#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# nodejs functions
#
# License
# =======
#
# Copyright (C) 2014-2016 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# For reasons unknown we initially have to upgrade to an intermediate version
# before getting to the version we want

VARIANTS='mesh'

# change these versions at your peril. Things will often crash if you don't
# have specifically the correct versions
NODEJS_VERSION='6.10.1'
NODEJS_N_VERSION='2.1.7'
NPM_VERSION='4.0.5'

# This file keeps track of the apps needing nodejs
# so that it can be removed if tere are no apps which need it
NODEJS_INSTALLED_APPS_FILE=$HOME/.nodejs-apps

function mesh_install_nodejs {
    chroot "${rootdir}" apt-get -yq install nodejs
    chroot "${rootdir}" apt-get -yq install npm curl

    if [ ! -f ${rootdir}/usr/bin/nodejs ]; then
        echo $'nodejs was not installed'
        exit 63962
    fi

    cat <<EOF > ${rootdir}/root/install-nodejs.sh
#!/bin/bash
PATH="/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/bin"
NODE_PATH="/usr/lib/node_modules"
cp /usr/bin/nodejs /usr/local/bin/node
cp /usr/bin/nodejs /usr/bin/node
/usr/bin/curl -0 -L https://npmjs.org/install.sh | sh
npm install -g n@${NODEJS_N_VERSION} --save
n ${NODEJS_VERSION}
exit 0
EOF
    chroot "${rootdir}" chmod +x /root/install-nodejs.sh
    chroot "${rootdir}" /root/install-nodejs.sh
    if [ ! "$?" = "0" ]; then
        chroot "${rootdir}" rm -f /root/install-nodejs.sh
        exit 7632572
    fi
    chroot "${rootdir}" rm -f /root/install-nodejs.sh
}

function remove_nodejs {
    if [ ! $1 ]; then
        return
    fi
    if [ ! -f $NODEJS_INSTALLED_APPS_FILE ]; then
        remove_app nodejs
        return
    fi
    sed -i "/install_${1}/d" $NODEJS_INSTALLED_APPS_FILE
    if ! grep "install_" $NODEJS_INSTALLED_APPS_FILE; then
        apt-get -yq remove --purge nodejs

        if [ -f /usr/bin/nodejs ]; then
            rm /usr/bin/nodejs
        fi
        if [ -f /usr/local/bin/node ]; then
            rm /usr/local/bin/node
        fi
        if [ -f /usr/bin/node ]; then
            rm /usr/bin/node
        fi
        if [ -d /usr/lib/node_modules ]; then
            rm -rf /usr/lib/node_modules
        fi
        if [ -f /usr/bin/n ]; then
            rm /usr/bin/n
        fi

        remove_app nodejs

        rm $NODEJS_INSTALLED_APPS_FILE

        apt-get -yq autoremove
    fi
}

function upgrade_nodejs {
    CURR_NODE_VERSION=$(node --version)
    CURR_NPM_VERSION=$(npm --version)
    CURR_N_VERSION=$(n --version)
    if [[ "$CURR_NPM_VERSION" != "$NPM_VERSION" ]]; then
        npm upgrade -g npm@${NPM_VERSION} --save
    fi
    if [[ "$CURR_N_VERSION" != "$NODEJS_N_VERSION" ]]; then
        npm upgrade -g n@${NODEJS_N_VERSION} --save
    fi
    if [[ "$CURR_NODE_VERSION" != "$NODEJS_VERSION" ]]; then
        n {NODEJS_VERSION}
    fi
    cp /usr/local/bin/n /usr/bin/n
    cp /usr/local/bin/npm /usr/bin/npm
    cp /usr/local/bin/node /usr/bin/nodejs
    cp /usr/local/bin/node /usr/bin/node
}

function install_nodejs {
    if [ $INSTALLING_MESH ]; then
        mesh_install_nodejs
        return
    fi
    if [[ $(is_completed $FUNCNAME) == "1" ]]; then
        upgrade_nodejs
        return
    fi

    apt-get -yq install nodejs
    apt-get -yq install npm curl

    if [ ! -f /usr/bin/nodejs ]; then
        echo $'nodejs was not installed'
        exit 63962
    fi

    cat <<EOF > /root/install-nodejs.sh
#!/bin/bash
PATH="/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/bin"
NODE_PATH="/usr/lib/node_modules"
cp /usr/bin/nodejs /usr/local/bin/node
cp /usr/bin/nodejs /usr/bin/node
/usr/bin/curl -0 -L https://npmjs.org/install.sh | sh
npm install -g n@${NODEJS_N_VERSION} --save
if [ ! -f /usr/local/bin/n ]; then
    exit 1
fi
cp /usr/local/bin/n /usr/bin/n
n ${NODEJS_VERSION}
if [ ! -f /usr/local/bin/node ]; then
    exit 2
fi
cp /usr/local/bin/node /usr/bin/nodejs
cp /usr/local/bin/node /usr/bin/node
npm install -g npm@${NPM_VERSION} --save
if [ ! -f /usr/local/bin/npm ]; then
    exit 3
fi
cp /usr/local/bin/npm /usr/bin/npm
npm install -g pug@2.0.0-beta6 --save
npm install -g graceful-fs@4.1.10 --save
npm install -g minimatch@3.0.3 --save
exit 0
EOF
    chmod +x /root/install-nodejs.sh
    /root/install-nodejs.sh
    if [ ! "$?" = "0" ]; then
        rm -f /root/install-nodejs.sh
        exit 7632572
    fi
    rm -f /root/install-nodejs.sh

    # second npm install attempt seems necessary
    npm install -g npm@${NPM_VERSION} --save
    cp /usr/local/bin/npm /usr/bin/npm

    # node seems tricky so here we're going to double check
    # that the versions we expect did get installed
    CURR_NODE_VERSION=$(node --version)
    CURR_NPM_VERSION=$(npm --version)
    CURR_N_VERSION=$(n --version)
    if [[ "$CURR_NPM_VERSION" != "$NPM_VERSION" ]]; then
        echo $"Expected npm version $NPM_VERSION but actually have $CURR_NPM_VERSION"
        exit 6728252
    fi
    if [[ "$CURR_N_VERSION" != "$NODEJS_N_VERSION" ]]; then
        echo $"Expected n version $NODEJS_N_VERSION but actually have $CURR_N_VERSION"
        exit 5267452
    fi
    if [[ "$CURR_NODE_VERSION" != "$NODEJS_VERSION" ]]; then
        echo $"Expected node version $NODEJS_VERSION but actually have $CURR_NODE_VERSION"
        exit 5274527
    fi

    if [ $1 ]; then
        if ! grep "install_${1}" $NODEJS_INSTALLED_APPS_FILE; then
            echo "install_${1}" >> $NODEJS_INSTALLED_APPS_FILE
        fi
    fi

    mark_completed $FUNCNAME
}

# NOTE: deliberately there is no "exit 0"