/****************************************************************************
Copyright (c) 2010-2013 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
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

#include "CCFileUtils.h"
#include "CCDirector.h"
#include "CCDictionary.h"
#include "CCString.h"
#include "CCSAXParser.h"
#include "tinyxml2.h"
#include "unzip.h"
#include <stack>

using namespace std;

#if (CC_TARGET_PLATFORM != CC_PLATFORM_IOS) && (CC_TARGET_PLATFORM != CC_PLATFORM_MAC)

NS_CC_BEGIN

typedef enum 
{
    SAX_NONE = 0,
    SAX_KEY,
    SAX_DICT,
    SAX_INT,
    SAX_REAL,
    SAX_STRING,
    SAX_ARRAY
}SAXState;

typedef enum
{
    SAX_RESULT_NONE = 0,
    SAX_RESULT_DICT,
    SAX_RESULT_ARRAY
}SAXResult;

class DictMaker : public SAXDelegator
{
public:
    SAXResult _resultType;
    Array* _rootArray;
    Dictionary *_rootDict;
    Dictionary *_curDict;
    std::stack<Dictionary*> _dictStack;
    std::string _curKey;   ///< parsed key
    std::string _curValue; // parsed value
    SAXState _state;
    Array* _array;

    std::stack<Array*> _arrayStack;
    std::stack<SAXState>  _stateStack;

public:
    DictMaker()        
        : _resultType(SAX_RESULT_NONE),
          _rootArray(NULL), 
          _rootDict(NULL),
          _curDict(NULL),
          _state(SAX_NONE),
          _array(NULL)
    {
    }

    ~DictMaker()
    {
    }

    Dictionary* dictionaryWithContentsOfFile(const char *pFileName)
    {
        _resultType = SAX_RESULT_DICT;
        SAXParser parser;

        if (false == parser.init("UTF-8"))
        {
            return NULL;
        }
        parser.setDelegator(this);

        parser.parse(pFileName);
        return _rootDict;
    }

    Array* arrayWithContentsOfFile(const char* pFileName)
    {
        _resultType = SAX_RESULT_ARRAY;
        SAXParser parser;

        if (false == parser.init("UTF-8"))
        {
            return NULL;
        }
        parser.setDelegator(this);

        parser.parse(pFileName);
        return _array;
    }

    void startElement(void *ctx, const char *name, const char **atts)
    {
        CC_UNUSED_PARAM(ctx);
        CC_UNUSED_PARAM(atts);
        std::string sName((char*)name);
        if( sName == "dict" )
        {
            _curDict = new Dictionary();
            if(_resultType == SAX_RESULT_DICT && _rootDict == NULL)
            {
                // Because it will call _curDict->release() later, so retain here.
                _rootDict = _curDict;
                _rootDict->retain();
            }
            _state = SAX_DICT;

            SAXState preState = SAX_NONE;
            if (! _stateStack.empty())
            {
                preState = _stateStack.top();
            }

            if (SAX_ARRAY == preState)
            {
                // add the dictionary into the array
                _array->addObject(_curDict);
            }
            else if (SAX_DICT == preState)
            {
                // add the dictionary into the pre dictionary
                CCASSERT(! _dictStack.empty(), "The state is wrong!");
                Dictionary* pPreDict = _dictStack.top();
                pPreDict->setObject(_curDict, _curKey.c_str());
            }

            _curDict->release();

            // record the dict state
            _stateStack.push(_state);
            _dictStack.push(_curDict);
        }
        else if(sName == "key")
        {
            _state = SAX_KEY;
        }
        else if(sName == "integer")
        {
            _state = SAX_INT;
        }
        else if(sName == "real")
        {
            _state = SAX_REAL;
        }
        else if(sName == "string")
        {
            _state = SAX_STRING;
        }
        else if (sName == "array")
        {
            _state = SAX_ARRAY;
            _array = new Array();
            _array->init();
            if (_resultType == SAX_RESULT_ARRAY && _rootArray == NULL)
            {
                _rootArray = _array;
                _rootArray->retain();
            }
            SAXState preState = SAX_NONE;
            if (! _stateStack.empty())
            {
                preState = _stateStack.top();
            }

            if (preState == SAX_DICT)
            {
                _curDict->setObject(_array, _curKey.c_str());
            }
            else if (preState == SAX_ARRAY)
            {
                CCASSERT(! _arrayStack.empty(), "The state is wrong!");
                Array* pPreArray = _arrayStack.top();
                pPreArray->addObject(_array);
            }
            _array->release();
            // record the array state
            _stateStack.push(_state);
            _arrayStack.push(_array);
        }
        else
        {
            _state = SAX_NONE;
        }
    }

