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////////////////////////////////////////////////////////////////////////
// Copyright (c) Nehmulos 2011-2014
// This file is part of N0 Strain Serialization Library.
//
// N0Strain-Serialization-Library 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.
//
// N0Strain-Serialization-Library 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 N0Strain-Serialization-Library.  If not, see https://gnu.org/licenses/lgpl-3.0
////////////////////////////////////////////////////////////////////////




#include "DescriberGen.h"

namespace nw {

DescriberGen::DescriberGen() {
}

DescriberGen::~DescriberGen() {
}

Describer* DescriberGen::readerForExtension(const String file) {
    String extension = file.substr(file.find_last_of(".") + 1);
    if(extension == "xml") {
        return new XmlReader(file);
    } else if(extension == "json") {
        return new JsonReader(file);
    } else if(extension == "bin") {
        return new BinaryReader(file);
    }
    return NULL;
}

Describer* DescriberGen::readerForHeader(String filename) {
    std::ifstream file;
    file.open(filename.c_str(), std::ios_base::in);
    const int headerSize = 2;
    char header[2] = {'\0', '\0'};

    if(file.fail()) {
        std::cerr << "Error file '" << filename <<  "' could not be opened\n";
        std::cerr << "Please check permissions and if the file exists under this path.";
        std::cerr << std::endl;
        return NULL;
    }

    int headerIndex = 0;
    while(!file.eof()) {
        char c;
        file.get(c);
        if(!nwIsSeparator(c)) {
            header[headerIndex] = c;
            headerIndex++;
            if(headerIndex >= headerSize)
                break;
        }
    }
    file.close();

    if(header[0] == N0Slib_Binary_ValidationBytes[0] && 
       header[1] == N0Slib_Binary_ValidationBytes[1]) {
        return new BinaryReader(filename);
    } else if(header[0] == '<') {
        if(header[1] != '\0') {
            return new XmlReader(filename);
        }
    } else if(header[0] == '{') {
        return new JsonReader(filename);
    }
    return NULL;
}

}  // namespace nw