/****************************************************************************
Copyright (c) 2011      Максим Аксенов 
Copyright (c) 2009-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2014 Chukong Technologies Inc.

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 <unordered_map>
#include <sstream>
#include "CCTMXXMLParser.h"
#include "CCTMXTiledMap.h"
#include "ccMacros.h"
#include "platform/CCFileUtils.h"
#include "ZipUtils.h"
#include "base64.h"

using namespace std;

NS_CC_BEGIN

// implementation TMXLayerInfo
TMXLayerInfo::TMXLayerInfo()
: _name("")
, _tiles(nullptr)
, _ownTiles(true)
, _offset(Point::ZERO)
{
}

TMXLayerInfo::~TMXLayerInfo()
{
    CCLOGINFO("deallocing TMXLayerInfo: %p", this);
    if( _ownTiles && _tiles )
    {
        free(_tiles);
        _tiles = nullptr;
    }
}

ValueMap& TMXLayerInfo::getProperties()
{
    return _properties;
}
void TMXLayerInfo::setProperties(ValueMap var)
{
    _properties = var;
}

// implementation TMXTilesetInfo
TMXTilesetInfo::TMXTilesetInfo()
    :_firstGid(0)
    ,_tileSize(Size::ZERO)
    ,_spacing(0)
    ,_margin(0)
    ,_imageSize(Size::ZERO)
{
}

TMXTilesetInfo::~TMXTilesetInfo()
{
    CCLOGINFO("deallocing TMXTilesetInfo: %p", this);
}

Rect TMXTilesetInfo::rectForGID(int gid)
{
    Rect rect;
    rect.size = _tileSize;
    gid &= kFlippedMask;
    gid = gid - _firstGid;
    int max_x = (int)((_imageSize.width - _margin*2 + _spacing) / (_tileSize.width + _spacing));
    //    int max_y = (imageSize.height - margin*2 + spacing) / (tileSize.height + spacing);
    rect.origin.x = (gid % max_x) * (_tileSize.width + _spacing) + _margin;
    rect.origin.y = (gid / max_x) * (_tileSize.height + _spacing) + _margin;
    return rect;
}

// implementation TMXMapInfo

TMXMapInfo * TMXMapInfo::create(const std::string& tmxFile)
{
    TMXMapInfo *ret = new TMXMapInfo();
    if(ret->initWithTMXFile(tmxFile))
    {
        ret->autorelease();
        return ret;
    }
    CC_SAFE_DELETE(ret);
    return nullptr;
}

TMXMapInfo * TMXMapInfo::createWithXML(const std::string& tmxString, const std::string& resourcePath)
{
    TMXMapInfo *ret = new TMXMapInfo();
    if(ret->initWithXML(tmxString, resourcePath))
    {
        ret->autorelease();
        return ret;
    }
    CC_SAFE_DELETE(ret);
    return nullptr;
}

void TMXMapInfo::internalInit(const std::string& tmxFileName, const std::string& resourcePath)
{
    if (tmxFileName.size() > 0)
    {
        _TMXFileName = FileUtils::getInstance()->fullPathForFilename(tmxFileName);
    }
    
    if (resourcePath.size() > 0)
    {
        _resources = resourcePath;
    }
    
    _objectGroups.reserve(4);

    // tmp vars
    _currentString = "";
    _storingCharacters = false;
    _layerAttribs = TMXLayerAttribNone;
    _parentElement = TMXPropertyNone;
    _currentFirstGID = -1;
}
bool TMXMapInfo::initWithXML(const std::string& tmxString, const std::string& resourcePath)
{
    internalInit("", resourcePath);
    return parseXMLString(tmxString);
}

bool TMXMapInfo::initWithTMXFile(const std::string& tmxFile)
{
    internalInit(tmxFile, "");
    return parseXMLFile(_TMXFileName.c_str());
}

TMXMapInfo::TMXMapInfo()
: _mapSize(Size::ZERO)    
, _tileSize(Size::ZERO)
, _layerAttribs(0)
, _storingCharacters(false)
, _currentFirstGID(-1)
, _recordFirstGID(true)
{
}

