%global pypi_name emerge

Name:           python-%{pypi_name}
# Hertzon pins emerge==2.8.9 exactly; move the two together.
Version:        2.8.9
Release:        1%{?dist}
Summary:        Open-source 3D full-wave electromagnetic FEM simulator in Python

# LICENSE: GPL v2 or later with the original Gmsh additional permission (the
# source headers say "or (at your option) any later version").
License:        GPL-2.0-or-later WITH Gmsh-exception
URL:            https://github.com/FennisRobert/EMerge
Source0:        %{pypi_source %{pypi_name}}

BuildArch:      noarch
BuildRequires:  python3-devel
BuildRequires:  pyproject-rpm-macros

%global _description %{expand:
EMerge is a frequency-domain finite-element solver for 3D electromagnetics:
geometry and meshing through gmsh/OpenCASCADE, 2nd-order Nedelec elements,
wave, lumped, Floquet and user-defined ports, PEC/PMC, impedance, absorbing
and periodic boundaries, S-parameter sweeps, eigenmodes, near and far fields
and PyVista field display. The element kernels are compiled with numba on
first use. It is the solver underneath the Hertzon GUI.}

%description %_description

%package -n python3-%{pypi_name}
Summary:        %{summary}
# Faster direct solve when present; EMerge falls back to SciPy SuperLU.
Recommends:     python3dist(scikit-umfpack)
# DXF import/export (emerge.beta.dxf)
Suggests:       python3dist(ezdxf)
%description -n python3-%{pypi_name} %_description

%prep
%autosetup -n %{pypi_name}-%{version}
# Upstream caps are release pins, not known breakage. Fedora 44 has
# Python 3.14, gmsh 4.15 and numpy 2.4; Fedora 45 numpy 2.5.
# mkl (x86_64 only, proprietary) is optional: EMerge uses PARDISO only when
# it can load it.
sed -i \
    -e 's/requires-python = ">=3.10, <3.14"/requires-python = ">=3.10"/' \
    -e 's/"gmsh>=4.13.0, <4.15"/"gmsh>=4.13.0"/' \
    -e 's/"numpy>=2.2, <2.5"/"numpy>=2.2"/' \
    -e '/"mkl!=2024.0;/d' \
    pyproject.toml

%generate_buildrequires
%pyproject_buildrequires

%build
%pyproject_wheel

%install
%pyproject_install
%pyproject_save_files %{pypi_name} emerge_config

%check
# The optional extras: beta.gerber needs pygerber (not packaged), beta.dxf
# needs ezdxf. The cuDSS/PARDISO/UMFPACK solve interfaces import lazily.
%pyproject_check_import -e 'emerge.beta.gerber' -e 'emerge.beta._gerber*' -e 'emerge.beta.dxf' -e 'emerge._emerge.geo.pcb_tools.dxf'
# A parallel-plate (TEM) line, 50 mm long at 10 GHz, PEC top and bottom and
# PMC sides, between two user-defined ports: it must pass almost everything
# with the phase of free space.
mkdir -p %{_builddir}/emerge-check && cd %{_builddir}/emerge-check
export NUMBA_CACHE_DIR=$PWD/numba-cache MPLBACKEND=Agg
%{py3_test_envvars} %{python3} - <<'PYEOF'
import numpy as np
import emerge as em
mm = 1e-3
model = em.Simulation("ParallelPlates")
box = em.geo.Box(20 * mm, 20 * mm, 50 * mm, position=(-10 * mm, -10 * mm, 0))
model.commit_geometry()
model.mw.set_frequency(10e9)
model.generate_mesh()
Ey = lambda k0, x, y, z: np.ones_like(x)
model.mw.bc.UserDefinedPort(box.bottom, 1, Ey=Ey)
model.mw.bc.UserDefinedPort(box.top, 2, Ey=Ey)
model.mw.bc.PMC(box.left + box.right)
data = model.mw.run_sweep()
g = data.scalar.grid
s11, s21 = complex(np.ravel(g.S(1, 1))[0]), complex(np.ravel(g.S(2, 1))[0])
k0 = 2 * np.pi * 10e9 / 299792458
dphi = np.angle(s21 * np.exp(1j * k0 * 50 * mm))
print("S11 %.4f  |S21| %.4f  phase error %.2f deg" % (abs(s11), abs(s21), np.degrees(dphi)))
assert abs(s11) < 0.05 and abs(s21) > 0.99, (s11, s21)
assert abs(np.degrees(dphi)) < 3, np.degrees(dphi)
PYEOF
# A kernel compiled during the solve can still land beside its source.
find %{buildroot}%{python3_sitelib} -name '*.nb[ci]' -delete

%files -n python3-%{pypi_name} -f %{pyproject_files}
%license LICENSE THIRD_PARTY_LICENSES.md
%doc README.md
%{_bindir}/emerge

%changelog
* Wed Oct 21 2026 Morgan Hough <morgan.hough@gmail.com> - 2.8.9-1
- Initial package (the solver underneath Hertzon).