# SPDX-License-Identifier: BSD-2-Clause

# Copyright (c) 2021 NKI/AVL, Netherlands Cancer Institute

# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:

# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

cmake_minimum_required(VERSION 3.23)

if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR AND NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
	set(CMAKE_BUILD_TYPE Release CACHE STRING "Build type" FORCE)
	set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
endif()

# set the project name
project(
	libcifpp
	VERSION 9.0.5
	LANGUAGES CXX C)

list(PREPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

include(FindAtomic)
include(CMakePackageConfigHelpers)
include(GenerateExportHeader)
include(CTest)
include(ExternalProject)
include(FetchContent)

# When building with ninja-multiconfig, build both debug and release by default
if(CMAKE_GENERATOR STREQUAL "Ninja Multi-Config")
	set(CMAKE_CROSS_CONFIGS "Debug;Release")
	set(CMAKE_DEFAULT_CONFIGS "Debug;Release")
endif()

if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
	set(CMAKE_CXX_FLAGS
		"${CMAKE_CXX_FLAGS} -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers"
	)
elseif(MSVC)
	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
endif()

# Build documentation?
set(BUILD_DOCUMENTATION OFF CACHE BOOL "Build the documentation")

# Optionally build a version to be installed inside CCP4
set(BUILD_FOR_CCP4 OFF CACHE BOOL "Build a version to be installed in CCP4")

# Building shared libraries?
if(NOT(BUILD_FOR_CCP4 AND WIN32))
	set(BUILD_SHARED_LIBS OFF CACHE BOOL "Build a shared library instead of a static one")
endif()

if(PROJECT_IS_TOP_LEVEL AND NOT BUILD_FOR_CCP4)
	# Lots of code depend on the availability of the components.cif file
	set(CIFPP_DOWNLOAD_CCD ON CACHE BOOL "Download the CCD file components.cif during installation")

	# An optional cron script can be installed to keep the data files up-to-date
	if(UNIX AND NOT APPLE)
		set(CIFPP_INSTALL_UPDATE_SCRIPT ON CACHE BOOL "Install the script to update CCD and dictionary files")
	endif()
else()
	unset(CIFPP_DOWNLOAD_CCD)
	unset(CIFPP_INSTALL_UPDATE_SCRIPT)
endif()

# When CCP4 is sourced in the environment, we can recreate the symmetry
# operations table
if(EXISTS "$ENV{CCP4}/lib/data/syminfo.lib")
	set(CIFPP_RECREATE_SYMOP_DATA ON CACHE BOOL "Recreate SymOp data table in case it is out of date")
endif()

# CCP4 build
if(BUILD_FOR_CCP4)
	if("$ENV{CCP4}" STREQUAL "" OR NOT EXISTS $ENV{CCP4})
		message(FATAL_ERROR "cifpp: A CCP4 built was requested but CCP4 was not sourced")
	else()
		list(PREPEND CMAKE_MODULE_PATH "$ENV{CCP4}")
		list(PREPEND CMAKE_PREFIX_PATH "$ENV{CCP4}")
		set(CMAKE_INSTALL_PREFIX "$ENV{CCP4}")

		if(WIN32)
			set(BUILD_SHARED_LIBS ON)
		endif()
	endif()
endif()

# Now include the GNUInstallDirs module
include(GNUInstallDirs)

if(WIN32)
	if(${CMAKE_SYSTEM_VERSION} GREATER_EQUAL 10) # Windows 10
		add_definitions(-D _WIN32_WINNT=0x0A00)
	elseif(${CMAKE_SYSTEM_VERSION} EQUAL 6.3) # Windows 8.1
		add_definitions(-D _WIN32_WINNT=0x0603)
	elseif(${CMAKE_SYSTEM_VERSION} EQUAL 6.2) # Windows 8
		add_definitions(-D _WIN32_WINNT=0x0602)
	elseif(${CMAKE_SYSTEM_VERSION} EQUAL 6.1) # Windows 7
		add_definitions(-D _WIN32_WINNT=0x0601)
	elseif(${CMAKE_SYSTEM_VERSION} EQUAL 6.0) # Windows Vista
		add_definitions(-D _WIN32_WINNT=0x0600)
	else() # Windows XP (5.1)
		add_definitions(-D _WIN32_WINNT=0x0501)
	endif()

