# CMake File for VVVVVV
# Written by Ethan "flibitijibibo" Lee

cmake_minimum_required(VERSION 2.8.12)

# CMake Options
option(ENABLE_WARNINGS "Enable compilation warnings" ON)
option(ENABLE_WERROR "Treat compilation warnings as errors" OFF)

option(BUNDLE_DEPENDENCIES "Use bundled TinyXML-2, PhysicsFS, FAudio, and UTF8-CPP (if disabled, TinyXML-2, PhysicsFS, and FAudio will be dynamically linked, LodePNG, UTF8-CPP and C-HashMap will still be statically linked)" ON)

set(CUSTOM_LEVEL_SUPPORT ENABLED CACHE STRING "Optionally disable playing and/or editing of custom levels")
set_property(CACHE CUSTOM_LEVEL_SUPPORT PROPERTY STRINGS ENABLED NO_EDITOR DISABLED)

option(STEAM "Use the Steam API" OFF)
option(GOG "Use the GOG API" OFF)

option(OFFICIAL_BUILD "Compile an official build of the game" OFF)

option(MAKEANDPLAY "Compile a version of the game without the main campaign (provided for convenience; consider modifying MakeAndPlay.h instead" OFF)

if(OFFICIAL_BUILD AND NOT MAKEANDPLAY)
    set(STEAM ON)
    set(GOG ON)
endif()

option(REMOVE_ABSOLUTE_PATHS "If supported by the compiler, replace all absolute paths to source directories compiled into the binary (if any) with relative paths" ON)


# Architecture Flags
if(APPLE)
    # Wow, Apple is a huge jerk these days huh?
    set(OSX_10_9_SDK_PATH /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk)
    if(NOT CMAKE_OSX_SYSROOT)
        if(IS_DIRECTORY ${OSX_10_9_SDK_PATH})
            set(CMAKE_OSX_SYSROOT ${OSX_10_9_SDK_PATH})
        else()
            message(WARNING "CMAKE_OSX_SYSROOT not set and macOS 10.9 SDK not found! Using default one.")
        endif()
    endif()
    set(CMAKE_OSX_DEPLOYMENT_TARGET 10.9)
    link_directories(/usr/local/lib)
    add_compile_options(-Werror=partial-availability)
endif()

project(VVVVVV)

if(APPLE)
    message(STATUS "Using macOS SDK at ${CMAKE_OSX_SYSROOT}")
endif()

# RPATH
if(NOT WIN32)
    if(APPLE)
        set(BIN_LIBROOT "osx")
        set(BIN_RPATH "@executable_path/osx")
    elseif(CMAKE_SIZEOF_VOID_P MATCHES "8")
        set(BIN_LIBROOT "lib64")
        set(BIN_RPATH "\$ORIGIN/lib64")
    else()
        set(BIN_LIBROOT "lib")
        set(BIN_RPATH "\$ORIGIN/lib")
    endif()
    set(CMAKE_SKIP_BUILD_RPATH TRUE)
    set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
    set(CMAKE_INSTALL_RPATH ${BIN_RPATH})
    set(CMAKE_INSTALL_RPATH_USE_LINK_PATH FALSE)
endif()

# Source Lists
set(VVV_SRC
    src/BinaryBlob.cpp
    src/BlockV.cpp
    src/CWrappers.cpp
    src/Ent.cpp
    src/Entity.cpp
    src/FileSystemUtils.cpp
    src/Finalclass.cpp
    src/Font.cpp
    src/Game.cpp
    src/Graphics.cpp
    src/GraphicsResources.cpp
    src/GraphicsUtil.cpp
    src/Input.cpp
    src/KeyPoll.cpp
    src/Labclass.cpp
    src/Localization.cpp
    src/LocalizationMaint.cpp
    src/LocalizationStorage.cpp
    src/Logic.cpp
    src/Map.cpp
    src/Music.cpp
    src/Otherlevel.cpp
    src/preloader.cpp
    src/Render.cpp
    src/RenderFixed.cpp
    src/RoomnameTranslator.cpp
    src/Screen.cpp
    src/Script.cpp
    src/Scripts.cpp
    src/Spacestation2.cpp
    src/TerminalScripts.cpp
    src/Textbox.cpp
    src/Tower.cpp
    src/UtilityClass.cpp
    src/WarpClass.cpp
    src/XMLUtils.cpp
    src/main.cpp
    src/DeferCallbacks.c
    src/GlitchrunnerMode.c
    src/Network.c
    src/Textbook.c
    src/ThirdPartyDeps.c
    src/UTF8.c
    src/VFormat.c
    src/Vlogging.c
    src/Xoshiro.c
    ../third_party/physfs/extras/physfsrwops.c
)
if(NOT CUSTOM_LEVEL_SUPPORT STREQUAL "DISABLED")
    list(APPEND VVV_SRC src/CustomLevels.cpp)
    if(NOT CUSTOM_LEVEL_SUPPORT STREQUAL "NO_EDITOR")
        LIST(APPEND VVV_SRC src/Editor.cpp)
    endif()
endif()
if(STEAM)
    list(APPEND VVV_SRC src/SteamNetwork.c)
endif()
if(GOG)
    list(APPEND VVV_SRC src/GOGNetwork.c)
endif()

