# Proto compilation for smartbotic-database

# Get the protobuf compiler and gRPC plugin
find_program(PROTOC protoc REQUIRED)
find_program(GRPC_CPP_PLUGIN grpc_cpp_plugin REQUIRED)

# Get the include directory for well-known types
get_target_property(PROTOBUF_INCLUDE_DIR protobuf::libprotobuf INTERFACE_INCLUDE_DIRECTORIES)
if(NOT PROTOBUF_INCLUDE_DIR)
    # Fallback for system protobuf
    set(PROTOBUF_INCLUDE_DIR "/usr/include")
endif()

# Create output directory
set(PROTO_OUTPUT_DIR "${CMAKE_CURRENT_BINARY_DIR}/generated")
file(MAKE_DIRECTORY ${PROTO_OUTPUT_DIR})

# Proto file
set(PROTO_FILE "${CMAKE_CURRENT_SOURCE_DIR}/database.proto")

# Generated files
set(PROTO_SRCS "${PROTO_OUTPUT_DIR}/database.pb.cc")
set(PROTO_HDRS "${PROTO_OUTPUT_DIR}/database.pb.h")
set(GRPC_SRCS "${PROTO_OUTPUT_DIR}/database.grpc.pb.cc")
set(GRPC_HDRS "${PROTO_OUTPUT_DIR}/database.grpc.pb.h")

# Generate proto and gRPC files
add_custom_command(
    OUTPUT ${PROTO_SRCS} ${PROTO_HDRS} ${GRPC_SRCS} ${GRPC_HDRS}
    COMMAND ${PROTOC}
        --proto_path=${CMAKE_CURRENT_SOURCE_DIR}
        --proto_path=${PROTOBUF_INCLUDE_DIR}
        --cpp_out=${PROTO_OUTPUT_DIR}
        --grpc_out=${PROTO_OUTPUT_DIR}
        --plugin=protoc-gen-grpc=${GRPC_CPP_PLUGIN}
        ${PROTO_FILE}
    DEPENDS ${PROTO_FILE}
    COMMENT "Generating protobuf/gRPC code for database.proto"
    VERBATIM
)

# Create proto library
if(BUILD_SHARED_LIBS)
    add_library(smartbotic_db_proto OBJECT ${PROTO_SRCS} ${GRPC_SRCS})
    set_target_properties(smartbotic_db_proto PROPERTIES POSITION_INDEPENDENT_CODE ON)
else()
    add_library(smartbotic_db_proto STATIC ${PROTO_SRCS} ${GRPC_SRCS})
endif()

target_include_directories(smartbotic_db_proto PUBLIC
    $<BUILD_INTERFACE:${PROTO_OUTPUT_DIR}>
    $<INSTALL_INTERFACE:include>
)

# Suppress warnings in generated code
target_compile_options(smartbotic_db_proto PRIVATE
    -Wno-unused-parameter
    -Wno-array-bounds
)

# Link dependencies
if(TARGET gRPC::grpc++)
    target_link_libraries(smartbotic_db_proto PUBLIC
        protobuf::libprotobuf
        gRPC::grpc++
        absl::log_internal_check_op
    )
else()
    target_link_libraries(smartbotic_db_proto PUBLIC
        protobuf
        ${GRPC_LIBRARIES}
    )
    target_include_directories(smartbotic_db_proto PUBLIC ${GRPC_INCLUDE_DIRS})
endif()

# Export for other targets
add_library(smartbotic::db_proto ALIAS smartbotic_db_proto)