cmake_minimum_required(VERSION 3.18)
project(pyngspice VERSION 43.0.0 LANGUAGES C CXX)

# ============================================================================
# Options
# ============================================================================
option(BUILD_PYTHON_BINDINGS "Build Python bindings" ON)
option(ENABLE_XSPICE "Enable XSPICE code models" ON)
option(ENABLE_OSDI "Enable OSDI (Verilog-A) support" ON)
option(ENABLE_CIDER "Enable CIDER numerical device models" OFF)  # Disabled - needs special KLU setup
option(ENABLE_KLU "Enable KLU sparse matrix solver" OFF)  # Disabled - needs complex build setup

# ============================================================================
# Compiler settings
# ============================================================================
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_C_STANDARD 11)
set(CMAKE_C_EXTENSIONS ON)  # Use gnu11 instead of c11 for better complex support
set(CMAKE_POSITION_INDEPENDENT_CODE ON)

# Suppress warnings
if(MSVC)
    add_compile_options(/W3 /wd4996 /wd4267 /wd4244 /wd4018 /wd4090 /wd4101 /wd4146)
    add_definitions(-D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_WARNINGS)
    add_definitions(-DWIN32 -D_WINDOWS)
else()
    add_compile_options(-Wall -Wno-unused-variable -Wno-unused-function -Wno-sign-compare -Wno-format)
    if(CMAKE_C_COMPILER_ID MATCHES "GNU")
        add_compile_options(-Wno-maybe-uninitialized -Wno-unused-but-set-variable)
    endif()
endif()

# ============================================================================
# Platform detection
# ============================================================================
if(WIN32)
    set(PLATFORM_WINDOWS TRUE)
elseif(APPLE)
    set(PLATFORM_MACOS TRUE)
elseif(UNIX)
    set(PLATFORM_LINUX TRUE)
endif()

# ============================================================================
# Find dependencies
# ============================================================================
find_package(Python3 REQUIRED COMPONENTS Interpreter Development.Module NumPy)

# Find pybind11 — try system install first, then fall back to pip-installed
find_package(pybind11 CONFIG QUIET)
if(NOT pybind11_FOUND)
    # pybind11 is a build dependency in pyproject.toml, so pip has already
    # installed it into the build environment. Find it via the Python package.
    execute_process(
        COMMAND ${Python3_EXECUTABLE} -c
            "import pybind11; print(pybind11.get_cmake_dir())"
        OUTPUT_VARIABLE PYBIND11_CMAKE_DIR
        OUTPUT_STRIP_TRAILING_WHITESPACE
        RESULT_VARIABLE PYBIND11_RESULT
    )
    if(PYBIND11_RESULT EQUAL 0)
        list(APPEND CMAKE_PREFIX_PATH ${PYBIND11_CMAKE_DIR})
        find_package(pybind11 CONFIG REQUIRED)
    else()
        message(FATAL_ERROR
            "pybind11 not found. Install it with: pip install pybind11>=2.11")
    endif()
endif()

# Math library on Unix
if(UNIX AND NOT APPLE)
    find_library(M_LIBRARY m REQUIRED)
endif()

find_package(Threads REQUIRED)

# ============================================================================
# Source directories
# ============================================================================
set(NGSPICE_SRC ${CMAKE_CURRENT_SOURCE_DIR}/src)

