//          Copyright Joakim Karlsson & Kim Gräsman 2010-2012.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

#ifndef SNOWHOUSE_CONTAINSCONSTRAINT_H
#define SNOWHOUSE_CONTAINSCONSTRAINT_H

#include <algorithm>
#include <map>

#include "expressions/expression.h"

namespace snowhouse
{
  template<typename ContainerType>
  struct find_in_container_traits
  {
    template<typename ExpectedType>
    static bool find(const ContainerType& container, const ExpectedType& expected)
    {
      return std::find(container.begin(), container.end(), expected) != container.end();
    }
  };

  template<typename KeyType, typename ValueType>
  struct find_in_container_traits<std::map<KeyType, ValueType>>
  {
    template<typename ExpectedType>
    static bool find(const std::map<KeyType, ValueType>& container, const ExpectedType& expected)
    {
      return container.find(expected) != container.end();
    }
  };

  template<typename ExpectedType>
  struct ContainsConstraint : Expression<ContainsConstraint<ExpectedType>>
  {
    ContainsConstraint(const ExpectedType& expected)
        : m_expected(expected)
    {
    }

    template<typename ActualType>
    bool operator()(const ActualType& actual) const
    {
      return find_in_container_traits<ActualType>::find(actual, m_expected);
    }

    bool operator()(const std::string& actual) const
    {
      return actual.find(m_expected) != std::string::npos;
    }

    ExpectedType m_expected;
  };

  template<typename ExpectedType>
  inline ContainsConstraint<ExpectedType> Contains(const ExpectedType& expected)
  {
    return ContainsConstraint<ExpectedType>(expected);
  }

  inline ContainsConstraint<std::string> Contains(const char* expected)
  {
    return ContainsConstraint<std::string>(expected);
  }

  template<typename ExpectedType>
  struct Stringizer<ContainsConstraint<ExpectedType>>
  {
    static std::string ToString(const ContainsConstraint<ExpectedType>& constraint)
    {
      std::ostringstream builder;
      builder << "contains " << snowhouse::Stringize(constraint.m_expected);

      return builder.str();
    }
  };
}

#endif
