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/*
 * Copyright (C) 2016 Square, Inc.
 *
 * 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 okhttp3.internal.platform;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.List;
import javax.annotation.Nullable;
import javax.net.ssl.SSLSocket;
import okhttp3.Protocol;
import okhttp3.internal.Util;

import static okhttp3.internal.Util.assertionError;

/**
 * OpenJDK 7 or OpenJDK 8 with {@code org.mortbay.jetty.alpn/alpn-boot} in the boot class path.
 */
class JdkWithJettyBootPlatform extends Platform {
  private final Method putMethod;
  private final Method getMethod;
  private final Method removeMethod;
  private final Class clientProviderClass;
  private final Class serverProviderClass;

  JdkWithJettyBootPlatform(Method putMethod, Method getMethod, Method removeMethod,
      Class clientProviderClass, Class serverProviderClass) {
    this.putMethod = putMethod;
    this.getMethod = getMethod;
    this.removeMethod = removeMethod;
    this.clientProviderClass = clientProviderClass;
    this.serverProviderClass = serverProviderClass;
  }

  @Override public void configureTlsExtensions(
      SSLSocket sslSocket, String hostname, List protocols) {
    List names = alpnProtocolNames(protocols);

    try {
      Object provider = Proxy.newProxyInstance(Platform.class.getClassLoader(),
          new Class[] {clientProviderClass, serverProviderClass}, new JettyNegoProvider(names));
      putMethod.invoke(null, sslSocket, provider);
    } catch (InvocationTargetException | IllegalAccessException e) {
      throw assertionError("unable to set alpn", e);
    }
  }

  @Override public void afterHandshake(SSLSocket sslSocket) {
    try {
      removeMethod.invoke(null, sslSocket);
    } catch (IllegalAccessException | InvocationTargetException e) {
      throw assertionError("unable to remove alpn", e);
    }
  }

  @Override public @Nullable String getSelectedProtocol(SSLSocket socket) {
    try {
      JettyNegoProvider provider =
          (JettyNegoProvider) Proxy.getInvocationHandler(getMethod.invoke(null, socket));
      if (!provider.unsupported && provider.selected == null) {
        Platform.get().log(INFO, "ALPN callback dropped: HTTP/2 is disabled. "
            + "Is alpn-boot on the boot class path?", null);
        return null;
      }
      return provider.unsupported ? null : provider.selected;
    } catch (InvocationTargetException | IllegalAccessException e) {
      throw assertionError("unable to get selected protocol", e);
    }
  }

  public static Platform buildIfSupported() {
    // Find Jetty's ALPN extension for OpenJDK.
    try {
      String negoClassName = "org.eclipse.jetty.alpn.ALPN";
      Class negoClass = Class.forName(negoClassName);
      Class providerClass = Class.forName(negoClassName + "$Provider");
      Class clientProviderClass = Class.forName(negoClassName + "$ClientProvider");
      Class serverProviderClass = Class.forName(negoClassName + "$ServerProvider");
      Method putMethod = negoClass.getMethod("put", SSLSocket.class, providerClass);
      Method getMethod = negoClass.getMethod("get", SSLSocket.class);
      Method removeMethod = negoClass.getMethod("remove", SSLSocket.class);
      return new JdkWithJettyBootPlatform(
          putMethod, getMethod, removeMethod, clientProviderClass, serverProviderClass);
    } catch (ClassNotFoundException | NoSuchMethodException ignored) {
    }

    return null;
  }

  /**
   * Handle the methods of ALPN's ClientProvider and ServerProvider without a compile-time
   * dependency on those interfaces.
   */
  private static class JettyNegoProvider implements InvocationHandler {
    /** This peer's supported protocols. */
    private final List protocols;
    /** Set when remote peer notifies ALPN is unsupported. */
    boolean unsupported;
    /** The protocol the server selected. */
    String selected;

    JettyNegoProvider(List protocols) {
      this.protocols = protocols;
    }

    @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
      String methodName = method.getName();
      Class returnType = method.getReturnType();
      if (args == null) {
        args = Util.EMPTY_STRING_ARRAY;
      }
      if (methodName.equals("supports") && boolean.class == returnType) {
        return true; // ALPN is supported.
      } else if (methodName.equals("unsupported") && void.class == returnType) {
        this.unsupported = true; // Peer doesn't support ALPN.
        return null;
      } else if (methodName.equals("protocols") && args.length == 0) {
        return protocols; // Client advertises these protocols.
      } else if ((methodName.equals("selectProtocol") || methodName.equals("select"))
          && String.class == returnType && args.length == 1 && args[0] instanceof List) {
        List peerProtocols = (List) args[0];
        // Pick the first known protocol the peer advertises.
        for (int i = 0, size = peerProtocols.size(); i < size; i++) {
          if (protocols.contains(peerProtocols.get(i))) {
            return selected = peerProtocols.get(i);
          }
        }
        return selected = protocols.get(0); // On no intersection, try peer's first protocol.
      } else if ((methodName.equals("protocolSelected") || methodName.equals("selected"))
          && args.length == 1) {
        this.selected = (String) args[0]; // Server selected this protocol.
        return null;
      } else {
        return method.invoke(this, args);
      }
    }
  }
}