# ============================================================================
# Include directories
# ============================================================================
set(NGSPICE_INCLUDE_DIRS
    ${CMAKE_CURRENT_SOURCE_DIR}/visualc/src/include  # Windows config.h
    ${NGSPICE_SRC}
    ${NGSPICE_SRC}/include
    ${NGSPICE_SRC}/include/cppduals  # For HICUM2 duals library
    ${NGSPICE_SRC}/include/ngspice
    ${NGSPICE_SRC}/spicelib/devices
    ${NGSPICE_SRC}/spicelib/analysis
    ${NGSPICE_SRC}/spicelib/parser
    ${NGSPICE_SRC}/maths/dense
    ${NGSPICE_SRC}/maths/sparse
    ${NGSPICE_SRC}/maths/ni
    ${NGSPICE_SRC}/maths/deriv
    ${NGSPICE_SRC}/maths/cmaths
    ${NGSPICE_SRC}/maths/misc
    ${NGSPICE_SRC}/maths/poly
    ${NGSPICE_SRC}/maths/fft
    ${NGSPICE_SRC}/frontend
    ${NGSPICE_SRC}/frontend/plotting
    ${NGSPICE_SRC}/frontend/parser
    ${NGSPICE_SRC}/frontend/help
    ${NGSPICE_SRC}/frontend/numparam
    ${NGSPICE_SRC}/frontend/trannoise
    ${NGSPICE_SRC}/misc
    ${NGSPICE_SRC}/ciderlib/input
    ${NGSPICE_SRC}/ciderlib/support
    ${NGSPICE_SRC}/ciderlib/oned
    ${NGSPICE_SRC}/ciderlib/twod
    ${NGSPICE_SRC}/xspice/cm
    ${NGSPICE_SRC}/xspice/cmpp
    ${NGSPICE_SRC}/xspice/evt
    ${NGSPICE_SRC}/xspice/enh
    ${NGSPICE_SRC}/xspice/ipc
    ${NGSPICE_SRC}/xspice/idn
    ${NGSPICE_SRC}/xspice/mif
    ${NGSPICE_SRC}/xspice/icm
    ${NGSPICE_SRC}/osdi
)

# ============================================================================
# Build date/version info
# ============================================================================
string(TIMESTAMP NGSPICE_BUILD_DATE "%Y-%m-%d")

# ============================================================================
# Compile definitions
# ============================================================================
set(NGSPICE_DEFINITIONS
    -DNGSPICEDLL
    -DSHARED_MODULE
    -DSIMULATOR
    -DHAS_PROGREP
    -DNG_SHARED_BUILD
    -DNGSPICEBUILDDATE="${NGSPICE_BUILD_DATE}"
)

# MinGW-specific: nothing special needed now since we patched cmath1.c

if(ENABLE_XSPICE)
    list(APPEND NGSPICE_DEFINITIONS -DXSPICE)
endif()

if(ENABLE_OSDI)
    list(APPEND NGSPICE_DEFINITIONS -DOSDI)
endif()

if(ENABLE_CIDER)
    list(APPEND NGSPICE_DEFINITIONS -DCIDER)
endif()

if(ENABLE_KLU)
    list(APPEND NGSPICE_DEFINITIONS -DKLU)
endif()

# ============================================================================
# Collect ngspice source files
# ============================================================================

# Frontend sources
file(GLOB FRONTEND_SOURCES
    ${NGSPICE_SRC}/frontend/*.c
)

# Frontend subdirectories
file(GLOB FRONTEND_PARSER_SOURCES ${NGSPICE_SRC}/frontend/parser/*.c)
file(GLOB FRONTEND_NUMPARAM_SOURCES ${NGSPICE_SRC}/frontend/numparam/*.c)
file(GLOB FRONTEND_TRANNOISE_SOURCES ${NGSPICE_SRC}/frontend/trannoise/*.c)
file(GLOB FRONTEND_HELP_SOURCES ${NGSPICE_SRC}/frontend/help/*.c)
file(GLOB FRONTEND_PLOTTING_SOURCES ${NGSPICE_SRC}/frontend/plotting/*.c)

