include(CheckCXXCompilerFlag)
include(CheckFunctionExists)
include(CheckIncludeFiles)
include(CheckLibraryExists)
include(CheckSymbolExists)
include(CheckTypeSize)

function(enable_cxx_compiler_flag_if_supported flag)
    string(FIND "${CMAKE_CXX_FLAGS}" "${flag}" flag_already_set)
    if(flag_already_set EQUAL -1)
        check_cxx_compiler_flag("${flag}" flag_supported)
        if(flag_supported)
            add_compile_options(${flag})
        elseif(flag_supported)
            message(WARNING "unsupported compiler flag: ${flag}")
        endif(flag_supported)
        unset(flag_supported CACHE)
    endif()
endfunction()

# Configures C++11
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(HAVE_CXX11 1)

if(ENABLE_PEDANTIC)
    enable_cxx_compiler_flag_if_supported(-pedantic)
    set(ENABLE_STRICT ON)
endif(ENABLE_PEDANTIC)

if(ENABLE_STRICT)
    set(CMAKE_CXX_EXTENSIONS OFF)
endif(ENABLE_STRICT)

set(CMAKE_POSITION_INDEPENDENT_CODE ON)

# Compiler Options/Macros

# FIXME: These options need to be set on a per object file basis (*.o). Do not belong here.
#        Are these even required? They just modify the Makefile representation of the target.
#add_compile_options(-MD)
#add_compile_options(-MP)
#add_compile_options(-MF)
#add_compile_options(-MT)

# FIXME: [Implement AC_HEADER_STDC]:
# Find a CMake mechanism performs the check as defined in
# AC_HEADER_STDC:
# https://www.gnu.org/software/autoconf/manual/autoconf-2.67/html_node/Particular-Headers.html
#
# Not sure if this is a legacy check, or it's something that we need to
# continue to check with modern compiler versions.
set(STDC_HEADERS 1)

# acx_strict.m4
if(ENABLE_STRICT)
    enable_cxx_compiler_flag_if_supported(-Wall)
    enable_cxx_compiler_flag_if_supported(-Wextra)
endif(ENABLE_STRICT)

# acx_64bit.m4
if(ENABLE_64BIT)
    if(CMAKE_SIZEOF_VOID_P STREQUAL "8")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m64")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m64")
    else(CMAKE_SIZEOF_VOID_P STREQUAL "8")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32")
    endif(CMAKE_SIZEOF_VOID_P STREQUAL "8")
endif(ENABLE_64BIT)

# Equivalent of acx_visibility.m4
if(DISABLE_VISIBILITY)
    message(STATUS "-fvisibility=hidden has been disabled")
else(DISABLE_VISIBILITY)
    set(CRYPTOKI_VISIBILITY 1)
    set(CMAKE_CXX_VISIBILITY_PRESET hidden)
endif(DISABLE_VISIBILITY)

# acx_non_paged_memory.m4
if(DISABLE_NON_PAGED_MEMORY)
    message(STATUS "non-paged-memory disabled")
else(DISABLE_NON_PAGED_MEMORY)
    set(SENSITIVE_NON_PAGE 1)
    check_include_files(sys/mman.h HAVE_SYS_MMAN_H)
    execute_process(COMMAND bash -c "ulimit -l"
                    OUTPUT_VARIABLE MLOCK_SIZE
                    OUTPUT_STRIP_TRAILING_WHITESPACE
                    )
    if(NOT "${MLOCK_SIZE}" STREQUAL "unlimited")
        message(WARNING "\
    ======================================================================
    SoftHSM has been configured to store sensitive data in non-page RAM
    (i.e. memory that is not swapped out to disk). This is the default and
    most secure configuration. Your system, however, is not configured to
    support this model in non-privileged accounts (i.e. user accounts).

    You can check the setting on your system by running the following
    command in a shell:

            ulimit -l

    If this does not return \"unlimited\" and you plan to run SoftHSM from
    non-privileged accounts then you should edit the configuration file
    /etc/security/limits.conf (on most systems).

