/*

     File: GroupViewController.m

 Abstract: Prompts a user for access to their address book data, then updates its UI according to their response.

 Adds, displays, and removes group records from Contacts.

  Version: 1.1

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*/

#import "AddGroupViewController.h"

#import "GroupViewController.h"

#import "MySource.h"

@interface GroupViewController ()

@property (nonatomic, assign) ABAddressBookRef addressBook;

@property (nonatomic, strong) NSMutableArray *sourcesAndGroups;

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

@end

@implementation GroupViewController

#pragma mark -

#pragma mark View lifecycle

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Create an address book object

    _addressBook = ABAddressBookCreateWithOptions(NULL, NULL);

    //Display all groups available in the Address Book

    self.sourcesAndGroups = [[NSMutableArray alloc] initWithCapacity:0];

    // Check whether we are authorized to access the user's address book data

    [self checkAddressBookAccess];

}

#pragma mark -

#pragma mark Address Book Access

// Check the authorization status of our application for Address Book

-(void)checkAddressBookAccess

{

    switch (ABAddressBookGetAuthorizationStatus())

    {

        // Update our UI if the user has granted access to their Contacts 

        case  kABAuthorizationStatusAuthorized:

              [self accessGrantedForAddressBook];

              break;

        // Prompt the user for access to Contacts if there is no definitive answer

        case  kABAuthorizationStatusNotDetermined :

              [self requestAddressBookAccess];

              break;

        // Display a message if the user has denied or restricted access to Contacts

        case  kABAuthorizationStatusDenied:

        case  kABAuthorizationStatusRestricted:

        {

            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Privacy Warning"

                                                            message:@"Permission was not granted for Contacts."

                                                           delegate:nil

                                                  cancelButtonTitle:@"OK"

                                                  otherButtonTitles: nil];

            [alert show];

        }

            break;

        default:

            break;

    }

}

// Prompt the user for access to their Address Book data

-(void)requestAddressBookAccess

{

    GroupViewController * __weak weakSelf = self;

    ABAddressBookRequestAccessWithCompletion(self.addressBook, ^(bool granted, CFErrorRef error)

    {

        if (granted)

        {

            dispatch_async(dispatch_get_main_queue(), ^{

              [weakSelf accessGrantedForAddressBook];

            });

        }

    });

}

// This method is called when the user has granted access to their address book data.

-(void)accessGrantedForAddressBook

{

    // Enable the Add button

    self.addButton.enabled = YES;

    // Add the Edit button

    self.navigationItem.leftBarButtonItem = self.editButtonItem;

    // Fetch all groups available in address book

    self.sourcesAndGroups = [self fetchGroupsInAddressBook:self.addressBook];

    [self.tableView reloadData];

}

#pragma mark -

#pragma mark Manage groups

// Return the name associated with the given identifier

- (NSString *)nameForSourceWithIdentifier:(int)identifier

{

    switch (identifier)

    {

        case kABSourceTypeLocal:

            return @"On My Device";

            break;

        case kABSourceTypeExchange:

            return @"Exchange server";

            break;

        case kABSourceTypeExchangeGAL:

            return @"Exchange Global Address List";

            break;

        case kABSourceTypeMobileMe:

            return @"MobileMe";

            break;

        case kABSourceTypeLDAP:

            return @"LDAP server";

            break;

        case kABSourceTypeCardDAV:

            return @"CardDAV server";

            break;

        case kABSourceTypeCardDAVSearch:

            return @"Searchable CardDAV server";

            break;

        default:

            break;

    }

    return nil;

}

// Return the name of a given group

- (NSString *)nameForGroup:(ABRecordRef)group

{

    return (NSString *)CFBridgingRelease(ABRecordCopyCompositeName(group));

}

// Return the name of a given source

- (NSString *)nameForSource:(ABRecordRef)source

{

    // Fetch the source type 

    CFNumberRef sourceType = ABRecordCopyValue(source, kABSourceTypeProperty);

    // Fetch and return the name associated with the source type

    return [self nameForSourceWithIdentifier:[(NSNumber*)CFBridgingRelease(sourceType) intValue]];

}

#pragma mark -

#pragma mark Manage Address Book contacts

// Create and add a new group to the address book database

-(void)addGroup:(NSString *)name fromAddressBook:(ABAddressBookRef)myAddressBook

{

    BOOL sourceFound = NO;

    if ([name length] != 0)

    {

        ABRecordRef newGroup = ABGroupCreate();

        CFStringRef newName = CFBridgingRetain(name);

        ABRecordSetValue(newGroup,kABGroupNameProperty,newName,NULL);

        // Add the new group 

        ABAddressBookAddRecord(myAddressBook,newGroup, NULL);

        ABAddressBookSave(myAddressBook, NULL);

        CFRelease(newName);

        // Get the ABSource object that contains this new group

        ABRecordRef groupSource = ABGroupCopySource(newGroup);

        // Fetch the source name

        NSString *sourceName = [self nameForSource:groupSource];

        CFRelease(groupSource);

        // Look for the above source among the sources in sourcesAndGroups

        for (MySource *source in self.sourcesAndGroups)

        {

            if ([source.name isEqualToString:sourceName])

            {

                // Associate the new group with the found source

                [source.groups addObject:CFBridgingRelease(newGroup)];

