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/*
 * Copyright (c) 2020 Richard Hauswald - https://quantummaid.de/.
 *
 * 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 de.quantummaid.httpmaid.websockets.registry;

import de.quantummaid.httpmaid.MetricsProvider;
import de.quantummaid.httpmaid.websockets.WebSocket;
import lombok.AccessLevel;
import lombok.EqualsAndHashCode;
import lombok.RequiredArgsConstructor;

import java.util.Set;

import static de.quantummaid.httpmaid.util.Validators.validateNotNull;
import static de.quantummaid.httpmaid.websockets.registry.SaveMap.saveMap;
import static de.quantummaid.httpmaid.websockets.registry.WebSocketNotFoundException.webSocketNotFoundException;

@EqualsAndHashCode
@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
public final class WebSocketRegistry {
    private final SaveMap preActiveWebSockets;
    private final SaveMap activeWebSockets;
    private final MetricsProvider metricsProvider;

    public static WebSocketRegistry webSocketRegistry(final MetricsProvider metricsProvider) {
        validateNotNull(metricsProvider, "metricsProvider");
        return new WebSocketRegistry(saveMap(), saveMap(), metricsProvider);
    }

    public synchronized WebSocket byId(final WebSocketId id) {
        return activeWebSockets.get(id).orElseThrow(() -> webSocketNotFoundException(id));
    }

    public synchronized void register(final WebSocketId id,
                                      final WebSocket webSocket) {
        preActiveWebSockets.put(id, webSocket);
        updateMetrics();
    }

    public synchronized void activate(final WebSocketId id) {
        final WebSocket webSocket = preActiveWebSockets.getAndRemove(id).orElseThrow(() -> webSocketNotFoundException(id));
        activeWebSockets.put(id, webSocket);
    }

    public synchronized void unregister(final WebSocketId id) {
        activeWebSockets.getAndRemove(id).orElseThrow(() -> webSocketNotFoundException(id));
        updateMetrics();
    }

    public synchronized Set allActiveWebSockets() {
        return activeWebSockets.copyOfValues();
    }

    private void updateMetrics() {
        metricsProvider.provideMetric(activeWebSockets.size() + preActiveWebSockets.size());
    }

    @Override
    public String toString() {
        return "WebSocketRegistry";
    }
}