#!/bin/bash

# Exit on command errors and treat unset variables as an error
set -eu

shopt -s extglob  # sets extended pattern matching options in the bash shell

app=$YNH_APP_INSTANCE_NAME

# Source local helpers
source ./_common.sh

# Retrieve arguments
domain=$YNH_APP_ARG_DOMAIN
path=$YNH_APP_ARG_PATH
admin=$YNH_APP_ARG_ADMIN
is_public=$YNH_APP_ARG_IS_PUBLIC

# Source YunoHost helpers
source /usr/share/yunohost/helpers

# Fix path if needed
path=$(fix_path $path)

# Check domain/path availability
sudo yunohost app checkurl "${domain}${path}" -a "$app" \
    || ynh_die "Path not available: ${domain}${path}"

# Save app settings
ynh_app_setting_set "$app" admin "$admin"
ynh_app_setting_set "$app" is_public "$is_public"

# Install dependencies
install_dependencies

# If NetData is installed, configure it to feed InfluxDB
netdata_conf="/opt/netdata/etc/netdata/netdata.conf"
if [[ -f "$netdata_conf" ]] ; then
  # If there is already a [backend] section
  if [ -n "$(sudo cat $netdata_conf | grep '\[backend\]')" ] ; then
    # These regexps replaces patterns inside ini [sections] ([backend] section, here)
    sudo sed -i '/^\[backend\]$/,/^\[/ {
      s/# enabled = no/enabled = yes/
      s/# type = graphite/type = opentsdb/
      s/# destination = localhost/destination = localhost:4242/
      s/# update every = 10/update every = 60/      
    }' $netdata_conf
  else
    # Otherwise create the section
    echo "[backend]
enabled = yes
type = opentsdb
destination = localhost:4242" | sudo tee -a $netdata_conf
  fi
  
  # Restart NetData
  sudo systemctl restart netdata
fi

# Generate MySQL password and create database
dbuser=$app
dbname=$app
dbpass=$(ynh_string_random 12)
ynh_app_setting_set "$app" mysqlpwd "$dbpass"
ynh_mysql_create_db "$dbname" "$dbuser" "$dbpass"

# Configure InfluxDB
if [ -f /etc/influxdb/influxdb.conf ] ; then
  sudo sed -i '/^\[\[opentsdb\]\]$/,/^\[/ s/# enabled = false/enabled = true/' /etc/influxdb/influxdb.conf
else
  [ -d /etc/influxdb ] || sudo mkdir /etc/influxdb
  sudo cp ../conf/influxdb.conf /etc/influxdb
fi

# Start InfluxDB server
sudo systemctl start influxdb

# Configure Grafana
sudo cp ../conf/ldap.toml /etc/grafana

grafana_conf="/etc/grafana/grafana.ini"
# Set final URL
sudo sed -i "/^\[server\]$/,/^\[/ s@;root_url = .*@root_url = https://$domain$path@" $grafana_conf
# Disable check for updates
sudo sed -i '/^\[analytics\]$/,/^\[/ s/;check_for_updates = .*/check_for_updates = false/' $grafana_conf
# Disable organization creation
sudo sed -i '/^\[users\]$/,/^\[/ s/;allow_org_create = .*/allow_org_create = false/' $grafana_conf
# Enable HTTP and LDAP authentication
sudo sed -i '/^\[auth.basic\]$/,/^\[/ s/;enabled = .*/enabled = false/' $grafana_conf
sudo sed -i '/^\[auth.proxy\]$/,/^\[/ s/;enabled = .*/enabled = true/' $grafana_conf
sudo sed -i '/^\[auth.ldap\]$/,/^\[/ {
  s/;enabled = .*/enabled = true/
  s/;allow_sign_up = .*/allow_sign_up = true/
}' $grafana_conf
# Set log level to debug
sudo sed -i '/^\[log\]$/,/^\[/ s/;level = .*/level = debug/' $grafana_conf

# Change URL and database credentials
sudo sed -i "/^\[database\]$/,/^\[/ {
  s/;type = .*/type = mysql/
  s/;name = .*/name = $dbname/
  s/;user = .*/user = $dbuser/
  s/;password =.*/password = $dbpass/
}" $grafana_conf

# Restart grafana server
sudo systemctl restart grafana-server

# Wait for Grafana to start and initialize database
while [ -z "$(sudo netstat -lnput|grep grafana)" ] ; do
  sleep 5s
done

# Change admin name to the specified one
mail=$(ynh_user_get_info "$admin" 'mail')
ynh_mysql_connect_as $dbuser $dbpass $dbname <<< "UPDATE user SET login=\"$admin\", email=\"$mail\" WHERE login=\"admin\";"

# Import default dashboard for NetData
hostname=$(hostname)
sed -i "s@yunohost.yunohost.org@$hostname@g" ../conf/grafana_init_data.sql
ynh_mysql_connect_as $dbuser $dbpass $dbname < ../conf/grafana_init_data.sql

# Restart grafana server to take db change into account
sudo systemctl restart grafana-server

# Enable the systemd service so that InfluxDB and Grafana start at boot
sudo systemctl enable influxdb.service
sudo systemctl enable grafana-server.service

# Store useful files for backup/restore scripts
sudo cp _common.sh /etc/grafana

# Modify Nginx configuration file and copy it to Nginx conf directory
if [[ "$path" == "/" ]] ; then
  nginx_conf=../conf/nginx_root.conf
else
  nginx_conf=../conf/nginx_sub_dir.conf
fi

sed -i "s@YNH_WWW_PATH@$path@g" $nginx_conf
sudo cp $nginx_conf /etc/nginx/conf.d/$domain.d/$app.conf

# If app is public, add url to SSOWat conf as skipped_uris
if [[ $is_public -eq 1 ]]; then
  # unprotected_uris allows SSO credentials to be passed anyway.
  ynh_app_setting_set "$app" unprotected_uris "/"
fi

# Reload services
sudo systemctl reload nginx