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/*===========================================================================*\
 *                                                                           *
 *                               OpenMesh                                    *
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 *      Copyright (C) 2001-2009 by Computer Graphics Group, RWTH Aachen      *
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 *                           www.openmesh.org                                *
 *                                                                           *
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 *---------------------------------------------------------------------------*
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 *  This file is part of OpenMesh.                                           *
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 *                                                                           *
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 *  OpenMesh is free software: you can redistribute it and/or modify         *
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 *  it under the terms of the GNU Lesser General Public License as           *
 *  published by the Free Software Foundation, either version 3 of           *
 *  the License, or (at your option) any later version with the              *
 *  following exceptions:                                                    *
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 *                                                                           *
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 *  If other files instantiate templates or use macros                       *
 *  or inline functions from this file, or you compile this file and         *
 *  link it with other files to produce an executable, this file does        *
 *  not by itself cause the resulting executable to be covered by the        *
 *  GNU Lesser General Public License. This exception does not however       *
 *  invalidate any other reasons why the executable file might be            *
 *  covered by the GNU Lesser General Public License.                        *
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 *                                                                           *
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 *  OpenMesh 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 Lesser General Public License for more details.                      *
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 *                                                                           *
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 *  You should have received a copy of the GNU LesserGeneral Public          *
 *  License along with OpenMesh.  If not,                                    *
 *  see <http://www.gnu.org/licenses/>.                                      *
 *                                                                           *
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 \*===========================================================================*/
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/*===========================================================================*\
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 *                                                                           *
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 *   $Revision$                                                         *
 *   $Date$                   *
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 *                                                                           *
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 \*===========================================================================*/
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#define LINE_LEN 4096

//== INCLUDES =================================================================

// OpenMesh
#include <OpenMesh/Core/System/config.h>
#include <OpenMesh/Core/System/omstream.hh>
#include <OpenMesh/Core/IO/reader/PLYReader.hh>
#include <OpenMesh/Core/IO/importer/BaseImporter.hh>
#include <OpenMesh/Core/IO/IOManager.hh>
#include <OpenMesh/Core/Utils/color_cast.hh>
#include <OpenMesh/Core/IO/SR_store.hh>

//STL
#include <fstream>
#include <memory>

#ifndef WIN32
#include <string.h>
#endif

//=== NAMESPACES ==============================================================


namespace OpenMesh {
namespace IO {

//=============================================================================

//=== INSTANCIATE =============================================================


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_PLYReader_ __PLYReaderInstance;
_PLYReader_& PLYReader() {
	return __PLYReaderInstance;
}
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//=== IMPLEMENTATION ==========================================================


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_PLYReader_::_PLYReader_() {
	IOManager().register_module(this);
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}

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


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bool _PLYReader_::read(const std::string& _filename, BaseImporter& _bi, Options& _opt) {
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	std::fstream in(_filename.c_str(), (options_.is_binary() ? std::ios_base::binary | std::ios_base::in
			: std::ios_base::in));
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	if (!in.is_open() || !in.good()) {
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		omerr() << "[PLYReader] : cannot not open file " << _filename << std::endl;
		return false;
	}
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	bool result = read(in, _bi, _opt);
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	in.close();
	return result;
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}

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


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bool _PLYReader_::read(std::istream& _in, BaseImporter& _bi, Options& _opt) {

    if (!_in.good()) {
        omerr() << "[PLYReader] : cannot not use stream" << std::endl;
        return false;
    }

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	// filter relevant options for reading
	bool swap = _opt.check(Options::Swap);
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	userOptions_ = _opt;
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	// build options to be returned
	_opt.clear();
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	if (options_.vertex_has_normal() && userOptions_.vertex_has_normal()) {
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		_opt += Options::VertexNormal;
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	}
	if (options_.vertex_has_texcoord() && userOptions_.vertex_has_texcoord()) {
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		_opt += Options::VertexTexCoord;
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	}
	if (options_.vertex_has_color() && userOptions_.vertex_has_color()) {
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		_opt += Options::VertexColor;
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	}
	if (options_.face_has_color() && userOptions_.face_has_color()) {
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		_opt += Options::FaceColor;
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	}
	if (options_.is_binary()) {
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		_opt += Options::Binary;
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	}
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	//    //force user-choice for the alpha value when reading binary
	//    if ( options_.is_binary() && userOptions_.color_has_alpha() )
	//      options_ += Options::ColorAlpha;
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	return (options_.is_binary() ? read_binary(_in, _bi, swap) : read_ascii(_in, _bi));
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}