    You will need to add the following lines to this file:

    #<domain>       <type>          <item>          <value>
    *               -               memlock         unlimited

    Alternatively, you can elect to disable this feature of SoftHSM by
    re-running cmake with the option \"-DDISABLE_NON_PAGED_MEMORY=ON\".
    Please be advised that this may seriously degrade the security of
    SoftHSM.
    ======================================================================")
    endif(NOT "${MLOCK_SIZE}" STREQUAL "unlimited")
endif(DISABLE_NON_PAGED_MEMORY)

# Check if -ldl exists (equivalent of acx_dlopen.m4)
check_library_exists(dl dlopen "" HAVE_DLOPEN)
check_function_exists(LoadLibrary HAVE_LOADLIBRARY)

# acx_libtool.m4
check_include_files(dlfcn.h HAVE_DLFCN_H)

# configure:

# STDC_HEADERS
check_include_files(sys/types.h HAVE_SYS_TYPES_H)
check_include_files(sys/stat.h HAVE_SYS_STAT_H)
check_include_files(stdlib.h HAVE_STDLIB_H)
check_include_files(stddef.h HAVE_STDDEF_H)
check_include_files(string.h HAVE_STRING_H)
check_include_files(strings.h HAVE_STRINGS_H)
check_include_files(inttypes.h HAVE_INTTYPES_H)
check_include_files(stdint.h HAVE_STDINT_H)
check_include_files(unistd.h HAVE_UNISTD_H)

check_include_files(memory.h HAVE_MEMORY_H)
check_include_files(pthread.h HAVE_PTHREAD_H)
check_function_exists(getpwuid_r HAVE_GETPWUID_R)

# Find Botan Crypto Backend
if(WITH_CRYPTO_BACKEND STREQUAL "botan")
    set(WITH_BOTAN 1)

    include(FindBotan)
    if(NOT BOTAN_FOUND)
        message(FATAL_ERROR "Failed to find Botan!")
    endif()

    set(CRYPTO_INCLUDES ${BOTAN_INCLUDE_DIRS})
    set(CRYPTO_LIBS ${BOTAN_LIBRARIES})
    message(STATUS "Botan: Includes: ${CRYPTO_INCLUDES}")
    message(STATUS "Botan: Libs: ${CRYPTO_LIBS}")

    # CXX11 flag is not added to try_run, so set it locally.
    CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
    CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
    set(TMP_CXX_FLAGS ${CMAKE_CXX_FLAGS})
    if(COMPILER_SUPPORTS_CXX11)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
    elseif(COMPILER_SUPPORTS_CXX0X)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
    endif()

    # acx_botan_ecc.m4
    if(ENABLE_ECC)
        set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_botan_ecc.cpp)
        try_run(RUN_ECC COMPILE_RESULT
                "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
                LINK_LIBRARIES ${CRYPTO_LIBS}
                CMAKE_FLAGS
                    "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
                )
        if(COMPILE_RESULT AND RUN_ECC EQUAL 0)
            set(WITH_ECC 1)
            message(STATUS "Botan: Found P-256")
        else()
            set(error_msg "Botan: Cannot find P-256! Botan library has no ECC support!")
            message(FATAL_ERROR ${error_msg})
        endif()
    else(ENABLE_ECC)
        message(STATUS "Botan: Support for ECC is disabled")
    endif(ENABLE_ECC)

    # acx_botan_eddsa.m4
    if(ENABLE_EDDSA)
        # ED25519
        set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_botan_ed25519.cpp)
        try_run(RUN_ED25519 COMPILE_RESULT
                "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
                LINK_LIBRARIES ${CRYPTO_LIBS}
                CMAKE_FLAGS
                    "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
                )
        if(COMPILE_RESULT AND RUN_ED25519 EQUAL 0)
            set(WITH_EDDSA 1)
            message(STATUS "Botan: Found ED25519")
        else()
            set(error_msg "Botan: Cannot find ED25519! Botan library has no EDDSA support!")
            message(FATAL_ERROR ${error_msg})
        endif()
    else(ENABLE_EDDSA)
        message(STATUS "Botan: Support for EDDSA is disabled")
    endif(ENABLE_EDDSA)

    # acx_botan_gost.m4
    if(ENABLE_GOST)
        set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_botan_gost.cpp)
        try_run(RUN_GOST COMPILE_RESULT
                "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
                LINK_LIBRARIES ${CRYPTO_LIBS}
                CMAKE_FLAGS
                    "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
                )
        if(COMPILE_RESULT AND RUN_GOST EQUAL 0)
            set(WITH_GOST 1)
            message(STATUS "Botan: Found GOST")
        else()
            set(error_msg "Botan: Cannot find GOST! Botan library has no GOST support!")
            message(FATAL_ERROR ${error_msg})
        endif()
    else(ENABLE_GOST)
        message(STATUS "Botan: Support for GOST is disabled")
    endif(ENABLE_GOST)

    if(ENABLE_FIPS)
        message(FATAL_ERROR "Botan does not support FIPS 140-2 mode")
    endif(ENABLE_FIPS)

