#!/usr/bin/env bash
YW=$(echo "\033[33m")
RD=$(echo "\033[01;31m")
BL=$(echo "\033[36m")
GN=$(echo "\033[1;92m")
CL=$(echo "\033[m")
RETRY_NUM=10
RETRY_EVERY=3
NUM=$RETRY_NUM
CM="${GN}✓${CL}"
CROSS="${RD}✗${CL}"
BFR="\\r\\033[K"
HOLD="-"
set -o errexit
set -o errtrace
set -o nounset
set -o pipefail
shopt -s expand_aliases
alias die='EXIT=$? LINE=$LINENO error_exit'
trap die ERR

function error_exit() {
  trap - ERR
  local reason="Unknown failure occurred."
  local msg="${1:-$reason}"
  local flag="${RD}‼ ERROR ${CL}$EXIT@$LINE"
  echo -e "$flag $msg" 1>&2
  exit $EXIT
}

function msg_info() {
  local msg="$1"
  echo -ne " ${HOLD} ${YW}${msg}..."
}

function msg_ok() {
  local msg="$1"
  echo -e "${BFR} ${CM} ${GN}${msg}${CL}"
}

function msg_error() {
  local msg="$1"
  echo -e "${BFR} ${CROSS} ${RD}${msg}${CL}"
}

msg_info "Setting up Container OS "
sed -i "/$LANG/ s/\(^# \)//" /etc/locale.gen
locale-gen >/dev/null
while [ "$(hostname -I)" = "" ]; do
  echo 1>&2 -en "${CROSS}${RD} No Network! "
  sleep $RETRY_EVERY
  ((NUM--))
  if [ $NUM -eq 0 ]; then
    echo 1>&2 -e "${CROSS}${RD} No Network After $RETRY_NUM Tries${CL}"
    exit 1
  fi
done
msg_ok "Set up Container OS"
msg_ok "Network Connected: ${BL}$(hostname -I)"

set +e
alias die=''
if nc -zw1 8.8.8.8 443; then msg_ok "Internet Connected"; else
  msg_error "Internet NOT Connected"
  exit 1
fi
RESOLVEDIP=$(nslookup "github.com" | awk -F':' '/^Address: / { matched = 1 } matched { print $2}' | xargs)
if [[ -z "$RESOLVEDIP" ]]; then msg_error "DNS Lookup Failure"; else msg_ok "DNS Resolved github.com to $RESOLVEDIP"; fi
alias die='EXIT=$? LINE=$LINENO error_exit'
set -e

msg_info "Updating Container OS"
apt-get update &>/dev/null
apt-get -y upgrade &>/dev/null
msg_ok "Updated Container OS"

msg_info "Installing Dependencies"
apt-get install -y curl &>/dev/null
apt-get install -y sudo &>/dev/null
apt-get install -y gnupg2 &>/dev/null
apt-get install -y lsb-release &>/dev/null
msg_ok "Installed Dependencies"

msg_info "Setting up PostgreSQL Repository"
sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list' &>/dev/null
wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add - &>/dev/null
msg_ok "Setup PostgreSQL Repository"

msg_info "Installing PostgreSQL"
apt-get update &>/dev/null
apt-get install -y postgresql &>/dev/null

cat <<EOF >/etc/postgresql/15/main/pg_hba.conf
# PostgreSQL Client Authentication Configuration File
local   all             postgres                                peer
# TYPE  DATABASE        USER            ADDRESS                 METHOD
# "local" is for Unix domain socket connections only
local   all             all                                     peer
# IPv4 local connections:
host    all             all             127.0.0.1/32            scram-sha-256
host    all             all             0.0.0.0/24              md5
# IPv6 local connections:
host    all             all             ::1/128                 scram-sha-256
host    all             all             0.0.0.0/0               md5
# Allow replication connections from localhost, by a user with the
# replication privilege.
local   replication     all                                     peer
host    replication     all             127.0.0.1/32            scram-sha-256
host    replication     all             ::1/128                 scram-sha-256
EOF

cat <<EOF >/etc/postgresql/15/main/postgresql.conf
# -----------------------------
# PostgreSQL configuration file
# -----------------------------

#------------------------------------------------------------------------------
# FILE LOCATIONS
#------------------------------------------------------------------------------

data_directory = '/var/lib/postgresql/15/main'       
hba_file = '/etc/postgresql/15/main/pg_hba.conf'     
ident_file = '/etc/postgresql/15/main/pg_ident.conf'   
external_pid_file = '/var/run/postgresql/15-main.pid'                   

#------------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#------------------------------------------------------------------------------

# - Connection Settings -

listen_addresses = '*'                 
port = 5432                             
max_connections = 100                  
unix_socket_directories = '/var/run/postgresql' 

# - SSL -

ssl = on
ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem'
ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key'

#------------------------------------------------------------------------------
# RESOURCE USAGE (except WAL)
#------------------------------------------------------------------------------

shared_buffers = 128MB                
dynamic_shared_memory_type = posix      

#------------------------------------------------------------------------------
# WRITE-AHEAD LOG
#------------------------------------------------------------------------------

max_wal_size = 1GB
min_wal_size = 80MB

#------------------------------------------------------------------------------
# REPORTING AND LOGGING
#------------------------------------------------------------------------------

# - What to Log -

log_line_prefix = '%m [%p] %q%u@%d '           
log_timezone = 'Etc/UTC'

#------------------------------------------------------------------------------
# PROCESS TITLE
#------------------------------------------------------------------------------

cluster_name = '15/main'                

#------------------------------------------------------------------------------
# CLIENT CONNECTION DEFAULTS
#------------------------------------------------------------------------------

# - Locale and Formatting -

datestyle = 'iso, mdy'
timezone = 'Etc/UTC'
lc_messages = 'C'                      
lc_monetary = 'C'                       
lc_numeric = 'C'                        
lc_time = 'C'                           
default_text_search_config = 'pg_catalog.english'

#------------------------------------------------------------------------------
# CONFIG FILE INCLUDES
#------------------------------------------------------------------------------

include_dir = 'conf.d'                  
EOF

sudo systemctl restart postgresql
msg_ok "Installed PostgreSQL"

read -r -p "Would you like to add Adminer? <y/N> " prompt
if [[ $prompt == "y" || $prompt == "Y" || $prompt == "yes" || $prompt == "Yes" ]]; then
  ADMINER="Y"
else
  ADMINER="N"
fi

if [[ $ADMINER == "Y" ]]; then
  msg_info "Installing Adminer"
  sudo apt install adminer -y &>/dev/null
  sudo a2enconf adminer &>/dev/null
  sudo systemctl reload apache2 &>/dev/null
  msg_ok "Installed Adminer"
fi

PASS=$(grep -w "root" /etc/shadow | cut -b6)
if [[ $PASS != $ ]]; then
  msg_info "Customizing Container"
  chmod -x /etc/update-motd.d/*
  touch ~/.hushlogin
  GETTY_OVERRIDE="/etc/systemd/system/container-getty@1.service.d/override.conf"
  mkdir -p $(dirname $GETTY_OVERRIDE)
  cat <<EOF >$GETTY_OVERRIDE
[Service]
ExecStart=
ExecStart=-/sbin/agetty --autologin root --noclear --keep-baud tty%I 115200,38400,9600 \$TERM
EOF
  systemctl daemon-reload
  systemctl restart $(basename $(dirname $GETTY_OVERRIDE) | sed 's/\.d//')
  msg_ok "Customized Container"
fi

msg_info "Cleaning up"
apt-get autoremove >/dev/null
apt-get autoclean >/dev/null
msg_ok "Cleaned"
