#include "precompiled.h"

#include "ScriptingHost.h"
#include "ScriptGlue.h"
#include "CConsole.h"
#include <sstream>
#include <fstream>
#include <iostream>

#ifdef _WIN32
# include "float.h" // <- MT: Just for _finite(), converting certain strings was causing wierd bugs.
# define finite _finite
#else
# define finite __finite // PT: Need to use _finite in MSVC, __finite in gcc
#endif

#ifdef NDEBUG
# pragma comment (lib, "js32.lib")
#else
# pragma comment (lib, "js32d.lib")
#endif

extern CConsole* g_Console;

namespace
{
	const int RUNTIME_MEMORY_ALLOWANCE = 16 * 1024 * 1024;
	const int STACK_CHUNK_SIZE = 16 * 1024;

	JSClass GlobalClass = 
	{
		"global", 0,
		JS_PropertyStub, JS_PropertyStub,
		JS_PropertyStub, JS_PropertyStub,
		JS_EnumerateStub, JS_ResolveStub,
		JS_ConvertStub, JS_FinalizeStub
	};
}

ScriptingHost::ScriptingHost() : m_RunTime(NULL), m_Context(NULL), m_GlobalObject(NULL)
{
    m_RunTime = JS_NewRuntime(RUNTIME_MEMORY_ALLOWANCE);

	if (m_RunTime == NULL)
		throw PSERROR_Scripting_RuntimeCreationFailed();

    m_Context = JS_NewContext(m_RunTime, STACK_CHUNK_SIZE);

	if (m_Context == NULL)
		throw PSERROR_Scripting_ContextCreationFailed();

	JS_SetErrorReporter(m_Context, ScriptingHost::ErrorReporter);

	m_GlobalObject = JS_NewObject(m_Context, &GlobalClass, NULL, NULL);

	if (m_GlobalObject == NULL)
		throw PSERROR_Scripting_GlobalObjectCreationFailed();

	if (JS_InitStandardClasses(m_Context, m_GlobalObject) == JSVAL_FALSE)
		throw PSERROR_Scripting_StandardClassSetupFailed();

	if (JS_DefineFunctions(m_Context, m_GlobalObject, ScriptFunctionTable) == JS_FALSE)
		throw PSERROR_Scripting_NativeFunctionSetupFailed();

	if( JS_DefineProperties( m_Context, m_GlobalObject, ScriptGlobalTable ) == JS_FALSE )
		throw( std::string( "ScriptingHost: Failed to setup native objects" ) );

	std::cout << "Scripting environment initialized" << std::endl;
}

ScriptingHost::~ScriptingHost()
{
	if (m_Context != NULL)
	{
		JS_DestroyContext(m_Context);
		m_Context = NULL;
	}

	if (m_RunTime != NULL)
	{
		JS_DestroyRuntime(m_RunTime);
		m_RunTime = NULL;
	}

	JS_ShutDown();
}

JSContext* ScriptingHost::getContext()
{
	return( m_Context );
}

void ScriptingHost::LoadScriptFromDisk(const std::string & fileName)
{
	std::string script;
	std::string line;

	std::ifstream scriptFile(fileName.c_str());

	if (scriptFile.is_open() == false)
		throw PSERROR_Scripting_LoadFile_OpenFailed();

	while (scriptFile.eof() == false)
	{
		std::getline(scriptFile, line);
		script += line;
		script += '\n';
	}

	jsval rval; 
	JSBool ok = JS_EvaluateScript(m_Context, m_GlobalObject, script.c_str(), (unsigned int)script.length(), fileName.c_str(), 0, &rval); 

    if (ok == JS_FALSE)
		throw PSERROR_Scripting_LoadFile_EvalErrors();
}

jsval ScriptingHost::CallFunction(const std::string & functionName, jsval * params, int numParams)
{
	jsval result;

	JSBool ok = JS_CallFunctionName(m_Context, m_GlobalObject, functionName.c_str(), numParams, params, &result);

	if (ok == JS_FALSE)
		throw PSERROR_Scripting_CallFunctionFailed();

	return result;
}

jsval ScriptingHost::ExecuteScript(const CStrW& script, const CStrW& calledFrom, JSObject* contextObject )
{
	jsval rval; 

