#!/bin/bash
#
# Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
#  http://aws.amazon.com/apache2.0
#
# or in the "license" file accompanying this file. This file is distributed
# on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
# express or implied. See the License for the specific language governing
# permissions and limitations under the License.
#
set -e

BROWSER_BUNDLE_DIR=browser

#
# Make sure that browserify is available.
#
BROWSERIFY=`which browserify`
if [ $? -ne 0 ]; then
    echo ${0##*/}": browserify is not available, please install, e.g. npm install -g browserify"
    exit 1
fi

#
# Make sure that npm is available.
#
NPM=`which npm`
if [ $? -ne 0 ]; then
    echo ${0##*/}": npm is not available, please install"
    exit 2
fi

#
# Verify that npm is at least version 3 (this script won't work with previous
# versions).
#
NPM_MAJOR_VERSION=`npm -v | cut -d'.' -f1`
if [ $NPM_MAJOR_VERSION"" -lt 3 ]; then
    echo ${0##*/}": npm must be at least version 3 (installed npm version:"$NPM_MAJOR_VERSION")"
    exit 3
fi

#
# Make sure we are in the right directory by verifying the presence of a couple of files
#
if [ ! -f "README.md" ] || [ ! -f "thing/index.js" ] || [ ! -d $BROWSER_BUNDLE_DIR ]; then
    echo ${0##*/}": this script must be run in the package top-level directory"
    exit 4
fi

#
# Check to see if the SDK browser bundle exists; if it does not, we'll create the browser
# bundle to be used by other applications.
#
if [ ! -f $BROWSER_BUNDLE_DIR/aws-iot-sdk-browser-bundle.js ]; then
#
# Prepare the bundle by doing an npm install in the browser bundle directory.  Note
# that we use this copy of the SDK files rather than pulling them from npm, so that
# we can easily work with local changes, if necessary.
#
    (cd $BROWSER_BUNDLE_DIR; tar cvzf aws-iot-device-sdk.tgz --exclude ${PWD##*/} --exclude node_modules --exclude .git --exclude .github --exclude .coverdata --exclude debug --exclude examples --exclude reports --exclude test -C ../ .; mkdir -p node_modules/aws-iot-device-sdk; (cd node_modules/aws-iot-device-sdk; tar xvzf ../../aws-iot-device-sdk.tgz); npm install)
#
# Create the browser bundle and delete all working files/directories.  Allow
# aws-iot-device-sdk and aws-sdk to be required by other browserify bundles.
#
    (cd $BROWSER_BUNDLE_DIR; rm -f bundle.js; $BROWSERIFY -r aws-iot-device-sdk -r aws-sdk -o aws-iot-sdk-browser-bundle.js; rm -rf node_modules; rm -f aws-iot-device-sdk.tgz)
    echo ${0##*/}": prepared browser bundle"
fi

#
# Check to see how many arguments are available; if one argument is available, we'll
# browserify that file using external references to aws-sdk and aws-iot-device-sdk and
# place the result in that directory under 'bundle.js'. If two arguments are available
# we'll use the second argument as the bundle output file. Finally, we'll copy the browser
# bundle into the application directory so that it's available for use.
#
if [ $# -eq 0 ]; then
    exit 0
elif [ $# -eq 1 ] || [ $# -eq 2 ]; then
#
# Browserify another app using external references to aws-sdk and aws-iot-device-sdk.
#
   if [ ! -f $1"" ]; then
      echo ${0##*/}": can't browserify ("$1") because it's not a file or does not exist"
      exit 5
   fi

   APP_PATH=${1%/*}""
   APP_NAME=${1##*/}""
   OUTPUT_FILE=bundle.js

   if [ $# -eq 2 ] && [ $2"" != "" ]; then
      OUTPUT_FILE=${2##*/}
   fi

   echo "browserifying "$1" and placing result in "$APP_PATH/$OUTPUT_FILE"..."
   (cd $APP_PATH""; $BROWSERIFY -x aws-sdk -x aws-iot-device-sdk $APP_NAME -o $OUTPUT_FILE)
   cp $BROWSER_BUNDLE_DIR/aws-iot-sdk-browser-bundle.js $APP_PATH
else
   echo "Usage: "${0##*/}" [javascript application] [output file]"
   exit 6
fi

exit 0