/************
*
*   This file is part of a tool for reading 3D content in the PRC format.
*   Copyright (C) 2008 Orest Shardt <shardtor (at) gmail dot com>
*
*   This program is free software: you can redistribute it and/or modify
*   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.
*
*   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 Lesser General Public License for more details.
*
*   You should have received a copy of the GNU Lesser General Public License
*   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
*************/

#include "bitData.h"
#include "iPRCFile.h"
#include "describePRC.h"

using std::vector; using std::istream; using std::ios;
using std::cout; using std::endl; using std::cerr;
using std::string;

using std::ofstream;
using std::ostringstream;

void iPRCFile::dumpSections(string prefix)
{
 ofstream out;

 for(unsigned int i = 0; i < fileStructures.size(); ++i)
 {
   ostringstream name;
   name << prefix << "Structure" << i;

   out.open((name.str()+"-Globals.bin").c_str());
   out.write(fileStructures[i].sections[GLOBALS_SECTION],fileStructures[i].sectionLengths[GLOBALS_SECTION]);
   out.close();

   out.open((name.str()+"-Tree.bin").c_str());
   out.write(fileStructures[i].sections[TREE_SECTION],fileStructures[i].sectionLengths[TREE_SECTION]);
   out.close();

   out.open((name.str()+"-Tessellation.bin").c_str());
   out.write(fileStructures[i].sections[TESSELLATION_SECTION],fileStructures[i].sectionLengths[TESSELLATION_SECTION]);
   out.close();

   out.open((name.str()+"-Geometry.bin").c_str());
   out.write(fileStructures[i].sections[GEOMETRY_SECTION],fileStructures[i].sectionLengths[GEOMETRY_SECTION]);
   out.close();

   out.open((name.str()+"-ExtraGeometry.bin").c_str());
   out.write(fileStructures[i].sections[EXTRA_GEOMETRY_SECTION],fileStructures[i].sectionLengths[EXTRA_GEOMETRY_SECTION]);
   out.close();
 }
 out.open((prefix+"-ModelFile.bin").c_str());
 out.write(modelFileData,modelFileLength);
 out.close();
}

void iPRCFile::describe()
{
 /*
 for(int i = 0; i < modelFileLength; ++i)
 {
   cout << ' ' << std::hex << std::setw(2) << std::setfill('0') << static_cast<unsigned int>(static_cast<unsigned char>(mfd.readChar()));
   if(i%16 == 15)
     cout << endl;
 }
 cout << endl;
 */

 unFlushSerialization();
 for(unsigned int i = 0; i < fileStructures.size(); ++i)
 {
   cout << "File Structure " << i << ":" << endl;

   //describe header
   char *header = buffer + fileStructureInfos[i].offsets[0];
   cout << "--Header Section--" << endl;
   cout << "  Signature " << header[0] << header[1] << header[2] << endl;
   cout << "  Minimal version for read " << *(unsigned int*)(header+3) << endl;
   cout << "  Authoring version " << *(unsigned int*)(header+7) << endl;
   cout << std::hex;
   cout << "  File structure UUID " << *(unsigned int*)(header+11) << ' ' << *(unsigned int*)(header+15) << ' '
       << *(unsigned int*)(header+19) << ' ' << *(unsigned int*)(header+23) << endl;
   cout << "  Application UUID " << *(unsigned int*)(header+27) << ' ' << *(unsigned int*)(header+31) << ' '
       << *(unsigned int*)(header+35) << ' ' << *(unsigned int*)(header+39) << endl;
   cout << std::dec;
   // uncompressed files
   unsigned int numberOfUncompressedFiles = *(unsigned int*)(header+43);
   cout << "Number of uncompressed files " << numberOfUncompressedFiles << endl;
   char *position = header+47;
   for(unsigned int j = 0; j < numberOfUncompressedFiles; ++j)
   {
     cout << "Uncompressed file " << j << ":" << endl;
     unsigned int size = *(unsigned int*)position;
     cout << "  size " << size << " bytes" << endl;
     position += size+sizeof(unsigned int);
   }

   BitByBitData fileStruct(fileStructures[i].sections[GLOBALS_SECTION],fileStructures[i].sectionLengths[GLOBALS_SECTION]);
   describeSchema(fileStruct);
   describeGlobals(fileStruct);
   unFlushSerialization();

   fileStruct = BitByBitData(fileStructures[i].sections[TREE_SECTION],fileStructures[i].sectionLengths[TREE_SECTION]);
   describeTree(fileStruct);
   unFlushSerialization();

   fileStruct = BitByBitData(fileStructures[i].sections[TESSELLATION_SECTION],fileStructures[i].sectionLengths[TESSELLATION_SECTION]);
   describeTessellation(fileStruct);
   unFlushSerialization();

   fileStruct = BitByBitData(fileStructures[i].sections[GEOMETRY_SECTION],fileStructures[i].sectionLengths[GEOMETRY_SECTION]);
   describeGeometry(fileStruct);
   unFlushSerialization();

   fileStruct = BitByBitData(fileStructures[i].sections[EXTRA_GEOMETRY_SECTION],fileStructures[i].sectionLengths[EXTRA_GEOMETRY_SECTION]);
   describeExtraGeometry(fileStruct);
   unFlushSerialization();
 }