TMXMapInfo::~TMXMapInfo()
{
    CCLOGINFO("deallocing TMXMapInfo: %p", this);
}

bool TMXMapInfo::parseXMLString(const std::string& xmlString)
{
    size_t len = xmlString.size();
    if (len <= 0)
        return false;

    SAXParser parser;

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

    parser.setDelegator(this);

    return parser.parse(xmlString.c_str(), len);
}

bool TMXMapInfo::parseXMLFile(const std::string& xmlFilename)
{
    SAXParser parser;
    
    if (false == parser.init("UTF-8") )
    {
        return false;
    }
    
    parser.setDelegator(this);

    return parser.parse(FileUtils::getInstance()->fullPathForFilename(xmlFilename).c_str());
}


// the XML parser calls here with all the elements
void TMXMapInfo::startElement(void *ctx, const char *name, const char **atts)
{    
    CC_UNUSED_PARAM(ctx);
    TMXMapInfo *tmxMapInfo = this;
    std::string elementName = (char*)name;
    ValueMap attributeDict;
    if (atts && atts[0])
    {
        for(int i = 0; atts[i]; i += 2) 
        {
            std::string key = (char*)atts[i];
            std::string value = (char*)atts[i+1];
            attributeDict.insert(std::make_pair(key, Value(value)));
        }
    }
    if (elementName == "map")
    {
        std::string version = attributeDict["version"].asString();
        if ( version != "1.0")
        {
            CCLOG("cocos2d: TMXFormat: Unsupported TMX version: %s", version.c_str());
        }
        std::string orientationStr = attributeDict["orientation"].asString();
        if (orientationStr == "orthogonal")
            tmxMapInfo->setOrientation(TMXOrientationOrtho);
        else if (orientationStr  == "isometric")
            tmxMapInfo->setOrientation(TMXOrientationIso);
        else if(orientationStr == "hexagonal")
            tmxMapInfo->setOrientation(TMXOrientationHex);
        else
            CCLOG("cocos2d: TMXFomat: Unsupported orientation: %d", tmxMapInfo->getOrientation());

        Size s;
        s.width = attributeDict["width"].asFloat();
        s.height = attributeDict["height"].asFloat();
        tmxMapInfo->setMapSize(s);

        s.width = attributeDict["tilewidth"].asFloat();
        s.height = attributeDict["tileheight"].asFloat();
        tmxMapInfo->setTileSize(s);

        // The parent element is now "map"
        tmxMapInfo->setParentElement(TMXPropertyMap);
    } 
    else if (elementName == "tileset") 
    {
        // If this is an external tileset then start parsing that
        std::string externalTilesetFilename = attributeDict["source"].asString();
        if (externalTilesetFilename != "")
        {
            // Tileset file will be relative to the map file. So we need to convert it to an absolute path
            if (_TMXFileName.find_last_of("/") != string::npos)
            {
                string dir = _TMXFileName.substr(0, _TMXFileName.find_last_of("/") + 1);
                externalTilesetFilename = dir + externalTilesetFilename;
            }
            else 
            {
                externalTilesetFilename = _resources + "/" + externalTilesetFilename;
            }
            externalTilesetFilename = FileUtils::getInstance()->fullPathForFilename(externalTilesetFilename.c_str());
            
            _currentFirstGID = attributeDict["firstgid"].asInt();
            if (_currentFirstGID < 0)
            {
                _currentFirstGID = 0;
            }
            _recordFirstGID = false;
            
            tmxMapInfo->parseXMLFile(externalTilesetFilename.c_str());
        }
        else
        {
            TMXTilesetInfo *tileset = new TMXTilesetInfo();
            tileset->_name = attributeDict["name"].asString();
            
            if (_recordFirstGID)
            {
                // unset before, so this is tmx file.
                tileset->_firstGid = attributeDict["firstgid"].asInt();
                
