/*
 * Copyright 2013 Netflix, 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 feign;

import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;

import static feign.Util.checkNotNull;
import static feign.Util.valuesOrEmpty;

/**
 * An immutable request to an http server.
 * <br>
 * <br><br><b>Note</b><br>
 * <br>
 * Since {@link Feign} is designed for non-binary apis, and expectations are
 * that any request can be replayed, we only support a String body.
 */
public final class Request {

  private final String method;
  private final String url;
  private final Map<String, Collection<String>> headers;
  private final String body;

  Request(String method, String url, Map<String, Collection<String>> headers, String body) {
    this.method = checkNotNull(method, "method of %s", url);
    this.url = checkNotNull(url, "url");
    LinkedHashMap<String, Collection<String>> copyOf = new LinkedHashMap<String, Collection<String>>();
    copyOf.putAll(checkNotNull(headers, "headers of %s %s", method, url));
    this.headers = Collections.unmodifiableMap(copyOf);
    this.body = body; // nullable
  }

  /* Method to invoke on the server. */
  public String method() {
    return method;
  }

  /* Fully resolved URL including query. */
  public String url() {
    return url;
  }

  /* Ordered list of headers that will be sent to the server. */
  public Map<String, Collection<String>> headers() {
    return headers;
  }

  /* If present, this is the replayable body to send to the server. */
  public String body() {
    return body;
  }

  /* Controls the per-request settings currently required to be implemented by all {@link Client clients} */
  public static class Options {

    private final int connectTimeoutMillis;
    private final int readTimeoutMillis;

    public Options(int connectTimeoutMillis, int readTimeoutMillis) {
      this.connectTimeoutMillis = connectTimeoutMillis;
      this.readTimeoutMillis = readTimeoutMillis;
    }

    public Options() {
      this(10 * 1000, 60 * 1000);
    }

    /**
     * Defaults to 10 seconds. {@code 0} implies no timeout.
     *
     * @see java.net.HttpURLConnection#getConnectTimeout()
     */
    public int connectTimeoutMillis() {
      return connectTimeoutMillis;
    }

    /**
     * Defaults to 60 seconds. {@code 0} implies no timeout.
     *
     * @see java.net.HttpURLConnection#getReadTimeout()
     */
    public int readTimeoutMillis() {
      return readTimeoutMillis;
    }
  }

  @Override public String toString() {
    StringBuilder builder = new StringBuilder();
    builder.append(method).append(' ').append(url).append(" HTTP/1.1\n");
    for (String field : headers.keySet()) {
      for (String value : valuesOrEmpty(headers, field)) {
        builder.append(field).append(": ").append(value).append('\n');
      }
    }
    if (body != null) {
      builder.append('\n').append(body);
    }
    return builder.toString();
  }
}