	# We do not want to write an export file for all our symbols...
	set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
endif()

if(MSVC)
	# make msvc standards compliant...
	add_compile_options(/permissive- /bigobj)
	add_link_options(/NODEFAULTLIB:library)

	# This is dubious...
	if(BUILD_SHARED_LIBS)
		set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
	else()
		set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
	endif()
endif()

# Libraries

if(MSVC)
	# Avoid linking the shared library of zlib. Search ZLIB_ROOT first if it is
	# set.
	if(ZLIB_ROOT)
		set(_ZLIB_SEARCH_ROOT PATHS ${ZLIB_ROOT} NO_DEFAULT_PATH)
		list(APPEND _ZLIB_SEARCHES _ZLIB_SEARCH_ROOT)
	endif()

	# Normal search.
	set(_ZLIB_x86 "(x86)")
	set(_ZLIB_SEARCH_NORMAL
		PATHS "[HKEY_LOCAL_MACHINE\\SOFTWARE\\GnuWin32\\Zlib;InstallPath]"
		"$ENV{ProgramFiles}/zlib" "$ENV{ProgramFiles${_ZLIB_x86}}/zlib")
	unset(_ZLIB_x86)
	list(APPEND _ZLIB_SEARCHES _ZLIB_SEARCH_NORMAL)

	if(BUILD_FOR_CCP4)
		list(PREPEND _ZLIB_SEARCHES "$ENV{CCP4}/lib")
	endif()

	foreach(search ${_ZLIB_SEARCHES})
		find_library(
			ZLIB_LIBRARY
			NAMES zlibstatic NAMES_PER_DIR ${${search}}
			PATH_SUFFIXES lib)
	endforeach()
endif()

# Using fast_float for float parsing, but only if needed
try_compile(STD_CHARCONV_COMPILING
	SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/cmake/test-charconv.cpp)

if(NOT STD_CHARCONV_COMPILING)
	message(NOTICE "libcifpp: Using fast_float for std::from_chars")
	FetchContent_Declare(fastfloat
		GIT_REPOSITORY "https://github.com/fastfloat/fast_float"
		GIT_TAG v8.0.2)
	FetchContent_MakeAvailable(fastfloat)
endif()

find_package(Threads)
find_package(ZLIB QUIET)

if(NOT ZLIB_FOUND)
	message(FATAL_ERROR "cifpp: The zlib development files were not found you this system, please install them and try again (hint: on debian/ubuntu use apt-get install zlib1g-dev)")
endif()

include(FindPkgConfig)

if(PKG_CONFIG_FOUND)
	pkg_check_modules(PCRE2 IMPORTED_TARGET libpcre2-8)
endif()

if(NOT PCRE2_FOUND)
	add_subdirectory(pcre2-simple)
endif()

# Using Eigen3 is a bit of a thing. We don't want to build it completely since
# we only need a couple of header files. Nothing special. But often, eigen3 is
# already installed and then we prefer that.
find_package(Eigen3 3.4 QUIET)

if(Eigen3_FOUND AND TARGET Eigen3::Eigen)
	get_target_property(EIGEN_INCLUDE_DIR Eigen3::Eigen
		INTERFACE_INCLUDE_DIRECTORIES)
else()
	# Use ExternalProject since FetchContent always tries to install the result...
	ExternalProject_Add(my-eigen3
		URL https://gitlab.com/libeigen/eigen/-/archive/3.4.0/eigen-3.4.0.zip
		DOWNLOAD_EXTRACT_TIMESTAMP TRUE
		CONFIGURE_COMMAND ""
		BUILD_COMMAND ""
		INSTALL_COMMAND "")

	ExternalProject_Get_Property(my-eigen3 SOURCE_DIR)
	set(EIGEN_INCLUDE_DIR ${SOURCE_DIR})
endif()

# Create a revision file, containing the current git version info
include(VersionString)
write_version_header(${CMAKE_CURRENT_SOURCE_DIR}/src/ LIB_NAME "LibCIFPP")

# SymOp data table
if(CIFPP_RECREATE_SYMOP_DATA)
	# The tool to create the table
	add_executable(symop-map-generator
		"${CMAKE_CURRENT_SOURCE_DIR}/src/symop-map-generator.cpp")

	target_compile_features(symop-map-generator PUBLIC cxx_std_20)

	add_custom_command(
		OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/src/symop_table_data.hpp
		COMMAND
		$<TARGET_FILE:symop-map-generator> $ENV{CLIBD}/syminfo.lib
		$ENV{CLIBD}/symop.lib ${CMAKE_CURRENT_SOURCE_DIR}/src/symop_table_data.hpp)

	add_custom_target(
		OUTPUT
		${CMAKE_CURRENT_SOURCE_DIR}/src/symop_table_data.hpp
		DEPENDS symop-map-generator "$ENV{CLIBD}/syminfo.lib"
		"$ENV{CLIBD}/symop.lib")
endif()

