//
//  SuperTuxKart - a fun racing game with go-kart
//  Copyright (C) 2009-2015 Joerg Henrichs
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 3
//  of the License, or (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

#include "io/file_manager.hpp"
#include "io/xml_node.hpp"
#include "utils/interpolation_array.hpp"
#include "utils/vec3.hpp"

#include <stdexcept>

XMLNode::XMLNode(io::IXMLReader *xml)
{
    m_file_name = "[unknown]";

    while(xml->getNodeType()!=io::EXN_ELEMENT && xml->read());
    readXML(xml);
}   // XMLNode

// ----------------------------------------------------------------------------
/** Reads a XML file and convert it into a XMLNode tree.
 *  \param filename Name of the XML file to read.
 */
XMLNode::XMLNode(const std::string &filename)
{
    m_file_name = filename;

    io::IXMLReader *xml = file_manager->createXMLReader(filename);
    
    if (xml == NULL)
    {
        throw std::runtime_error("Cannot find file "+filename);
    }

    bool is_first_element = true;
    while(xml->read())
    {
        switch (xml->getNodeType())
        {
        case io::EXN_ELEMENT:
            {
                if(!is_first_element)
                {
                    Log::warn("[XMLNode]",
                                "More than one root element in '%s' - ignored.",
                            filename.c_str());
                }
                readXML(xml);
                is_first_element = false;
                break;
            }
        case io::EXN_ELEMENT_END:  break;   // Ignore all other types
        case io::EXN_UNKNOWN:      break;
        case io::EXN_COMMENT:      break;
        case io::EXN_TEXT:         break;
        default:                   break;
        }   // switch
    }   // while
    xml->drop();
}   // XMLNode

// ----------------------------------------------------------------------------
/** Destructor. */
XMLNode::~XMLNode()
{
    for(unsigned int i=0; i<m_nodes.size(); i++)
    {
        delete m_nodes[i];
    }
    m_nodes.clear();
}   // ~XMLNode

// ----------------------------------------------------------------------------
/** Stores all attributes, and reads in all children.
 *  \param xml The XML reader.
 */
void XMLNode::readXML(io::IXMLReader *xml)
{
    m_name = std::string(core::stringc(xml->getNodeName()).c_str());

    for(unsigned int i=0; i<xml->getAttributeCount(); i++)
    {
        std::string   name  = core::stringc(xml->getAttributeName(i)).c_str();
        core::stringw value = xml->getAttributeValue(i);
        m_attributes[name] = value;
    }   // for i

    // If no children, we are done
    if(xml->isEmptyElement())
        return;

    /** Read all children elements. */
    while(xml->read())
    {
        switch (xml->getNodeType())
        {
        case io::EXN_ELEMENT:
            {
                XMLNode* n = new XMLNode(xml);
                n->m_file_name = m_file_name;
                m_nodes.push_back(n);
                break;
            }
        case io::EXN_ELEMENT_END:
            // End of this element found.
            return;
            break;
        case io::EXN_UNKNOWN:            break;
        case io::EXN_COMMENT:            break;
        case io::EXN_TEXT:               break;
        default:                         break;
        }   // switch
    }   // while
}   // readXML

// ----------------------------------------------------------------------------
/** Returns the i.th node.
 *  \param i Number of node to return.
 */
const XMLNode *XMLNode::getNode(unsigned int i) const
{
    return m_nodes[i];
}   // getNode

// ----------------------------------------------------------------------------
/** Returns the node with the given name.
 *  \param s Name of the node to return.
 */
const XMLNode *XMLNode::getNode(const std::string &s) const
{
    for(unsigned int i=0; i<m_nodes.size(); i++)
    {
        if(m_nodes[i]->getName()==s) return m_nodes[i];
    }
    return NULL;
}   // getNode

// ----------------------------------------------------------------------------
/** Returns all nodes with the given name.
 *  \param s Name of the nodes to return.
 *  \param s Vector that will be filled with output values.
 */
const void XMLNode::getNodes(const std::string &s, std::vector<XMLNode*>& out) const
{
    for(unsigned int i=0; i<m_nodes.size(); i++)
    {
        if(m_nodes[i]->getName()==s)
        {
            out.push_back(m_nodes[i]);
        }
    }
}   // getNode

