#!/bin/bash
#
# packager.io postinstall script functions
#

function debug() {
  if [ "${DEBUG}" == "yes" ]; then
    echo "DEBUG MODE ON"
    set -ex
  fi
}

function detect_os () {
  . /etc/os-release

  if [ "${ID}" == "debian" ] || [ "${ID}" == "ubuntu" ]; then
    OS="DEBIAN"
  elif [ "${ID}" == "centos" ] || [ "${ID}" == "fedora" ] || [ "${ID}" == "rhel" ]; then
    OS="REDHAT"
  elif [ "${ID}" == "opensuse" ] || [ "${ID}" == "sles" ] || [ "${ID}" == "suse" ]; then
    OS="SUSE"
  else
    OS="UNKNOWN"
  fi

  if [ "${DEBUG}" == "yes" ]; then
    echo "OS is ${OS} based"
  fi
}

function detect_docker() {
  if [ -n "$(grep docker < /proc/1/cgroup)" ]; then
    DOCKER="yes"
  else
    DOCKER="no"
  fi

  if [ "${DEBUG}" == "yes" ]; then
    echo "os runs in docker container = ${DOCKER}"
  fi
}

function detect_initcmd () {
  if [ -n "$(which systemctl 2> /dev/null)" ]; then
    INIT_CMD="systemctl"
  elif [ -n "$(which initctl 2> /dev/null)" ]; then
    INIT_CMD="initctl"
  else
    function sysvinit () {
      service $2 $1
    }
    INIT_CMD="sysvinit"
  fi

  if [ "${DOCKER}" == "yes" ]; then
    INIT_CMD="initctl"
  fi

  if [ "${DEBUG}" == "yes" ]; then
    echo "INIT CMD = ${INIT_CMD}"
  fi
}


function detect_database () {
  if [ -n "$(which psql 2> /dev/null)" ]; then
    ADAPTER="postgresql"
  elif [ -n "$(which mysql 2> /dev/null)" ]; then
    ADAPTER="mysql2"
  fi

  if [ "${DEBUG}" == "yes" ]; then
    echo "Use ${ADAPTER} adapter in database.yml"
  fi
}

function detect_webserver () {
  if [ -n "$(which nginx 2> /dev/null)" ] ; then
    WEBSERVER="nginx"
    WEBSERVER_CMD="nginx"
    if [ "${OS}" == "DEBIAN" ]; then
      WEBSERVER_CONF="/etc/nginx/sites-enabled/zammad.conf"
    elif [ "${OS}" == "REDHAT" ]; then
      WEBSERVER_CONF="/etc/nginx/conf.d/zammad.conf"
    elif [ "${OS}" == "SUSE" ]; then
      WEBSERVER_CONF="/etc/nginx/vhosts.d/zammad.conf"
    fi
  elif [ -n "$(which apache2 2> /dev/null)" ]; then
    WEBSERVER="apache2"
    WEBSERVER_CMD="apache2"
    if [ "${OS}" == "DEBIAN" ]; then
      WEBSERVER_CONF="/etc/apache2/sites-enabled/zammad.conf"
    fi
  elif [ -n "$(which httpd 2> /dev/null)" ]; then
    WEBSERVER="apache2"
    WEBSERVER_CMD="httpd"
    if [ "${OS}" == "REDHAT" ]; then
      WEBSERVER_CONF="/etc/httpd/conf.d/zammad.conf"
    elif [ "${OS}" == "SUSE" ]; then
      WEBSERVER_CONF="/etc/apache2/vhosts.d/zammad.conf"
    fi
  fi

  if [ "${DEBUG}" == "yes" ]; then
    echo "Webserver is ${WEBSERVER_CMD}"
  fi
}

function create_initscripts () {
  echo "# (Re)creating init scripts"
  zammad scale web=${ZAMMAD_WEBS} websocket=${ZAMMAD_WEBSOCKETS} worker=${ZAMMAD_WORKERS}

  echo "# Enabling Zammad on boot"
  ${INIT_CMD} enable zammad
}

function start_zammad () {
  echo "# Starting Zammad"
  ${INIT_CMD} start zammad
}

function stop_zammad () {
  echo "# Stopping Zammad"
  ${INIT_CMD} stop zammad
}

function create_database_password () {
  DB_PASS="$(tr -dc A-Za-z0-9 < /dev/urandom | head -c10)"
}

function create_postgresql_db () {
  if [ -n "$(which postgresql-setup 2> /dev/null)" ]; then
    echo "# Preparing postgresql server"
    postgresql-setup initdb
  fi

  echo "# Creating postgresql bootstart"
  ${INIT_CMD} enable postgresql.service

  echo "# Restarting postgresql server"
  ${INIT_CMD} restart postgresql

  echo "# Creating zammad postgresql user"
  echo "CREATE USER \"${DB_USER}\" WITH PASSWORD '${DB_PASS}';" | su - postgres -c psql

  echo "# Creating zammad postgresql db"
  su - postgres -c "createdb -E UTF8 ${DB} -O ${DB_USER}"

  echo "# Grant privileges to new postgresql user"
  echo "GRANT ALL PRIVILEGES ON DATABASE \"${DB}\" TO \"${DB_USER}\";" | su - postgres -c psql
}

