# essim_add_frontend(<name> [LIBS <toolkit link targets>...])
#
# Builds the boilerplate shared by every frontend under src/frontends/<name>/:
#   * a static library essim_<name> from every .cpp in the current directory
#     except main.cpp, linking essim_core plus the frontend's own GUI/TUI
#     toolkit (LIBS);
#   * the `essim` executable from main.cpp, linking essim_<name> and the shared,
#     toolkit-free launcher essim_frontend, emitted at the top of the build tree
#     (./build/essim) whichever frontend produced it.
#
# A per-frontend CMakeLists only sets up its toolkit (FetchContent /
# find_package, and any directory-scoped include dirs / definitions) and then
# calls this with the toolkit's link targets — no target wiring repeated.
function(essim_add_frontend name)
  cmake_parse_arguments(FE "" "" "LIBS" ${ARGN})

  set(dir "${CMAKE_CURRENT_SOURCE_DIR}")

  # Frontend library = every .cpp here except the entry point.
  file(GLOB FE_SOURCES "${dir}/*.cpp")
  list(REMOVE_ITEM FE_SOURCES "${dir}/main.cpp")

  add_library(essim_${name} STATIC ${FE_SOURCES})
  target_link_libraries(essim_${name} PUBLIC essim_core ${FE_LIBS})

  add_executable(essim "${dir}/main.cpp")
  target_link_libraries(essim PRIVATE essim_${name} essim_frontend)
  set_target_properties(essim PROPERTIES
    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}")
endfunction()