#!/bin/bash

function check() {
    PREFIX="recipe:postgresql:check"
    container_running "$CONTAINER" || return 10
    echo "checking postgresql regarding access to the bridge subnet <$BRIDGE_SUBNET>..."

    lxc exec "$CONTAINER" -- bash <<EOF
        set -Eeuo pipefail
        systemctl is-active postgresql.service &>/dev/null
        ss -tlnp | grep postgres | grep -q 0.0.0.0:5432
        PG_VERSION=\$(pg_lsclusters -h | cut -d' ' -f1)
        grep -Eq "^host.*all.*all.*$BRIDGE_SUBNET.*md5" /etc/postgresql/\$PG_VERSION/main/pg_hba.conf
        test -f /etc/default/autopostgresqlbackup
EOF
    status="$?"
    [[ $status -eq 0 ]] && echo "container <$CONTAINER> approved!"
    return $status
}

function install() {
    PREFIX="recipe:postgresql:install"
    : "$PREFIX"

    echowarn "initializing postgresql regarding access to the bridge subnet <$BRIDGE_SUBNET>..."

    launch_container "$CONTAINER"
    lxc exec "$CONTAINER" -- bash <<EOF
        set -Eeuo pipefail

        apt update
        . /opt/miaou-bash/lib/functions.sh
        /opt/miaou-bash/tools/idem_apt_install postgresql

        echo -n "start postgresql now..."
        PG_VERSION=\$(pg_lsclusters -h | cut -d' ' -f1)
        pg_ctlcluster \$PG_VERSION main start
        echo "OK"

        function systemctl-exists() ([ \$(systemctl list-unit-files "\${1}*" | wc -l) -gt 3 ])
        systemctl-exists exim4.service && systemctl disable exim4.service

        /opt/miaou-bash/tools/append_or_replace "^listen_addresses = .*$" "listen_addresses = '0.0.0.0'" /etc/postgresql/\$PG_VERSION/main/postgresql.conf
        /opt/miaou-bash/tools/append_or_replace "^host.*all.*all.*$BRIDGE_SUBNET.*md5" "host\tall\t\tall\t\t$BRIDGE_SUBNET\t\tmd5" /etc/postgresql/\$PG_VERSION/main/pg_hba.conf
        systemctl restart postgresql.service
EOF

    echo -n "copying <autopostgresqlbackup> files over container <$CONTAINER> ... "
    lxc file push --uid 0 --gid 0 "$MIAOU_BASEDIR/templates/autopostgresqlbackup/script" "$CONTAINER/usr/sbin/autopostgresqlbackup"
    lxc file push --uid 0 --gid 0 "$MIAOU_BASEDIR/templates/autopostgresqlbackup/cron.daily" "$CONTAINER/etc/cron.daily/autopostgresqlbackup"
    lxc file push --uid 0 --gid 0 "$MIAOU_BASEDIR/templates/autopostgresqlbackup/default.conf" "$CONTAINER/etc/default/autopostgresqlbackup"
    PREFIX="" echo OK

}

# MAIN
. "$MIAOU_BASEDIR/lib/init.sh"

arg1_required "$@"

CONTAINER="$1"
BRIDGE_SUBNET=$(lxc network get lxdbr0 ipv4.address)
readonly CONTAINER BRIDGE_SUBNET

check || (
    install
    check
)