    # Compile with AES KEY WRAP
    set(HAVE_AES_KEY_WRAP 1)

    # acx_botan_rfc5649.m4
    set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_botan_rfc5649.cpp)
    try_run(RUN_AES_KEY_WRAP_PAD COMPILE_RESULT
            "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
            LINK_LIBRARIES ${CRYPTO_LIBS}
            CMAKE_FLAGS
                "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
            )
    if(COMPILE_RESULT AND RUN_AES_KEY_WRAP_PAD EQUAL 0)
        set(HAVE_AES_KEY_WRAP_PAD 1)
        message(STATUS "Botan: RFC 5649 is supported")
    else()
        message(STATUS "Botan: RFC 5649 is not supported")
    endif()

    # acx_botan_rawpss.m4
    set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_botan_rawpss.cpp)
    try_run(RUN_RAWPSS COMPILE_RESULT
            "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
            LINK_LIBRARIES ${CRYPTO_LIBS}
            CMAKE_FLAGS
                "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
            )
    if(COMPILE_RESULT AND RUN_RAWPSS EQUAL 0)
        set(WITH_RAW_PSS 1)
        message(STATUS "Botan: Found raw PSS")
    else()
        message(STATUS "Botan: Cannot find raw PSS support, upgrade to Botan >= v2.3.0")
    endif()

    # acx_botan_aes_gcm.m4
    set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_botan_aes_gcm.cpp)
    try_run(RUN_AESGCM COMPILE_RESULT
            "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
            LINK_LIBRARIES ${CRYPTO_LIBS}
            CMAKE_FLAGS
                "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
            )
    if(COMPILE_RESULT AND RUN_AESGCM EQUAL 0)
        set(WITH_AES_GCM 1)
        message(STATUS "Botan: Found AES GCM")
    else()
        message(STATUS "Botan: Cannot find AES GCM support, upgrade to Botan >= v2.0.0")
    endif()

    # Restore flags
    set(CMAKE_CXX_FLAGS ${TMP_CXX_FLAGS})

# Find OpenSSL Crypto Backend
elseif(WITH_CRYPTO_BACKEND STREQUAL "openssl")
    set(WITH_OPENSSL 1)

    include(FindOpenSSL)
    if(NOT OPENSSL_FOUND)
        message(FATAL_ERROR "Failed to find OpenSSL!")
    endif()

    set(CRYPTO_INCLUDES ${OPENSSL_INCLUDE_DIR})
    set(CRYPTO_LIBS ${OPENSSL_LIBRARIES})
    message(STATUS "OpenSSL: Found version ${OPENSSL_VERSION}")
    message(STATUS "OpenSSL: Includes: ${CRYPTO_INCLUDES}")
    message(STATUS "OpenSSL: Libs: ${CRYPTO_LIBS}")

    check_include_files(openssl/ssl.h HAVE_OPENSSL_SSL_H)
    get_filename_component(CRYPTO_LIB_DIR "${OPENSSL_CRYPTO_LIBRARY}" DIRECTORY)
    check_library_exists(crypto "BN_new" "${CRYPTO_LIB_DIR}" HAVE_LIBCRYPTO)

    # acx_openssl_ecc.m4
    if(ENABLE_ECC)
        set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_openssl_ecc.c)
        try_run(RUN_ECC COMPILE_RESULT
                "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
                LINK_LIBRARIES ${CRYPTO_LIBS}
                CMAKE_FLAGS
                    "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
                )
        if(COMPILE_RESULT AND RUN_ECC EQUAL 0)
            set(WITH_ECC 1)
            message(STATUS "OpenSSL: Found P-256, P-384, and P-521")
        else()
            set(error_msg "OpenSSL: Cannot find P-256, P-384, or P-521! OpenSSL library has no ECC support!")
            message(FATAL_ERROR ${error_msg})
        endif()
    else(ENABLE_ECC)
        message(STATUS "OpenSSL: Support for ECC is disabled")
    endif(ENABLE_ECC)

