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#############################################################################

add_subdirectory(Utility)

option(EKF2_SYMFORCE_GEN "ekf2 generate symforce output" OFF)

# Symforce code generation TODO:fixme
execute_process(
    COMMAND ${PYTHON_EXECUTABLE} -m symforce.symbolic
    RESULT_VARIABLE PYTHON_SYMFORCE_EXIT_CODE
    OUTPUT_QUIET
)

# for now only provide symforce target helper if derivation.py generation isn't default
if((NOT CONFIG_EKF2_MAGNETOMETER) OR (NOT CONFIG_EKF2_WIND))
	set(EKF2_SYMFORCE_GEN ON)
endif()

set(EKF_DERIVATION_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/EKF/python/ekf_derivation)

set(EKF_GENERATED_FILES ${EKF_DERIVATION_SRC_DIR}/generated/state.h)
set(EKF_GENERATED_DERIVATION_INCLUDE_PATH "${EKF_DERIVATION_SRC_DIR}/..")

if(EKF2_SYMFORCE_GEN AND (${PYTHON_SYMFORCE_EXIT_CODE} EQUAL 0))

	# regenerate default in tree
	add_custom_command(
		OUTPUT
			${EKF_DERIVATION_SRC_DIR}/generated/predict_covariance.h
			${EKF_DERIVATION_SRC_DIR}/generated/state.h
		COMMAND
			${PYTHON_EXECUTABLE} ${EKF_DERIVATION_SRC_DIR}/derivation.py
		DEPENDS
			${EKF_DERIVATION_SRC_DIR}/derivation.py
			${EKF_DERIVATION_SRC_DIR}/derivation_utils.py

		WORKING_DIRECTORY ${EKF_DERIVATION_SRC_DIR}
		COMMENT "Symforce code generation (default)"
		USES_TERMINAL
	)

	# generate to build directory
	set(EKF_DERIVATION_DST_DIR ${CMAKE_CURRENT_BINARY_DIR}/ekf_derivation)
	file(MAKE_DIRECTORY ${EKF_DERIVATION_DST_DIR})

	set(EKF_GENERATED_FILES ${EKF_DERIVATION_DST_DIR}/generated/state.h)
	set(EKF_GENERATED_DERIVATION_INCLUDE_PATH ${CMAKE_CURRENT_BINARY_DIR})

	set(SYMFORCE_ARGS)

	if(NOT CONFIG_EKF2_MAGNETOMETER)
		message(STATUS "ekf2: symforce disabling mag")
		list(APPEND SYMFORCE_ARGS "--disable_mag")
	endif()

	if(NOT CONFIG_EKF2_WIND)
		message(STATUS "ekf2: symforce disabling wind")
		list(APPEND SYMFORCE_ARGS "--disable_wind")
	endif()

	add_custom_command(
		OUTPUT
			${EKF_DERIVATION_DST_DIR}/generated/predict_covariance.h
			${EKF_DERIVATION_DST_DIR}/generated/state.h
		COMMAND
			${PYTHON_EXECUTABLE} ${EKF_DERIVATION_SRC_DIR}/derivation.py ${SYMFORCE_ARGS}
		DEPENDS
			${EKF_DERIVATION_SRC_DIR}/derivation.py
			${EKF_DERIVATION_SRC_DIR}/derivation_utils.py

		WORKING_DIRECTORY ${EKF_DERIVATION_DST_DIR}
		COMMENT "Symforce code generation"
		USES_TERMINAL
	)



	add_custom_target(ekf2_symforce_generate
		DEPENDS
			${EKF_DERIVATION_SRC_DIR}/generated/predict_covariance.h
			${EKF_DERIVATION_DST_DIR}/generated/predict_covariance.h
	)
endif()

set(EKF_SRCS)
list(APPEND EKF_SRCS
	EKF/bias_estimator.cpp
	EKF/control.cpp
	EKF/covariance.cpp
	EKF/ekf.cpp
	EKF/ekf_helper.cpp
	EKF/EKFGSF_yaw.cpp
	EKF/estimator_interface.cpp
	EKF/fake_height_control.cpp
	EKF/fake_pos_control.cpp
	EKF/height_control.cpp
	EKF/imu_down_sampler.cpp
	EKF/output_predictor.cpp
	EKF/velocity_fusion.cpp
	EKF/position_fusion.cpp
	EKF/yaw_fusion.cpp
	EKF/zero_innovation_heading_update.cpp

