//
//  MBFrontFileMonitor.m
//  MBMenuExtra
//
//  Created by Work on 6/9/09.
//  Copyright 2009 __MyCompanyName__. All rights reserved.
//

#import "NGAActiveFileMonitor.h"
#import "NGAUtilities.h"
#import "NGARemoteAccessibleObject.h"

/* Useful Accesibility links
   http://developer.apple.com/mac/library/DOCUMENTATION/Accessibility/Reference/AccessibilityLowlevel/AXNotificationConstants_h/CompositePage.html#//apple_ref/c/macro/kAXWindowMovedNotification
   http://markmail.org/message/742lqkyxlri6k3hv#query:AXObserverAddNotification+page:1+mid:kwfyt6qqzjok2myo+state:results
   http://markmail.org/thread/kwfyt6qqzjok2myo
 */

NSString * const NGAActiveFileChangedNotification = @"MBActiveFileChangedNotification";
NSString * const NGAWindowTitleChangedNotification = @"NGAWindowTitleChangedNotification";

NSString * const kMonitoredApplicationElementKey = @"monitoredApplicationElement";

RUNTIME_CONSTANT_FUNCTION( NSString *, keyPathToMainWindowTitle,
                          ([[NSString stringWithFormat:@"%@.%@.%@", kMonitoredApplicationElementKey, NSAccessibilityMainWindowAttribute, NSAccessibilityTitleAttribute] retain]) )

//RUNTIME_CONSTANT_FUNCTION( NSString *, alternativeKeyPathToMainWindowTitle,
//                          ([[NSString stringWithFormat:@"%@.%@.%@.%@", kMonitoredApplicationElementKey, NSAccessibilityMainWindowAttribute, NSAccessibilityTitleUIElementAttribute, NSAccessibilityValueAttribute] retain]) )

RUNTIME_CONSTANT_FUNCTION( NSString *, keyPathToMainWindowDocument,
                          ([[NSString stringWithFormat:@"%@.%@.%@", kMonitoredApplicationElementKey, NSAccessibilityMainWindowAttribute, NSAccessibilityDocumentAttribute] retain]) )


@interface NGAActiveFileMonitor ()

-(void)valueDidChangeForForegroundApplication;

@property (nonatomic, readwrite, assign) BOOL   isMonitoring;
@property (nonatomic, readwrite, retain) NGARemoteAccessibleObject * monitoredApplicationElement;
@property (nonatomic, readonly,) NSString * mainWindowDocumentPathURL;
@end



@implementation NGAActiveFileMonitor
@synthesize
ignoredProcessBundleIDs = _ignoredProcessBundleIDs
, monitoredApplicationElement = _monitoredApplicationElement
, isMonitoring = _isMonitoring
, mainWindowTitle = _mainWindowTitle
;

SINGLETON_IMPLEMENTATION(NGAActiveFileMonitor, sharedMonitor)

-(id)init
{
    if ( (self = [super init]) == nil )
        return nil;
    
    [self registerAllAutoObservationMethods];
    
    return self;
}

- (void)dealloc
{
    [self stopMonitoring];
    self.ignoredProcessBundleIDs = nil;
    [self unregisterAllAutoObservationMethods];
    [super dealloc];
}

-(void)applicationDidActivate:(NSNotification*)note
{
    LOG_DEBUG(@"Foregound application did change");
    [self valueDidChangeForForegroundApplication];
}

-(void)startMonitoring
{
    self.isMonitoring = YES;
    
    [self valueDidChangeForForegroundApplication];
    
    [[[NSWorkspace sharedWorkspace] notificationCenter] addObserver:self selector:@selector(applicationDidActivate:) name:NSWorkspaceDidActivateApplicationNotification object:nil];
}


-(void)stopMonitoring
{
    LOG_DEBUG(@"Stopping monitoring");
    [[[NSWorkspace sharedWorkspace] notificationCenter] removeObserver:self];
    self.monitoredApplicationElement = nil;
    self.isMonitoring = NO;
}

#pragma mark monitoredApplication

-(NSSet*)keyPathsForValuesAffectingMonitoredApplication
{
    return [NSSet setWithObject:kMonitoredApplicationElementKey];
}

-(NSRunningApplication*)monitoredApplication
{
    return [NSRunningApplication runningApplicationWithProcessIdentifier:self.monitoredApplicationElement.processIdentifier];
}

-(void)valueDidChangeForForegroundApplication
{
    NSRunningApplication * foregroundApplication = [NSRunningApplication foregroundApplication];
    if ([self.ignoredProcessBundleIDs containsObject:foregroundApplication.bundleIdentifier] || foregroundApplication.isAgent)
    {
        LOG_DEBUG(@"Ignoring process: %@", foregroundApplication.bundleIdentifier);
        return;
    }
    LOG_DEBUG(@"Observing process: %@", foregroundApplication.bundleIdentifier);
    self.monitoredApplicationElement = [NGARemoteAccessibleObject applicationElementForProcessIdentifier:foregroundApplication.processIdentifier];
}

#pragma mark mainWindowDocumentPath

+(NSSet*)keyPathsForValuesAffectingMainWindowDocumentPath
{
    return [NSSet setWithObject:@"mainWindowDocumentPathURL"];
}

-(NSString*)mainWindowDocumentPath
{
    if (!self.mainWindowDocumentPathURL)
        return nil;
    
    NSURL * url = [NSURL URLWithString:self.mainWindowDocumentPathURL];
    
    if ([url isFileURL])
        return [url path];
    
    return nil;
}

+(NSSet*)keyPathsForValuesAffectingMainWindowDocumentPathURL
{
    return [NSSet setWithObject:keyPathToMainWindowDocument()];
}

-(NSString*)mainWindowDocumentPathURL
{
    return [self valueForKeyPath:keyPathToMainWindowDocument()];
}

#pragma mark mainWindowDocumentTitle

+(NSSet*)keyPathsForValuesAffectingMainWindowTitle
{
    return [NSSet setWithObjects:keyPathToMainWindowTitle(), nil]; //alternativeKeyPathToMainWindowTitle(), nil];
}

-(NSString*)mainWindowTitle
{
    NSString * title = nil;//[self valueForKeyPath:alternativeKeyPathToMainWindowTitle()];
    
    if (!title)
        title = [self valueForKeyPath:keyPathToMainWindowTitle()];

    return title;
}

#pragma mark sending notifications

-(void)valueDidChangeForMainWindowDocumentPath:(NSDictionary*)change
{
    NSNotification * notification = [NSNotification notificationWithName:NGAActiveFileChangedNotification
                                                                  object:self
                                                                userInfo:change];
    
    [[NSNotificationCenter defaultCenter] postNotification:notification];
//    LOG_DEBUG(@"NGAActiveFileChangedNotification posted! %@", change);
}

-(void)valueDidChangeForMainWindowTitle:(NSDictionary*)change
{
    NSNotification * notification = [NSNotification notificationWithName:NGAWindowTitleChangedNotification
                                                                  object:self
                                                                userInfo:change];
    
//    LOG_DEBUG(@"NGAWindowTitleChangedNotification posted! %@", change);
    [[NSNotificationCenter defaultCenter] postNotification:notification];
}



@end