#!/bin/bash

#
## Installation and maintenance for LibreNMS

readonly toolName="librenms"
readonly toolUser="librenms"

libreDeps='acl curl fping git graphviz imagemagick mtr-tiny nmap python3-dotenv python3-pymysql python3-redis python3-setuptools python3-systemd python3-pip rrdtool snmp snmpd whois'
librePhpDeps=(cli curl fpm gd gmp mbstring mysql snmp xml zip)

sq_aptOpt=
phpVersion=

seq_config() {
  #initSeqConfig "$CONFIG_FILE_NAME" "$CONFIG_FILE_TEMPLATE"
  if initSeqConfig "${seq_configName:?}" "${seq_configTemplate:?}" ; then
    info "     Install: $LNMS_DIR"
    info "      Backup: $LNMS_BU_DIR"
  else
    dry || return 1
  fi

  return 0
}

step_1_info() { echo "Updating apt"; }
step_1_alias() { echo "install"; }
step_1() {
  exe apt update
}

step_2_info() {
  echo "Installing $toolName dependencies:"
  echoinfo "$libreDeps"
}
step_2() {
  exe apt install $libreDeps ${sq_aptOpt}
  endReturn "Failed to install $toolName dependencies"
}

step_3_info() {
  echo "Installing PHP related packages:"
  fetchPhpVersion
  echoinfo "${librePhpDeps[@]/#/php${phpVersion}-}"
}
step_3() {
  fetchPhpVersion
  exe apt install "${librePhpDeps[@]/#/php${phpVersion}-}" ${sq_aptOpt}
  endReturn "Failed to install $toolName php dependencies"
}

step_4_info() { echo "Adding $toolName user ($toolUser)"; }
step_4() {
  exe useradd $toolUser -d "$LNMS_DIR" -M -r -s "$(which bash)"
  saveReturn $?
  endReturn "Failed to create user $toolUser"
}

step_5_info() { echo "Clone $toolName git repository"; }
step_5() {
  exe git clone https://github.com/librenms/librenms.git "$LNMS_DIR"
  # set permissions
  step fix
}

step_6_info() { echo "Installing $toolName using composer"; }
step_6() {
  exe sudo -u librenms "${LNMS_DIR}/scripts/composer_wrapper.php" install --no-dev
  endReturn "Failed to install php dependencies"
}

step_10_info() { echo "Create mysql database for $toolName"; }
step_10() {
  local libreDbOpt=
  if [ -n "$LNMS_DB_NAME" ] ; then
    libreDbOpt="-d $LNMS_DB_NAME"
  fi
  exe "${seq_origin}"/mysql.sh ${sqr_args} createdb --charset utf8 "$libreDbOpt"
  endReturn "Failed to create mysql database $LNMS_DB_NAME"
}

step_11_info() { echo "MariaDB configuration"; }
step_11() {
  color green
  cat << SQLCONF_END

Edit or create /etc/mysql/mariadb.conf.d/90-myconfig.cnf and add:

------------------------
[mysqld]
innodb_file_per_table=1
lower_case_table_names=0
------------------------

Restart mysql afterwards:
service mysql restart
SQLCONF_END
}

step_12_info() { echo "PHP fpm/cli timezone configuration"; }
step_12() {
  color green
  fetchPhpVersion
  cat << PHPCONF_END

Ensure date.timezone is set in php.ini to your preferred time zone. See http://php.net/manual/en/timezones.php for a list of supported timezones. Valid examples are: "America/New_York", "Europe/Berlin", "Etc/UTC".

vi /etc/php/${phpVersion}/fpm/conf.d/90-custom_pi.ini
vi /etc/php/${phpVersion}/cli/conf.d/90-custom_pi.ini

-------------------------------------------
date.timezone = Europe/Berlin
-------------------------------------------

Restart php-fpm afterwards:
service php7.3-fpm restart
PHPCONF_END
}

step_13_info() { echo "PHP fpm configuration"; }
step_13() {
  color green
  cat << FPMCONF_END

cp /etc/php/${phpVersion}/fpm/pool.d/www.conf /etc/php/${phpVersion}/fpm/pool.d/librenms.conf
vi /etc/php/${phpVersion}/fpm/pool.d/librenms.conf

# Change [www] to [librenms]:

[librenms]