# Sources
set(project_sources
	${CMAKE_CURRENT_SOURCE_DIR}/src/category.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/condition.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/datablock.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/dictionary_parser.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/file.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/item.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/parser.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/row.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/validate.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/text.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/utilities.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/atom_type.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/compound.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/point.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/symmetry.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/model.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/pdb/cif2pdb.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/pdb/pdb2cif.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/pdb/pdb_record.hpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/pdb/pdb2cif_remark_3.hpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/pdb/pdb2cif_remark_3.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/pdb/reconstruct.cpp
	${CMAKE_CURRENT_SOURCE_DIR}/src/pdb/validate-pdbx.cpp
)

set(project_headers
	include/cif++.hpp
	include/cif++/atom_type.hpp
	include/cif++/category.hpp
	include/cif++/compound.hpp
	include/cif++/condition.hpp
	include/cif++/datablock.hpp
	include/cif++/dictionary_parser.hpp
	include/cif++/exports.hpp
	include/cif++/file.hpp
	include/cif++/format.hpp
	include/cif++/forward_decl.hpp
	include/cif++/gzio.hpp
	include/cif++/item.hpp
	include/cif++/iterator.hpp
	include/cif++/matrix.hpp
	include/cif++/model.hpp
	include/cif++/parser.hpp
	include/cif++/pdb/cif2pdb.hpp
	include/cif++/pdb.hpp
	include/cif++/pdb/io.hpp
	include/cif++/pdb/pdb2cif.hpp
	include/cif++/pdb/tls.hpp
	include/cif++/point.hpp
	include/cif++/row.hpp
	include/cif++/symmetry.hpp
	include/cif++/text.hpp
	include/cif++/utilities.hpp
	include/cif++/validate.hpp
)

add_library(cifpp)
add_library(cifpp::cifpp ALIAS cifpp)

if(TARGET my-eigen3)
	add_dependencies(cifpp my-eigen3)
endif()

target_sources(cifpp
	PRIVATE ${project_sources}
	${CMAKE_CURRENT_SOURCE_DIR}/src/symop_table_data.hpp
	PUBLIC
	FILE_SET cifpp_headers TYPE HEADERS
	BASE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/include
	FILES ${project_headers}
)

# The code now really requires C++20
target_compile_features(cifpp PUBLIC cxx_std_20)

generate_export_header(cifpp EXPORT_FILE_NAME
	${CMAKE_CURRENT_SOURCE_DIR}/include/cif++/exports.hpp)

if(MSVC)
	target_compile_definitions(cifpp PUBLIC NOMINMAX=1)
endif()

set_target_properties(cifpp PROPERTIES POSITION_INDEPENDENT_CODE ON)

target_include_directories(
	cifpp
	PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>"
	"$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
	PRIVATE "${EIGEN_INCLUDE_DIR}")

target_link_libraries(cifpp
	PUBLIC Threads::Threads ZLIB::ZLIB $<$<TARGET_EXISTS:std::atomic>:std::atomic>)

if(PCRE2_FOUND)
	target_include_directories(cifpp PRIVATE ${PCRE2_INCLUDE_DIRS})
	target_link_libraries(cifpp PRIVATE ${PCRE2_LINK_LIBRARIES})
else()
	target_link_libraries(cifpp PRIVATE $<BUILD_INTERFACE:pcre2s>)
endif()

if(NOT STD_CHARCONV_COMPILING)
	target_link_libraries(cifpp PUBLIC FastFloat::fast_float)
endif()

if(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
	target_link_options(cifpp PRIVATE -undefined dynamic_lookup)
endif(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")

if(CIFPP_DOWNLOAD_CCD)
	# download the components.cif file from CCD
	set(COMPONENTS_CIF ${CMAKE_CURRENT_SOURCE_DIR}/rsrc/components.cif)

	if(EXISTS ${COMPONENTS_CIF})
		file(SIZE ${COMPONENTS_CIF} CCD_FILE_SIZE)

