#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | foam-extend: Open Source CFD
#  \\    /   O peration     | Version:     4.1
#   \\  /    A nd           | Web:         http://www.foam-extend.org
#    \\/     M anipulation  | For copyright notice see file Copyright
#------------------------------------------------------------------------------
# License
#     This file is part of foam-extend.
#
#     foam-extend is free software: you can redistribute it and/or modify it
#     under the terms of the GNU General Public License as published by the
#     Free Software Foundation, either version 3 of the License, or (at your
#     option) any later version.
#
#     foam-extend is distributed in the hope that it will be useful, but
#     WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#     General Public License for more details.
#
#     You should have received a copy of the GNU General Public License
#     along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.
#
# Script
#     foamSystemCheck
#
# Description
#     Checks the machine system and the user's
#     personal configuration for running OpenFOAM.
#
#------------------------------------------------------------------------------

# STATIC VARIABLES
# ~~~~~~~~~~~~~~~~
FOAM_VERSION=1.6-ext

HLINE="-----------------------------------------------------------------------"
WIDTH=16
unset FATALERROR

# FUNCTIONS
# ~~~~~~~~~
heading () {
    echo ""
    echo "$1"
    echo "$HLINE"
}

lenBase () {
    echo $1 | tr -d " " | wc -m | tr -d " "
}

length () {
    NOCHAR=$(lenBase $1)
    NOCHAR=$(expr $NOCHAR - 1)
    if [ $NOCHAR -eq -1 ]
    then
        NOCHAR=0
    fi
    echo $NOCHAR
}

fixlen () {
    WORD=$1
    ONELEN=$(length "$1")
    LDIFF=$(expr $ONELEN - $2)
    if [ $LDIFF -le 1 ]
    then
        while [ $LDIFF -lt 0 ]
        do
            WORD="$WORD "
            LDIFF=$(expr $LDIFF + 1)
        done
        echo "$WORD"
    else
        LDIFF=$(expr $LDIFF + 4)
        WORD=$(echo "$WORD" | cut -c${LDIFF}-)
        echo "...${WORD}"
    fi
}

# MAIN CODE
# ~~~~~~~~~
heading "Checking basic system..."

# check shell
echo "$(fixlen "Shell:" $WIDTH) $SHELL"
case "$SHELL" in
*/csh | */tcsh)
    USER_CONFIG_TYPE=cshrc
    ;;
*/bash | */ksh)
    USER_CONFIG_TYPE=bashrc
    ;;
*)
    USER_CONFIG_TYPE=""
    echo "FATALERROR: Cannot identify the current shell."
    echo "            OpenFOAM ${FOAM_VERSION} is compatible"
    echo "            with csh, tcsh, ksh and bash."
    echo
    FATALERROR=yes
    ;;
esac

# check hostname
HOST=$(uname -n)
echo "$(fixlen "Host:" $WIDTH) $HOST"
if [ $(length $HOST) -eq 0 ]
then
    echo "FATALERROR: Cannot stat hostname."
    echo "            OpenFOAM ${FOAM_VERSION} needs a valid hostname to function."
    echo "            Contact your system administrator. "
    echo
    FATALERROR=yes
fi

# check os
OS=$(uname -s)
case "$OS" in
Linux | LinuxAMD64 | SunOS )
    echo "$(fixlen "OS:" $WIDTH) ${OS} version $(uname -r)"
    ;;
*)
    echo "FATALERROR: Incompatible operating system \"$OS\"."
    echo "            OpenFOAM ${FOAM_VERSION} is currently available for "
    echo "            Linux, LinuxAMD64 and SunOS only."
    echo
    FATALERROR=yes
    ;;
esac


# check user name
USER_NAME=$LOGNAME
if [ $(length $USER_NAME) -eq 0 ]
then
    USER_NAME=$USER
fi

echo "$(fixlen "User:" $WIDTH) ${USER_NAME}"
if [ $(length $USER_NAME) -eq 0 ]
then
    echo "FATALERROR: Cannot stat user name ${USER_NAME}."
    echo "            OpenFOAM ${FOAM_VERSION} needs a valid user name."
    echo "            Contact your system administrator. "
    echo ""
    FATALERROR=yes
fi


echo ""
echo ""
if [ -n "$FATALERROR" ]
then
    echo "System check: FAIL"
    echo "=================="
    echo "Your system is not currently compatible with OpenFOAM installation "
    echo "requirements. Review the error messages and consult the documentation"
    echo "for further instructions."
    echo
else
    echo "System check: PASS"
    echo "=================="
    echo "Continue OpenFOAM installation."
    echo
fi

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