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// Copyright 2015-2019 SWIM.AI 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 swim.http;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import swim.codec.Binary;
import swim.codec.Debug;
import swim.codec.Decoder;
import swim.codec.Encoder;
import swim.codec.Format;
import swim.codec.InputBuffer;
import swim.codec.Output;
import swim.codec.OutputBuffer;
import swim.codec.Utf8;
import swim.collections.FingerTrieSeq;
import swim.http.header.ContentLength;
import swim.http.header.ContentType;
import swim.util.Murmur3;

public final class HttpBody extends HttpEntity implements Debug {
  final T value;
  final Encoder content;
  final long length;
  final MediaType mediaType;

  HttpBody(T value, Encoder content, long length, MediaType mediaType) {
    this.value = value;
    this.content = content;
    this.length = length;
    this.mediaType = mediaType;
  }

  @Override
  public boolean isDefined() {
    return this.value != null;
  }

  @Override
  public T get() {
    return this.value;
  }

  public Encoder content() {
    return this.content;
  }

  @Override
  public long length() {
    return this.length;
  }

  @Override
  public MediaType mediaType() {
    return this.mediaType;
  }

  @Override
  public FingerTrieSeq transferCodings() {
    return FingerTrieSeq.empty();
  }

  @Override
  public FingerTrieSeq headers() {
    FingerTrieSeq headers = FingerTrieSeq.empty();
    if (this.mediaType != null) {
      headers = headers.appended(ContentType.from(this.mediaType));
    }
    headers = headers.appended(ContentLength.from(this.length));
    return headers;
  }

  @Override
  public  Encoder> httpEncoder(HttpMessage message, HttpWriter http) {
    return http.bodyEncoder(message, this.content, this.length);
  }

  @Override
  public  Encoder> encodeHttp(HttpMessage message,
                                                     OutputBuffer output, HttpWriter http) {
    return http.encodeBody(message, this.content, this.length, output);
  }

  @Override
  public boolean equals(Object other) {
    if (this == other) {
      return true;
    } else if (other instanceof HttpBody) {
      final HttpBody that = (HttpBody) other;
      return (this.value == null ? that.value == null : this.value.equals(that.value))
          && this.content.equals(that.content) && this.length == that.length
          && (this.mediaType == null ? that.mediaType == null : this.mediaType.equals(that.mediaType));
    }
    return false;
  }

  @Override
  public int hashCode() {
    if (hashSeed == 0) {
      hashSeed = Murmur3.seed(HttpBody.class);
    }
    return Murmur3.mash(Murmur3.mix(Murmur3.mix(Murmur3.mix(Murmur3.mix(
        hashSeed, Murmur3.hash(this.value)), this.content.hashCode()),
        Murmur3.hash(this.length)), Murmur3.hash(this.mediaType)));
  }

  @Override
  public void debug(Output output) {
    output = output.write("HttpBody").write('.').write("from").write('(');
    if (this.value != null) {
      output.debug(this.value).write(", ");
    }
    output.debug(this.content).write(", ").debug(this.length);
    if (this.mediaType != null) {
      output = output.write(", ").debug(this.mediaType);
    }
    output = output.write(')');
  }

  @Override
  public String toString() {
    return Format.debug(this);
  }

  private static int hashSeed;

  private static HttpBody