#!/bin/bash
# This file is part of GNU ANASTASIS.
# Copyright (C) 2023 Anastasis Systems SA
#
# ANASTASIS 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.
#
# ANASTASIS 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
# ANASTASIS; 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="anastasis-httpd"
CFGFILE="/etc/anastasis/secrets/anastasis-db.secret.conf"

# Parse command-line options
while getopts 'c:hrsu:' OPTION; do
    case "$OPTION" in
        c)
            CFGFILE="$OPTARG"
            ;;
        h)
            echo 'Supported options:'
            echo "  -c FILENAME  -- write configuration to FILENAME (default: $CFGFILE)"
            echo "  -r           -- reset database (dangerous)"
            echo "  -s           -- skip database initialization"
            echo "  -u USER      -- anastasis-httpd 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 = "$SKIP_DBINIT" ]
then
    if ! anastasis-dbinit -v 2> /dev/null
    then
        echo "Required 'anastasis-dbinit' not found. Please fix your installation."
	exit 1
    fi
    DBINIT=$(which anastasis-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=$(anastasis-config \
             -c "$CFGFILE" \
             -s stasis-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