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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.solr.client.solrj.request;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.atomic.AtomicLong;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.solr.client.solrj.SolrClient;
import org.apache.solr.client.solrj.SolrRequest;
import org.apache.solr.client.solrj.response.V2Response;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.ContentStream;
import org.apache.solr.common.util.ContentStreamBase;
import org.apache.solr.common.util.Utils;

public class V2Request extends SolrRequest {
  //only for debugging purposes
  public static final ThreadLocal v2Calls = new ThreadLocal<>();
  static final Pattern COLL_REQ_PATTERN = Pattern.compile("/(c|collections)/([^/])+/(?!shards)");
  private InputStream payload;
  private SolrParams solrParams;
  public final boolean useBinary;
  private String collection;
  private boolean isPerCollectionRequest = false;

  private V2Request(METHOD m, String resource, boolean useBinary) {
    super(m, resource);
    Matcher matcher = COLL_REQ_PATTERN.matcher(getPath());
    if (matcher.find()) {
      this.collection = matcher.group(2);
      isPerCollectionRequest = true;
    }
    this.useBinary = useBinary;

  }

  @Override
  public SolrParams getParams() {
    return solrParams;
  }

  @Override
  public Collection getContentStreams() throws IOException {
    if (v2Calls.get() != null) v2Calls.get().incrementAndGet();
    if (payload != null) {
      return Collections.singleton(new ContentStreamBase() {
        @Override
        public InputStream getStream() throws IOException {
          return payload;
        }

        @Override
        public String getContentType() {
          return useBinary ? "application/javabin" : "application/json";
        }
      });
    }
    return null;
  }

  public boolean isPerCollectionRequest() {
    return isPerCollectionRequest;
  }

  @Override
  public String getCollection() {
    return collection;
  }

  @Override
  protected V2Response createResponse(SolrClient client) {
    return new V2Response();
  }

  public static class Builder {
    private String resource;
    private METHOD method = METHOD.GET;
    private Object payload;
    private SolrParams params;
    private boolean useBinary = false;

    /**
     * Create a Builder object based on the provided resource.
     * The default method is GET.
     *
     * @param resource resource of the request for example "/collections" or "/cores/core-name"
     */
    public Builder(String resource) {
      if (!resource.startsWith("/")) resource = "/" + resource;
      this.resource = resource;
    }

    public Builder withMethod(METHOD m) {
      this.method = m;
      return this;
    }

    /**
     * Set payload for request.
     * @param payload as UTF-8 String
     * @return builder object
     */
    public Builder withPayload(String payload) {
      if (payload != null) {
        this.payload = new ByteArrayInputStream(payload.getBytes(StandardCharsets.UTF_8));
      }
      return this;
    }

    public Builder withPayload(Object payload) {
      this.payload = payload;
      return this;
    }

    public Builder withPayload(InputStream payload) {
      this.payload = payload;
      return this;
    }

    public Builder withParams(SolrParams params) {
      this.params = params;
      return this;
    }

    public Builder useBinary(boolean flag) {
      this.useBinary = flag;
      return this;
    }

    public V2Request build() {
      try {
        V2Request v2Request = new V2Request(method, resource, useBinary);
        v2Request.solrParams = params;
        InputStream is = null;
        if (payload != null) {
          if (payload instanceof InputStream) is = (InputStream) payload;
          else if (useBinary) is = Utils.toJavabin(payload);
          else is = new ByteArrayInputStream(Utils.toJSON(payload));
        }
        v2Request.payload = is;
        return v2Request;
      } catch (IOException e) {
        throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
      }


    }
  }
}