    void endElement(void *ctx, const char *name)
    {
        CC_UNUSED_PARAM(ctx);
        SAXState curState = _stateStack.empty() ? SAX_DICT : _stateStack.top();
        std::string sName((char*)name);
        if( sName == "dict" )
        {
            _stateStack.pop();
            _dictStack.pop();
            if ( !_dictStack.empty())
            {
                _curDict = _dictStack.top();
            }
        }
        else if (sName == "array")
        {
            _stateStack.pop();
            _arrayStack.pop();
            if (! _arrayStack.empty())
            {
                _array = _arrayStack.top();
            }
        }
        else if (sName == "true")
        {
            String *str = new String("1");
            if (SAX_ARRAY == curState)
            {
                _array->addObject(str);
            }
            else if (SAX_DICT == curState)
            {
                _curDict->setObject(str, _curKey.c_str());
            }
            str->release();
        }
        else if (sName == "false")
        {
            String *str = new String("0");
            if (SAX_ARRAY == curState)
            {
                _array->addObject(str);
            }
            else if (SAX_DICT == curState)
            {
                _curDict->setObject(str, _curKey.c_str());
            }
            str->release();
        }
        else if (sName == "string" || sName == "integer" || sName == "real")
        {
            String* pStrValue = new String(_curValue);

            if (SAX_ARRAY == curState)
            {
                _array->addObject(pStrValue);
            }
            else if (SAX_DICT == curState)
            {
                _curDict->setObject(pStrValue, _curKey.c_str());
            }

            pStrValue->release();
            _curValue.clear();
        }
        
        _state = SAX_NONE;
    }

    void textHandler(void *ctx, const char *ch, int len)
    {
        CC_UNUSED_PARAM(ctx);
        if (_state == SAX_NONE)
        {
            return;
        }

        SAXState curState = _stateStack.empty() ? SAX_DICT : _stateStack.top();
        String *pText = new String(std::string((char*)ch,0,len));

        switch(_state)
        {
        case SAX_KEY:
            _curKey = pText->getCString();
            break;
        case SAX_INT:
        case SAX_REAL:
        case SAX_STRING:
            {
                if (curState == SAX_DICT)
                {
                    CCASSERT(!_curKey.empty(), "key not found : <integer/real>");
                }
                
                _curValue.append(pText->getCString());
            }
            break;
        default:
            break;
        }
        pText->release();
    }
};

Dictionary* FileUtils::createDictionaryWithContentsOfFile(const std::string& filename)
{
    std::string fullPath = fullPathForFilename(filename.c_str());
    DictMaker tMaker;
    return tMaker.dictionaryWithContentsOfFile(fullPath.c_str());
}

Array* FileUtils::createArrayWithContentsOfFile(const std::string& filename)
{
    std::string fullPath = fullPathForFilename(filename.c_str());
    DictMaker tMaker;
    return tMaker.arrayWithContentsOfFile(fullPath.c_str());
}


/*
 * forward statement
 */
static tinyxml2::XMLElement* generateElementForArray(cocos2d::Array *array, tinyxml2::XMLDocument *pDoc);
static tinyxml2::XMLElement* generateElementForDict(cocos2d::Dictionary *dict, tinyxml2::XMLDocument *pDoc);

/*
 * Use tinyxml2 to write plist files
 */
bool FileUtils::writeToFile(cocos2d::Dictionary *dict, const std::string &fullPath)
{
    //CCLOG("tinyxml2 Dictionary %d writeToFile %s", dict->_ID, fullPath.c_str());
    tinyxml2::XMLDocument *pDoc = new tinyxml2::XMLDocument();
    if (NULL == pDoc)
        return false;
    
    tinyxml2::XMLDeclaration *pDeclaration = pDoc->NewDeclaration("xml version=\"1.0\" encoding=\"UTF-8\"");
    if (NULL == pDeclaration)
    {
        delete pDoc;
        return false;
    }
    
    pDoc->LinkEndChild(pDeclaration);
    tinyxml2::XMLElement *docType = pDoc->NewElement("!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\"");
    pDoc->LinkEndChild(docType);
    
    tinyxml2::XMLElement *pRootEle = pDoc->NewElement("plist");
    pRootEle->SetAttribute("version", "1.0");
    if (NULL == pRootEle)
    {
        delete pDoc;
        return false;
    }
    pDoc->LinkEndChild(pRootEle);
    
