cmake_minimum_required(VERSION 3.5)

project(OpenTTD)

if (CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)
    message(FATAL_ERROR "In-source builds not allowed. Please run \"cmake ..\" from the bin directory")
endif (CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR)

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")

# Use GNUInstallDirs to allow customisation
# but set our own default data dir
if (NOT CMAKE_INSTALL_DATADIR)
    set(CMAKE_INSTALL_DATADIR "share/games")
endif (NOT CMAKE_INSTALL_DATADIR)
include(GNUInstallDirs)

include(Options)
set_options()
set_directory_options()

include(Static)
set_static_if_needed()

# Prefer -pthread over -lpthread, which is often the better option of the two.
set(CMAKE_THREAD_PREFER_PTHREAD YES)
# Make sure we have Threads available.
find_package(Threads REQUIRED)

find_package(ZLIB)
find_package(LibLZMA)
find_package(LZO)
find_package(PNG)
if (NOT WIN32)
    find_package(SDL2)
    if (NOT SDL2_FOUND)
        find_package(SDL)
    endif( NOT SDL2_FOUND)
    find_package(Allegro)
    find_package(Fluidsynth)
    find_package(Freetype)
    find_package(Fontconfig)
    find_package(ICU OPTIONAL_COMPONENTS i18n lx)
    find_package(XDG_basedir)
endif (NOT WIN32)
if (APPLE)
    find_package(Iconv)

    find_library(AUDIOTOOLBOX_LIBRARY AudioToolbox)
    find_library(AUDIOUNIT_LIBRARY AudioUnit)
    find_library(COCOA_LIBRARY Cocoa)
endif (APPLE)

if (MSVC)
    find_package(Editbin REQUIRED)
endif (MSVC)

find_package(SSE)
find_package(Xaudio2)

find_package(Grfcodec)

# IPO is only properly supported from CMake 3.9. Despite the fact we are
# CMake 3.5, still enable IPO if we detect we are 3.9+.
if (POLICY CMP0069)
    cmake_policy(SET CMP0069 NEW)
    include(CheckIPOSupported)
    check_ipo_supported(RESULT IPO_FOUND)
endif (POLICY CMP0069)

show_options()

if (UNIX AND NOT APPLE AND NOT OPTION_DEDICATED)
    if (NOT SDL_FOUND AND NOT SDL2_FOUND)
        message(FATAL_ERROR "SDL or SDL2 is required for this platform")
    endif (NOT SDL_FOUND AND NOT SDL2_FOUND)
endif (UNIX AND NOT APPLE AND NOT OPTION_DEDICATED)
if (APPLE)
    if (NOT AUDIOTOOLBOX_LIBRARY)
        message(FATAL_ERROR "AudioToolbox is required for this platform")
    endif (NOT AUDIOTOOLBOX_LIBRARY)
    if (NOT AUDIOUNIT_LIBRARY)
        message(FATAL_ERROR "AudioUnit is required for this platform")
    endif (NOT AUDIOUNIT_LIBRARY)
    if (NOT COCOA_LIBRARY)
        message(FATAL_ERROR "Cocoa is required for this platform")
    endif (NOT COCOA_LIBRARY)
endif (APPLE)

if (MSVC)
    # C++17 for MSVC
    set(CMAKE_CXX_STANDARD 17)
else (MSVC)
    # C++11 for all other targets
    set(CMAKE_CXX_STANDARD 11)
endif (MSVC)

set(CMAKE_CXX_STANDARD_REQUIRED YES)
set(CMAKE_CXX_EXTENSIONS NO)

set(CMAKE_EXPORT_COMPILE_COMMANDS YES)

list(APPEND GENERATED_SOURCE_FILES "${CMAKE_BINARY_DIR}/generated/rev.cpp")
if (WIN32)
    list(APPEND GENERATED_SOURCE_FILES "${CMAKE_BINARY_DIR}/generated/ottdres.rc")
endif (WIN32)

# Generate a target to determine version, which is execute every 'make' run
add_custom_target(find_version
        ${CMAKE_COMMAND}
                -DFIND_VERSION_BINARY_DIR=${CMAKE_BINARY_DIR}/generated
                -DCPACK_BINARY_DIR=${CMAKE_BINARY_DIR}
                -P "${CMAKE_SOURCE_DIR}/cmake/scripts/FindVersion.cmake"
        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
        BYPRODUCTS ${GENERATED_SOURCE_FILES}
)

include(SourceList)
include(Endian)
add_endian_definition()

