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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you 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.openqa.grid.web.servlet.handler;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.common.io.ByteStreams;

import org.openqa.grid.common.exception.GridException;
import org.openqa.grid.internal.ExternalSessionKey;
import org.openqa.grid.internal.GridRegistry;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

/**
 * wrapper around a selenium http request that helps accessing the internal
 * details that are selenium related ( type of protocol, new session request
 * etc ) Also allows to change the content of the request, or read it
 * on the hub.
 *
 */
public abstract class SeleniumBasedRequest extends HttpServletRequestWrapper {

  private byte[] body;
  private final GridRegistry registry;
  private final RequestType type;
  private final String encoding = "UTF-8";
  private final Map desiredCapability;
  private final long timestamp = System.currentTimeMillis();

  private static List requestFactories =
    new ImmutableList.Builder()
      .add(new WebDriverRequestFactory())
      .add(new LegacySeleniumRequestFactory())
      .build();

  public static SeleniumBasedRequest createFromRequest(HttpServletRequest request, GridRegistry registry) {
    for (SeleniumBasedRequestFactory factory : requestFactories) {
      SeleniumBasedRequest sbr = factory.createFromRequest(request, registry);
      if (sbr != null) {
        return sbr;
      }
    }
    throw new GridException("Request path " + request.getServletPath() + " is not recognized");
  }

  @VisibleForTesting
  public SeleniumBasedRequest(HttpServletRequest request, GridRegistry registry, RequestType type,
                              Map desiredCapability) {
    super(request);
    this.registry = registry;
    this.type = type;
    this.desiredCapability = desiredCapability;
  }

  public SeleniumBasedRequest(HttpServletRequest httpServletRequest, GridRegistry registry) {
    super(httpServletRequest);
    try {
      InputStream is = super.getInputStream();
      setBody(ByteStreams.toByteArray(is));
    } catch (IOException ex) {
      throw new RuntimeException(ex);
    }
    this.registry = registry;
    type = extractRequestType();

    if (type == RequestType.START_SESSION) {
      desiredCapability = extractDesiredCapability();
    } else {
      desiredCapability = null;
    }
  }

  public GridRegistry getRegistry() {
    return registry;
  }

  /**
   * @return the type of the request.
   */
  public abstract RequestType extractRequestType();

  /**
   * Extract the session from the request. This only works for a request that has a session already
   * assigned. It shouldn't be called for a new session request.
   *
   * @return the external session id sent by the remote. Null is the session cannot be found.
   */
  public abstract ExternalSessionKey extractSession();

  /**
   * Parse the request to extract the desiredCapabilities. For non web driver protocol ( selenium1 )
   * some mapping will be necessary
   *
   * @return the desired capabilities requested by the client.
   */
  public abstract Map extractDesiredCapability();

  public RequestType getRequestType() {
    return type;
  }

  @Override
  public ServletInputStream getInputStream() throws IOException {
    setBody(getBody());
    return new ServletInputStreamImpl(new ByteArrayInputStream(body));
  }

  @Override
  public BufferedReader getReader() throws IOException {
    return new BufferedReader(new InputStreamReader(getInputStream(), encoding));
  }

  @Override
  public int getContentLength() {
    if (body == null) {
      return 0;
    }
    return body.length;
  }

  public String getBody() {
    try {
      Charset charset = Charset.forName(encoding);
      CharsetDecoder decoder = charset.newDecoder();
      CharBuffer cbuf = decoder.decode(ByteBuffer.wrap(body));
      return cbuf.toString();
    } catch (CharacterCodingException e) {
      e.printStackTrace();
    }
    return null;
  }

  public void setBody(String content) throws UnsupportedEncodingException {
    setBody(content.getBytes(encoding));
  }

  public void setBody(byte[] content) {
    body = content;
    setAttribute("Content-Length", content.length);
  }

  public long getCreationTime() {
    return timestamp;
  }

  public String toString() {
    SimpleDateFormat format = new SimpleDateFormat("d MMM yyyy HH:mm:ss");
    StringBuilder builder = new StringBuilder();
    builder.append("["+format.format(new Date(timestamp))+"] ");
    builder.append(getMethod().toUpperCase() +" "+getPathInfo()+"   ");
    if (getBody() != null && !getBody().isEmpty()) {
      builder.append(getBody());
    }
    return builder.toString();
  }

  public Map getDesiredCapabilities() {
    return desiredCapability;
  }

  private class ServletInputStreamImpl extends ServletInputStream {

    private InputStream is;

    public ServletInputStreamImpl(InputStream is) {
      this.is = is;
    }

    public int read() throws IOException {
      return is.read();
    }

    public boolean markSupported() {
      return false;
    }

    public synchronized void mark(int i) {
      throw new RuntimeException("not implemented");
    }

    public synchronized void reset() throws IOException {
      throw new RuntimeException("not implemented");
    }

    public boolean isFinished() {
      return false;
    }

    public boolean isReady() {
      return true;
    }

    public void setReadListener(ReadListener readListener) {
      throw new RuntimeException("setReadListener");
    }
  }
}