// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "../../include/javascript/JavaScript.h"
#include "../../include/javascript/IJavaScript.h"
#include "../../include/javascript/JS_EventHandler.h"
#include "../../include/javascript/JS_Runtime.h"
#include "../../include/javascript/JS_Context.h"
#include "../../include/javascript/JS_Define.h"
#include "../../include/javascript/JS_Object.h"
#include "../../include/javascript/JS_Value.h"
#include "../../include/javascript/Document.h"
#include "../../include/javascript/app.h"
#include "../../include/javascript/color.h"
#include "../../include/javascript/Consts.h"
#include "../../include/javascript/Document.h"
#include "../../include/javascript/event.h"
#include "../../include/javascript/Field.h"
#include "../../include/javascript/Icon.h"
#include "../../include/javascript/PublicMethods.h"
#include "../../include/javascript/report.h"
#include "../../include/javascript/util.h"
#include "../../include/javascript/JS_GlobalData.h"
#include "../../include/javascript/global.h"
#include "../../include/javascript/console.h"

CJS_RuntimeFactory::~CJS_RuntimeFactory()
{
}

IFXJS_Runtime*					CJS_RuntimeFactory::NewJSRuntime(CPDFDoc_Environment* pApp)
{
	if (!m_bInit)
	{
		unsigned int embedderDataSlot = 0;
		if (pApp->GetFormFillInfo()->m_pJsPlatform->version >= 2) {
			embedderDataSlot = pApp->GetFormFillInfo()->m_pJsPlatform->m_v8EmbedderSlot;
                }
		JS_Initial(embedderDataSlot);
		m_bInit = TRUE;
	}
	return new CJS_Runtime(pApp);
}
void							CJS_RuntimeFactory::AddRef()
{
	//to do.Should be implemented as atom manipulation.
	m_nRef++;
}
void							CJS_RuntimeFactory::Release()
{
	if(m_bInit)
	{
		//to do.Should be implemented as atom manipulation.
		if (--m_nRef == 0)
		{
			JS_Release();
			ReleaseGlobalData();
			m_bInit = FALSE;
		}
	}
}

void							CJS_RuntimeFactory::DeleteJSRuntime(IFXJS_Runtime* pRuntime)
{
	if(pRuntime)
		delete (CJS_Runtime*)pRuntime;
}

CJS_GlobalData*	CJS_RuntimeFactory::NewGlobalData(CPDFDoc_Environment* pApp)
{
	if (m_pGlobalData)
	{
		m_nGlobalDataCount++;
		return m_pGlobalData;
	}
	else
	{
		m_nGlobalDataCount = 1;
		m_pGlobalData = new CJS_GlobalData(pApp);
		return m_pGlobalData;
	}
}

void CJS_RuntimeFactory::ReleaseGlobalData()
{
	m_nGlobalDataCount--;

	if (m_nGlobalDataCount <= 0)
	{
 		delete m_pGlobalData;
 		m_pGlobalData = NULL;
	}
}

void* CJS_ArrayBufferAllocator::Allocate(size_t length) {
    return calloc(1, length);
}

void* CJS_ArrayBufferAllocator::AllocateUninitialized(size_t length) {
    return malloc(length);
}

void CJS_ArrayBufferAllocator::Free(void* data, size_t length) {
    free(data);
}

/* ------------------------------ CJS_Runtime ------------------------------ */

CJS_Runtime::CJS_Runtime(CPDFDoc_Environment * pApp) :
	m_pApp(pApp),
	m_pDocument(NULL),
	m_bBlocking(FALSE),
	m_bRegistered(FALSE),
	m_pFieldEventPath(NULL),
        m_isolate(NULL)
{
	if (m_pApp->GetFormFillInfo()->m_pJsPlatform->version >= 2) {
		m_isolate = reinterpret_cast<v8::Isolate*>(m_pApp->GetFormFillInfo()->m_pJsPlatform->m_isolate);
	}
	if (!m_isolate) {
		m_pArrayBufferAllocator.reset(new CJS_ArrayBufferAllocator());

		v8::Isolate::CreateParams params;
		params.array_buffer_allocator = m_pArrayBufferAllocator.get();
		m_isolate = v8::Isolate::New(params);
        }

	InitJSObjects();

	CJS_Context * pContext = (CJS_Context*)NewContext();
	JS_InitialRuntime(*this, this, pContext, m_context);
	ReleaseContext(pContext);
}

CJS_Runtime::~CJS_Runtime()
{
	for (int i=0, sz=m_ContextArray.GetSize(); i<sz; i++)
		delete m_ContextArray.GetAt(i);

	m_ContextArray.RemoveAll();

	JS_ReleaseRuntime(*this, m_context);

	RemoveEventsInLoop(m_pFieldEventPath);

	m_pApp = NULL;
	m_pDocument = NULL;
	m_pFieldEventPath = NULL;
	m_context.Reset();

	//m_isolate->Exit();
	m_isolate->Dispose();
}

FX_BOOL CJS_Runtime::InitJSObjects()
{
	v8::Isolate::Scope isolate_scope(GetIsolate());
	v8::HandleScope handle_scope(GetIsolate());
	v8::Local<v8::Context> context = v8::Context::New(GetIsolate());
	v8::Context::Scope context_scope(context);
	//0 - 8
	if (CJS_Border::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_Display::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_Font::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_Highlight::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_Position::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_ScaleHow::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_ScaleWhen::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_Style::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_Zoomtype::Init(*this, JS_STATIC) < 0) return FALSE;