# Needed by rev.cpp
include_directories(${CMAKE_SOURCE_DIR}/src)
# Needed by everything that uses Squirrel
include_directories(${CMAKE_SOURCE_DIR}/src/3rdparty/squirrel/include)

include(CompileFlags)
compile_flags()

add_executable(openttd WIN32 ${GENERATED_SOURCE_FILES})
# All other files are added via target_sources()

include(AddCustomXXXTimestamp)
add_subdirectory(${CMAKE_SOURCE_DIR}/src)
add_subdirectory(${CMAKE_SOURCE_DIR}/media/baseset)

add_dependencies(openttd
    find_version)

target_link_libraries(openttd
    openttd::languages
    openttd::settings
    openttd::basesets
    Threads::Threads
)

if (IPO_FOUND)
    set_target_properties(openttd PROPERTIES INTERPROCEDURAL_OPTIMIZATION_RELEASE True)
    set_target_properties(openttd PROPERTIES INTERPROCEDURAL_OPTIMIZATION_MINSIZEREL True)
    set_target_properties(openttd PROPERTIES INTERPROCEDURAL_OPTIMIZATION_RELWITHDEBINFO True)
endif (IPO_FOUND)
set_target_properties(openttd PROPERTIES VS_DEBUGGER_WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}/bin")
process_compile_flags()

if (APPLE OR UNIX)
    add_definitions(-DUNIX)
endif (APPLE OR UNIX)

include(LinkPackage)
link_package(PNG TARGET PNG::PNG ENCOURAGED)
link_package(ZLIB TARGET ZLIB::ZLIB ENCOURAGED)
link_package(LIBLZMA TARGET LibLZMA::LibLZMA ENCOURAGED)
link_package(LZO ENCOURAGED)
link_package(XDG_basedir)

if (NOT OPTION_DEDICATED)
    link_package(Fluidsynth)
    link_package(SDL)
    link_package(SDL2 TARGET SDL2::SDL2)
    link_package(Allegro)
    link_package(FREETYPE TARGET Freetype::Freetype)
    link_package(Fontconfig TARGET Fontconfig::Fontconfig)
    link_package(ICU_lx)
    link_package(ICU_i18n)
endif (NOT OPTION_DEDICATED)

if (APPLE)
    link_package(Iconv TARGET Iconv::Iconv)

    target_link_libraries(openttd
        ${AUDIOTOOLBOX_LIBRARY}
        ${AUDIOUNIT_LIBRARY}
        ${COCOA_LIBRARY}
    )

    add_definitions(
        -DWITH_COCOA
        -DENABLE_COCOA_QUARTZ
    )
endif (APPLE)

if (NOT PERSONAL_DIR STREQUAL "(not set)")
    add_definitions(
        -DWITH_PERSONAL_DIR
        -DPERSONAL_DIR="${PERSONAL_DIR}"
    )
endif (NOT PERSONAL_DIR STREQUAL "(not set)")

if (NOT SHARED_DIR STREQUAL "(not set)")
    add_definitions(
        -DWITH_SHARED_DIR
        -DSHARED_DIR="${SHARED_DIR}"
    )
endif (NOT SHARED_DIR STREQUAL "(not set)")

if (NOT GLOBAL_DIR STREQUAL "(not set)")
    add_definitions(
        -DGLOBAL_DATA_DIR="${GLOBAL_DIR}"
    )
endif (NOT GLOBAL_DIR STREQUAL "(not set)")

link_package(SSE)

add_definitions_based_on_options()

if (WIN32)
    add_definitions(
        -DUNICODE
        -D_UNICODE
        -DWITH_UNISCRIBE
    )

    target_link_libraries(openttd
        ws2_32
        winmm
        imm32
    )
endif (WIN32)

if (CMAKE_SIZEOF_VOID_P EQUAL 8)
    add_definitions(-D_SQ64)
endif (CMAKE_SIZEOF_VOID_P EQUAL 8)

include(CreateRegression)
create_regression()

include(InstallAndPackage)