###############################################################################
# Copyright (c) 2017, Lawrence Livermore National Security, LLC.
#
# Produced at the Lawrence Livermore National Laboratory
#
# LLNL-CODE-725085
#
# All rights reserved.
#
# This file is part of BLT.
#
# For additional details, please also read BLT/LICENSE.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
#   this list of conditions and the disclaimer below.
#
# * Redistributions in binary form must reproduce the above copyright notice,
#   this list of conditions and the disclaimer (as noted below) in the
#   documentation and/or other materials provided with the distribution.
#
# * Neither the name of the LLNS/LLNL nor the names of its contributors may
#   be used to endorse or promote products derived from this software without
#   specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL LAWRENCE LIVERMORE NATIONAL SECURITY,
# LLC, THE U.S. DEPARTMENT OF ENERGY OR CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
###############################################################################

if (NOT BLT_LOADED)
    set (BLT_LOADED True)
    mark_as_advanced(BLT_LOADED)

    set( BLT_ROOT_DIR ${CMAKE_CURRENT_LIST_DIR} CACHE PATH "" FORCE )

    # if an explicit build dir was not specified, set a default.
    if( NOT BLT_BUILD_DIR )
        set( BLT_BUILD_DIR ${PROJECT_BINARY_DIR}/blt CACHE PATH "" FORCE )
    endif()

    ################################
    # Prevent in-source builds
    ################################
    # Fail if someone tries to config an in-source build.
    if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
        message(FATAL_ERROR "In-source builds are not supported. Please remove "
                            "CMakeCache.txt from the 'src' dir and configure an "
                            "out-of-source build in another directory.")
    endif()

    ################################
    # Setup build options and their default values
    ################################
    include(${BLT_ROOT_DIR}/cmake/BLTOptions.cmake)

    ################################
    # Invoke CMake Fortran setup
    # if ENABLE_FORTRAN == ON
    ################################
    if(ENABLE_FORTRAN)
        enable_language(Fortran)
    endif()

    ################################
    # Enable ctest support
    ################################
    if(ENABLE_TESTS)
        enable_testing()
    endif()

    ################################
    # Enable cmake generator folder feature
    # if ENABLE_FOLDERS == ON
    ################################
    if(ENABLE_FOLDERS)
        set_property(GLOBAL PROPERTY USE_FOLDERS ON)
    endif()

    ################################
    # Macros
    ################################
    include(${BLT_ROOT_DIR}/cmake/BLTMacros.cmake)

    ################################
    # Standard TPL support
    ################################
    include(${BLT_ROOT_DIR}/cmake/thirdparty/SetupThirdParty.cmake)

    ################################
    # Git related Macros
    ################################
    if (Git_FOUND)
        include(${BLT_ROOT_DIR}/cmake/BLTGitMacros.cmake)
    endif()

    ################################
    # Setup docs targets
    ################################
    include(${BLT_ROOT_DIR}/cmake/SetupDocs.cmake)

    ################################
    # Setup source checks
    ################################
    include(${BLT_ROOT_DIR}/cmake/SetupCodeChecks.cmake)

    ################################
    # Standard Build Layout
    ################################

    # Defines the layout of the build directory. Namely,
    # it indicates the location where the various header files should go,
    # where to store libraries (static or shared), the location of the
    # bin directory for all executables and the location for fortran modules.

    # Set the path where all the headers will be stored
    if ( ENABLE_COPY_HEADERS )
        set(HEADER_INCLUDES_DIRECTORY
            ${PROJECT_BINARY_DIR}/include/
            CACHE PATH
            "Directory where all headers will go in the build tree")
        include_directories(${HEADER_INCLUDES_DIRECTORY})
    endif()

    # Set the path where all the libraries will be stored
    set(LIBRARY_OUTPUT_PATH
        ${PROJECT_BINARY_DIR}/lib
        CACHE PATH
        "Directory where compiled libraries will go in the build tree")

    # Set the path where all the installed executables will go
    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY
        ${PROJECT_BINARY_DIR}/bin
        CACHE PATH
        "Directory where executables will go in the build tree")

    # Set the path were all test executables will go
    set(TEST_OUTPUT_DIRECTORY
        ${PROJECT_BINARY_DIR}/tests
        CACHE PATH
        "Directory where test executables will go in the build tree")

    # Set the path were all example test executables will go
    set(EXAMPLE_OUTPUT_DIRECTORY
        ${PROJECT_BINARY_DIR}/examples
        CACHE PATH
        "Directory where example executables will go in the build tree")

    # Set the Fortran module directory
    set(CMAKE_Fortran_MODULE_DIRECTORY
        ${PROJECT_BINARY_DIR}/lib/fortran
        CACHE PATH
        "Directory where all Fortran modules will go in the build tree")

    # Mark as advanced
    mark_as_advanced(
       LIBRARY_OUTPUT_PATH
       CMAKE_RUNTIME_OUTPUT_DIRECTORY
       CMAKE_Fortran_MODULE_DIRECTORY)

    ################################
    # Global variables needed by BLT
    #
    ################################
    set(BLT_C_FILE_EXTS ".cpp" ".hpp" ".cxx" ".hxx" ".cc" ".c" ".h" ".hh" ".inl" ".cu"
               CACHE LIST "List of known file extensions used for C/CXX sources")
    set(BLT_Fortran_FILE_EXTS ".F" ".f" ".f90" ".F90"
               CACHE LIST "List of known file extensions used for Fortran sources")


    ################################
    # Setup compiler options
    # (must be included after HEADER_INCLUDES_DIRECTORY and MPI variables are set)
    ################################
    include(${BLT_ROOT_DIR}/cmake/SetupCompilerOptions.cmake)

    ################################
    # Setup code metrics -
    # profiling, code coverage, etc.
    # (must be included after SetupCompilerOptions)
    ################################
    include(${BLT_ROOT_DIR}/cmake/SetupCodeMetrics.cmake)

    ################################
    # builtin third party libs used by BLT
    ################################
    add_subdirectory(${BLT_ROOT_DIR}/thirdparty_builtin ${BLT_BUILD_DIR}/thirdparty_builtin)

    ################################
    # BLT smoke tests
    ################################
    if(ENABLE_TESTS)
        add_subdirectory(${BLT_ROOT_DIR}/tests/smoke ${BLT_BUILD_DIR}/tests/smoke)
    endif()

endif() # only load BLT once!
