/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags.
 *
 * Licensed 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.keycloak.quickstart.event.storage;

import org.keycloak.events.Event;
import org.keycloak.events.EventQuery;
import org.keycloak.events.EventStoreProvider;
import org.keycloak.events.EventType;
import org.keycloak.events.admin.AdminEvent;
import org.keycloak.events.admin.AdminEventQuery;
import org.keycloak.events.admin.OperationType;
import org.keycloak.models.KeycloakSession;
import org.keycloak.models.RealmModel;

import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

/**
 * @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
 */
public class MemEventStoreProvider implements EventStoreProvider {
    private final List<Event> events;
    private final Set<EventType> excludedEvents;
    private final List<AdminEvent> adminEvents;
    private final Set<OperationType> excludedOperations;
    private final KeycloakSession session;

    public MemEventStoreProvider(List<Event> events, Set<EventType> excludedEvents, 
            List<AdminEvent> adminEvents, Set<OperationType> excludedOperations, KeycloakSession session) {
        this.events = events;
        this.excludedEvents = excludedEvents;
        
        this.adminEvents = adminEvents;
        this.excludedOperations = excludedOperations;

        this.session = session;
    }

    @Override
    public EventQuery createQuery() {
        return new MemEventQuery(new LinkedList<>(events));
    }

    @Override
    public void clear() {

    }

    @Override
    public void clear(RealmModel realm) {
        synchronized(events) {
            Iterator<Event> itr = events.iterator();
            while (itr.hasNext()) {
                if (itr.next().getRealmId().equals(realm.getId())) {
                    itr.remove();
                }
            }
        }
    }

    @Override
    public void clear(RealmModel realm, long olderThan) {
        synchronized(events) {
            Iterator<Event> itr = events.iterator();
            while (itr.hasNext()) {
                Event e = itr.next();
                if (e.getRealmId().equals(realm.getId()) && e.getTime() < olderThan) {
                    itr.remove();
                }
            }
        }
    }

    @Override
    public void onEvent(Event event) {
        if (excludedEvents == null || !excludedEvents.contains(event.getType())) {
            events.add(0, event);
        }
    }

    @Override
    public AdminEventQuery createAdminQuery() {
        return new MemAdminEventQuery(new LinkedList<>(adminEvents));
    }

    @Override
    public void clearAdmin() {

    }

    @Override
    public void clearAdmin(RealmModel realm) {
        synchronized(adminEvents) {
            Iterator<AdminEvent> itr = adminEvents.iterator();
            while (itr.hasNext()) {
                if (itr.next().getRealmId().equals(realm.getId())) {
                    itr.remove();
                }
            }
        }
    }

    @Override
    public void clearAdmin(RealmModel realm, long olderThan) {
        synchronized(adminEvents) {
            Iterator<AdminEvent> itr = adminEvents.iterator();
            while (itr.hasNext()) {
                AdminEvent e = itr.next();
                if (e.getRealmId().equals(realm.getId()) && e.getTime() < olderThan) {
                    itr.remove();
                }
            }
        }
    }

    @Override
    public void clearExpiredEvents() {
        session.realms().getRealmsStream().forEach(r -> {
            if (r.getEventsExpiration() > 0) {
                long olderThan = System.currentTimeMillis() - r.getEventsExpiration() * 1000;
                clear(r, olderThan);
            }
        });
    }

    @Override
    public void onEvent(AdminEvent adminEvent, boolean includeRepresentation) {
        if (excludedOperations == null || !excludedOperations.contains(adminEvent.getOperationType())) {
            adminEvents.add(0, adminEvent);
        }
    }

    @Override
    public void close() {
    }

}
