#----------------------------------*-sh-*--------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2017-2018 OpenCFD Ltd.
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, licensed under GNU General Public License
#     <http://www.gnu.org/licenses/>.
#
# Script
#     cmakeFunctions
#
# Description
#     Helper functions for CMake
#------------------------------------------------------------------------------

# Source the wmake functions
. $WM_PROJECT_DIR/wmake/scripts/wmakeFunctions

# Ensure CMake gets the correct C/C++ compilers
[ -n "$WM_CC" ]  && export CC="$WM_CC"
[ -n "$WM_CXX" ] && export CXX="$WM_CXX"


#------------------------------------------------------------------------------

#
# Check sentinel file(s) to handle paraview / vtk version changes
#
sameDependency()
{
    local depend="$1"
    local sourceDir="$2"
    local objectsDir sentinel prev

    # Where generated files are stored
    objectsDir=$(findObjectDir "$sourceDir") || exit 1 # Fatal
    sentinel="$objectsDir/ThirdParty"

    echo $sentinel

    if read -r prev 2>/dev/null < $sentinel
    then
        if [ "$prev" = "$depend" ]
        then
            return 0
        else
            echo "${depend%=*} changed between builds" 1>&2
            return 1
        fi
    elif [ -f "$objectsDir/CMakeCache.txt" ]
    then
        echo "previous build was incomplete" 1>&2
        return 1
    else
        return 0
    fi
}


# CMake with output suppressed according to WM_QUIET
_cmake()
{
    echo "cmake..."
    if [ -n "$WM_QUIET" ]
    then
        cmake -DCMAKE_RULE_MESSAGES=OFF $@ >/dev/null
    else
        cmake $@
    fi
}


# CMake into objectsDir with external dependency
# - use sentinel file(s) to handle paraview/vtk version changes
cmakeVersioned()
{
    local depend="$1"
    local sourceDir="$2"
    local objectsDir sentinel

    # Where generated files are stored
    objectsDir=$(findObjectDir "$sourceDir") || exit 1 # Fatal

    # Version changed
    sentinel=$(sameDependency "$depend" "$sourceDir") || \
        rm -rf "$objectsDir" > /dev/null 2>&1

    mkdir -p $objectsDir \
    && (cd $objectsDir && _cmake $sourceDir && make) \
    && echo "$depend" >| "${sentinel:-/dev/null}"
}


# CMake into objectsDir with VTK_DIR dependency
cmakeVtk()
{
    cmakeVersioned "VTK_DIR=$VTK_DIR" "$1"
}


# CMake into objectsDir with ParaView_DIR dependency
cmakePv()
{
    cmakeVersioned "ParaView_DIR=$ParaView_DIR" "$1"
}


#
# Build library - use sentinel file(s) to handle paraview version changes
#
wmakeLibPv()
{
    local depend="ParaView_DIR=$ParaView_DIR"
    local sentinel

    for libName
    do
        sentinel=$(sameDependency "$depend" $libName) || \
            wclean $libName

        wmake $targetType $libName \
        && echo "$depend" > ${sentinel:-/dev/null}
    done
}


#
# There are several prerequisites for building plugins
#
canBuildPlugin()
{
    [ -d "$ParaView_DIR" -a -r "$ParaView_DIR" ] || {
        echo "==> cannot build ParaView plugins without paraview directory"
        echo "    ParaView_DIR=$ParaView_DIR"
        return 1
    }

    [ -n "$PV_PLUGIN_PATH" ] || {
        echo "==> ${PWD##*/} : invalid PV_PLUGIN_PATH for building ParaView plugins"
        echo "    PV_PLUGIN_PATH=${PV_PLUGIN_PATH:-unset}"
        return 1
    }

    [ -d "$ParaView_INCLUDE_DIR" ] && \
    [ -f "$ParaView_INCLUDE_DIR/pqServerManagerModel.h" ] || {
        echo "==> cannot build ParaView plugins without an include directory"
        echo "    ... or without GUI support"
        echo "    ParaView_INCLUDE_DIR=$ParaView_INCLUDE_DIR"
        return 1
    }

    command -v cmake > /dev/null 2>&1 || {
        echo "==> cannot build ParaView plugins without cmake"
        return 1
    }

    return 0 # success
}


#------------------------------------------------------------------------------