#!/bin/bash
# This file is part of GNU TALER.
# Copyright (C) 2023 Taler Systems SA
#
# TALER is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free Software
# Foundation; either version 2.1, or (at your option) any later version.
#
# TALER is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License along with
# TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
#
# @author Christian Grothoff
#
#
# Error checking on
set -eu

RESET_DB=0
SKIP_DBINIT=0
DBUSER="taler-auditor-httpd"
CFGFILE="/etc/taler/taler.conf"

# Parse command-line options
while getopts ':hrsu:' OPTION; do
  case "$OPTION" in
  h)
    echo 'Supported options:'
    echo "  -c FILENAME  -- use configuration FILENAME (default: $CFGFILE)"
    echo "  -r           -- reset database (dangerous)"
    echo "  -s           -- skip database initialization"
    echo "  -u USER      -- taler-auditor to be run by USER (default: $DBUSER)"
    exit 0
    ;;
  r)
    RESET_DB="1"
    ;;
  s)
    SKIP_DBINIT="1"
    ;;
  u)
    DBUSER="$OPTARG"
    ;;
  ?)
    exit_fail "Unrecognized command line option"
    ;;
  esac
done

if ! id postgres >/dev/null; then
  echo "Could not find 'postgres' user. Please install Postgresql first"
  exit 1
fi

if [ "$(id -u)" -ne 0 ]; then
  echo "This script must be run as root"
  exit 1
fi

if [ 0 = "$SKIP_DBINIT" ]; then
  if ! taler-auditor-dbinit -v 2>/dev/null; then
    echo "Required 'taler-auditor-dbinit' not found. Please fix your installation."
  fi
  DBINIT=$(which taler-auditor-dbinit)
fi

if ! id "$DBUSER" >/dev/null; then
  echo "Could not find '$DBUSER' user. Please set it up first"
  exit 1
fi

echo "Setting up database user '$DBUSER'." 1>&2

if ! sudo -i -u postgres createuser "$DBUSER" 2>/dev/null; then
  echo "Database user '$DBUSER' already existed. Continuing anyway." 1>&2
fi

DBPATH=$(taler-config \
  -c "$CFGFILE" \
  -s auditordb-postgres \
  -o CONFIG)

if ! echo "$DBPATH" | grep "postgres://" >/dev/null; then
  echo "Invalid database configuration value '$DBPATH'." 1>&2
  exit 1
fi

DBNAME=$(echo "$DBPATH" |
  sed \
    -e "s/postgres:\/\/.*\///" \
    -e "s/?.*//")

if sudo -i -u postgres psql "$DBNAME" </dev/null 2>/dev/null; then
  if [ 1 = "$RESET_DB" ]; then
    echo "Deleting existing database '$DBNAME'." 1>&2
    if ! sudo -i -u postgres dropdb "$DBNAME"; then
      echo "Failed to delete existing database '$DBNAME'"
      exit 1
    fi
    DO_CREATE=1
  else
    echo "Database '$DBNAME' already exists, continuing anyway."
    DO_CREATE=0
  fi
else
  DO_CREATE=1
fi

if [ 1 = "$DO_CREATE" ]; then
  echo "Creating database '$DBNAME'." 1>&2

  if ! sudo -i -u postgres createdb -O "$DBUSER" "$DBNAME"; then
    echo "Failed to create database '$DBNAME'"
    exit 1
  fi
fi

if [ 0 = "$SKIP_DBINIT" ]; then
  echo "Initializing database '$DBNAME'." 1>&2
  if ! sudo -u "$DBUSER" "$DBINIT" -c "$CFGFILE"; then
    echo "Failed to initialize database schema"
    exit 1
  fi
fi

echo "Database configuration finished." 1>&2

exit 0