    tinyxml2::XMLElement *innerDict = generateElementForDict(dict, pDoc);
    if (NULL == innerDict )
    {
        delete pDoc;
        return false;
    }
    pRootEle->LinkEndChild(innerDict);
    
    bool bRet = tinyxml2::XML_SUCCESS == pDoc->SaveFile(fullPath.c_str());
    
    delete pDoc;
    return bRet;
}

/*
 * Generate tinyxml2::XMLElement for Object through a tinyxml2::XMLDocument
 */
static tinyxml2::XMLElement* generateElementForObject(cocos2d::Object *object, tinyxml2::XMLDocument *pDoc)
{
    // object is String
    if (String *str = dynamic_cast<String *>(object))
    {
        tinyxml2::XMLElement* node = pDoc->NewElement("string");
        tinyxml2::XMLText* content = pDoc->NewText(str->getCString());
        node->LinkEndChild(content);
        return node;
    }
    
    // object is Array
    if (Array *array = dynamic_cast<Array *>(object))
        return generateElementForArray(array, pDoc);
    
    // object is Dictionary
    if (Dictionary *innerDict = dynamic_cast<Dictionary *>(object))
        return generateElementForDict(innerDict, pDoc);
    
    CCLOG("This type cannot appear in property list");
    return NULL;
}

/*
 * Generate tinyxml2::XMLElement for Dictionary through a tinyxml2::XMLDocument
 */
static tinyxml2::XMLElement* generateElementForDict(cocos2d::Dictionary *dict, tinyxml2::XMLDocument *pDoc)
{
    tinyxml2::XMLElement* rootNode = pDoc->NewElement("dict");
    
    DictElement *dictElement = NULL;
    CCDICT_FOREACH(dict, dictElement)
    {
        tinyxml2::XMLElement* tmpNode = pDoc->NewElement("key");
        rootNode->LinkEndChild(tmpNode);
        tinyxml2::XMLText* content = pDoc->NewText(dictElement->getStrKey());
        tmpNode->LinkEndChild(content);
        
        Object *object = dictElement->getObject();
        tinyxml2::XMLElement *element = generateElementForObject(object, pDoc);
        if (element)
            rootNode->LinkEndChild(element);
    }
    return rootNode;
}

/*
 * Generate tinyxml2::XMLElement for Array through a tinyxml2::XMLDocument
 */
static tinyxml2::XMLElement* generateElementForArray(cocos2d::Array *array, tinyxml2::XMLDocument *pDoc)
{
    tinyxml2::XMLElement* rootNode = pDoc->NewElement("array");
    
    Object *object = NULL;
    CCARRAY_FOREACH(array, object)
    {
        tinyxml2::XMLElement *element = generateElementForObject(object, pDoc);
        if (element)
            rootNode->LinkEndChild(element);
    }
    return rootNode;
}


#else
NS_CC_BEGIN

/* The subclass FileUtilsApple should override these two method. */
Dictionary* FileUtils::createDictionaryWithContentsOfFile(const std::string& filename) {return NULL;}
bool FileUtils::writeToFile(cocos2d::Dictionary *dict, const std::string &fullPath) {return false;}
Array* FileUtils::createArrayWithContentsOfFile(const std::string& filename) {return NULL;}

#endif /* (CC_TARGET_PLATFORM != CC_PLATFORM_IOS) && (CC_TARGET_PLATFORM != CC_PLATFORM_MAC) */


FileUtils* FileUtils::s_sharedFileUtils = NULL;


void FileUtils::destroyInstance()
{
    CC_SAFE_DELETE(s_sharedFileUtils);
}

FileUtils::FileUtils()
: _filenameLookupDict(NULL)
{
}

FileUtils::~FileUtils()
{
    CC_SAFE_RELEASE(_filenameLookupDict);
}


bool FileUtils::init()
{
    _searchPathArray.push_back(_defaultResRootPath);
    _searchResolutionsOrderArray.push_back("");
    return true;
}

void FileUtils::purgeCachedEntries()
{
    _fullPathCache.clear();
}

unsigned char* FileUtils::getFileData(const char* filename, const char* mode, long *size)
{
    unsigned char * buffer = NULL;
    CCASSERT(filename != NULL && size != NULL && mode != NULL, "Invalid parameters.");
    *size = 0;
    do
    {
        // read the file from hardware
        std::string fullPath = fullPathForFilename(filename);
        FILE *fp = fopen(fullPath.c_str(), mode);
        CC_BREAK_IF(!fp);
        
        fseek(fp,0,SEEK_END);
        *size = ftell(fp);
        fseek(fp,0,SEEK_SET);
        buffer = new unsigned char[*size];
        *size = fread(buffer,sizeof(unsigned char), *size,fp);
        fclose(fp);
    } while (0);
    
    if (! buffer)
    {
        std::string msg = "Get data from file(";
        msg.append(filename).append(") failed!");
        
