cmake_minimum_required(VERSION 3.9)
project(collocatordb VERSION 1.7.0 DESCRIPTION "Storing and retrieving collocation counts based on RocksDB")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -fno-rtti")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g")

# RocksDB requires C++17 since version 7 and C++20 since version 11, so use the
# newest standard the compiler knows. Nothing here depends on it, this only has
# to satisfy the rocksdb headers.
if ("cxx_std_20" IN_LIST CMAKE_CXX_COMPILE_FEATURES)
    set(CMAKE_CXX_STANDARD 20)
else()
    set(CMAKE_CXX_STANDARD 17)
endif()
set(CMAKE_CXX_STANDARD_REQUIRED ON)

include(GNUInstallDirs)

# The RPATH to be used when installing, but only if it is not a system
# directory. CMAKE_INSTALL_FULL_LIBDIR rather than a hard coded lib: the library
# goes to lib64 on Fedora, Rocky Linux and RHEL, and to lib/<triplet> on Debian
# and Ubuntu, and an installation below /usr/local is in the search path of the
# loader on none of them by default.
list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_FULL_LIBDIR}" isSystemDir)
if("${isSystemDir}" STREQUAL "-1")
    set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_FULL_LIBDIR}")
endif("${isSystemDir}" STREQUAL "-1")

configure_file(src/config.h.in ${CMAKE_CURRENT_BINARY_DIR}/config.h @ONLY)
include_directories(/usr/local/include /opt/homebrew/include ${CMAKE_CURRENT_BINARY_DIR} build)
link_directories(/usr/local/lib64 /usr/local/lib /usr/lib64 /usr/lib /opt/homebrew/lib)
if (1 AND APPLE)
       message("MacOS deteted")
       set(LIBRT "")
       find_library(ROCKSDB NAMES librocksdb.a)
       set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -flat_namespace")
       set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -flat_namespace")
else()
       set(LIBRT "rt")
       # No version pin, so that the rocksdb of the distribution can be used.
       # Only shared libraries, the static one is picked up as ROCKSDB_STATIC
       # below. Set -DROCKSDB=<path> to choose a specific one, and make sure the
       # headers that are found belong to it, i.e. that there is no leftover
       # rocksdb installation below /usr/local.
       set(_collocatordb_lib_suffixes ${CMAKE_FIND_LIBRARY_SUFFIXES})
       set(CMAKE_FIND_LIBRARY_SUFFIXES ${CMAKE_SHARED_LIBRARY_SUFFIX})
       find_library(ROCKSDB NAMES rocksdb)
       set(CMAKE_FIND_LIBRARY_SUFFIXES ${_collocatordb_lib_suffixes})
endif()
if (NOT ROCKSDB)
    message(FATAL_ERROR
            "No rocksdb found. Install the development package of the "
            "distribution, e.g. librocksdb-dev or rocksdb-devel. Where there is "
            "none, build rocksdb and say where it is: "
            "-DCMAKE_PREFIX_PATH=<prefix it was installed to>. Without this the "
            "shared library would be built with unresolved rocksdb symbols, "
            "which only shows up when something links it.")
endif()
message(STATUS "Using RocksDB library ${ROCKSDB}")

# The headers have to belong to that library. Looked up rather than assumed, so
# that CMAKE_PREFIX_PATH also works for a rocksdb that was built by hand, and
# put before the rest, so that a leftover rocksdb below /usr/local cannot
# shadow it - the compiler looks into /usr/local/include before /usr/include.
find_path(ROCKSDB_INCLUDE_DIR rocksdb/version.h)
if (ROCKSDB_INCLUDE_DIR)
    include_directories(BEFORE ${ROCKSDB_INCLUDE_DIR})
endif()
if (ROCKSDB_INCLUDE_DIR AND ROCKSDB)
    file(STRINGS "${ROCKSDB_INCLUDE_DIR}/rocksdb/version.h" _rocksdb_major_line
         REGEX "^#define ROCKSDB_MAJOR ")
    string(REGEX MATCH "[0-9]+" ROCKSDB_HEADER_MAJOR "${_rocksdb_major_line}")
    get_filename_component(_rocksdb_real "${ROCKSDB}" REALPATH)
    if (_rocksdb_real MATCHES "librocksdb\\.so\\.([0-9]+)")
        set(ROCKSDB_LIB_MAJOR ${CMAKE_MATCH_1})
        message(STATUS "Using RocksDB headers ${ROCKSDB_INCLUDE_DIR} (version ${ROCKSDB_HEADER_MAJOR})")
        if (NOT ROCKSDB_HEADER_MAJOR STREQUAL ROCKSDB_LIB_MAJOR)
            message(FATAL_ERROR
                    "The rocksdb headers in ${ROCKSDB_INCLUDE_DIR} are version "
                    "${ROCKSDB_HEADER_MAJOR}, but ${ROCKSDB} is version "
                    "${ROCKSDB_LIB_MAJOR}. Most likely a leftover rocksdb below "
                    "/usr/local shadows the one of the distribution - remove it, "
                    "or point -DROCKSDB= at the library belonging to the headers.")
        endif()
    endif()
endif()

