/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.tinkerpop.example.cmdb.service;

import jakarta.inject.Singleton;
import org.apache.tinkerpop.example.cmdb.errors.ApiException;
import org.apache.tinkerpop.example.cmdb.graph.GremlinGateway;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__;

import java.util.Map;

@Singleton
public class AlertService {

    private final GremlinGateway gateway;

    public AlertService(GremlinGateway gateway) {
        this.gateway = gateway;
    }

    public void upsertAlert(Map<String, Object> body) {
        String alertId = getString(body, "alertId");
        if (alertId == null || alertId.isBlank()) {
            throw new ApiException(400, "alertId is required");
        }
        String source = getString(body, "source");
        String metric = getString(body, "metric");
        Object firedAt = body.get("firedAt");

        gateway.iterate(g -> g.V().has("alert", "alertId", alertId).fold()
                .coalesce(__.unfold(), __.addV("alert").property("alertId", alertId))
                .property("source", source)
                .property("metric", metric)
                .property("firedAt", firedAt));
    }

    private static String getString(Map<String, Object> m, String k) {
        Object v = m.get(k);
        return v == null ? null : String.valueOf(v);
    }
}
