#!/bin/bash
set -e

cd /app

# Default to the environment variable values set in .env.example
source /app/.env.example

# is a mysql or postgresql database linked?
# requires that the mysql or postgresql containers have exposed
# port 3306 and 5432 respectively.
if [ -n "${MYSQL_PORT_3306_TCP_ADDR}" ]; then
  HUGINN_DATABASE_ADAPTER=${HUGINN_DATABASE_ADAPTER:-mysql2}
  HUGINN_DATABASE_HOST=${HUGINN_DATABASE_HOST:-${MYSQL_PORT_3306_TCP_ADDR}}
  HUGINN_DATABASE_PORT=${HUGINN_DATABASE_PORT:-${MYSQL_PORT_3306_TCP_PORT}}
elif [ -n "${POSTGRESQL_PORT_5432_TCP_ADDR}" ]; then
  HUGINN_DATABASE_ADAPTER=${HUGINN_DATABASE_ADAPTER:-postgres}
  HUGINN_DATABASE_HOST=${HUGINN_DATABASE_HOST:-${POSTGRESQL_PORT_5432_TCP_ADDR}}
  HUGINN_DATABASE_PORT=${HUGINN_DATABASE_PORT:-${POSTGRESQL_PORT_5432_TCP_PORT}}
fi

grep = /app/.env.example | sed -e 's/^#\([^ ]\)/\1/' | grep -v -e '^#' | cut -d= -f1 | \
  while read var ; do
    eval "echo \"$var=\\\"\${HUGINN_$var:-\$$var}\\\"\""
  done | grep -v -e ^= > /app/.env

chmod ugo+r /app/.env
source /app/.env

DATABASE_HOST=${HUGINN_DATABASE_HOST:-${DATABASE_HOST:-localhost}}
DATABASE_ENCODING=${HUGINN_DATABASE_ENCODING:-${DATABASE_ENCODING}}
USE_GRAPHVIZ_DOT=${HUGINN_USE_GRAPHVIZ_DOT:-${USE_GRAPHVIZ_DOT}}

# use default port number if it is still not set
case "${DATABASE_ADAPTER}" in
  mysql2) DATABASE_PORT=${DATABASE_PORT:-3306} ;;
  postgres) DATABASE_PORT=${DATABASE_PORT:-5432} ;;
  *) echo "Unsupported database adapter. Available adapters are mysql2, and postgres." && exit 1 ;;
esac

# initialize supervisord config

cat > /etc/supervisor/conf.d/supervisord.conf <<EOF
[supervisord]
nodaemon = true
user = root
stdout_logfile = AUTO

[unix_http_server]
file=/var/run/supervisor.sock   ; (the path to the socket file)

[eventlistener:stdout]
command = supervisor_stdout
buffer_size = 100
events = PROCESS_LOG
result_handler = supervisor_stdout:event_handler
EOF

# prepare the supervisord bootstrap service script

cat <<BOOTSTRAP > /tmp/bootstrap.sh
#!/bin/bash -e
source /app/.env

echo DATABASE_HOST=\${DATABASE_HOST}

# start mysql server if \${DATABASE_HOST} is the .env.example default
if [ "\${DATABASE_HOST}" = "your-domain-here.com" -o "\${DATABASE_HOST}" = "" ]; then
  if [ "\${DATABASE_ADAPTER}" = "postgres" ]; then
    echo "DATABASE_ADAPTER 'postgres' is not supported internally. Please provide DATABASE_HOST."
    exit 1
  fi

  # configure supervisord to start mysql (manual)
  cat > /etc/supervisor/conf.d/mysqld.conf <<EOF
[program:mysqld]
priority=20
directory=/tmp
command=/usr/bin/mysqld_safe
user=root
autostart=false
autorestart=true
stdout_events_enabled=true
stderr_events_enabled=true
EOF
  supervisorctl reread
  supervisorctl add mysqld

  # fix permissions and ownership of /var/lib/mysql
  chown -R mysql:mysql /var/lib/mysql
  chmod 700 /var/lib/mysql

  # initialize MySQL data directory
  if [ ! -d /var/lib/mysql/mysql ]; then
    mysql_install_db --user=mysql
  fi

  echo "Starting mysql server..."
  supervisorctl start mysqld >/dev/null

  # wait for mysql server to start (max 120 seconds)
  timeout=120
  while ! mysqladmin -uroot \${DATABASE_PASSWORD:+-p\$DATABASE_PASSWORD} status >/dev/null 2>&1
  do
    (( timeout = timeout - 1 ))
    if [ \$timeout -eq 0 ]; then
      echo "Failed to start mysql server"
      exit 1
    fi
    echo -n .
    sleep 1
  done

  if ! echo "USE \${DATABASE_NAME}" | mysql -uroot \${DATABASE_PASSWORD:+-p\$DATABASE_PASSWORD} >/dev/null 2>&1; then
    DB_INIT="yes"
    echo "CREATE DATABASE IF NOT EXISTS \\\`\${DATABASE_NAME}\\\` DEFAULT CHARACTER SET \\\`utf8\\\` COLLATE \\\`utf8_unicode_ci\\\`;" | mysql -uroot \${DATABASE_PASSWORD:+-p\$DATABASE_PASSWORD}
    echo "GRANT SELECT, LOCK TABLES, INSERT, UPDATE, DELETE, CREATE, DROP, INDEX, ALTER ON \\\`${DATABASE_NAME}\\\`.* TO 'root'@'localhost';" | mysql -uroot \${DATABASE_PASSWORD:+-p\$DATABASE_PASSWORD}
  fi
fi
supervisorctl start foreman >/dev/null
BOOTSTRAP

chmod 755 /tmp/bootstrap.sh

cat > /etc/supervisor/conf.d/bootstrap.conf <<EOF
[program:bootstrap]
command=/tmp/bootstrap.sh
priority=10
directory=/app
process_name=%(program_name)s
autostart=true
autorestart=false
stdout_events_enabled=true
stderr_events_enabled=true
stopsignal=TERM
exitcodes=0
startsecs=0
stopwaitsecs=1
EOF

cat <<FOREMAN > /tmp/foreman.sh
#!/bin/bash -e
source /app/.env

# Assuming we have a created database, run the migrations and seed it idempotently.
[ -z "\${DO_NOT_MIGRATE}" ] && sudo -u huginn -EH bundle exec rake db:migrate
[ -z "\${DO_NOT_SEED}" ] && sudo -u huginn -EH bundle exec rake db:seed

[ -n "\$INTENTIONALLY_SLEEP" ] && sleep \$INTENTIONALLY_SLEEP

# Fixup the Procfile and prepare the PORT
[ -n "\${DO_NOT_RUN_JOBS}" ] && perl -pi -e 's/^jobs:/#jobs:/' /app/Procfile
perl -pi -e 's/rails server\$/rails server -b 0.0.0.0 -p \\\$PORT/' /app/Procfile
export PORT

# Start huginn
exec sudo -u huginn -EH bundle exec foreman start
FOREMAN

chmod 755 /tmp/foreman.sh

cat > /etc/supervisor/conf.d/foreman.conf <<EOF
[program:foreman]
command=/tmp/foreman.sh
priority=10
directory=/app
process_name=%(program_name)s
autostart=false
autorestart=false
stdout_events_enabled=true
stderr_events_enabled=true
stopsignal=TERM
startsecs=0
stopwaitsecs=1
EOF

# start supervisord
exec /usr/bin/supervisord -c /etc/supervisor/supervisord.conf