cmake_minimum_required(VERSION 3.13)
include(CheckIPOSupported)

project(pkmnLib)

# Enable all warnings, and make them error when occurring.
add_compile_options(-Wall -Wextra -Werror)
# 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." OFF)
option(TESTS "Whether the test executable should be build as well." OFF)
option(STATICC "Whether gcc and stdc++ should be linked statically to the library." 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)
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 ()

include(CmakeConanSetup.cmake)
SetupConan()

message(STATUS "Using Conan Libs:")
foreach (_conanLib ${CONAN_LIBS})
    message(STATUS "\t ${_conanLib}")
endforeach ()

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"
            "extern/angelscript_addons/*.cpp"
            "extern/angelscript_addons/*.h"
            "CInterface/AngelScript/*.cpp"
            "CInterface/AngelScript/*.hpp"
            )
    ADD_DEFINITIONS(-D AS_USE_ACCESSORS=1)
endif ()

file(GLOB_RECURSE CORE_SRC_FILES ${FILE_SOURCE})
add_library(pkmnLib ${LIBTYPE} ${CORE_SRC_FILES})
target_precompile_headers(pkmnLib PUBLIC src/Precompiled.hxx)

# 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 CreatureLib Arbutils)
SET(_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)
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)
endif (WINDOWS)

if (NOT WINDOWS)
    set(_LINKS ${_LINKS} -lbfd -ldl)
endif ()

if (STATICC)
    set (CMAKE_SHARED_LINKER_FLAGS "-Wl,--as-needed")
    message(STATUS "Linking C library statically")
    set(_LINKS ${_LINKS} -static-libgcc -static-libstdc++ -Wl,-Bstatic -lm -lstdc++ -lpthread)
    SET(_TESTLINKS ${_TESTLINKS} -lpthread -static-libgcc -static-libstdc++ -Wl,-Bstatic -lstdc++)
else()
    SET(_LINKS ${_LINKS} Threads::Threads)
endif()

target_link_libraries(pkmnLib PUBLIC ${_LINKS})

if (TESTS)
    # Create Test executable
    file(GLOB_RECURSE TEST_FILES "tests/*.cpp" "tests/*.hpp")
    add_executable(pkmnLibTests ${TEST_FILES} extern/doctest.hpp)
    message(STATUS "${_TESTLINKS}")
    target_link_libraries(pkmnLibTests PUBLIC ${_TESTLINKS})

    # Add a definition for the test library
    target_compile_definitions(pkmnLibTests PRIVATE TESTS_BUILD)
endif ()