# Executable information
if(WIN32)
    add_executable(VVVVVV WIN32 ${VVV_SRC} icon.rc)
else()
    add_executable(VVVVVV ${VVV_SRC})
endif()

# Include Directories
if(BUNDLE_DEPENDENCIES)
    target_include_directories(
        VVVVVV PRIVATE
        src
        ../third_party
        ../third_party/tinyxml2
        ../third_party/physfs/src
        ../third_party/physfs/extras
        ../third_party/lodepng
        ../third_party/c-hashmap
        ../third_party/FAudio/include
        ../third_party/FAudio/src
    )
else()
    target_include_directories(
        VVVVVV PRIVATE
        src
        ../third_party
        ../third_party/lodepng
        ../third_party/physfs/extras
        ../third_party/c-hashmap
        ../third_party/FAudio/src
    )
endif()

if(MAKEANDPLAY)
    target_compile_definitions(VVVVVV PRIVATE -DMAKEANDPLAY)
endif()

if(STEAM)
    target_compile_definitions(VVVVVV PRIVATE -DSTEAM_NETWORK)
endif()
if(GOG)
    target_compile_definitions(VVVVVV PRIVATE -DGOG_NETWORK)
endif()

set(XML2_SRC
    ../third_party/tinyxml2/tinyxml2.cpp
)
set(FAUDIO_SRC
    ../third_party/FAudio/src/FAudio.c
    ../third_party/FAudio/src/FAudio_internal.c
    ../third_party/FAudio/src/FAudio_internal_simd.c
    ../third_party/FAudio/src/FAudio_operationset.c
    ../third_party/FAudio/src/FAudio_platform_sdl2.c
)
set(PFS_SRC
    ../third_party/physfs/src/physfs.c
    ../third_party/physfs/src/physfs_archiver_dir.c
    ../third_party/physfs/src/physfs_archiver_unpacked.c
    ../third_party/physfs/src/physfs_archiver_zip.c
    ../third_party/physfs/src/physfs_byteorder.c
    ../third_party/physfs/src/physfs_unicode.c
    ../third_party/physfs/src/physfs_platform_posix.c
    ../third_party/physfs/src/physfs_platform_unix.c
    ../third_party/physfs/src/physfs_platform_windows.c
    ../third_party/physfs/src/physfs_platform_haiku.cpp
)
if(APPLE)
    # Are you noticing a pattern with this Apple crap yet?
    set(PFS_SRC ${PFS_SRC} ../third_party/physfs/src/physfs_platform_apple.m)
endif()
set(PNG_SRC src/lodepng_wrapper.c)
set(CHM_SRC ../third_party/c-hashmap/map.c)

if(NOT OFFICIAL_BUILD)
    # Add interim commit hash and its date to the build

    # find_package sets GIT_FOUND and GIT_EXECUTABLE
    find_package(Git)

    if(GIT_FOUND)
        # These filenames have to be qualified, because when we run
        # the CMake script, its work dir gets set to the build folder
        set(VERSION_INPUT_FILE ${CMAKE_CURRENT_SOURCE_DIR}/src/InterimVersion.in.c)
        set(VERSION_OUTPUT_FILE ${CMAKE_CURRENT_SOURCE_DIR}/src/InterimVersion.out.c)

        add_custom_target(
            GenerateVersion ALL
            # This BYPRODUCTS line is required for this to be ran every time
            BYPRODUCTS ${VERSION_OUTPUT_FILE}
            COMMAND ${CMAKE_COMMAND}
            # These args have to be passed through, otherwise the script can't see them
            # Also, these args have to come BEFORE `-P`! (Otherwise it fails with an unclear error)
            -DGIT_EXECUTABLE=${GIT_EXECUTABLE}
            -DINPUT_FILE=${VERSION_INPUT_FILE}
            -DOUTPUT_FILE=${VERSION_OUTPUT_FILE}
            -P ${CMAKE_CURRENT_SOURCE_DIR}/version.cmake
        )

        add_dependencies(VVVVVV GenerateVersion)

        target_compile_definitions(VVVVVV PRIVATE -DINTERIM_VERSION_EXISTS)

        add_library(InterimVersion STATIC src/InterimVersion.out.c)
        list(APPEND STATIC_LIBRARIES InterimVersion)
    endif()
endif()