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

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bool _PLYReader_::read_ascii(std::istream& _in, BaseImporter& _bi) const {
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	omlog() << "[PLYReader] : read ascii file\n";

	// Reparse the header
	if (!can_u_read(_in)) {
		omerr() << "[PLYReader] : Unable to parse header\n";
		return false;
	}

	unsigned int i, j, k, l, idx;
	unsigned int nV;
	OpenMesh::Vec3f v;
	std::string trash;
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	OpenMesh::Vec2f t;
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	OpenMesh::Vec4i c;
	float tmp;
	BaseImporter::VHandles vhandles;
	VertexHandle vh;

	_bi.reserve(vertexCount_, 3* vertexCount_ , faceCount_);

	if (vertexDimension_ != 3) {
		omerr() << "[PLYReader] : Only vertex dimension 3 is supported." << std::endl;
		return false;
	}

	// read vertices:
	for (i = 0; i < vertexCount_ && !_in.eof(); ++i) {
		v[0] = 0.0;
		v[1] = 0.0;
		v[2] = 0.0;

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		t[0] = 0.0;
		t[1] = 0.0;

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		c[0] = 0;
		c[1] = 0;
		c[2] = 0;
		c[3] = 255;

		for (uint propertyIndex = 0; propertyIndex < vertexPropertyCount_; ++propertyIndex) {
			switch (vertexPropertyMap_[propertyIndex].first) {
			case XCOORD:
				_in >> v[0];
				break;
			case YCOORD:
				_in >> v[1];
				break;
			case ZCOORD:
				_in >> v[2];
				break;
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			case TEXX:
				_in >> t[0];
				break;
			case TEXY:
				_in >> t[1];
				break;
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			case COLORRED:
				if (vertexPropertyMap_[propertyIndex].second == ValueTypeFLOAT32) {
					_in >> tmp;
					c[0] = static_cast<OpenMesh::Vec4i::value_type> (tmp * 255.0f);
				} else
					_in >> c[0];
				break;
			case COLORGREEN:
				if (vertexPropertyMap_[propertyIndex].second == ValueTypeFLOAT32) {
					_in >> tmp;
					c[1] = static_cast<OpenMesh::Vec4i::value_type> (tmp * 255.0f);
				} else
					_in >> c[1];
				break;
			case COLORBLUE:
				if (vertexPropertyMap_[propertyIndex].second == ValueTypeFLOAT32) {
					_in >> tmp;
					c[2] = static_cast<OpenMesh::Vec4i::value_type> (tmp * 255.0f);
				} else
					_in >> c[2];
				break;
			case COLORALPHA:
				if (vertexPropertyMap_[propertyIndex].second == ValueTypeFLOAT32) {
					_in >> tmp;
					c[3] = static_cast<OpenMesh::Vec4i::value_type> (tmp * 255.0f);
				} else
					_in >> c[3];
				break;
			default:
				_in >> trash;
				break;
			}
		}

		vh = _bi.add_vertex(v);
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		_bi.set_texcoord(vh, t);
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		_bi.set_color(vh, Vec4uc(c));
	}

	// faces
	// #N <v1> <v2> .. <v(n-1)> [color spec]
	for (i = 0; i < faceCount_; ++i) {
		// nV = number of Vertices for current face
		_in >> nV;

		if (nV == 3) {
			vhandles.resize(3);
			_in >> j;
			_in >> k;
			_in >> l;

			vhandles[0] = VertexHandle(j);
			vhandles[1] = VertexHandle(k);
			vhandles[2] = VertexHandle(l);
		} else {
			vhandles.clear();
			for (j = 0; j < nV; ++j) {
				_in >> idx;
				vhandles.push_back(VertexHandle(idx));
			}
		}

		FaceHandle fh = _bi.add_face(vhandles);

	}

	// File was successfully parsed.
	return true;
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}

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

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bool _PLYReader_::read_binary(std::istream& _in, BaseImporter& _bi, bool /*_swap*/) const {
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	omlog() << "[PLYReader] : read binary file format\n";

	// Reparse the header
	if (!can_u_read(_in)) {
		omerr() << "[PLYReader] : Unable to parse header\n";
		return false;
	}

	unsigned int i, j, k, l, idx;
	unsigned int nV;
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	OpenMesh::Vec3f v;  // Vertex
	OpenMesh::Vec2f t;  // TexCoords
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	BaseImporter::VHandles vhandles;
	VertexHandle vh;
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	OpenMesh::Vec4i c;  // Color
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	float tmp;

