cmake_minimum_required(VERSION 3.10)
include(ExternalProject)
include(FetchContent)

set(DISABLE_FoX OFF CACHE BOOL "Disable FoX library to process XML files.")
message("DISABLE_FoX = ${DISABLE_FoX}")
if(DISABLE_FoX)
  add_definitions(-DDISABLE_FoX)
endif()

if (DEFINED CIMEROOT)
  message("Using CIME in ${CIMEROOT} with compiler ${COMPILER}")
  include(${CASEROOT}/Macros.cmake)
  if (${PIO_VERSION} LESS 2)
    message( FATAL_ERROR "Version 2 of the PIO library required")
  endif()
  if (MPILIB STREQUAL mpi-serial)
    set(CMAKE_Fortran_COMPILER ${SFC})
    set(CMAKE_C_COMPILER ${SCC})
  else()
    set(CMAKE_Fortran_COMPILER ${MPIFC})
    set(CMAKE_C_COMPILER ${MPICC})
  endif()
  set(CMAKE_Fortran_FLAGS "${FFLAGS} ${CPPDEFS} -I${LIBROOT}/include -I${LIBROOT}/nuopc/esmf/${NINST_VALUE}/include")
  add_compile_definitions(CESMCOUPLED)
  list(APPEND CMAKE_MODULE_PATH ${SRC_ROOT}/components/cdeps/cmake)
  set(FOX_ROOT ${SRC_ROOT}/components/cdeps/fox)
else()
  set(BLD_STANDALONE TRUE)
  project(NUOPC_DATA_MODELS LANGUAGES Fortran VERSION 0.1)
  list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake)
  if(NOT DISABLE_FoX)
    set(FOX_ROOT ${CMAKE_SOURCE_DIR}/fox)
  endif()
endif()
message("CMAKE_MODULE_PATH is ${CMAKE_MODULE_PATH}, CMAKE_Fortran_COMPILER is ${CMAKE_Fortran_COMPILER}")
enable_language(Fortran)

if (TARGET esmf)
  message("Target esmf is already found. Skip find_package ...")
else()
  find_package(ESMF REQUIRED)
endif()

option(WERROR "add the -Werror flag to compiler (works with gcc and intel)" OFF)


if (DEFINED ENV{PIO_ROOT})
  message("PIO_ROOT is $ENV{PIO_ROOT}")
else()
  if (DEFINED PIO)
    set(PIO_PATH ${PIO})
  else()
    set(PIO_PATH $ENV{PIO})
  endif()
  find_package(PIO REQUIRED COMPONENT C Fortran PATH ${PIO_PATH})
endif()

if (NOT DEFINED MPILIB OR NOT ${MPILIB} STREQUAL "mpi-serial")
  find_package(MPI REQUIRED)
endif()

if(BLD_STANDALONE)
  add_subdirectory(share)
  list(APPEND EXTRA_LIBS cdeps_share)
endif()
if("${COMPILER}" STREQUAL "nag")
  set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -D__NAG__")
endif()
add_subdirectory(streams)
add_subdirectory(dshr)

if(NOT DISABLE_FoX)
  if(IS_DIRECTORY "${FOX_ROOT}")
    message(STATUS "FoX library is already checked out!")
    message(STATUS "FoX source dir: ${FOX_ROOT}")
  else()
    FetchContent_Declare(fox
      GIT_REPOSITORY https://github.com/ESMCI/fox.git
      GIT_TAG 4.1.2.1
      SOURCE_DIR ${FOX_ROOT}
      BINARY_DIR ${FOX_ROOT}/..
    )
    FetchContent_GetProperties(fox)
    if(NOT fox_POPULATED)
      FetchContent_Populate(fox)
      message(STATUS "FoX source dir: ${fox_SOURCE_DIR}")
      message(STATUS "FoX binary dir: ${fox_BINARY_DIR}")
    endif()
  endif()
  add_subdirectory(fox)

  target_include_directories(streams PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/fox/include>
                                            $<INSTALL_INTERFACE:mod>)
  target_include_directories(dshr PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/fox/include>
                                         $<INSTALL_INTERFACE:mod>)
endif()

target_include_directories(dshr PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/streams>
                                       $<INSTALL_INTERFACE:mod>)

foreach(COMP datm dice dlnd docn drof dwav)
  add_subdirectory("${COMP}")
  if(BLD_STANDALONE)
    target_include_directories(${COMP} PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/share>
                                            $<INSTALL_INTERFACE:mod>)
  endif()
  target_include_directories(${COMP} PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/streams>
                                            $<INSTALL_INTERFACE:mod>)
  target_include_directories(${COMP} PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/dshr>
                                            $<INSTALL_INTERFACE:mod>)

  if(WERROR)
     target_compile_options(${COMP} PRIVATE -Werror --warn-no-unused-dummy-argument --warn-no-missing-include-dirs)
  endif()
  install(TARGETS ${COMP}
          EXPORT  ${COMP}
          ARCHIVE DESTINATION lib
          LIBRARY DESTINATION lib
          COMPONENT Library)
  install(EXPORT      ${COMP}
          DESTINATION lib/cmake)
endforeach(COMP)

foreach(DEPS streams dshr cdeps_share FoX_dom FoX_wxml FoX_sax FoX_common FoX_utils FoX_fsys)
  if(DISABLE_FoX AND ${DEPS} MATCHES "^FoX")
     continue()
  endif()
  if(NOT BLD_STANDALONE AND ${DEPS} STREQUAL "cdeps_share")
     continue()
  endif()
  string(SUBSTRING ${DEPS} 0 3 fox)
  if(WERROR AND NOT ${fox} STREQUAL "FoX")
     message("Adding Werror flag to ${DEPS} (fox = ${fox})")
     target_compile_options(${DEPS} PRIVATE -Werror --warn-no-unused-dummy-argument --warn-no-missing-include-dirs)
  endif()

  install(TARGETS ${DEPS}
          EXPORT  ${DEPS}
          ARCHIVE DESTINATION lib
          LIBRARY DESTINATION lib
          COMPONENT Library)
  install(EXPORT      ${DEPS}
          DESTINATION lib/cmake)
endforeach(DEPS)