find_library(ROCKSDB_STATIC librocksdb.a)

get_cmake_property(_variableNames VARIABLES)
list (SORT _variableNames)
foreach (_variableName ${_variableNames})
    message(STATUS "${_variableName}=${${_variableName}}")
endforeach()

enable_testing()
add_library(collocatordb SHARED src/collocatordb.cc)

target_link_libraries(collocatordb pthread ${LIBRT} snappy z bz2 lz4 zstd ${ROCKSDB} dl)

set_target_properties(collocatordb PROPERTIES
        VERSION ${PROJECT_VERSION}
        SOVERSION 1
        PUBLIC_HEADER src/collocatordb.h)

add_library(collocatordb_static STATIC src/collocatordb.cc)
# Distributions usually package rocksdb as a shared library only, in which case
# the static collocatordb is linked against that one.
if (ROCKSDB_STATIC)
    set(ROCKSDB_FOR_STATIC ${ROCKSDB_STATIC})
else()
    set(ROCKSDB_FOR_STATIC ${ROCKSDB})
    message(STATUS "No static rocksdb found, linking collocatordb_static against ${ROCKSDB}")
endif()
target_link_libraries(collocatordb_static ${ROCKSDB_FOR_STATIC} pthread ${LIBRT} snappy z bz2 lz4 zstd dl)

add_executable(basic_test tests/basic_test.c tests/acutest.h)
TARGET_LINK_LIBRARIES(basic_test ${ROCKSDB} collocatordb)
add_test(BASIC_TEST basic_test)

add_executable(static_library_test tests/basic_test.c tests/acutest.h)
TARGET_LINK_LIBRARIES(static_library_test collocatordb_static)
add_test(STATIC_LIBRARY_TEST static_library_test)

# Install library
install(TARGETS ${PROJECT_NAME} collocatordb_static
                LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
                ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
                PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})

if (1 AND APPLE)
    add_custom_command(TARGET collocatordb POST_BUILD
        COMMAND install_name_tool -id "/usr/local/lib/libcollocatordb.1.dylib" $<TARGET_FILE:collocatordb>)
endif()

file(GLOB TOOLS_SOURCES tools/*.c tools/*.cc)
add_custom_target(tools)
foreach(TOOL_SOURCE ${TOOLS_SOURCES})
    get_filename_component(TOOL_NAME ${TOOL_SOURCE} NAME_WE)
    add_executable(${TOOL_NAME} ${TOOL_SOURCE})
    target_link_libraries(${TOOL_NAME} ${ROCKSDB} collocatordb)
    set_target_properties(${TOOL_NAME} PROPERTIES
            INSTALL_RPATH "${CMAKE_INSTALL_FULL_LIBDIR}"
            BUILD_WITH_INSTALL_RPATH TRUE)
    add_dependencies(tools ${TOOL_NAME})
    install(TARGETS ${TOOL_NAME} DESTINATION ${CMAKE_INSTALL_BINDIR})
endforeach()

file(GLOB EXAMPLES_SOURCES examples/*.c examples/*.cc)
add_custom_target(examples)
foreach(EXAMPLE_SOURCE ${EXAMPLES_SOURCES})
    get_filename_component(EXAMPLE_NAME ${EXAMPLE_SOURCE} NAME_WE)
    add_executable(${EXAMPLE_NAME} EXCLUDE_FROM_ALL ${EXAMPLE_SOURCE})
    target_link_libraries(${EXAMPLE_NAME} ${ROCKSDB} collocatordb)
    add_dependencies(examples ${EXAMPLE_NAME})
endforeach()