#
# CMakeLists.txt -- CMake build system for malikania
#
# Copyright (c) 2013-2016 Malikania Authors
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#

include(CMakeParseArguments)

# ---------------------------------------------------------
# The following macros are available:
#
# malikania_define_executable
# ---------------------------
#
# malikania_define_executable(
#	TARGET			The target name
#	SOURCES			The list of sources
#	FLAGS			(Optional) List of flags
#	INCLUDES		(Optional) List of include directories
#	LIBRARIES		(Optional) List of libraries
# )
#
# Create an executable. Be sure to quote SOURCES, if not only the first file will be passed.
# If you need flags, just pass them without -D or /D, this is automatically done for you.
#
# malikania_create_library
# ------------------------
#
# malikania_create_library(
#	TARGET			The target name
#	SOURCES			The sources
#	FLAGS			(Optional) List of flags
#	PRIVATE_INCLUDES	(Optional) List of includes only for building the library
#	PUBLIC_INCLUDES		(Optional) List of public includes to share with the library users
#	LIBRARIES		(Optional) List of libraries to link against
# )
#
# Create a shared library. Follow the same specification as malikania_define_executable.
# However, additional PRIVATE_INCLUDES and PUBLIC_INCLUDES are available.
#
# malikania_create_test
# ---------------------
#
# malikania_create_test(
#	NAME			Test name (must be lowercase)
#	SOURCES			Test sources files
#	LIBRARIES		(Optional) Libraries to link to
#	RESOURCES		(Optional) Resources files to copy verbatim
# )
#
# This will generate a target named test-<name> where name is the parameter NAME. The test is created
# under CMAKE_BINARY_DIR/test/<NAME> and resources are copied there with the same hierarchy.
#
# setg
# ----
#
# setg(var value)
#
# Set a cache variable internal with name var.
#
# ---------------------------------------------------------

function(apply_flags target flags)
	# Add MALIKANIA_BUILD to enable declspec(dllexport) on Windows
	if (${flags})
		target_compile_definitions(
			${target}
			PRIVATE ${flags}
			PRIVATE "MALIKANIA_BUILD"
		)
	endif ()
endfunction()

function(apply_public_includes target var)
	if (${var})
		target_include_directories(${target} PUBLIC ${${var}})
	endif ()

	target_include_directories(
		${target}
		PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/malikania/${WITH_BACKEND_DIRECTORY}
		PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}
	)
endfunction()

function(apply_private_includes target var)
	if (${var})
		target_include_directories(${target} PRIVATE ${${var}})
	endif ()
endfunction()

function(apply_includes target var)
	if (${var})
		target_include_directories(${target} PRIVATE ${${var}})
	endif ()
endfunction()

function(apply_libraries target libs)
	if (${libs})
		target_link_libraries(${target} ${${libs}})
	endif ()
endfunction()

function(check_args prefix list)
	foreach (e ${list})
		if (NOT ${prefix}_${e})
			message(FATAL_ERROR "Please set `${e}' parameter")
		endif ()
	endforeach ()
endfunction()

function(malikania_define_executable)
	set(singleArgs TARGET)
	set(multiArgs SOURCES FLAGS INCLUDES LIBRARIES)
	set(mandatory TARGET SOURCES)

	cmake_parse_arguments(EXE "" "${singleArgs}" "${multiArgs}" ${ARGN})
	check_args(EXE ${mandatory})

	add_executable(${EXE_TARGET} ${EXE_SOURCES})

	apply_libraries(${EXE_TARGET} EXE_LIBRARIES)
	apply_includes(${EXE_TARGET} EXE_INCLUDES)
	apply_flags(${EXE_TARGET} EXE_FLAGS)
endfunction()

function(malikania_create_library)
	set(singleArgs TARGET)
	set(multiArgs SOURCES FLAGS PRIVATE_INCLUDES PUBLIC_INCLUDES LIBRARIES)
	set(mandatory TARGET SOURCES)

	cmake_parse_arguments(LIB "" "${singleArgs}" "${multiArgs}" ${ARGN})
	check_args(LIB ${mandatory})

	add_library(${LIB_TARGET} SHARED ${LIB_SOURCES})

	# Remove lib suffix to avoid conflict with client and libclient targets
	set_target_properties(
		${LIB_TARGET}
		PROPERTIES
		PREFIX ""
	)

	list(APPEND LIB_LIBRARIES duktape)

	apply_libraries(${LIB_TARGET} LIB_LIBRARIES)
	apply_private_includes(${LIB_TARGET} LIB_PRIVATE_INCLUDES)
	apply_public_includes(${LIB_TARGET} LIB_PUBLIC_INCLUDES)
	apply_flags(${LIB_TARGET} LIB_FLAGS)
endfunction()

function(malikania_create_test)
	set(singleArgs NAME)
	set(multiArgs LIBRARIES SOURCES RESOURCES)

	set(mandatory NAME SOURCES)

	cmake_parse_arguments(TEST "" "${singleArgs}" "${multiArgs}" ${ARGN})
	check_args(TEST ${mandatory})

	file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/test/${TEST_NAME})

	if (UNIX)
		list(APPEND TEST_LIBRARIES pthread)
	endif ()

	# Resources files added before as custom output
	foreach (f ${TEST_RESOURCES})
		get_filename_component(absolute ${f} ABSOLUTE)
		file(RELATIVE_PATH basename ${CMAKE_CURRENT_SOURCE_DIR} ${absolute})
		set(output ${CMAKE_BINARY_DIR}/test/${TEST_NAME}/${basename})

		add_custom_command(
			OUTPUT ${output}
			COMMAND ${CMAKE_COMMAND} -E copy ${absolute} ${output}
			DEPENDS ${absolute}
		)

		list(APPEND TEST_SOURCES ${absolute})
		list(APPEND outputs ${output})
	endforeach ()

	add_executable(test-${TEST_NAME} ${TEST_SOURCES} ${outputs})
	source_group(private\\Resources FILES ${outputs})
	target_compile_definitions(test-${TEST_NAME} PRIVATE SOURCE_DIRECTORY=\"${CMAKE_BINARY_DIR}/test/${TEST_NAME}\")
	set_target_properties(
		test-${TEST_NAME}
		PROPERTIES
			RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/test/${TEST_NAME}
			RUNTIME_OUTPUT_DIRECTORY_DEBUG ${CMAKE_BINARY_DIR}/test/${TEST_NAME}
			RUNTIME_OUTPUT_DIRECTORY_RELEASE ${CMAKE_BINARY_DIR}/test/${TEST_NAME}
			RUNTIME_OUTPUT_DIRECTORY_RELWITHDEBINFO ${CMAKE_BINARY_DIR}/test/${TEST_NAME}
			RUNTIME_OUTPUT_DIRECTORY_MINSIZEREL ${CMAKE_BINARY_DIR}/test/${TEST_NAME}
	)
	add_test(
		NAME ${TEST_NAME}
		COMMAND $<TARGET_FILE:test-${TEST_NAME}>
		WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/test/${TEST_NAME}
	)

	target_link_libraries(
		test-${TEST_NAME}
		${TEST_LIBRARIES}
		gtest
	)

	add_dependencies(tests test-${TEST_NAME})
endfunction()

macro(setg var value)
	set(${var} ${value} CACHE INTERNAL "" FORCE)
endmacro()