 BitByBitData mfd(modelFileData,modelFileLength);

 describeSchema(mfd);
 describeModelFileData(mfd,fileStructures.size());
 unFlushSerialization();
}

iPRCFile::iPRCFile(istream& in)
{
 char PRC[3];
 in.read(PRC,3);
 if(PRC[0] != 'P' || PRC[1] != 'R' || PRC[2] != 'C')
 {
   cerr << "Error: Invalid file format: PRC not found." << endl;
 }
 unsigned int versionForRead,authoringVersion;
 in.read((char*)&versionForRead,sizeof(versionForRead));
 in.read((char*)&authoringVersion,sizeof(authoringVersion));
 cout << "Version for reading " << versionForRead << endl;
 cout << "Authoring version " << authoringVersion << endl;
 unsigned int fileStructureUUID[4];
 in.read((char*)fileStructureUUID,sizeof(fileStructureUUID));
 //(void*) is for formatting
 cout << "File structure UUID " << (void*)(fileStructureUUID[0]) << ' ' << (void*)(fileStructureUUID[1]) << ' '
     << (void*)(fileStructureUUID[2]) << ' ' << (void*)(fileStructureUUID[3]) << endl;
 unsigned int applicationUUID[4];
 in.read((char*)applicationUUID,sizeof(applicationUUID));
 cout << "Application UUID " << (void*)(applicationUUID[0]) << ' ' << (void*)(applicationUUID[1]) << ' '
     << (void*)(applicationUUID[2]) << ' ' << (void*)(applicationUUID[3]) << endl;
 unsigned int numberOfFileStructures;
 in.read((char*)&numberOfFileStructures,sizeof(numberOfFileStructures));
 cout << "number of file structures " << numberOfFileStructures << endl;

 // load fileStructureInformation
 for(unsigned int fsi = 0; fsi < numberOfFileStructures; ++fsi)
 {
   FileStructureInformation info;
   in.read((char*)&info.UUID,sizeof(info.UUID));
   cout << "\tFile structure UUID " << (void*)(info.UUID[0]) << ' ' << (void*)(info.UUID[1]) << ' '
       << (void*)(info.UUID[2]) << ' ' << (void*)(info.UUID[3]) << endl;

   in.read((char*)&info.reserved,sizeof(info.reserved));
   cout << "\tReserved " << info.reserved << endl;

   unsigned int numberOfOffsets;
   in.read((char*)&numberOfOffsets,sizeof(numberOfOffsets));
   cout << "\tNumber of Offsets " << numberOfOffsets << endl;

   for(unsigned int oi = 0; oi < numberOfOffsets; ++oi)
   {
     unsigned int offset;
     in.read((char*)&offset,sizeof(offset));
     info.offsets.push_back(offset);
     cout << "\t\tOffset " << offset << endl;
   }
   fileStructureInfos.push_back(info);
 }
 in.read((char*)&modelFileOffset,sizeof(modelFileOffset));
 cout << "Model file offset " << modelFileOffset << endl;
 in.read((char*)&fileSize,sizeof(fileSize)); // this is not documented
 cout << "File size " << fileSize << endl;

 in.read((char*)&numberOfUncompressedFiles,sizeof(numberOfUncompressedFiles));
 cout << "Number of uncompressed files " << numberOfUncompressedFiles << endl;
 for(unsigned int ufi = 0; ufi < numberOfUncompressedFiles; ++ufi)
 {
   unsigned int size;
   in.read((char*)&size,sizeof(size));
   in.seekg(size,ios::cur);
 }

 //read the whole file into memory
 in.seekg(0,ios::beg);
 buffer = new char[fileSize];
 if(!buffer) cerr << "Couldn't get memory." << endl;
 in.read(buffer,fileSize);
 //decompress fileStructures
 for(unsigned int fs = 0; fs < fileStructureInfos.size(); ++fs)
 {
   fileStructures.push_back(FileStructure());
   for(unsigned int i = 1; i < fileStructureInfos[fs].offsets.size(); ++i) // start at 1 since header is decompressed
   {
     fileStructures[fs].sections[i-1] = NULL;
     unsigned int offset = fileStructureInfos[fs].offsets[i];
     fileStructures[fs].sectionLengths[i-1] = decompress(buffer+offset,fileSize-offset,fileStructures[fs].sections[i-1]);
   }
 }

 //decompress modelFileData
 modelFileData = NULL;
 modelFileLength = decompress(buffer+modelFileOffset,fileSize-modelFileOffset,modelFileData);
}

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