find_package(Python COMPONENTS Interpreter)

set(sysroot_manifest ${CMAKE_CURRENT_BINARY_DIR}/sysroot-manifest.json)
set(sysroot_tool ${CMAKE_SOURCE_DIR}/util/sysroot-tool.py)

function(sysroot_reset)
	execute_process(
		COMMAND ${Python_EXECUTABLE} ${sysroot_tool} reset ${sysroot_manifest}
		COMMAND_ERROR_IS_FATAL ANY)
endfunction(sysroot_reset)

function(sysroot_set_base)
	set(options)
	set(one_value_args PATH)
	set(multi_value_args)

	cmake_parse_arguments(PARSE_ARGV 0 arg
		"${options}"
		"${one_value_args}"
		"${multi_value_args}")

	set(sysroot_target_name _sysroot-base)

	get_property(sysroot_targets GLOBAL PROPERTY sysroot_target_list)
	list(LENGTH sysroot_targets nr_sysroot_targets)
	if (${nr_sysroot_targets} GREATER 0)
		math(EXPR serialiser_index "${nr_sysroot_targets}-1")
		list(GET sysroot_targets ${serialiser_index} serialiser)
	endif ()

	add_custom_target(${sysroot_target_name}
		COMMAND	${Python_EXECUTABLE} ${sysroot_tool}
			set-base ${sysroot_manifest} ${arg_PATH}
		COMMENT "Preparing sysroot base"
		DEPENDS ${serialiser})

	set_property(GLOBAL PROPERTY sysroot_target_list ${sysroot_targets} ${sysroot_target_name})
endfunction(sysroot_set_base)

function(sysroot_add_library)
	set(options)
	set(one_value_args NAME HEADER_DIR LIB_DIR)
	set(multi_value_args)

	cmake_parse_arguments(PARSE_ARGV 0 arg
		"${options}"
		"${one_value_args}"
		"${multi_value_args}")

	set(target_name ${arg_NAME})
	set(sysroot_target_name _sysroot-${target_name})
	meta_target_get_header_directories(TARGET ${target_name} OUT header_dirs)

	get_property(sysroot_targets GLOBAL PROPERTY sysroot_target_list)
	list(LENGTH sysroot_targets nr_sysroot_targets)
	if (${nr_sysroot_targets} GREATER 0)
		math(EXPR serialiser_index "${nr_sysroot_targets}-1")
		list(GET sysroot_targets ${serialiser_index} serialiser)
	endif ()

	if (arg_HEADER_DIR)
		add_custom_target(${sysroot_target_name}
			COMMAND	${Python_EXECUTABLE} ${sysroot_tool}
				add-binary ${sysroot_manifest} ${target_name}
				${arg_LIB_DIR} $<TARGET_FILE:${target_name}>
			COMMAND ${Python_EXECUTABLE} ${sysroot_tool}
				add-headers ${sysroot_manifest} ${target_name}
				${arg_HEADER_DIR} ${header_dirs}
			COMMENT "Preparing sysroot component: ${target_name}"
			DEPENDS ${target_name} ${serialiser})
	else()
		add_custom_target(${sysroot_target_name}
			COMMAND	${Python_EXECUTABLE} ${sysroot_tool}
				add-binary ${sysroot_manifest} ${target_name}
				${arg_LIB_DIR} $<TARGET_FILE:${target_name}>
			COMMENT "Preparing sysroot component: ${target_name}"
			DEPENDS ${target_name} ${serialiser})
	endif ()

	set_property(GLOBAL PROPERTY sysroot_target_list ${sysroot_targets} ${sysroot_target_name})
endfunction(sysroot_add_library)

function(sysroot_add_object_library)
	set(options)
	set(one_value_args NAME HEADER_DIR LIB_DIR)
	set(multi_value_args)

	cmake_parse_arguments(PARSE_ARGV 0 arg
		"${options}"
		"${one_value_args}"
		"${multi_value_args}")

	set(target_name ${arg_NAME})
	set(sysroot_target_name _sysroot-${target_name})
	meta_target_get_header_directories(TARGET ${target_name} OUT header_dirs)

	get_property(sysroot_targets GLOBAL PROPERTY sysroot_target_list)
	list(LENGTH sysroot_targets nr_sysroot_targets)
	if (${nr_sysroot_targets} GREATER 0)
		math(EXPR serialiser_index "${nr_sysroot_targets}-1")
		list(GET sysroot_targets ${serialiser_index} serialiser)
	endif ()

