cmake_minimum_required(VERSION 3.6)

project(
    GekkoFS
    VERSION 0.8.0
)

enable_testing()

if(NOT CMAKE_COMPILER_IS_GNUCC)
    message(FATAL_ERROR "The choosen C compiler is not gcc and is not supported")
endif()
if(NOT CMAKE_COMPILER_IS_GNUCXX)
    message(FATAL_ERROR "The choosen C++ compiler is not g++ and is not supported")
endif()

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)

if (NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE Release
            CACHE STRING "Choose the type of build: Debug Release Memcheck" FORCE)
ENDIF (NOT CMAKE_BUILD_TYPE)
message(STATUS "[gekkofs] Build type: ${CMAKE_BUILD_TYPE}")

# Compiler flags for various cmake build types
set(WARNINGS_FLAGS "-Wall -Wextra --pedantic -Wno-unused-parameter -Wno-missing-field-initializers")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -DNDEBUG -O3")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${WARNINGS_FLAGS} -g -O0 -DGKFS_DEBUG_BUILD -DHERMES_DEBUG_BUILD")
set(CMAKE_CXX_FLAGS_MEMCHECK "${WARNINGS_FLAGS} -g -O0 -fsanitize=address -fno-omit-frame-pointer")
set(CMAKE_CXX_FLAGS_MAINTAINER "${WARNINGS_FLAGS} -g -O0 -pg -no-pie")
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -DNDEBUG -O3")
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${WARNINGS_FLAGS} -g -O0 -DGKFS_DEBUG_BUILD")
set(CMAKE_C_FLAGS_MEMCHECK "${WARNINGS_FLAGS} -g -O0 -fsanitize=address -fno-omit-frame-pointer")
set(CMAKE_C_FLAGS_MAINTAINER "${WARNINGS_FLAGS} -g -O0 -pg -no-pie")
mark_as_advanced(CMAKE_CXX_FLAGS_MAINTAINER)

# Project version
set(GIT_VERSION_FOUND FALSE)
if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.git)
    find_package(Git)
    if(Git_FOUND)
        execute_process(COMMAND /bin/bash -c "${GIT_EXECUTABLE} describe --tags --match='v*.*.*' --long --dirty"
                        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
                        RESULT_VARIABLE GIT_RET
                        OUTPUT_VARIABLE GIT_VERSION
                        ERROR_VARIABLE GIT_ERR
                        OUTPUT_STRIP_TRAILING_WHITESPACE
                        )
        if("${GIT_RET}" STREQUAL "0")
            string(REGEX MATCH
                   "^v([0-9]+)\.([0-9]+)\.([0-9]+)-([0-9]+)-(.*)$"
                   DROP ${GIT_VERSION})
            set(PROJECT_VERSION_MAJOR ${CMAKE_MATCH_1})
            set(PROJECT_VERSION_MINOR ${CMAKE_MATCH_2})
            set(PROJECT_VERSION_PATCH ${CMAKE_MATCH_3})
            set(GKFS_COMMIT_GAP ${CMAKE_MATCH_4})
            set(GKFS_COMMIT_HASH ${CMAKE_MATCH_5})
            set(PROJECT_VERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}-snapshot+${GKFS_COMMIT_GAP}-${GKFS_COMMIT_HASH}")
            set(GIT_VERSION_FOUND TRUE)
        else()
            message(WARNING "Failed to run `git describe`: [${GIT_RET}] '${GIT_ERR}'")
        endif()
    endif()
endif()
message(STATUS "[gekkofs] Project version: ${PROJECT_VERSION}")
set(GKFS_VERSION_MAJOR ${PROJECT_VERSION_MAJOR})
set(GKFS_VERSION_MINOR ${PROJECT_VERSION_MINOR})
set(GKFS_VERSION_PATCH ${PROJECT_VERSION_PATCH})
set(GKFS_VERSION_STRING ${PROJECT_VERSION})
configure_file(include/version.hpp.in include/version.hpp)

set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/CMake" ${CMAKE_MODULE_PATH})

set(CMAKE_EXPORT_COMPILE_COMMANDS 0)

# Rocksdb dependencies
find_package(LZ4 REQUIRED)
find_package(ZLIB REQUIRED)
find_package(BZip2 REQUIRED)
find_package(Snappy REQUIRED)
find_package(ZStd REQUIRED)
find_package(JeMalloc) # required if rocksdb has been build with jemalloc
find_package(RocksDB REQUIRED)
# margo dependencies
find_package(Mercury REQUIRED)
find_package(Abt REQUIRED)
find_package(Margo REQUIRED)
find_package(Syscall_intercept REQUIRED)