        CCLOG("%s", msg.c_str());
    }
    return buffer;
}

unsigned char* FileUtils::getFileDataFromZip(const char* zipFilePath, const char* filename, long *size)
{
    unsigned char * buffer = NULL;
    unzFile pFile = NULL;
    *size = 0;

    do 
    {
        CC_BREAK_IF(!zipFilePath || !filename);
        CC_BREAK_IF(strlen(zipFilePath) == 0);

        pFile = unzOpen(zipFilePath);
        CC_BREAK_IF(!pFile);

        int nRet = unzLocateFile(pFile, filename, 1);
        CC_BREAK_IF(UNZ_OK != nRet);

        char szFilePathA[260];
        unz_file_info FileInfo;
        nRet = unzGetCurrentFileInfo(pFile, &FileInfo, szFilePathA, sizeof(szFilePathA), NULL, 0, NULL, 0);
        CC_BREAK_IF(UNZ_OK != nRet);

        nRet = unzOpenCurrentFile(pFile);
        CC_BREAK_IF(UNZ_OK != nRet);

        buffer = new unsigned char[FileInfo.uncompressed_size];
        int CC_UNUSED nSize = unzReadCurrentFile(pFile, buffer, FileInfo.uncompressed_size);
        CCASSERT(nSize == 0 || nSize == (int)FileInfo.uncompressed_size, "the file size is wrong");

        *size = FileInfo.uncompressed_size;
        unzCloseCurrentFile(pFile);
    } while (0);

    if (pFile)
    {
        unzClose(pFile);
    }

    return buffer;
}

std::string FileUtils::getNewFilename(const std::string &filename)
{
    std::string newFileName;
    
    // in Lookup Filename dictionary ?
    String* fileNameFound = _filenameLookupDict ? (String*)_filenameLookupDict->objectForKey(filename) : NULL;
    if( NULL == fileNameFound || fileNameFound->length() == 0) {
        newFileName = filename;
    }
    else {
        newFileName = fileNameFound->getCString();
    }
    return newFileName;
}

std::string FileUtils::getPathForFilename(const std::string& filename, const std::string& resolutionDirectory, const std::string& searchPath)
{
    std::string file = filename;
    std::string file_path = "";
    size_t pos = filename.find_last_of("/");
    if (pos != std::string::npos)
    {
        file_path = filename.substr(0, pos+1);
        file = filename.substr(pos+1);
    }
    
    // searchPath + file_path + resourceDirectory
    std::string path = searchPath;
    path += file_path;
    path += resolutionDirectory;
    
    path = getFullPathForDirectoryAndFilename(path, file);
    
    //CCLOG("getPathForFilename, fullPath = %s", path.c_str());
    return path;
}


std::string FileUtils::fullPathForFilename(const std::string &filename)
{
    if (isAbsolutePath(filename))
    {
        return filename;
    }

    // Already Cached ?
    auto cacheIter = _fullPathCache.find(filename);
    if( cacheIter != _fullPathCache.end() )
    {
        return cacheIter->second;
    }
    
    // Get the new file name.
    std::string newFilename( getNewFilename(filename) );
    
    string fullpath = "";
    
    for (auto searchIt = _searchPathArray.begin(); searchIt != _searchPathArray.end(); ++searchIt) {
        for (auto resolutionIt = _searchResolutionsOrderArray.begin(); resolutionIt != _searchResolutionsOrderArray.end(); ++resolutionIt) {
            
            fullpath = this->getPathForFilename(newFilename, *resolutionIt, *searchIt);
            
            if (fullpath.length() > 0)
            {
                // Using the filename passed in as key.
                _fullPathCache.insert(std::pair<std::string, std::string>(filename, fullpath));
                return fullpath;
            }
        }
    }
    
    CCLOG("cocos2d: fullPathForFilename: No file found at %s. Possible missing file.", filename.c_str());