                if (tileset->_firstGid < 0)
                {
                    tileset->_firstGid = 0;
                }
            }
            else
            {
                tileset->_firstGid = _currentFirstGID;
                _currentFirstGID = 0;
            }
            
            tileset->_spacing = attributeDict["spacing"].asInt();
            tileset->_margin = attributeDict["margin"].asInt();
            Size s;
            s.width = attributeDict["tilewidth"].asFloat();
            s.height = attributeDict["tileheight"].asFloat();
            tileset->_tileSize = s;

            tmxMapInfo->getTilesets().pushBack(tileset);
            tileset->release();
        }
    }
    else if (elementName == "tile")
    {
        if (tmxMapInfo->getParentElement() == TMXPropertyLayer)
        {
            TMXLayerInfo* layer = tmxMapInfo->getLayers().back();
            Size layerSize = layer->_layerSize;
            int gid = attributeDict["gid"].asInt();
            int tilesAmount = layerSize.width*layerSize.height;
            
            do
            {
                if (tilesAmount > 1)
                {
                    // Check the value is all set or not
                    CC_BREAK_IF(layer->_tiles[tilesAmount - 2] != -1 && layer->_tiles[tilesAmount - 1] != -1);
                    
                    int currentTileIndex = tilesAmount - layer->_tiles[tilesAmount - 1] - 2;
                    layer->_tiles[currentTileIndex] = gid;
                    
                    if (currentTileIndex != tilesAmount - 1)
                    {
                        --layer->_tiles[tilesAmount - 1];
                    }
                }
                else if(tilesAmount == 1)
                {
                    if (layer->_tiles[0] == -1)
                    {
                        layer->_tiles[0] = gid;
                    }
                }
            } while (0);
        }
        else
        {
            TMXTilesetInfo* info = tmxMapInfo->getTilesets().back();
            tmxMapInfo->setParentGID(info->_firstGid + attributeDict["id"].asInt());
            tmxMapInfo->getTileProperties()[tmxMapInfo->getParentGID()] = Value(ValueMap());
            tmxMapInfo->setParentElement(TMXPropertyTile);
        }
    }
    else if (elementName == "layer")
    {
        TMXLayerInfo *layer = new TMXLayerInfo();
        layer->_name = attributeDict["name"].asString();

        Size s;
        s.width = attributeDict["width"].asFloat();
        s.height = attributeDict["height"].asFloat();
        layer->_layerSize = s;

        layer->_visible = attributeDict["visible"].asBool();

        Value& opacityValue = attributeDict["opacity"];

        if( !opacityValue.isNull() )
        {
            layer->_opacity = (unsigned char)(255.0f * opacityValue.asFloat());
        }
        else
        {
            layer->_opacity = 255;
        }

        float x = attributeDict["x"].asFloat();
        float y = attributeDict["y"].asFloat();
        layer->_offset = Point(x,y);

        tmxMapInfo->getLayers().pushBack(layer);
        layer->release();

        // The parent element is now "layer"
        tmxMapInfo->setParentElement(TMXPropertyLayer);

    } 
    else if (elementName == "objectgroup")
    {
        TMXObjectGroup *objectGroup = new TMXObjectGroup();
        objectGroup->setGroupName(attributeDict["name"].asString());
        Point positionOffset;
        positionOffset.x = attributeDict["x"].asFloat() * tmxMapInfo->getTileSize().width;
        positionOffset.y = attributeDict["y"].asFloat() * tmxMapInfo->getTileSize().height;
        objectGroup->setPositionOffset(positionOffset);

        tmxMapInfo->getObjectGroups().pushBack(objectGroup);
        objectGroup->release();

        // The parent element is now "objectgroup"
        tmxMapInfo->setParentElement(TMXPropertyObjectGroup);

    }
    else if (elementName == "image")
    {
        TMXTilesetInfo* tileset = tmxMapInfo->getTilesets().back();