# Build options
if(ENABLE_WARNINGS)
    # The weird syntax is due to CMake generator expressions.
    # Saves quite a few lines and boilerplate at the price of readability.
    target_compile_options(VVVVVV PRIVATE
        $<$<OR:$<CXX_COMPILER_ID:GNU>,$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:
            -Wall -Wpedantic $<$<BOOL:${ENABLE_WERROR}>:-Werror>>
        $<$<CXX_COMPILER_ID:MSVC>:
            /W4 $<$<BOOL:${ENABLE_WERROR}>:/WX>>)
endif()

if(CUSTOM_LEVEL_SUPPORT STREQUAL "NO_EDITOR")
    target_compile_definitions(VVVVVV PRIVATE -DNO_EDITOR)
elseif(CUSTOM_LEVEL_SUPPORT STREQUAL "DISABLED")
    target_compile_definitions(VVVVVV PRIVATE -DNO_CUSTOM_LEVELS -DNO_EDITOR)
endif()

if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
    set(SUPPORTS_IMPLICIT_FALLTHROUGH TRUE)
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7.0)
        set(SUPPORTS_IMPLICIT_FALLTHROUGH TRUE)
    else()
        set(SUPPORTS_IMPLICIT_FALLTHROUGH FALSE)
    endif()
else()
    set(SUPPORTS_IMPLICIT_FALLTHROUGH FALSE)
endif()


if(SUPPORTS_IMPLICIT_FALLTHROUGH)
    target_compile_options(VVVVVV PRIVATE -Werror=implicit-fallthrough)
endif()

if(MSVC)
    # Disable MSVC warnings about implicit conversion
    target_compile_options(VVVVVV PRIVATE /wd4244)
endif()

# Disable warnings about `long long` in C++03 (from including PhysFS)
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    target_compile_options(VVVVVV PRIVATE -Wno-long-long)
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
    target_compile_options(VVVVVV PRIVATE -Wno-c++11-long-long)
endif()

if(MSVC)
    # MSVC doesn't have /std:c99 or /std:c++98 switches!

    # Disable exceptions
    string(REGEX REPLACE "/EH[a-z]+" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHsc")

    # Disable RTTI
    string(REPLACE "/GR" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GR-")
else()
    string(REGEX REPLACE "-std=[a-z0-9]+" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")

    string(REGEX REPLACE "-std=[a-z0-9+]+" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++98")

    # Disable exceptions
    string(REPLACE "-fexceptions" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")

    # Disable RTTI
    string(REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
endif()

# Unfortunately, it doesn't seem like distros package LodePNG
add_library(lodepng-static STATIC ${PNG_SRC})

target_compile_definitions(lodepng-static PRIVATE
    -DLODEPNG_NO_COMPILE_ALLOCATORS
    -DLODEPNG_NO_COMPILE_DISK
    -DLODEPNG_NO_COMPILE_ENCODER
)

add_library(c-hashmap-static STATIC ${CHM_SRC})

if(BUNDLE_DEPENDENCIES)
    list(APPEND STATIC_LIBRARIES physfs-static tinyxml2-static lodepng-static c-hashmap-static faudio-static)
else()
    list(APPEND STATIC_LIBRARIES lodepng-static c-hashmap-static)
endif()

if(BUNDLE_DEPENDENCIES)
    add_library(tinyxml2-static STATIC ${XML2_SRC})
    add_library(physfs-static STATIC ${PFS_SRC})
    target_compile_definitions(physfs-static PRIVATE
        -DPHYSFS_SUPPORTS_DEFAULT=0 -DPHYSFS_SUPPORTS_ZIP=1
    )
    add_library(faudio-static STATIC ${FAUDIO_SRC})
    target_include_directories(
        faudio-static PRIVATE
        ../third_party/FAudio/include
    )
    # Disable FAudio debug stuff in release mode. This needs a generator expression for CMake reasons(TM)
    target_compile_definitions(faudio-static PRIVATE $<$<CONFIG:Release>:FAUDIO_DISABLE_DEBUGCONFIGURATION>)

    target_link_libraries(VVVVVV ${STATIC_LIBRARIES})
else()
    find_package(utf8cpp CONFIG)

    target_link_libraries(VVVVVV ${STATIC_LIBRARIES} physfs tinyxml2 utf8cpp FAudio)
endif()


if(MSVC)
    # Statically link Microsoft's runtime library so end users don't have to install it
    list(APPEND GLOBAL_COMPILE_FLAGS /MT)
endif()


if(REMOVE_ABSOLUTE_PATHS)
    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
        if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 3.8)
            set(SUPPORTS_DEBUG_PREFIX_MAP TRUE)
        else()
            set(SUPPORTS_DEBUG_PREFIX_MAP FALSE)
        endif()
        if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 10.0)
            set(SUPPORTS_FILE_PREFIX_MAP TRUE)
        else()
            set(SUPPORTS_FILE_PREFIX_MAP FALSE)
        endif()
    elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
        set(SUPPORTS_DEBUG_PREFIX_MAP TRUE)
        if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 8.0)
            set(SUPPORTS_FILE_PREFIX_MAP TRUE)
        else()
            set(SUPPORTS_FILE_PREFIX_MAP FALSE)
        endif()
    else()
        set(SUPPORTS_DEBUG_PREFIX_MAP FALSE)
        set(SUPPORTS_FILE_PREFIX_MAP FALSE)
    endif()

    get_filename_component(REPO_DIR ../ ABSOLUTE)

