/*
 *  The Mana Server
 *  Copyright (C) 2004-2010  The Mana World Development Team
 *
 *  This file is part of The Mana Server.
 *
 *  The Mana Server 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 2 of the License, or
 *  any later version.
 *
 *  The Mana Server 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 The Mana Server.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "common/resourcemanager.hpp"

#include "common/configuration.hpp"

#include "utils/logger.h"

#include <cstdlib>
#include <cstring>

#ifdef _WIN32
#include <io.h>
#include <direct.h>
#else
#include <unistd.h>
#include <dirent.h>
#endif

#include <physfs.h>

#define PKG_DATADIR ""

void ResourceManager::initialize()
{
    PHYSFS_permitSymbolicLinks(1);

    const std::string clientDataPath =
            Configuration::getValue("clientDataPath", "example/clientdata");
    const std::string serverDataPath =
            Configuration::getValue("serverDataPath", "example/serverdata");

    PHYSFS_addToSearchPath(clientDataPath.c_str(), 1);
    PHYSFS_addToSearchPath(serverDataPath.c_str(), 1);
}

bool ResourceManager::exists(const std::string &path)
{
    return PHYSFS_exists(path.c_str());
}

char *ResourceManager::loadFile(const std::string &fileName, int &fileSize,
                                             bool removeBOM)
{
    // Attempt to open the specified file using PhysicsFS
    PHYSFS_file* file = PHYSFS_openRead(fileName.c_str());

    // If the handler is an invalid pointer indicate failure
    if (file == NULL)
    {
        LOG_WARN("Failed to load '" << fileName << "': "
                 << PHYSFS_getLastError());
        return NULL;
    }

    // Get the size of the file
    fileSize = PHYSFS_fileLength(file);

    if (removeBOM)
    {
        // Inspired by BOMstrip from Peter Pentchev, 2008, public domain.
        const char utf8Bom[] = "\xef\xbb\xbf";
        const int bomLength = sizeof(utf8Bom);
        char bomBuffer[bomLength];
        PHYSFS_read(file, bomBuffer, 1, bomLength);

        std::istringstream iss(std::string(bomBuffer, bomLength));
        std::string line;

        // if we find a BOM, then we remove it from the buffer
        if (std::getline(iss, line) && !line.substr(0, 3).compare(utf8Bom))
        {
            LOG_INFO("Found a Byte Order Mask (BOM) in '" << fileName);
            fileSize = fileSize - bomLength;
        }
        else
        {
            // No BOM, we get back to the file start.
            PHYSFS_seek(file, 0);
        }
    }

    // Allocate memory and load the file
    char *buffer = (char *) malloc(fileSize + 1);
    if (PHYSFS_read(file, buffer, 1, fileSize) != fileSize)
    {
        free(buffer);
        LOG_WARN("Failed to load '" << fileName << "': "
                 << PHYSFS_getLastError());
        return NULL;
    }

    // Close the file and let the user deallocate the memory
    PHYSFS_close(file);

    // Add a trailing null character, so that the file can be used as a string
    buffer[fileSize] = 0;
    return buffer;
}