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#ifndef COSMOINTERFACE_COMPLEXFIELDALGEBRA_COMPLEXFIELDSUBTRACT_H
#define COSMOINTERFACE_COMPLEXFIELDALGEBRA_COMPLEXFIELDSUBTRACT_H

/* This file is part of TempLat, available at https://cosmolattice.github.io/templat .
   Copyright 2021-2026 The TempLat authors, see AUTHORS.md.
   Released under the MIT license, see LICENSE.md. */

// File info: Main contributor(s): Adrien Florio, Franz R. Sattler, Year: 2025

#include "TempLat/lattice/algebra/helpers/doeval.h"
#include "TempLat/lattice/algebra/helpers/hasstaticgetter.h"
#include "real.h"
#include "imag.h"
#include "TempLat/lattice/algebra/complexalgebra/complexfieldbinaryoperator.h"
#include "TempLat/lattice/algebra/complexalgebra/complexwrapper.h"
#include "TempLat/lattice/algebra/complexalgebra/real.h"
#include "TempLat/lattice/algebra/complexalgebra/imag.h"

namespace TempLat
{
  template <class R, class T> class ComplexFieldSubtraction : public ComplexFieldBinaryOperator<R, T>
  {
  public:
    using ComplexFieldBinaryOperator<R, T>::mR;
    using ComplexFieldBinaryOperator<R, T>::mT;

    // Put public methods here. These should change very little over time.
    ComplexFieldSubtraction(const R &pR, const T &pT) : ComplexFieldBinaryOperator<R, T>(pR, pT) {}

    auto ComplexFieldGet(Tag<0> t) const { return Real(mR) - Real(mT); }
    auto ComplexFieldGet(Tag<1> t) const { return Imag(mR) - Imag(mT); }

    template <typename... IDX>
      requires requires(std::decay_t<R> r, std::decay_t<T> t, IDX... idx) {
        requires IsVariadicIndex<IDX...>;
        DoEval::eval(r, idx...);
        DoEval::eval(t, idx...);
      }
    DEVICE_INLINE_FUNCTION auto eval(const IDX &...idx) const
    {
      auto cL = DoEval::eval(mR, idx...);
      auto cR = DoEval::eval(mT, idx...);
      device::array<decltype(cL[0] - cR[0]), 2> result;
      result[0] = cL[0] - cR[0];
      result[1] = cL[1] - cR[1];
      return result;
    }

    virtual std::string operatorString() const override { return "-"; }
  };

  template <typename R, typename T>
    requires(HasComplexFieldGet<R> && HasComplexFieldGet<T>)
  auto operator-(const R &r, const T &t)
  {
    return ComplexFieldSubtraction<R, T>{r, t};
  }

  template <typename R, typename T>
    requires(!HasComplexFieldGet<R> && HasComplexFieldGet<T>)
  auto operator-(const R &r, const T &t)
  {
    return ComplexFieldSubtraction{Complexify(r, ZeroType()), t};
  }

  template <typename R, typename T>
    requires(HasComplexFieldGet<R> && !HasComplexFieldGet<T>)
  auto operator-(const R &r, const T &t)
  {
    return ComplexFieldSubtraction{r, Complexify(t, ZeroType())};
  }
} // namespace TempLat

#endif