#!/usr/bin/env bash
# You may redistribute this program 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.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

PLATFORM=`uname | tr '[:upper:]' '[:lower:]'`
MARCH=`echo $(uname -m) | sed "s/i./x/g"`
BUILDDIR="build_${PLATFORM}"
NODE_MIN_VER="v0.8.15"

hasOkNode()
{
    NODE=`which node` || NODE=`which nodejs`
    if [ -f "${BUILDDIR}/nodejs/node/bin/node" ]; then
        NODE="`pwd`/${BUILDDIR}/nodejs/node/bin/node"
    fi
    [[ "${NODE}" == "" ]] && return 1;
    [ `${NODE} -v | sed 's/[^[0-9]/0000/g'` -ge \
      `echo "${NODE_MIN_VER}" | sed 's/[^[0-9]/0000/g'` ] && return 0
    echo "You have a version of node but it is too old";
    return 1
}

getNode()
{
    echo "Installing node.js"
    echo "You can bypass this step by manually installing node.js ${NODE_MIN_VER} or newer"
    if [ "${PLATFORM}-${MARCH}" = "linux-x86_64" ]; then
        NODE_DOWNLOAD="http://nodejs.org/dist/v0.10.24/node-v0.10.24-linux-x64.tar.gz"
        NODE_SHA="6ef93f4a5b53cdd4471786dfc488ba9977cb3944285ed233f70c508b50f0cb5f"
    elif [ "${PLATFORM}-${MARCH}" = "linux-x86" ]; then
        NODE_DOWNLOAD="http://nodejs.org/dist/v0.10.24/node-v0.10.24-linux-x86.tar.gz"
        NODE_SHA="fb6487e72d953451d55e28319c446151c1812ed21919168b82ab1664088ecf46"
    elif [ "${PLATFORM}-${MARCH}" = "darwin-x86_64" ]; then
        NODE_DOWNLOAD="http://nodejs.org/dist/v0.10.24/node-v0.10.24-darwin-x64.tar.gz"
        NODE_SHA="c1c523014124a0327d71ba5d6f737a4c866a170f1749f8895482c5fa8be877b0"
    elif [ "${PLATFORM}-${MARCH}" = "darwin-x86" ]; then
        NODE_DOWNLOAD="http://nodejs.org/dist/v0.10.24/node-v0.10.24-darwin-x86.tar.gz"
        NODE_SHA="8b8d2bf9828804c3f8027d7d442713318814a36df12dea97dceda8f4aff42b3c"
    elif [ "${PLATFORM}-${MARCH}" = "sunos-x86_64" ]; then
        NODE_DOWNLOAD="http://nodejs.org/dist/v0.10.24/node-v0.10.24-sunos-x64.tar.gz"
        NODE_SHA="7cb714df92055b93a908b3b6587ca388a2884b1a9b5247c708a867516994a373"
    elif [ "${PLATFORM}-${MARCH}" = "sunos-x86" ]; then
        NODE_DOWNLOAD="http://nodejs.org/dist/v0.10.24/node-v0.10.24-sunos-x86.tar.gz"
        NODE_SHA="af69ab26aae42b05841c098f5d11d17e21d22d980cd32666e2db45a53ddffe34"
    else
        echo "No nodejs executable available for ${PLATFORM}-${MARCH}"
        echo -n "Please install nodejs (>= ${NODE_MIN_VER}) from "
        echo "your distribution package repository or from source."
        exit 1
    fi

    origDir=`pwd`
    [ -d "${BUILDDIR}/nodejs" ] && rm -r "${BUILDDIR}/nodejs"
    mkdir -p "${BUILDDIR}/nodejs"
    cd "${BUILDDIR}/nodejs"

    APP=`which wget || which curl || echo 'none'`
    [ "$APP" = 'none' ] && echo 'Need wget or curl' && exit 1;
    [ "x$APP" = x`which wget` ] && $APP ${NODE_DOWNLOAD}
    [ "x$APP" = x`which curl` ] && $APP ${NODE_DOWNLOAD} > node.tar.gz

    ${SHA256SUM} ./*.tar.gz | grep ${NODE_SHA} || exit 1
    tar -xzf *.tar.gz
    find ./ -mindepth 1 -maxdepth 1 -type d -exec mv {} node \;
    cd $origDir
    hasOkNode && return 0;
    return 1;
}

die() {
    echo "ERROR: $1"
    exit 1
}

# get a sha256sum implementation.
getsha256sum() {
    expected="4ee73c05d5158b0fdfec9f5e52cab3fa85b98d6992a221bbff28fdbd935e8afc"
    testFile=test/$expected
    for hasher in sha256sum gsha256sum 'shasum -a 256' 'openssl sha256'
    do
        #echo "trying ${hasher} ${testFile}"
        ${hasher} ${testFile} 2>/dev/null | grep -q ${expected} && SHA256SUM=${hasher} && return 0
    done
    return 1
}

main() {
    [ `dirname $0` ] && cd `dirname $0` || die "failed to set directory"
    [ -d ${BUILDDIR} ] || mkdir ${BUILDDIR} || die "failed to create build dir ${BUILDDIR}"
    getsha256sum || die "couldn't find working sha256 hasher";
    hasOkNode || getNode || die "could not get working nodejs impl";

    $NODE ./node_build/make.js $@ || return 1
}

main