	_bi.reserve(vertexCount_, 3* vertexCount_ , faceCount_);

	// read vertices:
	for (i = 0; i < vertexCount_ && !_in.eof(); ++i) {
		v[0] = 0.0;
		v[1] = 0.0;
		v[2] = 0.0;

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		t[0] = 0.0;
		t[1] = 0.0;

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		c[0] = 0;
		c[1] = 0;
		c[2] = 0;
		c[3] = 255;

		for (uint propertyIndex = 0; propertyIndex < vertexPropertyCount_; ++propertyIndex) {
			switch (vertexPropertyMap_[propertyIndex].first) {
			case XCOORD:
				readValue(vertexPropertyMap_[propertyIndex].second, _in, v[0]);
				break;
			case YCOORD:
				readValue(vertexPropertyMap_[propertyIndex].second, _in, v[1]);
				break;
			case ZCOORD:
				readValue(vertexPropertyMap_[propertyIndex].second, _in, v[2]);
				break;
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			case TEXX:
				readValue(vertexPropertyMap_[propertyIndex].second, _in, t[0]);
				break;
			case TEXY:
				readValue(vertexPropertyMap_[propertyIndex].second, _in, t[1]);
				break;
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			case COLORRED:
				if (vertexPropertyMap_[propertyIndex].second == ValueTypeFLOAT32) {
					readValue(vertexPropertyMap_[propertyIndex].second, _in, tmp);

					c[0] = static_cast<OpenMesh::Vec4i::value_type> (tmp * 255.0f);
				} else
					readValue(vertexPropertyMap_[propertyIndex].second, _in, c[0]);
				break;
			case COLORGREEN:
				if (vertexPropertyMap_[propertyIndex].second == ValueTypeFLOAT32) {
					readValue(vertexPropertyMap_[propertyIndex].second, _in, tmp);
					c[1] = static_cast<OpenMesh::Vec4i::value_type> (tmp * 255.0f);
				} else
					readValue(vertexPropertyMap_[propertyIndex].second, _in, c[1]);
				break;
			case COLORBLUE:
				if (vertexPropertyMap_[propertyIndex].second == ValueTypeFLOAT32) {
					readValue(vertexPropertyMap_[propertyIndex].second, _in, tmp);
					c[2] = static_cast<OpenMesh::Vec4i::value_type> (tmp * 255.0f);
				} else
					readValue(vertexPropertyMap_[propertyIndex].second, _in, c[2]);
				break;
			case COLORALPHA:
				if (vertexPropertyMap_[propertyIndex].second == ValueTypeFLOAT32) {
					readValue(vertexPropertyMap_[propertyIndex].second, _in, tmp);
					c[3] = static_cast<OpenMesh::Vec4i::value_type> (tmp * 255.0f);
				} else
					readValue(vertexPropertyMap_[propertyIndex].second, _in, c[3]);
				break;
			default:
				break;
			}

		}

		vh = _bi.add_vertex(v);
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		_bi.set_texcoord(vh, t);
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		_bi.set_color(vh, Vec4uc(c));
	}

	for (i = 0; i < faceCount_; ++i) {
		// Read number of vertices for the current face
		readValue(faceIndexType_, _in, nV);

		if (nV == 3) {
			vhandles.resize(3);
			readValue(faceEntryType_, _in, j);
			readValue(faceEntryType_, _in, k);
			readValue(faceEntryType_, _in, l);

			vhandles[0] = VertexHandle(j);
			vhandles[1] = VertexHandle(k);
			vhandles[2] = VertexHandle(l);
		} else {
			vhandles.clear();
			for (j = 0; j < nV; ++j) {
				readValue(faceEntryType_, _in, idx);
				vhandles.push_back(VertexHandle(idx));
			}
		}

		FaceHandle fh = _bi.add_face(vhandles);
	}

	return true;
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}

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


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


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void _PLYReader_::readValue(ValueType _type, std::istream& _in, float& _value) const {
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	switch (_type) {
	case ValueTypeFLOAT32:
	case ValueTypeFLOAT:
		float32_t tmp;
		restore(_in, tmp, options_.check(Options::MSB));
		_value = tmp;
		break;
	default:
		_value = 0.0;
		std::cerr << "unsupported conversion type to float: " << _type << std::endl;
		break;
	}
}

