/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2019 CERN
 * Copyright (C) 2019-2021 KiCad Developers, see AUTHORS.TXT for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-3.0.html
 * or you may search the http://www.gnu.org website for the version 3 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef INCLUDE_CORE_KICAD_ALGO_H_
#define INCLUDE_CORE_KICAD_ALGO_H_

#include <algorithm>
#include <functional> // std::function
#include <utility>    // std::pair
#include <wx/debug.h> // wxCHECK_MSG

namespace alg
{
/**
 *  @brief Apply a function to the first and second element of a std::pair
 *  @param  __pair   A pair of elements (both elements must be the same type).
 *  @param  __f      A unary function object.
 *
 *  Applies the function object @p __f to @p __pair.first and @p __pair.second
 *  If @p __f has a return value it is ignored.
*/
template <typename _Type, typename _Function>
void run_on_pair( std::pair<_Type, _Type>& __pair, _Function __f )
{
    __f( __pair.first );
    __f( __pair.second );
}

/**
 *  @brief Apply a function to every sequential pair of elements of a sequence.
 *  @param  __first  An input iterator.
 *  @param  __last   An input iterator.
 *  @param  __f      A unary function object.
 *
 *  Applies the function object @p __f to each sequential pair of elements in the range
 *  @p [first,last).  @p __f must not modify the order of the sequence.
 *  If @p __f has a return value it is ignored.
*/
template <typename _InputIterator, typename _Function>
void adjacent_pairs( _InputIterator __first, _InputIterator __last, _Function __f )
{
    if( __first != __last )
    {
        _InputIterator __follow = __first;
        ++__first;
        for( ; __first != __last; ++__first, ++__follow )
            __f( *__follow, *__first );
    }
}

/**
 *  @brief Apply a function to every possible pair of elements of a sequence.
 *  @param  __first  An input iterator.
 *  @param  __last   An input iterator.
 *  @param  __f      A unary function object.
 *
 *  Applies the function object @p __f to every possible pair of elements in the range
 *  @p [first,last).  @p __f must not modify the order of the sequence.
 *  If @p __f has a return value it is ignored.
*/
template <typename _InputIterator, typename _Function>
void for_all_pairs( _InputIterator __first, _InputIterator __last, _Function __f )
{
    if( __first != __last )
    {
        _InputIterator __follow = __first;
        ++__first;
        for( ; __first != __last; ++__first, ++__follow )
            for( _InputIterator __it = __first; __it != __last; ++__it )
                __f( *__follow, *__it );
    }
}

/**
 * @brief Returns true if the container contains the given value.
 */
template <class _Container, typename _Value>
bool contains( const _Container& __container, _Value __value )
{
    return std::find( __container.begin(), __container.end(), __value ) != __container.end();
}

/**
 * @brief Returns true if either of the elements in an std::pair contains the given value
 *
 * @param  __pair   A pair of elements (both elements must be the same type).
 * @param  __value  A value to test
 * @return true if @p __value is contained in @p __pair
 */
template <typename _Type, typename _Value>
bool pair_contains( const std::pair<_Type, _Type> __pair, _Value __value )
{
    return __pair.first == static_cast<_Type>( __value )
           || __pair.second == static_cast<_Type>( __value );
}

/**
 * @brief Test if __val lies within __minval and __maxval in a wrapped range.
 *
 * @param  __val     A value to test
 * @param  __minval  Lowest permissible value within the wrapped range
 * @param  __maxval  Highest permissible value within the wrapped range
 * @param  __wrap    Value at which the range wraps around itself (must be positive)
 * @return true if @p __val lies in the wrapped range
 */
template <class T>
bool within_wrapped_range( T __val, T __minval, T __maxval, T __wrap )
{
    wxCHECK_MSG( __wrap > 0, false, wxT( "Wrap must be positive!" ) );

    while( __maxval >= __wrap )
        __maxval -= __wrap;

    while( __maxval < 0 )
        __maxval += __wrap;

    while( __minval >= __wrap )
        __minval -= __wrap;

    while( __minval < 0 )
        __minval += __wrap;

    while( __val < 0 )
        __val += __wrap;

    while( __val >= __wrap )
        __val -= __wrap;

    if( __maxval > __minval )
        return __val >= __minval && __val <= __maxval;
    else
        return __val >= __minval || __val <= __maxval;
}

/**
 * Covers for the horrifically named std::remove and std::remove_if (neither of which remove
 * anything).
 */
/**
 * @brief Deletes all values from \a __c which match \a __value.
 */
template <class _Container, typename _Value>
void delete_matching( _Container& __c, _Value __value )
{
    __c.erase( std::remove( __c.begin(), __c.end(), __value ), __c.end() );
}

/**
 * @brief Deletes all values from \a __c for which \a __f returns true.
 */
template <class _Container, class _Function>
void delete_if( _Container& __c, _Function&& __f )
{
    __c.erase( std::remove_if( __c.begin(), __c.end(), std::forward<_Function>( __f ) ), __c.end() );
}


/**
 * @brief Integral version of std::signbit that works all compilers.
 */
template <typename T, std::enable_if_t<std::is_integral<T>::value, int> = 0>
bool signbit( T v )
{
    return v < 0;
}


} // namespace alg

#endif /* INCLUDE_CORE_KICAD_ALGO_H_ */