/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#include "CCUserDefault.h"
#include "platform/CCFileUtils.h"

//#if (CC_TARGET_PLATFORM == CC_PLATFORM_LINUX)
#include <libxml/parser.h>
#include <libxml/tree.h>
//#else
//#include <libxml/parser.h>
//#include <libxml/tree.h>
//#endif


// root name of xml
#define USERDEFAULT_ROOT_NAME	"userDefaultRoot"

#define XML_FILE_NAME "UserDefault.xml"

using namespace std;

NS_CC_BEGIN;

static xmlDocPtr g_sharedDoc = NULL;

/**
 * define the functions here because we don't want to
 * export xmlNodePtr and other types in "CCUserDefault.h"
 */

static xmlNodePtr getXMLNodeForKey(const char* pKey, xmlNodePtr *rootNode)
{
	xmlNodePtr curNode = NULL;

	// check the key value
	if (! pKey)
	{
		return NULL;
	}

	do 
	{
		// get root node
		*rootNode = xmlDocGetRootElement(g_sharedDoc);
		if (NULL == *rootNode)
		{
			CCLOG("read root node error");
			break;
		}

		// find the node
		curNode = (*rootNode)->xmlChildrenNode;
		while (NULL != curNode)
		{
			if (! xmlStrcmp(curNode->name, BAD_CAST pKey))
			{
				break;
			}

			curNode = curNode->next;
		}
	} while (0);

	return curNode;
}

static inline const char* getValueForKey(const char* pKey)
{
	const char* ret = NULL;
	xmlNodePtr rootNode;
	xmlNodePtr node = getXMLNodeForKey(pKey, &rootNode);

	// find the node
	if (node)
	{
		ret = (const char*)xmlNodeGetContent(node);
	}

	return ret;
}

static void setValueForKey(const char* pKey, const char* pValue)
{
	xmlNodePtr rootNode;
	xmlNodePtr node;

	// check the params
	if (! pKey || ! pValue)
	{
		return;
	}

	// find the node
	node = getXMLNodeForKey(pKey, &rootNode);

	// if node exist, change the content
	if (node)
	{
		xmlNodeSetContent(node, BAD_CAST pValue);
	}
	else
	{
		if (rootNode)
		{
			// the node doesn't exist, add a new one
			// libxml in android donesn't support xmlNewTextChild, so use this approach
			xmlNodePtr tmpNode = xmlNewNode(NULL, BAD_CAST pKey);
			xmlNodePtr content = xmlNewText(BAD_CAST pValue);
			xmlAddChild(rootNode, tmpNode);
			xmlAddChild(tmpNode, content);
		}	
	}
}

/**
 * implements of CCUserDefault
 */

CCUserDefault* CCUserDefault::m_spUserDefault = 0;
string CCUserDefault::m_sFilePath = string("");
bool CCUserDefault::m_sbIsFilePathInitialized = false;

/**
 * If the user invoke delete CCUserDefault::sharedUserDefault(), should set m_spUserDefault
 * to null to avoid error when he invoke CCUserDefault::sharedUserDefault() later.
 */
CCUserDefault::~CCUserDefault()
{
	flush();
	if (g_sharedDoc)
	{
		xmlFreeDoc(g_sharedDoc);
		g_sharedDoc = NULL;
	}

	m_spUserDefault = NULL;
}

CCUserDefault::CCUserDefault()
{
	g_sharedDoc = xmlReadFile(getXMLFilePath().c_str(), "utf-8", XML_PARSE_RECOVER);
}

void CCUserDefault::purgeSharedUserDefault()
{
	CC_SAFE_DELETE(m_spUserDefault);
	m_spUserDefault = NULL;
}

bool CCUserDefault::getBoolForKey(const char* pKey, bool defaultValue)
{
	const char* value = getValueForKey(pKey);
	bool ret = defaultValue;

	if (value)
	{
		ret = (! strcmp(value, "true"));
		xmlFree((void*)value);
	}

	return ret;
}

int CCUserDefault::getIntegerForKey(const char* pKey, int defaultValue)
{
	const char* value = getValueForKey(pKey);
	int ret = defaultValue;

