// SPDX-License-Identifier: Apache-2.0
// 
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
// 
// Licensed 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.
// ------------------------------------------------------------------------


//! \addtogroup fn_find
//! @{



template<typename T1>
arma_warn_unused
inline
typename
enable_if2
  <
  is_arma_type<T1>::value,
  const mtOp<uword, T1, op_find_simple>
  >::result
find(const T1& X)
  {
  arma_debug_sigprint();
  
  return mtOp<uword, T1, op_find_simple>(X);
  }



template<typename T1>
arma_warn_unused
inline
const mtOp<uword, T1, op_find>
find(const Base<typename T1::elem_type,T1>& X, const uword k, const char* direction = "first")
  {
  arma_debug_sigprint();
  
  const char sig = (direction != nullptr) ? direction[0] : char(0);
  
  arma_conform_check
    (
    ( (sig != 'f') && (sig != 'F') && (sig != 'l') && (sig != 'L') ),
    "find(): direction must be \"first\" or \"last\""
    );
  
  const uword type = ( (sig == 'f') || (sig == 'F') ) ? 0 : 1;
  
  return mtOp<uword, T1, op_find>(X.get_ref(), k, type);
  }



//



template<typename T1>
arma_warn_unused
inline
uvec
find(const BaseCube<typename T1::elem_type,T1>& X)
  {
  arma_debug_sigprint();
  
  typedef typename T1::elem_type eT;
  
  const unwrap_cube<T1> tmp(X.get_ref());
  
  const Mat<eT> R( const_cast< eT* >(tmp.M.memptr()), tmp.M.n_elem, 1, false );
  
  return find(R);
  }



template<typename T1>
arma_warn_unused
inline
uvec
find(const BaseCube<typename T1::elem_type,T1>& X, const uword k, const char* direction = "first")
  {
  arma_debug_sigprint();
  
  typedef typename T1::elem_type eT;
  
  const unwrap_cube<T1> tmp(X.get_ref());
  
  const Mat<eT> R( const_cast< eT* >(tmp.M.memptr()), tmp.M.n_elem, 1, false );
  
  return find(R, k, direction);
  }



template<typename T1, typename op_rel_type>
arma_warn_unused
inline
uvec
find(const mtOpCube<uword, T1, op_rel_type>& X, const uword k = 0, const char* direction = "first")
  {
  arma_debug_sigprint();
  
  typedef typename T1::elem_type eT;
  
  const unwrap_cube<T1> tmp(X.m);
  
  const Mat<eT> R( const_cast< eT* >(tmp.M.memptr()), tmp.M.n_elem, 1, false );
  
  return find( mtOp<uword, Mat<eT>, op_rel_type>(R, X.aux), k, direction );
  }



template<typename T1, typename T2, typename glue_rel_type>
arma_warn_unused
inline
uvec
find(const mtGlueCube<uword, T1, T2, glue_rel_type>& X, const uword k = 0, const char* direction = "first")
  {
  arma_debug_sigprint();
  
  typedef typename T1::elem_type eT1;
  typedef typename T2::elem_type eT2;
  
  const unwrap_cube<T1> tmp1(X.A);
  const unwrap_cube<T2> tmp2(X.B);
  
  arma_conform_assert_same_size( tmp1.M, tmp2.M, "relational operator" );
  
  const Mat<eT1> R1( const_cast< eT1* >(tmp1.M.memptr()), tmp1.M.n_elem, 1, false );
  const Mat<eT2> R2( const_cast< eT2* >(tmp2.M.memptr()), tmp2.M.n_elem, 1, false );
  
  return find( mtGlue<uword, Mat<eT1>, Mat<eT2>, glue_rel_type>(R1, R2), k, direction );
  }



//



template<typename T1>
arma_warn_unused
inline
Col<uword>
find(const SpBase<typename T1::elem_type,T1>& X, const uword k = 0)
  {
  arma_debug_sigprint();
  
  const SpProxy<T1> P(X.get_ref());
  
  const uword n_rows = P.get_n_rows();
  const uword n_nz   = P.get_n_nonzero();
  
  Mat<uword> tmp(n_nz, 1, arma_nozeros_indicator());
  
  uword* tmp_mem = tmp.memptr();
  
  typename SpProxy<T1>::const_iterator_type it = P.begin();
  
  for(uword i=0; i<n_nz; ++i)
    {
    const uword index = it.row() + it.col()*n_rows;
    
    tmp_mem[i] = index;
    
    ++it;
    }
  
  Col<uword> out;
  
  const uword count = (k == 0) ? uword(n_nz) : uword( (std::min)(n_nz, k) );
  
  out.steal_mem_col(tmp, count);
  
  return out;
  }



template<typename T1>
arma_warn_unused
inline
Col<uword>
find(const SpBase<typename T1::elem_type,T1>& X, const uword k, const char* direction)
  {
  arma_debug_sigprint();
  
  arma_ignore(X);
  arma_ignore(k);
  arma_ignore(direction);
  
  arma_check(true, "find(SpBase,k,direction): not implemented yet");  // TODO
  
  Col<uword> out;
  
  return out;
  }



//



template<typename T1>
arma_warn_unused
inline
typename
enable_if2
  <
  is_arma_type<T1>::value,
  const mtOp<uword, T1, op_find_finite>
  >::result
find_finite(const T1& X)
  {
  arma_debug_sigprint();
  