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void _PLYReader_::readValue(ValueType _type, std::istream& _in, unsigned int& _value) const {
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	int32_t tmp_int32_t;
	uint8_t tmp_uchar;

	switch (_type) {
	case ValueTypeINT:
	case ValueTypeINT32:
		restore(_in, tmp_int32_t, options_.check(Options::MSB));
		_value = tmp_int32_t;
		break;
	case ValueTypeUCHAR:
		restore(_in, tmp_uchar, options_.check(Options::MSB));
		_value = tmp_uchar;
		break;
	default:
		_value = 0;
		std::cerr << "unsupported conversion type to int: " << _type << std::endl;
		break;
	}
}

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void _PLYReader_::readValue(ValueType _type, std::istream& _in, int& _value) const {
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	int32_t tmp_int32_t;
	uint8_t tmp_uchar;

	switch (_type) {
	case ValueTypeINT:
	case ValueTypeINT32:
		restore(_in, tmp_int32_t, options_.check(Options::MSB));
		_value = tmp_int32_t;
		break;
	case ValueTypeUCHAR:
		restore(_in, tmp_uchar, options_.check(Options::MSB));
		_value = tmp_uchar;
		break;
	default:
		_value = 0;
		std::cerr << "unsupported conversion type to int: " << _type << std::endl;
		break;
	}
}

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

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bool _PLYReader_::can_u_read(const std::string& _filename) const {
	// !!! Assuming BaseReader::can_u_parse( std::string& )
	// does not call BaseReader::read_magic()!!!
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	if (BaseReader::can_u_read(_filename)) {
		std::ifstream ifs(_filename.c_str());
		if (ifs.is_open() && can_u_read(ifs)) {
			ifs.close();
			return true;
		}
	}
	return false;
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}

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

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std::string get_property_name(std::string _string1, std::string _string2) {
	if (_string1 == "float32" || _string1 == "uint8" || _string1 == "uchar" || _string1 == "float" || _string1
			== "int32")
		return _string2;

	if (_string2 == "float32" || _string2 == "uint8" || _string2 == "uchar" || _string2 == "float" || _string2
			== "int32")
		return _string1;

	std::cerr << "Unsupported entry type" << std::endl;
	return "Unsupported";
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}

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

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_PLYReader_::ValueType get_property_type(std::string _string1, std::string _string2) {
	if (_string1 == "float32" || _string2 == "float32")
		return _PLYReader_::ValueTypeFLOAT32;
	else if (_string1 == "uint8" || _string2 == "float32")
		return _PLYReader_::ValueTypeUINT8;
	else if (_string1 == "int32" || _string2 == "float32")
		return _PLYReader_::ValueTypeINT32;
	else if (_string1 == "uchar" || _string2 == "uchar")
		return _PLYReader_::ValueTypeUCHAR;
	else if (_string1 == "float" || _string2 == "float")
		return _PLYReader_::ValueTypeFLOAT;

	return _PLYReader_::Unsupported;
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}

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

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bool _PLYReader_::can_u_read(std::istream& _is) const {
	// Clear per file options
	options_.cleanup();

	// clear vertex property map, will be recreated
	vertexPropertyMap_.clear();
	vertexPropertyCount_ = 0;

	// read 1st line
	std::string line;
	std::getline(_is, line);

	//Check if this file is really a ply format
	if (line != "PLY" && line != "ply")
		return false;

	//   omlog() << "PLY header found" << std::endl;

	vertexCount_ = 0;
	faceCount_ = 0;
	vertexDimension_ = 0;

	std::string keyword;
	std::string fileType;
	std::string elementName = "";
	std::string propertyType;
	std::string propertyName;
	std::string listIndexType;
	std::string listEntryType;
	float version;

	_is >> keyword;
	_is >> fileType;
	_is >> version;

	if (_is.bad()) {
		omerr() << "Defect PLY header detected" << std::endl;
		return false;
	}

	if (fileType == "ascii") {
		options_ -= Options::Binary;
	} else if (fileType == "binary_little_endian") {
		options_ += Options::Binary;
		options_ += Options::LSB;
	} else if (fileType == "binary_big_endian") {
		options_ += Options::Binary;
		options_ += Options::MSB;
	} else {
		omerr() << "Unsupported PLY format: " << fileType << std::endl;
		return false;
	}

	unsigned int streamPos = _is.tellg();
	_is >> keyword;
	while (keyword != "end_header") {

		if (keyword == "comment") {
			std::getline(_is, line);
			omlog() << "PLY header comment : " << line << std::endl;
		} else if (keyword == "element") {
			_is >> elementName;
			if (elementName == "vertex") {
				_is >> vertexCount_;
			} else if (elementName == "face") {
				_is >> faceCount_;
			} else {
				omerr() << "PLY header unsupported element type: " << elementName << std::endl;
			}
		} else if (keyword == "property") {
			std::string tmp1;
			std::string tmp2;

