cmake_minimum_required(VERSION 3.10)
project(devGrpcClient VERSION 1.0.0 LANGUAGES CXX)

# 设置编译选项
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
add_compile_options(-fPIC -g -Wall)

# 目标目录
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
get_filename_component(DELIVER_DIR "${CMAKE_BINARY_DIR}/../../Deliver" ABSOLUTE)
file(MAKE_DIRECTORY "${DELIVER_DIR}/lib" "${DELIVER_DIR}/include")

# ========== 强制使用动态链接和共享库 ==========
# ARM Ubuntu 的系统静态库没有 -fPIC，无法链接到共享库
# 使用 CACHE FORCE 确保覆盖任何缓存中的旧值
set(GRPC_STATIC_LINK OFF CACHE BOOL "静态链接gRPC和Protobuf" FORCE)
set(BUILD_SHARED_LIBS ON CACHE BOOL "编译为共享库(.so)" FORCE)

# 强制输出消息确认配置
message(STATUS "强制配置: GRPC_STATIC_LINK=${GRPC_STATIC_LINK}, BUILD_SHARED_LIBS=${BUILD_SHARED_LIBS}")

# ========== 依赖查找：使用系统安装的 gRPC 和 Protobuf ==========
# 强制使用系统路径，避免 /usr/local 下的多版本冲突
set(CMAKE_FIND_USE_CMAKE_SYSTEM_PATH TRUE)
set(CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH FALSE)

# 1. 查找 Protobuf（优先使用系统路径）
# 设置提示路径为系统目录
set(Protobuf_ROOT "/usr")
set(CMAKE_PREFIX_PATH "/usr" ${CMAKE_PREFIX_PATH})
find_package(Protobuf REQUIRED HINTS /usr NO_CMAKE_PATH NO_CMAKE_ENVIRONMENT_PATH)
message(STATUS "找到系统Protobuf版本: ${Protobuf_VERSION}")
message(STATUS "Protobuf头文件路径: ${Protobuf_INCLUDE_DIRS}")

# 2. 查找 gRPC（通过CONFIG模式，适用于现代gRPC安装）
find_package(gRPC CONFIG QUIET)
if (gRPC_FOUND)
    message(STATUS "通过CONFIG模式找到系统gRPC版本: ${gRPC_VERSION}")
else()
    # 回退到MODULE模式（旧版或自定义安装）
    find_package(gRPC MODULE QUIET)
    if (gRPC_FOUND)
        message(STATUS "通过MODULE模式找到gRPC")
    else()
        message(STATUS "未通过find_package找到gRPC，尝试使用pkg-config")
        find_package(PkgConfig REQUIRED)
        pkg_check_modules(GRPC REQUIRED grpc++ grpc)
        set(GRPC_LIBRARIES ${GRPC_LIBRARIES})
        set(GRPC_INCLUDE_DIRS ${GRPC_INCLUDE_DIRS})
    endif()
endif()

# 3. 查找gRPC代码生成器插件（增强查找逻辑）
find_program(_GRPC_CPP_PLUGIN_EXECUTABLE grpc_cpp_plugin
    HINTS
        ${GRPC_CPP_PLUGIN_DIR}
        /usr/bin
        /usr/local/bin
        /usr/lib/grpc
        /usr/local/lib/grpc
    PATH_SUFFIXES bin
)

# 如果还是找不到，尝试从gRPC目标获取
if(NOT _GRPC_CPP_PLUGIN_EXECUTABLE AND TARGET gRPC::grpc_cpp_plugin)
    get_target_property(_GRPC_CPP_PLUGIN_EXECUTABLE gRPC::grpc_cpp_plugin LOCATION)
endif()

# 最后尝试：直接使用which命令查找
if(NOT _GRPC_CPP_PLUGIN_EXECUTABLE)
    execute_process(
        COMMAND which grpc_cpp_plugin
        OUTPUT_VARIABLE _GRPC_CPP_PLUGIN_EXECUTABLE
        OUTPUT_STRIP_TRAILING_WHITESPACE
        ERROR_QUIET
    )
endif()

if(NOT _GRPC_CPP_PLUGIN_EXECUTABLE)
    message(FATAL_ERROR
        "未找到 'grpc_cpp_plugin' 程序。\n"
        "请安装gRPC开发包：\n"
        "  Ubuntu/Debian: sudo apt install protobuf-compiler-grpc libgrpc++-dev\n"
        "  或者设置 GRPC_CPP_PLUGIN_DIR 变量指向插件所在目录"
    )
else()
    message(STATUS "找到gRPC编译器插件: ${_GRPC_CPP_PLUGIN_EXECUTABLE}")
endif()

