cmake_minimum_required(VERSION 3.20)  # For using CMAKE_<LANG>_BYTE_ORDER

# set default cmake build type to Debug (None Debug Release RelWithDebInfo MinSizeRel)
if(NOT CMAKE_BUILD_TYPE AND NOT DEFINED ENV{CMAKE_BUILD_TYPE})
  set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "default build type")
endif()

option(BUILD_TESTING "Enable testing. Requires GTest." OFF)
option(ENABLE_LOGGER "Enable logging to the terminal" OFF)
option(ENABLE_MEM_RTL "Enable Real-time library memory management functions (disable to verbose memory allocations)" ON)
option(FATAL_GL_ERRORS "Check OpenGL calls and raise exceptions on errors." OFF)
option(FORCE_COLORED_OUTPUT "Always produce ANSI-colored compiler warnings/errors (GCC/Clang only; esp. useful with Ninja)." OFF)
option(FORCE_PORTABLE_INSTALL "Install all files into local directory defined by CMAKE_INSTALL_PREFIX" ON)
set(USE_VCPKG "DEFAULT" CACHE STRING "Use vcpkg for dependency management. DEFAULT defers to existence of $VCPKG_ROOT environment variable.")
set_property(CACHE USE_VCPKG PROPERTY STRINGS "DEFAULT" "ON" "OFF")

if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
  option(BUILD_EDITOR "Build internal editor" OFF)
endif()

if(USE_VCPKG)
  if(DEFINED ENV{VCPKG_ROOT})
    if (CMAKE_TOOLCHAIN_FILE)
      cmake_path(ABSOLUTE_PATH CMAKE_TOOLCHAIN_FILE NORMALIZE OUTPUT_VARIABLE VCPKG_CHAINLOAD_TOOLCHAIN_FILE)
    endif()

    set(VCPKG_TOOLCHAIN_FILE "scripts/buildsystems/vcpkg.cmake")
    cmake_path(ABSOLUTE_PATH VCPKG_TOOLCHAIN_FILE BASE_DIRECTORY $ENV{VCPKG_ROOT} NORMALIZE OUTPUT_VARIABLE CMAKE_TOOLCHAIN_FILE)

    if(CMAKE_TOOLCHAIN_FILE STREQUAL VCPKG_CHAINLOAD_TOOLCHAIN_FILE)
      # prevent endless recursion
      unset(VCPKG_CHAINLOAD_TOOLCHAIN_FILE)
    endif()
  elseif(NOT USE_VCPKG STREQUAL "DEFAULT")
    message(WARNING "USE_VCPKG=${USE_VCPKG} but ENV{VCPKG_ROOT} not set; will use system-provided libraries. Did you forget to set VCPKG_ROOT in your environment?")
  endif()
endif()

project(Descent3
  LANGUAGES C CXX
  VERSION 1.6.0
)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

set_property(GLOBAL PROPERTY USE_FOLDERS ON)

if(MSVC)
  add_compile_options(/source-charset:UTF-8 /execution-charset:UTF-8)
else()
  add_compile_options(-finput-charset=UTF-8)
  # Unfortunately, Clang doesn’t support -fexec-charset yet so this next part
  # is GCC only. Luckily, Clang defaults to using UTF-8 for the execution
  # character set [1], so we’re fine. Once Clang gets support for
  # -fexec-charset, we should probably start using it.
  #
  # [1]: <https://discourse.llvm.org/t/rfc-enabling-fexec-charset-support-to-llvm-and-clang-reposting/71512>
  if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    add_compile_options(-fexec-charset=UTF-8)
  endif()
endif()

if(FORCE_COLORED_OUTPUT)
  if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.24)
    set(CMAKE_COLOR_DIAGNOSTICS ON)
  else()
    if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
      add_compile_options(-fdiagnostics-color=always)
    elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
      add_compile_options(-fcolor-diagnostics)
    endif()
  endif()
endif()

include(GNUInstallDirs)
if(FORCE_PORTABLE_INSTALL)
  set(CMAKE_INSTALL_BINDIR ".")
  set(CMAKE_INSTALL_LIBDIR ".")
  set(CMAKE_INSTALL_DATADIR ".")
  set(CMAKE_INSTALL_DOCDIR ".")
endif()

if (CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
  set(CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}/installed" CACHE PATH "Default install path" FORCE)
endif()

if(CMAKE_CXX_BYTE_ORDER STREQUAL "BIG_ENDIAN")
  message(STATUS "Big Endian system detected.")
  add_compile_definitions("OUTRAGE_BIG_ENDIAN")
endif()