		if(CCD_FILE_SIZE EQUAL 0)
			message(STATUS "cifpp: Removing empty ${COMPONENTS_CIF} file")
			file(REMOVE "${COMPONENTS_CIF}")
		endif()
	endif()

	if(NOT EXISTS ${COMPONENTS_CIF})
		# Since the file(DOWNLOAD) command in cmake does not use compression, we try
		# to download the gzipped version and decompress it ourselves.
		find_program(GUNZIP gunzip)

		if(WIN32 OR GUNZIP STREQUAL "GUNZIP-NOTFOUND")
			file(
				DOWNLOAD https://files.wwpdb.org/pub/pdb/data/monomers/components.cif
				${COMPONENTS_CIF}
				SHOW_PROGRESS
				STATUS CCD_FETCH_STATUS)
		else()
			if(NOT EXISTS "${COMPONENTS_CIF}.gz")
				file(
					DOWNLOAD
					https://files.wwpdb.org/pub/pdb/data/monomers/components.cif.gz
					${COMPONENTS_CIF}.gz
					SHOW_PROGRESS
					STATUS CCD_FETCH_STATUS)
			endif()

			add_custom_command(
				OUTPUT ${COMPONENTS_CIF}
				COMMAND "${GUNZIP}" ${COMPONENTS_CIF}.gz
				WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/rsrc/)

			add_custom_target(COMPONENTS ALL DEPENDS ${COMPONENTS_CIF})
		endif()

		# Do not continue if downloading went wrong
		list(POP_FRONT CCD_FETCH_STATUS CCD_FETCH_STATUS_CODE)

		if(CCD_FETCH_STATUS_CODE)
			message(
				FATAL_ERROR "cifpp: Error trying to download CCD file: ${CCD_FETCH_STATUS}")
		endif()
	endif()
endif()

# Installation directories
if(BUILD_FOR_CCP4)
	set(CIFPP_DATA_DIR
		"$ENV{CCP4}/share/libcifpp"
		CACHE PATH "Directory where dictionary and other static data is stored")
else()
	set(CIFPP_DATA_DIR
		"${CMAKE_INSTALL_FULL_DATADIR}/libcifpp"
		CACHE PATH "Directory where dictionary and other static data is stored")
endif()

if(CIFPP_DATA_DIR)
	target_compile_definitions(cifpp PUBLIC DATA_DIR="${CIFPP_DATA_DIR}")
	set_target_properties(cifpp PROPERTIES CIFPP_DATA_DIR ${CIFPP_DATA_DIR})
endif()

if(NOT PROJECT_IS_TOP_LEVEL)
	set(CIFPP_SHARE_DIR ${CIFPP_DATA_DIR} PARENT_SCOPE)
endif()

if(UNIX AND NOT BUILD_FOR_CCP4)
	if("${CMAKE_INSTALL_PREFIX}" STREQUAL "/usr/local")
		set(CIFPP_CACHE_DIR
			"/var/cache/libcifpp"
			CACHE PATH "The directory where downloaded data files are stored")
	else()
		set(CIFPP_CACHE_DIR
			"${CMAKE_INSTALL_FULL_LOCALSTATEDIR}/cache/libcifpp"
			CACHE PATH "The directory where downloaded data files are stored")
	endif()

	target_compile_definitions(cifpp PUBLIC CACHE_DIR="${CIFPP_CACHE_DIR}")

	set(CIFPP_ETC_DIR
		"${CMAKE_INSTALL_FULL_SYSCONFDIR}"
		CACHE PATH "The directory where the update configuration file is stored")
else()
	unset(CIFPP_CACHE_DIR)
endif()

# Install rules
install(TARGETS cifpp
	EXPORT cifpp
	FILE_SET cifpp_headers DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})

if(MSVC AND BUILD_SHARED_LIBS)
	install(
		FILES $<TARGET_PDB_FILE:cifpp>
		DESTINATION ${CMAKE_INSTALL_LIBDIR}
		OPTIONAL)
endif()

