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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.security;

import com.google.common.collect.ImmutableMap;
import org.apache.shiro.authz.Permission;
import org.apache.shiro.authz.permission.AllPermission;
import org.apache.shiro.authz.permission.RolePermissionResolver;
import org.graylog.security.permissions.CaseSensitiveWildcardPermission;
import org.graylog2.shared.users.Role;
import org.graylog2.users.RoleService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nonnull;
import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import java.util.stream.Collectors;

@Singleton
public class InMemoryRolePermissionResolver implements RolePermissionResolver {
    private static final Logger log = LoggerFactory.getLogger(InMemoryRolePermissionResolver.class);

    private final RoleService roleService;
    private final AtomicReference> idToRoleIndex = new AtomicReference<>(ImmutableMap.of());

    @Inject
    public InMemoryRolePermissionResolver(RoleService roleService,
                                          @Named("daemonScheduler") ScheduledExecutorService daemonScheduler) {
        this.roleService = roleService;
        final RoleUpdater updater = new RoleUpdater();

        // eagerly load rules
        updater.run();

        // update rules every second in the background
        daemonScheduler.scheduleAtFixedRate(updater, 1, 1, TimeUnit.SECONDS);
    }

    @Override
    public Collection resolvePermissionsInRole(String roleId) {
        final Set permissions = resolveStringPermission(roleId);

        return permissions.stream().map(p -> {
            if (p.equals("*")) {
                return new AllPermission();
            } else {
                return new CaseSensitiveWildcardPermission(p);
            }
        }).collect(Collectors.toList());
    }

    @Nonnull
    public Set resolveStringPermission(String roleId) {
        final ImmutableMap index = idToRoleIndex.get();

        final Role role = index.get(roleId);
        if (role == null) {
            log.debug("Unknown role {}, cannot resolve permissions.", roleId);
            return Collections.emptySet();
        }

        final Set permissions = role.getPermissions();
        if (permissions == null) {
            log.debug("Role {} has no permissions assigned, cannot resolve permissions.", roleId);
            return Collections.emptySet();
        }
        return permissions;
    }


    private class RoleUpdater implements Runnable {
        @Override
        public void run() {
            try {
                final Map index = roleService.loadAllIdMap();
                InMemoryRolePermissionResolver.this.idToRoleIndex.set(ImmutableMap.copyOf(index));
            } catch (Exception e) {
                log.error("Could not find roles collection, no user roles updated.", e);
            }
        }
    }
}