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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2013 Pelican Mapping
* http://osgearth.org
*
* osgEarth 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 2 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/>
*/

#ifndef OSGEARTH_CACHE_POLICY_H
#define OSGEARTH_CACHE_POLICY_H 1

#include <osgEarth/Common>
#include <osgEarth/Config>
#include <osgDB/Options>

namespace osgEarth
{
    /**
     * Policy for cache usage.
     */
    class OSGEARTH_EXPORT CachePolicy
    {
    public:
        enum Usage
        {
            USAGE_READ_WRITE   = 0,  // read/write to the cache if one exists.
            USAGE_CACHE_ONLY   = 1,  // treat the cache as the ONLY source of data.
            USAGE_READ_ONLY    = 2,  // read from the cache, but don't write new data to it.
            USAGE_NO_CACHE     = 3   // neither read from or write to the cache
        };

        /** default cache policy (READ_WRITE) */
        static CachePolicy DEFAULT;

        /* policy indicating to never use a cache */
        static CachePolicy NO_CACHE;

        /** policy indicating to only use a cache */
        static CachePolicy CACHE_ONLY;

    public:
        /** constructs an invalid CachePolicy. */
        CachePolicy();

        /** constructs a caching policy. */
        CachePolicy( const Usage& usage );

        /** constructs a caching policy. */
        CachePolicy( const Usage& usage, double maxAgeSeconds );

        /** constructs a CachePolicy from a config options */
        CachePolicy( const Config& conf );

        /** construct a cache policy be reading it from an osgDB::Options */
        static bool fromOptions( const osgDB::Options* dbOptions, optional<CachePolicy>& out_policy );

        /** Stores this cache policy in a DB Options. */
        void apply( osgDB::Options* options );

        /** dtor */
        virtual ~CachePolicy() { }

        /** Gets the usage policy */
        optional<Usage>& usage() { return _usage; }
        const optional<Usage>& usage() const { return _usage; }

        /** Gets the age limit for a cache record (in seconds) */
        optional<double>& maxAge() { return _maxAge; }
        const optional<double>& maxAge() const { return _maxAge; }

    public: // convenience functions.

        bool isCacheReadable() const { 
            return *_usage == USAGE_READ_WRITE || *_usage == USAGE_CACHE_ONLY || *_usage == USAGE_READ_ONLY;
        }

        bool isCacheWriteable() const {
            return *_usage == USAGE_READ_WRITE;
        }

        bool operator == ( const CachePolicy& rhs ) const;

        bool operator != ( const CachePolicy& rhs ) const {
            return ! operator==(rhs);
        }

        std::string usageString() const;

    public: // config
        Config getConfig() const;
        void fromConfig( const Config& conf );

    private:
        optional<Usage>   _usage;
        optional<double>  _maxAge;
    };
}

#endif // OSGEARTH_CACHE_POLICY_H