#!/bin/bash
set -e

if [ "$EUID" -ne 0 ]; then
    echo "Error: This script must be run as root" >&2
    exit 1
fi
set -x

# What user should we use for connecting to the database
POSTGRES_USER="${POSTGRES_USER:-postgres}"

# We pipe this output through cat to ensure we always get return code 0
# We have to do this because on production database zulip may not exist, so psql
# will fail with return code 2. Because set -e is on, this will cause the script
# to bail.
records=$(su "$POSTGRES_USER" -c "psql -Atc 'SELECT COUNT(*) FROM zulip.zerver_message;' zulip" | cat)

if [[ $records -gt 200 ]]
then
    set +x
    echo "WARNING: This will delete your Zulip database which currently contains $records messages."
    read -p "Do you want to proceed? " -n 1 -r
    echo
    if [[ ! $REPLY =~ ^[Yy]$ ]]
    then
        exit 1
    fi
    set -x
fi

# Shut down all services to ensure a quiescent state.
if [ -e "/var/run/supervisor.sock" ]; then
    supervisorctl stop all
fi

# Drop any open connections to any old database.  Hackishly call using
# `source`, because postgres user may not be able to read this directory
# if unpacked by root.
# shellcheck source=/dev/null
source "$(dirname "$0")/terminate-psql-sessions" postgres zulip zulip_base

(
# Make sure the current working directory is readable by postgres
cd /

su "$POSTGRES_USER" -c psql <<EOF
DROP DATABASE IF EXISTS zulip;
EOF

"$(dirname "$0")/postgres-create-db"
)

# Clear memcached to avoid contamination from previous database state
"$(dirname "$0")/flush-memcached"

echo "Database created"