cmake_minimum_required(VERSION 3.16)
project(ViewDesignEngine VERSION 1.0.0 LANGUAGES C CXX)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# ── 生成构建时间戳 ──────────────────────────────────
string(TIMESTAMP VDE_BUILD_TIMESTAMP "%Y-%m-%dT%H:%M:%SZ" UTC)
configure_file(
    ${CMAKE_CURRENT_SOURCE_DIR}/cmake/vde_build_config.h.in
    ${CMAKE_BINARY_DIR}/generated/vde_build_config.h
    @ONLY
)

option(BUILD_TESTS "Build tests" ON)
option(BUILD_BENCHMARKS "Build benchmarks" OFF)
option(BUILD_EXAMPLES "Build examples" ON)
option(ENABLE_SANITIZERS "Enable ASan" OFF)
option(VDE_USE_GMP "GMP exact arithmetic" OFF)
option(VDE_BUILD_PYTHON "Python bindings" OFF)
option(VDE_USE_OPENMP "Enable OpenMP" ON)

# ── 模块构建开关 ────────────────────────────────────
option(VDE_BUILD_CURVES    "Build curves module"    ON)
option(VDE_BUILD_MESH      "Build mesh module"      ON)
option(VDE_BUILD_BREP      "Build brep module"      ON)
option(VDE_BUILD_SPATIAL   "Build spatial module"   ON)
option(VDE_BUILD_BOOLEAN   "Build boolean module"   ON)
option(VDE_BUILD_COLLISION "Build collision module" ON)
option(VDE_BUILD_SKETCH    "Build sketch module"    ON)
option(VDE_BUILD_SDF       "Build sdf module"       ON)
option(VDE_BUILD_CAPI      "Build C API module"     ON)

add_library(vde_compile_options INTERFACE)
include(cmake/CompilerSettings.cmake)
target_compile_features(vde_compile_options INTERFACE cxx_std_20)

find_package(Eigen3 3.3 QUIET)
if(NOT Eigen3_FOUND)
    include(FetchContent)
    FetchContent_Declare(Eigen3
        URL https://gitlab.com/libeigen/eigen/-/archive/3.4.0/eigen-3.4.0.tar.gz)
    FetchContent_MakeAvailable(Eigen3)
endif()

add_subdirectory(src)

if(BUILD_BENCHMARKS)
    add_subdirectory(bench)
endif()

if(BUILD_TESTS)
    enable_testing()
    find_package(GTest QUIET)
    if(NOT GTest_FOUND)
        include(FetchContent)
        FetchContent_Declare(googletest
            URL https://github.com/google/googletest/archive/refs/tags/v1.14.0.tar.gz)
        set(INSTALL_GTEST OFF CACHE BOOL "" FORCE)
        FetchContent_MakeAvailable(googletest)
    endif()
    add_subdirectory(tests)
endif()

if(BUILD_EXAMPLES)
    add_subdirectory(examples)
endif()

if(VDE_BUILD_PYTHON)
    add_subdirectory(python)
endif()