cmake_minimum_required(VERSION 3.21)

project(CoopAllTheThings
	VERSION 0.0.1
	DESCRIPTION "Steam Remote Play Together for any XInput game"
	LANGUAGES CXX)

if(NOT WIN32)
	message(FATAL_ERROR "CoopAllTheThings targets Windows only.")
endif()

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# Emit compile_commands.json so clangd resolves includes/flags. Ignored by the
# Visual Studio generator, so configure the Ninja build (build-clangd/) for this;
# .clangd points clangd at that compilation database.
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# Single output dir keeps the donor-launch / inject workflow simple: host exe and
# hook dll land next to each other under /bin (already in .gitignore).
set(COOP_OUTPUT_DIR "${CMAKE_SOURCE_DIR}/bin/$<CONFIG>")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${COOP_OUTPUT_DIR}")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${COOP_OUTPUT_DIR}")

if(MSVC)
	add_compile_options(/W4 /permissive- /Zc:__cplusplus /utf-8 /MP)
	add_compile_definitions(UNICODE _UNICODE WIN32_LEAN_AND_MEAN NOMINMAX)
endif()

# --- x86 sub-build (internal, re-entrant) ----------------------------------
# When the ExternalProject below reconfigures this same tree with -A Win32 and
# -DCOOP_X86_HELPER_BUILD=ON, build ONLY the 32-bit hook DLL + injector helper
# (staged alongside the x64 binaries) and stop -- no host, tests, or imgui, and
# crucially no recursive ExternalProject.
option(COOP_X86_HELPER_BUILD "Internal: x86 sub-build (hook DLL + injector helper only)" OFF)
if(COOP_X86_HELPER_BUILD)
	add_subdirectory(common)
	set(SAFETYHOOK_BUILD_TEST OFF CACHE BOOL "" FORCE)
	set(SAFETYHOOK_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
	set(SAFETYHOOK_BUILD_DOCS OFF CACHE BOOL "" FORCE)
	add_subdirectory(third_party/safetyhook)
	add_subdirectory(hook)
	add_subdirectory(tools/inject_helper)
	return()
endif()

add_subdirectory(third_party)
add_subdirectory(common)
add_subdirectory(host)

# The injected hook DLL pulls in SafetyHook, which fetches Zydis via FetchContent
# at configure time (allowed for transitive deps).
option(COOP_BUILD_HOOK "Build the injected game-side hook DLL" ON)
if(COOP_BUILD_HOOK)
	# SafetyHook's own tests/examples/docs are noise for us.
	set(SAFETYHOOK_BUILD_TEST OFF CACHE BOOL "" FORCE)
	set(SAFETYHOOK_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
	set(SAFETYHOOK_BUILD_DOCS OFF CACHE BOOL "" FORCE)
	add_subdirectory(third_party/safetyhook)
	add_subdirectory(hook)
	enable_testing()
	add_subdirectory(tools/audio_tone)  # coop_tone: audio source for the loopback test
	add_subdirectory(tools/audio_probe) # coop_audio_probe: inject + diagnose the render-hook
	add_subdirectory(tests)
endif()

# --- x86 helper artifacts for 32-bit (WOW64) games -------------------------
# A 64-bit process can't cleanly inject a 32-bit one, so build the x86 hook DLL
# (coop_hook_x86.dll) + a 32-bit injector helper (coop_inject_x86.exe) via a
# nested Win32 configure of this same tree, staged next to the x64 binaries. Only
# the multi-config Visual Studio generator is supported here (the Ninja
# build-clangd/ tree is just for compile_commands and skips this).
option(COOP_BUILD_X86_HELPER "Build the x86 hook DLL + injector helper for 32-bit games" ON)
if(COOP_BUILD_HOOK AND COOP_BUILD_X86_HELPER AND CMAKE_GENERATOR MATCHES "Visual Studio")
	include(ExternalProject)
	ExternalProject_Add(coop_x86
		SOURCE_DIR "${CMAKE_SOURCE_DIR}"
		BINARY_DIR "${CMAKE_BINARY_DIR}/x86"
		CMAKE_GENERATOR "${CMAKE_GENERATOR}"
		CMAKE_GENERATOR_PLATFORM "Win32"
		CMAKE_ARGS "-DCOOP_X86_HELPER_BUILD=ON"
		BUILD_COMMAND "${CMAKE_COMMAND}" --build <BINARY_DIR> --config $<CONFIG>
		INSTALL_COMMAND ""
		BUILD_ALWAYS ON
		USES_TERMINAL_CONFIGURE ON
		USES_TERMINAL_BUILD ON)
endif()