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/*
 * 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 com.facebook.presto.cli;

import com.facebook.presto.client.ClientSession;
import com.facebook.presto.client.SocketChannelSocketFactory;
import com.facebook.presto.client.StatementClient;
import com.google.common.net.HostAndPort;
import okhttp3.OkHttpClient;

import java.io.Closeable;
import java.io.File;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Consumer;

import static com.facebook.presto.client.ClientSession.stripTransactionId;
import static com.facebook.presto.client.OkHttpUtil.basicAuth;
import static com.facebook.presto.client.OkHttpUtil.setupCookieJar;
import static com.facebook.presto.client.OkHttpUtil.setupHttpProxy;
import static com.facebook.presto.client.OkHttpUtil.setupKerberos;
import static com.facebook.presto.client.OkHttpUtil.setupSocksProxy;
import static com.facebook.presto.client.OkHttpUtil.setupSsl;
import static com.facebook.presto.client.OkHttpUtil.setupTimeouts;
import static com.facebook.presto.client.OkHttpUtil.tokenAuth;
import static com.facebook.presto.client.StatementClientFactory.newStatementClient;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
import static java.util.concurrent.TimeUnit.SECONDS;

public class QueryRunner
        implements Closeable
{
    private final AtomicReference session;
    private final boolean debug;
    private final OkHttpClient httpClient;
    private final Consumer sslSetup;

    public QueryRunner(
            ClientSession session,
            boolean debug,
            Optional socksProxy,
            Optional httpProxy,
            Optional keystorePath,
            Optional keystorePassword,
            Optional truststorePath,
            Optional truststorePassword,
            Optional accessToken,
            Optional user,
            Optional password,
            Optional kerberosPrincipal,
            Optional kerberosRemoteServiceName,
            Optional kerberosConfigPath,
            Optional kerberosKeytabPath,
            Optional kerberosCredentialCachePath,
            boolean kerberosUseCanonicalHostname)
    {
        this.session = new AtomicReference<>(requireNonNull(session, "session is null"));
        this.debug = debug;

        this.sslSetup = builder -> setupSsl(builder, keystorePath, keystorePassword, truststorePath, truststorePassword);

        OkHttpClient.Builder builder = new OkHttpClient.Builder();

        builder.socketFactory(new SocketChannelSocketFactory());

        setupTimeouts(builder, 30, SECONDS);
        setupCookieJar(builder);
        setupSocksProxy(builder, socksProxy);
        setupHttpProxy(builder, httpProxy);
        setupBasicAuth(builder, session, user, password);
        setupTokenAuth(builder, session, accessToken);

        if (kerberosRemoteServiceName.isPresent()) {
            checkArgument(session.getServer().getScheme().equalsIgnoreCase("https"),
                    "Authentication using Kerberos requires HTTPS to be enabled");
            setupKerberos(
                    builder,
                    kerberosRemoteServiceName.get(),
                    kerberosUseCanonicalHostname,
                    kerberosPrincipal,
                    kerberosConfigPath.map(File::new),
                    kerberosKeytabPath.map(File::new),
                    kerberosCredentialCachePath.map(File::new));
        }

        this.httpClient = builder.build();
    }

    public ClientSession getSession()
    {
        return session.get();
    }

    public void setSession(ClientSession session)
    {
        this.session.set(requireNonNull(session, "session is null"));
    }

    public boolean isDebug()
    {
        return debug;
    }

    public Query startQuery(String query)
    {
        return new Query(startInternalQuery(session.get(), query), debug);
    }

    public StatementClient startInternalQuery(String query)
    {
        return startInternalQuery(stripTransactionId(session.get()), query);
    }

    private StatementClient startInternalQuery(ClientSession session, String query)
    {
        OkHttpClient.Builder builder = httpClient.newBuilder();
        sslSetup.accept(builder);
        OkHttpClient client = builder.build();

        return newStatementClient(client, session, query);
    }

    @Override
    public void close()
    {
        httpClient.dispatcher().executorService().shutdown();
        httpClient.connectionPool().evictAll();
    }

    private static void setupBasicAuth(
            OkHttpClient.Builder clientBuilder,
            ClientSession session,
            Optional user,
            Optional password)
    {
        if (user.isPresent() && password.isPresent()) {
            checkArgument(session.getServer().getScheme().equalsIgnoreCase("https"),
                    "Authentication using username/password requires HTTPS to be enabled");
            clientBuilder.addInterceptor(basicAuth(user.get(), password.get()));
        }
    }

    private static void setupTokenAuth(
            OkHttpClient.Builder clientBuilder,
            ClientSession session,
            Optional accessToken)
    {
        if (accessToken.isPresent()) {
            checkArgument(session.getServer().getScheme().equalsIgnoreCase("https"),
                    "Authentication using an access token requires HTTPS to be enabled");
            clientBuilder.addInterceptor(tokenAuth(accessToken.get()));
        }
    }
}