/*

File: PeopleDataSource.m

Abstract: This class acts as the data source for the ABPresence table view. 

It provides your buddies real names as well as the appropriate status gem.

Version: 1.1

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*/ 

#import "PeopleDataSource.h"

#import <InstantMessage/IMService.h>

#import "ABPersonDisplayNameAdditions.h"

#import "ServiceWatcher.h"

@implementation PeopleDataSource

- (void) dealloc

{

    [_abPeople release];

    [_imPersonStatus release];

    [super dealloc];

}

// Initialize and register for AddressBook notifications

- (void) awakeFromNib

{

    _imPersonStatus = [[NSMutableArray alloc] init];

    // We don't need to query the staus of everyone, we will wait for notifications of

    // their status to arrive, so we just set them all up as offline.

    [self setupABPeople];

    [[NSNotificationCenter defaultCenter] addObserver: self

                                             selector: @selector(abDatabaseChangedExternallyNotification:)

                                                 name: kABDatabaseChangedExternallyNotification

                                               object: nil];

    [[NSNotificationCenter defaultCenter] addObserver: self

                                             selector: @selector(addressBookPersonStatusChanged:)

                                                 name: kAddressBookPersonStatusChanged

                                               object: nil];

    [[NSNotificationCenter defaultCenter] addObserver: self

                                             selector: @selector(statusImagesChanged:)

                                                 name: kStatusImagesChanged

                                               object: nil];

}

#pragma mark -

#pragma mark Data Loading

/* This dumps all the status information and rebuilds the array against the current _abPeople

   Fairly expensive, so this is only done when necessary */

- (void) rebuildStatusInformation

{   

    // Now scan through all the people, adding their status to the status cache array

    int i = 0, count = [_abPeople count];

    for ( i = 0 ; i < count ; i++ ) {

        ABPerson * person = [_abPeople objectAtIndex: i];

        IMPersonStatus bestStatus = IMPersonStatusOffline; // Let's assume they're offline to start

        for (IMService * service in [IMService allServices]) {

            NSArray * screenNames = [service screenNamesForPerson: person];

            for (NSString * screenName in screenNames) {

                NSDictionary * dictionary = [service infoForScreenName: screenName];

                NSNumber * status = [dictionary objectForKey: IMPersonStatusKey];

                if ( status != nil ) {

                    IMPersonStatus thisStatus = [status intValue];

                    if ( IMComparePersonStatus(bestStatus, thisStatus) != NSOrderedAscending ) 

                        bestStatus = thisStatus;

                }

            }

        }

        [_imPersonStatus replaceObjectAtIndex: i withObject: [NSNumber numberWithUnsignedInt: bestStatus]];

    }

    [_table reloadData];

}

/* Rebuild status information for a given person, much faster than a full rebuild */

- (void) rebuildStatusInformationForPerson:(ABPerson *)forPerson

{

    int i = 0, count = [_abPeople count];

    for ( i = 0 ; i < count ; i++ ) {

        ABPerson * person = [_abPeople objectAtIndex: i];

        // If this is the person we're looking for

        if ( person == forPerson ) {

            IMPersonStatus bestStatus = IMPersonStatusOffline; // Let's assume they're offline to start

            // Scan through all the services, taking the 'best' status we can find

            for (IMService * service in [IMService allServices]) {

                NSArray * screenNames = [service screenNamesForPerson: person];

                // Ask for the status on each of their screen names

                for (NSString * screenName in screenNames) {

                    NSDictionary * dictionary = [service infoForScreenName: screenName];

                    NSNumber * status = [dictionary objectForKey: IMPersonStatusKey];

                    if ( status != nil ) {

                        IMPersonStatus thisStatus = [status intValue];

                        if ( IMComparePersonStatus(bestStatus, thisStatus) != NSOrderedAscending ) 

                            bestStatus = thisStatus;

                    }

                }

            }

            [_imPersonStatus replaceObjectAtIndex: i withObject: [NSNumber numberWithUnsignedInt: bestStatus]];

            [_table reloadData];

            break;

        }       

    }

}

/* Sets up all our internal data */

- (void) setupABPeople

{

    // Forget all my old people

    [_abPeople release];

    // Keep around a copy of all the people in the AB now

    _abPeople = [[[ABAddressBook sharedAddressBook] people] mutableCopy];

    // Sort them by display name

    [_abPeople sortUsingSelector: @selector(compareDisplayNames:)];

    // Assume everyone is offline.

    [_imPersonStatus removeAllObjects];

    int i = 0, count = [_abPeople count];

    NSNumber *offlineNumber =  [NSNumber numberWithUnsignedInt: IMPersonStatusOffline];

    for ( i = 0 ; i < count ; i++ ) {

        [_imPersonStatus addObject:offlineNumber];

    }

}

/* This will do a full flush of people in our AB Cache, along with rebuilding their status */

- (void) reloadABPeople

{

    [self setupABPeople];

    // Now recache all the status info, this will spawn a reload of the table

    [self rebuildStatusInformation];

}

#pragma mark -

#pragma mark NSTableView Data Source

- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView

{

    return [_abPeople count];

}

- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row

{

    NSString * identifier = [tableColumn identifier];

    if ( [identifier isEqualToString: @"image"]) {

        IMPersonStatus status = [[_imPersonStatus objectAtIndex: row] intValue];

        return [NSImage imageNamed: [IMService imageNameForStatus: status]];

    } else if ( [identifier isEqualToString: @"name"] ) {

        return [[_abPeople objectAtIndex: row] displayName];

    }

    return nil;

}

#pragma mark -

#pragma mark Notifications

// Posted from ServiceWatcher

// The object of this notification is an ABPerson who's status has

// Changed

- (void) addressBookPersonStatusChanged:(NSNotification *)notification

{

    [self rebuildStatusInformationForPerson: [notification object]];

}

// Posted from ServiceWatcher

// We should reload the tableview, because the user has changed the

// status images that iChat is using.

- (void) statusImagesChanged:(NSNotification *)notification

{

    [_table reloadData];

}

// If the AB database changes, force a reload of everyone

// We could look in the notification to catch differential updates, but for now

// This is fine.

- (void) abDatabaseChangedExternallyNotification:(NSNotification *)notification

{

    [self reloadABPeople];

}

@end