        // build full path
        std::string imagename = attributeDict["source"].asString();

        if (_TMXFileName.find_last_of("/") != string::npos)
        {
            string dir = _TMXFileName.substr(0, _TMXFileName.find_last_of("/") + 1);
            tileset->_sourceImage = dir + imagename;
        }
        else 
        {
            tileset->_sourceImage = _resources + (_resources.size() ? "/" : "") + imagename;
        }
    } 
    else if (elementName == "data")
    {
        std::string encoding = attributeDict["encoding"].asString();
        std::string compression = attributeDict["compression"].asString();

        if (encoding == "")
        {
            tmxMapInfo->setLayerAttribs(tmxMapInfo->getLayerAttribs() | TMXLayerAttribNone);
            
            TMXLayerInfo* layer = tmxMapInfo->getLayers().back();
            Size layerSize = layer->_layerSize;
            int tilesAmount = layerSize.width*layerSize.height;

            int *tiles = (int *) malloc(tilesAmount*sizeof(int));
            // set all value to -1
            memset(tiles, 0xFF, tilesAmount*sizeof(int));
            
            /* Save the special index in tiles[tilesAmount - 1];
             * When we load tiles, we can do this:
             * tiles[tilesAmount - tiles[tilesAmount - 1] - 1] = tileNum;
             * --tiles[tilesAmount - 1];
             * We do this because we can easily contorl how much tiles we loaded without add a "curTilesAmount" into class member.
             */
            if (tilesAmount > 1)
            {
                tiles[tilesAmount - 1] = tilesAmount - 2;
            }

            layer->_tiles = tiles;
        }
        else if (encoding == "base64")
        {
            int layerAttribs = tmxMapInfo->getLayerAttribs();
            tmxMapInfo->setLayerAttribs(layerAttribs | TMXLayerAttribBase64);
            tmxMapInfo->setStoringCharacters(true);

            if( compression == "gzip" )
            {
                layerAttribs = tmxMapInfo->getLayerAttribs();
                tmxMapInfo->setLayerAttribs(layerAttribs | TMXLayerAttribGzip);
            } else
            if (compression == "zlib")
            {
                layerAttribs = tmxMapInfo->getLayerAttribs();
                tmxMapInfo->setLayerAttribs(layerAttribs | TMXLayerAttribZlib);
            }
            CCASSERT( compression == "" || compression == "gzip" || compression == "zlib", "TMX: unsupported compression method" );
        }

    } 
    else if (elementName == "object")
    {
        TMXObjectGroup* objectGroup = tmxMapInfo->getObjectGroups().back();

        // The value for "type" was blank or not a valid class name
        // Create an instance of TMXObjectInfo to store the object and its properties
        ValueMap dict;
        // Parse everything automatically
        const char* array[] = {"name", "type", "width", "height", "gid"};
        
        for(size_t i = 0; i < sizeof(array)/sizeof(array[0]); ++i )
        {
            const char* key = array[i];
            Value value = attributeDict[key];
            dict[key] = value;
        }

        // But X and Y since they need special treatment
        // X

        int x = attributeDict["x"].asInt() + (int)objectGroup->getPositionOffset().x;
        dict["x"] = Value(x);

        // Y
        int y = attributeDict["y"].asInt() + (int)objectGroup->getPositionOffset().y;

        // Correct y position. (Tiled uses Flipped, cocos2d uses Standard)
        y = (int)(_mapSize.height * _tileSize.height) - y - attributeDict["height"].asInt();
        dict["y"] = Value(y);

        // Add the object to the objectGroup
        objectGroup->getObjects().push_back(Value(dict));

         // The parent element is now "object"
         tmxMapInfo->setParentElement(TMXPropertyObject);

