# 写到了cmake默认查找地点/usr/share/cmake-3.16/Modules
# Locate and configure the Google Protocol Buffers library
#
# Adds the following targets:
#
#  protobuf::libprotobuf - Protobuf library
#  protobuf::libprotobuf-lite - Protobuf lite library
#  protobuf::libprotoc - Protobuf Protoc Library
#  protobuf::protoc - protoc executable
#

#
# Generates C++ sources from the .proto files
#
# protobuf_generate_cpp (<SRCS> <HDRS> <DEST> [<ARGN>...])
#
#  SRCS - variable to define with autogenerated source files
#  HDRS - variable to define with autogenerated header files
#  DEST - directory where the source files will be created
#  ARGN - .proto files
#

if(NOT DEFINED PROTOBUF_ROOT)
    message(FATAL_ERROR "PROTOBUF_ROOT not set in FindgRPC.cmake")
else()

    find_path(PROTOBUF_INCLUDE_DIR google/protobuf/service.h ${PROTOBUF_ROOT}/include)
    mark_as_advanced(PROTOBUF_INCLUDE_DIR)
    message("${BoldGreen}Find_package protobuf: PROTOBUF_INCLUDE_DIR is ${PROTOBUF_INCLUDE_DIR}${ColourReset}")
    set(PROTOBUF_BINARY_DIR ${PROTOBUF_ROOT}/bin)
    set(CMAKE_LIBRARY_PATH ${CMAKE_LIBRARY_PATH} ${PROTOBUF_ROOT}/lib)
endif ()
# The Protobuf library
find_library(PROTOBUF_LIBRARY NAMES protobuf)
mark_as_advanced(PROTOBUF_LIBRARY)
add_library(protobuf::libprotobuf UNKNOWN IMPORTED)
set_target_properties(protobuf::libprotobuf PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES ${PROTOBUF_INCLUDE_DIR}
        INTERFACE_LINK_LIBRARIES pthread
        IMPORTED_LOCATION ${PROTOBUF_LIBRARY}
)

# The Protobuf lite library
find_library(PROTOBUF_LITE_LIBRARY NAMES protobuf-lite)
mark_as_advanced(PROTOBUF_LITE_LIBRARY)
add_library(protobuf::libprotobuf-lite UNKNOWN IMPORTED)
set_target_properties(protobuf::libprotobuf-lite PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES ${PROTOBUF_INCLUDE_DIR}
        INTERFACE_LINK_LIBRARIES pthread
        IMPORTED_LOCATION ${PROTOBUF_LITE_LIBRARY}
)

# The Protobuf Protoc Library
find_library(PROTOBUF_PROTOC_LIBRARY NAMES protoc)
mark_as_advanced(PROTOBUF_PROTOC_LIBRARY)
add_library(protobuf::libprotoc UNKNOWN IMPORTED)
set_target_properties(protobuf::libprotoc PROPERTIES
        INTERFACE_INCLUDE_DIRECTORIES ${PROTOBUF_INCLUDE_DIR}
        INTERFACE_LINK_LIBRARIES protobuf::libprotobuf
        IMPORTED_LOCATION ${PROTOBUF_PROTOC_LIBRARY}
)

# Find the protoc Executable
find_program(PROTOBUF_PROTOC_EXECUTABLE protoc ${PROTOBUF_BINARY_DIR})
mark_as_advanced(PROTOBUF_PROTOC_EXECUTABLE)
message("${BoldGreen}PROTOBUF_PROTOC_EXECUTABLE is ${PROTOBUF_PROTOC_EXECUTABLE}${ColourReset}")
add_executable(protobuf::protoc IMPORTED)
set_target_properties(protobuf::protoc PROPERTIES
        IMPORTED_LOCATION ${PROTOBUF_PROTOC_EXECUTABLE}
)
include(${CMAKE_ROOT}/Modules/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(Protobuf DEFAULT_MSG
        PROTOBUF_LIBRARY PROTOBUF_INCLUDE_DIR PROTOBUF_PROTOC_EXECUTABLE)