#!/usr/bin/env bash

set -eu
script_name=$0

die() {
    echo >&2 "$@"
    exit 1
}

POSTGRES_HOST=${POSTGRES_HOST:-127.0.0.1}
POSTGRES_PORT=${POSTGRES_PORT:-5432}
POSTGRES_PASSWORD=${POSTGRES_PASSWORD:-postgres}
POSTGRES_USER=${POSTGRES_USER:-postgres}

about() {
    die "usage: $script_name [ config_yaml | setup | dump <backup_file> | restore <backup_file> ]"
}

check_postgres_client() {
    if ! command -v psql --version >/dev/null; then
        die "missing required program 'psql' as a postgres client (package postgres-client-13 on debian like system)"
    fi
}

exec_sql() {
    cmd="${1?Missing required sql command}"
    PGPASSWORD="${POSTGRES_PASSWORD}" psql --host "${POSTGRES_HOST}" --user "${POSTGRES_USER}" "--port=${POSTGRES_PORT}" <<< "$cmd"
}

requirements() {
    check_mysql_client
}

setup() {
    exec_sql "DROP DATABASE IF EXISTS crowdsec_test;"
    exec_sql "CREATE DATABASE crowdsec_test;"
    exec_sql "DROP USER IF EXISTS crowdsec_test;"
    exec_sql "CREATE USER crowdsec_test WITH ENCRYPTED PASSWORD 'crowdsec_test';"
    exec_sql "GRANT ALL PRIVILEGES ON DATABASE crowdsec_test TO crowdsec_test;"
    # exec_sql "SET log_statement='all';"
    # exec_sql "SELECT pg_reload_conf();"
}

dump() {
    backup_file="${1?Missing file to backup database to}"
    PGPASSWORD="${POSTGRES_PASSWORD}" pg_dump -Ft --host "${POSTGRES_HOST}" --port "${POSTGRES_PORT}"  --username "${POSTGRES_USER}" --dbname crowdsec_test > "$backup_file"
}

restore() {
    backup_file="${1?missing file to restore database from}"
    [ -f "$backup_file" ] || die "Backup file $backup_file doesn't exist"
    PGPASSWORD="${POSTGRES_PASSWORD}" pg_restore --username "${POSTGRES_USER}" --host "${POSTGRES_HOST}" --port "${POSTGRES_PORT}" --dbname crowdsec_test --clean < "$backup_file"
}

config_yaml() {
    POSTGRES_PORT=${POSTGRES_PORT} POSTGRES_HOST=${POSTGRES_HOST} yq '
        .db_config.type="postgres"|
        .db_config.user="crowdsec_test" |
        .db_config.password="crowdsec_test" |
        .db_config.db_name="crowdsec_test"  |
        .db_config.host=strenv(POSTGRES_HOST) |
        .db_config.port=env(POSTGRES_PORT) |
        .db_config.sslmode="disable" |
        del(.db_config.db_path)
    ' -i "${CONFIG_YAML}"
}

[ $# -lt 1 ] && about

case "$1" in
    setup)
        setup
        ;;
    config-yaml)
        config_yaml
        ;;
    dump)
        shift
        dump "$@"
        ;;
    restore)
        shift
        restore "$@"
        ;;
    *)
        about
        ;;
esac;