	/* Unicode->ASCII conversion (mostly) for calledFrom */

	size_t len = wcstombs( NULL, calledFrom, 0 );
	assert( len != (size_t)-1 );
	char* asciiName = new char[len + 1];
	wcstombs( asciiName, calledFrom, len + 1 );

	JSBool ok = JS_EvaluateUCScript(m_Context, contextObject ? contextObject : m_GlobalObject, script.utf16().c_str(), (int)script.Length(), asciiName, 0, &rval); 

	delete( asciiName );

	if (!ok) return JSVAL_NULL;

	return rval;
}

void ScriptingHost::RegisterFunction(const std::string & functionName, JSNative function, int numArgs)
{
	JSFunction * func = JS_DefineFunction(m_Context, m_GlobalObject, functionName.c_str(), function, numArgs, 0);

	if (func == NULL)
		throw PSERROR_Scripting_RegisterFunctionFailed();
}

void ScriptingHost::DefineConstant(const std::string & name, int value)
{
	// First remove this constant if it already exists
	JS_DeleteProperty(m_Context, m_GlobalObject, name.c_str());

	JSBool ok = JS_DefineProperty(	m_Context, m_GlobalObject, name.c_str(), INT_TO_JSVAL(value), 
									NULL, NULL, JSPROP_READONLY);

	if (ok == JS_FALSE)
		throw PSERROR_Scripting_DefineConstantFailed();
}

void ScriptingHost::DefineConstant(const std::string & name, double value)
{
	// First remove this constant if it already exists
	JS_DeleteProperty(m_Context, m_GlobalObject, name.c_str());

	struct JSConstDoubleSpec spec[2];

	spec[0].name = name.c_str();
	spec[0].dval = value;
	spec[0].flags = JSPROP_READONLY;

	spec[1].name = 0;
	spec[1].dval = 0.0;
	spec[1].flags = 0;

	JSBool ok = JS_DefineConstDoubles(m_Context, m_GlobalObject, spec);

	if (ok == JS_FALSE)
		throw PSERROR_Scripting_DefineConstantFailed();
}

void ScriptingHost::DefineCustomObjectType(JSClass *clasp, JSNative constructor, uintN minArgs, JSPropertySpec *ps, JSFunctionSpec *fs, JSPropertySpec *static_ps, JSFunctionSpec *static_fs)
{
	std::string typeName = clasp->name;

	if (m_CustomObjectTypes.find(typeName) != m_CustomObjectTypes.end())
	{
		// This type already exists
		throw PSERROR_Scripting_DefineType_AlreadyExists();
	}

	JSObject * obj = JS_InitClass(	m_Context, m_GlobalObject, 0, 
									clasp,
									constructor, minArgs,				// Constructor, min args
									ps, fs,								// Properties, methods
									static_ps, static_fs);				// Constructor properties, methods

	if (obj != NULL)
	{
		CustomType type;
		
		type.m_Object = obj;
		type.m_Class = clasp;

		m_CustomObjectTypes[typeName] = type;
	}
	else
	{
		throw PSERROR_Scripting_DefineType_CreationFailed();
	}
}

JSObject * ScriptingHost::CreateCustomObject(const std::string & typeName)
{
	std::map < std::string, CustomType > ::iterator it = m_CustomObjectTypes.find(typeName);

	if (it == m_CustomObjectTypes.end())
		throw PSERROR_Scripting_TypeDoesNotExist();

	return JS_ConstructObject(m_Context, (*it).second.m_Class, (*it).second.m_Object, NULL);

}



void ScriptingHost::SetObjectProperty(JSObject * object, const std::string & propertyName, jsval value)
{
	JS_SetProperty(m_Context, object, propertyName.c_str(), &value);
}

jsval ScriptingHost::GetObjectProperty( JSObject* object, const std::string& propertyName )
{
	jsval vp;
	JS_GetProperty( m_Context, object, propertyName.c_str(), &vp );
	return( vp );
}



void ScriptingHost::SetObjectProperty_Double(JSObject* object, const char* propertyName, double value)
{
	jsdouble* d = JS_NewDouble(m_Context, value);
	if (! d)
		throw PSERROR_Scripting_ConversionFailed();

	jsval v = DOUBLE_TO_JSVAL(d);

	if (! JS_SetProperty(m_Context, object, propertyName, &v))
		throw PSERROR_Scripting_ConversionFailed();
}

