/*
    * Copyright (C) 2010, Google Inc. and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  
  package org.eclipse.jgit.junit.http;
  
  import java.util.Collections;
  import java.util.Enumeration;
  import java.util.Map;
  import java.util.TreeMap;
  
  import org.eclipse.jetty.server.Request;
  import org.eclipse.jetty.server.Response;
  
  /**
   * A single request made through {@link org.eclipse.jgit.junit.http.AppServer}.
   */
  public class AccessEvent {
  	private final String method;
  
  	private final String uri;
  
  	private final Map<String, String> requestHeaders;
  
  	private final Map<String, String[]> parameters;
  
  	private final int status;
  
  	private final Map<String, String> responseHeaders;
  
  	AccessEvent(Request req, Response rsp) {
  		method = req.getMethod();
  		uri = req.getRequestURI();
  		requestHeaders = cloneHeaders(req);
  		parameters = clone(req.getParameterMap());
  
  		status = rsp.getStatus();
  		responseHeaders = cloneHeaders(rsp);
  	}
  
  	private static Map<String, String> cloneHeaders(Request req) {
  		Map<String, String> r = new TreeMap<>();
  		Enumeration hn = req.getHeaderNames();
  		while (hn.hasMoreElements()) {
  			String key = (String) hn.nextElement();
  			if (!r.containsKey(key)) {
  				r.put(key, req.getHeader(key));
  			}
  		}
  		return Collections.unmodifiableMap(r);
  	}
  
  	private static Map<String, String> cloneHeaders(Response rsp) {
  		Map<String, String> r = new TreeMap<>();
  		Enumeration<String> hn = rsp.getHttpFields().getFieldNames();
  		while (hn.hasMoreElements()) {
  			String key = hn.nextElement();
  			if (!r.containsKey(key)) {
  				Enumeration<String> v = rsp.getHttpFields().getValues(key);
  				r.put(key, v.nextElement());
  			}
  		}
  		return Collections.unmodifiableMap(r);
  	}
  
  	@SuppressWarnings("unchecked")
  	private static Map<String, String[]> clone(Map parameterMap) {
  		return new TreeMap<>(parameterMap);
  	}
  
  	/**
  	 * Get the <code>method</code>.
  	 *
  	 * @return {@code "GET"} or {@code "POST"}
  	 */
  	public String getMethod() {
  		return method;
  	}
  
  	/**
  	 * Get <code>path</code>.
  	 *
  	 * @return path of the file on the server, e.g. {@code /git/HEAD}.
  	 */
  	public String getPath() {
  		return uri;
  	}
  
  	/**
  	 * Get request header
  	 *
  	 * @param name
  	 *            name of the request header to read.
 	 * @return first value of the request header; null if not sent.
 	 */
 	public String getRequestHeader(String name) {
 		return requestHeaders.get(name);
 	}
 
 	/**
 	 * Get parameter
 	 *
 	 * @param name
 	 *            name of the request parameter to read.
 	 * @return first value of the request parameter; null if not sent.
 	 */
 	public String getParameter(String name) {
 		String[] r = parameters.get(name);
 		return r != null && 1 <= r.length ? r[0] : null;
 	}
 
 	/**
 	 * Get <code>parameters</code>
 	 *
 	 * @return all parameters in the request.
 	 */
 	public Map<String, String[]> getParameters() {
 		return parameters;
 	}
 
 	/**
 	 * Get the <code>status</code>.
 	 *
 	 * @return HTTP status code of the response, e.g. 200, 403, 500.
 	 */
 	public int getStatus() {
 		return status;
 	}
 
 	/**
 	 * Get response header.
 	 *
 	 * @param name
 	 *            name of the response header to read.
 	 * @return first value of the response header; null if not sent.
 	 */
 	public String getResponseHeader(String name) {
 		return responseHeaders.get(name);
 	}
 
 	/** {@inheritDoc} */
 	@Override
 	public String toString() {
 		StringBuilder b = new StringBuilder();
 		b.append(method);
 		b.append(' ');
 		b.append(uri);
 		if (!parameters.isEmpty()) {
 			b.append('?');
 			boolean first = true;
 			for (Map.Entry<String, String[]> e : parameters.entrySet()) {
 				for (String val : e.getValue()) {
 					if (!first) {
 						b.append('&');
 					}
 					first = false;
 
 					b.append(e.getKey());
 					b.append('=');
 					b.append(val);
 				}
 			}
 		}
 		b.append(' ');
 		b.append(status);
 		return b.toString();
 	}
 }