/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_slideshow.hxx"

// must be first
#include <canvas/debug.hxx>
#include <expressionnodefactory.hxx>

#include <canvas/verbosetrace.hxx>

#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/point/b2dpoint.hxx>

#include <functional>
#include <algorithm>


/* Implementation of ExpressionNodeFactory class */

namespace slideshow
{
    namespace internal
    {
        namespace
        {
            class ConstantValueExpression : public ExpressionNode
            {
            public:
                ConstantValueExpression( double rValue ) :
                    maValue( rValue )
                {
                }

                virtual double operator()( double /*t*/ ) const
                {
                    return maValue;
                }

                virtual bool isConstant() const
                {
                    return true;
                }

            private:
                double	maValue;
            };

            class TValueExpression : public ExpressionNode
            {
            public:
                TValueExpression()
                {
                }

                virtual double operator()( double t ) const
                {
                    return t;
                }
                    
                virtual bool isConstant() const
                {
                    return false;
                }
            };

            /** Base class for following binary functions (*+-/)

				Does not pay off to have all this as a template, since
				we'd have to hold the functor as a member (+33% object
				size).
             */
            class BinaryExpressionBase : public ExpressionNode
            {
            public:
                BinaryExpressionBase( const ExpressionNodeSharedPtr&	rFirstArg,
                                      const ExpressionNodeSharedPtr&	rSecondArg ) :
                    mpFirstArg( rFirstArg ),
                    mpSecondArg( rSecondArg )
                {
                }

                virtual bool isConstant() const
                {
                    return 
                        mpFirstArg->isConstant() && 
                        mpSecondArg->isConstant();
                }

            protected:
                ExpressionNodeSharedPtr	mpFirstArg;
                ExpressionNodeSharedPtr mpSecondArg;
            };

            class PlusExpression : public BinaryExpressionBase
            {
            public:
                PlusExpression( const ExpressionNodeSharedPtr&	rFirstArg,
                                const ExpressionNodeSharedPtr&	rSecondArg ) :
                    BinaryExpressionBase( rFirstArg, rSecondArg )
                {
                }

                virtual double operator()( double t ) const
                {
                    return (*mpFirstArg)(t) + (*mpSecondArg)(t);
                }
            };

            class MinusExpression : public BinaryExpressionBase
            {
            public:
                MinusExpression( const ExpressionNodeSharedPtr&	rFirstArg,
                                 const ExpressionNodeSharedPtr&	rSecondArg ) :
                    BinaryExpressionBase( rFirstArg, rSecondArg )
                {
                }

                virtual double operator()( double t ) const
                {
                    return (*mpFirstArg)(t) - (*mpSecondArg)(t);
                }
            };

            class MultipliesExpression : public BinaryExpressionBase
            {
            public:
                MultipliesExpression( const ExpressionNodeSharedPtr&	rFirstArg,
                                      const ExpressionNodeSharedPtr&	rSecondArg ) :
                    BinaryExpressionBase( rFirstArg, rSecondArg )
                {
                }

                virtual double operator()( double t ) const
                {
                    return (*mpFirstArg)(t) * (*mpSecondArg)(t);
                }                    
            };

            class DividesExpression : public BinaryExpressionBase
            {
            public:
                DividesExpression( const ExpressionNodeSharedPtr&	rFirstArg,
                                   const ExpressionNodeSharedPtr&	rSecondArg ) :
                    BinaryExpressionBase( rFirstArg, rSecondArg )
                {
                }

                virtual double operator()( double t ) const
                {
                    return (*mpFirstArg)(t) / (*mpSecondArg)(t);
                }                    
            };

            class ComposedExpression : public BinaryExpressionBase
            {
            public:
                ComposedExpression( const ExpressionNodeSharedPtr&	rFirstArg,
                                    const ExpressionNodeSharedPtr&	rSecondArg ) :
                    BinaryExpressionBase( rFirstArg, rSecondArg )
                {
                }

