/*
 * 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();
	}
}