cmake_minimum_required(VERSION 3.24)

# Set build conditions, prevent in-source builds, check cmake policies @{
if (CMAKE_BINARY_DIR STREQUAL CMAKE_SOURCE_DIR)
    message(FATAL_ERROR "Source and build directories cannot be the same.")
endif()

if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.24.0")
	cmake_policy(SET CMP0135 NEW)
endif()

# When this package is included as a subproject, there's no need to
# build and run the unit-tests. setting -D ENABLE_TESTS to false could
# speed up build time for pacakge maintainers
if (NOT DEFINED PROJECT_NAME)
	option(ENABLE_TESTS "Build and run unit tests" ON)
else()
	option(ENABLE_TESTS "Build and run unit tests" OFF)
endif()

# @}
# @{ Define build options and build defaults
if (UNIX AND NOT(CMAKE_HOST_SYSTEM_NAME STREQUAL "Linux"))
	option(USE_BOOST_STACKTRACE "Use Boost::stacktrace for stack traces" OFF)
	option(USE_EXECINFO_STACKTRACE "Use BSD/UNIX execinfo for stack traces" ON)
else()
	option(USE_BOOST_STACKTRACE "Use Boost::stacktrace for stack traces" ON)
	option(USE_EXECINFO_STACKTRACE "Use BSD/UNIX execinfo for stack traces" OFF)
endif()
# @}

project(ElementalEngine
	VERSION 0.1
	LANGUAGES C CXX
	# HOMEPAGE_URL
	DESCRIPTION "[WIP] Simple game written in C++ and Javascript"
)

IF(NOT CMAKE_BUILD_TYPE)
	SET( CMAKE_BUILD_TYPE Debug )
ENDIF()

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_C_STANDARD 17)
set(CMAKE_C_EXTENSIONS OFF)
set(CMAKE_CXX_EXTENSIONS OFF)

# @{ Nice-to-haves, ccache and compile_commands.json for clangd
find_program(CCACHE_PATH ccache)
if(CCACHE_PATH)
    set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ${CCACHE_PATH})
    set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ${CCACHE_PATH})
endif(CCACHE_PATH)

set(CMAKE_EXPORT_COMPILE_COMMANDS On)
# @}

# @{ Dependency management
include(FetchContent)
include(CheckIncludeFile)

find_package(Threads REQUIRED)
find_package(PkgConfig REQUIRED)
#pkg_check_modules(CATCH2 "catch2-with-main >= 2.13.7")
pkg_check_modules(SDL2 "sdl2 >= 2" REQUIRED)
pkg_check_modules(SDL2_IMG "SDL2_image >= 0.29.0" REQUIRED)
pkg_check_modules(SDL2_GFX "SDL2_gfx >= 1.0.2" REQUIRED)
pkg_check_modules(NLOHMANN_JSON "nlohmann_json >= 3.11.2" REQUIRED)

message(CHECK_START "Detecting system Catch2 installation")
find_package(Catch2 3 QUIET)

if(TARGET Catch2::Catch2)
	message(CHECK_PASS "found")
	set(USE_SYSTEM_CATCH2 ON)
else()
	message(CHECK_FAIL "not found")
endif()

if (SDL2_FOUND)
	include_directories(${SDL2_INCLUDE_DIRS})
	link_directories(AFTER ${SDL2_IMG_LIBRARY_DIRS})
endif()
if (SDL2_IMG_FOUND)
	include_directories(${SDL2_IMG_INCLUDE_DIRS})
	link_directories(AFTER ${SDL2_LIBRARY_DIRS})
endif()
if (SDL2_GFX_FOUND)
	include_directories(${SDL2_GFX_INCLUDE_DIRS})
	link_directories(AFTER ${SDL2_GFX_LIBRARY_DIRS})
endif()
if (NLOHMANN_JSON_FOUND)
	include_directories(${NLOHMANN_JSON_INCLUDE_DIRS})

	#add_link_options(${NKLOHMANN_JSON_LDFLAGS})
endif()

