cmake_minimum_required(VERSION 3.16)
include(CheckIPOSupported)
include(CPM.cmake)

project(pkmnLib)

# We like new stuff, so set the c++ standard to c++20.
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)

option(WINDOWS "Whether the build target is Windows or not." OFF)
option(SHARED "Whether we should build a shared library, instead of a static one." ON)
option(PKMNLIB_TESTS "Whether the test executable should be build as well." OFF)
option(SANITIZER_TESTS "Whether the test executable should be built using address sanitizer." ON)
option(STATICC "Whether gcc and stdc++ should be linked statically to the library." OFF)
option(ANGELSCRIPT_DEBUGGER "Include the angelscript debug server in the build." OFF)
set(SCRIPT_PROVIDER "angelscript" CACHE STRING "Which script provider to use.")
set(LEVEL_SIZE "8" CACHE STRING "Number of bits to store the level as. Can be 8")

if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    add_compile_options(-fconcepts)
endif ()

if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
    add_link_options(-fuse-ld=lld)
    # Only warn for unknown sanitizers. This error is not major enough to error on.
    add_compile_options(-Wno-error=unknown-sanitizers)
    # Ignore pedantic nullability extension warning, as we only use this for clang specifically
    add_compile_options(-Wno-nullability-extension)
    # As far as I can tell this is an invalid pedantic warning since C++ 20. Empty variadic macro arguments is completely legal.
    add_compile_options(-Wno-gnu-zero-variadic-macro-arguments)
endif ()

execute_process(COMMAND mkdir -p ${CMAKE_CURRENT_BINARY_DIR}/include)

CPMAddPackage(
        NAME Arbutils
        GIT_REPOSITORY https://git.p-epsilon.com/Deukhoofd/Arbutils.git
        GIT_TAG master
        OPTIONS
        "SHARED=${SHARED}"
        "WINDOWS=${WINDOWS}"
        "STATICC=${STATICC}"
)
execute_process(COMMAND ln -sf ${Arbutils_SOURCE_DIR}/src ${CMAKE_CURRENT_BINARY_DIR}/include/Arbutils)

CPMAddPackage(
        NAME CreatureLib
        GIT_REPOSITORY https://git.p-epsilon.com/Deukhoofd/CreatureLib.git
        GIT_TAG master
        OPTIONS
        "SHARED=${SHARED}"
        "WINDOWS=${WINDOWS}"
        "STATICC=${STATICC}"
)
execute_process(COMMAND ln -sf ${CreatureLib_SOURCE_DIR}/src ${CMAKE_CURRENT_BINARY_DIR}/include/CreatureLib)

if (SCRIPT_PROVIDER STREQUAL "angelscript")
    CPMAddPackage(
            NAME Angelscript
            GIT_REPOSITORY https://git.p-epsilon.com/Deukhoofd/Angelscript.git
            GIT_TAG master
            DOWNLOAD_ONLY YES
    )

    if (Angelscript_ADDED)
        execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" . -B ${Angelscript_BINARY_DIR}
                -DBUILD_SHARED_LIBS=${SHARED} -DMSVC=${WINDOWS} -DLINK_STD_STATICALLY=${STATICC} -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON
                RESULT_VARIABLE result
                WORKING_DIRECTORY ${Angelscript_SOURCE_DIR}/angelscript/projects/cmake)
        execute_process(COMMAND ${CMAKE_COMMAND} --build ${Angelscript_BINARY_DIR}
                RESULT_VARIABLE result
                WORKING_DIRECTORY ${Angelscript_SOURCE_DIR}/angelscript/projects/cmake)
    endif ()

    include_directories(${CMAKE_CURRENT_BINARY_DIR}/include)
    include_directories(${Angelscript_SOURCE_DIR}/angelscript/include)
    include_directories(${Angelscript_SOURCE_DIR}/add_on)
endif ()

if (WINDOWS)
    SET(CMAKE_SYSTEM_NAME Windows)
    ADD_DEFINITIONS(-D WINDOWS=1)
endif (WINDOWS)

