cmake_minimum_required(VERSION 3.12)
project(Crc64 VERSION 1.0.0 LANGUAGES CXX)

# 设置 C++ 标准
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# 添加编译选项: -g 生成调试信息, -fPIC 位置无关代码
add_compile_options(-g -fPIC)

# 添加地址 sanitizer 选项（用于检测内存错误）
# 仅在 Debug 模式下启用，避免影响 Release 性能
set(SANITIZE_OPTIONS -fsanitize=address)
add_compile_options($<$<CONFIG:Debug>:${SANITIZE_OPTIONS}>)
link_libraries($<$<CONFIG:Debug>:${SANITIZE_OPTIONS}>)

# 配置输出目录
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)

# 添加项目包含目录
# include_directories(
#     ${CMAKE_SOURCE_DIR}/include
#     ${CMAKE_SOURCE_DIR}/src
# )

# 设置交付目录
get_filename_component(DELIVER_DIR "${CMAKE_BINARY_DIR}/../../Deliver" ABSOLUTE)
message(STATUS "交付目录: ${DELIVER_DIR}")

# 配置源文件
set(SRC_FILES
    crc16_modbus.cpp
    Crc64.cpp
    md5c.cpp
)

# 创建库目标
add_library(Crc64 SHARED ${SRC_FILES})

# 设置目标属性
set_target_properties(Crc64 PROPERTIES
    VERSION ${PROJECT_VERSION}
    SOVERSION 1
    OUTPUT_NAME "Crc64"
)

# 链接依赖库
if(UNIX AND NOT APPLE)
    # Linux 特定库
    target_link_libraries(Crc64 PRIVATE pthread)
endif()

# 确保交付目录存在
file(MAKE_DIRECTORY 
    "${DELIVER_DIR}/lib"
    "${DELIVER_DIR}/bin"
    "${DELIVER_DIR}/include"
)

add_custom_command(TARGET Crc64 POST_BUILD
    COMMENT "===== 复制构建产物到交付目录 ====="
    
    # 1. 准备交付目录（确保目录存在，避免操作失败）
    COMMAND ${CMAKE_COMMAND} -E echo "准备交付目录（lib/bin/include）..."
    COMMAND ${CMAKE_COMMAND} -E make_directory "${DELIVER_DIR}/lib"
    COMMAND ${CMAKE_COMMAND} -E make_directory "${DELIVER_DIR}/bin"
    COMMAND ${CMAKE_COMMAND} -E make_directory "${DELIVER_DIR}/include"
    
    # 2. 复制核心库文件（唯一真实二进制文件，如 libCrc64.so.1.0.0）
    COMMAND ${CMAKE_COMMAND} -E echo "复制核心库文件（Crc64完整版本）..."
    COMMAND ${CMAKE_COMMAND} -E copy_if_different
        "$<TARGET_FILE:Crc64>"          # 源：完整版本核心库（含全版本号）
        "${DELIVER_DIR}/lib"            # 目标：交付目录的lib文件夹
    
    # 3. 创建主版本符号链接（如 libCrc64.so.1 -> libCrc64.so.1.0.0）
    # 作用：保障主版本兼容性（升级同主版本号的库时，依赖程序无需重新编译）
    COMMAND ${CMAKE_COMMAND} -E echo "创建主版本符号链接（.so.1 -> 完整版本）..."
    COMMAND ${CMAKE_COMMAND} -E create_symlink
        "$<TARGET_FILE_NAME:Crc64>"     # 链接指向的目标（核心库文件名）
        "${DELIVER_DIR}/lib/$<TARGET_SONAME_FILE_NAME:Crc64>"  # 链接文件本身（主版本名）
    
    # 4. 创建通用符号链接（如 libCrc64.so -> libCrc64.so.1）
    # 作用：简化编译链接，其他项目可通过 -lCrc64 直接引用
    COMMAND ${CMAKE_COMMAND} -E echo "创建通用符号链接（.so -> 主版本）..."
    COMMAND ${CMAKE_COMMAND} -E create_symlink
        "$<TARGET_SONAME_FILE_NAME:Crc64>"  # 链接指向的目标（主版本链接名）
        "${DELIVER_DIR}/lib/$<TARGET_LINKER_FILE_NAME:Crc64>"  # 链接文件本身（通用名）
    
    # 复制头文件
    COMMAND ${CMAKE_COMMAND} -E echo "复制头文件..."
    COMMAND ${CMAKE_COMMAND} -E make_directory "${DELIVER_DIR}/include"
)

# 单独处理头文件复制（支持多配置生成器）
set(HEADER_TO_COPY)
if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/Crc64.h")
    set(HEADER_TO_COPY "${CMAKE_CURRENT_SOURCE_DIR}/Crc64.h")
elseif(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/Crc64.hpp")
    set(HEADER_TO_COPY "${CMAKE_CURRENT_SOURCE_DIR}/Crc64.hpp")
endif()

if(HEADER_TO_COPY)
    add_custom_command(TARGET Crc64 POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy_if_different
            "${HEADER_TO_COPY}"
            "${DELIVER_DIR}/include"
        COMMENT "复制头文件: ${HEADER_TO_COPY}"
    )
else()
    message(WARNING "未找到与目标 Crc64 同名的头文件")
endif()