#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
#     Copyright (C) 2011 OpenFOAM Foundation
#     Copyright (C) 2018-2019 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
#
# Script
#     foamNewCase
#
# Description
#     Create a new case from a template for particular applications
#     - requires rsync
#
# Environment
#     FOAM_API
#     WM_PROJECT_DIR
#     WM_PROJECT_SITE
#
#------------------------------------------------------------------------------
groupDir="${WM_PROJECT_SITE:-${WM_PROJECT_DIR:-<unknown>}/site}"
userDir="$HOME/.OpenFOAM"
projectApi="${FOAM_API:-unknown}"

templateDir="appTemplates"

#------------------------------------------------------------------------------
usage() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    cat<<USAGE

Usage: ${0##*/} [OPTION]
options:
  -app NAME         specify the application to use
  -case DIR         specify alternative case directory, default is the cwd
  -list             list the applications available
  -with-api=NUM     specify alternative api to use (default: \$FOAM_API)
  -version VER      [obsolete]
  -help             Print the usage

clone initial application settings to the specified case from
    $userDir/$templateDir/{$projectApi,}/APP
    $groupDir/$templateDir/{$projectApi,}/APP

USAGE
    exit 1
}
#------------------------------------------------------------------------------
unset appName caseName optList

# parse options
while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help*)
        usage
        ;;
    -app)
        [ "$#" -ge 2 ] || usage "'$1' option requires an argument"
        appName="$2"
        shift
        ;;
    -case)
        [ "$#" -ge 2 ] || usage "'$1' option requires an argument"
        caseName="$2"
        shift
        ;;
    -l | -list)
        optList=true
        ;;
    -v | -ver | -version)
        [ "$#" -ge 2 ] || usage "'$1' option requires an argument"
        echo "ignored defunct option -version" 1>&2
        shift
        ;;
    -with-api=*)
        projectApi="${1#*=}"
        ;;
    -*)
        usage "unknown option: '$*'"
        ;;
    *)
        usage "unexpected argument: '$*'"
        ;;
    esac
    shift
done

# need rsync, except for when listing
command -v rsync >/dev/null 2>&1 || \
   [ "$optList" = true ] || usage "Error: 'rsync' seems to be missing"


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

#
# find apps in current directory
# considered an app if it has constant/ and system/ directories
#
findApps()
{
    for app in $(/bin/ls -d * 2>/dev/null)
    do
        [ -d "$app/constant" -a -d "$app/system" ] && echo "$app"
    done
}


appList=$(
    for dir in "$userDir/$templateDir" "$groupDir/$templateDir"
    do
        if cd "$dir" 2>/dev/null
        then
            findApps                              ## generic

            ## version-specific
            if [ -n "$projectApi" ]
            then
                cd "$projectApi" 2>/dev/null && findApps
            fi
        fi
    done | sort | uniq
)


listApps()
{
    echo
    echo "applications available:"
    for i in $appList
    do
        echo "    $i"
    done
    echo
}


if [ "$optList" = true ]
then
    listApps
    exit 0
elif [ "$(echo $appList | wc -w)" -eq 0 ]
then
    echo "Error: no applications available"
    exit 1
elif [ -z "$appName" ]
then
    echo "Error: no -app specified"
    listApps
    exit 1
fi


# get the corresponding srcDir name
srcDir=$(
    for dir in "$userDir/$templateDir" "$groupDir/$templateDir"
    do
        if [ -d $dir ]
        then
            for appDir in "$dir/$projectApi/$appName" "$dir/$appName"
            do
                if [ -d $appDir -a -d $appDir/constant -a -d $appDir/system ]
                then
                    echo "$appDir"
                    break 2
                fi
            done
        fi
    done
)


[ -d "$srcDir" ] || {
    echo "Error: could not find template for $appName"
    listApps
    exit 1
}


# adjust for caseName as required
if [ -n "$caseName" ]
then
    [ -d "$caseName" ] || mkdir -p "$caseName"
    cd "$caseName" 2>/dev/null || usage "directory does not exist:  '$caseName'"
fi
newDir=$PWD


[ -d "$newDir" -a -w "$newDir" ] || {
    echo "Error: target directory does not exist or is unwritable"
    echo "    $newDir"
    exit 1
}

# add some useful subdirs:
mkdir -p $newDir/postPro


echo "    application   $appName"
echo "    source        $srcDir"
echo "    target        $newDir"

echo "    syncing ..."
# sync updated files only, itemize changes so we know what is going on
rsync -aui $srcDir/ $newDir

echo Done

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