double ScriptingHost::GetObjectProperty_Double(JSObject* object, const char* propertyName)
{
	jsval v;
	double d;

	if (! JS_GetProperty(m_Context, object, propertyName, &v))
		throw PSERROR_Scripting_ConversionFailed();
	if (! JS_ValueToNumber(m_Context, v, &d))
		throw PSERROR_Scripting_ConversionFailed();
	return d;
}



void ScriptingHost::SetGlobal(const std::string &globalName, jsval value)
{
	JS_SetProperty(m_Context, m_GlobalObject, globalName.c_str(), &value);
}

jsval ScriptingHost::GetGlobal(const std::string &globalName)
{
	jsval vp;
	JS_GetProperty(m_Context, m_GlobalObject, globalName.c_str(), &vp);
	return vp;
}

int ScriptingHost::ValueToInt(const jsval value)
{
	int32 i = 0;

	JSBool ok = JS_ValueToInt32(m_Context, value, &i);

	if (!ok)
		throw PSERROR_Scripting_ConversionFailed();

	return i;
}

bool ScriptingHost::ValueToBool(const jsval value)
{
	JSBool b;

	JSBool ok = JS_ValueToBoolean(m_Context, value, &b);

	if (!ok)
		throw PSERROR_Scripting_ConversionFailed();

	return b == JS_TRUE;
}

std::string ScriptingHost::ValueToString(const jsval value)
{
	JSString* string = JS_ValueToString(m_Context, value);
	if (string == NULL)
		throw PSERROR_Scripting_ConversionFailed();

	return std::string(JS_GetStringBytes(string), JS_GetStringLength(string));
}

CStrW ScriptingHost::ValueToUCString( const jsval value )
{
	JSString* string = JS_ValueToString(m_Context, value);
	if (string == NULL)
		throw PSERROR_Scripting_ConversionFailed();

	jschar *strptr=JS_GetStringChars(string);
	size_t length=JS_GetStringLength(string);
	return CStrW(std::wstring(strptr, strptr+length));
}

jsval ScriptingHost::UCStringToValue(const utf16string &str)
{
	return STRING_TO_JSVAL(JS_NewUCStringCopyZ(m_Context, str.c_str()));
}

double ScriptingHost::ValueToDouble(const jsval value)
{
	jsdouble d;

	JSBool ok = JS_ValueToNumber(m_Context, value, &d);

	if (ok == JS_FALSE || !finite( d ) )
		throw PSERROR_Scripting_ConversionFailed();

	return d;
}

void ScriptingHost::ErrorReporter(JSContext * context, const char * message, JSErrorReport * report)
{
	UNUSED(context);

	debug_out("%s(%d) : %s\n", report->filename, report->lineno, message);

	if (g_Console)
	{
		if (message)
		{
			g_Console->InsertMessage( L"JavaScript Error (%hs, line %d): %hs", report->filename, report->lineno, message );
		}
		else
			g_Console->InsertMessage( L"JavaScript Error (%hs, line %d): No error message available", report->filename, report->lineno );
	
	}

	if (report->filename != NULL)
	{
		std::cout << report->filename << " (" << report->lineno << ") ";
	}

	if (message != NULL)
	{
		std::cout << message << std::endl;
	}
	else
	{
		std::cout << "No error message available" << std::endl;
	}
}

/*
void ScriptingHost::Tick(float timeElapsed)
{
	if (timeElapsed > 0.2f) timeElapsed = 0.2f;

	for (int i = 0; i < (int)m_DelayedScripts.size(); )
	{
		m_DelayedScripts[i].m_SecondsToExecution -= timeElapsed;

		if (m_DelayedScripts[i].m_SecondsToExecution <= 0.0f)
		{
			this->ExecuteScript(m_DelayedScripts[i].m_FunctionName);
			m_DelayedScripts.erase(m_DelayedScripts.begin() + i);
		}
		else
		{
			i++;
		}
	}
}

void ScriptingHost::AddDelayedScript(const std::string & functionName, float delaySeconds)
{
	m_DelayedScripts.push_back(DelayedScriptExecutor(functionName, delaySeconds));
}
*/

void ScriptingHost::_CollectGarbage()
{
	JS_GC(m_Context);
}