    // XXX: Should it return nullptr ? or an empty string ?
    // The file wasn't found, return the file name passed in.
    return filename;
}

std::string FileUtils::fullPathFromRelativeFile(const std::string &filename, const std::string &relativeFile)
{
    return relativeFile.substr(0, relativeFile.rfind('/')+1) + getNewFilename(filename);
}

void FileUtils::setSearchResolutionsOrder(const std::vector<std::string>& searchResolutionsOrder)
{
    bool existDefault = false;
    _fullPathCache.clear();
    _searchResolutionsOrderArray.clear();
    for(auto iter = searchResolutionsOrder.begin(); iter != searchResolutionsOrder.end(); ++iter)
    {
        std::string resolutionDirectory = *iter;
        if (!existDefault && resolutionDirectory == "")
        {
            existDefault = true;
        }
        
        if (resolutionDirectory.length() > 0 && resolutionDirectory[resolutionDirectory.length()-1] != '/')
        {
            resolutionDirectory += "/";
        }
        
        _searchResolutionsOrderArray.push_back(resolutionDirectory);
    }
    if (!existDefault)
    {
        _searchResolutionsOrderArray.push_back("");
    }
}

void FileUtils::addSearchResolutionsOrder(const std::string &order)
{
    _searchResolutionsOrderArray.push_back(order);
}

const std::vector<std::string>& FileUtils::getSearchResolutionsOrder()
{
    return _searchResolutionsOrderArray;
}

const std::vector<std::string>& FileUtils::getSearchPaths() const
{
    return _searchPathArray;
}

void FileUtils::setSearchPaths(const std::vector<std::string>& searchPaths)
{
    bool existDefaultRootPath = false;
    
    _fullPathCache.clear();
    _searchPathArray.clear();
    for (auto iter = searchPaths.begin(); iter != searchPaths.end(); ++iter)
    {
        std::string strPrefix;
        std::string path;
        
        if (!isAbsolutePath(*iter))
        { // Not an absolute path
            strPrefix = _defaultResRootPath;
        }
        path = strPrefix + (*iter);
        if (path.length() > 0 && path[path.length()-1] != '/')
        {
            path += "/";
        }
        if (!existDefaultRootPath && path == _defaultResRootPath)
        {
            existDefaultRootPath = true;
        }
        _searchPathArray.push_back(path);
    }
    
    if (!existDefaultRootPath)
    {
        //CCLOG("Default root path doesn't exist, adding it.");
        _searchPathArray.push_back(_defaultResRootPath);
    }
}

void FileUtils::addSearchPath(const std::string &searchpath)
{
    std::string strPrefix;
    if (!isAbsolutePath(searchpath))
        strPrefix = _defaultResRootPath;

    std::string path = strPrefix + searchpath;
    if (path.length() > 0 && path[path.length()-1] != '/')
    {
        path += "/";
    }
    _searchPathArray.push_back(path);
}

void FileUtils::setFilenameLookupDictionary(Dictionary* pFilenameLookupDict)
{
    _fullPathCache.clear();    
    CC_SAFE_RELEASE(_filenameLookupDict);
    _filenameLookupDict = pFilenameLookupDict;
    CC_SAFE_RETAIN(_filenameLookupDict);
}

void FileUtils::loadFilenameLookupDictionaryFromFile(const std::string &filename)
{
    std::string fullPath = fullPathForFilename(filename);
    if (fullPath.length() > 0)
    {
        Dictionary* dict = Dictionary::createWithContentsOfFile(fullPath.c_str());
        if (dict)
        {
            Dictionary* metadata = static_cast<Dictionary*>( dict->objectForKey("metadata") );
            int version = static_cast<String*>( metadata->objectForKey("version"))->intValue();
            if (version != 1)
            {
                CCLOG("cocos2d: ERROR: Invalid filenameLookup dictionary version: %ld. Filename: %s", (long)version, filename.c_str());
                return;
            }
            setFilenameLookupDictionary( static_cast<Dictionary*>( dict->objectForKey("filenames")) );
        }
    }
}

std::string FileUtils::getFullPathForDirectoryAndFilename(const std::string& strDirectory, const std::string& strFilename)
{
    // get directory+filename, safely adding '/' as necessary 
    std::string ret = strDirectory;
    if (strDirectory.size() && strDirectory[strDirectory.size()-1] != '/'){
        ret += '/';
    }
    ret += strFilename;
    
    // if the file doesn't exist, return an empty string
    if (!isFileExist(ret)) {
        ret = "";
    }
    return ret;
}

bool FileUtils::isAbsolutePath(const std::string& strPath) const
{
    return (strPath[0] == '/');
}

//////////////////////////////////////////////////////////////////////////
// Notification support when getFileData from invalid file path.
//////////////////////////////////////////////////////////////////////////
static bool s_popupNotify = true;

void FileUtils::setPopupNotify(bool notify)
{
    s_popupNotify = notify;
}

bool FileUtils::isPopupNotify()
{
    return s_popupNotify;
}

NS_CC_END