# frontend/apiserver — Go REST API server with CGO backend integration.
#
# CGO is required for two reasons:
#   1. pam_linux.go: dlopen/dlsym for PAM (handled by -ldl in the source file)
#   2. backend/clib.go: libxce C client library for IPC with the controller
#
# Include/link flags for libxce and its transitive deps are gathered from
# pkg-config and injected into CGO_CFLAGS/CGO_LDFLAGS so the go_build script
# can substitute path placeholders before invoking go build.

cgo_cflags  = ''
cgo_ldflags = ''

if with_debug
  cgo_cflags  += '-fsanitize=address -g -DWITH_DEBUG=1 '
  cgo_ldflags += '-fsanitize=address -g '
endif

# Deps whose cflags/ldflags must be passed into CGO (transitive libxce deps).
apiserver_cgo_deps = [
  librtti_dep,
  c_capnproto_dep,
  ssl_dep,
  tinylog_dep,
  math_dep,
  rt_dep,
]

foreach dep : apiserver_cgo_deps
  cf = run_command(pkgconfig, '--cflags', dep.name(), check: false)
  if cf.returncode() == 0
    cgo_cflags += ' ' + cf.stdout().strip()
  endif
  lf = run_command(pkgconfig, '--libs', dep.name(), check: false)
  if lf.returncode() == 0
    cgo_ldflags += ' ' + lf.stdout().strip()
  endif
endforeach

# Add the source and build-directory include paths with meson placeholders.
# The go_build script resolves @CURRENT_SOURCE_DIR@ and @BUILD_ROOT@ at build time.
cgo_cflags += ' -I@CURRENT_SOURCE_DIR@/../../include -I@BUILD_ROOT@/lib'
cgo_ldflags += ' -L@BUILD_ROOT@/lib -lxce'

go_env = environment()
go_env.set('CGO_CFLAGS',  cgo_cflags)
go_env.set('CGO_LDFLAGS', cgo_ldflags)
go_env.set('BUILDTYPE',   get_option('buildtype'))
go_env.set('FIX_ENVARS',  'CGO_CFLAGS CGO_LDFLAGS')
go_env.set('ENVARS',      'CURRENT_SOURCE_DIR BUILD_ROOT')
go_env.set('DEPENDENCIES','thread math')

custom_target('apiserver',
  input:   'cmd/main.go',
  output:  'xce_apiserver',
  command: [env_program,
            'CURRENT_SOURCE_DIR="@CURRENT_SOURCE_DIR@"',
            'BUILD_ROOT="@BUILD_ROOT@"',
            go_build_program,
            '@INPUT@', '@OUTPUT@'],
  env:     go_env,
  depends: [libxce],
  install: true,
  install_dir: get_option('prefix') / 'bin')