	if (arg_HEADER_DIR)
		add_custom_target(${sysroot_target_name}
			COMMAND	${Python_EXECUTABLE} ${sysroot_tool}
				add-binary ${sysroot_manifest} ${target_name}
				${arg_LIB_DIR} $<TARGET_OBJECTS:${target_name}>
			COMMAND ${Python_EXECUTABLE} ${sysroot_tool}
				add-headers ${sysroot_manifest} ${target_name}
				${arg_HEADER_DIR} ${header_dirs}
			COMMENT "Preparing sysroot component: ${target_name}"
			DEPENDS ${target_name} ${serialiser})
	else()
		add_custom_target(${sysroot_target_name}
			COMMAND	${Python_EXECUTABLE} ${sysroot_tool}
				add-binary ${sysroot_manifest} ${target_name}
				${arg_LIB_DIR} $<TARGET_OBJECTS:${target_name}>
			COMMENT "Preparing sysroot component: ${target_name}"
			DEPENDS ${target_name} ${serialiser})
	endif ()

	get_property(tmp TARGET ${target_name} PROPERTY SUFFIX)

	set_property(GLOBAL PROPERTY sysroot_target_list ${sysroot_targets} ${sysroot_target_name})
endfunction(sysroot_add_object_library)

function(sysroot_add_program)
	set(options)
	set(one_value_args NAME BIN_DIR)
	set(multi_value_args)

	cmake_parse_arguments(PARSE_ARGV 0 arg
		"${options}"
		"${one_value_args}"
		"${multi_value_args}")

	set(target_name ${arg_NAME})
	set(sysroot_target_name _sysroot-${target_name})

	get_property(sysroot_targets GLOBAL PROPERTY sysroot_target_list)
	list(LENGTH sysroot_targets nr_sysroot_targets)
	if (${nr_sysroot_targets} GREATER 0)
		math(EXPR serialiser_index "${nr_sysroot_targets}-1")
		list(GET sysroot_targets ${serialiser_index} serialiser)
	endif ()

	add_custom_target(${sysroot_target_name}
		COMMAND	${Python_EXECUTABLE} ${sysroot_tool}
			add-binary ${sysroot_manifest} ${target_name}
			${arg_BIN_DIR} $<TARGET_FILE:${target_name}>
		COMMENT "Preparing sysroot component: ${target_name}"
		DEPENDS ${target_name} ${serialiser})

	set_property(GLOBAL PROPERTY sysroot_target_list ${sysroot_targets} ${sysroot_target_name})
endfunction(sysroot_add_program)

function(sysroot_add_file)
	set(options)
	set(one_value_args ID SRC_PATH DEST_DIR)
	set(multi_value_args DEPENDS)

	cmake_parse_arguments(PARSE_ARGV 0 arg
		"${options}"
		"${one_value_args}"
		"${multi_value_args}")

	set(src_path ${arg_SRC_PATH})
	set(dest_dir ${arg_DEST_DIR})
	set(sysroot_target_name _sysroot-${arg_ID})

	get_property(sysroot_targets GLOBAL PROPERTY sysroot_target_list)
	list(LENGTH sysroot_targets nr_sysroot_targets)
	if (${nr_sysroot_targets} GREATER 0)
		math(EXPR serialiser_index "${nr_sysroot_targets}-1")
		list(GET sysroot_targets ${serialiser_index} serialiser)
	endif ()

	add_custom_target(${sysroot_target_name}
		COMMAND	${Python_EXECUTABLE} ${sysroot_tool}
			add-binary ${sysroot_manifest} ${arg_ID}
			${dest_dir} ${src_path}
		COMMENT "Preparing sysroot component: ${arg_ID}"
		DEPENDS ${target_name} ${serialiser} ${arg_DEPENDS})

	set_property(GLOBAL PROPERTY sysroot_target_list ${sysroot_targets} ${sysroot_target_name})
endfunction(sysroot_add_file)


function(sysroot_finalise)
	get_property(sysroot_targets GLOBAL PROPERTY sysroot_target_list)
	add_custom_target(sysroot
		COMMAND	${Python_EXECUTABLE} ${sysroot_tool}
			build-sysroot ${sysroot_manifest} ${CMAKE_BINARY_DIR}/sysroot
		DEPENDS ${sysroot_targets}
		COMMENT "Building sysroot...")
endfunction(sysroot_finalise)