	//9 - 11
	if (CJS_App::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_Color::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_Console::Init(*this, JS_STATIC) < 0) return FALSE;

	//12 - 14
	if (CJS_Document::Init(*this, JS_DYNAMIC) < 0) return FALSE;
	if (CJS_Event::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_Field::Init(*this, JS_DYNAMIC) < 0) return FALSE;

	//15 - 17
	if (CJS_Global::Init(*this, JS_STATIC) < 0) return FALSE;
	if (CJS_Icon::Init(*this, JS_DYNAMIC) < 0) return FALSE;
	if (CJS_Util::Init(*this, JS_STATIC) < 0) return FALSE;

	if (CJS_PublicMethods::Init(*this) < 0) return FALSE;
	if (CJS_GlobalConsts::Init(*this) < 0) return FALSE;
	if (CJS_GlobalArrays::Init(*this) < 0) return FALSE;

	if (CJS_TimerObj::Init(*this, JS_DYNAMIC) < 0) return FALSE;
	if (CJS_PrintParamsObj::Init(*this, JS_DYNAMIC) <0) return FALSE;

	return TRUE;
}

IFXJS_Context* CJS_Runtime::NewContext()
{
	CJS_Context * p = new CJS_Context(this);
	m_ContextArray.Add(p);
	return p;
}

void CJS_Runtime::ReleaseContext(IFXJS_Context * pContext)
{
	CJS_Context* pJSContext = (CJS_Context*)pContext;

	for (int i=0, sz=m_ContextArray.GetSize(); i<sz; i++)
	{
		if (pJSContext == m_ContextArray.GetAt(i))
		{
			delete pJSContext;
			m_ContextArray.RemoveAt(i);
			break;
		}
	}
}

IFXJS_Context*	CJS_Runtime::GetCurrentContext()
{
	if(!m_ContextArray.GetSize())
		return NULL;
	return m_ContextArray.GetAt(m_ContextArray.GetSize()-1);
}

void CJS_Runtime::SetReaderDocument(CPDFSDK_Document* pReaderDoc)
{
	if (m_pDocument != pReaderDoc)
	{
		v8::Isolate::Scope isolate_scope(m_isolate);
		v8::HandleScope handle_scope(m_isolate);
		v8::Local<v8::Context> context =v8::Local<v8::Context>::New(m_isolate, m_context);
		v8::Context::Scope context_scope(context);

		m_pDocument = pReaderDoc;

		if (pReaderDoc)
		{
			JSObject pThis = JS_GetThisObj(*this);
			if(!pThis.IsEmpty())
			{
				if (JS_GetObjDefnID(pThis) == JS_GetObjDefnID(*this, L"Document"))
				{
					if (CJS_Document* pJSDocument = (CJS_Document*)JS_GetPrivate(pThis))
					{
						if (Document * pDocument = (Document*)pJSDocument->GetEmbedObject())
							pDocument->AttachDoc(pReaderDoc);
					}
				}
			}
			JS_SetThisObj(*this, JS_GetObjDefnID(*this, L"Document"));
		}
		else
		{
			JS_SetThisObj(*this, JS_GetObjDefnID(*this, L"app"));
		}
	}
}

FX_BOOL	CJS_Runtime::AddEventToLoop(const CFX_WideString& sTargetName, JS_EVENT_T eEventType)
{
	if (m_pFieldEventPath == NULL)
	{
		m_pFieldEventPath = new CJS_FieldEvent;
		m_pFieldEventPath->sTargetName = sTargetName;
		m_pFieldEventPath->eEventType = eEventType;
		m_pFieldEventPath->pNext = NULL;

		return TRUE;
	}

	//to search
	CJS_FieldEvent* p = m_pFieldEventPath;
	CJS_FieldEvent* pLast = m_pFieldEventPath;
	while (p)
	{
		if (p->eEventType == eEventType && p->sTargetName == sTargetName)
			return FALSE;

		pLast = p;
		p = p->pNext;
	}

	//to add
	CJS_FieldEvent* pNew = new CJS_FieldEvent;
	pNew->sTargetName = sTargetName;
	pNew->eEventType = eEventType;
	pNew->pNext = NULL;

	pLast->pNext = pNew;

	return TRUE;
}

void CJS_Runtime::RemoveEventInLoop(const CFX_WideString& sTargetName, JS_EVENT_T eEventType)
{
	FX_BOOL bFind = FALSE;

	CJS_FieldEvent* p = m_pFieldEventPath;
	CJS_FieldEvent* pLast = NULL;
	while (p)
	{
		if (p->eEventType == eEventType && p->sTargetName == sTargetName)
		{
			bFind = TRUE;
			break;
		}

		pLast = p;
		p = p->pNext;
	}

	if (bFind)
	{
		RemoveEventsInLoop(p);

		if (p == m_pFieldEventPath)
			m_pFieldEventPath = NULL;

		if (pLast)
			pLast->pNext = NULL;
	}
}

void CJS_Runtime::RemoveEventsInLoop(CJS_FieldEvent* pStart)
{
	CJS_FieldEvent* p = pStart;

	while (p)
	{
		CJS_FieldEvent* pOld = p;
		p = pOld->pNext;

		delete pOld;
	}
}

v8::Local<v8::Context>	CJS_Runtime::NewJSContext()
{
	return v8::Local<v8::Context>::New(m_isolate, m_context);
}

CFX_WideString ChangeObjName(const CFX_WideString& str)
{
	CFX_WideString sRet = str;
	sRet.Replace(L"_", L".");
	return sRet;
}