# ======================================
# BuildDeps.cmake
#
# Configure, build, and install open62541 and QtOpcUa from git submodules under
# deps/.
#
# Skip detection: if the built .so already exists, the corresponding dep is
# skipped. Delete the file to rebuild.
# ======================================

set(OPEN62541_SOURCE_DIR "${CMAKE_SOURCE_DIR}/deps/open62541")
set(OPEN62541_BUILD_DIR "${CMAKE_BINARY_DIR}/deps/open62541-build")
set(OPEN62541_INSTALL_DIR "${CMAKE_BINARY_DIR}/deps/open62541-install")
set(QTOPCUA_SOURCE_DIR "${CMAKE_SOURCE_DIR}/deps/qtopcua")
set(QTOPCUA_BUILD_DIR "${CMAKE_BINARY_DIR}/deps/qtopcua-build")
set(QTOPCUA_INSTALL_DIR "${CMAKE_BINARY_DIR}/deps/qtopcua-install")

# Verify submodules are initialized
if(NOT EXISTS "${OPEN62541_SOURCE_DIR}/CMakeLists.txt")
  message(
    FATAL_ERROR
      "open62541 submodule not initialized. Run: git submodule update --init --recursive"
  )
endif()
if(NOT EXISTS "${QTOPCUA_SOURCE_DIR}/CMakeLists.txt")
  message(
    FATAL_ERROR
      "qtopcua submodule not initialized. Run: git submodule update --init --recursive"
  )
endif()

# ======================================
# open62541
# ======================================
if(NOT EXISTS "${OPEN62541_INSTALL_DIR}/lib/libopen62541.so")

  message(STATUS "Configuring open62541 in ${OPEN62541_BUILD_DIR}...")
  set(_cmd
      ${CMAKE_COMMAND}
      -S
      "${OPEN62541_SOURCE_DIR}"
      -B
      "${OPEN62541_BUILD_DIR}"
      -G
      Ninja
      -DCMAKE_INSTALL_PREFIX=${OPEN62541_INSTALL_DIR}
      -DBUILD_SHARED_LIBS=ON
      -DUA_ENABLE_ENCRYPTION=OPENSSL
      -DUA_ENABLE_DISCOVERY=ON)
  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
  if(_result)
    list(JOIN _cmd " " _cmd_str)
    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
  endif()

  message(STATUS "Building open62541 in ${OPEN62541_BUILD_DIR}...")
  set(_cmd ${CMAKE_COMMAND} --build "${OPEN62541_BUILD_DIR}" --parallel)
  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
  if(_result)
    list(JOIN _cmd " " _cmd_str)
    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
  endif()

  message(STATUS "Installing open62541 to ${OPEN62541_INSTALL_DIR}...")
  set(_cmd ${CMAKE_COMMAND} --install "${OPEN62541_BUILD_DIR}")
  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
  if(_result)
    list(JOIN _cmd " " _cmd_str)
    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
  endif()

else()
  message(STATUS "open62541 already built, skipping")
endif()

# ======================================
# QtOpcUa
# ======================================

find_program(QT_CMAKE_COMMAND bin/qt-cmake REQUIRED)

if(NOT EXISTS "${QTOPCUA_INSTALL_DIR}/lib/libQt6OpcUa.so")

  message(STATUS "Configuring qtopcua in ${QTOPCUA_BUILD_DIR}...")
  set(_cmd
      ${QT_CMAKE_COMMAND}
      -S
      "${QTOPCUA_SOURCE_DIR}"
      -B
      "${QTOPCUA_BUILD_DIR}"
      -G
      Ninja
      -DCMAKE_INSTALL_PREFIX=${QTOPCUA_INSTALL_DIR}
      # Use our locally-built open62541, not the bundled copy
      -DINPUT_open62541=system
      -DCMAKE_PREFIX_PATH=${OPEN62541_INSTALL_DIR})
  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
  if(_result)
    list(JOIN _cmd " " _cmd_str)
    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
  endif()

  message(STATUS "Building qtopcua in ${QTOPCUA_BUILD_DIR}...")
  set(_cmd ${CMAKE_COMMAND} --build "${QTOPCUA_BUILD_DIR}" --parallel)
  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
  if(_result)
    list(JOIN _cmd " " _cmd_str)
    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
  endif()

  message(STATUS "Installing qtopcua to ${QTOPCUA_INSTALL_DIR}...")
  set(_cmd ${CMAKE_COMMAND} --install "${QTOPCUA_BUILD_DIR}")
  execute_process(COMMAND ${_cmd} RESULT_VARIABLE _result)
  if(_result)
    list(JOIN _cmd " " _cmd_str)
    message(FATAL_ERROR "${_cmd_str} failed: ${_result}")
  endif()

else()
  message(STATUS "qtopcua already built, skipping")
endif()

# The QtOpcUa backend plugin uses $ORIGIN-relative RUNPATH that resolves to
# qtopcua-install/lib/. Symlink the open62541 libs there so dlopen finds them.
file(GLOB _open62541_libs "${OPEN62541_INSTALL_DIR}/lib/libopen62541*")
foreach(_lib ${_open62541_libs})
  get_filename_component(_name ${_lib} NAME)
  if(NOT EXISTS "${QTOPCUA_INSTALL_DIR}/lib/${_name}")
    file(CREATE_LINK ${_lib} "${QTOPCUA_INSTALL_DIR}/lib/${_name}" SYMBOLIC)
  endif()
endforeach()