# 4. 查找protoc编译器（优先使用与libprotobuf匹配的版本）
# 首先尝试从 Protobuf 包获取
if(TARGET protobuf::protoc)
    get_target_property(_PROTOBUF_PROTOC protobuf::protoc IMPORTED_LOCATION)
    if(NOT _PROTOBUF_PROTOC)
        get_target_property(_PROTOBUF_PROTOC protobuf::protoc LOCATION)
    endif()
endif()

# 如果没找到，使用 Protobuf_PROTOC_EXECUTABLE（由 find_package 设置）
if(NOT _PROTOBUF_PROTOC AND Protobuf_PROTOC_EXECUTABLE)
    set(_PROTOBUF_PROTOC "${Protobuf_PROTOC_EXECUTABLE}")
endif()

# 最后回退到系统路径
if(NOT _PROTOBUF_PROTOC)
    find_program(_PROTOBUF_PROTOC protoc
        HINTS
            /usr/bin
            /usr/local/bin
    )
endif()

if(NOT _PROTOBUF_PROTOC)
    message(FATAL_ERROR "未找到protoc编译器")
endif()

# 获取 protoc 版本并验证
execute_process(
    COMMAND ${_PROTOBUF_PROTOC} --version
    OUTPUT_VARIABLE PROTOC_VERSION_OUTPUT
    OUTPUT_STRIP_TRAILING_WHITESPACE
    ERROR_QUIET
)
message(STATUS "找到Protobuf编译器: ${_PROTOBUF_PROTOC}")
message(STATUS "Protoc版本: ${PROTOC_VERSION_OUTPUT}")
message(STATUS "Protobuf库版本: ${Protobuf_VERSION}")

# 警告版本不匹配
string(REGEX MATCH "[0-9]+\\.[0-9]+" PROTOC_MAJOR_MINOR "${PROTOC_VERSION_OUTPUT}")
string(REGEX MATCH "^[0-9]+\\.[0-9]+" PROTOBUF_MAJOR_MINOR "${Protobuf_VERSION}")
if(NOT "${PROTOC_MAJOR_MINOR}" STREQUAL "${PROTOBUF_MAJOR_MINOR}")
    message(WARNING
        "protoc版本(${PROTOC_MAJOR_MINOR})与protobuf库版本(${PROTOBUF_MAJOR_MINOR})不匹配！\n"
        "这可能导致编译错误。请确保 protoc 和 libprotobuf-dev 版本一致。"
    )
endif()

# ========== 包含头文件目录 ==========
# 强制优先使用系统 protobuf 头文件（/usr/include），避免 /usr/local 下的冲突版本
include_directories(BEFORE SYSTEM
    /usr/include
)

include_directories(
    ${CMAKE_CURRENT_SOURCE_DIR}/src
    ${CMAKE_CURRENT_BINARY_DIR}
)

# 只有当 Protobuf_INCLUDE_DIRS 是系统路径时才添加
if(Protobuf_INCLUDE_DIRS AND "${Protobuf_INCLUDE_DIRS}" MATCHES "^/usr/include")
    include_directories(${Protobuf_INCLUDE_DIRS})
endif()

if(DEFINED GRPC_INCLUDE_DIRS)
    # 过滤掉 /usr/local 路径，只保留系统路径
    foreach(_dir ${GRPC_INCLUDE_DIRS})
        if(NOT "${_dir}" MATCHES "^/usr/local")
            include_directories(${_dir})
        endif()
    endforeach()
endif()

# ========== 编译Proto文件 ==========
get_filename_component(DEV_PROTO "${CMAKE_CURRENT_SOURCE_DIR}/protos/device-sm.proto" ABSOLUTE)
get_filename_component(DEV_PROTO_DIR "${DEV_PROTO}" PATH)

set(DEV_PROTO_SRC "${CMAKE_CURRENT_BINARY_DIR}/device-sm.pb.cc")
set(DEV_PROTO_HDR "${CMAKE_CURRENT_BINARY_DIR}/device-sm.pb.h")
set(DEV_GRPC_SRC "${CMAKE_CURRENT_BINARY_DIR}/device-sm.grpc.pb.cc")
set(DEV_GRPC_HDR "${CMAKE_CURRENT_BINARY_DIR}/device-sm.grpc.pb.h")