if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    # The angelscript libraries break these warnings extensively. Turn them off.
    add_compile_options(-Wno-error=cast-function-type -Wno-cast-function-type)
    add_compile_options(-Wno-error=type-limits -Wno-type-limits)
endif ()

message(STATUS "Using:
\t C ${CMAKE_C_COMPILER}
\t C++ ${CMAKE_CXX_COMPILER}
\t CXX ABI ${CMAKE_CXX_COMPILER_ABI}
\t C++ Version ${CMAKE_CXX_STANDARD}")


if (LEVEL_SIZE STREQUAL "8")
    add_definitions(-DLEVEL_U8)
    message(STATUS "Using level size of 8")
elseif (LEVEL_SIZE STREQUAL "16")
    add_definitions(-DLEVEL_U16)
    message(STATUS "Using level size of 16")
elseif (LEVEL_SIZE STREQUAL "32")
    add_definitions(-DLEVEL_U32)
    message(STATUS "Using level size of 32")
elseif (LEVEL_SIZE STREQUAL "64")
    add_definitions(-DLEVEL_U64)
    message(STATUS "Using level size of 64")
else ()
    message(FATAL_ERROR, "Invalid level size was given.")
endif ()

if (CMAKE_BUILD_TYPE MATCHES Release AND NOT WINDOWS)
    # Include debug symbols in all linux builds
    message("Including debug symbols")
    add_compile_options(-g -gline-tables-only)
endif ()

# Set whether we want a static or shared library.
set(LIBTYPE STATIC)
if (SHARED)
    set(LIBTYPE SHARED)
endif (SHARED)

SET(FILE_SOURCE
        "src/Battling/*.cpp"
        "src/Battling/*.hpp"
        "src/Library/*.cpp"
        "src/Library/*.hpp"
        "CInterface/Core.*"
        "CInterface/Library/*.cpp"
        "CInterface/Library/*.hpp"
        "CInterface/Battling/*.cpp"
        "CInterface/Battling/*.hpp"
        )
if (SCRIPT_PROVIDER STREQUAL "angelscript")
    SET(FILE_SOURCE ${FILE_SOURCE}
            "src/ScriptResolving/AngelScript/*.cpp"
            "src/ScriptResolving/AngelScript/*.hpp"
            "${Angelscript_SOURCE_DIR}/add_on/scriptbuilder/scriptbuilder.cpp"
            "${Angelscript_SOURCE_DIR}/add_on/scripthelper/scripthelper.cpp"
            "${Angelscript_SOURCE_DIR}/add_on/scripthandle/scripthandle.cpp"
            "${Angelscript_SOURCE_DIR}/add_on/scriptstdstring/scriptstdstring.cpp"
            "${Angelscript_SOURCE_DIR}/add_on/scriptdictionary/scriptdictionary.cpp"
            "${Angelscript_SOURCE_DIR}/add_on/scriptarray/scriptarray.cpp"
            "${Angelscript_SOURCE_DIR}/add_on/scriptmath/scriptmath.cpp"
            "CInterface/AngelScript/*.cpp"
            "CInterface/AngelScript/*.hpp"
            )
    if (ANGELSCRIPT_DEBUGGER)
        CPMAddPackage(
                NAME AngelscriptDebugger
                GIT_REPOSITORY https://git.p-epsilon.com/Deukhoofd/AngelscriptDebuggerServer.git
                GIT_TAG master
        )
        execute_process(COMMAND ln -sf ${AngelscriptDebugger_SOURCE_DIR}/src ${CMAKE_CURRENT_BINARY_DIR}/include/AngelscriptDebuggerServer)
        set(_LINKS ${_LINKS} AngelscriptDebugger)
        set(_TESTLINKS ${_TESTLINKS} AngelscriptDebugger)
    endif ()
    ADD_DEFINITIONS(-D AS_USE_ACCESSORS=1)
endif ()

file(GLOB_RECURSE CORE_SRC_FILES ${FILE_SOURCE})
add_library(pkmnLib ${LIBTYPE} ${CORE_SRC_FILES})
# Enable all warnings, and make them error when occurring.
target_compile_options(pkmnLib PRIVATE -Wall -Wextra -Werror -pedantic-errors)
target_link_directories(pkmnLib PUBLIC ${Angelscript_BINARY_DIR})

