############################################################################
#
# Copyright (c) 2017 PX4 Development Team. All rights reserved.
#
# 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.
# 3. Neither the name PX4 nor the names of its contributors may be
#    used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# 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 CODING STANDARD FOR PX4
#
# Structure
# ---------------------------------------------------------------------------
#
# * Common functions should be included in px_base.cmake.
#
# * OS/ board specific fucntions should be include in
#	px_impl_${OS}.cmake or px4_impl_${OS}_${BOARD}.cmake.
#
# Formatting
# ---------------------------------------------------------------------------
#
# * Use hard indents to match the px4 source code.
#
# * All function and script arguments are upper case.
#
# * All local variables are lower case.
#
# * All cmake functions are lowercase.
#
# * For else, endif, endfunction, etc, never put the name of the statement
#
# Functions/Macros
# ---------------------------------------------------------------------------
#
# * Use px4_parse_function_args to parse functions and check for required
#   arguments. Unless there is only one argument in the function and it is clear.
#
# * Never use macros. They allow overwriting global variables and this
#	makes variable declarations hard to locate.
#
# * If a target from add_custom_* is set in a function, explicitly pass it
#	as an output argument so that the target name is clear to the user.
#
# * Avoid use of global variables in functions. Functions in a nested
#	scope may use global variables, but this makes it difficult to
#	reuse functions.
#
# Included CMake Files
# ---------------------------------------------------------------------------
#
# * All variables in config files must have the prefix "config_".
#
# * Never set global variables in an included cmake file,
#	you may only define functions. This excludes config and Toolchain files.
#	This makes it clear to the user when variables are being set or targets
#	are being created.
#
# * Setting a global variable in a CMakeLists.txt file is ok, because
#	each CMakeLists.txt file has scope in the current directory and all
#	subdirectories, so it is not truly global.
#
# * All toolchain files should be included in the cmake
#	directory and named Toolchain-"name".cmake.
#
# Misc
# ---------------------------------------------------------------------------
#
# * If referencing a string variable, don't put it in quotes.
#	Don't do "${OS}" STREQUAL "posix",
#	instead type ${OS} STREQUAL "posix". This will throw an
#	error when ${OS} is not defined instead of silently
#	evaluating to false.
#
#=============================================================================

cmake_minimum_required(VERSION 3.2 FATAL_ERROR)

set(PX4_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
set(PX4_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}")

list(APPEND CMAKE_MODULE_PATH "${PX4_SOURCE_DIR}/cmake")

#=============================================================================
# git
#
include(common/px4_git)

execute_process(
	COMMAND git describe --always --tags
	OUTPUT_VARIABLE PX4_GIT_TAG
	OUTPUT_STRIP_TRAILING_WHITESPACE
	WORKING_DIRECTORY ${PX4_SOURCE_DIR}
	)

define_property(GLOBAL PROPERTY PX4_MODULE_LIBRARIES
                 BRIEF_DOCS "PX4 module libs"
                 FULL_DOCS "List of all PX4 module libraries"
                 )

define_property(GLOBAL PROPERTY PX4_MODULE_PATHS
                 BRIEF_DOCS "PX4 module paths"
                 FULL_DOCS "List of paths to all PX4 modules"
                 )

#=============================================================================
# configuration
#

set(CONFIG "posix_sitl_default" CACHE STRING "desired configuration")

string(REPLACE "_" ";" config_args ${CONFIG})
list(GET config_args 0 OS)
list(GET config_args 1 BOARD)
list(GET config_args 2 LABEL)

set(THREADS "4" CACHE STRING "number of threads to use for external build processes")
set(DEBUG_PORT "/dev/ttyACM0" CACHE STRING "debugging port")
set(EXTERNAL_MODULES_LOCATION "" CACHE STRING "External modules source location")

if (NOT EXTERNAL_MODULES_LOCATION STREQUAL "")
	get_filename_component(EXTERNAL_MODULES_LOCATION "${EXTERNAL_MODULES_LOCATION}" ABSOLUTE)
endif()

include(platforms/${OS}/cmake/px4_impl_os.cmake)
include(configs/${CONFIG})
list(APPEND CMAKE_MODULE_PATH ${PX4_SOURCE_DIR}/platforms/${OS}/cmake)

