if ("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
    cmake_minimum_required(VERSION 3.5)
    project(photon C ASM-ATT)
endif ()

macro(subdirlist result curdir)
    file(GLOB children RELATIVE ${curdir} ${curdir}/*)
    set(dirlist "")
    foreach (child ${children})
        if (IS_DIRECTORY ${curdir}/${child})
            list(APPEND dirlist ${child})
        endif()
    endforeach()
    set(${result} ${dirlist})
endmacro()

include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/platform.cmake)
platform_config(${PHOTON_TARGET})

message(STATUS "Target: ${machine}-${platform}")
file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/target.txt "${machine}-${platform}")

include(${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/config.cmake)

set(CMAKE_EXE_LINKER_FLAGS
    "${CMAKE_EXE_LINKER_FLAGS} -ffreestanding -nostdlib -lgcc")

set(malloc_impl dlmalloc)
set(photon_libc_sources "")
set(generic_dirs string stdio stdlib errno internal ctype wchar)

message(STATUS "Memory allocator: ${malloc_impl}")

foreach (dir ${generic_dirs})
    file(GLOB dir_sources ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/${dir}/*.c)
    set(photon_libc_sources ${photon_libc_sources} ${dir_sources})
endforeach (dir)

file(GLOB malloc_sources
    ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/malloc/${malloc_impl}/*.c
    ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/malloc/${malloc_impl}/*.h)
file(GLOB_RECURSE photon_libc_headers ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/include/*.h)

file(GLOB photon_libc_crt
    ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/machine/${machine}/crt*.s)
message(STATUS "CRT files: ${photon_libc_crt}")

foreach (crt_file ${photon_libc_crt})
    get_filename_component(crt_name ${crt_file} NAME_WE)
    set(crt_path ${CMAKE_CURRENT_BINARY_DIR}/${crt_name}.o)
    set(crt_bin ${crt_bin} ${crt_path})
    add_custom_command(
        OUTPUT ${crt_path}
        COMMAND ${CMAKE_C_COMPILER} -c -ffreestanding ${crt_file}
        COMMENT "Assembling ${crt_bin}")
endforeach ()

add_custom_target(crt ALL
    DEPENDS ${crt_bin}
    COMMENT "Generating CRT files")

set(photon_libc_crt_bin ${crt_bin} PARENT_SCOPE)

file(GLOB platform_sources
    ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/*.c
    ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/machine/${machine}/*.c
    ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/machine/${machine}/*.s)

foreach (platform_source_dir ${photon_platform_extra_source_dirs})
    file(GLOB dir_sources
        ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/${platform_source_dir}/*.c
        ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/${platform_source_dir}/*.h)
    set(platform_sources ${platform_sources} ${dir_sources})
endforeach (platform_source_dir)

foreach (platform_include_dir ${photon_platform_extra_include_dirs})
    file(GLOB dir_sources
        ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/${platform_include_dir}/*.h)
    set(platform_sources ${platform_sources} ${dir_sources})
endforeach (platform_include_dir)

foreach (crt_source ${photon_libc_crt})
    list(REMOVE_ITEM platform_sources ${crt_source})
endforeach (crt_source)

file(GLOB platform_headers
    ${CMAKE_CURRENT_SOURCE_DIR}/photon/sys/${platform}/*.h
    ${CMAKE_CURRENT_SOURCE_DIR}/photon/sys/${platform}/machine/${machine}/*.h)

set(photon_libc_sources ${photon_libc_sources} ${malloc_sources} ${platform_sources})
set(photon_libc_headers ${photon_libc_headers} ${platform_headers})
set(photon_libc_include_dirs
    ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/include
    ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/
    ${CMAKE_CURRENT_BINARY_DIR}/sysroot/usr/include)

set(photon_libc_cflags -ffreestanding -nostdlib -fPIC -fPIE)

add_custom_target(photon-prefix
    DEPENDS ${photon_libc_headers}
    COMMAND ${Python3_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/scripts/generate-sysroot.py
        ${CMAKE_CURRENT_SOURCE_DIR}
        ${CMAKE_CURRENT_BINARY_DIR}
        ${CMAKE_CURRENT_BINARY_DIR}/prefix
        ${machine} ${platform})

if (PHOTON_EXPORT_VARS)
    set(photon_libc_sources ${photon_libc_sources} PARENT_SCOPE)
    set(photon_libc_headers ${photon_libc_headers} ${platform_headers} PARENT_SCOPE)
    set(photon_libc_crt ${photon_libc_crt} PARENT_SCOPE)
    set(photon_libc_cflags ${photon_libc_cflags} PARENT_SCOPE)
    set(photon_libc_include_dirs ${photon_libc_include_dirs} PARENT_SCOPE)
    return ()
endif ()

# add_framework(photon STATIC SHARED
#     BUNDLE_ID net.doorstuck.photon
#     SOURCES ${photon_libc_sources} ${photon_libc_headers}
#     HEADERS ${CMAKE_CURRENT_BINARY_DIR}/sysroot/usr/include/*)
#
# bundle_compile_options(photon PRIVATE -ffreestanding -nostdlib -fPIC -fPIE)
# bundle_link_libraries(photon ${photon_platform_libs} -ffreestanding -nostdlib)
# bundle_link_frameworks(photon ${photon_platform_frameworks})
#
# bundle_include_directories(photon PRIVATE
#     ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/include
#     ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/
#     ${CMAKE_CURRENT_BINARY_DIR}/sysroot/usr/include)
#
# foreach (platform_include_dir ${photon_platform_extra_include_dirs})
#     bundle_include_directories(photon
#         ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/${platform_include_dir})
# endforeach (platform_include_dir)
#
#
# bundle_add_dependencies(photon local-root crt)
#
# add_custom_command(TARGET photon POST_BUILD
#     COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/scripts/add-framework-crt.sh
#         ${BUNDLE_PROGRAM}
#         ${CMAKE_CURRENT_BINARY_DIR}/photon.framework
#         ${CMAKE_CURRENT_BINARY_DIR})
#
# if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
#     bundle_link_libraries(photon gcc)
# endif ()
#
# if (TARGET early-sysroot)
#     # We are being built as part of asbestOS, make sure the sysroot is there.
#     bundle_add_dependencies(photon early-sysroot)
# endif ()
#
# if (PHOTON_TESTS EQUAL 1)
#     add_subdirectory(tests)
# endif ()