# 清理旧的proto生成文件（防止跨版本不兼容）
# 检查是否存在旧文件，如果protobuf版本变化则删除重新生成
set(PROTO_VERSION_FILE "${CMAKE_CURRENT_BINARY_DIR}/.protobuf_version")
if(EXISTS "${PROTO_VERSION_FILE}")
    file(READ "${PROTO_VERSION_FILE}" CACHED_PROTOBUF_VERSION)
    string(STRIP "${CACHED_PROTOBUF_VERSION}" CACHED_PROTOBUF_VERSION)
    if(NOT "${CACHED_PROTOBUF_VERSION}" STREQUAL "${Protobuf_VERSION}")
        message(STATUS "Protobuf版本变化 (${CACHED_PROTOBUF_VERSION} -> ${Protobuf_VERSION})，清理旧的proto文件")
        file(REMOVE "${DEV_PROTO_SRC}" "${DEV_PROTO_HDR}" "${DEV_GRPC_SRC}" "${DEV_GRPC_HDR}")
    endif()
endif()
file(WRITE "${PROTO_VERSION_FILE}" "${Protobuf_VERSION}")

# 使用找到的protoc路径（兼容不同版本）
add_custom_command(
    OUTPUT "${DEV_PROTO_SRC}" "${DEV_PROTO_HDR}" "${DEV_GRPC_SRC}" "${DEV_GRPC_HDR}"
    COMMAND ${_PROTOBUF_PROTOC}
    ARGS
        --grpc_out="${CMAKE_CURRENT_BINARY_DIR}"
        --cpp_out="${CMAKE_CURRENT_BINARY_DIR}"
        -I "${DEV_PROTO_DIR}"
        --plugin=protoc-gen-grpc="${_GRPC_CPP_PLUGIN_EXECUTABLE}"
        "${DEV_PROTO}"
    DEPENDS "${DEV_PROTO}"
    COMMENT "生成gRPC proto代码 (protobuf ${Protobuf_VERSION})"
)

add_custom_target(GenerateProto ALL
    DEPENDS "${DEV_PROTO_SRC}" "${DEV_PROTO_HDR}" "${DEV_GRPC_SRC}" "${DEV_GRPC_HDR}"
)

# ========== 编译动态库 ==========
set(SRC_FILES
    ${CMAKE_CURRENT_SOURCE_DIR}/src/devGrpcClient.cpp
    ${DEV_PROTO_SRC}
    ${DEV_GRPC_SRC}
)

# 根据选项编译为共享库或静态库
if(BUILD_SHARED_LIBS)
    add_library(devGrpcClient SHARED ${SRC_FILES})
else()
    add_library(devGrpcClient STATIC ${SRC_FILES})
endif()
add_dependencies(devGrpcClient GenerateProto)

set_target_properties(devGrpcClient PROPERTIES
    VERSION ${PROJECT_VERSION}
    SOVERSION 1
    OUTPUT_NAME "devGrpcClient"
)

# ========== 链接依赖库 ==========
if(GRPC_STATIC_LINK)
    message(STATUS "使用静态链接模式（提高跨系统兼容性）")

    # 查找静态库
    find_library(GRPC_STATIC_LIB libgrpc.a grpc PATHS /usr/lib /usr/local/lib /usr/lib/aarch64-linux-gnu /usr/lib/x86_64-linux-gnu)
    find_library(GRPCPP_STATIC_LIB libgrpc++.a grpc++ PATHS /usr/lib /usr/local/lib /usr/lib/aarch64-linux-gnu /usr/lib/x86_64-linux-gnu)
    find_library(GPR_STATIC_LIB libgpr.a gpr PATHS /usr/lib /usr/local/lib /usr/lib/aarch64-linux-gnu /usr/lib/x86_64-linux-gnu)
    find_library(ADDRESS_SORTING_LIB libaddress_sorting.a address_sorting PATHS /usr/lib /usr/local/lib /usr/lib/aarch64-linux-gnu /usr/lib/x86_64-linux-gnu)
    find_library(PROTOBUF_STATIC_LIB libprotobuf.a protobuf PATHS /usr/lib /usr/local/lib /usr/lib/aarch64-linux-gnu /usr/lib/x86_64-linux-gnu)
    find_library(CARES_LIB cares PATHS /usr/lib /usr/local/lib /usr/lib/aarch64-linux-gnu /usr/lib/x86_64-linux-gnu)
    find_library(RE2_LIB re2 PATHS /usr/lib /usr/local/lib /usr/lib/aarch64-linux-gnu /usr/lib/x86_64-linux-gnu)
    find_library(UPBDEFS_LIB upb_json_lib upb PATHS /usr/lib /usr/local/lib /usr/lib/aarch64-linux-gnu /usr/lib/x86_64-linux-gnu)