# Math sources
file(GLOB MATHS_SPARSE_SOURCES ${NGSPICE_SRC}/maths/sparse/*.c)
file(GLOB MATHS_DENSE_SOURCES ${NGSPICE_SRC}/maths/dense/*.c)
file(GLOB MATHS_NI_SOURCES ${NGSPICE_SRC}/maths/ni/*.c)
file(GLOB MATHS_DERIV_SOURCES ${NGSPICE_SRC}/maths/deriv/*.c)
file(GLOB MATHS_CMATHS_SOURCES ${NGSPICE_SRC}/maths/cmaths/*.c)
file(GLOB MATHS_MISC_SOURCES ${NGSPICE_SRC}/maths/misc/*.c)
file(GLOB MATHS_POLY_SOURCES ${NGSPICE_SRC}/maths/poly/*.c)
file(GLOB MATHS_FFT_SOURCES ${NGSPICE_SRC}/maths/fft/*.c)

# Spicelib sources
file(GLOB SPICELIB_ANALYSIS_SOURCES ${NGSPICE_SRC}/spicelib/analysis/*.c)
file(GLOB SPICELIB_PARSER_SOURCES ${NGSPICE_SRC}/spicelib/parser/*.c)

# Device sources - collect all device model subdirectories
file(GLOB_RECURSE SPICELIB_DEVICES_C_SOURCES ${NGSPICE_SRC}/spicelib/devices/*.c)
# HICUM2 .cpp files use the "duals" library for automatic differentiation (header-only, included in ngspice)
file(GLOB_RECURSE SPICELIB_DEVICES_CPP_SOURCES ${NGSPICE_SRC}/spicelib/devices/*.cpp)
set(SPICELIB_DEVICES_SOURCES ${SPICELIB_DEVICES_C_SOURCES} ${SPICELIB_DEVICES_CPP_SOURCES})
# Exclude KLU-specific binding files when KLU is disabled
if(NOT ENABLE_KLU)
    list(FILTER SPICELIB_DEVICES_SOURCES EXCLUDE REGEX "bindCSC\\.c$")
endif()

# Misc sources
file(GLOB MISC_SOURCES ${NGSPICE_SRC}/misc/*.c)

# CIDER sources (if enabled)
if(ENABLE_CIDER)
    file(GLOB CIDER_INPUT_SOURCES ${NGSPICE_SRC}/ciderlib/input/*.c)
    file(GLOB CIDER_SUPPORT_SOURCES ${NGSPICE_SRC}/ciderlib/support/*.c)
    file(GLOB CIDER_ONED_SOURCES ${NGSPICE_SRC}/ciderlib/oned/*.c)
    file(GLOB CIDER_TWOD_SOURCES ${NGSPICE_SRC}/ciderlib/twod/*.c)
    set(CIDER_SOURCES
        ${CIDER_INPUT_SOURCES}
        ${CIDER_SUPPORT_SOURCES}
        ${CIDER_ONED_SOURCES}
        ${CIDER_TWOD_SOURCES}
    )
endif()

# XSPICE sources (if enabled)
if(ENABLE_XSPICE)
    file(GLOB XSPICE_CM_SOURCES ${NGSPICE_SRC}/xspice/cm/*.c)
    file(GLOB XSPICE_EVT_SOURCES ${NGSPICE_SRC}/xspice/evt/*.c)
    file(GLOB XSPICE_ENH_SOURCES ${NGSPICE_SRC}/xspice/enh/*.c)
    file(GLOB XSPICE_IPC_SOURCES ${NGSPICE_SRC}/xspice/ipc/*.c)
    file(GLOB XSPICE_IDN_SOURCES ${NGSPICE_SRC}/xspice/idn/*.c)
    file(GLOB XSPICE_MIF_SOURCES ${NGSPICE_SRC}/xspice/mif/*.c)
    # ICM (code models) built separately
    set(XSPICE_SOURCES
        ${XSPICE_CM_SOURCES}
        ${XSPICE_EVT_SOURCES}
        ${XSPICE_ENH_SOURCES}
        ${XSPICE_IPC_SOURCES}
        ${XSPICE_IDN_SOURCES}
        ${XSPICE_MIF_SOURCES}
    )
    # Exclude KLU-specific binding files when KLU is disabled
    if(NOT ENABLE_KLU)
        list(FILTER XSPICE_SOURCES EXCLUDE REGEX "bindCSC\\.c$")
    endif()
endif()