    # acx_openssl_eddsa.m4
    if(ENABLE_EDDSA)
        # ED25519
        set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_openssl_ed25519.c)
        try_run(RUN_ED25519 COMPILE_RESULT
                "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
                LINK_LIBRARIES ${CRYPTO_LIBS}
                CMAKE_FLAGS
                    "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
                )
        if(COMPILE_RESULT AND RUN_ED25519 EQUAL 0)
            set(WITH_EDDSA 1)
            message(STATUS "OpenSSL: Found ED25519")
        else()
            set(error_msg "OpenSSL: Cannot find ED25519! OpenSSL library has no EDDSA support!")
            message(FATAL_ERROR ${error_msg})
        endif()
        # ED448
        set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_openssl_ed448.c)
        try_run(RUN_ED448 COMPILE_RESULT
                "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
                LINK_LIBRARIES ${CRYPTO_LIBS}
                CMAKE_FLAGS
                    "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
                )
        if(COMPILE_RESULT AND RUN_ED448 EQUAL 0)
            message(STATUS "OpenSSL: Found ED448")
        else()
            # Not used in SoftHSM
            message(STATUS "OpenSSL: Cannot find ED448!")
        endif()
    else(ENABLE_EDDSA)
        message(STATUS "OpenSSL: Support for EDDSA is disabled")
    endif(ENABLE_EDDSA)

    # acx_openssl_gost.m4
    if(ENABLE_GOST)
        set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_openssl_gost.c)
        try_run(RUN_GOST COMPILE_RESULT
                "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
                LINK_LIBRARIES ${CRYPTO_LIBS}
                CMAKE_FLAGS
                    "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
                )
        if(COMPILE_RESULT AND RUN_GOST EQUAL 0)
            set(WITH_GOST 1)
            message(STATUS "OpenSSL: Found GOST engine")
        else()
            set(error_msg "OpenSSL: Cannot find GOST engine! OpenSSL library has no GOST support!")
            message(FATAL_ERROR ${error_msg})
        endif()
    else(ENABLE_GOST)
        message(STATUS "OpenSSL: Support for GOST is disabled")
    endif(ENABLE_GOST)

    # acx_openssl_fips.m4
    if(ENABLE_FIPS)
        set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_openssl_fips.c)
        try_run(RUN_FIPS COMPILE_RESULT
                "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
                LINK_LIBRARIES ${CRYPTO_LIBS}
                CMAKE_FLAGS
                    "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
                )
        if(COMPILE_RESULT AND RUN_FIPS EQUAL 0)
            set(WITH_FIPS 1)
            message(STATUS "OpenSSL: Found working FIPS_mode_set()")
        else()
            set(error_msg "OpenSSL: FIPS_mode_set(1) failed. OpenSSL library is not FIPS capable!")
            message(FATAL_ERROR ${error_msg})
        endif()
    else(ENABLE_FIPS)
        message(STATUS "OpenSSL: Support for FIPS 140-2 mode is disabled")
    endif(ENABLE_FIPS)

    # acx_openssl_rfc3349
    set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_openssl_rfc3394.c)
    try_run(RUN_AES_KEY_WRAP COMPILE_RESULT
            "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
            LINK_LIBRARIES ${CRYPTO_LIBS}
            CMAKE_FLAGS
                "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
            )
    if(COMPILE_RESULT AND RUN_AES_KEY_WRAP EQUAL 0)
        set(HAVE_AES_KEY_WRAP 1)
        message(STATUS "OpenSSL: RFC 3394 is supported")
    else()
        message(STATUS "OpenSSL: RFC 3394 is not supported")
    endif()

    # acx_openssl_rfc5649
    set(testfile ${CMAKE_SOURCE_DIR}/modules/tests/test_openssl_rfc5649.c)
    try_run(RUN_AES_KEY_WRAP_PAD COMPILE_RESULT
            "${CMAKE_BINARY_DIR}/prebuild_santity_tests" ${testfile}
            LINK_LIBRARIES ${CRYPTO_LIBS}
            CMAKE_FLAGS
                "-DINCLUDE_DIRECTORIES=${CRYPTO_INCLUDES}"
            )
    if(COMPILE_RESULT AND RUN_AES_KEY_WRAP_PAD EQUAL 0)
        set(HAVE_AES_KEY_WRAP_PAD 1)
        message(STATUS "OpenSSL: RFC 5649 is supported")
    else()
        message(STATUS "OpenSSL: RFC 5649 is not supported")
    endif()