    # 检查是否找到静态库
    if(GRPCPP_STATIC_LIB AND GRPC_STATIC_LIB AND PROTOBUF_STATIC_LIB)
        message(STATUS "找到gRPC静态库: ${GRPCPP_STATIC_LIB}")
        message(STATUS "找到Protobuf静态库: ${PROTOBUF_STATIC_LIB}")

        # 构建静态链接列表
        set(GRPC_LINK_LIBS
            ${GRPCPP_STATIC_LIB}
            ${GRPC_STATIC_LIB}
            ${GPR_STATIC_LIB}
            ${PROTOBUF_STATIC_LIB}
        )

        # 添加可选依赖
        if(ADDRESS_SORTING_LIB)
            list(APPEND GRPC_LINK_LIBS ${ADDRESS_SORTING_LIB})
        endif()
        if(CARES_LIB)
            list(APPEND GRPC_LINK_LIBS ${CARES_LIB})
        endif()
        if(RE2_LIB)
            list(APPEND GRPC_LINK_LIBS ${RE2_LIB})
        endif()
        if(UPBDEFS_LIB)
            list(APPEND GRPC_LINK_LIBS ${UPBDEFS_LIB})
        endif()

        target_link_libraries(devGrpcClient PRIVATE
            -Wl,--start-group
            ${GRPC_LINK_LIBS}
            -Wl,--end-group
            pthread dl z ssl crypto
        )
    else()
        message(WARNING "未找到gRPC静态库，回退到动态链接模式")
        set(GRPC_STATIC_LINK OFF)
    endif()
endif()

if(NOT GRPC_STATIC_LINK)
    message(STATUS "使用动态链接模式")

    # 优先使用CMake目标
    if(TARGET gRPC::grpc++)
        target_link_libraries(devGrpcClient PRIVATE
            gRPC::grpc++
            protobuf::libprotobuf
            pthread dl z ssl crypto
        )
    elseif(DEFINED GRPC_LIBRARIES)
        # 使用pkg-config找到的库
        target_link_libraries(devGrpcClient PRIVATE
            ${GRPC_LIBRARIES}
            ${Protobuf_LIBRARIES}
            pthread dl z ssl crypto
        )
    else()
        # 最后回退：直接链接库名
        target_link_libraries(devGrpcClient PRIVATE
            grpc++ grpc gpr
            protobuf
            pthread dl z ssl crypto
        )
    endif()
endif()

# ========== 输出到交付目录 ==========
if(BUILD_SHARED_LIBS)
    add_custom_command(TARGET devGrpcClient POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy_if_different "$<TARGET_FILE:devGrpcClient>" "${DELIVER_DIR}/lib/"
        COMMAND ${CMAKE_COMMAND} -E create_symlink "$<TARGET_FILE_NAME:devGrpcClient>" "${DELIVER_DIR}/lib/$<TARGET_SONAME_FILE_NAME:devGrpcClient>"
        COMMAND ${CMAKE_COMMAND} -E create_symlink "$<TARGET_SONAME_FILE_NAME:devGrpcClient>" "${DELIVER_DIR}/lib/$<TARGET_LINKER_FILE_NAME:devGrpcClient>"
        COMMAND ${CMAKE_COMMAND} -E copy_if_different "${CMAKE_CURRENT_SOURCE_DIR}/src/devGrpcClient.h" "${DELIVER_DIR}/include/"
    )
else()
    # 静态库只需要复制 .a 文件
    add_custom_command(TARGET devGrpcClient POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy_if_different "$<TARGET_FILE:devGrpcClient>" "${DELIVER_DIR}/lib/"
        COMMAND ${CMAKE_COMMAND} -E copy_if_different "${CMAKE_CURRENT_SOURCE_DIR}/src/devGrpcClient.h" "${DELIVER_DIR}/include/"
    )
endif()

# ========== 打印配置摘要 ==========
message(STATUS "========== devGrpcClient 配置摘要 ==========")
message(STATUS "Protobuf版本: ${Protobuf_VERSION}")
message(STATUS "gRPC版本: ${gRPC_VERSION}")
message(STATUS "静态链接gRPC: ${GRPC_STATIC_LINK}")
message(STATUS "编译为共享库: ${BUILD_SHARED_LIBS}")
message(STATUS "交付目录: ${DELIVER_DIR}")
message(STATUS "============================================")