# OSDI sources (if enabled)
if(ENABLE_OSDI)
    file(GLOB OSDI_SOURCES ${NGSPICE_SRC}/osdi/*.c)
endif()

# KLU sources (if enabled)
if(ENABLE_KLU)
    # KLU sources are in src/maths/KLU directory
    file(GLOB KLU_SOURCES ${NGSPICE_SRC}/maths/KLU/*.c)
    list(APPEND NGSPICE_INCLUDE_DIRS ${NGSPICE_SRC}/maths/KLU)
endif()

# Main ngspice files
set(NGSPICE_MAIN_SOURCES
    ${NGSPICE_SRC}/sharedspice.c
    ${NGSPICE_SRC}/conf.c
    ${NGSPICE_SRC}/ngspice.c  # Contains SIMinfo definition
)

# MSVC compatibility
if(MSVC AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/visualc/src/msvc-compat.c)
    list(APPEND NGSPICE_MAIN_SOURCES
        ${CMAKE_CURRENT_SOURCE_DIR}/visualc/src/msvc-compat.c
    )
endif()

# ============================================================================
# Combine all ngspice sources
# ============================================================================
set(ALL_NGSPICE_SOURCES
    ${NGSPICE_MAIN_SOURCES}
    ${FRONTEND_SOURCES}
    ${FRONTEND_PARSER_SOURCES}
    ${FRONTEND_NUMPARAM_SOURCES}
    ${FRONTEND_TRANNOISE_SOURCES}
    ${FRONTEND_HELP_SOURCES}
    ${FRONTEND_PLOTTING_SOURCES}
    ${MATHS_SPARSE_SOURCES}
    ${MATHS_DENSE_SOURCES}
    ${MATHS_NI_SOURCES}
    ${MATHS_DERIV_SOURCES}
    ${MATHS_CMATHS_SOURCES}
    ${MATHS_MISC_SOURCES}
    ${MATHS_POLY_SOURCES}
    ${MATHS_FFT_SOURCES}
    ${SPICELIB_ANALYSIS_SOURCES}
    ${SPICELIB_PARSER_SOURCES}
    ${SPICELIB_DEVICES_SOURCES}
    ${MISC_SOURCES}
)

if(ENABLE_CIDER)
    list(APPEND ALL_NGSPICE_SOURCES ${CIDER_SOURCES})
endif()

if(ENABLE_XSPICE)
    list(APPEND ALL_NGSPICE_SOURCES ${XSPICE_SOURCES})
endif()

if(ENABLE_OSDI)
    list(APPEND ALL_NGSPICE_SOURCES ${OSDI_SOURCES})
endif()

if(ENABLE_KLU AND DEFINED KLU_SOURCES)
    list(APPEND ALL_NGSPICE_SOURCES ${KLU_SOURCES})
endif()

# Remove files that cause conflicts or aren't needed for shared library
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "main\\.c$")
# Note: ngspice.c is INCLUDED - it contains SIMinfo but no main()
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "winmain\\.c$")
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "tclspice\\.c$")
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "ngnutmeg\\.c$")
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "nghelp\\.c$")
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "ngsconvert\\.c$")
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "ngmultidec\\.c$")
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "ngproc2mod\\.c$")
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "makeidx\\.c$")
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "hist_info\\.c$")
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "testcommands\\.c$")
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "test_accuracy\\.c$")
# Exclude ndev (network device) - uses Unix socket headers
list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "/ndev/")
# Exclude CIDER-dependent numerical device models when CIDER is disabled
if(NOT ENABLE_CIDER)
    list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "/nbjt/")
    list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "/nbjt2/")
    list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "/numd/")
    list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "/numd2/")
    list(FILTER ALL_NGSPICE_SOURCES EXCLUDE REGEX "/numos/")
endif()

