// 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_vecnorm
//! @{

template <typename T1>
arma_warn_unused inline
    typename enable_if2<is_arma_type<T1>::value && resolves_to_vector<T1>::yes,
                        typename T1::pod_type>::result
    vecnorm(const T1& X, const uword k = uword(2),
            const arma_empty_class junk1 = arma_empty_class(),
            const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk2 =
                nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk1);
  arma_ignore(junk2);

  typedef typename T1::pod_type T;

  const Proxy<T1> P(X);

  if (P.get_n_elem() == 0) {
    return T(0);
  }

  if (k == uword(1)) {
    return op_norm::vec_norm_1(P);
  }
  if (k == uword(2)) {
    return op_norm::vec_norm_2(P);
  }

  arma_conform_check((k == 0), "vecnorm(): unsupported vector norm type");

  return op_norm::vec_norm_k(P, int(k));
}

template <typename T1>
arma_warn_unused inline
    typename enable_if2<is_arma_type<T1>::value && resolves_to_vector<T1>::no,
                        const mtOp<typename T1::pod_type, T1, op_vecnorm> >::result
    vecnorm(const T1& X, const uword k = uword(2),
            const arma_empty_class junk1 = arma_empty_class(),
            const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk2 =
                nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk1);
  arma_ignore(junk2);

  const uword dim = 0;

  return mtOp<typename T1::pod_type, T1, op_vecnorm>(X, k, dim);
}

template <typename T1>
arma_warn_unused inline const mtOp<typename T1::pod_type, T1, op_vecnorm> vecnorm(
    const Base<typename T1::elem_type, T1>& X, const uword k, const uword dim,
    const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk = nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk);

  return mtOp<typename T1::pod_type, T1, op_vecnorm>(X.get_ref(), k, dim);
}

//

template <typename T1>
arma_warn_unused inline
    typename enable_if2<is_arma_type<T1>::value && resolves_to_vector<T1>::yes,
                        typename T1::pod_type>::result
    vecnorm(const T1& X, const char* method,
            const arma_empty_class junk1 = arma_empty_class(),
            const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk2 =
                nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk1);
  arma_ignore(junk2);

  typedef typename T1::pod_type T;

  const Proxy<T1> P(X);

  if (P.get_n_elem() == 0) {
    return T(0);
  }

  const char sig = (method != nullptr) ? method[0] : char(0);

  if ((sig == 'i') || (sig == 'I') || (sig == '+')) {
    return op_norm::vec_norm_max(P);
  }
  if ((sig == '-')) {
    return op_norm::vec_norm_min(P);
  }

  arma_stop_logic_error("vecnorm(): unsupported vector norm type");

  return T(0);
}

template <typename T1>
arma_warn_unused inline
    typename enable_if2<is_arma_type<T1>::value && resolves_to_vector<T1>::no,
                        const mtOp<typename T1::pod_type, T1, op_vecnorm_ext> >::result
    vecnorm(const T1& X, const char* method,
            const arma_empty_class junk1 = arma_empty_class(),
            const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk2 =
                nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk1);
  arma_ignore(junk2);

  const char sig = (method != nullptr) ? method[0] : char(0);

  uword method_id = 0;

  if ((sig == 'i') || (sig == 'I') || (sig == '+')) {
    method_id = 1;
  }
  if ((sig == '-')) {
    method_id = 2;
  }

  const uword dim = 0;

  return mtOp<typename T1::pod_type, T1, op_vecnorm_ext>(X, method_id, dim);
}

template <typename T1>
arma_warn_unused inline const mtOp<typename T1::pod_type, T1, op_vecnorm_ext> vecnorm(
    const Base<typename T1::elem_type, T1>& X, const char* method, const uword dim,
    const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk = nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk);

  const char sig = (method != nullptr) ? method[0] : char(0);

  uword method_id = 0;

  if ((sig == 'i') || (sig == 'I') || (sig == '+')) {
    method_id = 1;
  }
  if ((sig == '-')) {
    method_id = 2;
  }

  return mtOp<typename T1::pod_type, T1, op_vecnorm_ext>(X.get_ref(), method_id, dim);
}

