cmake_minimum_required(VERSION 3.9)
project(openssl C)

if(NOT SOURCE_PATH)
    message(FATAL_ERROR "Requires SOURCE_PATH")
endif()

if(CMAKE_SYSTEM_NAME STREQUAL "Android")
    set(PLATFORM android)
elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
    if(CMAKE_SYSTEM_PROCESSOR STREQUAL "AMD64")
        set(PLATFORM linux-generic64)
    else()
        set(PLATFORM linux-generic32)
    endif()
elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
    set(PLATFORM darwin64-x86_64-cc)
elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
    set(PLATFORM BSD-generic64)
else()
    message(FATAL_ERROR "Unknown platform")
endif()

get_filename_component(COMPILER_ROOT "${CMAKE_C_COMPILER}" DIRECTORY)

message("CMAKE_C_COMPILER=${CMAKE_C_COMPILER}")
message("COMPILER_ROOT=${COMPILER_ROOT}")
message("CMAKE_SYSROOT=${CMAKE_SYSROOT}")
message("CMAKE_C_FLAGS=${CMAKE_C_FLAGS}")
message("CMAKE_C_FLAGS_RELEASE=${CMAKE_C_FLAGS_RELEASE}")
message("CMAKE_C_FLAGS_DEBUG=${CMAKE_C_FLAGS_DEBUG}")
message("CMAKE_INCLUDE_SYSTEM_FLAG_C=${CMAKE_INCLUDE_SYSTEM_FLAG_C}")

set(CFLAGS "${CMAKE_C_FLAGS}")
if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
    set(CFLAGS "-Wno-error=unused-command-line-argument ${CMAKE_C_FLAGS}")
endif()
if(CMAKE_C_COMPILER_TARGET)
    set(CFLAGS "${CFLAGS} ${CMAKE_C_COMPILE_OPTIONS_TARGET} ${CMAKE_C_COMPILER_TARGET}")
endif()
if(CMAKE_C_COMPILER_EXTERNAL_TOOLCHAIN)
    set(CFLAGS "${CFLAGS} ${CMAKE_C_COMPILE_OPTIONS_EXTERNAL_TOOLCHAIN} ${CMAKE_C_COMPILER_EXTERNAL_TOOLCHAIN}")
endif()
if(CMAKE_SYSROOT AND CMAKE_C_COMPILE_OPTIONS_SYSROOT)
    set(CFLAGS "${CFLAGS} ${CMAKE_C_COMPILE_OPTIONS_SYSROOT}${CMAKE_SYSROOT}")
endif()

string(REGEX REPLACE "^ " "" CFLAGS "${CFLAGS}")

if(CMAKE_HOST_WIN32)
    file(TO_NATIVE_PATH ENV_PATH "${COMPILER_ROOT};$ENV{PATH}")
else()
    file(TO_NATIVE_PATH ENV_PATH "${COMPILER_ROOT}:$ENV{PATH}")
endif()
set(ENV{ANDROID_DEV} "${CMAKE_SYSROOT}/usr")
set(ENV{CC} "${CMAKE_C_COMPILER}")

message("ENV{ANDROID_DEV}=$ENV{ANDROID_DEV}")

get_filename_component(SOURCE_PATH_NAME "${SOURCE_PATH}" NAME)
set(BUILDDIR "${CMAKE_CURRENT_BINARY_DIR}/${SOURCE_PATH_NAME}")

if(NOT EXISTS "${BUILDDIR}")
    file(COPY ${SOURCE_PATH} DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
endif()

get_filename_component(MSYS_BIN_DIR "${MAKE}" DIRECTORY)


file(READ "${BUILDDIR}/Configure" _contents)
string(REPLACE "-mandroid" "" _contents "${_contents}")
file(WRITE "${BUILDDIR}/Configure" "${_contents}")

if(BUILD_SHARED_LIBS)
    set(SHARED shared)
else()
    set(SHARED no-shared)
endif()

if(CMAKE_HOST_WIN32)
    set(ENV_COMMAND set)
    set(PATH_VAR ";%PATH%")
else()
    set(ENV_COMMAND export)
    set(PATH_VAR ":$ENV{PATH}")
endif()

add_custom_command(
    OUTPUT "${BUILDDIR}/Makefile"
    COMMAND ${ENV_COMMAND} CC=${CMAKE_C_COMPILER}
    COMMAND ${ENV_COMMAND} AR=${CMAKE_AR}
    COMMAND ${ENV_COMMAND} LD=${CMAKE_LINKER}
    COMMAND ${ENV_COMMAND} RANLIB=${CMAKE_RANLIB}
    COMMAND ${ENV_COMMAND} MAKE=${MAKE}
    COMMAND ${ENV_COMMAND} MAKEDEPPROG=${CMAKE_C_COMPILER}
    COMMAND ${ENV_COMMAND} "PATH=${MSYS_BIN_DIR}${PATH_VAR}"
    COMMAND "${PERL}" Configure
        ${SHARED}
        enable-static-engine
        no-ssl2
        no-krb5
        no-idea
        no-bf
        no-cast
        no-seed
        no-md2
        ${PLATFORM}
        "--prefix=${CMAKE_INSTALL_PREFIX}"
        "--openssldir=${CMAKE_INSTALL_PREFIX}"
        ${CFLAGS}
    COMMAND "${CMAKE_COMMAND}" "-DDIR=${BUILDDIR}" -P "${CMAKE_CURRENT_LIST_DIR}/remove-deps.cmake"
    VERBATIM
    WORKING_DIRECTORY "${BUILDDIR}"
)

add_custom_target(depend
    COMMAND ${ENV_COMMAND} "PATH=${MSYS_BIN_DIR}${PATH_VAR}"
    COMMAND "${MAKE}" links # depend MAKEDEPPROG=${CMAKE_C_COMPILER}
    VERBATIM
    WORKING_DIRECTORY "${BUILDDIR}"
    DEPENDS "${BUILDDIR}/Makefile"
)
add_custom_target(build_libs ALL
    COMMAND ${ENV_COMMAND} "PATH=${MSYS_BIN_DIR}${PATH_VAR}"
    COMMAND "${CMAKE_COMMAND}" -E touch "${BUILDDIR}/krb5.h"
    COMMAND "${MAKE}" build_libs
    VERBATIM
    WORKING_DIRECTORY "${BUILDDIR}"
    DEPENDS depend
    BYPRODUCTS "${BUILDDIR}/libssl.a" "${BUILDDIR}/libcrypto.a"
)

install(
    FILES "${BUILDDIR}/libssl.a" "${BUILDDIR}/libcrypto.a"
    DESTINATION lib
)