    } 
    else if (elementName == "property")
    {
        if ( tmxMapInfo->getParentElement() == TMXPropertyNone ) 
        {
            CCLOG( "TMX tile map: Parent element is unsupported. Cannot add property named '%s' with value '%s'",
                  attributeDict["name"].asString().c_str(), attributeDict["value"].asString().c_str() );
        } 
        else if ( tmxMapInfo->getParentElement() == TMXPropertyMap )
        {
            // The parent element is the map
            Value value = attributeDict["value"];
            std::string key = attributeDict["name"].asString();
            tmxMapInfo->getProperties().insert(std::make_pair(key, value));
        }
        else if ( tmxMapInfo->getParentElement() == TMXPropertyLayer )
        {
            // The parent element is the last layer
            TMXLayerInfo* layer = tmxMapInfo->getLayers().back();
            Value value = attributeDict["value"];
            std::string key = attributeDict["name"].asString();
            // Add the property to the layer
            layer->getProperties().insert(std::make_pair(key, value));
        }
        else if ( tmxMapInfo->getParentElement() == TMXPropertyObjectGroup ) 
        {
            // The parent element is the last object group
            TMXObjectGroup* objectGroup = tmxMapInfo->getObjectGroups().back();
            Value value = attributeDict["value"];
            std::string key = attributeDict["name"].asString();
            objectGroup->getProperties().insert(std::make_pair(key, value));
        }
        else if ( tmxMapInfo->getParentElement() == TMXPropertyObject )
        {
            // The parent element is the last object
            TMXObjectGroup* objectGroup = tmxMapInfo->getObjectGroups().back();
            ValueMap& dict = objectGroup->getObjects().rbegin()->asValueMap();

            std::string propertyName = attributeDict["name"].asString();
            dict[propertyName] = attributeDict["value"];
        }
        else if ( tmxMapInfo->getParentElement() == TMXPropertyTile ) 
        {
            ValueMap& dict = tmxMapInfo->getTileProperties().at(tmxMapInfo->getParentGID()).asValueMap();

            std::string propertyName = attributeDict["name"].asString();
            dict[propertyName] = attributeDict["value"];
        }
    }
    else if (elementName == "polygon") 
    {
        // find parent object's dict and add polygon-points to it
        TMXObjectGroup* objectGroup = _objectGroups.back();
        ValueMap& dict = objectGroup->getObjects().rbegin()->asValueMap();

        // get points value string
        std::string value = attributeDict["points"].asString();
        if (!value.empty())
        {
            ValueVector pointsArray;
            pointsArray.reserve(10);

            // parse points string into a space-separated set of points
            stringstream pointsStream(value);
            string pointPair;
            while(std::getline(pointsStream, pointPair, ' '))
            {
                // parse each point combo into a comma-separated x,y point
                stringstream pointStream(pointPair);
                string xStr,yStr;
                
                ValueMap pointDict;

                // set x
                if(std::getline(pointStream, xStr, ','))
                {
                    int x = atoi(xStr.c_str()) + (int)objectGroup->getPositionOffset().x;
                    pointDict["x"] = Value(x);
                }

                // set y
                if(std::getline(pointStream, yStr, ','))
                {
                    int y = atoi(yStr.c_str()) + (int)objectGroup->getPositionOffset().y;
                    pointDict["y"] = Value(y);
                }
                
                // add to points array
                pointsArray.push_back(Value(pointDict));
            }
            
            dict["points"] = Value(pointsArray);
        }
    } 
    else if (elementName == "polyline")
    {
        // find parent object's dict and add polyline-points to it
        TMXObjectGroup* objectGroup = _objectGroups.back();
        ValueMap& dict = objectGroup->getObjects().rbegin()->asValueMap();
        
        // get points value string
        std::string value = attributeDict["points"].asString();
        if (!value.empty())
        {
            ValueVector pointsArray;
            pointsArray.reserve(10);
            
            // parse points string into a space-separated set of points
            stringstream pointsStream(value);
            string pointPair;
            while(std::getline(pointsStream, pointPair, ' '))
            {
                // parse each point combo into a comma-separated x,y point
                stringstream pointStream(pointPair);
                string xStr,yStr;
                
                ValueMap pointDict;
                
                // set x
                if(std::getline(pointStream, xStr, ','))
                {
                    int x = atoi(xStr.c_str()) + (int)objectGroup->getPositionOffset().x;
                    pointDict["x"] = Value(x);
                }
                
                // set y
                if(std::getline(pointStream, yStr, ','))
                {
                    int y = atoi(yStr.c_str()) + (int)objectGroup->getPositionOffset().y;
                    pointDict["y"] = Value(y);
                }
                