			// Read first keyword, as it might be a list
			_is >> tmp1;

			if (tmp1 == "list") {
				if (elementName == "vertex") {
					omerr() << "List type not supported for vertices!" << std::endl;
				} else if (elementName == "face") {
					_is >> listIndexType;
					_is >> listEntryType;
					_is >> propertyName;

					if (listIndexType == "uint8") {
						faceIndexType_ = ValueTypeUINT8;
					} else if (listIndexType == "uchar") {
						faceIndexType_ = ValueTypeUCHAR;
					} else {
						omerr() << "Unsupported Index type for face list: " << listIndexType << std::endl;
					}

					if (listEntryType == "int32") {
						faceEntryType_ = ValueTypeINT32;
					} else if (listEntryType == "int") {
						faceEntryType_ = ValueTypeINT;
					} else {
						omerr() << "Unsupported Entry type for face list: " << listEntryType << std::endl;
					}

				}
			} else {
				// as this is not a list property, read second value of property
				_is >> tmp2;

				if (elementName == "vertex") {
					// Extract name and type of property
					// As the order seems to be different in some files, autodetect it.
					ValueType valueType = get_property_type(tmp1, tmp2);
					propertyName = get_property_name(tmp1, tmp2);

					if (propertyName == "x") {
						std::pair<VertexProperty, ValueType> entry(XCOORD, valueType);
						vertexPropertyMap_[vertexPropertyCount_] = entry;
						vertexDimension_++;
					} else if (propertyName == "y") {
						std::pair<VertexProperty, ValueType> entry(YCOORD, valueType);
						vertexPropertyMap_[vertexPropertyCount_] = entry;
						vertexDimension_++;
					} else if (propertyName == "z") {
						std::pair<VertexProperty, ValueType> entry(ZCOORD, valueType);
						vertexPropertyMap_[vertexPropertyCount_] = entry;
						vertexDimension_++;
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					} else if (propertyName == "u" || propertyName == "s") {
						std::pair<VertexProperty, ValueType> entry(TEXX, valueType);
						vertexPropertyMap_[vertexPropertyCount_] = entry;
						options_ += Options::VertexTexCoord;
					} else if (propertyName == "v" || propertyName == "t") {
						std::pair<VertexProperty, ValueType> entry(TEXY, valueType);
						vertexPropertyMap_[vertexPropertyCount_] = entry;
						options_ += Options::VertexTexCoord;
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					} else if (propertyName == "red") {
						std::pair<VertexProperty, ValueType> entry(COLORRED, valueType);
						vertexPropertyMap_[vertexPropertyCount_] = entry;
						options_ += Options::VertexColor;
					} else if (propertyName == "green") {
						std::pair<VertexProperty, ValueType> entry(COLORGREEN, valueType);
						vertexPropertyMap_[vertexPropertyCount_] = entry;
						options_ += Options::VertexColor;
					} else if (propertyName == "blue") {
						std::pair<VertexProperty, ValueType> entry(COLORBLUE, valueType);
						vertexPropertyMap_[vertexPropertyCount_] = entry;
						options_ += Options::VertexColor;
					} else if (propertyName == "alpha") {
						std::pair<VertexProperty, ValueType> entry(COLORALPHA, valueType);
						vertexPropertyMap_[vertexPropertyCount_] = entry;
						options_ += Options::VertexColor;
						options_ += Options::ColorAlpha;
					} else {
						std::pair<VertexProperty, ValueType> entry(UNSUPPORTED, valueType);
						vertexPropertyMap_[vertexPropertyCount_] = entry;
						std::cerr << "Unsupported property : " << propertyName << std::endl;
					}

					vertexPropertyCount_++;

				} else if (elementName == "face") {
					omerr() << "Properties not supported for faces " << std::endl;
				}

			}

		} else {
			omlog() << "Unsupported keyword : " << keyword << std::endl;
		}

		streamPos = _is.tellg();
		_is >> keyword;
		if (_is.bad()) {
			omerr() << "Error while reading PLY file header" << std::endl;
			return false;
		}
	}

	// As the binary data is directy after the end_header keyword
	// and the stream removes too many bytes, seek back to the right position
	if (options_.is_binary()) {
		_is.seekg(streamPos + 12);
	}

	return true;
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}

//=============================================================================
} // namespace IO
} // namespace OpenMesh
//=============================================================================