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//
// SGHotKeyCenter.m
// SGHotKeyCenter
//
// Created by Justin Williams on 7/26/09.
// Copyright 2009 Second Gear. All rights reserved.
//

#import <Carbon/Carbon.h>
#import "SGHotKeyCenter.h"
#import "SGHotKey.h"
#import "SGKeyCombo.h"

OSType const kHotKeySignature = 'SGHk';

@interface SGHotKeyCenter ()

- (SGHotKey *)_hotKeyForCarbonHotKey:(EventHotKeyRef)carbonHotKey;
- (EventHotKeyRef)_carbonHotKeyForHotKey:(SGHotKey *)hotKey;

- (void)_updateEventHandler;
- (void)_hotKeyDown: (SGHotKey *)hotKey;

@end

static OSStatus hotKeyEventHandler(EventHandlerCallRef inHandlerRef, EventRef inEvent, void* refCon );
static SGHotKeyCenter *sharedCenter = nil;

@implementation SGHotKeyCenter

+ (void)initialize {
if (!sharedCenter) {
sharedCenter = [[self alloc] init];
}
}

- (void)dealloc {
[hotKeys release];
[super dealloc];
}

+ (SGHotKeyCenter *)sharedCenter {
return sharedCenter;
}

+ (id) allocWithZone:(NSZone *)zone {
//Usually already set by +initialize.
if (sharedCenter) {
//The caller expects to receive a new object, so implicitly retain it to balance out the caller's eventual release message.
return [sharedCenter retain];
} else {
//When not already set, +initialize is our caller—it's creating the shared instance. Let this go through.
return [super allocWithZone:zone];
}
}

- (id) init {
if (!hasInited) {
if ((self = [super init])) {
//Initialize the instance here.
hotKeys = [[NSMutableDictionary alloc] init];
hasInited = YES;
}
}

return self;
}

- (BOOL)registerHotKey:(SGHotKey *)theHotKey {
OSStatus error;
EventHotKeyID hotKeyID;
EventHotKeyRef carbonHotKey;
NSValue *key = nil;

if ([[self allHotKeys] containsObject:theHotKey])
[self unregisterHotKey:theHotKey];

if (![[theHotKey keyCombo] isValidHotKeyCombo])
return YES;

static UInt32 currentId = 0;
hotKeyID.signature = kHotKeySignature;
hotKeyID.id = ++currentId;

theHotKey.hotKeyID = hotKeyID;

error = RegisterEventHotKey((UInt32)theHotKey.keyCombo.keyCode,
(UInt32)theHotKey.keyCombo.modifiers,
hotKeyID,
GetEventMonitorTarget(),
// GetEventDispatcherTarget(),
0,
&carbonHotKey);

if (error)
return NO;

key = [NSValue valueWithPointer:carbonHotKey];

if (theHotKey && key)
[hotKeys setObject:theHotKey forKey:key];

[self _updateEventHandler];

return YES;
}


- (void)unregisterHotKey:(SGHotKey *)theHotKey {
EventHotKeyRef carbonHotKey;
NSValue *key = nil;

if (![[self allHotKeys] containsObject:theHotKey])
return;

carbonHotKey = [self _carbonHotKeyForHotKey:theHotKey];
NSAssert(carbonHotKey != nil, @"");

UnregisterEventHotKey(carbonHotKey);

key = [NSValue valueWithPointer:carbonHotKey];
[hotKeys removeObjectForKey:key];

[self _updateEventHandler];
}

- (NSArray *)allHotKeys {
return [hotKeys allValues];
}


- (SGHotKey *)hotKeyWithIdentifier:(id)theIdentifier {
if (!theIdentifier)
return nil;

for (SGHotKey *hotKey in [self allHotKeys]) {
if([[hotKey identifier] isEqual:theIdentifier] )
return hotKey;
}

return nil;
}

- (OSStatus)processCarbonEvent:(EventRef)event {
OSStatus error;
EventHotKeyID hotKeyID;
SGHotKey *hotKey = nil;

NSAssert(GetEventClass(event) == kEventClassKeyboard, @"Unknown event class");

error = GetEventParameter(event,
kEventParamDirectObject,
typeEventHotKeyID,
nil,
sizeof(EventHotKeyID),
nil,
&hotKeyID);
if (error)
return error;

NSAssert(hotKeyID.signature == kHotKeySignature, @"Invalid hot key id");
NSAssert(hotKeyID.id != 0, @"Invalid hot key id");

for (SGHotKey *thisHotKey in [self allHotKeys]) {
if ([thisHotKey matchesHotKeyID:hotKeyID]) {
hotKey = thisHotKey;
break;
}
}

switch (GetEventKind(event)) {
case kEventHotKeyPressed:
[self _hotKeyDown:hotKey];
break;

default:
NSAssert(0, @"Unknown event kind");
break;
}

return eventNotHandledErr;
}

- (SGHotKey *)_hotKeyForCarbonHotKey:(EventHotKeyRef)carbonHotKey {
NSValue *key = [NSValue valueWithPointer:carbonHotKey];
return [hotKeys objectForKey:key];
}

- (EventHotKeyRef)_carbonHotKeyForHotKey:(SGHotKey *)hotKey {
NSArray *values;
NSValue *value;

values = [hotKeys allKeysForObject:hotKey];
NSAssert([values count] == 1, @"Failed to find Carbon Hotkey for SGHotKey");

value = [values lastObject];

return (EventHotKeyRef)[value pointerValue];
}

- (void)_updateEventHandler {
static EventHandlerUPP handler = NewEventHandlerUPP(hotKeyEventHandler);

if ([hotKeys count] && eventHandlerInstalled == NO) {
EventTypeSpec eventSpec[1] = {
{ kEventClassKeyboard, kEventHotKeyPressed }
};

InstallEventHandler(GetEventMonitorTarget(), handler, 1, eventSpec, NULL, NULL);
eventHandlerInstalled = YES;
}
}

- (void)_hotKeyDown:(SGHotKey *)hotKey {
[hotKey invoke];
}

static OSStatus hotKeyEventHandler(EventHandlerCallRef theHandlerRef, EventRef theEvent, void *userData ) {
OSStatus result = [[SGHotKeyCenter sharedCenter] processCarbonEvent:theEvent];
return result;
}

@end
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