# SPDX-License-Identifier: Apache-2.0
#
# Copyright (C) 2023 The Falco Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.
#

set(FALCOSECURITY_LIBS_CMAKE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules/falcosecurity-libs-repo")
set(FALCOSECURITY_LIBS_CMAKE_WORKING_DIR "${CMAKE_BINARY_DIR}/falcosecurity-libs-repo")

file(MAKE_DIRECTORY ${FALCOSECURITY_LIBS_CMAKE_WORKING_DIR})

# explicitly disable the bundled driver, since we pull it separately
set(USE_BUNDLED_DRIVER OFF CACHE BOOL "")

if(FALCOSECURITY_LIBS_SOURCE_DIR)
  set(FALCOSECURITY_LIBS_VERSION "0.0.0-local")
  message(STATUS "Using local version of falcosecurity/libs: '${FALCOSECURITY_LIBS_SOURCE_DIR}'")
else()
  # FALCOSECURITY_LIBS_REPO accepts a repository name (<org name>/<repo name>) alternative to the falcosecurity/libs repository.
  # In case you want to test against a fork of falcosecurity/libs just pass the variable -
  # ie., `cmake -DFALCOSECURITY_LIBS_REPO=<your-gh-handle>/libs ..`
  if (NOT FALCOSECURITY_LIBS_REPO)
    set(FALCOSECURITY_LIBS_REPO "falcosecurity/libs")
  endif()

  # FALCOSECURITY_LIBS_VERSION accepts a git reference (branch name, commit hash, or tag) to the falcosecurity/libs repository.
  # In case you want to test against another falcosecurity/libs version (or branch, or commit) just pass the variable -
  # ie., `cmake -DFALCOSECURITY_LIBS_VERSION=dev ..`
  if(NOT FALCOSECURITY_LIBS_VERSION)
    set(FALCOSECURITY_LIBS_VERSION "dd165076cb71c5640f705c2e67acb604b2d3bdc9")
#    set(FALCOSECURITY_LIBS_CHECKSUM "SHA256=aedc4120d335ee2ebf7f3c2e6346fc985ca09a49d14ff7c6249a033e47d160bf")
  endif()

  # cd /path/to/build && cmake /path/to/source
  execute_process(COMMAND "${CMAKE_COMMAND}"
      -DCMAKE_BUILD_TYPE="${CMAKE_BUILD_TYPE}"
      -DFALCOSECURITY_LIBS_REPO=${FALCOSECURITY_LIBS_REPO}
      -DFALCOSECURITY_LIBS_VERSION=${FALCOSECURITY_LIBS_VERSION}
      -DFALCOSECURITY_LIBS_CHECKSUM=${FALCOSECURITY_LIBS_CHECKSUM}
    ${FALCOSECURITY_LIBS_CMAKE_SOURCE_DIR} WORKING_DIRECTORY ${FALCOSECURITY_LIBS_CMAKE_WORKING_DIR})

  # cmake --build .
  execute_process(COMMAND "${CMAKE_COMMAND}" --build . WORKING_DIRECTORY "${FALCOSECURITY_LIBS_CMAKE_WORKING_DIR}")
  set(FALCOSECURITY_LIBS_SOURCE_DIR "${FALCOSECURITY_LIBS_CMAKE_WORKING_DIR}/falcosecurity-libs-prefix/src/falcosecurity-libs")
endif()

set(LIBS_PACKAGE_NAME "falcosecurity")

if(CMAKE_SYSTEM_NAME MATCHES "Linux")
  add_definitions(-D_GNU_SOURCE)
  add_definitions(-DHAS_CAPTURE)
endif()

if(MUSL_OPTIMIZED_BUILD)
  add_definitions(-DMUSL_OPTIMIZED)
endif()

set(SCAP_HOST_ROOT_ENV_VAR_NAME "HOST_ROOT")
set(SCAP_HOSTNAME_ENV_VAR "FALCO_HOSTNAME")
set(SINSP_AGENT_CGROUP_MEM_PATH_ENV_VAR "FALCO_CGROUP_MEM_PATH")

if(NOT LIBS_DIR)
  set(LIBS_DIR "${FALCOSECURITY_LIBS_SOURCE_DIR}")
endif()

# configure gVisor support
set(BUILD_LIBSCAP_GVISOR ${BUILD_FALCO_GVISOR} CACHE BOOL "")

# configure modern BPF support
set(BUILD_LIBSCAP_MODERN_BPF ${BUILD_FALCO_MODERN_BPF} CACHE BOOL "")

# explicitly disable the tests/examples of this dependency
set(CREATE_TEST_TARGETS OFF CACHE BOOL "")
set(BUILD_LIBSCAP_EXAMPLES OFF CACHE BOOL "")

set(USE_BUNDLED_TBB ON CACHE BOOL "")
set(USE_BUNDLED_JSONCPP ON CACHE BOOL "")
set(USE_BUNDLED_VALIJSON ON CACHE BOOL "")
set(USE_BUNDLED_RE2 ON CACHE BOOL "")
set(USE_BUNDLED_UTHASH ON CACHE BOOL "")
if(USE_DYNAMIC_LIBELF)
  set(USE_BUNDLED_LIBELF OFF CACHE BOOL "")
  set(USE_SHARED_LIBELF ON CACHE BOOL "")
endif()

list(APPEND CMAKE_MODULE_PATH "${FALCOSECURITY_LIBS_SOURCE_DIR}/cmake/modules")

include(CheckSymbolExists)
check_symbol_exists(strlcpy "string.h" HAVE_STRLCPY)

if(HAVE_STRLCPY)
  message(STATUS "Existing strlcpy and strlcat found, will *not* use local definition by setting -DHAVE_STRLCPY and -DHAVE_STRLCAT.")
  add_definitions(-DHAVE_STRLCPY)
  add_definitions(-DHAVE_STRLCAT)
else()
  message(STATUS "No strlcpy and strlcat found, will use local definition")
endif()

if(CMAKE_SYSTEM_NAME MATCHES "Linux")
  include(driver)
endif()
include(libscap)
include(libsinsp)