# boost dependencies, system is required for filesystem
find_package(Boost 1.53 REQUIRED
    COMPONENTS
    filesystem
    program_options
    )

find_package(Threads REQUIRED)

find_package(Date REQUIRED)

option(CREATE_CHECK_PARENTS "Check parent directory existance before creating child node" ON)
message(STATUS "[gekkofs] Create checks parents: ${CREATE_CHECK_PARENTS}")

option(SYMLINK_SUPPORT "Compile with support for symlinks" ON)
if(SYMLINK_SUPPORT)
    add_definitions(-DHAS_SYMLINKS)
endif()
message(STATUS "[gekkofs] Symlink support: ${SYMLINK_SUPPORT}")

set(MAX_INTERNAL_FDS 256 CACHE STRING "Number of file descriptors reserved for internal use")
add_definitions(-DMAX_INTERNAL_FDS=${MAX_INTERNAL_FDS})
message(STATUS "[gekkofs] File descriptors reserved for internal use: ${MAX_INTERNAL_FDS}")

execute_process(COMMAND getconf OPEN_MAX
                OUTPUT_VARIABLE GETCONF_MAX_FDS
                OUTPUT_STRIP_TRAILING_WHITESPACE
                ERROR_QUIET)
if(NOT GETCONF_MAX_FDS)
    set(GETCONF_MAX_FDS=512)
endif()
add_definitions(-DMAX_OPEN_FDS=${GETCONF_MAX_FDS})

option(ENABLE_CLIENT_LOG "Enable logging messages" ON)
if(ENABLE_CLIENT_LOG)
    add_definitions(-DGKFS_ENABLE_LOGGING)
endif()
message(STATUS "[gekkofs] Client logging output: ${ENABLE_CLIENT_LOG}")

option(GKFS_ENABLE_FORWARDING "Enable forwarding mode" OFF)
option(GKFS_ENABLE_AGIOS "Enable AGIOS scheduling library" OFF)
if (GKFS_ENABLE_AGIOS)
    find_package(AGIOS REQUIRED)
endif ()


set(CLIENT_LOG_MESSAGE_SIZE 1024 CACHE STRING "Maximum size of a log message in the client library")
add_definitions(-DLIBGKFS_LOG_MESSAGE_SIZE=${CLIENT_LOG_MESSAGE_SIZE})
message(STATUS "[gekkofs] Maximum log message size in the client library: ${CLIENT_LOG_MESSAGE_SIZE}")
mark_as_advanced(CLIENT_LOG_MESSAGE_SIZE)

configure_file(include/global/cmake_configure.hpp.in include/global/cmake_configure.hpp)

# Imported target
add_library(RocksDB INTERFACE IMPORTED GLOBAL)
target_link_libraries(RocksDB
    INTERFACE
    ${ROCKSDB_LIBRARIES}
    # rocksdb libs
    ${Snappy_LIBRARIES}
    ${ZLIB_LIBRARIES}
    ${BZIP2_LIBRARIES}
    ${ZSTD_LIBRARIES}
    ${LZ4_LIBRARIES}
)

if(${JeMalloc_FOUND})
    target_link_libraries(RocksDB
        INTERFACE
        ${JEMALLOC_LIBRARIES}
    )
endif()
# we cannot use target_include_directories with CMake < 3.11
set_target_properties(RocksDB
    PROPERTIES
    INTERFACE_INCLUDE_DIRECTORIES ${ROCKSDB_INCLUDE_DIRS}
)

add_library(spdlog INTERFACE)
# we cannot use target_include_directories with CMake < 3.11
set_target_properties(spdlog
    PROPERTIES
    INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_SOURCE_DIR}/external"
)

add_subdirectory(external/fmt)
set_property(TARGET fmt PROPERTY POSITION_INDEPENDENT_CODE ON)

if(ENABLE_CLIENT_LOG)
    option(HERMES_LOGGING "" ON)
    option(HERMES_LOGGING_FMT_USE_BUNDLED "" OFF)
    option(HERMES_LOGGING_FMT_HEADER_ONLY "" OFF)
endif()

option(HERMES_MARGO_COMPATIBLE_RPCS "" ON)
add_subdirectory(external/hermes)
target_compile_definitions(hermes INTERFACE)

set(INCLUDE_DIR "${CMAKE_SOURCE_DIR}/include")

# define include directories that are relevant for all targets
include_directories(
    ${INCLUDE_DIR}
    ${CMAKE_BINARY_DIR}/include
)

include(GNUInstallDirs)
include(CheckSymbolExists)

check_cxx_source_compiles("
    #include <fcntl.h>
    #include <sys/stat.h>

    int main() {
        struct statx buf;
        statx(AT_FDCWD, \"/foo\", AT_EMPTY_PATH, STATX_BASIC_STATS, &buf);
        return 0;
    }
" GLIBC_HAS_STATX)

# Global components
add_subdirectory(src/global)
# Daemon
add_subdirectory(src/daemon)
# Client library
add_subdirectory(src/client)

option(GKFS_BUILD_TESTS "Build GekkoFS self tests" OFF)

include(CMakeDependentOption)
cmake_dependent_option(GKFS_INSTALL_TESTS "Install GekkoFS self tests" OFF "GKFS_BUILD_TESTS" OFF)

if(GKFS_BUILD_TESTS)
    message(STATUS "[gekkofs] Preparing tests...")
    set(GKFS_TESTS_INTERFACE "lo" CACHE STRING "Network interface to use when running tests (default: lo)")
    message(STATUS "[gekkofs] Network interface for tests: ${GKFS_TESTS_INTERFACE}")

    message(STATUS "[gekkofs] Check for forwarding tests...")
    if(ENABLE_FORWARDING)
        set(GKFS_TESTS_FORWARDING "ON" CACHE STRING "Enable I/O forwarding tests (default: OFF)")
    else()
        set(GKFS_TESTS_FORWARDING "OFF" CACHE STRING "Enable I/O forwarding tests (default: OFF)")
    endif()
    message(STATUS "[gekkofs] Forwarding tests: ${GKFS_TESTS_FORWARDING}")

    add_subdirectory(tests)
else()
    unset(GKFS_TESTS_INTERFACE CACHE)
endif()