# If interprocedural optimization is available, apply it
check_ipo_supported(RESULT IPO_SUPPORTED)
if (IPO_SUPPORTED)
    message(STATUS "IPO / LTO enabled")
    set_property(TARGET pkmnLib PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
endif ()

SET(_LINKS ${_LINKS} CreatureLib Arbutils)
SET(_TESTLINKS ${_TESTLINKS} pkmnLib CreatureLib Arbutils)

if (SCRIPT_PROVIDER STREQUAL "angelscript")
    message(STATUS "Using Angelscript as script provider.")
    ADD_DEFINITIONS(-D ANGELSCRIPT=1)
    SET(_LINKS ${_LINKS} angelscript)
    SET(_TESTLINKS ${_TESTLINKS} angelscript)
    if (ANGELSCRIPT_DEBUGGER)
        ADD_DEFINITIONS(-D ANGELSCRIPT_DEBUGGER=1)
    endif ()
endif ()

# If we are building for Windows we need to set some specific variables.
if (WINDOWS)
    MESSAGE(WARNING, "Using Windows Build.")
    # Add a definition for the compiler, so we can use it in C++ as well.
    ADD_DEFINITIONS(-D WINDOWS=1)
    # -m64: Build a 64 bit library
    add_compile_options(-m64)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wl,-allow-multiple-definition")
    if (SHARED)
        set_target_properties(pkmnLib PROPERTIES SUFFIX ".dll")
    endif (SHARED)
    set(_LINKS ${_LINKS} -Wl,-Bstatic -lws2_32 -lstdc++ -lpthread -Wl,-Bdynamic)
    set(_TESTLINKS ${_TESTLINKS} -Wl,-Bstatic -lws2_32 -lstdc++ -lpthread -Wl,-Bdynamic)
endif (WINDOWS)

if (STATICC)
    set(CMAKE_SHARED_LINKER_FLAGS "-Wl,--as-needed")
    message(STATUS "Linking C library statically")
    set(_LINKS ${_LINKS} -static-libstdc++)
    SET(_TESTLINKS ${_TESTLINKS})
endif ()

target_link_libraries(pkmnLib PUBLIC ${_LINKS})

if (PKMNLIB_TESTS)
    CPMAddPackage(
            NAME doctest
            GITHUB_REPOSITORY doctest/doctest
            GIT_TAG v2.4.8
            DOWNLOAD_ONLY YES
    )

    # Create Test executable
    file(GLOB_RECURSE TEST_FILES "tests/*.cpp" "tests/*.hpp")
    add_executable(pkmnLibTests ${TEST_FILES})
    # Enable all warnings, and make them error when occurring.
    target_compile_options(pkmnLibTests PRIVATE -Wall -Wextra -Werror -pedantic-errors)

    message(STATUS "${_TESTLINKS}")
    target_link_libraries(pkmnLibTests PUBLIC ${_TESTLINKS})
    target_include_directories(pkmnLibTests PUBLIC ${doctest_SOURCE_DIR}/doctest)


    # Add a definition for the test library
    target_compile_definitions(pkmnLibTests PRIVATE TESTS_BUILD)
    if (SANITIZER_TESTS AND NOT WINDOWS)
        # Turn on a set of standard sanitizers
        # We don't want to recover from any sanitizer error
        # Except unsigned overflows (often used in standard libraries etc)
        # Except alignment (Angelscript aligns data wrong when allocating, and I don't have the time to fix Angelscripts allocation.)
        SET(SANITIZER_OPTS -fsanitize=address,undefined,leak,integer,nullability -fno-sanitize-recover=all -fno-sanitize=unsigned-integer-overflow -fsanitize-recover=alignment)
        target_compile_options(pkmnLib PRIVATE ${SANITIZER_OPTS})
        target_compile_options(pkmnLibTests PRIVATE ${SANITIZER_OPTS})
        target_link_options(pkmnLibTests PRIVATE ${SANITIZER_OPTS})
    endif ()
endif ()

if (ANGELSCRIPT_DEBUGGER)
    include_directories(extern/AngelscriptDebuggerServer/extern/asio-1.18.2/include)
endif ()