	EKF/aid_sources/ZeroGyroUpdate.cpp
	EKF/aid_sources/ZeroVelocityUpdate.cpp
)

if(CONFIG_EKF2_AIRSPEED)
	list(APPEND EKF_SRCS EKF/airspeed_fusion.cpp)
endif()

if(CONFIG_EKF2_AUX_GLOBAL_POSITION)
	list(APPEND EKF_SRCS EKF/aux_global_position.cpp)
endif()

if(CONFIG_EKF2_AUXVEL)
	list(APPEND EKF_SRCS EKF/auxvel_fusion.cpp)
endif()

if(CONFIG_EKF2_BAROMETER)
	list(APPEND EKF_SRCS
		EKF/baro_height_control.cpp
	)
endif()

if(CONFIG_EKF2_DRAG_FUSION)
	list(APPEND EKF_SRCS EKF/drag_fusion.cpp)
endif()

if(CONFIG_EKF2_EXTERNAL_VISION)
	list(APPEND EKF_SRCS
		EKF/ev_control.cpp
		EKF/ev_height_control.cpp
		EKF/ev_pos_control.cpp
		EKF/ev_vel_control.cpp
		EKF/ev_yaw_control.cpp
	)
endif()

if(CONFIG_EKF2_GNSS)
	list(APPEND EKF_SRCS
		EKF/gnss_height_control.cpp
		EKF/gps_checks.cpp
		EKF/gps_control.cpp
	)
endif()

if(CONFIG_EKF2_GNSS_YAW)
	list(APPEND EKF_SRCS EKF/gps_yaw_fusion.cpp)
endif()

if(CONFIG_EKF2_GRAVITY_FUSION)
	list(APPEND EKF_SRCS EKF/gravity_fusion.cpp)
endif()

if(CONFIG_EKF2_MAGNETOMETER)
	list(APPEND EKF_SRCS
		EKF/mag_3d_control.cpp
		EKF/mag_control.cpp
		EKF/mag_fusion.cpp
		EKF/mag_heading_control.cpp
	)
endif()

if(CONFIG_EKF2_OPTICAL_FLOW)
	list(APPEND EKF_SRCS
		EKF/optical_flow_control.cpp
		EKF/optflow_fusion.cpp
	)
endif()

if(CONFIG_EKF2_RANGE_FINDER)
	list(APPEND EKF_SRCS
		EKF/range_finder_consistency_check.cpp
		EKF/range_height_control.cpp
		EKF/sensor_range_finder.cpp
	)
endif()

if(CONFIG_EKF2_SIDESLIP)
	list(APPEND EKF_SRCS EKF/sideslip_fusion.cpp)
endif()

if(CONFIG_EKF2_TERRAIN)
	list(APPEND EKF_SRCS EKF/terrain_estimator.cpp)
endif()

px4_add_module(
	MODULE modules__ekf2
	MAIN ekf2
	COMPILE_FLAGS
		${MAX_CUSTOM_OPT_LEVEL}
		-fno-associative-math
		#-DDEBUG_BUILD
		#-O0
		-Wno-double-promotion
		#-Wno-error
		# single precision literal?
	INCLUDES
		EKF
		EKF/aid_sources
		${EKF_GENERATED_DERIVATION_INCLUDE_PATH}
	PRIORITY
		"SCHED_PRIORITY_MAX - 18" # max priority below high priority WQ threads
	STACK_MAX
		3600
	SRCS
		${EKF_SRCS}

		EKF2.cpp
		EKF2.hpp
		EKF2Selector.cpp
		EKF2Selector.hpp

		${EKF_GENERATED_FILES}

	DEPENDS
		geo
		hysteresis
		perf
		EKF2Utility
		px4_work_queue
		world_magnetic_model
	UNITY_BUILD
	)

if(BUILD_TESTING)
	add_subdirectory(EKF)
	add_subdirectory(test)
endif()