# ============================================================================
# Create ngspice static library
# ============================================================================
add_library(ngspice_core STATIC ${ALL_NGSPICE_SOURCES})

target_include_directories(ngspice_core PUBLIC ${NGSPICE_INCLUDE_DIRS})
target_compile_definitions(ngspice_core PUBLIC ${NGSPICE_DEFINITIONS})

if(UNIX AND NOT APPLE)
    target_link_libraries(ngspice_core PUBLIC ${M_LIBRARY})
endif()

target_link_libraries(ngspice_core PUBLIC Threads::Threads)

# Windows-specific libraries
if(WIN32)
    target_link_libraries(ngspice_core PUBLIC shlwapi)
endif()

# ============================================================================
# Python extension sources
# ============================================================================
set(PYTHON_EXT_SOURCES
    ${NGSPICE_SRC}/bindings/module.cpp
    ${NGSPICE_SRC}/cpp/simulator.cpp
    ${NGSPICE_SRC}/cpp/callbacks.cpp
    ${NGSPICE_SRC}/cpp/sim_runner.cpp
    ${NGSPICE_SRC}/cpp/raw_read.cpp
    ${NGSPICE_SRC}/cpp/trace.cpp
)

# ============================================================================
# Create Python module
# ============================================================================
pybind11_add_module(_pyngspice MODULE ${PYTHON_EXT_SOURCES})

target_include_directories(_pyngspice PRIVATE
    ${NGSPICE_INCLUDE_DIRS}
    ${NGSPICE_SRC}/cpp
    ${Python3_INCLUDE_DIRS}
    ${Python3_NumPy_INCLUDE_DIRS}
)

target_compile_definitions(_pyngspice PRIVATE
    NGSPICE_PYTHON_MODULE
    VERSION_STR="${PROJECT_VERSION}"
    ${NGSPICE_DEFINITIONS}
)

# Link against ngspice core and Python
target_link_libraries(_pyngspice PRIVATE
    ngspice_core
    Python3::NumPy
)

if(APPLE)
    target_link_libraries(_pyngspice PRIVATE "-framework Accelerate")
endif()

# Output .pyd directly into pyngspice/ for inplace editable install
set_target_properties(_pyngspice PROPERTIES
    LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/pyngspice
)

# MinGW: statically link all runtime DLLs (ship zero DLLs)
if(MINGW)
    target_link_options(_pyngspice PRIVATE -static-libgcc -static-libstdc++)
    target_link_libraries(_pyngspice PRIVATE
        -Wl,-Bstatic,--whole-archive -lwinpthread -Wl,--no-whole-archive,-Bdynamic
    )
endif()

# ============================================================================
# Install (for wheel builds)
# ============================================================================
install(TARGETS _pyngspice
    LIBRARY DESTINATION pyngspice
    RUNTIME DESTINATION pyngspice
)

install(FILES
    ${CMAKE_CURRENT_SOURCE_DIR}/pyngspice/__init__.py
    ${CMAKE_CURRENT_SOURCE_DIR}/pyngspice/runner.py
    ${CMAKE_CURRENT_SOURCE_DIR}/pyngspice/netlist.py
    DESTINATION pyngspice
)

# ============================================================================
# Summary
# ============================================================================
message(STATUS "")
message(STATUS "========================================")
message(STATUS "pyngspice Configuration")
message(STATUS "========================================")
message(STATUS "  Version:       ${PROJECT_VERSION}")
message(STATUS "  Python:        ${Python3_EXECUTABLE}")
message(STATUS "  NumPy:         ${Python3_NumPy_VERSION}")
message(STATUS "  pybind11:      ${pybind11_VERSION}")
message(STATUS "  XSPICE:        ${ENABLE_XSPICE}")
message(STATUS "  OSDI:          ${ENABLE_OSDI}")
message(STATUS "  CIDER:         ${ENABLE_CIDER}")
message(STATUS "  KLU:           ${ENABLE_KLU}")
message(STATUS "  Source files:  ${CMAKE_CURRENT_LIST_DIR}")
message(STATUS "========================================")
message(STATUS "")