# Change user and group to "librenms":

user = librenms
group = librenms

# Change listen to a unique name:

listen = /run/php-fpm-librenms.sock
FPMCONF_END
}

step_14_info() { echo "Nginx configuration"; }
step_14() {
  color green
  cat << NGINXCONF_END

server {
 listen      80;
 server_name librenms.example.com;
 root        $LNMS_DIR/html;
 index       index.php;

 charset utf-8;
 gzip on;
 gzip_types text/css application/javascript text/javascript application/x-javascript image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon;
 location / {
  try_files \$uri \$uri/ /index.php?\$query_string;
 }
 location ~ [^/]\\.php(/|$) {
  fastcgi_pass unix:/run/php-fpm-librenms.sock;
  fastcgi_split_path_info ^(.+\\.php)(/.+)$;
  include fastcgi.conf;
 }
 location ~ /\\.(?!well-known).* {
  deny all;
 }
}
NGINXCONF_END
}

step_20_info() { echo "Create $toolName cron job"; }
step_20_alias() { echo "cron"; }
step_20() {
  local lnmsCronLoc="/etc/cron.d/librenms"
  info -n "Creating $lnmsCronLoc ... "
  exe cp "${LNMS_DIR}/librenms.nonroot.cron" "$lnmsCronLoc" && info -d "Ok" || info -d "Nok"
}

step_22_info() { echo "Enable lnms command completion"; }
step_22_alias() { echo "cmdcompletion"; }
step_22() {
  local lnmsLocalBin="/usr/local/bin/lnms"
  exep echo -e '"#!/usr/bin/env bash\nsudo -u '$toolUser' \"'$LNMS_DIR'/lnms\" \"\$@\""' \> "$lnmsLocalBin"
  exe chmod 744 "$lnmsLocalBin"
  exe cp "${LNMS_DIR}/misc/lnms-completion.bash" /etc/bash_completion.d/
}

step_24_info() { echo "Copy logrotate config"; }
step_24_alias() { echo "logrotate"; }
step_24() {
  local lnmsLogrotLoc="/etc/logrotate.d/librenms"
  info -n "Creating $lnmsLogrotLoc ... "
  exe cp "${LNMS_DIR}/misc/librenms.logrotate" "$lnmsLogrotLoc" && info -d "Ok" || info -d "Nok"
}

step_26_info() { echo "Install nagios plugin to enable services"; }
step_26_alias() { echo "services"; }
step_26() {
  exe apt install monitoring-plugins
  info
  info " [$LNMS_DIR/config.php]"
  info -a "  \$config['show_services']           = 1;"
  info -a
  info -a " [/etc/cron.d/librenms]"
  info -a "  */5 * * * * librenms /opt/librenms/services-wrapper.py 1"
}

step_30_info() { echo "Backup ${toolName} web direcotry"; }
step_30_alias() { echo "backup"; }
step_30() {
  info "Backup install directory to ${LNMS_BU_DIR}"
  exe mkdir -p "$LNMS_BU_DIR"
  exep cd "${LNMS_DIR}"/.. "&&" tar czf "${LNMS_BU_DIR}/$(date +%Y%m%d)_${toolName}_web.tar.gz" "$(basename "$LNMS_DIR")"
}

step_31_info() { echo "Backup ${toolName} database"; }
step_31_options() { echo "[daily|monthly(default)]"; }
step_31_alias() { echo "backupdb"; }
step_31() {
  case "${2:-}" in
    daily | Daily | DAILY)
      info "Daily backup..."
      exep mysqldump --single-transaction -u root "${LNMS_DB_NAME}" \| bzip2 -c \> "${LNMS_BU_DIR}/${toolName}_daily.sql.bz2"
      ;;
    *)
      exe mkdir -p "$LNMS_BU_DIR/monthly"
      info "Monthly backup..."
      exep mysqldump --single-transaction -u root "${LNMS_DB_NAME}" \| bzip2 -c \> "${LNMS_BU_DIR}/monthly/$(date +%Y%m%d)_${toolName}.sql.bz2"
      ;;
  esac
}

step_40_info() { echo "Switch $toolName installation to monthly stable"; }
step_40() {
  cat << STABLE_EOF

Add following to ${LNMS_DIR}/config.php

--------------------------------------
\$config['update_channel'] = 'release';
--------------------------------------

Execute following command afterwards:
cd $LNMS_DIR && git fetch --tags && git checkout \$(git describe --tags \$(git rev-list --tags --max-count=1))
STABLE_EOF
}

step_42_info() { echo "Fix librenms permission"; }
step_42_alias() { echo "fix"; }
step_42() {
  exe chown -R ${toolUser}: "$LNMS_DIR"
  exe chmod 771 "${LNMS_DIR}"
  exe setfacl -d -m g::rwx "${LNMS_DIR}/rrd" "${LNMS_DIR}/logs" "${LNMS_DIR}/bootstrap/cache/" "${LNMS_DIR}/storage/"
  exe setfacl -R -m g::rwx "${LNMS_DIR}/rrd" "${LNMS_DIR}/logs" "${LNMS_DIR}/bootstrap/cache/" "${LNMS_DIR}/storage/"
}

fetchPhpVersion() {
  if [ -n "${phpVersion}" ] ; then
    return 0
  fi

  phpVersion="$(php -r 'echo PHP_MAJOR_VERSION.".".PHP_MINOR_VERSION;')"
}

# shellcheck disable=SC2034 # Appears unused
readonly sqr_minVersion=16
# shellcheck disable=SC1091 # Don't follow this source
. /usr/local/bin/sequencer.sh