# CMake build type (Debug Release RelWithDebInfo MinSizeRel Coverage)
if (NOT CMAKE_BUILD_TYPE)
	if (${OS} STREQUAL "nuttx")
		set(PX4_BUILD_TYPE "MinSizeRel")
	else()
		set(PX4_BUILD_TYPE "RelWithDebInfo")
	endif()

	set(CMAKE_BUILD_TYPE ${PX4_BUILD_TYPE} CACHE STRING "Build type" FORCE)
endif()

set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug;Release;RelWithDebInfo;MinSizeRel;Coverage")

#=============================================================================

message(STATUS "PX4 VERSION: ${PX4_GIT_TAG}")
message(STATUS "CONFIG: ${CONFIG}")
message(STATUS "Build Type: ${CMAKE_BUILD_TYPE}")

#=============================================================================
# project definition
#
project(px4 CXX C ASM)

set(package-contact "px4users@googlegroups.com")

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_C_STANDARD 99)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PX4_BINARY_DIR})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG ${PX4_BINARY_DIR})
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE ${PX4_BINARY_DIR})

#=============================================================================

# Setup install paths
if (${OS} STREQUAL "posix")

	include(common/coverage)
	include(common/sanitizers)

	# Define GNU standard installation directories
	include(GNUInstallDirs)

	if (NOT CMAKE_INSTALL_PREFIX)
		set(CMAKE_INSTALL_PREFIX "/usr" CACHE PATH "Install path prefix" FORCE)
	endif()

	# cmake testing only on posix
	enable_testing()
	include(CTest)
endif()

#=============================================================================
# require px4 module interface
set(px4_required_interface
	px4_os_prebuild_targets
	px4_os_add_flags
	)
foreach(cmd ${px4_required_interface})
	if (NOT COMMAND ${cmd})
		message(FATAL_ERROR "${CONFIG} must implement ${cmd}")
	endif()
endforeach()

set(px4_required_config config_module_list)
foreach(conf ${px4_required_config})
	if (NOT DEFINED ${conf})
		message(FATAL_ERROR "cmake/${CONFIG} must define ${conf}")
	endif()
endforeach()

#=============================================================================
# ccache
#
option(CCACHE "Use ccache if available" ON)
find_program(CCACHE_PROGRAM ccache)
if (CCACHE AND CCACHE_PROGRAM AND NOT DEFINED ENV{CCACHE_DISABLE})

	get_filename_component(ccache_real_path ${CCACHE_PROGRAM} REALPATH)
	get_filename_component(cxx_real_path ${CMAKE_CXX_COMPILER} REALPATH)
	get_filename_component(cxx_abs_path ${CMAKE_CXX_COMPILER} ABSOLUTE)

	if ("${ccache_real_path}" STREQUAL "${cxx_real_path}")
		message(STATUS "ccache enabled via symlink (${cxx_abs_path} -> ${cxx_real_path})")
	else()
		message(STATUS "ccache enabled (export CCACHE_DISABLE=1 to disable)")
		set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_PROGRAM}")
	endif()

endif()

#=============================================================================
# find programs and packages
#

# see if catkin was invoked to build this
if (CATKIN_DEVEL_PREFIX)
	message(STATUS "catkin ENABLED")
	find_package(catkin REQUIRED)
	if (catkin_FOUND)
		catkin_package()
	else()
		message(FATAL_ERROR "catkin not found")
	endif()
endif()

find_package(PythonInterp REQUIRED)
px4_find_python_module(jinja2 REQUIRED)

#=============================================================================
# check required toolchain variables
#

set(required_variables CMAKE_C_COMPILER_ID CMAKE_CXX_COMPILER_ID)
foreach(var ${required_variables})
	if (NOT ${var})
		message(FATAL_ERROR "Toolchain/config must define ${var}")
	endif()
endforeach()

# print full c compiler version
execute_process(COMMAND ${CMAKE_C_COMPILER} --version
		OUTPUT_VARIABLE c_compiler_version
		OUTPUT_STRIP_TRAILING_WHITESPACE
		)
STRING(REGEX MATCH "[^\n]*" c_compiler_version_short ${c_compiler_version})
message(STATUS "C compiler: ${c_compiler_version_short}")

