cmake_minimum_required(VERSION 3.10)
set(CMAKE_CXX_STANDARD 20)

project(minidb)

MESSAGE(STATUS "This is Project source dir " ${PROJECT_SOURCE_DIR})
MESSAGE(STATUS "This is PROJECT_BINARY_DIR dir " ${PROJECT_BINARY_DIR})

SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)

SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_SOURCE_DIR}/cmake)

OPTION(ENABLE_ASAN "Enable build with address sanitizer" ON)
OPTION(WITH_UNIT_TESTS "Compile miniob with unit tests" ON)
OPTION(CONCURRENCY "Support concurrency operations" OFF)
OPTION(STATIC_STDLIB "Link std library static or dynamic, such as libgcc, libstdc++, libasan" OFF)

MESSAGE(STATUS "HOME dir: $ENV{HOME}")
#SET(ENV{变量名} 值)
IF(WIN32)
    MESSAGE(STATUS "This is windows.")
    ADD_DEFINITIONS(-DWIN32)
ELSEIF(WIN64)
    MESSAGE(STATUS "This is windows.")
    ADD_DEFINITIONS(-DWIN64)
ELSEIF(APPLE)
    MESSAGE(STATUS "This is apple")
    # normally __MACH__ has already been defined
    ADD_DEFINITIONS(-D__MACH__ )
ELSEIF(UNIX)
    MESSAGE(STATUS "This is UNIX")
    ADD_DEFINITIONS(-DUNIX -DLINUX)
ELSE()
    MESSAGE(STATUS "This is UNKNOW OS")
ENDIF(WIN32)

# This is for clangd plugin for vscode
SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS} -Wall -Werror")
IF(DEBUG)
    MESSAGE(STATUS "DEBUG has been set as TRUE ${DEBUG}")
    SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS}  -O0 -g -DDEBUG ")
    ADD_DEFINITIONS(-DENABLE_DEBUG)
ELSEIF(NOT DEFINED ENV{DEBUG})
    MESSAGE(STATUS "Disable debug")
    SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS}  -O2 -g ")
ELSE()
    MESSAGE(STATUS "Enable debug")
    SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS}  -O0 -g -DDEBUG")
    ADD_DEFINITIONS(-DENABLE_DEBUG)
ENDIF(DEBUG)

IF (CONCURRENCY)
    MESSAGE(STATUS "CONCURRENCY is ON")
    SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS} -DCONCURRENCY")
    ADD_DEFINITIONS(-DCONCURRENCY)
ENDIF (CONCURRENCY)

MESSAGE(STATUS "CMAKE_CXX_COMPILER_ID is " ${CMAKE_CXX_COMPILER_ID})
IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND ${STATIC_STDLIB})
    ADD_LINK_OPTIONS(-static-libgcc -static-libstdc++)
ENDIF()

IF (ENABLE_ASAN)
    SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS} -fno-omit-frame-pointer -fsanitize=address")
    IF ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND ${STATIC_STDLIB})
        ADD_LINK_OPTIONS(-static-libasan)
    ENDIF()
ENDIF()

IF (CMAKE_INSTALL_PREFIX)
    MESSAGE(STATUS "CMAKE_INSTALL_PREFIX has been set as " ${CMAKE_INSTALL_PREFIX} )
ELSEIF(DEFINED ENV{CMAKE_INSTALL_PREFIX})
    SET(CMAKE_INSTALL_PREFIX $ENV{CMAKE_INSTALL_PREFIX})
ELSE()
    SET(CMAKE_INSTALL_PREFIX /tmp/${PROJECT_NAME})
ENDIF()
MESSAGE(STATUS "Install target dir is " ${CMAKE_INSTALL_PREFIX})

IF (DEFINED ENV{LD_LIBRARY_PATH})
    SET(LD_LIBRARY_PATH_STR $ENV{LD_LIBRARY_PATH})
    string(REPLACE ":" ";" LD_LIBRARY_PATH_LIST ${LD_LIBRARY_PATH_STR})
    MESSAGE(" Add LD_LIBRARY_PATH to -L flags " ${LD_LIBRARY_PATH_LIST})
    LINK_DIRECTORIES(${LD_LIBRARY_PATH_LIST})
ENDIF ()

IF (EXISTS /usr/local/lib)
    LINK_DIRECTORIES (/usr/local/lib)
ENDIF ()
IF (EXISTS /usr/local/lib64)
    LINK_DIRECTORIES (/usr/local/lib64)
ENDIF ()

INCLUDE_DIRECTORIES(. ${PROJECT_SOURCE_DIR}/deps /usr/local/include)

# ADD_SUBDIRECTORY(src bin)  bin 为目标目录， 可以省略
ADD_SUBDIRECTORY(deps)
ADD_SUBDIRECTORY(src/obclient)
ADD_SUBDIRECTORY(src/observer)
ADD_SUBDIRECTORY(test/perf)
ADD_SUBDIRECTORY(benchmark)
ADD_SUBDIRECTORY(tools)

IF(WITH_UNIT_TESTS)
    SET(CMAKE_COMMON_FLAGS "${CMAKE_COMMON_FLAGS} -fprofile-arcs -ftest-coverage")
    enable_testing()
    ADD_SUBDIRECTORY(unittest)
ENDIF(WITH_UNIT_TESTS)

SET(CMAKE_CXX_FLAGS ${CMAKE_COMMON_FLAGS})
SET(CMAKE_C_FLAGS ${CMAKE_COMMON_FLAGS})
MESSAGE(STATUS "CMAKE_CXX_FLAGS is " ${CMAKE_CXX_FLAGS})

INSTALL(DIRECTORY etc DESTINATION .
		FILE_PERMISSIONS OWNER_WRITE OWNER_READ GROUP_READ WORLD_READ)

#INSTALL([[SCRIPT <file>] [CODE <code>]] [...])
# script 表示安装时，调用cmake 脚步
# code 表示安装时，执行cmake 命令， 例如
INSTALL(CODE "MESSAGE(\"Sample install message.\")")
# EXEC_PROGRAM make时执行命令
#EXEC_PROGRAM(Executable [directory in which to run]
#        [ARGS <arguments to executable>]
#        [OUTPUT_VARIABLE <var>]

#EXEC_PROGRAM(Executable [directory in which to run]
#        [ARGS <arguments to executable>]
#        [OUTPUT_VARIABLE <var>]
#        [RETURN_VALUE <var>])
# 生产make时，执行
#EXEC_PROGRAM(ls ARGS "*.c" OUTPUT_VARIABLE LS_OUTPUT RETURN_VALUE
#        LS_RVALUE)
#IF(not LS_RVALUE)
#    MESSAGE(STATUS "ls result: " ${LS_OUTPUT})
#ENDIF(not LS_RVALUE)