include(CMakeDependentOption)
cmake_minimum_required(VERSION 3.0.2)
project(rexbacklight)

#setup common defines for C files
set(rexbacklight_VERSION_MAJOR 1)
set(rexbacklight_VERSION_MINOR 3)
set(INCLUDE_PATH ${CMAKE_SOURCE_DIR}/include)
configure_file(
	"${INCLUDE_PATH}/config.h.in"
	"${INCLUDE_PATH}/config.h"
)

#set project include directory
include_directories("${INCLUDE_PATH}")

#setup cmake options
option(BUILD_REXLEDCTL "Build led control program" ON)
option(BUILD_REXBACKLIGHT "Build backlight control program" ON)
option(XBACKLIGHT_COMPAT "Use xbacklight style options (eg -get -inc -dec)" OFF)
CMAKE_DEPENDENT_OPTION(INSTALL_UDEV_LED_RULE "Install the udev rule to allow users of video group to control led devices" ON
	"BUILD_REXLEDCTL" OFF)
CMAKE_DEPENDENT_OPTION(INSTALL_UDEV_BACKLIGHT_RULE "Install the udev rule to allow users of video group to control backlight devices" ON
	"BUILD_REXBACKLIGHT" OFF)
set(UDEV_DIR "/etc/udev/rules.d" CACHE STRING "Set the output directory for udev rules")
mark_as_advanced(UDEV_DIR)

if(XBACKLIGHT_COMPAT)
	add_definitions(-DXBACKLIGHT_COMPAT_OPTIONS)
endif()

#locate rjp library requirements
find_library(RJP_LIB rjp)
find_path(RJP_HEADER_DIR rjp.h)

#temporary library (no actual library generated)
add_library(common_srcs OBJECT src/cmd.c src/common.c)

if(BUILD_REXLEDCTL)
	add_executable (rexledctl src/rexbacklight.c)
	add_dependencies(rexledctl common_srcs)                 #force common_srcs to be built first
	target_compile_definitions(rexledctl PRIVATE REXLEDCTL) #define REXLEDCTL in C files
	target_link_libraries(rexledctl PRIVATE "${RJP_LIB}")   #link with rjp
	target_link_libraries(rexledctl PRIVATE $<TARGET_OBJECTS:common_srcs>) #link with the common_srcs "library"
	target_include_directories(rexledctl PUBLIC "${RJP_HEADER_DIR}") #include rjp.h directory
	install(TARGETS rexledctl RUNTIME DESTINATION bin)
	if(INSTALL_UDEV_LED_RULE)
		install(FILES ${CMAKE_SOURCE_DIR}/rules/91-leds.rules DESTINATION ${UDEV_DIR})
	endif()
endif()
if(BUILD_REXBACKLIGHT)
	add_executable (rexbacklight src/rexbacklight.c)
	add_dependencies(rexledctl common_srcs)
	target_compile_definitions(rexbacklight PRIVATE REXBACKLIGHT)
	target_link_libraries(rexbacklight PRIVATE "${RJP_LIB}")
	target_link_libraries(rexbacklight PRIVATE $<TARGET_OBJECTS:common_srcs>)
	target_include_directories(rexbacklight PUBLIC "${RJP_HEADER_DIR}")
	install(TARGETS rexbacklight RUNTIME DESTINATION bin)
	if(INSTALL_UDEV_BACKLIGHT_RULE)
		install(FILES ${CMAKE_SOURCE_DIR}/rules/91-backlight.rules DESTINATION ${UDEV_DIR})
	endif()
endif()

#uninstall target
add_custom_target(uninstall cat install_manifest.txt | xargs rm)