# print full c++ compiler version
execute_process(COMMAND ${CMAKE_CXX_COMPILER} --version
		OUTPUT_VARIABLE cxx_compiler_version
		OUTPUT_STRIP_TRAILING_WHITESPACE
		)
STRING(REGEX MATCH "[^\n]*" cxx_compiler_version_short ${cxx_compiler_version})
message(STATUS "C++ compiler: ${cxx_compiler_version_short}")

#=============================================================================
# external libraries
#
px4_os_prebuild_targets(OUT prebuild_targets
	BOARD ${BOARD}
	THREADS ${THREADS})

#=============================================================================
# build flags
#
px4_os_add_flags(
	BOARD ${BOARD}
	C_FLAGS c_flags
	CXX_FLAGS cxx_flags
	OPTIMIZATION_FLAGS optimization_flags
	EXE_LINKER_FLAGS exe_linker_flags
	INCLUDE_DIRS include_dirs
	LINK_DIRS link_dirs
	DEFINITIONS definitions)

px4_join(OUT CMAKE_EXE_LINKER_FLAGS LIST "${CMAKE_EXE_LINKER_FLAGS};${exe_linker_flags}" GLUE " ")
px4_join(OUT CMAKE_C_FLAGS LIST "${CMAKE_C_FLAGS};${c_flags};${optimization_flags}" GLUE " ")
px4_join(OUT CMAKE_CXX_FLAGS LIST "${CMAKE_CXX_FLAGS};${cxx_flags};${optimization_flags}" GLUE " ")

#=============================================================================
# message, and airframe generation
#
include(common/px4_metadata)

add_subdirectory(msg EXCLUDE_FROM_ALL)

px4_generate_airframes_xml(BOARD ${BOARD})

#=============================================================================
# DriverFramework
#
px4_add_git_submodule(TARGET git_driverframework PATH "src/lib/DriverFramework")
add_subdirectory(src/lib/DriverFramework/framework)

# List the DriverFramework drivers
if (DEFINED config_df_driver_list)
	message("DF Drivers: ${config_df_driver_list}")
endif()

set(df_driver_libs)
foreach(driver ${config_df_driver_list})
	add_subdirectory(src/lib/DriverFramework/drivers/${driver})
	list(APPEND df_driver_libs df_${driver})
	message("Adding DF driver: ${driver}")
endforeach()

#=============================================================================
# external projects
#
set(ep_base ${PX4_BINARY_DIR}/external)
set_property(DIRECTORY PROPERTY EP_BASE ${ep_base})

# add external project install folders to build
link_directories(${ep_base}/Install/lib)
include_directories(${ep_base}/Install/include)
# add the directories so cmake won't warn
execute_process(COMMAND cmake -E make_directory ${ep_base}/Install/lib)
execute_process(COMMAND cmake -E make_directory ${ep_base}/Install/include)

#=============================================================================
# external modules
#
set(external_module_paths)
if (NOT EXTERNAL_MODULES_LOCATION STREQUAL "")
	message(STATUS "External modules: ${EXTERNAL_MODULES_LOCATION}")
	add_subdirectory("${EXTERNAL_MODULES_LOCATION}/src" external_modules)

	foreach(external_module ${config_module_list_external})
		add_subdirectory(${EXTERNAL_MODULES_LOCATION}/src/${external_module} external_modules/${external_module})
		list(APPEND external_module_paths ${EXTERNAL_MODULES_LOCATION}/src/${external_module})
	endforeach()
endif()

#=============================================================================
# subdirectories
#
add_library(parameters_interface INTERFACE)
add_subdirectory(src/lib EXCLUDE_FROM_ALL)
add_subdirectory(src/platforms/common EXCLUDE_FROM_ALL)
add_subdirectory(src/modules/systemlib EXCLUDE_FROM_ALL) # TODO: split into libraries in platform layer
add_subdirectory(src/modules/uORB EXCLUDE_FROM_ALL) # TODO: platform layer
add_subdirectory(src/drivers/boards EXCLUDE_FROM_ALL)

foreach(module ${config_module_list})
	add_subdirectory(src/${module})
endforeach()

