected.

    [self updateDeleteButtonTitle];

}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

    // Update the delete button's title based on how many items are selected.

    [self updateButtonsToMatchTableState];

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

    // Configure a cell to show the corresponding string from the array.

    static NSString *kCellID = @"cellID";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID];

    cell.textLabel.text = [self.dataArray objectAtIndex:indexPath.row];

    return cell;

}

#pragma mark - Action methods

- (IBAction)editAction:(id)sender

{

    [self.tableView setEditing:YES animated:YES];

    [self updateButtonsToMatchTableState];

}

- (IBAction)cancelAction:(id)sender

{

    [self.tableView setEditing:NO animated:YES];

    [self updateButtonsToMatchTableState];

}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex

{

    // The user tapped one of the OK/Cancel buttons.

    if (buttonIndex == 0)

    {

        // Delete what the user selected.

        NSArray *selectedRows = [self.tableView indexPathsForSelectedRows];

        BOOL deleteSpecificRows = selectedRows.count > 0;

        if (deleteSpecificRows)

        {

            // Build an NSIndexSet of all the objects to delete, so they can all be removed at once.

            NSMutableIndexSet *indicesOfItemsToDelete = [NSMutableIndexSet new];

            for (NSIndexPath *selectionIndex in selectedRows)

            {

                [indicesOfItemsToDelete addIndex:selectionIndex.row];

            }

            // Delete the objects from our data model.

            [self.dataArray removeObjectsAtIndexes:indicesOfItemsToDelete];

            // Tell the tableView that we deleted the objects

            [self.tableView deleteRowsAtIndexPaths:selectedRows withRowAnimation:UITableViewRowAnimationAutomatic];

        }

        else

        {

            // Delete everything, delete the objects from our data model.

            [self.dataArray removeAllObjects];

            // Tell the tableView that we deleted the objects.

            // Because we are deleting all the rows, just reload the current table section

            [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationAutomatic];

        }

        // Exit editing mode after the deletion.

        [self.tableView setEditing:NO animated:YES];

        [self updateButtonsToMatchTableState];

    }

}

- (IBAction)deleteAction:(id)sender

{

    // Open a dialog with just an OK button.

    NSString *actionTitle;

    if (([[self.tableView indexPathsForSelectedRows] count] == 1)) {

        actionTitle = NSLocalizedString(@"Are you sure you want to remove this item?", @"");

    }

    else

    {

        actionTitle = NSLocalizedString(@"Are you sure you want to remove these items?", @"");

    }

    NSString *cancelTitle = NSLocalizedString(@"Cancel", @"Cancel title for item removal action");

    NSString *okTitle = NSLocalizedString(@"OK", @"OK title for item removal action");

    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:actionTitle

                                                             delegate:self

                                                    cancelButtonTitle:cancelTitle

                                               destructiveButtonTitle:okTitle

                                                    otherButtonTitles:nil];

    actionSheet.actionSheetStyle = UIActionSheetStyleDefault;

    // Show from our table view (pops up in the middle of the table).

    [actionSheet showInView:self.view];

}

- (IBAction)addAction:(id)sender

{

    // Tell the tableView we're going to add (or remove) items.

    [self.tableView beginUpdates];

    // Add an item to the array.

    [self.dataArray addObject:@"New Item"];

    // Tell the tableView about the item that was added.

    NSIndexPath *indexPathOfNewItem = [NSIndexPath indexPathForRow:(self.dataArray.count - 1) inSection:0];

    [self.tableView insertRowsAtIndexPaths:@[indexPathOfNewItem]

                          withRowAnimation:UITableViewRowAnimationAutomatic];

    // Tell the tableView we have finished adding or removing items.

    [self.tableView endUpdates];

    // Scroll the tableView so the new item is visible

    [self.tableView scrollToRowAtIndexPath:indexPathOfNewItem

                          atScrollPosition:UITableViewScrollPositionBottom

                                  animated:YES];

    // Update the buttons if we need to.

    [self updateButtonsToMatchTableState];

}

#pragma mark - Updating button state

- (void)updateButtonsToMatchTableState

{

    if (self.tableView.editing)

    {

        // Show the option to cancel the edit.

        self.navigationItem.rightBarButtonItem = self.cancelButton;

        [self updateDeleteButtonTitle];

        // Show the delete button.

        self.navigationItem.leftBarButtonItem = self.deleteButton;

    }

    else

    {

        // Not in editing mode.

        self.navigationItem.leftBarButtonItem = self.addButton;

        // Show the edit button, but disable the edit button if there's nothing to edit.

        if (self.dataArray.count > 0)

        {

            self.editButton.enabled = YES;

        }

        else

        {

            self.editButton.enabled = NO;

        }

        self.navigationItem.rightBarButtonItem = self.editButton;

    }

}

- (void)updateDeleteButtonTitle

{

    // Update the delete button's title, based on how many items are selected

    NSArray *selectedRows = [self.tableView indexPathsForSelectedRows];

    BOOL allItemsAreSelected = selectedRows.count == self.dataArray.count;

    BOOL noItemsAreSelected = selectedRows.count == 0;

    if (allItemsAreSelected || noItemsAreSelected)

    {

        self.deleteButton.title = NSLocalizedString(@"Delete All", @"");

    }

    else

    {

        NSString *titleFormatString =

            NSLocalizedString(@"Delete (%d)", @"Title for delete button with placeholder for number");

        self.deleteButton.title = [NSString stringWithFormat:titleFormatString, selectedRows.count];

    }

}

@end