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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;

import java.io.IOException;
import okio.Buffer;
import okio.BufferedSource;
import okio.ByteString;
import okio.Okio;
import okio.Source;
import okio.Timeout;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.junit.jupiter.api.Assertions.fail;

public final class ResponseTest {
  @Test public void peekShorterThanResponse() throws Exception {
    Response response = newResponse(responseBody("abcdef"));
    ResponseBody peekedBody = response.peekBody(3);
    assertThat(peekedBody.string()).isEqualTo("abc");
    assertThat(response.body().string()).isEqualTo("abcdef");
  }

  @Test public void peekLongerThanResponse() throws Exception {
    Response response = newResponse(responseBody("abc"));
    ResponseBody peekedBody = response.peekBody(6);
    assertThat(peekedBody.string()).isEqualTo("abc");
    assertThat(response.body().string()).isEqualTo("abc");
  }

  @Test public void peekAfterReadingResponse() throws Exception {
    Response response = newResponse(responseBody("abc"));
    assertThat(response.body().string()).isEqualTo("abc");

    try {
      response.peekBody(3);
      fail();
    } catch (IllegalStateException expected) {
    }
  }

  @Test public void eachPeakIsIndependent() throws Exception {
    Response response = newResponse(responseBody("abcdef"));
    ResponseBody p1 = response.peekBody(4);
    ResponseBody p2 = response.peekBody(2);
    assertThat(response.body().string()).isEqualTo("abcdef");
    assertThat(p1.string()).isEqualTo("abcd");
    assertThat(p2.string()).isEqualTo("ab");
  }

  @Test public void negativeStatusCodeThrowsIllegalStateException() {
    assertThatThrownBy(() -> newResponse(responseBody("set status code -1"), -1))
        .isInstanceOf(IllegalStateException.class);
  }

  @Test public void zeroStatusCodeIsValid() {
    Response response = newResponse(responseBody("set status code 0"), 0);
    assertThat(response.code()).isEqualTo(0);
  }

  @Test public void defaultResponseBodyIsEmpty() throws Exception {
    Response response = new Response.Builder()
      .request(new Request.Builder()
        .url("https://example.com/")
        .build())
      .protocol(Protocol.HTTP_1_1)
      .code(200)
      .message("OK")
      .build();
    assertThat(response.body().contentType()).isNull();
    assertThat(response.body().contentLength()).isEqualTo(0L);
    assertThat(response.body().byteString()).isEqualTo(ByteString.EMPTY);
  }

  @Test public void nullResponseBody() {
    assertThatThrownBy(() -> new Response.Builder().body(null))
      .isInstanceOf(NullPointerException.class);
  }

  /**
   * Returns a new response body that refuses to be read once it has been closed. This is true of
   * most {@link BufferedSource} instances, but not of {@link Buffer}.
   */
  private ResponseBody responseBody(String content) {
    final Buffer data = new Buffer().writeUtf8(content);

    Source source = new Source() {
      boolean closed;

      @Override public void close() throws IOException {
        closed = true;
      }

      @Override public long read(Buffer sink, long byteCount) throws IOException {
        if (closed) throw new IllegalStateException();
        return data.read(sink, byteCount);
      }

      @Override public Timeout timeout() {
        return Timeout.NONE;
      }
    };

    return ResponseBody.create(Okio.buffer(source), null, -1);
  }

  private Response newResponse(ResponseBody responseBody) {
    return newResponse(responseBody, 200);
  }

  private Response newResponse(ResponseBody responseBody, int code) {
    return new Response.Builder()
        .request(new Request.Builder()
            .url("https://example.com/")
            .build())
        .protocol(Protocol.HTTP_1_1)
        .code(code)
        .message("OK")
        .body(responseBody)
        .build();
  }
}