# must be the last module before firmware
add_subdirectory(src/lib/parameters EXCLUDE_FROM_ALL)
target_link_libraries(parameters_interface INTERFACE parameters)

# firmware added last to generate the builtin for included modules
add_subdirectory(platforms/${OS})

#=============================================================================
# generate custom target to print for all executable and module cmake targets
#
if (all_posix_cmake_targets)
	list(SORT all_posix_cmake_targets)
	px4_join(OUT posix_cmake_target_list LIST ${all_posix_cmake_targets} GLUE "\\n")
	add_custom_target(list_cmake_targets
		COMMAND sh -c "printf \"${posix_cmake_target_list}\\n\""
		COMMENT "List of cmake targets that can be matched by PX4_NO_OPTIMIZATION:"
		VERBATIM
		)
endif()


#=============================================================================
# uORB graph generation: add a custom target 'uorb_graph'
#
set(uorb_graph_config ${BOARD})

set(graph_module_list "")
foreach(module ${config_module_list})
	set(graph_module_list "${graph_module_list}" "--src-path" "src/${module}")
endforeach()

add_custom_command(OUTPUT ${uorb_graph_config}
	COMMAND ${PYTHON_EXECUTABLE} ${PX4_SOURCE_DIR}/Tools/uorb_graph/create.py
		${module_list}
		--exclude-path src/examples
		--file ${PX4_SOURCE_DIR}/Tools/uorb_graph/graph_${uorb_graph_config}
	WORKING_DIRECTORY ${PX4_SOURCE_DIR}
	COMMENT "Generating uORB graph"
)
add_custom_target(uorb_graph DEPENDS ${uorb_graph_config})

#=============================================================================
# Doxygen
#
option(BUILD_DOXYGEN "Build doxygen documentation" OFF)

if (BUILD_DOXYGEN)
	find_package(Doxygen)
	if (DOXYGEN_FOUND)
	    # set input and output files
	    set(DOXYGEN_IN ${CMAKE_SOURCE_DIR}/Documentation/Doxyfile.in)
	    set(DOXYGEN_OUT ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile)

	    # request to configure the file
	    configure_file(${DOXYGEN_IN} ${DOXYGEN_OUT} @ONLY)

	    # note the option ALL which allows to build the docs together with the application
	    add_custom_target(doxygen ALL
	        COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYGEN_OUT}
	        WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
			COMMENT "Generating documentation with Doxygen"
			DEPENDS uorb_msgs parameters
			VERBATIM
			USES_TERMINAL
			)

	else()
		message("Doxygen needs to be installed to generate documentation")
	endif()
endif()

#=============================================================================
# packaging
#
# Important to having packaging at end of cmake file.
#
set(CPACK_PACKAGE_NAME ${PROJECT_NAME}-${CONFIG})
set(CPACK_PACKAGE_VERSION ${PX4_GIT_TAG})
set(CPACK_PACKAGE_CONTACT ${package-contact})
set(CPACK_DEBIAN_PACKAGE_SHLIBDEPS ON)
set(CPACK_DEBIAN_PACKAGE_SECTION "devel")
set(CPACK_DEBIAN_PACKAGE_PRIORITY "optional")
set(CPACK_DEBIAN_PACKAGE_DESCRIPTION "The PX4 Pro autopilot.")
set(CPACK_PACKAGE_FILE_NAME "${PROJECT_NAME}-${CONFIG}-${PX4_GIT_TAG}")
set(CPACK_SOURCE_PACKAGE_FILE_NAME "${PROJECT_NAME}-${PX4_GIT_TAG}")
set(CPACK_SOURCE_GENERATOR "ZIP;TBZ2")
set(CPACK_PACKAGING_INSTALL_PREFIX "")
set(CPACK_SET_DESTDIR "OFF")

if ("${CMAKE_SYSTEM}" MATCHES "Linux")
	set(CPACK_GENERATOR "TBZ2")
	find_program(DPKG_PROGRAM dpkg)
	if (EXISTS ${DPKG_PROGRAM})
		list (APPEND CPACK_GENERATOR "DEB")
	endif()
else()
	set(CPACK_GENERATOR "ZIP")
endif()

include(CPack)