# @{ Download and build unit test engine only if needed
if(ENABLE_TESTS AND NOT USE_SYSTEM_CATCH2)
	FetchContent_Declare(
		Catch2
		URL https://github.com/catchorg/Catch2/archive/refs/tags/v3.4.0.zip
		URL_HASH MD5=c426e77d4ee0055410bc930182959ae5
		FIND_PACKAGE_ARGS
	)

	FetchContent_MakeAvailable(Catch2)
	if (TARGET Catch2)
		set_target_properties(Catch2 PROPERTIES CXX_STANDARD 20)
	endif()

	if (TARGET Catch2WithMain)
		set_target_properties(Catch2WithMain PROPERTIES CXX_STANDARD 20)
	endif()
	list(APPEND CMAKE_MODULE_PATH ${Catch2_SOURCE_DIR}/extras)
elseif(ENABLE_TESTS AND USE_SYSTEM_CATCH2)
	include_directories(${CATCH2_INCLUDE_DIRS})
	link_directories(${CATCH2_LIBRARY_DIRS})
endif()

if (ENABLE_TESTS)
	FetchContent_Declare(
		FakeIt
		URL https://github.com/eranpeer/FakeIt/archive/refs/tags/2.4.0.zip
		URL_HASH MD5=72e4ce7f1c0de97074d2d5b517753286
		FIND_PACKAGE_ARGS
	)

	FetchContent_MakeAvailable(FakeIt)

endif()
# @}
# @{ Boost-Specific Options
if(USE_BOOST_STACKTRACE)
	set(Boost_USE_STATIC_LIBS OFF)
	set(Boost_USE_STATIC_RUNTIME OFF)  # Do not require static C++ runtime
	set(Boost_USE_MULTITHREADED ON)
	find_package(Boost 1.82.0 COMPONENTS system filesystem REQUIRED)

	if (Boost_FOUND)
		add_definitions(-DUSE_BOOST_STACKTRACER=1)
		add_definitions(-DBOOST_STACKTRACE_USE_ADDR2LINE=1)
		include_directories(${Boost_INCLUDE_DIRS})
	endif()
endif()
#@}
#@{ QT5 Dependency detection & tool setup
find_package(Qt6
	COMPONENTS
	Core REQUIRED
       	Widgets REQUIRED
	Gui REQUIRED
)
#@}

#@}

add_custom_target(copy_assets
	COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_LIST_DIR}/res ${CMAKE_BINARY_DIR}/build/share/
	COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_LIST_DIR}/res ${CMAKE_BINARY_DIR}/tests/res
)

if (USE_EXECINFO_STACKTRACE)
	CHECK_INCLUDE_FILE("execinfo.h" HAVE_EXECINFO_H)

	if (HAVE_EXECINFO_H)
		add_definitions(-DHAVE_EXECINFO_H=1)
	endif()

	find_library(LIB_EXEC_INFO
		NAMES execinfo  # Specify the library name without the 'lib' prefix or file extension
		HINTS /usr/lib /usr/local/lib  # Optional hint for the library location
	)
	if (LIB_EXEC_INFO)
		message(STATUS "Found libexecinfo: ${LIB_EXEC_INFO}")
		set(STACKTRACE_DEP_LIBS ${LIB_EXEC_INFO})
	endif()
endif()

include_directories(
	${CMAKE_SOURCE_DIR}
	${CMAKE_SOURCE_DIR}/src
	#${CMAKE_SOURCE_DIR}/include
	#${CMAKE_SOURCE_DIR}/include/private
)

set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/build/lib)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/build/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/build/bin)

if(CMAKE_BUILD_TYPE STREQUAL "Debug")
	set(custom_dbg_flags "-O0 -ggdb")

    	# Custom flags for Debug configuration
    	set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${custom_dbg_flags}")
    	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${custom_dbg_flags}")

elseif(CMAKE_BUILD_TYPE STREQUAL "Release")
	set(custom_rel_flags "-Os")

	set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${custom_rel_flags}")
	set(CMAKE_CXX_FLAGS_RELEASE
	    "${CMAKE_CXX_FLAGS_RELEASE} ${custom_rel_flags}"
	)
endif()

add_subdirectory(src)
#add_subdirectory(apps)

# vim:set noet sts=0 sw=8 ts=8 foldmethod=marker foldmarker=@{,@}: