#!/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"
DBNAME="auditor"
CFGFILE="/etc/taler/secrets/auditor-db.secret.conf"

# Parse command-line options
while getopts ':hn:rsu:' OPTION; do
    case "$OPTION" in
        h)
            echo 'Supported options:'
            echo "  -c FILENAME  -- write configuration to FILENAME (default: $CFGFILE)"
            echo "  -n NAME      -- user NAME for database name (default: $DBNAME)"
            echo "  -r           -- reset database (dangerous)"
            echo "  -s           -- skip database initialization"
            echo "  -u USER      -- taler-auditor to be run by USER (default: $DBUSER)"
            exit 0
            ;;
        n)
            DBNAME="$OPTARG"
            ;;
        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
fi

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

if sudo -i -u postgres psql "$DBNAME" < /dev/null 2> /dev/null
then
    if [ 1 = "$RESET_DB" ]
    then
        echo "Deleting existing database '$DBNAME'." 1>&2
        sudo -i -u postgres dropdb "$DBNAME"
    else
        echo "Database '$DBNAME' already exists, refusing to setup again."
        echo "Use -r to delete the existing database first (dangerous!)."
        exit 77
    fi
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

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

if [ -f "$CFGFILE" ]
then
    echo "Adding database configuration to '$CFGFILE'." 1>&2
    echo -e "[auditordb-postgres]\nCONFIG=postgres:///$DBNAME\n" >> "$CFGFILE"
else
    echo "Configuration '$CFGFILE' does not yet exist, creating it." 1>&2
    mkdir -p "$(dirname "$CFGFILE")"
    echo -e "[auditordb-postgres]\nCONFIG=postgres:///$DBNAME\n" >> "$CFGFILE"
    chown "$DBUSER":root "$CFGFILE"
    chmod 460 "$CFGFILE"
fi

if [ 0 = "$SKIP_DBINIT" ]
then
    echo "Initializing database '$DBNAME'." 1>&2
    sudo -u "$DBUSER" taler-auditor-dbinit
fi

echo "Database configuration finished." 1>&2

exit 0