#import "MVChatPluginManager.h"
#import "MVChatScriptPlugin.h"

@interface NSScriptObjectSpecifier (NSScriptObjectSpecifierPrivate) // Private Foundation Methods
+ (id) _objectSpecifierFromDescriptor:(NSAppleEventDescriptor *) descriptor inCommandConstructionContext:(id) context;
- (NSAppleEventDescriptor *) _asDescriptor;
@end

#pragma mark -

@interface NSAEDescriptorTranslator : NSObject // Private Foundation Class
+ (id) sharedAEDescriptorTranslator;
- (NSAppleEventDescriptor *) descriptorByTranslatingObject:(id) object ofType:(id) type inSuite:(id) suite;
- (id) objectByTranslatingDescriptor:(NSAppleEventDescriptor *) descriptor toType:(id) type inSuite:(id) suite;
- (void) registerTranslator:(id) translator selector:(SEL) selector toTranslateFromClass:(Class) class;
- (void) registerTranslator:(id) translator selector:(SEL) selector toTranslateFromDescriptorType:(unsigned int) type;
@end

#pragma mark -

@interface NSString (NSStringFourCharCode)
- (unsigned long) fourCharCode;
@end

#pragma mark -

@implementation NSString (NSStringFourCharCode)
- (unsigned long) fourCharCode {
	unsigned long ret = 0, length = [self length];

	if( length >= 1 ) ret |= ( [self characterAtIndex:0] & 0x00ff ) << 24;
	else ret |= ' ' << 24;
	if( length >= 2 ) ret |= ( [self characterAtIndex:1] & 0x00ff ) << 16;
	else ret |= ' ' << 16;
	if( length >= 3 ) ret |= ( [self characterAtIndex:2] & 0x00ff ) << 8;
	else ret |= ' ' << 8;
	if( length >= 4 ) ret |= ( [self characterAtIndex:3] & 0x00ff );
	else ret |= ' ';

	return ret;
}
@end

#pragma mark -

@implementation NSAppleScript (NSAppleScriptIdentifier)
- (NSNumber *) scriptIdentifier {
	return [NSNumber numberWithUnsignedLong:_compiledScriptID];
}
@end

#pragma mark -

@implementation MVChatScriptPlugin
- (id) initWithManager:(MVChatPluginManager *) manager {
	if( ( self = [self init] ) ) {
		_doseNotRespond = [[NSMutableSet set] retain];
		_script = nil;
	}
	return self;
}

- (id) initWithScript:(NSAppleScript *) script andManager:(MVChatPluginManager *) manager {
	if( ( self = [self initWithManager:manager] ) )
		_script = [script retain];
	return self;
}

- (void) dealloc {
	[_script release];
	[_doseNotRespond release];

	_script = nil;
	_doseNotRespond = nil;

	[super dealloc];
}

#pragma mark -

- (NSAppleScript *) script {
	return _script;
}

- (id) callScriptHandler:(unsigned long) handler withArguments:(NSDictionary *) arguments forSelector:(SEL) selector {
	if( ! _script ) return nil;

	int pid = [[NSProcessInfo processInfo] processIdentifier];
	NSAppleEventDescriptor *targetAddress = [NSAppleEventDescriptor descriptorWithDescriptorType:typeKernelProcessID bytes:&pid length:sizeof( pid )];
	NSAppleEventDescriptor *event = [NSAppleEventDescriptor appleEventWithEventClass:'cplG' eventID:handler targetDescriptor:targetAddress returnID:kAutoGenerateReturnID transactionID:kAnyTransactionID];

	NSEnumerator *enumerator = [arguments objectEnumerator];
	NSEnumerator *kenumerator = [arguments keyEnumerator];
	NSAppleEventDescriptor *descriptor = nil;
	NSString *key = nil;
	id value = nil;

	while( ( key = [kenumerator nextObject] ) && ( value = [enumerator nextObject] ) ) {
		NSScriptObjectSpecifier *specifier = nil;
		if( [value isKindOfClass:[NSScriptObjectSpecifier class]] ) specifier = value;
		else specifier = [value objectSpecifier];

		if( specifier ) descriptor = [[value objectSpecifier] _asDescriptor]; // custom object, use it's object specitier
		else descriptor = [[NSAEDescriptorTranslator sharedAEDescriptorTranslator] descriptorByTranslatingObject:value ofType:nil inSuite:nil];

		if( ! descriptor ) descriptor = [NSAppleEventDescriptor nullDescriptor];
		[event setDescriptor:descriptor forKeyword:[key fourCharCode]];
	}

	NSDictionary *error = nil;
	NSAppleEventDescriptor *result = [_script executeAppleEvent:event error:&error];
	if( error && ! result ) { // an error
		int code = [[error objectForKey:NSAppleScriptErrorNumber] intValue];
		if( code == errAEEventNotHandled || code == errAEHandlerNotFound )
			[self doesNotRespondToSelector:selector]; // disable for future calls
		return [NSError errorWithDomain:NSOSStatusErrorDomain code:code userInfo:error];
	}

	if( [result descriptorType] == 'obj ' ) { // an object specifier result, evaluate it to the object
		NSScriptObjectSpecifier *specifier = [NSScriptObjectSpecifier _objectSpecifierFromDescriptor:result inCommandConstructionContext:nil];
		return [specifier objectsByEvaluatingSpecifier];
	}

	// a static result evaluate it to the proper object
	return [[NSAEDescriptorTranslator sharedAEDescriptorTranslator] objectByTranslatingDescriptor:result toType:nil inSuite:nil];
}

#pragma mark -

- (BOOL) respondsToSelector:(SEL) selector {
	if( ! _script || [_doseNotRespond containsObject:NSStringFromSelector( selector )] ) return NO;
	return [super respondsToSelector:selector];
}

- (void) doesNotRespondToSelector:(SEL) selector {
	[_doseNotRespond addObject:NSStringFromSelector( selector )];
}
@end