                // add to points array
                pointsArray.push_back(Value(pointDict));
            }
            
            dict["polylinePoints"] = Value(pointsArray);
        }
    }
}

void TMXMapInfo::endElement(void *ctx, const char *name)
{
    CC_UNUSED_PARAM(ctx);
    TMXMapInfo *tmxMapInfo = this;
    std::string elementName = (char*)name;

    int len = 0;

    if(elementName == "data")
    {
        if (tmxMapInfo->getLayerAttribs() & TMXLayerAttribBase64)
        {
            tmxMapInfo->setStoringCharacters(false);
            
            TMXLayerInfo* layer = tmxMapInfo->getLayers().back();
            
            std::string currentString = tmxMapInfo->getCurrentString();
            unsigned char *buffer;
            len = base64Decode((unsigned char*)currentString.c_str(), (unsigned int)currentString.length(), &buffer);
            if( ! buffer )
            {
                CCLOG("cocos2d: TiledMap: decode data error");
                return;
            }
            
            if( tmxMapInfo->getLayerAttribs() & (TMXLayerAttribGzip | TMXLayerAttribZlib) )
            {
                unsigned char *deflated = nullptr;
                Size s = layer->_layerSize;
                // int sizeHint = s.width * s.height * sizeof(uint32_t);
                ssize_t sizeHint = s.width * s.height * sizeof(unsigned int);
                
                ssize_t CC_UNUSED inflatedLen = ZipUtils::inflateMemoryWithHint(buffer, len, &deflated, sizeHint);
                CCASSERT(inflatedLen == sizeHint, "");
                
                free(buffer);
                buffer = nullptr;
                
                if( ! deflated )
                {
                    CCLOG("cocos2d: TiledMap: inflate data error");
                    return;
                }
                
                layer->_tiles = reinterpret_cast<int*>(deflated);
            }
            else
            {
                layer->_tiles = reinterpret_cast<int*>(buffer);
            }
            
            tmxMapInfo->setCurrentString("");
        }
        else if (tmxMapInfo->getLayerAttribs() & TMXLayerAttribNone)
        {
            TMXLayerInfo* layer = tmxMapInfo->getLayers().back();
            Size layerSize = layer->_layerSize;
            int tilesAmount = layerSize.width * layerSize.height;
            
            //set all the tiles unseted to 0
            if (tilesAmount > 1 && layer->_tiles[tilesAmount - 2] == -1)
            {
                for (int i = tilesAmount - layer->_tiles[tilesAmount - 1] - 2; i < tilesAmount; ++i)
                {
                    layer->_tiles[i] = 0;
                }
            }
            else if (layer->_tiles[tilesAmount - 1] == -1)
            {
                layer->_tiles[tilesAmount - 1] = 0;
            }
                
        }

    }
    else if (elementName == "map")
    {
        // The map element has ended
        tmxMapInfo->setParentElement(TMXPropertyNone);
    }    
    else if (elementName == "layer")
    {
        // The layer element has ended
        tmxMapInfo->setParentElement(TMXPropertyNone);
    }
    else if (elementName == "objectgroup")
    {
        // The objectgroup element has ended
        tmxMapInfo->setParentElement(TMXPropertyNone);
    } 
    else if (elementName == "object") 
    {
        // The object element has ended
        tmxMapInfo->setParentElement(TMXPropertyNone);
    }
    else if (elementName == "tileset")
    {
        _recordFirstGID = true;
    }
}

void TMXMapInfo::textHandler(void *ctx, const char *ch, int len)
{
    CC_UNUSED_PARAM(ctx);
    TMXMapInfo *tmxMapInfo = this;
    std::string text((char*)ch,0,len);

    if (tmxMapInfo->isStoringCharacters())
    {
        std::string currentString = tmxMapInfo->getCurrentString();
        currentString += text;
        tmxMapInfo->setCurrentString(currentString.c_str());
    }
}

NS_CC_END