/*
 * Copyright 2002-2016 the original author or authors.
 *
 * 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 org.springframework.http.server.reactive;

import java.io.ByteArrayInputStream;
import java.util.Arrays;
import java.util.Collections;
import javax.servlet.AsyncContext;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;

import org.junit.Test;

import org.springframework.core.io.buffer.DefaultDataBufferFactory;
import org.springframework.mock.web.test.DelegatingServletInputStream;
import org.springframework.mock.web.test.MockAsyncContext;
import org.springframework.mock.web.test.MockHttpServletRequest;
import org.springframework.mock.web.test.MockHttpServletResponse;
import org.springframework.util.MultiValueMap;

import static org.junit.Assert.assertEquals;

/**
 * Unit tests for {@link AbstractServerHttpRequest}.
 *
 * @author Rossen Stoyanchev
 */
public class ServerHttpRequestTests {


	@Test
	public void queryParamsNone() throws Exception {
		MultiValueMap<String, String> params = createHttpRequest("/path").getQueryParams();
		assertEquals(0, params.size());
	}

	@Test
	public void queryParams() throws Exception {
		MultiValueMap<String, String> params = createHttpRequest("/path?a=A&b=B").getQueryParams();
		assertEquals(2, params.size());
		assertEquals(Collections.singletonList("A"), params.get("a"));
		assertEquals(Collections.singletonList("B"), params.get("b"));
	}

	@Test
	public void queryParamsWithMulitpleValues() throws Exception {
		MultiValueMap<String, String> params = createHttpRequest("/path?a=1&a=2").getQueryParams();
		assertEquals(1, params.size());
		assertEquals(Arrays.asList("1", "2"), params.get("a"));
	}

	@Test // SPR-15140
	public void queryParamsWithEncodedValue() throws Exception {
		MultiValueMap<String, String> params = createHttpRequest("/path?a=%20%2B+%C3%A0").getQueryParams();
		assertEquals(1, params.size());
		assertEquals(Collections.singletonList(" ++\u00e0"), params.get("a"));
	}

	@Test
	public void queryParamsWithEmptyValue() throws Exception {
		MultiValueMap<String, String> params = createHttpRequest("/path?a=").getQueryParams();
		assertEquals(1, params.size());
		assertEquals(Collections.singletonList(""), params.get("a"));
	}

	@Test
	public void queryParamsWithNoValue() throws Exception {
		MultiValueMap<String, String> params = createHttpRequest("/path?a").getQueryParams();
		assertEquals(1, params.size());
		assertEquals(Collections.singletonList(null), params.get("a"));
	}

	private ServerHttpRequest createHttpRequest(String path) throws Exception {
		HttpServletRequest request = new MockHttpServletRequest("GET", path) {
			@Override
			public ServletInputStream getInputStream() {
				return new TestServletInputStream();
			}
		};
		AsyncContext asyncContext = new MockAsyncContext(request, new MockHttpServletResponse());
		return new ServletServerHttpRequest(request, asyncContext, new DefaultDataBufferFactory(), 1024);
	}

	private static class TestServletInputStream extends DelegatingServletInputStream {

		public TestServletInputStream() {
			super(new ByteArrayInputStream(new byte[0]));
		}

		@Override
		public void setReadListener(ReadListener readListener) {
			// Ignore
		}
	}
}
