/*    Copyright 2012 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    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 Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects
 *    for all of the code used other than as permitted herein. If you modify
 *    file(s) with this exception, you may extend this exception to your
 *    version of the file(s), but you are not obligated to do so. If you do not
 *    wish to do so, delete this exception statement from your version. If you
 *    delete this exception statement from all source files in the program,
 *    then also delete it in the license file.
 */

/** Unit tests for OwnedPointerMap. */

#include "mongo/base/owned_pointer_map.h"

#include <string>
#include <vector>

#include "mongo/unittest/unittest.h"

namespace mongo {
namespace {

    using std::make_pair;

    /** Helper class that logs its constructor argument to a static vector on destruction. */
    class DestructionLogger {
    public:
        DestructionLogger( const string& name ) :
            _name( name ) {
        }
        ~DestructionLogger() { _destroyedNames.push_back( _name ); }

        static std::vector<string>& destroyedNames() { return _destroyedNames; }

        string getName() { return _name; }

    private:
        string _name;
        static std::vector<string> _destroyedNames;
    };

    std::vector<string> DestructionLogger::_destroyedNames;

    TEST(OwnedPointerMapTest, OwnedPointerDestroyed) {
        DestructionLogger::destroyedNames().clear();
        {
            OwnedPointerMap<int,DestructionLogger> owned;
            owned.mutableMap().insert( make_pair( 0, new DestructionLogger( "foo" ) ) );
            // owned destroyed
        }
        ASSERT_EQUALS( 1U, DestructionLogger::destroyedNames().size() );
        ASSERT_EQUALS( "foo", DestructionLogger::destroyedNames()[ 0 ] );
    }

    TEST(OwnedPointerMapTest, OwnedConstPointerDestroyed) {
        DestructionLogger::destroyedNames().clear();
        {
            OwnedPointerMap<int,const DestructionLogger> owned;
            owned.mutableMap().insert( make_pair( 0, new DestructionLogger( "foo" ) ) );
            // owned destroyed
        }
        ASSERT_EQUALS( 1U, DestructionLogger::destroyedNames().size() );
        ASSERT_EQUALS( "foo", DestructionLogger::destroyedNames()[ 0 ] );
    }

    TEST(OwnedPointerMapTest, OwnedPointersDestroyedInOrder) {
        DestructionLogger::destroyedNames().clear();
        {
            OwnedPointerMap<int,DestructionLogger> owned;
            owned.mutableMap().insert( make_pair( 0, new DestructionLogger( "first" ) ) );
            owned.mutableMap().insert( make_pair( 1, new DestructionLogger( "second" ) ) );
            // owned destroyed
        }
        ASSERT_EQUALS( 2U, DestructionLogger::destroyedNames().size() );
        ASSERT_EQUALS( "first", DestructionLogger::destroyedNames()[ 0 ] );
        ASSERT_EQUALS( "second", DestructionLogger::destroyedNames()[ 1 ] );
    }
    
    TEST(OwnedPointerMapTest, OwnedPointersWithCompare) {
        DestructionLogger::destroyedNames().clear();
        {
            OwnedPointerMap<int,DestructionLogger,std::greater<int> > owned;
            owned.mutableMap().insert( make_pair( 0, new DestructionLogger( "0" ) ) );
            owned.mutableMap().insert( make_pair( 1, new DestructionLogger( "1" ) ) );

            // use std::greater<int> rather than the default std::less<int>
            std::map<int,DestructionLogger*,std::greater<int> >::iterator it = owned.mutableMap().begin();

            ASSERT( owned.mutableMap().end() != it);
            // "1" should be sorted to be the first item.
            ASSERT_EQUALS( "1", it->second->getName() );

            it++;
            ASSERT( owned.mutableMap().end() != it);
            ASSERT_EQUALS( "0", it->second->getName() );

            // owned destroyed
        }
        // destroyed in descending order
        ASSERT_EQUALS( 2U, DestructionLogger::destroyedNames().size() );
        ASSERT_EQUALS( "1", DestructionLogger::destroyedNames()[ 0 ] );
        ASSERT_EQUALS( "0", DestructionLogger::destroyedNames()[ 1 ] );
    }


} // namespace
} // namespace mongo