  return mtOp<uword, T1, op_find_finite>(X);
  }



template<typename T1>
arma_warn_unused
inline
typename
enable_if2
  <
  is_arma_type<T1>::value,
  const mtOp<uword, T1, op_find_nonfinite>
  >::result
find_nonfinite(const T1& X)
  {
  arma_debug_sigprint();
  
  return mtOp<uword, T1, op_find_nonfinite>(X);
  }



template<typename T1>
arma_warn_unused
inline
typename
enable_if2
  <
  is_arma_type<T1>::value,
  const mtOp<uword, T1, op_find_nan>
  >::result
find_nan(const T1& X)
  {
  arma_debug_sigprint();
  
  return mtOp<uword, T1, op_find_nan>(X);
  }



//



template<typename T1>
arma_warn_unused
inline
uvec
find_finite(const BaseCube<typename T1::elem_type,T1>& X)
  {
  arma_debug_sigprint();
  
  typedef typename T1::elem_type eT;
  
  const unwrap_cube<T1> tmp(X.get_ref());
  
  const Mat<eT> R( const_cast< eT* >(tmp.M.memptr()), tmp.M.n_elem, 1, false );
  
  return find_finite(R);
  }



template<typename T1>
arma_warn_unused
inline
uvec
find_nonfinite(const BaseCube<typename T1::elem_type,T1>& X)
  {
  arma_debug_sigprint();
  
  typedef typename T1::elem_type eT;
  
  const unwrap_cube<T1> tmp(X.get_ref());
  
  const Mat<eT> R( const_cast< eT* >(tmp.M.memptr()), tmp.M.n_elem, 1, false );
  
  return find_nonfinite(R);
  }



template<typename T1>
arma_warn_unused
inline
uvec
find_nan(const BaseCube<typename T1::elem_type,T1>& X)
  {
  arma_debug_sigprint();
  
  typedef typename T1::elem_type eT;
  
  const unwrap_cube<T1> tmp(X.get_ref());
  
  const Mat<eT> R( const_cast< eT* >(tmp.M.memptr()), tmp.M.n_elem, 1, false );
  
  return find_nan(R);
  }



//



template<typename T1>
arma_warn_unused
inline
Col<uword>
find_finite(const SpBase<typename T1::elem_type,T1>& X)
  {
  arma_debug_sigprint();
  
  const SpProxy<T1> P(X.get_ref());
  
  const uword n_rows = P.get_n_rows();
  const uword n_nz   = P.get_n_nonzero();
  
  Mat<uword> tmp(n_nz, 1, arma_nozeros_indicator());
  
  uword* tmp_mem = tmp.memptr();
  
  typename SpProxy<T1>::const_iterator_type it = P.begin();
  
  uword count = 0;
  
  for(uword i=0; i<n_nz; ++i)
    {
    if(arma_isfinite(*it))
      {
      const uword index = it.row() + it.col()*n_rows;
      
      tmp_mem[count] = index;
      
      ++count;
      }
    
    ++it;
    }
  
  Col<uword> out;
  
  if(count > 0)  { out.steal_mem_col(tmp, count); }
  
  return out;
  }



template<typename T1>
arma_warn_unused
inline
Col<uword>
find_nonfinite(const SpBase<typename T1::elem_type,T1>& X)
  {
  arma_debug_sigprint();
  
  const SpProxy<T1> P(X.get_ref());
  
  const uword n_rows = P.get_n_rows();
  const uword n_nz   = P.get_n_nonzero();
  
  Mat<uword> tmp(n_nz, 1, arma_nozeros_indicator());
  
  uword* tmp_mem = tmp.memptr();
  
  typename SpProxy<T1>::const_iterator_type it = P.begin();
  
  uword count = 0;
  
  for(uword i=0; i<n_nz; ++i)
    {
    if(arma_isfinite(*it) == false)
      {
      const uword index = it.row() + it.col()*n_rows;
      
      tmp_mem[count] = index;
      
      ++count;
      }
    
    ++it;
    }
  
  Col<uword> out;
  
  if(count > 0)  { out.steal_mem_col(tmp, count); }
  
  return out;
  }



template<typename T1>
arma_warn_unused
inline
Col<uword>
find_nan(const SpBase<typename T1::elem_type,T1>& X)
  {
  arma_debug_sigprint();
  
  const SpProxy<T1> P(X.get_ref());
  
  const uword n_rows = P.get_n_rows();
  const uword n_nz   = P.get_n_nonzero();
  
  Mat<uword> tmp(n_nz, 1, arma_nozeros_indicator());
  
  uword* tmp_mem = tmp.memptr();
  
  typename SpProxy<T1>::const_iterator_type it = P.begin();
  
  uword count = 0;
  
  for(uword i=0; i<n_nz; ++i)
    {
    if(arma_isnan(*it))
      {
      const uword index = it.row() + it.col()*n_rows;
      
      tmp_mem[count] = index;
      
      ++count;
      }
    
    ++it;
    }
  
  Col<uword> out;
  
  if(count > 0)  { out.steal_mem_col(tmp, count); }
  
  return out;
  }



//! @}