# 64 bit machines have a different game checksum than 32 bit machines
if (CMAKE_SIZEOF_VOID_P EQUAL 8)
  add_definitions(-DCHECKSUM=2273889835UL)
else()
  add_definitions(-DCHECKSUM=2273873307UL)
endif()

if(BUILD_TESTING)
  find_package(GTest REQUIRED)
  enable_testing()
  include(GoogleTest)
  add_subdirectory(tests)
endif()

# rebuild d3_version.h every time
add_custom_target(get_git_hash ALL)

add_custom_command(
  TARGET get_git_hash
  COMMAND ${CMAKE_COMMAND}
    -D SOURCE_DIR=${PROJECT_SOURCE_DIR}
    -D TARGET_DIR=${PROJECT_BINARY_DIR}
    -D PROJECT_VERSION_MAJOR=${PROJECT_VERSION_MAJOR}
    -D PROJECT_VERSION_MINOR=${PROJECT_VERSION_MINOR}
    -D PROJECT_VERSION_PATCH=${PROJECT_VERSION_PATCH}
    -P ${PROJECT_SOURCE_DIR}/cmake/CheckGit.cmake
  WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
)

install(
  FILES CHANGELOG.md USAGE.md README.md BUILD.md LICENSE THIRD_PARTY.md
  DESTINATION ${CMAKE_INSTALL_DOCDIR}
)

if(CMAKE_CXX_COMPILER_ID MATCHES "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
  add_compile_options("-Wno-multichar;-Wall")
endif()

find_package(glm REQUIRED)
find_package(SDL2 REQUIRED)
# Some versions of the SDL2 find_package set SDL2_INCLUDE_DIR and some set a plural SDL2_INCLUDE_DIRS. Check both.
message("SDL2 Include Dir is ${SDL2_INCLUDE_DIR} ${SDL2_INCLUDE_DIRS}")


if(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
  message("Building for Linux")
  add_compile_definitions(POSIX __LINUX__ _USE_OGL_ACTIVE_TEXTURES PRIMARY_HOG=\"d3-linux.hog\")
  set(PLATFORM_INCLUDES "lib/linux" ${SDL2_INCLUDE_DIR} ${SDL2_INCLUDE_DIRS})
elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
  message("Building for MAC OSX")
  add_compile_definitions(POSIX MACOSX=1 _USE_OGL_ACTIVE_TEXTURES PRIMARY_HOG=\"d3-osx.hog\")
  set(PLATFORM_INCLUDES "lib/linux" ${SDL2_INCLUDE_DIR} ${SDL2_INCLUDE_DIRS})
elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
  # Windows.h defines to avoid as many issues as possible.
  add_compile_definitions(WIN32_LEAN_AND_MEAN NOMINMAX NODRAWTEXT NOBITMAP NOMCX NOSERVICE PRIMARY_HOG=\"d3-win.hog\"
          #[[NOGDI]] # We need GDI for now, enable when GDI is actually not needed (or when all windows.h mentions are gone)
  )

  list(APPEND CMAKE_LIBRARY_PATH "lib/win" "lib/win/DirectX/${CMAKE_CXX_COMPILER_ARCHITECTURE_ID}")
  add_compile_options("$<$<AND:$<CONFIG:Debug>,$<COMPILE_LANGUAGE:CXX>>:/EHsc;/RTC1;/W3;/nologo;/c;/Zi;/TP;/errorReport:prompt>")
  add_compile_options("$<$<AND:$<CONFIG:Release>,$<COMPILE_LANGUAGE:CXX>>:/GL;/FD;/EHsc;/W3;/nologo;/c;/Zi;/TP;/errorReport:prompt>")

  add_link_options("/SAFESEH:NO;/NODEFAULTLIB:LIBC")
  add_link_options("$<$<CONFIG:Release>:/LTCG>")

  add_compile_definitions(WIN32 _CRT_SECURE_NO_WARNINGS _CRT_SECURE_NO_DEPRECATE _CRT_NONSTDC_NO_DEPRECATE)

