#! /usr/bin/env bash

usage() {
  echo "$0 <db-uri> <test-database>"
  exit -1
}

if [ -z "$1" ]; then
  echo "Please supply the connection uri for the user with create database privileges"
  usage
fi

if [ -z "$2" ]; then
  echo "Please supply the test database name"
  usage
fi

if [[ $1 != postgres://* ]]; then
  echo "Please use a valid connection URI (https://www.postgresql.org/docs/current/static/libpq-connect.html#AEN45347)"
  usage
fi

BASEPATH=$( cd $(dirname $0) ; pwd -P )
URI="$1"
#Extract host and port--we need this to form the new connection string
HOST_PORT=$(echo $URI | cut -d'/' -f3 | cut -d'@' -f2 )
DB=$2
# Specify the username of choice, or let the script create a random unique user by appending the database name
TEST_USER_NAME=postgrest_test_authenticator
# New password will get assigned only if the user does not already exist
# Otherwise make sure to provide the correct password for the existing user
TEST_USER_PASS=$(cat /dev/urandom | env LC_CTYPE=C tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)

PGOPTIONS='-c client_min_messages=WARNING' psql "$URI" -Xq >/dev/null -c 'select rolcreatedb from pg_authid where rolname = current_user;' 2>/dev/null
if [ $? -ne 0 ]; then
  echo "ERROR: Please specify the user with 'Create DB' permissions, and ensure that the default database for the username exists."
  exit 1
fi

# plpgsql does not like psql variables, easier to pull this part off with bash variables
PGOPTIONS='-c client_min_messages=WARNING' psql "$URI" -Xq >/dev/null <<EOF
SELECT pg_terminate_backend(pg_stat_activity.pid)
FROM pg_stat_activity
WHERE pg_stat_activity.datname = '$DB'
  AND pid <> pg_backend_pid();

DROP DATABASE IF EXISTS $DB;
DROP ROLE IF EXISTS $TEST_USER_NAME;
CREATE USER $TEST_USER_NAME WITH SUPERUSER LOGIN NOINHERIT PASSWORD '$TEST_USER_PASS' CREATEROLE;
ALTER ROLE postgrest_test_authenticator SET default_text_search_config TO english;
CREATE DATABASE $DB OWNER $TEST_USER_NAME LC_COLLATE 'POSIX' LC_CTYPE 'POSIX' TEMPLATE template0;
\\connect $DB
ALTER SCHEMA public OWNER TO $TEST_USER_NAME;
ALTER DATABASE $DB SET LC_MESSAGES = 'POSIX';
ALTER DATABASE $DB SET LC_MONETARY = 'POSIX';
ALTER DATABASE $DB SET LC_NUMERIC = 'POSIX';
ALTER DATABASE $DB SET LC_TIME = 'POSIX';
EOF

#Remove database path from the connection uri--prevents setting up the new database name with PGDATABASE
URI=$(echo $URI | cut -d'/' -f1-3)

PGDATABASE=$DB PGOPTIONS='-c client_min_messages=WARNING' psql "$URI" --set=db=$DB -Xq <<EOF
  CREATE EXTENSION IF NOT EXISTS pgcrypto;
  ALTER DATABASE ${DB} SET request.jwt.claim.id = '-1';
EOF

# Create a new connection string to use with the test runner
echo 'postgres://'${TEST_USER_NAME}':'$TEST_USER_PASS'@'$HOST_PORT'/'$DB