    # Compile with RAW PKCS PSS
    set(WITH_RAW_PSS 1)
    # Compile with AES_GCM
    set(WITH_AES_GCM 1)

else()
    message(FATAL_ERROR "Crypto backend '${WITH_CRYPTO_BACKEND}' not supported. Use openssl or botan.")
endif()

# Find SQLite3
if(WITH_SQLITE3)
    include(FindSQLite3)
    if(NOT SQLITE3_FOUND)
        message(FATAL_ERROR "Failed to find SQLite3!")
    endif(NOT SQLITE3_FOUND)

    set(SQLITE3_INCLUDES ${SQLITE3_INCLUDE_DIRS})
    set(SQLITE3_LIBS ${SQLITE3_LIBRARIES})
    message(STATUS "SQLite3: Includes: ${SQLITE3_INCLUDES}")
    message(STATUS "SQLite3: Libs: ${SQLITE3_LIBS}")

    check_include_files(sqlite3.h HAVE_SQLITE3_H)
    check_library_exists(sqlite3 sqlite3_prepare_v2 "" HAVE_LIBSQLITE3)
    find_program(SQLITE3_COMMAND NAMES sqlite3)
    if(SQLITE3_COMMAND MATCHES "-NOTFOUND")
        message(FATAL_ERROR "SQLite3: Command was not found")
    endif(SQLITE3_COMMAND MATCHES "-NOTFOUND")
else(WITH_SQLITE3)
    message(STATUS "Not including SQLite3 in build")
endif(WITH_SQLITE3)

# acx_p11kit.m4
if(ENABLE_P11_KIT)
    if("${WITH_P11_KIT}" STREQUAL "")
        find_package(PkgConfig)
        if(PKG_CONFIG_FOUND)
            function(pkg_check_variable _pkg _name)
                string(TOUPPER ${_pkg} _pkg_upper)
                string(TOUPPER ${_name} _name_upper)
                string(REPLACE "-" "_" _pkg_upper ${_pkg_upper})
                string(REPLACE "-" "_" _name_upper ${_name_upper})
                set(_output_name "${_pkg_upper}_${_name_upper}")

                execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --variable=${_name} ${_pkg} OUTPUT_VARIABLE _pkg_result OUTPUT_STRIP_TRAILING_WHITESPACE)
                set("${_output_name}" "${_pkg_result}" CACHE STRING "pkg-config variable ${_name} of ${_pkg}")
            endfunction()
            pkg_check_modules(PC_p11kit QUIET p11-kit-1)
            pkg_check_variable(p11-kit-1 p11_module_configs)
            set(P11KIT_PATH ${P11_KIT_1_P11_MODULE_CONFIGS})
        endif(PKG_CONFIG_FOUND)
    else()
        set(P11KIT_PATH ${WITH_P11_KIT})
    endif()
    message(STATUS "P11-kit: Install path: ${P11KIT_PATH}")
    if("${P11KIT_PATH}" STREQUAL "")
        message(WARNING "P11-kit: Missing install path for the p11-kit module, skipping module")
        SET(ENABLE_P11_KIT OFF)
    endif()
else(ENABLE_P11_KIT)
    message(STATUS "P11-kit: No integration")
endif(ENABLE_P11_KIT)

if(BUILD_TESTS)
    # Find CppUnit (equivalent of acx_cppunit.m4)
    set(CppUnit_FIND_QUIETLY ON)
    include(FindCppUnit)
    if(NOT CPPUNIT_FOUND)
        message(FATAL_ERROR "Failed to find CppUnit!")
    endif(NOT CPPUNIT_FOUND)

    set(CPPUNIT_INCLUDES ${CPPUNIT_INCLUDE_DIR})
    set(CPPUNIT_LIBS ${CPPUNIT_LIBRARY})
    message(STATUS "CppUnit: Includes: ${CPPUNIT_INCLUDES}")
    message(STATUS "CppUnit: Libs: ${CPPUNIT_LIBS}")
else(BUILD_TESTS)
    message(STATUS "Not building tests")
endif(BUILD_TESTS)

configure_file(config.h.in.cmake ${CMAKE_BINARY_DIR}/config.h)