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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * 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.neo4j.driver.internal;

import static org.neo4j.driver.internal.Scheme.isHighTrustScheme;
import static org.neo4j.driver.internal.Scheme.isSecurityScheme;
import static org.neo4j.driver.internal.security.SecurityPlanImpl.insecure;

import java.io.IOException;
import java.io.Serializable;
import java.security.GeneralSecurityException;
import org.neo4j.driver.Config;
import org.neo4j.driver.RevocationCheckingStrategy;
import org.neo4j.driver.exceptions.ClientException;
import org.neo4j.driver.internal.security.SecurityPlan;
import org.neo4j.driver.internal.security.SecurityPlanImpl;

public class SecuritySettings implements Serializable {
    private static final long serialVersionUID = 4494615367164106576L;

    private static final boolean DEFAULT_ENCRYPTED = false;
    private static final Config.TrustStrategy DEFAULT_TRUST_STRATEGY = Config.TrustStrategy.trustSystemCertificates();
    private static final SecuritySettings DEFAULT = new SecuritySettings(DEFAULT_ENCRYPTED, DEFAULT_TRUST_STRATEGY);
    private final boolean encrypted;
    private final Config.TrustStrategy trustStrategy;

    public SecuritySettings(boolean encrypted, Config.TrustStrategy trustStrategy) {
        this.encrypted = encrypted;
        this.trustStrategy = trustStrategy == null ? DEFAULT_TRUST_STRATEGY : trustStrategy;
    }

    public boolean encrypted() {
        return encrypted;
    }

    public Config.TrustStrategy trustStrategy() {
        return trustStrategy;
    }

    private boolean isCustomized() {
        return !(DEFAULT.encrypted() == this.encrypted() && DEFAULT.hasEqualTrustStrategy(this));
    }

    private boolean hasEqualTrustStrategy(SecuritySettings other) {
        Config.TrustStrategy t1 = this.trustStrategy;
        Config.TrustStrategy t2 = other.trustStrategy;
        if (t1 == t2) {
            return true;
        }

        return t1.isHostnameVerificationEnabled() == t2.isHostnameVerificationEnabled()
                && t1.strategy() == t2.strategy()
                && t1.certFiles().equals(t2.certFiles())
                && t1.revocationCheckingStrategy() == t2.revocationCheckingStrategy();
    }

    public SecurityPlan createSecurityPlan(String uriScheme) {
        Scheme.validateScheme(uriScheme);
        try {
            if (isSecurityScheme(uriScheme)) {
                assertSecuritySettingsNotUserConfigured(uriScheme);
                return createSecurityPlanFromScheme(uriScheme);
            } else {
                return createSecurityPlanImpl(encrypted, trustStrategy);
            }
        } catch (GeneralSecurityException | IOException ex) {
            throw new ClientException("Unable to establish SSL parameters", ex);
        }
    }

    private void assertSecuritySettingsNotUserConfigured(String uriScheme) {
        if (isCustomized()) {
            throw new ClientException(String.format(
                    "Scheme %s is not configurable with manual encryption and trust settings", uriScheme));
        }
    }

    private SecurityPlan createSecurityPlanFromScheme(String scheme) throws GeneralSecurityException, IOException {
        if (isHighTrustScheme(scheme)) {
            return SecurityPlanImpl.forSystemCASignedCertificates(true, RevocationCheckingStrategy.NO_CHECKS);
        } else {
            return SecurityPlanImpl.forAllCertificates(false, RevocationCheckingStrategy.NO_CHECKS);
        }
    }

    /*
     * Establish a complete SecurityPlan based on the details provided for
     * driver construction.
     */
    private static SecurityPlan createSecurityPlanImpl(boolean encrypted, Config.TrustStrategy trustStrategy)
            throws GeneralSecurityException, IOException {
        if (encrypted) {
            boolean hostnameVerificationEnabled = trustStrategy.isHostnameVerificationEnabled();
            RevocationCheckingStrategy revocationCheckingStrategy = trustStrategy.revocationCheckingStrategy();
            switch (trustStrategy.strategy()) {
                case TRUST_CUSTOM_CA_SIGNED_CERTIFICATES:
                    return SecurityPlanImpl.forCustomCASignedCertificates(
                            trustStrategy.certFiles(), hostnameVerificationEnabled, revocationCheckingStrategy);
                case TRUST_SYSTEM_CA_SIGNED_CERTIFICATES:
                    return SecurityPlanImpl.forSystemCASignedCertificates(
                            hostnameVerificationEnabled, revocationCheckingStrategy);
                case TRUST_ALL_CERTIFICATES:
                    return SecurityPlanImpl.forAllCertificates(hostnameVerificationEnabled, revocationCheckingStrategy);
                default:
                    throw new ClientException("Unknown TLS authentication strategy: "
                            + trustStrategy.strategy().name());
            }
        } else {
            return insecure();
        }
    }

    public static class SecuritySettingsBuilder {
        private boolean isCustomized = false;
        private boolean encrypted;
        private Config.TrustStrategy trustStrategy;

        public SecuritySettingsBuilder withEncryption() {
            encrypted = true;
            isCustomized = true;
            return this;
        }

        public SecuritySettingsBuilder withoutEncryption() {
            encrypted = false;
            isCustomized = true;
            return this;
        }

        public SecuritySettingsBuilder withTrustStrategy(Config.TrustStrategy strategy) {
            trustStrategy = strategy;
            isCustomized = true;
            return this;
        }

        public SecuritySettings build() {
            return isCustomized ? new SecuritySettings(encrypted, trustStrategy) : SecuritySettings.DEFAULT;
        }
    }
}