//
// norms for sparse matrices

template <typename T1>
arma_warn_unused inline typename enable_if2<is_arma_sparse_type<T1>::value &&
                                                resolves_to_sparse_vector<T1>::yes,
                                            typename T1::pod_type>::result
vecnorm(const T1& X, const uword k = uword(2),
        const arma_empty_class junk1 = arma_empty_class(),
        const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk2 =
            nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk1);
  arma_ignore(junk2);

  return arma::norm(X, k);
}

template <typename T1>
arma_warn_unused inline typename enable_if2<
    is_arma_sparse_type<T1>::value && resolves_to_sparse_vector<T1>::no,
    const mtSpReduceOp<typename T1::pod_type, T1, op_sp_vecnorm> >::result
vecnorm(const T1& X, const uword k = uword(2),
        const arma_empty_class junk1 = arma_empty_class(),
        const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk2 =
            nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk1);
  arma_ignore(junk2);

  const uword dim = 0;

  return mtSpReduceOp<typename T1::pod_type, T1, op_sp_vecnorm>(X, k, dim);
}

template <typename T1>
arma_warn_unused inline const mtSpReduceOp<typename T1::pod_type, T1, op_sp_vecnorm>
vecnorm(
    const SpBase<typename T1::elem_type, T1>& X, const uword k, const uword dim,
    const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk = nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk);

  return mtSpReduceOp<typename T1::pod_type, T1, op_sp_vecnorm>(X.get_ref(), k, dim);
}

//

template <typename T1>
arma_warn_unused inline typename enable_if2<is_arma_sparse_type<T1>::value &&
                                                resolves_to_sparse_vector<T1>::yes,
                                            typename T1::pod_type>::result
vecnorm(const T1& X, const char* method,
        const arma_empty_class junk1 = arma_empty_class(),
        const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk2 =
            nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk1);
  arma_ignore(junk2);

  return arma::norm(X, method);
}

template <typename T1>
arma_warn_unused inline typename enable_if2<
    is_arma_sparse_type<T1>::value && resolves_to_sparse_vector<T1>::no,
    const mtSpReduceOp<typename T1::pod_type, T1, op_sp_vecnorm_ext> >::result
vecnorm(const T1& X, const char* method,
        const arma_empty_class junk1 = arma_empty_class(),
        const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk2 =
            nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk1);
  arma_ignore(junk2);

  const char sig = (method != nullptr) ? method[0] : char(0);

  uword method_id = 0;

  if ((sig == 'i') || (sig == 'I') || (sig == '+')) {
    method_id = 1;
  }
  if ((sig == '-')) {
    method_id = 2;
  }

  const uword dim = 0;

  return mtSpReduceOp<typename T1::pod_type, T1, op_sp_vecnorm_ext>(X, method_id, dim);
}

template <typename T1>
arma_warn_unused inline const mtSpReduceOp<typename T1::pod_type, T1, op_sp_vecnorm_ext>
vecnorm(
    const SpBase<typename T1::elem_type, T1>& X, const char* method, const uword dim,
    const typename arma_real_or_cx_only<typename T1::elem_type>::result* junk = nullptr) {
  arma_debug_sigprint();
  arma_ignore(junk);

  const char sig = (method != nullptr) ? method[0] : char(0);

  uword method_id = 0;

  if ((sig == 'i') || (sig == 'I') || (sig == '+')) {
    method_id = 1;
  }
  if ((sig == '-')) {
    method_id = 2;
  }

  return mtSpReduceOp<typename T1::pod_type, T1, op_sp_vecnorm_ext>(X.get_ref(),
                                                                    method_id, dim);
}

//! @}
