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/*
 * Copyright (C) 2015 Benjamin Bader
 *
 * 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.bendb.thrifty.testing;

import com.bendb.thrifty.test.gen.ThriftTest;
import org.apache.thrift.TProcessor;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TCompactProtocol;
import org.apache.thrift.protocol.TProtocolFactory;
import org.apache.thrift.server.TNonblockingServer;
import org.apache.thrift.server.TServer;
import org.apache.thrift.server.TSimpleServer;
import org.apache.thrift.server.TThreadPoolServer;
import org.apache.thrift.server.TThreadedSelectorServer;
import org.apache.thrift.transport.TNonblockingServerSocket;
import org.apache.thrift.transport.TNonblockingServerTransport;
import org.apache.thrift.transport.TServerSocket;
import org.apache.thrift.transport.TServerTransport;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;

import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.channels.ServerSocketChannel;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

public class TestServer implements TestRule {
    private final ServerProtocol protocol;
    private final ServerTransport transport;

    private TServerTransport serverTransport;
    private TServer server;
    private Thread serverThread;

    public void run() {
        ThriftTestHandler handler = new ThriftTestHandler(System.out);
        ThriftTest.Processor processor = new ThriftTest.Processor<>(handler);

        TProtocolFactory factory = getProtocolFactory();

        serverTransport = getServerTransport();
        server = startServer(processor, factory);

        final CountDownLatch latch = new CountDownLatch(1);
        serverThread = new Thread(new Runnable() {
            @Override
            public void run() {
                latch.countDown();
                server.serve();
            }
        });

        serverThread.start();

        try {
            latch.await(100, TimeUnit.MILLISECONDS);
        } catch (InterruptedException ignored) {
            // continue
        }
    }

    public TestServer() {
        this(ServerProtocol.BINARY, ServerTransport.BLOCKING);
    }

    public TestServer(ServerProtocol protocol, ServerTransport transport) {
        this.protocol = protocol;
        this.transport = transport;
    }

    public int port() {
        if (serverTransport instanceof TServerSocket) {
            return ((TServerSocket) serverTransport).getServerSocket().getLocalPort();
        } else if (serverTransport instanceof TNonblockingServerSocket) {
            TNonblockingServerSocket sock = (TNonblockingServerSocket) serverTransport;
            return sock.getPort();
        } else {
            throw new AssertionError("Unexpected server transport type: " + serverTransport.getClass());
        }
    }

    @Override
    public Statement apply(final Statement base, Description description) {
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                try {
                    run();
                    base.evaluate();
                } finally {
                    cleanupServer();
                }
            }
        };
    }

    private void cleanupServer() {
        if (serverTransport != null) {
            serverTransport.close();
            serverTransport = null;
        }

        if (server != null) {
            server.stop();
            server = null;
        }

        if (serverThread != null) {
            serverThread.interrupt();
            serverThread = null;
        }
    }

    private TServerTransport getServerTransport() {
        switch (transport) {
            case BLOCKING: return getBlockingServerTransport();
            case NON_BLOCKING: return getNonBlockingServerTransport();
            default:
                throw new AssertionError("Invalid transport type: " + transport);
        }
    }

    private TServerTransport getBlockingServerTransport() {
        try {
            InetAddress localhost = InetAddress.getByName("localhost");
            InetSocketAddress socketAddress = new InetSocketAddress(localhost, 0);
            TServerSocket.ServerSocketTransportArgs args = new TServerSocket.ServerSocketTransportArgs()
                    .bindAddr(socketAddress);

            return new TServerSocket(args);
        } catch (Exception e) {
            throw new AssertionError(e);
        }
    }

    private TServerTransport getNonBlockingServerTransport() {
        try {
            InetAddress localhost = InetAddress.getByName("localhost");
            InetSocketAddress socketAddress = new InetSocketAddress(localhost, 0);

            return new TNonblockingServerSocket(socketAddress);
        } catch (Exception e) {
            throw new AssertionError(e);
        }
    }

    private TProtocolFactory getProtocolFactory() {
        switch (protocol) {
            case BINARY: return new TBinaryProtocol.Factory();
            case COMPACT: return new TCompactProtocol.Factory();
            default:
                throw new AssertionError("Invalid protocol value: " + protocol);
        }
    }

    private TServer startServer(TProcessor processor, TProtocolFactory protocolFactory) {
        switch (transport) {
            case BLOCKING: return startBlockingServer(processor, protocolFactory);
            case NON_BLOCKING: return startNonblockingServer(processor, protocolFactory);
            default:
                throw new AssertionError("Invalid transport type: " + transport);
        }
    }

    private TServer startBlockingServer(TProcessor processor, TProtocolFactory protocolFactory) {
        TThreadPoolServer.Args args = new TThreadPoolServer.Args(serverTransport)
                .processor(processor)
                .protocolFactory(protocolFactory);

        return new TThreadPoolServer(args);
    }

    private TServer startNonblockingServer(TProcessor processor, TProtocolFactory protocolFactory) {
        TNonblockingServerTransport nonblockingTransport = (TNonblockingServerTransport) serverTransport;
        TNonblockingServer.Args args = new TNonblockingServer.Args(nonblockingTransport)
                .processor(processor)
                .protocolFactory(protocolFactory);

        return new TNonblockingServer(args);
    }
}