cmake_minimum_required(VERSION 3.10)

# Project and C standard configuration
project(bhlib LANGUAGES C)
set(CMAKE_C_STANDARD 90)
set(CMAKE_C_STANDARD_REQUIRED ON)

# Project includes
include(CheckIPOSupported)
include(CheckIncludeFile)
include(CheckSymbolExists)

# Project settings
option(BH_PLATFORM_THREADS "Enable multithreading support" TRUE)
option(BH_BIGINT_LONG "Use bigger internal units for big integer calculations" TRUE)

# Check for IPO/LTO
check_ipo_supported(RESULT supported)

if(supported)
    message(STATUS "IPO/LTO enabled")
    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
endif()

# Enable testing
include(CTest)
enable_testing()

# Set library code
set(BH_SOURCE
    src/algo.c
    src/buffer.c
    src/hashmap.c
    src/queue.c
    src/thread.c
    src/io.c
    src/deflate.c
    src/bigint.c
)

set(BH_HEADER
    include/bh/bh.h
    include/bh/platform.h
    include/bh/buffer.h
    include/bh/algo.h
    include/bh/hashmap.h
    include/bh/queue.h
    include/bh/thread.h
    include/bh/io.h
    include/bh/deflate.h
    include/bh/bigint.h
)

set(BH_INCLUDE_DIRS
    include
    ${PROJECT_BINARY_DIR}/include
)


# Determine platform
if(WIN32)
    message(STATUS "Platform - Win32")
    set(BH_PLATFORM_WIN TRUE)
    option(BH_THREADS_WINXP "Enable threading support for Windows XP" FALSE)

    # Add platform dependent files
    list(APPEND BH_SOURCE
        src/file_win.c
    )

    # Check multithreading support
    if(BH_PLATFORM_THREADS)
        check_symbol_exists(_beginthread process.h BH_PLATFORM_THREADS)
    endif()

    if(BH_PLATFORM_THREADS)
        message(STATUS "Multithreading enabled")
        list(APPEND BH_SOURCE
            src/thread_win.c
        )
    else()
        message(STATUS "Multithreading disabled")
        list(APPEND BH_SOURCE
            src/thread_null.c
        )
    endif()
    
    if(NOT BH_THREADS_WINXP)
        add_definitions(-D_WIN32_WINNT=_WIN32_WINNT_VISTA -DWINVER=_WIN32_WINNT_VISTA)
    endif()
elseif(UNIX)
    message(STATUS "Platform: Unix (Linux/BSD/MacOS X)")
    set(BH_PLATFORM_POSIX TRUE)

    # Add platform dependent files
    list(APPEND BH_SOURCE
        src/file_posix.c
    )

    # Check multithreading support
    if(BH_PLATFORM_THREADS)
        check_include_file(pthread.h BH_PLATFORM_THREADS)
    endif()

    if(BH_PLATFORM_THREADS)
        message(STATUS "Multithreading enabled")
        list(APPEND BH_SOURCE
            src/thread_posix.c
        )
    else()
        message(STATUS "Multithreading disabled")
        list(APPEND BH_SOURCE
            src/thread_null.c
        )
    endif()
else()
    message(STATUS "Platform: Unknown")
    message(STATUS "Multithreading disabled")
    list(APPEND BH_SOURCE
        src/thread_null.c
        src/file_null.c
    )
endif()

# Configure library
configure_file(include/bh/config.in include/bh/config.h)
configure_file(include/bh/internal/config.in include/bh/internal/config.h)

# Library
add_library(bhlib STATIC ${BH_SOURCE} ${BH_HEADER})
target_include_directories(bhlib PUBLIC ${BH_INCLUDE_DIRS})

# Enable warnings and pedantics
if(MSVC)
    target_compile_options(bhlib PRIVATE /W4)
else()
    target_compile_options(bhlib PRIVATE -Wall -Wextra -Wpedantic)
endif()

# Runtime definition
add_executable(main
               main.c
)

target_link_libraries(main bhlib)

# Tests
add_subdirectory(unit)
add_subdirectory(tests)