    # Remove absolute source paths from compiled binary
    if(SUPPORTS_FILE_PREFIX_MAP)
        list(APPEND GLOBAL_COMPILE_FLAGS -ffile-prefix-map=${REPO_DIR}=.)
    elseif(SUPPORTS_DEBUG_PREFIX_MAP)
        list(APPEND GLOBAL_COMPILE_FLAGS -fdebug-prefix-map=${REPO_DIR}=.)
    endif()
endif()


target_compile_options(VVVVVV PRIVATE ${GLOBAL_COMPILE_FLAGS})

foreach(static_library IN LISTS STATIC_LIBRARIES)
    target_compile_options(${static_library} PRIVATE ${GLOBAL_COMPILE_FLAGS})
endforeach(static_library)


# SDL2 Dependency (Detection pulled from FAudio)
if(DEFINED SDL2_INCLUDE_DIRS AND DEFINED SDL2_LIBRARIES)
    message(STATUS "Using pre-defined SDL2 variables SDL2_INCLUDE_DIRS and SDL2_LIBRARIES")
    target_include_directories(VVVVVV SYSTEM PRIVATE "$<BUILD_INTERFACE:${SDL2_INCLUDE_DIRS}>")
    target_link_libraries(VVVVVV ${SDL2_LIBRARIES})
    if(BUNDLE_DEPENDENCIES)
        target_include_directories(faudio-static SYSTEM PRIVATE "$<BUILD_INTERFACE:${SDL2_INCLUDE_DIRS}>")
        target_link_libraries(faudio-static ${SDL2_LIBRARIES})
    endif()
elseif (EMSCRIPTEN)
    message(STATUS "Using Emscripten SDL2")
    target_compile_options(VVVVVV PUBLIC -sUSE_SDL=2)
    target_link_libraries(VVVVVV -sUSE_SDL=2)
    if(BUNDLE_DEPENDENCIES)
        target_compile_options(faudio-static PUBLIC -sUSE_SDL=2)
        target_link_libraries(faudio-static -sUSE_SDL=2)
    endif()
else()
    # Only try to autodetect if both SDL2 variables aren't explicitly set
    find_package(SDL2 CONFIG)
    if(TARGET SDL2::SDL2)
        message(STATUS "Using TARGET SDL2::SDL2")
        target_link_libraries(VVVVVV SDL2::SDL2)
        if(BUNDLE_DEPENDENCIES)
            target_link_libraries(faudio-static SDL2::SDL2)
        endif()
    elseif(TARGET SDL2)
        message(STATUS "Using TARGET SDL2")
        target_link_libraries(VVVVVV SDL2)
        if(BUNDLE_DEPENDENCIES)
            target_link_libraries(faudio-static SDL2)
        endif()
    else()
        message(STATUS "No TARGET SDL2::SDL2, or SDL2, using variables")
        target_include_directories(VVVVVV SYSTEM PRIVATE "$<BUILD_INTERFACE:${SDL2_INCLUDE_DIRS}>")
        target_link_libraries(VVVVVV ${SDL2_LIBRARIES})
        if(BUNDLE_DEPENDENCIES)
            target_include_directories(faudio-static SYSTEM PRIVATE "$<BUILD_INTERFACE:${SDL2_INCLUDE_DIRS}>")
            target_link_libraries(faudio-static ${SDL2_LIBRARIES})
        endif()
    endif()
endif()

# Yes, more Apple Crap
if(APPLE)
    find_library(FOUNDATION NAMES Foundation)
    find_library(IOKIT NAMES IOKit)
    target_link_libraries(VVVVVV objc ${IOKIT} ${FOUNDATION})
endif()
# But hey, also some Haiku crap
if(HAIKU)
    find_library(BE_LIBRARY be)
    find_library(ROOT_LIBRARY root)
    target_link_libraries(VVVVVV ${BE_LIBRARY} ${ROOT_LIBRARY})
endif()
if(EMSCRIPTEN)
    # 256MB is enough for everybody
    target_link_libraries(VVVVVV -sFORCE_FILESYSTEM=1 -sTOTAL_MEMORY=256MB)
endif()