function create_mysql_db () {
  if [ -f "${MY_CNF}" ]; then
    MYSQL_CREDENTIALS="--defaults-file=${MY_CNF}"
  else
    echo -n "Please enter your MySQL root password:"
    read -p 'Password: ' MYSQL_ROOT_PASS
    MYSQL_CREDENTIALS="-u root -p${MYSQL_ROOT_PASS}"
  fi

  echo "# Creating zammad mysql db"
  mysql ${MYSQL_CREDENTIALS} -e "CREATE DATABASE ${DB} DEFAULT CHARACTER SET utf8 DEFAULT COLLATE utf8_general_ci;"

  echo "# Creating zammad mysql user"
  mysql ${MYSQL_CREDENTIALS} -e "CREATE USER \"${DB_USER}\"@\"${DB_HOST}\" IDENTIFIED BY \"${DB_PASS}\";"

  echo "# Grant privileges to new mysql user"
  mysql ${MYSQL_CREDENTIALS} -e "GRANT ALL PRIVILEGES ON ${DB}.* TO \"${DB_USER}\"@\"${DB_HOST}\"; FLUSH PRIVILEGES;"
}

function update_database_yml () {
  if [ "${OS}" == "REDHAT" ] || [ "${OS}" == "SUSE" ]; then
    if [ "${ADAPTER}" == "postgresql" ]; then
      DB_PASS=""
    fi
  fi

  echo "# Updating database.yml"
  sed -e "s/.*adapter:.*/  adapter: ${ADAPTER}/" \
    -e "s/.*username:.*/  username: ${DB_USER}/" \
    -e "s/.*password:.*/  password: ${DB_PASS}/" \
    -e "s/.*database:.*/  database: ${DB}/" < ${ZAMMAD_DIR}/config/database.yml.pkgr > ${ZAMMAD_DIR}/config/database.yml
}

function initialise_database () {
  zammad run rake db:migrate
  zammad run rake db:seed
}

function update_database () {
  echo "# database.yml found. Updating db..."
  zammad run rake db:migrate
}

function create_webserver_config () {
  if [ "${OS}" == "DEBIAN" ]; then
    test -f /etc/${WEBSERVER}/sites-available/zammad.conf || cp ${ZAMMAD_DIR}/contrib/${WEBSERVER}/zammad.conf /etc/${WEBSERVER}/sites-available/zammad.conf
    test -h ${WEBSERVER_CONF} || ln -s /etc/${WEBSERVER}/sites-available/zammad.conf ${WEBSERVER_CONF}
    if [ "${WEBSERVER}" == "apache2" ]; then
      a2enmod proxy
      a2enmod proxy_http
      a2enmod proxy_wstunnel
    fi
  else
    test -f ${WEBSERVER_CONF} || cp ${ZAMMAD_DIR}/contrib/${WEBSERVER}/zammad.conf ${WEBSERVER_CONF}
  fi

  echo "# Creating webserver bootstart"
  ${INIT_CMD} enable ${WEBSERVER_CMD}

  echo "# Restarting webserver ${WEBSERVER_CMD}"
  ${INIT_CMD} restart ${WEBSERVER_CMD}
}

function update_or_install () {
  if [ -f ${ZAMMAD_DIR}/config/database.yml ]; then
    update_database
  else
    create_database_password

    if [ "${ADAPTER}" == "postgresql" ]; then
      echo "# Installing zammad on postgresql"
      create_postgresql_db
    elif [ "${ADAPTER}" == "mysql2" ]; then
      echo "# Installing zammad on mysql"
      create_mysql_db
    fi

    update_database_yml

    initialise_database
  fi
}

function set_env_vars () {
  zammad config:set RUBY_GC_MALLOC_LIMIT=${ZAMMAD_RUBY_GC_MALLOC_LIMIT:=1077216}
  zammad config:set RUBY_GC_MALLOC_LIMIT_MAX=${ZAMMAD_RUBY_GC_MALLOC_LIMIT_MAX:=2177216}
  zammad config:set RUBY_GC_OLDMALLOC_LIMIT=${ZAMMAD_RUBY_GC_OLDMALLOC_LIMIT:=2177216}
  zammad config:set RUBY_GC_OLDMALLOC_LIMIT_MAX=${ZAMMAD_RUBY_GC_OLDMALLOC_LIMIT_MAX:=3000100}
}

function final_message () {
  echo -e "####################################################################################"
  echo -e "\nAdd your fully qualified domain name or public IP to servername directive of"
  echo -e "${WEBSERVER}, if this installation is done on a remote server. You have to change:"
  echo -e "${WEBSERVER_CONF} and restart ${WEBSERVER_CMD} process."
  echo -e "Otherwise just open http://localhost/ in your browser to start using Zammad.\n"
  if [ "${OS}" == "REDHAT" ]; then
    echo -e "\n Remember to enable selinux and firewall rules!\n"
    echo -e "Use the following commands:"
    echo -e "	setsebool httpd_can_network_connect on -P"
    echo -e "	firewall-cmd --zone=public --add-service=http --permanent"
    echo -e "	firewall-cmd --zone=public --add-service=https --permanent"
    echo -e "	firewall-cmd --reload\n"
  elif [ "${OS}" == "SUSE" ]; then
    echo -e "\n Make sure that the firewall is not blocking port 80 & 443!\n"
    echo -e "Use 'yast firewall' or 'SuSEfirewall2' commands to configure it"
  fi
  echo -e "####################################################################################"
}