if(RDK_BUILD_FREESASA_SUPPORT)

if(NOT DEFINED FREESASA_DIR)
  set(FREESASA_DIR "${CMAKE_CURRENT_SOURCE_DIR}/freesasa")
  set(needDownload "TRUE")
  if(EXISTS "${FREESASA_DIR}/src/freesasa.h")
    set(needDownload "FALSE")
  endif()
endif()

if(needDownload)
  # don't actually use the md5 here
  if(MSVC)
    message(FATAL_ERROR "FreeSASA currently not working on windows.  Come back soon!")
    set(FREESASA_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}/freesasa-windows")

    if(NOT EXISTS "${FREESASA_SRC_DIR}/src")
      message("Downloading WINDOWS FREESASA source")
      downloadAndCheckMD5("https://github.com/mittinatten/freesasa/archive/windows.tar.gz"
            "${CMAKE_CURRENT_SOURCE_DIR}/master.tar.gz"
            "")
      execute_process(COMMAND ${CMAKE_COMMAND} -E tar zxf
        ${CMAKE_CURRENT_SOURCE_DIR}/master.tar.gz
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})

      message("Copying freesasa2.c to ${FREESASA_SRC_DIR}/src/freesasa2.c")
      file(COPY freesasa2.c DESTINATION ${FREESASA_SRC_DIR}/src/)
    else()
      message("FreeSASA found in ${FREESASA_SRC_DIR}, no download required")
    endif()


      set(FREESASA_GETLINE "getline.c")
  else()
    set(FREESASA_VERSION "2.0.1")
    set(FREESASA_SRC_DIR "${CMAKE_CURRENT_SOURCE_DIR}/freesasa-${FREESASA_VERSION}")
    if(NOT EXISTS "${FREESASA_SRC_DIR}/src")
      downloadAndCheckMD5("https://github.com/mittinatten/freesasa/releases/download/${FREESASA_VERSION}/freesasa-${FREESASA_VERSION}.tar.gz"
            "${CMAKE_CURRENT_SOURCE_DIR}/master.tar.gz"
            "")
      execute_process(COMMAND ${CMAKE_COMMAND} -E tar zxf
        ${CMAKE_CURRENT_SOURCE_DIR}/master.tar.gz
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
      message("Copying freesasa2.c to ${FREESASA_SRC_DIR}/src/freesasa2.c")
      file(COPY freesasa2.c DESTINATION ${FREESASA_SRC_DIR}/src/)
    else()
      message("FreeSASA found in ${FREESASA_SRC_DIR}, no download required")
    endif()
    set(FREESASA_GETLINE "")
  endif()
endif()

macro(use_c99)
  if (CMAKE_VERSION VERSION_LESS "3.1")
    if (CMAKE_C_COMPILER_ID STREQUAL "GNU")
      set (CMAKE_C_FLAGS "--std=gnu99 ${CMAKE_C_FLAGS}")
    endif ()
  else ()
    set (CMAKE_C_STANDARD 99)
  endif ()
endmacro(use_c99)

use_c99()

set (freesasa_clib_srcs
    ${FREESASA_SRC_DIR}/src/classifier.c
    ${FREESASA_SRC_DIR}/src/classifier_naccess.c
    ${FREESASA_SRC_DIR}/src/classifier_oons.c
    ${FREESASA_SRC_DIR}/src/classifier_protor.c
    ${FREESASA_SRC_DIR}/src/coord.c
    ${FREESASA_SRC_DIR}/src/freesasa2.c
    ${FREESASA_SRC_DIR}/src/lexer.c
    ${FREESASA_SRC_DIR}/src/log.c
    ${FREESASA_SRC_DIR}/src/nb.c
    ${FREESASA_SRC_DIR}/src/node.c
    ${FREESASA_SRC_DIR}/src/parser.c
    ${FREESASA_SRC_DIR}/src/pdb.c
    ${FREESASA_SRC_DIR}/src/rsa.c
    ${FREESASA_SRC_DIR}/src/sasa_lr.c
    ${FREESASA_SRC_DIR}/src/sasa_sr.c
    ${FREESASA_SRC_DIR}/src/selection.c
    ${FREESASA_SRC_DIR}/src/structure.c
    ${FREESASA_SRC_DIR}/src/util.c
    ${FREESASA_GETLINE}
    )

add_definitions(-DUSE_THREADS=0)
add_definitions(-DUSE_JSON=0)
add_definitions(-DUSE_XML=0)
rdkit_library(freesasa_clib ${freesasa_clib_srcs})
include_directories("${FREESASA_SRC_DIR}/src")

rdkit_library(FreeSASALib RDFreeSASA.cpp SHARED LINK_LIBRARIES freesasa_clib GraphMol DataStructs RDGeometryLib RDGeneral )
rdkit_headers(RDFreeSASA.h DEST GraphMol)

rdkit_test(testFreeSASALib testFreeSASA.cpp
           LINK_LIBRARIES FreeSASALib freesasa_clib FileParsers SmilesParse
                          GraphMol DataStructs RDGeometryLib RDGeneral)

add_subdirectory(Wrap)

endif(RDK_BUILD_FREESASA_SUPPORT)