#ifndef STORM_UTILITY_CONSTANTS_H_
#define STORM_UTILITY_CONSTANTS_H_

#ifdef max
#	undef max
#endif

#ifdef min
#	undef min
#endif

#include <limits>
#include <cstdint>
#include <string>

#include <vector>
#include <map>

#include "storm/utility/NumberTraits.h"

namespace storm {

    // Forward-declare MatrixEntry class.
    namespace storage {
        template<typename IndexType, typename ValueType> class MatrixEntry;
    }
    
    template<typename RationalType>
    struct NumberTraits;

    namespace utility {

        namespace detail {
            template<typename ValueType>
            struct ElementLess {
                typedef std::less<ValueType> type;
            };
            
            struct DoubleLess {
                bool operator()(double a, double b) const {
                    return b - a > 1e-17;
                }
            };
            
            template<>
            struct ElementLess<double> {
                typedef DoubleLess type;
            };

            template<typename ValueType>
            struct ElementGreater {
                typedef std::greater<ValueType> type;
            };
            
            struct DoubleGreater {
                bool operator()(double a, double b) const {
                    return a - b > 1e-17;
                }
            };
            
            template<>
            struct ElementGreater<double> {
                typedef DoubleGreater type;
            };
        }
        
        template<typename ValueType>
        using ElementLess = typename detail::ElementLess<ValueType>::type;

        template<typename ValueType>
        using ElementGreater = typename detail::ElementGreater<ValueType>::type;

        template<typename ValueType>
        ValueType one();

        template<typename ValueType>
        ValueType zero();

        template<typename ValueType>
        ValueType infinity();

        template<typename ValueType>
        bool isOne(ValueType const& a);

        template<typename ValueType>
        bool isZero(ValueType const& a);

        bool isAlmostZero(double const& a);

        bool isAlmostOne(double const& a);
        
        template<typename ValueType>
        bool isConstant(ValueType const& a);

        template<typename ValueType>
        bool isInfinity(ValueType const& a);

        template<typename ValueType>
        bool isInteger(ValueType const& number);

        template<typename TargetType, typename SourceType>
        TargetType convertNumber(SourceType const& number);
        
        template<typename ValueType>
        std::pair<ValueType, ValueType> asFraction(ValueType const& number);

        template<typename ValueType>
        ValueType simplify(ValueType value);

        template<typename IndexType, typename ValueType>
        storm::storage::MatrixEntry<IndexType, ValueType>& simplify(storm::storage::MatrixEntry<IndexType, ValueType>& matrixEntry);
        
        template<typename IndexType, typename ValueType>
        storm::storage::MatrixEntry<IndexType, ValueType>&& simplify(storm::storage::MatrixEntry<IndexType, ValueType>&& matrixEntry);

        template<typename ValueType>
        std::pair<ValueType, ValueType> minmax(std::vector<ValueType> const& values);
        
        template<typename ValueType>
        ValueType minimum(std::vector<ValueType> const& values);
        
        template<typename ValueType>
        ValueType maximum(std::vector<ValueType> const& values);
        
        template< typename K, typename ValueType>
        std::pair<ValueType, ValueType> minmax(std::map<K, ValueType> const& values);
        
        template< typename K, typename ValueType>
        ValueType minimum(std::map<K, ValueType> const& values);
        
        template<typename K, typename ValueType>
        ValueType maximum(std::map<K, ValueType> const& values);
        
        template<typename ValueType>
        ValueType pow(ValueType const& value, uint_fast64_t exponent);

        template<typename ValueType>
        ValueType max(ValueType const& first, ValueType const& second);

        template<typename ValueType>
        ValueType min(ValueType const& first, ValueType const& second);

        template<typename ValueType>
        ValueType sqrt(ValueType const& number);
        
        template<typename ValueType>
        ValueType abs(ValueType const& number);

        template<typename ValueType>
        ValueType floor(ValueType const& number);

        template<typename ValueType>
        ValueType ceil(ValueType const& number);

        template<typename ValueType>
        ValueType log(ValueType const& number);

        template<typename ValueType>
        ValueType log10(ValueType const& number);

        template<typename ValueType>
        typename NumberTraits<ValueType>::IntegerType trunc(ValueType const& number);

        template<typename RationalType>
        typename NumberTraits<RationalType>::IntegerType numerator(RationalType const& number);

        template<typename RationalType>
        typename NumberTraits<RationalType>::IntegerType denominator(RationalType const& number);

        /*!
         * (Integer-)Divides the dividend by the divisor and returns the result plus the remainder.
         */
        template<typename IntegerType>
        std::pair<IntegerType, IntegerType> divide(IntegerType const& dividend, IntegerType const& divisor);

        template<typename IntegerType>
        IntegerType mod(IntegerType const& first, IntegerType const& second);
        
        template<typename ValueType>
        std::string to_string(ValueType const& value);
    }
}

#endif /* STORM_UTILITY_CONSTANTS_H_ */