                // Set sourceFound to YES if sourcesAndGroups already contains this source

                sourceFound = YES;

            }

        }

        // Add this source to sourcesAndGroups

        if (!sourceFound)

        {

            NSMutableArray *mutableArray = [[NSMutableArray alloc] initWithObjects:CFBridgingRelease(newGroup), nil];

            MySource *newSource = [[MySource alloc] initWithAllGroups:mutableArray name:sourceName];

            [self.sourcesAndGroups addObject:newSource];

        }

    }

}

// Remove a group from the given address book

- (void)deleteGroup:(ABRecordRef)group fromAddressBook:(ABAddressBookRef)myAddressBook

{

    ABAddressBookRemoveRecord(myAddressBook, group, NULL);

    ABAddressBookSave(myAddressBook, NULL);

}

// Return a list of groups organized by sources

- (NSMutableArray *)fetchGroupsInAddressBook:(ABAddressBookRef)myAddressBook

{

    NSMutableArray *list = [[NSMutableArray alloc] initWithCapacity:0];

    // Get all the sources from the address book

    NSArray *allSources = (NSArray *)CFBridgingRelease(ABAddressBookCopyArrayOfAllSources(myAddressBook));

    if ([allSources count] >0)

    {

        for (id aSource in allSources)

        {

            ABRecordRef source = (ABRecordRef)CFBridgingRetain(aSource);

            // Fetch all groups included in the current source

            CFArrayRef result = ABAddressBookCopyArrayOfAllGroupsInSource (myAddressBook, source);

            // The app displays a source if and only if it contains groups

            if ((result) && (CFArrayGetCount(result) > 0))

            {

                NSMutableArray *groups = [(__bridge NSArray *)result mutableCopy];

                // Fetch the source name

                NSString *sourceName = [self nameForSource:source];

                //Create a MySource object that contains the source name and all its groups

                MySource *source = [[MySource alloc] initWithAllGroups:groups name:sourceName];

                // Save the source object into the array

                [list addObject:source];

            }

            if (result)

            {

                CFRelease(result);

            }

            CFRelease(source);

        }

    }

    return list;

}

#pragma mark -

#pragma mark Table view data source

// Customize the number of sections in the table view

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

    return [self.sourcesAndGroups count];

}

// Customize section header titles

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

    return [[self.sourcesAndGroups objectAtIndex:section] name];

}

// Customize the number of rows in the table view

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

{

    return [[[self.sourcesAndGroups objectAtIndex:section] groups] count];

}

// Customize the appearance of table view cells.

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

{

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"groupCell" forIndexPath:indexPath];

    MySource *source = [self.sourcesAndGroups objectAtIndex:indexPath.section];

    ABRecordRef group = (ABRecordRef)CFBridgingRetain([source.groups objectAtIndex:indexPath.row]);

    cell.textLabel.text = [self nameForGroup:group];

    CFRelease(group);

    return cell;

}

#pragma mark -

#pragma mark Editing rows

- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath

{

    return UITableViewCellEditingStyleDelete;

}

- (void)setEditing:(BOOL)editing animated:(BOOL)animated

{

    [super setEditing:editing animated:animated];

    //Disable the Add button while editing

    self.navigationItem.rightBarButtonItem.enabled = !editing;

}

// Handle the deletion of a group

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath

{

    if (editingStyle == UITableViewCellEditingStyleDelete)

    {

        MySource *source = [self.sourcesAndGroups objectAtIndex:indexPath.section];

        // group to be deleted

        ABRecordRef group = (__bridge ABRecordRef)([source.groups objectAtIndex:indexPath.row]);

        // Remove the above group from its associated source

        [source.groups removeObjectAtIndex:indexPath.row];

        // Remove the group from the address book

        [self deleteGroup:group fromAddressBook:self.addressBook];

        // Update the table view

        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];

        // Remove the section from the table if the associated source does not contain any groups

        if ([source.groups count] == 0)

        {

            // Remove the source from sourcesAndGroups

            [self.sourcesAndGroups removeObject:source];

            [tableView deleteSections: [NSIndexSet indexSetWithIndex:indexPath.section]

                     withRowAnimation:UITableViewRowAnimationFade];

        }

    }

}

#pragma mark -

#pragma mark Memory management

- (void)didReceiveMemoryWarning

{

    // Release the view if it doesn't have a superview.

    [super didReceiveMemoryWarning];

}

#pragma mark -

#pragma mark Get user input

// This method is called when the user taps Done in the "Add Group" view.

- (IBAction)done:(UIStoryboardSegue *)segue

{

    if ([[segue identifier] isEqualToString:@"returnInput"])

    {

        AddGroupViewController *addGroupViewController = [segue sourceViewController];

        if (addGroupViewController.group)

        {

            [self addGroup:addGroupViewController.group fromAddressBook:self.addressBook];

            [[self tableView] reloadData];

        }

        [self dismissViewControllerAnimated:YES completion:NULL];

    }

}

// This method is called when the user taps Cancel in the "Add Group" view.

- (IBAction)cancel:(UIStoryboardSegue *)segue

{

    if ([[segue identifier] isEqualToString:@"cancelInput"])

    {

        [self dismissViewControllerAnimated:YES completion:NULL];

    }

}

- (void)dealloc

{

    if(_addressBook)

    {

        CFRelease(_addressBook);

    }

}

@end