// ----------------------------------------------------------------------------
/** If 'attribute' was defined, set 'value' to the value of the
*   attribute and return 1, otherwise return 0 and do not change value.
*  \param attribute Name of the attribute.
*  \param value Value of the attribute.
*/
int XMLNode::get(const std::string &attribute, std::string *value) const
{
    if(m_attributes.empty()) return 0;
    std::map<std::string, core::stringw>::const_iterator o;
    o = m_attributes.find(attribute);
    if(o==m_attributes.end()) return 0;
    *value=core::stringc(o->second).c_str();
    return 1;
}   // get
// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, core::stringw *value) const
{
    if(m_attributes.empty()) return 0;
    std::map<std::string, core::stringw>::const_iterator o;
    o = m_attributes.find(attribute);
    if(o==m_attributes.end()) return 0;
    *value = o->second;
    return 1;
}   // get
// ----------------------------------------------------------------------------
int XMLNode::getAndDecode(const std::string &attribute, core::stringw *value) const
{
    if (m_attributes.empty()) return 0;
    std::map<std::string, core::stringw>::const_iterator o;
    o = m_attributes.find(attribute);
    if (o == m_attributes.end()) return 0;
    std::string raw_value = core::stringc(o->second).c_str();
    *value = StringUtils::xmlDecode(raw_value);
    return 1;
}   // get
// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, core::vector2df *value) const
{
    std::string s = "";
    if(!get(attribute, &s)) return 0;

    std::vector<std::string> v = StringUtils::split(s,' ');
    if(v.size()!=2) return 0;
    value->X = (float)atof(v[0].c_str());
    value->Y = (float)atof(v[1].c_str());
    return 1;
}   // get(vector2df)

// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, core::vector3df *value) const
{
    Vec3 xyz;
    if(!get(attribute, &xyz)) return 0;

    *value = xyz.toIrrVector();
    return 1;
}   // get(vector3df)

// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, Vec3 *value) const
{
    std::string s = "";
    if(!get(attribute, &s)) return 0;

    std::vector<std::string> v = StringUtils::split(s,' ');
    if (v.size() != 3)
    {
        Log::warn("[XMLNode]", "WARNING: Expected 3 floating-point values, but found '%s' in file %s",
                    s.c_str(), m_file_name.c_str());
        return 0;
    }

    float x, y, z;

    if (StringUtils::parseString<float>(v[0], &x) &&
        StringUtils::parseString<float>(v[1], &y) &&
        StringUtils::parseString<float>(v[2], &z) )
    {
        value->setX(x);
        value->setY(y);
        value->setZ(z);
    }
    else
    {
        Log::warn("[XMLNode]", "WARNING: Expected 3 floating-point values, but found '%s' in file %s",
                    s.c_str(), m_file_name.c_str());
        return 0;
    }

    return 1;
}   // get(Vec3)

// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, video::SColor *color) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    std::vector<std::string> v = StringUtils::split(s,' ');
    if (v.size()<3 || v.size()>4) return 0;
    if (v.size()==3)
    {
        color->setRed  (atoi(v[0].c_str()));
        color->setGreen(atoi(v[1].c_str()));
        color->setBlue (atoi(v[2].c_str()));
    }
    else
    {
        color->set(atoi(v[3].c_str()), // irrLicht expects ARGB, and we use RGBA in XML files
                   atoi(v[0].c_str()),
                   atoi(v[1].c_str()),
                   atoi(v[2].c_str()));
    }
    return 1;
}   // get(SColor)

// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, video::SColorf *color) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    std::vector<std::string> v = StringUtils::split(s,' ');
    if(v.size()==3)
    {
        color->set((float)atof(v[0].c_str())/255.0f,
                   (float)atof(v[1].c_str())/255.0f,
                   (float)atof(v[2].c_str())/255.0f);
    }
    else if(v.size()==4)
    {
        color->set((float)atof(v[3].c_str())/255.0f,  // set takes ARGB, but we use RGBA
                   (float)atof(v[0].c_str())/255.0f,
                   (float)atof(v[1].c_str())/255.0f,
                   (float)atof(v[2].c_str())/255.0f);
    }
    else
        return 0;

    return 1;
}   // get(SColor)
// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, int32_t *value) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    if (!StringUtils::parseString<int>(s, value))
    {
        Log::warn("[XMLNode]", "WARNING: Expected int but found '%s' for attribute '%s' of node '%s' in file %s",
                    s.c_str(), attribute.c_str(), m_name.c_str(), m_file_name.c_str());
        return 0;
    }

    return 1;
}   // get(int32_t)

// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, int64_t *value) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    if (!StringUtils::parseString<int64_t>(s, value))
    {
        Log::warn("[XMLNode]", "WARNING: Expected int but found '%s' for attribute '%s' of node '%s' in file %s",
                    s.c_str(), attribute.c_str(), m_name.c_str(), m_file_name.c_str());
        return 0;
    }

    return 1;
}   // get(int64_t)


// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, uint16_t *value) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    if (!StringUtils::parseString<uint16_t>(s, value))
    {
        Log::warn("[XMLNode]", "WARNING: Expected uint but found '%s' for attribute '%s' of node '%s' in file %s",
                    s.c_str(), attribute.c_str(), m_name.c_str(), m_file_name.c_str());
        return 0;
    }

    return 1;
}   // get(uint32_t)

// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, uint32_t *value) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    if (!StringUtils::parseString<unsigned int>(s, value))
    {
        Log::warn("[XMLNode]", "WARNING: Expected uint but found '%s' for attribute '%s' of node '%s' in file %s",
                    s.c_str(), attribute.c_str(), m_name.c_str(), m_file_name.c_str());
        return 0;
    }

    return 1;
}   // get(uint32_t)

// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, float *value) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    if (!StringUtils::parseString<float>(s, value))
    {
        Log::warn("[XMLNode]", "WARNING: Expected float but found '%s' for attribute '%s' of node '%s' in file %s",
                    s.c_str(), attribute.c_str(), m_name.c_str(), m_file_name.c_str());
        return 0;
    }

    return 1;
}   // get(int)

// ----------------------------------------------------------------------------
int XMLNode::get(const std::string &attribute, bool *value) const
{
    std::string s;

    // FIXME: for some reason, missing attributes don't trigger that if???
    if(!get(attribute, &s)) return 0;
    *value = s[0]=='T' || s[0]=='t' || s[0]=='Y' || s[0]=='y' ||
             s=="#t"   || s   =="#T" || s=="1";
    return 1;
}   // get(bool)

// ----------------------------------------------------------------------------
/** If 'attribute' was defined, split the value of the attribute by spaces,
 *  set value to this vector array and return the number of elements. Otherwise
 *  return 0 and do not change value.
 *  \param attribute Name of the attribute.
 *  \param value Value of the attribute.
 */
int XMLNode::get(const std::string &attribute,
                 std::vector<std::string> *value) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    *value = StringUtils::split(s,' ');
    return (int) value->size();
}   // get(vector<string>)

// ----------------------------------------------------------------------------
/** If 'attribute' was defined, split the value of the attribute by spaces,
 *  set value to this vector array and return the number of elements. Otherwise
 *  return 0 and do not change value.
 *  \param attribute Name of the attribute.
 *  \param value Value of the attribute.
 */
int XMLNode::get(const std::string &attribute,
                 std::vector<float> *value) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    std::vector<std::string> v = StringUtils::split(s,' ');
    value->clear();

    const unsigned int count = (unsigned int)v.size();
    for (unsigned int i=0; i<count; i++)
    {
        float curr;
        if (!StringUtils::parseString<float>(v[i], &curr))
        {
            Log::warn("[XMLNode]", "WARNING: Expected float but found '%s' for attribute '%s' of node '%s' in file %s",
                        v[i].c_str(), attribute.c_str(), m_name.c_str(), m_file_name.c_str());
            return 0;
        }

        value->push_back(curr);
    }
    return (int) value->size();
}   // get(vector<float>)

// ----------------------------------------------------------------------------
/** If 'attribute' was defined, split the value of the attribute by spaces,
 *  set value to this vector array and return the number of elements. Otherwise
 *  return 0 and do not change value.
 *  \param attribute Name of the attribute.
 *  \param value Value of the attribute.
 */
int XMLNode::get(const std::string &attribute, std::vector<int> *value) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    std::vector<std::string> v = StringUtils::split(s,' ');
    value->clear();

    const unsigned int count = (unsigned int)v.size();
    for (unsigned int i=0; i<count; i++)
    {
        int val;
        if (!StringUtils::parseString<int>(v[i], &val))
        {
            Log::warn("[XMLNode]", "WARNING: Expected int but found '%s' for attribute '%s' of node '%s'",
                        v[i].c_str(), attribute.c_str(), m_name.c_str());
            return 0;
        }

        value->push_back(val);
    }
    return (int) value->size();
}   // get(vector<int>)

// ----------------------------------------------------------------------------
/** Reads an InterpolatioARray. The values must be specified as:
 *  x0:y0 x1:y1 x2:y2 ...
 *  and the X values must be sorted. The function will abort (exit) with
 *  an error message in case of incorrectly formed x:y pairs.
 *  \param attribute Name of the attribute.
 *  \param value The InterpolationArray.
 *  \returns 0 in case of an error, !=0 otherwise
 */
int XMLNode::get(const std::string &attribute, InterpolationArray *value) const
{
    std::string s;
    if(!get(attribute, &s)) return 0;

    std::vector<std::string> pairs = StringUtils::split(s, ' ');
    for(unsigned int i=0; i<pairs.size(); i++)
    {
        std::vector<std::string> pair = StringUtils::split(pairs[i],':');
        if(pair.size()!=2)
        {
            Log::fatal("[XMLNode]", "Incorrect interpolation pair '%s' in '%s'.",
                        pairs[i].c_str(), attribute.c_str());
            Log::fatal("[XMLNode]", "Must be x:y.");
            exit(-1);
        }
        float x;
        if(!StringUtils::fromString(pair[0], x))
        {
            Log::fatal("[XMLNode]", "Incorrect x in pair '%s' of '%s'.",
                   pairs[i].c_str(), attribute.c_str());
            exit(-1);
        }
        float y;
        if(!StringUtils::fromString(pair[1], y))
        {
            Log::fatal("[XMLNode]", "Incorrect y in pair '%s' in '%s'.",
                  pair[1].c_str(), attribute.c_str());
            exit(-1);
        }
        if(!value->push_back(x, y))
        {
            return 0;
        }
    }   // for i
    return 1;
}   // get(InterpolationArray)

