
#include <v8.h>
#include <string>
#include <exception>
#include "scripting.h"
#include "resource.h"
#include "appinfo.h"

using namespace v8;

const char* ToCString( const String::Utf8Value& value )
{
	return *value ? *value : "<string conversion failed>";
}

std::string toString( int v )
{
	char s[128];
	sprintf(s, "%i", v );
	return s;
}

std::string getExceptionMessage( TryCatch* try_catch )
{
	HandleScope handle_scope;
	
	String::Utf8Value exception( try_catch->Exception() );
	const char* exception_string = ToCString(exception);
	v8::Handle<v8::Message> message = try_catch->Message();
	if (message.IsEmpty())
	{
		return exception_string;
	}
	
	String::Utf8Value filename( message->GetScriptResourceName() );
	const char* filename_string = ToCString(filename);
	int linenum = message->GetLineNumber();

	std::string exceptionMessage = filename_string;
	exceptionMessage.append(1, ':');
	exceptionMessage.append(toString(linenum));
	exceptionMessage.append(": ");
	exceptionMessage.append(exception_string);
	exceptionMessage.append(1, '\n');
			
	v8::String::Utf8Value sourceline(message->GetSourceLine());
	const char* sourceline_string = ToCString(sourceline);
	exceptionMessage.append(sourceline_string);
	exceptionMessage.append(1, '\n');
		
	int start = message->GetStartColumn();
	exceptionMessage.append(start, ' ');
	int end = message->GetEndColumn();
	exceptionMessage.append(end-start, '^');
	exceptionMessage.append(1, '\n');
	
	String::Utf8Value stack_trace( try_catch->StackTrace() );
	if (stack_trace.length() > 0)
	{
		const char* stack_trace_string = ToCString(stack_trace);
		exceptionMessage.append(stack_trace_string);
		exceptionMessage.append(1, '\n');
	}

	return exceptionMessage;
}

void ReportException( const char* title, TryCatch* try_catch )
{
	HandleScope handle_scope;
	String::Utf8Value exception( try_catch->Exception() );
	const char* exception_string = ToCString(exception);
	v8::Handle<v8::Message> message = try_catch->Message();
	printf( "%s\n", title );
	if (message.IsEmpty())
	{
		printf( "%s\n", exception_string );
		return;
	}
	
	String::Utf8Value filename( message->GetScriptResourceName() );
	const char* filename_string = ToCString(filename);
	int linenum = message->GetLineNumber();
	printf("%s:%i: %s\n", filename_string, linenum, exception_string);
		
	v8::String::Utf8Value sourceline(message->GetSourceLine());
	const char* sourceline_string = ToCString(sourceline);
	printf("%s\n", sourceline_string);
		
	int start = message->GetStartColumn();
	for (int i = 0; i < start; i++)
	{
		printf(" ");
	}
	int end = message->GetEndColumn();
	for (int i = start; i < end; i++)
	{
		printf("^");
	}
	printf("\n");
	String::Utf8Value stack_trace( try_catch->StackTrace() );
	if (stack_trace.length() > 0)
	{
		const char* stack_trace_string = ToCString(stack_trace);
		printf("%s\n", stack_trace_string);
	}
}

bool ExecuteScript( const std::string& source, const std::string& fileName )
{
	return ExecuteScript( String::New(source.c_str()), String::New(fileName.c_str()) );
}

bool ExecuteScript( Handle<String> source, Handle<String> fileName )
{
	HandleScope handle_scope;
	TryCatch try_catch;

	Handle<Script> script = Script::Compile( source, fileName );
	if ( script.IsEmpty() )
	{
		std::string msg = "An exception occured while compiling the script.\n";
		msg += getExceptionMessage( &try_catch );
		throw std::exception( msg.c_str() );
	}
	
	Handle<Value> result = script->Run();
	if ( result.IsEmpty() )
	{
		std::string msg = "An exception occured while executing the script.\n";
		msg += getExceptionMessage( &try_catch );
		throw std::exception( msg.c_str() );
	}

	if ( result->IsInt32() )
	{
		return result->Int32Value()==0?false:true;
	}	

	return true;
}

Handle<String> ReadFile( const char* fileName )
{
	FILE* f = fopen( fileName, "rb" );
	if ( f == NULL )
	{
		return Handle<String>();
	}

	fseek( f, 0, SEEK_END );
	int size = ftell( f );
	rewind( f );

	char* content = new char[size+1];
	content[size] = '\0';
	for( int i=0; i<size; )
	{
		int red = fread( &content[i], 1, size-i, f );
		i += red;
	}
	fclose(f);

	Handle<String> result = String::New(content, size);
	delete[] content;
	return result;
}

Handle<Value> Include( const Arguments& args )
{
	HandleScope handleScope;

	if ( args.Length() != 1 )
	{
		return ThrowException( String::New("Include has only one argument.") );
	}
	
	String::Utf8Value file(args[0]);
	if ( *file==NULL )
	{
		return ThrowException( String::New("First argument of include must be a string.") );
	}

	Handle<String> source = ReadFile(*file);
	if ( source.IsEmpty() )
	{
		std::string errMsg = "File not found '";
		errMsg += *file;
		errMsg += "'.\n";
		return ThrowException( String::New(errMsg.c_str()) );
	}
	ExecuteScript( source, String::New(*file) );

	return Undefined();
}

Handle<Value> Print( const Arguments& args )
{
	for( int i = 0; i < args.Length(); i++ )
	{
		HandleScope handleScope;
		String::Utf8Value str(args[i]);
		const char* cstr = ToCString(str);
		printf( "%s", cstr );
	}
	return Undefined();
}

Handle<Value> LoadStringFromResourceJS( const Arguments& args )
{
	if ( args.Length() != 1 )
	{
		return ThrowException( v8::String::New("Wrong number of paremeters.") );		
	}
	
	if ( !args[0]->IsString() )
	{
		return ThrowException( v8::String::New("First parameter must be a string.") );
	}

	v8::String::Value resourceName(args[0]);

	TCHAR* t = reinterpret_cast<TCHAR*>(*resourceName);

	return String::New( LoadStringFromResource(t).c_str() );
}

bool ReadAndExecute( char* fileName )
{
	Handle<String> source = ReadFile(fileName);
	if (source.IsEmpty())
	{
		printf("Error: cannot open file '%s'.\n", fileName );
		return false;
	}

	return ExecuteScript( source, String::New(fileName) );
}

Handle<Value> AppInfoPropertyGetter(Local<String> property, const AccessorInfo& info)
{
	String::AsciiValue ascii_property(property);
	std::string s_property = *ascii_property;

	if ( s_property == "AppName" )
	{
		return String::New(APPINFO_APPNAME);
	}
	if ( s_property == "Version" )
	{
		return String::New(APPINFO_VERSION);
	}
	if ( s_property == "Description" )
	{
		return String::New(APPINFO_DESCRIPTION);
	}
	if ( s_property == "Copyright" )
	{
		return String::New(APPINFO_COPYRIGHT);
	}
	return Undefined();	
}