# Clean up old config files (with old names)
file(GLOB OLD_CONFIG_FILES
	${CMAKE_INSTALL_FULL_LIBDIR}/cmake/cifpp/cifppConfig*.cmake
	${CMAKE_INSTALL_FULL_LIBDIR}/cmake/cifpp/cifppTargets*.cmake)

if(OLD_CONFIG_FILES)
	message(
		STATUS "cifpp: Installation will remove old config files: ${OLD_CONFIG_FILES}")
	install(CODE "file(REMOVE ${OLD_CONFIG_FILES})")
endif()

install(EXPORT cifpp
	NAMESPACE cifpp::
	FILE "cifpp-targets.cmake"
	DESTINATION lib/cmake/cifpp)

install(
	FILES ${CMAKE_CURRENT_SOURCE_DIR}/rsrc/mmcif_ddl.dic
	${CMAKE_CURRENT_SOURCE_DIR}/rsrc/mmcif_pdbx.dic
	${CMAKE_CURRENT_SOURCE_DIR}/rsrc/mmcif_ma.dic
	DESTINATION ${CMAKE_INSTALL_DATADIR}/libcifpp)

if(CIFPP_DATA_DIR AND CIFPP_DOWNLOAD_CCD)
	install(FILES ${COMPONENTS_CIF}
		DESTINATION ${CMAKE_INSTALL_DATADIR}/libcifpp)
endif()

set(CONFIG_TEMPLATE_FILE ${CMAKE_CURRENT_SOURCE_DIR}/cmake/cifpp-config.cmake.in)

configure_package_config_file(
	${CONFIG_TEMPLATE_FILE} ${CMAKE_CURRENT_BINARY_DIR}/cifpp/cifpp-config.cmake
	INSTALL_DESTINATION lib/cmake/cifpp
	PATH_VARS CIFPP_DATA_DIR)

install(
	FILES "${CMAKE_CURRENT_BINARY_DIR}/cifpp/cifpp-config.cmake"
	"${CMAKE_CURRENT_BINARY_DIR}/cifpp/cifpp-config-version.cmake"
	DESTINATION lib/cmake/cifpp)

set_target_properties(
	cifpp
	PROPERTIES VERSION ${PROJECT_VERSION}
	SOVERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}"
	INTERFACE_cifpp_MAJOR_VERSION ${PROJECT_VERSION_MAJOR})

set_property(
	TARGET cifpp
	APPEND
	PROPERTY COMPATIBLE_INTERFACE_STRING cifpp_MAJOR_VERSION)

write_basic_package_version_file(
	"${CMAKE_CURRENT_BINARY_DIR}/cifpp/cifpp-config-version.cmake"
	VERSION ${PROJECT_VERSION}
	COMPATIBILITY AnyNewerVersion)

if(BUILD_TESTING AND PROJECT_IS_TOP_LEVEL)
	add_subdirectory(test)
endif()

# Optionally install the update scripts for CCD and dictionary files
if(CIFPP_INSTALL_UPDATE_SCRIPT)
	configure_file(${CMAKE_CURRENT_SOURCE_DIR}/tools/update-libcifpp-data.in
		update-libcifpp-data @ONLY)

	if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux" OR
		${CMAKE_SYSTEM_NAME} STREQUAL "GNU" OR
		${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
		install(
			FILES ${CMAKE_CURRENT_BINARY_DIR}/update-libcifpp-data
			DESTINATION ${CMAKE_INSTALL_SYSCONFDIR}/cron.weekly
			PERMISSIONS OWNER_EXECUTE OWNER_READ GROUP_EXECUTE GROUP_READ WORLD_EXECUTE
			WORLD_READ)
	else()
		message(FATAL_ERROR "cifpp: Don't know where to install the update script")
	endif()

	# a config file, to make it complete
	# install(DIRECTORY DESTINATION "${CMAKE_INSTALL_LOCALSTATEDIR}/libcifpp")
	if(NOT EXISTS "${CMAKE_INSTALL_SYSCONFDIR}/libcifpp.conf")
		file(
			WRITE ${CMAKE_CURRENT_BINARY_DIR}/libcifpp.conf
			[[# Uncomment the next line to enable automatic updates
# update=true
]])
		install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libcifpp.conf
			DESTINATION ${CMAKE_INSTALL_SYSCONFDIR})
		install(
			CODE "message(\"cifpp: A configuration file has been written to ${CIFPP_ETC_DIR}/libcifpp.conf, please edit this file to enable automatic updates\")"
		)

		install(DIRECTORY DESTINATION ${CMAKE_INSTALL_SYSCONFDIR}/libcifpp/cache-update.d)
	endif()

	target_compile_definitions(cifpp PUBLIC CACHE_DIR="${CIFPP_CACHE_DIR}")
endif()

if(BUILD_DOCUMENTATION)
	add_subdirectory(docs)
endif()
