/*

-----------------------------------------------------------------------------

This source file is part of OGRE

    (Object-oriented Graphics Rendering Engine)

For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2014 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

-----------------------------------------------------------------------------

*/

#include "OgreStableHeaders.h"

#include "OgreConfigFile.h"

#include "OgreResourceGroupManager.h"

#include <iostream>

namespace Ogre {

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

    ConfigFile::ConfigFile()

    {

    }

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

    void ConfigFile::clear(void)

    {

        mSettings.clear();

        mSettingsPtr.clear();

    }

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

    void ConfigFile::load(const String& filename, const String& separators, bool trimWhitespace)

    {

        loadDirect(filename, separators, trimWhitespace);

    }

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

    void ConfigFile::load(const String& filename, const String& resourceGroup, 

        const String& separators, bool trimWhitespace)

    {

        loadFromResourceSystem(filename, resourceGroup, separators, trimWhitespace);

    }

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

    void ConfigFile::loadDirect(const String& filename, const String& separators, 

        bool trimWhitespace)

    {

        load(_openFileStream(filename, std::ios::in | std::ios::binary), separators, trimWhitespace);

    }

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

    void ConfigFile::loadFromResourceSystem(const String& filename, 

        const String& resourceGroup, const String& separators, bool trimWhitespace)

    {

        DataStreamPtr stream = 

            ResourceGroupManager::getSingleton().openResource(filename, resourceGroup);

        load(stream, separators, trimWhitespace);

    }

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

    void ConfigFile::load(const DataStreamPtr& stream, const String& separators, 

        bool trimWhitespace)

    {

        /* Clear current settings map */

        clear();

        String currentSection = BLANKSTRING;

        SettingsMultiMap* currentSettings = &mSettings[currentSection];

        mSettingsPtr[currentSection] = currentSettings;

        /* Process the file line for line */

        String line, optName, optVal;

        while (!stream->eof())

        {

            line = stream->getLine();

            /* Ignore comments & blanks */

            if (line.length() > 0 && line.at(0) != '#' && line.at(0) != '@')

            {

                if (line.at(0) == '[' && line.at(line.length()-1) == ']')

                {

                    // Section

                    currentSection = line.substr(1, line.length() - 2);

                    currentSettings = &mSettings[currentSection];

                    mSettingsPtr[currentSection] = currentSettings;

                }

                else

                {

                    /* Find the first separator character and split the string there */

                    Ogre::String::size_type separator_pos = line.find_first_of(separators, 0);

                    if (separator_pos != Ogre::String::npos)

                    {

                        optName = line.substr(0, separator_pos);

                        /* Find the first non-separator character following the name */

                        Ogre::String::size_type nonseparator_pos = line.find_first_not_of(separators, separator_pos);

                        /* ... and extract the value */

                        /* Make sure we don't crash on an empty setting (it might be a valid value) */

                        optVal = (nonseparator_pos == Ogre::String::npos) ? "" : line.substr(nonseparator_pos);

                        if (trimWhitespace)

                        {

                            StringUtil::trim(optVal);

                            StringUtil::trim(optName);

                        }

                        currentSettings->emplace(optName, optVal);

                    }

                }

            }

        }

    }

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

    String ConfigFile::getSetting(const String& key, const String& section, const String& defaultValue) const

    {

        SettingsBySection_::const_iterator seci = mSettings.find(section);

        if (seci == mSettings.end())

        {

            return defaultValue;

        }

        else

        {

            SettingsMultiMap::const_iterator i = seci->second.find(key);

            if (i == seci->second.end())

            {

                return defaultValue;

            }

            else

            {

                return i->second;

            }

        }

    }

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

    StringVector ConfigFile::getMultiSetting(const String& key, const String& section) const

    {

        StringVector ret;

        SettingsBySection_::const_iterator seci = mSettings.find(section);

        if (seci != mSettings.end())

        {

            SettingsMultiMap::const_iterator i;

            i = seci->second.find(key);

            // Iterate over matches

            while (i != seci->second.end() && i->first == key)

            {

                ret.push_back(i->second);

                ++i;

            }

        }

        return ret;

    }

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

    ConfigFile::SettingsIterator ConfigFile::getSettingsIterator(const String& section)

    {

        SettingsBySection_::iterator seci = mSettings.find(section);

        if (seci == mSettings.end())

        {

            OGRE_EXCEPT(Exception::ERR_ITEM_NOT_FOUND, 

                "Cannot find section " + section, 

                "ConfigFile::getSettingsIterator");

        }

        return SettingsIterator(seci->second.begin(), seci->second.end());

    }

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

    const ConfigFile::SettingsMultiMap& ConfigFile::getSettings(const String& section) const

    {

        SettingsBySection_::const_iterator seci = mSettings.find(section);

        if (seci == mSettings.end())

        {

            OGRE_EXCEPT(Exception::ERR_ITEM_NOT_FOUND, 

                "Cannot find section " + section, 

                "ConfigFile::getSettings");

        }

        return seci->second;

    }

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

    ConfigFile::SectionIterator ConfigFile::getSectionIterator(void)

    {

        return SectionIterator(mSettingsPtr.begin(), mSettingsPtr.end());

    }

}