#!/bin/sh

# Author: Andrew Lee <andrew@reticent.io>
#
# A shell script for deploying Meteor applications.
# Updates fibers@1.0.5 to fibers@1.0.13 to maintain compatibility
# with Node.js 4.4.7 (currently supported LTS). fibers@1.0.5 is no
# longer supported as of September 2016 however Meteor continues to
# use it when building bundles.
#
# This script will also upgrade Meteor's bundled BCrypt package to
# the latest available version.
#
# In order to use this script, you must set your APPLICATION_PATH.
# You can do so by using `export APPLICATION_PATH=xxx`
#
# You can choose to specify a working directory when executing this script.
# Your chosen directory path should be in the form of an absolute path.
# If you do not specify a path this script will use the current directory
# as the working directory.
#
# WARNING:
# This script assumes your deployment platform is the same as your build platform.
# If you execute this script on a Linux 64-bit machine then this script
# will build your Meteor application for Linux 64-bit. You can specify your
# deployment platform by editing the `build_meteor` function within
# this file.
#
# Dependencies:
# - Node.js 4.4.7
# - NPM
# - Meteor

if [ $(whoami) != 'root' ]
then
    echo 'You must run this script as root.'
    exit
fi

# Check Node version.
if [ command -v node >/dev/null 2>&1 ] || [ $(node -v) != "v4.4.7" ]
then
    echo 'Missing dependency: Node.js 4.4.7'
    exit
else
    echo 'Found Node.js 4.4.7'
fi

if [ command -v npm >/dev/null 2>&1 ]
then
    echo 'Missing dependency: NPM'
    exit
else
    echo 'Found NPM'
    echo 'Updating NPM'

fi

# Check for Meteor.
if [ command -v meteor >/dev/null 2>&1 ]
then
    echo 'Missing dependency: Meteor'
else
    echo 'Found Meteor'
fi

# Check for application root.
APPLICATION_PATH="${APPLICATION_PATH:?Meteor application path not set or empty Try exporting APPLICATION_PATH and executing with \"sudo -E\".}"

# Set current working directory.
if [ -n "$1" ]
then
    WORKING_DIR="$1"
    echo 'Working directory specified'
else
    WORKING_DIR=$(pwd)
    echo 'Using current directory as working directory'
fi

echo "WORKING_DIR=$WORKING_DIR"

build_meteor()
{
    cd $APPLICATION_PATH
    echo 'Building Meteor application'
    meteor build $WORKING_DIR/build --directory
}

fix_meteor()
{
    if [ ! -d $WORKING_DIR/build/bundle ]
    then
        echo 'No bundle found in build directory'
        exit
    fi

    cd $WORKING_DIR/build/bundle/programs/server

    echo 'Correcting generated Node.js dependencies'
    rm -f npm-shrinkwrap.json
    sed -i -- 's/"fibers": "1.0.5"/"fibers": "1.0.13"/' package.json

    echo 'Installing Node.js dependencies'
    npm install

    echo 'Updating bundled BCrypt package'
    cd npm/npm-bcrypt
    npm update
}

end_script()
{
    tar -czvf $WORKING_DIR/build/application.tar.gz $WORKING_DIR/build/bundle
    echo "Application built, updated, and repackaged at $WORKING_DIR/build/application.tar.gz"
    echo "Application may be deployed by executing \"tar -xvcf application.tar.gz; cd bundle; node index.js"
    exit
}

if [ -d $WORKING_DIR/build ]
then
    read -p 'Found existing build directory. Would you like to continue using the existing build directory? (y/n) ' use_existing_build

    if [ $use_existing_build = 'y' ]
    then
        fix_meteor
        end_script
    elif [ $use_existing_build != 'n' ]
    then
        echo 'Invalid option specified'
        exit
    fi

    rm -rf $WORKING_DIR/build
fi

build_meteor
fix_meteor
end_script