                virtual double operator()( double t ) const
                {
                    return (*mpFirstArg)( (*mpSecondArg)(t) );
                }
            };

            class MinExpression : public BinaryExpressionBase
            {
            public:
                MinExpression( const ExpressionNodeSharedPtr&	rFirstArg,
                               const ExpressionNodeSharedPtr&	rSecondArg ) :
                    BinaryExpressionBase( rFirstArg, rSecondArg )
                {
                }

                virtual double operator()( double t ) const
                {
                    return ::std::min( (*mpFirstArg)(t), (*mpSecondArg)(t) );
                }
            };

            class MaxExpression : public BinaryExpressionBase
            {
            public:
                MaxExpression( const ExpressionNodeSharedPtr&	rFirstArg,
                               const ExpressionNodeSharedPtr&	rSecondArg ) :
                    BinaryExpressionBase( rFirstArg, rSecondArg )
                {
                }

                virtual double operator()( double t ) const
                {
                    return ::std::max( (*mpFirstArg)(t), (*mpSecondArg)(t) );
                }
            };
        }

        ExpressionNodeSharedPtr ExpressionNodeFactory::createConstantValueExpression( double rConstantValue )
        {
            return ExpressionNodeSharedPtr( new ConstantValueExpression(rConstantValue) );
        }
        
        ExpressionNodeSharedPtr ExpressionNodeFactory::createValueTExpression()
        {
            return ExpressionNodeSharedPtr( new TValueExpression() );
        }

        ExpressionNodeSharedPtr ExpressionNodeFactory::createPlusExpression( const ExpressionNodeSharedPtr&	rLHS,
                                                                             const ExpressionNodeSharedPtr&	rRHS )
        {
            return ExpressionNodeSharedPtr( new PlusExpression(rLHS, rRHS) );
        }

        ExpressionNodeSharedPtr ExpressionNodeFactory::createMinusExpression( const ExpressionNodeSharedPtr&	rLHS,
                                                                              const ExpressionNodeSharedPtr&	rRHS )
        {
            return ExpressionNodeSharedPtr( new MinusExpression(rLHS, rRHS) );
        }

        ExpressionNodeSharedPtr ExpressionNodeFactory::createMultipliesExpression( const ExpressionNodeSharedPtr&	rLHS,
                                                                                   const ExpressionNodeSharedPtr&	rRHS )
        {
            return ExpressionNodeSharedPtr( new MultipliesExpression(rLHS, rRHS) );
        }

        ExpressionNodeSharedPtr ExpressionNodeFactory::createDividesExpression( const ExpressionNodeSharedPtr&	rLHS,
                                                                                const ExpressionNodeSharedPtr&	rRHS )
        {
            return ExpressionNodeSharedPtr( new DividesExpression(rLHS, rRHS) );
        }

        ExpressionNodeSharedPtr ExpressionNodeFactory::createComposedExpression	 ( const ExpressionNodeSharedPtr&	rOuterFunction,
                                                                                   const ExpressionNodeSharedPtr&	rInnerFunction )
        {
            return ExpressionNodeSharedPtr( new ComposedExpression(rOuterFunction, rInnerFunction) );
        }

        ExpressionNodeSharedPtr ExpressionNodeFactory::createMinExpression	 ( const ExpressionNodeSharedPtr&	rOuterFunction,
                                                                               const ExpressionNodeSharedPtr&	rInnerFunction )
        {
            return ExpressionNodeSharedPtr( new MinExpression(rOuterFunction, rInnerFunction) );
        }

        ExpressionNodeSharedPtr ExpressionNodeFactory::createMaxExpression	 ( const ExpressionNodeSharedPtr&	rOuterFunction,
                                                                               const ExpressionNodeSharedPtr&	rInnerFunction )
        {
            return ExpressionNodeSharedPtr( new MaxExpression(rOuterFunction, rInnerFunction) );
        }
        
    }
}