	if (value)
	{
		ret = atoi(value);
		xmlFree((void*)value);
	}

	return ret;
}

float CCUserDefault::getFloatForKey(const char* pKey, float defaultValue)
{
	float ret = (float)getDoubleForKey(pKey, (double)defaultValue);
 
	return ret;
}

double CCUserDefault::getDoubleForKey(const char* pKey, double defaultValue)
{
	const char* value = getValueForKey(pKey);
	double ret = defaultValue;

	if (value)
	{
		ret = atof(value);
		xmlFree((void*)value);
	}

	return ret;
}

string CCUserDefault::getStringForKey(const char* pKey, const std::string & defaultValue)
{
	const char* value = getValueForKey(pKey);
	string ret = defaultValue;

	if (value)
	{
		ret = string(value);
		xmlFree((void*)value);
	}

	return ret;
}

void CCUserDefault::setBoolForKey(const char* pKey, bool value)
{
    // save bool value as sring

	if (true == value)
	{
		setStringForKey(pKey, "true");
	}
	else
	{
		setStringForKey(pKey, "false");
	}
}

void CCUserDefault::setIntegerForKey(const char* pKey, int value)
{
	// check key
	if (! pKey)
	{
		return;
	}

	// format the value
	char tmp[50];
	memset(tmp, 0, 50);
	sprintf(tmp, "%d", value);

	setValueForKey(pKey, tmp);
}

void CCUserDefault::setFloatForKey(const char* pKey, float value)
{
	setDoubleForKey(pKey, value);
}

void CCUserDefault::setDoubleForKey(const char* pKey, double value)
{
	// check key
	if (! pKey)
	{
		return;
	}

	// format the value
    char tmp[50];
	memset(tmp, 0, 50);
	sprintf(tmp, "%f", value);

	setValueForKey(pKey, tmp);
}

void CCUserDefault::setStringForKey(const char* pKey, const std::string & value)
{
	// check key
	if (! pKey)
	{
		return;
	}

	setValueForKey(pKey, value.c_str());
}

CCUserDefault* CCUserDefault::sharedUserDefault()
{
	initXMLFilePath();

	// only create xml file one time
	// the file exists after the programe exit
	if ((! isXMLFileExist()) && (! createXMLFile()))
	{
		return NULL;
	}

	if (! m_spUserDefault)
	{
		m_spUserDefault = new CCUserDefault();
	}

	return m_spUserDefault;
}

bool CCUserDefault::isXMLFileExist()
{
	FILE *fp = fopen(m_sFilePath.c_str(), "r");
	bool bRet = false;

	if (fp)
	{
		bRet = true;
		fclose(fp);
	}

	return bRet;
}

void CCUserDefault::initXMLFilePath()
{
	if (! m_sbIsFilePathInitialized)
	{
		m_sFilePath += CCFileUtils::getWriteablePath() + XML_FILE_NAME;
		m_sbIsFilePathInitialized = true;
	}	
}

// create new xml file
bool CCUserDefault::createXMLFile()
{
	bool bRet = false;
	xmlDocPtr doc = NULL;

	do 
	{
		// new doc
		doc = xmlNewDoc(BAD_CAST"1.0");
		if (doc == NULL)
		{
			CCLOG("can not create xml doc");
			break;
		}

		// new root node
		xmlNodePtr rootNode = xmlNewNode(NULL, BAD_CAST USERDEFAULT_ROOT_NAME);
		if (rootNode == NULL)
		{
			CCLOG("can not create root node");
			break;
		}

		// set root node
		xmlDocSetRootElement(doc, rootNode);

		// save xml file
		xmlSaveFile(m_sFilePath.c_str(), doc);

		bRet = true;
	} while (0);

	// if doc is not null, free it
	if (doc)
	{
		xmlFreeDoc(doc);
	}

	return bRet;
}

const string& CCUserDefault::getXMLFilePath()
{
	return m_sFilePath;
}

void CCUserDefault::flush()
{
	// save to file
	if (g_sharedDoc)
	{
		xmlSaveFile(CCUserDefault::sharedUserDefault()->getXMLFilePath().c_str(), g_sharedDoc);
	}
}

NS_CC_END;