  set(PLATFORM_INCLUDES "lib/win/DirectX" "lib/win")

  set(CMAKE_FIND_LIBRARY_PREFIXES "")
  set(CMAKE_FIND_LIBRARY_SUFFIXES ".lib")

  add_compile_definitions(DIRECTINPUT_VERSION=0x0500)
  find_library(DSOUND_LIBRARY NAMES dsound REQUIRED)
  find_library(DINPUT_LIBRARY NAMES dinput REQUIRED)
  find_library(DXGUID_LIBRARY NAMES dxguid REQUIRED)
  find_library(DDRAW_LIBRARY NAMES ddraw REQUIRED)

  if(MSVC AND CMAKE_CXX_SIMULATE_ID STREQUAL "")
    add_compile_options("/we4150")  # deletion of pointer to incomplete type 'type'; no destructor called
#    add_compile_options("/we4305")  # truncation from 'X' to 'Y'
    add_compile_options("/we4474")  # too many arguments passed for format string
    add_compile_options("/we4700")  # uninitialized local variable 'X' used
    add_compile_options("/we4804")  # unsafe use of type 'bool' in operation
    add_compile_options("/we4806")  # unsafe operation: no value of type 'bool' promoted to type 'int' can equal the given constant
    add_compile_options("/we4473")  # not enough arguments passed for format string
    add_compile_options("/we4477")  # format string requires argument of type X but variadic argument Y has type Z
    add_compile_options("/we4715")  # 'function' : not all control paths return a value
    add_compile_options("/we4834")  # discarding return value of function with [[nodiscard]] attribute
  endif()

  add_compile_options("/MP")  # so msbuild builds with multiple processes
endif()

add_compile_definitions($<$<CONFIG:Release>:RELEASE>)
add_compile_definitions($<$<CONFIG:Debug>:_DEBUG>)

find_package(ZLIB REQUIRED)

if(ENABLE_LOGGER)
  message("Enabling Logging")
  add_compile_definitions(LOGGER)
endif()

if(FATAL_GL_ERRORS)
  message("Raising exceptions on OpenGL errors")
  add_compile_definitions(FATAL_GL_ERRORS)
endif()

include_directories(
  "cfile"   # TODO: Remove after untying all modules
  "ddebug"  # -*-
  "fix"     # -*-
  "lib"     # TODO: Remove after untying all modules
  "linux"   # -*-
  "Descent3"
  ${PLATFORM_INCLUDES}
)

add_subdirectory(third_party)

add_subdirectory(2dlib)
add_subdirectory(AudioEncode)
add_subdirectory(bitmap)
add_subdirectory(cfile)
add_subdirectory(ddebug)

if(BUILD_EDITOR AND CMAKE_SYSTEM_NAME STREQUAL "Windows")
  add_subdirectory(dd_grwin32)
  add_subdirectory(win32)
endif()

add_subdirectory(linux)

add_subdirectory(ddio)
add_subdirectory(dd_video)
add_subdirectory(fix)
add_subdirectory(manage)
add_subdirectory(grtext)
add_subdirectory(mem)
add_subdirectory(misc)
add_subdirectory(model)
add_subdirectory(module)
add_subdirectory(music)
add_subdirectory(networking)
add_subdirectory(physics)
add_subdirectory(renderer)
add_subdirectory(rtperformance)
add_subdirectory(sndlib)
add_subdirectory(stream_audio)
add_subdirectory(ui)
add_subdirectory(unzip)
add_subdirectory(vecmat)
add_subdirectory(libmve)
add_subdirectory(md5)

if(BUILD_EDITOR AND CMAKE_SYSTEM_NAME STREQUAL "Windows")
  add_subdirectory(editor)
endif()

add_subdirectory(Descent3)

add_subdirectory(tools)
add_subdirectory(netcon)
add_subdirectory(netgames)
add_subdirectory(scripts)

# Packaging stuff
set(CPACK_SOURCE_GENERATOR "TXZ")
set(CPACK_SOURCE_IGNORE_FILES
  ".git/"
  ".github/"
  ".idea"
  build[s]/
  cmake-build-*
  ".*~$"
)
set(CPACK_VERBATIM_VARIABLES YES)
include(CPack)