#!/bin/sh
#
# deploy foodsoft to heroku
#
# To be run from foodsoft's root. A new temporary git branch will be created
# from the current working directory - it's safest to run this with a clean
# working directory.
#
# Use environment variables to customize variables below.
# You need to have a working heroku client.
#

# rails environment to deploy
[ "$RAILS_ENV" ] || RAILS_ENV=production
# heroku application name
[ "$APP" ] || APP=foodsoft-translation
# heroku region to create application in
[ "$REGION" ] || REGION=eu


# make sure required software is available
if ! heroku >/dev/null 2>&1; then
	echo "Please install heroku." 1>&2
	exit 1
fi
if ! git version >/dev/null 2>&1; then
	echo "Please install git." 1>&2
	exit 1
fi
# required settings
if [ "$RAILS_ENV" = "translation" -a ! "$LOCALEAPP_KEY" ]; then
	echo "Need to specify LOCALEAPP_KEY key for translation environment" 1>&2
	exit 1
fi

# create app if it doesn't exist
if ! heroku apps | grep -q "^$APP\s"; then
	heroku create "$APP" --region "$REGION"
	heroku addons:add heroku-postgresql:dev --app "$APP"
	heroku pg:promote `heroku config | grep 'HEROKU_POSTGRESQL_.*_URL' | cut -d: -f1`
fi
heroku config:set RACK_ENV="${RAILS_ENV}" RAILS_ENV="${RAILS_ENV}" --app "$APP"

# create temporary branch with heroku-specific changes
touch ._tmp_havestash
OLDSTASH=`git stash list | wc -l`
git stash save -q -a "stored changes before creating heroku-$APP"
ORIG_BRANCH=`git status --b --porcelain | head -n 1 | sed 's|^#*\s*||;s|\.\.\..*$||'`
BRANCH="_tmp-heroku-$APP"
if ! git checkout -b "$BRANCH"; then
	echo "Could not create to temporary branch '$BRANCH', aborting." 1>&2
	exit 1
fi
# remove sqlite3 dependency as it doesn't install on heroku
sed -i "s|^\\(\\s*gem\\s\\+'sqlite3'\\)|#\1|" Gemfile
sed -i "s|^\\(\\s*sqlite3\\b\)|#\1|" Gemfile.lock
# make sure postgresql db is present, as it is the default heroku db
echo "\ngem 'pg'" >>Gemfile
echo "\ngem 'localeapp'" >>Gemfile
# always use unicorn
echo "\ngem 'unicorn'" >>Gemfile
echo 'web: bundle exec unicorn -p $PORT -E $RACK_ENV' >Procfile
bundle install --quiet # to update Gemfile.lock
# do not ignore deployment files
sed -i 's|^\(config/\*.yml\)|#\1|' .gitignore
sed -i 's|^\(config/initializers/secret_token.rb\)|#\1|' .gitignore
sed -i 's|^\(config/environments/development.rb\)|#\1|' .gitignore
# make sure we have a full configuration
# TODO pull this from heroku when exists?
if [ ! -e config/app_config.yml ]; then
	echo "config/app_config.yml not present, copying config/app_config.yml.SAMPLE"
	cp config/app_config.yml.SAMPLE config/app_config.yml
fi
# keep secret token from currently deployed app, else generate new one
heroku git:remote --app="$APP" >/dev/null 2>&1
if git show heroku/master:config/initializers/secret_token.rb >/dev/null 2>&1; then
	git show heroku/master:config/initializers/secret_token.rb >config/initializers/secret_token.rb
else
	cat >config/initializers/secret_token.rb <<-EOF
		# auto-generated secret key
		Foodsoft::Application.config.secret_token = '`openssl rand -hex 128`'
	EOF
fi
# special environment hooks
if [ "$LOCALEAPP_KEY" ]; then
	# configure localeapp, manually to include environment
	cat >config/initializers/localeapp.rb <<EOF
require 'localeapp/rails'

Localeapp.configure do |config|
  config.api_key = '$LOCALEAPP_KEY'
  config.sending_environments = ['$RAILS_ENV']
  config.polling_environments = ['$RAILS_ENV']
end
EOF
	bundle exec localeapp pull
fi
# TODO add more extensive database seed

# and push = deploy
git add -A
git commit -q -m "heroku changes for environment ${RAILS_ENV}" -a
git push -f heroku $BRANCH:master
# create/update database
if !heroku run rake db:version >/dev/null 2>&1; then
	heroku run rake db:setup
else
	heroku run rake db:migrate
fi

# return to original branch
git checkout -q "$ORIG_BRANCH" && git stash pop -q
git branch -q -D "$BRANCH"
rm -f ._tmp_havestash