// ----------------------------------------------------------------------------
/** Interprets the attributes 'x', 'y', 'z'  or 'h', 'p', 'r' as a 3d vector
 *  and set the corresponding elements of value. Not all values need to be
 *  defined as attributes (and the correspnding elements of the vector will
 *  not be changed). It returns a bit field for each defined value, i.e. if x
 *  and y are defined, 3 is returned.
 *  \param value Vector to return the values in.
 */
int XMLNode::get(core::vector3df *value) const
{
    float f;
    int bits=0;
    if(get("x", &f)) { value->X = f; bits |= 1; }
    if(get("h", &f)) { value->X = f; bits |= 1; }
    if(get("y", &f)) { value->Y = f; bits |= 2; }
    if(get("p", &f)) { value->Y = f; bits |= 2; }
    if(get("z", &f)) { value->Z = f; bits |= 4; }
    if(get("r", &f)) { value->Z = f; bits |= 4; }
    return bits;
}   // core::vector3df

// ----------------------------------------------------------------------------
/** Interprets the attributes 'x', 'y', 'z' as a 3d vector and set the
 *  corresponding elements of value. Not all values need to be defined as
 *  attributes (and the correspnding elements of the vector will not be
 *  changed). It returns a bit field for each defined value, i.e. if x
 *  and y are defined, 3 is returned.
 *  \param value Vector to return the values in.
 */
int XMLNode::getXYZ(core::vector3df *value) const
{
    float f;
    int bits=0;
    if(get("x", &f)) { value->X = f; bits |= 1; }
    if(get("y", &f)) { value->Y = f; bits |= 2; }
    if(get("z", &f)) { value->Z = f; bits |= 4; }
    return bits;
}   // getXYZ vector3df

// ----------------------------------------------------------------------------
/** Interprets the attributes 'x', 'y', 'z' as a 3d vector and set the
 *  corresponding elements of value. Not all values need to be defined as
 *  attributes (and the correspnding elements of the vector will not be
 *  changed). It returns a bit field for each defined value, i.e. if x
 *  and y are defined, 3 is returned.
 *  \param value Vector to return the values in.
 */
int XMLNode::getXYZ(Vec3 *value) const
{
    float f;
    int bits=0;
    if(get("x", &f)) { value->setX(f); bits |= 1; }
    if(get("y", &f)) { value->setY(f); bits |= 2; }
    if(get("z", &f)) { value->setZ(f); bits |= 4; }
    return bits;
}   // getXYZ Vec3

// ----------------------------------------------------------------------------
/** Interprets the attributes 'h', 'p', 'r' as a 3d vector and set the
 *  corresponding elements of value. Not all values need to be defined as
 *  attributes (and the correspnding elements of the vector will not be
 *  changed). It returns a bit field for each defined value, i.e. if x and y
 *  are defined, 3 is returned.
 *  \param value Vector to return the values in.
 */
int XMLNode::getHPR(core::vector3df *value) const
{
    float f;
    int bits=0;
    if(get("h", &f)) { value->X = f; bits |= 1; }
    if(get("p", &f)) { value->Y = f; bits |= 2; }
    if(get("r", &f)) { value->Z = f; bits |= 4; }
    return bits;
}   // getHPR vector3df

// ----------------------------------------------------------------------------
/** Interprets the attributes 'h', 'p', 'r' as a 3d vector and set the
 *  corresponding elements of value. Not all values need to be defined as
 *  attributes (and the correspnding elements of the vector will not be
 *  changed). It returns a bit field for each defined value, i.e. if x and y
 *  are defined, 3 is returned.
 *  \param value Vector to return the values in.
 */
int XMLNode::getHPR(Vec3 *value) const
{
    float f;
    int bits=0;
    if(get("h", &f)) { value->setX(f); bits |= 1; }
    if(get("p", &f)) { value->setY(f); bits |= 2; }
    if(get("r", &f)) { value->setZ(f); bits |= 4; }
    return bits;
}   // getHPR Vec3

// ----------------------------------------------------------------------------

bool XMLNode::hasChildNamed(const char* name) const
{
    for (unsigned int i = 0; i < m_nodes.size(); i++)
    {
        if (m_nodes[i]->getName() == name) return true;
    }
    return false;
}